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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Pocket Video Trimmer</title>
<style>
  :root{
    --bg:#0e1116; --panel:#161b22; --panel2:#1c232d; --line:#2a323d;
    --txt:#e6edf3; --dim:#8b98a5; --accent:#4cc2ff; --accent2:#2a9fd6;
    --ok:#3fb950; --warn:#d29922; --danger:#f85149;
    --r:10px;
  }
  *{box-sizing:border-box}
  html,body{margin:0;height:100%}
  body{
    background:var(--bg); color:var(--txt);
    font:14px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    -webkit-font-smoothing:antialiased;
  }
  .wrap{max-width:1180px;margin:0 auto;padding:20px 20px 60px}
  header{display:flex;align-items:center;gap:12px;margin-bottom:18px}
  header h1{font-size:17px;margin:0;font-weight:600;letter-spacing:.2px}
  header .sub{color:var(--dim);font-size:12.5px}
  header .verwrap{display:flex;flex-direction:column;align-items:center;gap:3px}
  header .ver{color:var(--dim);font-size:12px;font-variant-numeric:tabular-nums;
    border:1px solid var(--line);border-radius:99px;padding:3px 10px;background:var(--panel)}
  header .by{color:var(--dim);font-size:10px;letter-spacing:.3px;opacity:.8}
  .spacer{flex:1}

  button{
    font:inherit;color:var(--txt);background:var(--panel2);border:1px solid var(--line);
    padding:7px 13px;border-radius:8px;cursor:pointer;transition:.12s;
  }
  button:hover:not(:disabled){background:#242d39;border-color:#3a4553}
  button:disabled{opacity:.4;cursor:not-allowed}
  button.primary{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
  button.primary:hover:not(:disabled){background:#6bcfff}
  button.ghost{background:transparent}
  button.danger{color:#ffb4ae;border-color:#5a2b2b}
  button.danger:hover:not(:disabled){background:#341c1c;border-color:#7a3a3a}
  .icobtn{padding:7px 11px;font-variant-numeric:tabular-nums}
  .small{padding:5px 10px;font-size:12.5px}

  /* ---------- drop zone ---------- */
  #drop{
    border:2px dashed var(--line);border-radius:14px;padding:64px 24px;text-align:center;
    background:var(--panel);cursor:pointer;transition:.15s;
  }
  #drop:hover,#drop.over{border-color:var(--accent);background:#12212b}
  #drop h2{margin:0 0 6px;font-size:18px;font-weight:600}
  #drop p{margin:0;color:var(--dim);font-size:13px}
  #drop .big{font-size:38px;line-height:1;margin-bottom:14px;opacity:.65}

  /* ---------- layout ---------- */
  #app{display:none}
  .grid{display:grid;grid-template-columns:1fr 316px;gap:18px;align-items:start}
  @media(max-width:900px){.grid{grid-template-columns:1fr}}

  .card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:14px}
  .card h3{margin:0 0 12px;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim);font-weight:600}
  .panelbox{background:#11161d;border:1px solid var(--line);border-radius:10px;
    padding:10px 12px 4px;margin-bottom:14px}
  h3.collap{display:flex;align-items:center;justify-content:space-between;cursor:pointer;user-select:none;
    margin:-10px -12px 10px;padding:9px 12px;border-radius:9px 9px 0 0;background:#171d26;
    border-bottom:1px solid var(--line);color:var(--txt)}
  h3.collap:hover{background:#1c232d}
  h3.collap.shut{margin-bottom:-4px;border-bottom:none;border-radius:9px}
  h3.collap .chev{font-size:11px;color:var(--accent);transition:transform .15s;transform:rotate(0deg)}
  h3.collap.shut .chev{transform:rotate(-90deg)}

  .stage{background:#000;border-radius:var(--r);overflow:hidden;display:flex;align-items:center;justify-content:center;position:relative;border:1px solid var(--line)}
  .stage video,.stage canvas{max-width:100%;max-height:56vh;display:block}
  #exportCanvas{display:none}
  .badge{position:absolute;top:10px;left:10px;z-index:3;background:rgba(0,0,0,.66);backdrop-filter:blur(4px);
    padding:4px 9px;border-radius:6px;font-size:11.5px;color:#cfe;letter-spacing:.3px}

  /* ---------- crop overlay ---------- */
  #cropLayer{position:absolute;display:none;touch-action:none;z-index:2}
  #cropBox{position:absolute;box-shadow:0 0 0 9999px rgba(4,7,11,.62);
    border:1px solid rgba(255,255,255,.92);cursor:move;box-sizing:border-box}
  #cropBox::after{content:"";position:absolute;inset:0;pointer-events:none;
    background:
      linear-gradient(to right,transparent calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% + 0.5px),transparent calc(33.33% + 0.5px),transparent calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% + 0.5px),transparent calc(66.66% + 0.5px)),
      linear-gradient(to bottom,transparent calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% + 0.5px),transparent calc(33.33% + 0.5px),transparent calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% + 0.5px),transparent calc(66.66% + 0.5px));}
  .ch{position:absolute;width:16px;height:16px;background:#fff;border:1px solid rgba(0,0,0,.65);border-radius:3px;z-index:2}
  .ch:hover{background:var(--accent)}
  .ch[data-h=nw]{left:-8px;top:-8px;cursor:nwse-resize}
  .ch[data-h=ne]{right:-8px;top:-8px;cursor:nesw-resize}
  .ch[data-h=sw]{left:-8px;bottom:-8px;cursor:nesw-resize}
  .ch[data-h=se]{right:-8px;bottom:-8px;cursor:nwse-resize}
  .ch[data-h=n]{left:calc(50% - 8px);top:-8px;cursor:ns-resize}
  .ch[data-h=s]{left:calc(50% - 8px);bottom:-8px;cursor:ns-resize}
  .ch[data-h=w]{left:-8px;top:calc(50% - 8px);cursor:ew-resize}
  .ch[data-h=e]{right:-8px;top:calc(50% - 8px);cursor:ew-resize}
  .cropdims{position:absolute;left:50%;transform:translateX(-50%);bottom:5px;
    background:rgba(0,0,0,.75);color:#dff;padding:2px 8px;border-radius:5px;
    font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap;pointer-events:none}

  #cropBtn.on{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
  #cropBtn.on .kbd{background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25);color:#04121c}
  .arlab{color:var(--dim);font-size:11px;text-transform:uppercase;letter-spacing:.6px;margin:2px 0 5px}
  .arRow{margin-bottom:8px}
  .arcustom{display:flex;align-items:center;gap:6px;margin-bottom:4px}
  .arcustom input{width:100%;min-width:0;text-align:center}
  .arcustom span{color:var(--dim)}
  .arcustom.on input{border-color:var(--accent)}

  /* ---------- transport ---------- */
  .transport{display:flex;align-items:center;gap:8px;margin-top:12px;flex-wrap:wrap}
  .tc{font-variant-numeric:tabular-nums;font-size:13px;color:var(--dim)}
  .tc b{color:var(--txt);font-weight:600}

  /* ---------- timeline ---------- */
  .tl-wrap{margin-top:14px;user-select:none}
  .tl{position:relative;height:70px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;overflow:hidden;touch-action:none;cursor:pointer}
  #strip{position:absolute;inset:0;display:flex;opacity:.9}
  #strip canvas{height:100%;flex:1 1 0;min-width:0;display:block}
  .mask{position:absolute;top:0;bottom:0;background:rgba(6,9,13,.72);pointer-events:none}
  .sel{position:absolute;top:0;bottom:0;border-left:2px solid var(--accent);border-right:2px solid var(--accent);
       box-shadow:inset 0 0 0 1px rgba(76,194,255,.25);pointer-events:none}
  .handle{position:absolute;top:0;bottom:0;width:16px;margin-left:-8px;cursor:ew-resize;touch-action:none;z-index:5}
  .handle::after{content:"";position:absolute;left:5px;top:50%;transform:translateY(-50%);
    width:6px;height:26px;border-radius:3px;background:var(--accent);box-shadow:0 0 0 1px rgba(0,0,0,.4)}
  .handle:hover::after{background:#8bd8ff}
  .playhead{position:absolute;top:0;bottom:0;width:2px;margin-left:-1px;background:#fff;pointer-events:none;z-index:6;box-shadow:0 0 6px rgba(255,255,255,.7)}
  .ruler{display:flex;justify-content:space-between;margin-top:4px;color:var(--dim);font-size:11px;font-variant-numeric:tabular-nums}

  /* saved clips drawn along the bottom of the timeline */
  #segBand{position:absolute;left:0;right:0;bottom:0;height:16px;pointer-events:none;z-index:4}
  .segbar{position:absolute;bottom:0;height:16px;min-width:3px;background:rgba(63,185,80,.42);
    border:1px solid rgba(63,185,80,.95);border-radius:3px;overflow:hidden;
    font-size:9.5px;line-height:14px;text-align:center;color:#dfffe6;font-weight:600}
  .segbar.on{background:rgba(76,194,255,.5);border-color:#8bd8ff;color:#eaf7ff}

  /* ---------- shift bar ---------- */
  .shiftrow{display:flex;align-items:center;gap:8px;margin-top:7px}
  .shift-lbl{color:var(--dim);font-size:11px;font-variant-numeric:tabular-nums;letter-spacing:.2px}
  .shift-lbl b{color:var(--accent);font-weight:600}
  .shiftbtns{display:flex;gap:2px}
  .shiftbtns button{min-width:26px;padding:0 6px;font-size:14px;line-height:20px;border-radius:5px;
    background:transparent;border-color:transparent;color:var(--dim);text-align:center}
  .shiftbtns button:hover:not(:disabled){background:var(--panel2);border-color:var(--line);color:var(--txt)}
  /* 4px of visible track sitting 2px under the timeline; the grab area extends
     below it so a thin line is still easy to catch */
  .shiftbar{position:relative;height:12px;margin-top:2px;touch-action:none;cursor:pointer}
  .shiftbar::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;
    background:#252d38;border-radius:99px}
  .shiftbar:hover .shiftblk{background:#6bcfff}
  .shiftblk{position:absolute;top:0;height:4px;min-width:12px;
    background:var(--accent);border-radius:99px;cursor:grab;transition:background .12s}
  .shiftblk:active{cursor:grabbing}

  .marks{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;align-items:center}
  .pill{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:12.5px;font-variant-numeric:tabular-nums}
  .pill span{color:var(--dim)}
  .pill b{font-weight:600}
  .pill.dur b{color:var(--accent)}
  .edit{cursor:text;border-bottom:1px dotted #4a5663;padding-bottom:1px}
  .edit:hover{border-bottom-color:var(--accent);color:var(--accent)}
  .edit input{width:88px;padding:0 3px;border:1px solid var(--accent);border-radius:4px;
    background:#0b0f14;color:var(--txt);font:inherit;font-weight:600;text-align:center}

  /* ---------- clip list ---------- */
  #clipsWrap{display:none;margin-top:18px}
  .clips-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
  .clips-head h3{margin:0;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim);font-weight:600}
  #clipList{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}
  .crow{display:flex;align-items:center;gap:10px;padding:7px 10px;border-top:1px solid var(--line);font-size:12.5px}
  .crow:first-child{border-top:none}
  .crow:hover{background:var(--panel2)}
  .crow.on{background:#12212b;box-shadow:inset 2px 0 0 var(--accent)}
  .cthumb{border-radius:3px;border:1px solid var(--line);display:block;flex:none}
  .crow.over{opacity:.45}
  .crow.over .cthumb{filter:grayscale(1)}
  .crow.over .cdur{color:var(--warn)}
  .cnum{width:20px;color:var(--dim);font-variant-numeric:tabular-nums;flex:none}
  .cname{flex:1 1 90px;min-width:60px;max-width:230px;display:flex;align-items:center}
  .cname input{width:100%;background:transparent;border:1px solid transparent;border-radius:6px;
    padding:2px 6px;color:var(--txt);font:inherit}
  .cname input:hover{border-color:var(--line)}
  .cname input:focus{outline:none;border-color:var(--accent);background:#0b0f14}
  .cname input::placeholder{color:#5a6572}
  .ctimes{font-variant-numeric:tabular-nums;color:var(--dim);flex:none}
  .ctimes b{color:var(--txt);font-weight:600}
  .cdur{font-variant-numeric:tabular-nums;color:var(--accent);font-weight:600;width:64px;text-align:right;flex:none}
  .cbtns{display:flex;gap:4px;flex:none}
  .cbtns button{padding:3px 8px;font-size:11.5px;border-radius:6px}
  @media(max-width:760px){ .ctimes{display:none} }

  /* ---------- settings ---------- */
  .row{display:flex;align-items:center;gap:8px;margin-bottom:10px}
  .row label{flex:0 0 78px;color:var(--dim);font-size:12.5px}
  input[type=text],input[type=number],select{
    font:inherit;background:var(--panel2);color:var(--txt);border:1px solid var(--line);
    border-radius:7px;padding:6px 8px;width:100%;min-width:0;
  }
  input:focus,select:focus{outline:none;border-color:var(--accent)}
  input[type=range]{width:100%;accent-color:var(--accent)}
  .seg{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:10px}
  .seg button{padding:5px 9px;font-size:12.5px;border-radius:7px}
  .seg button.on{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
  .hint{color:var(--dim);font-size:11.5px;margin:-4px 0 12px}
  .chk{display:flex;align-items:center;gap:7px;color:var(--dim);font-size:12.5px;margin-bottom:10px;cursor:pointer}
  hr{border:none;border-top:1px solid var(--line);margin:14px 0}

  .est{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:9px 11px;font-size:12.5px;margin-bottom:12px}
  .est div{display:flex;justify-content:space-between;margin:2px 0}
  .est span{color:var(--dim)}
  .est b{font-variant-numeric:tabular-nums;font-weight:600}

  #exportBtn{width:100%;padding:11px}
  #snapBtn,#sbBtn,#gifBtn,#msBtn{width:100%;padding:9px;margin-top:2px}

  /* ---------- tabs ---------- */
  /* browser-style tabs: the active one joins onto the panel below it */
  /* no left padding, and the strip's underline matches the panel border, so the
     active tab's edges line up exactly with the box beneath it */
  .tabs{display:flex;gap:3px;margin:0;padding:0;border-bottom:1px solid #2f5f79;position:relative;z-index:1}
  .tabs button{flex:1;padding:8px 10px;font-size:12.5px;color:var(--dim);
    background:transparent;border:1px solid transparent;border-bottom:none;
    border-radius:9px 9px 0 0;margin-bottom:-1px;position:relative}
  .tabs button:hover:not(.on){color:var(--txt);background:rgba(255,255,255,.03);border-color:transparent}
  .tabs button.on{background:#16303f;border-color:#2f5f79;border-top:2px solid var(--accent);
    color:#bfe9ff;font-weight:600;padding-top:7px}
  .tabs button.on::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:#16303f}
  .tabpanel{background:#16303f;border:1px solid #2f5f79;border-top:none;
    border-radius:0 0 10px 10px;padding:13px 12px 12px;margin-bottom:12px}
  .tabpanel hr{border-top-color:#2f5f79}
  .tabpanel h3{color:#8fc9e6}
  .ends{display:flex;justify-content:space-between;color:var(--dim);font-size:11px;margin:3px 0 8px}
  .grid2{display:flex;align-items:center;gap:6px;margin-bottom:8px}
  .grid2 input{width:100%;min-width:0;text-align:center}
  .grid2 span{color:var(--dim);font-size:12.5px}
  .grid2 label{flex:0 0 44px;color:var(--dim);font-size:12.5px}
  #stopBtn{width:100%;padding:9px;margin-top:8px;display:none}
  .bar{height:6px;background:var(--panel2);border-radius:99px;overflow:hidden;margin-top:10px;display:none}
  .bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}
  #status{font-size:12px;color:var(--dim);margin-top:8px;text-align:center;min-height:16px}

  #result{display:none;margin-top:14px}
  #result video{width:100%;border-radius:8px;background:#000;border:1px solid var(--line)}
  #saved{display:none;margin-top:14px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);padding:10px 12px}
  #saved h4{margin:0 0 6px;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim)}
  #savedList{margin:0;padding-left:16px;font-size:12px;color:var(--txt);line-height:1.7;max-height:190px;overflow:auto}
  .note{font-size:11.5px;color:var(--warn);margin-top:8px;line-height:1.4}
  .kbd{display:inline-block;background:var(--panel2);border:1px solid var(--line);border-bottom-width:2px;
    border-radius:5px;padding:0 5px;font-size:11px;font-family:ui-monospace,Menlo,Consolas,monospace}
  .keys{color:var(--dim);font-size:11.5px;margin-top:12px;line-height:1.9}
</style>
</head>
<body>
<div class="wrap">

  <header>
    <h1>Pocket Video Trimmer</h1>
    <span class="sub">trim &middot; resize &middot; fps &middot; storyboard</span>
    <span class="spacer"></span>
    <button id="newBtn" class="ghost" style="display:none">Load another video</button>
    <span class="verwrap"><span class="ver">v2.9</span><span class="by">by C_Nugget</span></span>
  </header>

  <div id="drop">
    <div class="big">&#9634;</div>
    <h2>Drop a video here</h2>
    <p>or click to choose a file &nbsp;&middot;&nbsp; MP4, MOV, WebM, MKV &nbsp;&middot;&nbsp; nothing is uploaded, it all stays on this computer</p>
    <input type="file" id="file" accept="video/*" hidden>
  </div>

  <div id="app">
    <div class="grid">

      <!-- LEFT -->
      <div>
        <div class="stage" id="stage">
          <video id="video" playsinline></video>
          <canvas id="exportCanvas"></canvas>
          <div id="cropLayer">
            <div id="cropBox" data-h="move">
              <span class="ch" data-h="nw"></span><span class="ch" data-h="n"></span><span class="ch" data-h="ne"></span>
              <span class="ch" data-h="w"></span><span class="ch" data-h="e"></span>
              <span class="ch" data-h="sw"></span><span class="ch" data-h="s"></span><span class="ch" data-h="se"></span>
              <span class="cropdims" id="cropDims"></span>
            </div>
          </div>
          <div class="badge" id="srcBadge"></div>
        </div>

        <div class="transport">
          <button id="playBtn" class="icobtn" title="Play / pause (Space)">&#9654;</button>
          <button id="prevF" class="icobtn" title="Previous frame (&larr;)">&#8676;</button>
          <button id="nextF" class="icobtn" title="Next frame (&rarr;)">&#8677;</button>
          <span class="tc"><b id="curTime">0:00.00</b> / <span id="totTime">0:00.00</span></span>
          <span class="spacer"></span>
          <button id="cropBtn" title="Show or hide the crop box (C)">Crop &nbsp;<span class="kbd">C</span></button>
          <button id="setIn">Set start &nbsp;<span class="kbd">I</span></button>
          <button id="setOut">Set end &nbsp;<span class="kbd">O</span></button>
          <button id="loopBtn" class="ghost" title="Loop the selection">Loop: off</button>
        </div>

        <div class="tl-wrap">
          <div class="tl" id="tl">
            <div id="strip"></div>
            <div class="mask" id="maskL"></div>
            <div class="mask" id="maskR"></div>
            <div class="sel" id="sel"></div>
            <div id="segBand"></div>
            <div class="playhead" id="ph"></div>
            <div class="handle" id="hIn"></div>
            <div class="handle" id="hOut"></div>
          </div>
          <div class="shiftbar" id="shiftBar" title="Drag to move the selection without changing its length">
            <div class="shiftblk" id="shiftBlk"></div>
          </div>
          <div class="ruler"><span>0:00</span><span id="rulMid"></span><span id="rulEnd"></span></div>

          <div class="shiftrow">
            <span class="shift-lbl" id="shiftLbl"></span>
            <span class="spacer"></span>
            <span class="shiftbtns" id="shiftBtns">
              <button data-d="-1" title="Back one second (Shift + [)">&laquo;</button>
              <button data-d="-f" title="Back one frame ([)">&lsaquo;</button>
              <button data-d="f"  title="Forward one frame (])">&rsaquo;</button>
              <button data-d="1"  title="Forward one second (Shift + ])">&raquo;</button>
            </span>
          </div>

          <div class="marks">
            <span class="pill"><span>Start</span> <b id="pIn" class="edit" title="Click to type an exact time">0:00.00</b></span>
            <span class="pill"><span>End</span> <b id="pOut" class="edit" title="Click to type an exact time">0:00.00</b></span>
            <span class="pill dur"><span>Duration</span> <b id="pDur" class="edit" title="Click to type an exact length, e.g. 30 or 1:30">0:00.00</b></span>
            <button id="addClip" class="primary small" title="Save this selection to the clip list (A)">+ Add clip &nbsp;<span class="kbd" style="background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25)">A</span></button>
            <button id="resetSel" class="ghost small">Reset to full clip</button>
          </div>

          <div class="keys">
            <span class="kbd">Space</span> play/pause &nbsp; <span class="kbd">&larr;</span><span class="kbd">&rarr;</span> step 1 frame &nbsp;
            <span class="kbd">Shift</span>+<span class="kbd">&larr;</span><span class="kbd">&rarr;</span> step 1 sec &nbsp;
            <span class="kbd">I</span> set start &nbsp; <span class="kbd">O</span> set end &nbsp; <span class="kbd">A</span> <span id="keyA">add clip</span> &nbsp; <span class="kbd">C</span> crop &nbsp; <span class="kbd">S</span> snapshot &nbsp; <span class="kbd">Home</span>/<span class="kbd">End</span> jump
            <br>Click <b style="color:var(--txt)">Start</b>, <b style="color:var(--txt)">End</b> or <b style="color:var(--txt)">Duration</b> above to type an exact value — seconds (<code>90</code>) or minutes:seconds (<code>1:30</code>).
          </div>

          <!-- manual storyboard frames: only in picture mode -->
          <div id="snapsWrap" style="display:none">
            <div class="clips-head">
              <h3 id="snapsTitle">Snapshots</h3>
              <span class="spacer"></span>
              <button id="clearSnaps" class="ghost small">Clear all</button>
            </div>
            <div id="snapList"></div>
            <div class="hint" style="margin-top:8px">
              The exact frames your manual storyboard will use, in this order. Park the playhead and press
              <b style="color:var(--txt)">+ Add snapshot</b> (or <span class="kbd">A</span>). Set the grid over in
              <b style="color:var(--txt)">Manual Storyboard</b>, then export.
            </div>
          </div>

          <!-- clip list: only appears once you add something -->
          <div id="clipsWrap">
            <div class="clips-head">
              <h3 id="clipsTitle">Clip list</h3>
              <span class="spacer"></span>
              <button id="clearClips" class="ghost small">Clear all</button>
            </div>
            <div id="clipList"></div>
            <div class="hint" style="margin-top:8px">
              Export uses this list — the timeline selection is only used for adding new clips.
              Use ▶ to preview a clip, Set to overwrite it with the current timeline selection, ✕ to remove it. Click its times to type exact values.
              Names are optional and become the file name.
            </div>
          </div>
        </div>
      </div>

      <!-- RIGHT -->
      <div>
        <div class="card">
          <div class="panelbox">
          <h3 class="collap open" id="sizeHead">Size &amp; crop<span class="chev">&#9662;</span></h3>
          <div id="sizeBody">
          <div id="cropSection" style="display:none">
            <h3>Crop &amp; aspect ratio</h3>
            <div class="seg arRow">
              <button data-ar="0" data-lbl="free">Free</button>
              <button data-ar="src" data-lbl="original">Original</button>
              <button data-ar="1" data-lbl="1:1">1:1 square</button>
            </div>
            <div class="arlab">Landscape</div>
            <div class="seg arRow">
              <button data-ar="2.33333" data-lbl="21:9">21:9</button>
              <button data-ar="1.77778" data-lbl="16:9">16:9</button>
              <button data-ar="1.5" data-lbl="3:2">3:2</button>
              <button data-ar="1.33333" data-lbl="4:3">4:3</button>
            </div>
            <div class="arlab">Portrait</div>
            <div class="seg arRow">
              <button data-ar="0.5625" data-lbl="9:16">9:16</button>
              <button data-ar="0.5" data-lbl="1:2">1:2</button>
              <button data-ar="0.66667" data-lbl="2:3">2:3</button>
              <button data-ar="0.75" data-lbl="3:4">3:4</button>
              <button data-ar="0.8" data-lbl="4:5">4:5</button>
            </div>
            <div class="arlab">Custom</div>
            <div class="arcustom" id="arCustom">
              <input type="number" id="arW" min="1" max="9999" step="1" placeholder="9">
              <span>:</span>
              <input type="number" id="arH" min="1" max="9999" step="1" placeholder="16">
              <button id="arApply" class="small">Use</button>
            </div>
            <div class="hint" id="cropInfo" style="margin:8px 0"></div>
            <button id="cropMax" class="small" style="width:100%">Biggest box that fits</button>
            <hr>
          </div>

          <div class="seg" id="scaleSeg">
            <button data-s="1">100%</button>
            <button data-s="0.75">75%</button>
            <button data-s="0.5">50%</button>
            <button data-s="0.25">25%</button>
          </div>
          <div class="row">
            <label>Width</label><input type="number" id="w" min="16" step="2">
          </div>
          <div class="row">
            <label>Height</label><input type="number" id="h" min="16" step="2">
          </div>
          <label class="chk"><input type="checkbox" id="lockAr" checked> Lock aspect ratio</label>
          <div class="hint" id="sizeHint"></div>
          </div>
          </div>

          <div class="tabs" id="tabs">
            <button data-tab="video" class="on">Export video</button>
            <button data-tab="pic">Export picture</button>
          </div>

          <div id="tabVideo" class="tabpanel">
            <h3>Frame rate</h3>
            <div class="seg" id="fpsSeg"></div>
            <div class="row">
              <label>Custom</label><input type="number" id="fps" min="1" max="120" step="1">
            </div>
            <div class="hint">Higher than the source frame rate won't add detail.</div>

            <hr>
            <h3>Compression</h3>
            <input type="range" id="q" min="0" max="100" value="78">
            <div class="ends"><span>Smaller file</span><span>Bigger file</span></div>
            <div class="hint" id="qHint"></div>
            <label class="chk"><input type="checkbox" id="keepAudio" checked> Include audio</label>

            <div class="est">
              <div><span>Output</span><b id="eSize">—</b></div>
              <div><span>Bitrate</span><b id="eRate">—</b></div>
              <div><span>Encoder</span><b id="eCodec">—</b></div>
              <div><span id="eBytesLbl">Est. file size</span><b id="eBytes">—</b></div>
              <div><span>Export takes about</span><b id="eTime">—</b></div>
            </div>

            <button id="exportBtn" class="primary">Export clip</button>
          </div>

          <div id="tabPic" class="tabpanel" style="display:none">
            <h3>Largest side</h3>
            <div class="row">
              <label>Max px</label><input type="number" id="imgMax" min="64" max="8000" step="10" value="1920">
            </div>
            <div class="hint" id="imgMaxHint">Pictures are scaled down to fit inside this. Applies to snapshots, storyboards and GIFs.</div>

            <hr>
            <h3>Single frame</h3>
            <div class="hint">Saves the frame you are parked on right now, as a PNG.</div>
            <button id="snapBtn" class="primary" title="Save the current frame as an image (S)">Take snapshot</button>

            <div id="autoSbSec">
            <hr>
            <h3>Auto Storyboard <span style="color:var(--warn);font-size:10px">BETA</span></h3>
            <div class="grid2">
              <label>Grid</label>
              <input type="number" id="sbCols" min="1" max="10" step="1" value="3">
              <span>&times;</span>
              <input type="number" id="sbRows" min="1" max="10" step="1" value="3">
            </div>
            <div class="hint" id="sbHint"></div>
            <button id="sbBtn" class="primary" title="A sheet of frames spread evenly across the selection">Export storyboard</button>
            </div>

            <div id="manSbSec" style="display:none">
            <hr>
            <h3>Manual Storyboard <span style="color:var(--warn);font-size:10px">BETA</span></h3>
            <div class="grid2">
              <label>Grid</label>
              <input type="number" id="msCols" min="1" max="10" step="1" value="3">
              <span>&times;</span>
              <input type="number" id="msRows" min="1" max="10" step="1" value="3">
            </div>
            <div class="hint" id="msHint"></div>
            <button id="msBtn" class="primary">Export manual storyboard</button>
            </div>

            <hr>
            <h3>Animated GIF</h3>
            <div class="row">
              <label>Frames/s</label><input type="number" id="gfps" min="1" max="20" step="1" value="10">
            </div>
            <div class="hint" id="gifHint">256 colours and no sound, and files grow fast. A smaller width helps.</div>
            <button id="gifBtn" class="primary">Export as GIF</button>
          </div>

          <button id="stopBtn" class="danger">Stop</button>
          <div class="bar" id="bar"><i id="barI"></i></div>
          <div id="status"></div>
          <div class="hint" id="expNote" style="display:none;margin:8px 0 0;text-align:center">
            Leave this tab on screen — if you switch away, the export pauses and picks up when you come back.
          </div>

          <div id="result">
            <video id="outVid" controls></video>
            <img id="outImg" alt="" style="display:none;width:100%;border-radius:8px;background:#000;border:1px solid var(--line)">
            <div style="display:flex;gap:8px;margin-top:10px">
              <button id="dlBtn" class="primary" style="flex:1">Download again</button>
              <button id="clearRes" class="ghost">Clear</button>
            </div>
            <div class="note" id="outNote"></div>
          </div>

          <div id="saved">
            <h4 id="savedWhere">Saved</h4>
            <ol id="savedList"></ol>
            <div class="note" id="savedNote"></div>
          </div>
        </div>
      </div>

    </div>
  </div>
</div>

<script>
"use strict";
(function(){

/* ---------------- helpers ---------------- */
const $ = id => document.getElementById(id);
const clamp = (v,a,b) => Math.min(b, Math.max(a, v));
function tc(t, frac){                       // 1:23.45  /  1:05:03.20
  if(!isFinite(t)||t<0) t=0;
  const h = Math.floor(t/3600);
  const m = Math.floor((t-h*3600)/60), s = t - h*3600 - m*60;
  const mm = h ? String(m).padStart(2,"0") : String(m);
  const hh = h ? h+":" : "";
  return frac===false ? hh+mm+":"+String(Math.floor(s)).padStart(2,"0")
                      : hh+mm+":"+(s<10?"0":"")+s.toFixed(2);
}
function stamp(t){ t=Math.max(0,t||0); return Math.floor(t/60)+"m"+String(Math.floor(t%60)).padStart(2,"0")+"s"; }
function bytes(n){
  if(!isFinite(n)) return "—";
  if(n < 1024*1024) return (n/1024).toFixed(0)+" KB";
  if(n < 1024*1024*1024) return (n/1048576).toFixed(1)+" MB";
  return (n/1073741824).toFixed(2)+" GB";
}
function even(n){ n = Math.round(n); return n%2 ? n+1 : n; }
function safeName(s, n){ return String(s||"").replace(/[\\/:*?"<>|\x00-\x1f]+/g,"-").replace(/^\.+/,"").trim().slice(0,n||60); }
function once(el,ev){ return new Promise(r=>el.addEventListener(ev,r,{once:true})); }

/* ---------------- state ---------------- */
const V = $("video");
let srcUrl=null, srcName="clip", dur=0, natW=0, natH=0, srcFps=30;
let inT=0, outT=0, looping=false, dragging=null, exporting=false, cancelExport=false;
let audioCtx=null, mediaSrc=null, monitorGain=null, streamDest=null;
let lastBlob=null, lastExt="webm", lastMeta=null, sheetKind="auto";
let segments=[], activeSeg=-1, segId=0;

/* ---------------- file loading ---------------- */
const drop=$("drop"), fileInput=$("file");
fileInput.addEventListener("click", e=>e.stopPropagation());
drop.addEventListener("click", ()=>fileInput.click());
fileInput.addEventListener("change", e=>{ if(e.target.files[0]) load(e.target.files[0]); e.target.value=""; });
["dragenter","dragover"].forEach(ev=>drop.addEventListener(ev,e=>{e.preventDefault();drop.classList.add("over")}));
["dragleave","drop"].forEach(ev=>drop.addEventListener(ev,e=>{e.preventDefault();drop.classList.remove("over")}));
// ONE drop handler only, on the window — two handlers meant a drop started the load twice
window.addEventListener("dragover", e=>e.preventDefault());
window.addEventListener("drop", e=>{
  e.preventDefault(); drop.classList.remove("over");
  const f = e.dataTransfer && e.dataTransfer.files[0];
  if(f) load(f);
});
$("newBtn").addEventListener("click", ()=>fileInput.click());

const DROP_HTML = drop.innerHTML;
let loadSeq = 0;                       // only the newest load() is allowed to touch the UI
let loadedOnce = false;

async function load(file){
  if(exporting){ alert("Hang on until the export finishes, then load the next video."); return; }
  if(segments.length && loadedOnce &&
     !confirm("Loading a new video clears the clip list ("+segments.length+" clips). Continue?")) return;

  const myId = ++loadSeq;
  const newUrl = URL.createObjectURL(file);
  const prevUrl = srcUrl;

  const bail = (msg)=>{
    URL.revokeObjectURL(newUrl);
    if(myId !== loadSeq) return;        // a newer load took over — stay quiet
    srcUrl = prevUrl;
    if(loadedOnce){                     // don't destroy a session that's already open
      if(V.src !== prevUrl && prevUrl){ V.src = prevUrl; }
      alert(msg+"\n\nYour current video is still open.");
    }else{
      drop.innerHTML = DROP_HTML; drop.style.display="block"; $("app").style.display="none";
      alert(msg);
    }
  };

  srcName = (file.name||"clip").replace(/\.[^.]+$/,"") || "clip";
  srcUrl = newUrl;
  clearResult(); clearSaved();
  V.src = newUrl;
  V.muted = false;

  const how = await new Promise(res=>{
    let settled=false, timer=0;
    const done = v => { if(settled) return; settled=true; clearTimeout(timer);
                        V.onloadedmetadata=null; V.onerror=null; res(v); };
    V.onloadedmetadata = ()=>done("ok");
    V.onerror          = ()=>done("err");
    timer = setTimeout(()=>done("slow"), 120000);
  });
  if(myId !== loadSeq){ URL.revokeObjectURL(newUrl); return; }

  if(how==="err") return bail("This browser can't open “"+file.name+"”.\n\nTry an MP4, MOV or WebM file — Chrome can't read every format (AVI and some MKVs won't work).");
  if(how==="slow") return bail("“"+file.name+"” is taking too long to open. If it's on a network or cloud drive, copy it to this computer first.");

  dur = V.duration;
  if(!isFinite(dur) || dur<=0){          // some WebM/MKV files report no duration until you seek past the end
    try{
      V.currentTime = 1e7;
      await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,2500))]);
      dur = isFinite(V.duration) ? V.duration : V.currentTime;
      V.currentTime = 0;
      await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,1500))]);
    }catch(e){}
  }
  if(myId !== loadSeq){ URL.revokeObjectURL(newUrl); return; }
  if(!isFinite(dur) || dur<=0) return bail("Couldn't work out how long that video is, so it can't be trimmed. Try converting it to MP4 first.");

  if(prevUrl) URL.revokeObjectURL(prevUrl);   // safe now: the new file is definitely in
  natW = V.videoWidth || 640; natH = V.videoHeight || 360;
  inT = 0; outT = dur;
  segments = []; activeSeg = -1;
  removeCrop();

  if(!loadedOnce) drop.innerHTML = '<div class="big">&#9634;</div><h2>Reading video…</h2><p>one moment</p>';
  srcFps = 30;
  await detectFps();
  if(myId !== loadSeq) return;

  loadedOnce = true;
  drop.style.display="none"; $("app").style.display="block"; $("newBtn").style.display="inline-block";

  $("w").value = natW; $("h").value = natH;
  $("totTime").textContent = tc(dur);
  $("rulEnd").textContent = tc(dur,false);
  $("rulMid").textContent = tc(dur/2,false);

  buildFpsSeg();
  $("fps").value = Math.round(srcFps);
  $("srcBadge").textContent = natW+"×"+natH+" · "+Math.round(srcFps)+" fps · "+tc(dur,false);
  document.title = srcName+" — Pocket Video Trimmer";
  markScale(1);
  refresh(); update();
  buildStrip(newUrl, myId);
}

/* estimate source fps by counting presented frames over a short muted sample */
async function detectFps(){
  if(!("requestVideoFrameCallback" in HTMLVideoElement.prototype)) return;
  const prevMuted = V.muted;
  V.muted = true;
  let stop = false;
  try{
    V.currentTime = Math.min(0.2, dur/4);
    await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,1500))]);
    let first=null, last=null, n=0;
    const done = new Promise(res=>{
      const finish = ()=>{ stop=true; res(); };
      const cb=(now,md)=>{
        if(stop) return;
        if(first===null) first=md.mediaTime; else { last=md.mediaTime; n++; }
        if(n>=12 || (last!==null && last-first>0.5)) return finish();
        V.requestVideoFrameCallback(cb);
      };
      V.requestVideoFrameCallback(cb);
      setTimeout(finish, 1400);           // rVFC never fired (or is throttled) — give up
    });
    await V.play().catch(()=>{});
    await done;
    if(n>2 && last>first){
      const f = n/(last-first);
      if(f>4 && f<125) srcFps = Math.round(f*100)/100;
    }
  }catch(e){}
  stop = true;
  try{ V.pause(); }catch(e){}
  V.muted = prevMuted;
  V.currentTime = 0;
  await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,800))]);
}

/* ---------------- filmstrip ---------------- */
async function buildStrip(url, id){
  const strip=$("strip"); strip.innerHTML="";
  const total=dur;
  const v=document.createElement("video");
  v.src=url; v.muted=true; v.playsInline=true;
  try{
    await Promise.race([once(v,"loadeddata"), once(v,"error"), new Promise(r=>setTimeout(r,15000))]);
  }catch(e){ return; }

  const vw=v.videoWidth||16, vh=v.videoHeight||9;
  const stripW=Math.max(240, strip.clientWidth || $("tl").clientWidth || 900);
  const stripH=Math.max(28,  strip.clientHeight || $("tl").clientHeight || 64);
  // Pick the number of frames from the video's own shape rather than a fixed 12.
  // A portrait clip gets lots of narrow thumbnails instead of squashed wide ones.
  // Keep the count modest: every thumbnail is a full decode+seek of the source,
  // and on tall phone footage that used to mean 30-40 of them. 1x pixels is
  // plenty at this size.
  const ideal = Math.max(16, Math.round(stripH*vw/vh));
  const N = clamp(Math.round(stripW/ideal), 6, 16);
  const cw = Math.max(8, Math.round(stripW/N)), ch = Math.max(8, Math.round(stripH));
  const sc = Math.max(cw/vw, ch/vh);                 // fill the cell without stretching
  const dw = vw*sc, dh = vh*sc, ox=(cw-dw)/2, oy=(ch-dh)/2;

  for(let i=0;i<N;i++){
    if(id !== loadSeq){ v.removeAttribute("src"); return; }
    // Stand aside while an export is running. Decoding thumbnails from a second
    // copy of the video used to fight the export for the same decoder, which
    // dropped frames and made the output stutter.
    while(exporting){
      await new Promise(r=>setTimeout(r,300));
      if(id !== loadSeq){ v.removeAttribute("src"); return; }
    }
    const c=document.createElement("canvas"); c.width=cw; c.height=ch;
    strip.appendChild(c);
    try{
      v.currentTime = Math.min(total-0.03, (i+0.5)*total/N);
      await Promise.race([once(v,"seeked"), new Promise(r=>setTimeout(r,1500))]);
      const cx=c.getContext("2d",{alpha:false});
      cx.imageSmoothingEnabled=true; cx.imageSmoothingQuality="high";
      cx.drawImage(v, ox, oy, dw, dh);
    }catch(e){}
  }
  v.removeAttribute("src");
}

/* ---------------- transport ---------------- */
$("playBtn").addEventListener("click", togglePlay);
function togglePlay(){
  if(exporting) return;
  if(V.paused){ if(V.currentTime<inT-0.01||V.currentTime>=outT-0.01) V.currentTime=inT; V.play(); }
  else V.pause();
}
V.addEventListener("play", ()=>$("playBtn").innerHTML="&#10073;&#10073;");
V.addEventListener("pause",()=>$("playBtn").innerHTML="&#9654;");
V.addEventListener("timeupdate", update);
V.addEventListener("seeked", update);

function rafLoop(){
  if(!V.paused && !exporting){
    if(V.currentTime>=outT-0.02){ if(looping){ V.currentTime=inT; } else { V.pause(); V.currentTime=outT; } }
    update();
  }
  requestAnimationFrame(rafLoop);
}
requestAnimationFrame(rafLoop);

$("prevF").addEventListener("click", ()=>step(-1));
$("nextF").addEventListener("click", ()=>step(1));
function step(dir, big){
  V.pause();
  const d = big ? 1 : 1/(srcFps||30);
  V.currentTime = clamp(V.currentTime + dir*d, 0, dur);
}
/* Setting a start later than the current end used to clamp the start back onto
   the end. Marking a new clip after the previous one is the normal way to work,
   so the other mark gets out of the way instead. */
function setIn(t){
  inT = clamp(t, 0, Math.max(0, dur-0.02));
  if(outT <= inT + 0.02) outT = dur;          // start moved past the end — open the end up
  refresh();
}
function setOut(t){
  outT = clamp(t, 0.02, dur);
  if(inT >= outT - 0.02) inT = 0;             // end moved before the start — open the start up
  refresh();
}
$("setIn").addEventListener("click", ()=>setIn(V.currentTime));
$("setOut").addEventListener("click", ()=>setOut(V.currentTime));
$("resetSel").addEventListener("click", ()=>{ if(picMode){ clearSnaps(); return; } inT=0; outT=dur; refresh(); });
$("loopBtn").addEventListener("click", e=>{ looping=!looping; e.target.textContent="Loop: "+(looping?"on":"off"); e.target.classList.toggle("ghost",!looping); });

/* ---------------- click-to-type time fields ---------------- */
function parseTime(s){                     // "1:23.4", "0:05", "83.4", "1:02:03"
  s = String(s).trim(); if(!s) return null;
  const parts = s.split(":").map(x=>parseFloat(x));
  if(parts.some(x=>isNaN(x))) return null;
  return parts.reduce((a,x)=>a*60+x, 0);
}
function makeTimeEditor(el, get, set){
  el.addEventListener("click", function(e){
    e.stopPropagation();
    if(exporting || el.querySelector("input")) return;
    const inp = document.createElement("input");
    inp.value = tc(get()); el.textContent=""; el.appendChild(inp);
    inp.focus(); inp.select();
    let done=false;
    const commit = ok => {
      if(done) return; done=true;
      const v = ok ? parseTime(inp.value) : null;
      inp.remove();
      if(v !== null && isFinite(v)) set(v);
      refresh();
    };
    inp.addEventListener("blur", ()=>commit(true));
    inp.addEventListener("click", ev=>ev.stopPropagation());
    inp.addEventListener("keydown", ev=>{
      ev.stopPropagation();
      if(ev.key==="Enter"){ ev.preventDefault(); commit(true); }
      if(ev.key==="Escape"){ ev.preventDefault(); commit(false); }
    });
  });
}
makeTimeEditor($("pIn"),  ()=>inT,      v=>{ setIn(v);  V.currentTime=inT; });
makeTimeEditor($("pOut"), ()=>outT,     v=>{ setOut(v); V.currentTime=outT; });
makeTimeEditor($("pDur"), ()=>outT-inT, v=>{
  const len = clamp(v, 0.02, dur);
  if(inT + len <= dur){ outT = inT + len; }
  else { outT = dur; inT = Math.max(0, dur - len); }
  V.currentTime = inT;
});

document.addEventListener("keydown", e=>{
  if(exporting) return;
  const t=e.target.tagName;
  if(t==="INPUT"||t==="SELECT"||t==="TEXTAREA") return;
  const k=e.key;
  if(k===" "){ e.preventDefault(); togglePlay(); }
  else if(k==="ArrowLeft"){ e.preventDefault(); step(-1, e.shiftKey); }
  else if(k==="ArrowRight"){ e.preventDefault(); step(1, e.shiftKey); }
  else if(k==="i"||k==="I"){ setIn(V.currentTime); }
  else if(k==="o"||k==="O"){ setOut(V.currentTime); }
  else if(k==="a"||k==="A"){ e.preventDefault(); picMode ? addSnap() : addClip(); }
  else if(k==="c"||k==="C"){ e.preventDefault(); toggleCrop(); }
  // holding Shift turns "[" into "{" on most layouts, so accept both
  else if(k==="["||k==="{"){ e.preventDefault(); nudge(e.shiftKey ? -1 : -1/(srcFps||30)); }
  else if(k==="]"||k==="}"){ e.preventDefault(); nudge(e.shiftKey ?  1 :  1/(srcFps||30)); }
  else if(k==="s"||k==="S"){ e.preventDefault(); takeSnapshot(); }
  else if(k==="Home"){ V.currentTime=inT; }
  else if(k==="End"){ V.currentTime=outT; }
});

/* ---------------- timeline drag ---------------- */
const tl=$("tl");
function posToTime(clientX){
  const r=tl.getBoundingClientRect();
  return clamp((clientX-r.left)/r.width,0,1)*dur;
}
tl.addEventListener("pointerdown", e=>{
  if(exporting||!dur) return;
  if(e.target===$("hIn")) dragging="in";
  else if(e.target===$("hOut")) dragging="out";
  else { dragging="seek"; V.pause(); V.currentTime=posToTime(e.clientX); }
  tl.setPointerCapture(e.pointerId);
});
tl.addEventListener("pointermove", e=>{
  if(!dragging) return;
  const t=posToTime(e.clientX);
  if(dragging==="in"){ inT=clamp(t,0,outT-0.02); V.currentTime=inT; }
  else if(dragging==="out"){ outT=clamp(t,inT+0.02,dur); V.currentTime=outT; }
  else V.currentTime=t;
  refresh();
});
["pointerup","pointercancel"].forEach(ev=>tl.addEventListener(ev,()=>dragging=null));

function refresh(){
  const a = dur? inT/dur*100 : 0, b = dur? outT/dur*100 : 100;
  $("maskL").style.left="0"; $("maskL").style.width=a+"%";
  $("maskR").style.left=b+"%"; $("maskR").style.width=(100-b)+"%";
  $("sel").style.left=a+"%"; $("sel").style.width=(b-a)+"%";
  $("hIn").style.left=a+"%"; $("hOut").style.left=b+"%";
  if(activeSeg>=0){                        // highlight only while the selection still matches
    const sg=segments[activeSeg];
    if(!sg || Math.abs(sg.start-inT)>0.001 || Math.abs(sg.end-outT)>0.001) activeSeg=-1;
  }
  if(!$("pIn").querySelector("input"))  $("pIn").textContent=tc(inT);
  if(!$("pOut").querySelector("input")) $("pOut").textContent=tc(outT);
  if(!$("pDur").querySelector("input")) $("pDur").textContent=tc(outT-inT);
  renderClips(); renderSnaps(); renderBand(); renderSnapBand(); renderShift(); estimate();
}
function update(){
  $("curTime").textContent=tc(V.currentTime);
  $("ph").style.left=(dur? V.currentTime/dur*100 : 0)+"%";
}

/* ---------------- shift the whole selection ----------------
   Moves the start and end together so the length stays put. If the selection
   currently matches a saved clip, that clip moves with it. */
const shiftBar=$("shiftBar"), shiftBlk=$("shiftBlk");
let shiftDrag=null;

function renderShift(){
  if(!dur) return;
  shiftBlk.style.left=(inT/dur*100)+"%";
  shiftBlk.style.width=(Math.max(0.3,(outT-inT)/dur*100))+"%";
  $("shiftLbl").innerHTML = (activeSeg>=0 && segments[activeSeg])
    ? "Shift <b>clip "+(activeSeg+1)+"</b> · "+tc(outT-inT)
    : "Shift selection · "+tc(outT-inT);
}
function shiftTo(newStart){
  const len = outT-inT;
  const a = clamp(newStart, 0, Math.max(0, dur-len));
  inT = a; outT = a+len;
  if(activeSeg>=0 && segments[activeSeg]){        // carry the saved clip along
    segments[activeSeg].start = inT;
    segments[activeSeg].end   = outT;
  }
  V.currentTime = inT;
  refresh();
}
function nudge(sec){ if(!exporting && dur) shiftTo(inT+sec); }

shiftBar.addEventListener("pointerdown", e=>{
  if(exporting || !dur) return;
  e.preventDefault();
  const r=shiftBar.getBoundingClientRect();
  if(e.target !== shiftBlk){                       // clicked the track — centre the block there
    shiftTo(clamp((e.clientX-r.left)/r.width,0,1)*dur - (outT-inT)/2);
  }
  shiftDrag={px:e.clientX, start:inT, w:r.width};
  shiftBar.setPointerCapture(e.pointerId);
});
shiftBar.addEventListener("pointermove", e=>{
  if(!shiftDrag) return;
  shiftTo(shiftDrag.start + (e.clientX-shiftDrag.px)/shiftDrag.w*dur);
});
["pointerup","pointercancel"].forEach(ev=>shiftBar.addEventListener(ev, ()=>shiftDrag=null));
$("shiftBtns").addEventListener("click", e=>{
  const b=e.target.closest("button"); if(!b) return;
  const d=b.dataset.d, f=1/(srcFps||30);
  nudge(d==="f" ? f : d==="-f" ? -f : parseFloat(d));
});

/* ---------------- manual storyboard frames ---------------- */
let snaps=[], snapId=0;
function msGrid(){
  return {c: clamp(Math.round(+$("msCols").value||3),1,10),
          r: clamp(Math.round(+$("msRows").value||3),1,10)};
}
const SNAP_MAX = 25;
function makeThumb(){
  const t = targets();
  const w = 56, h = Math.max(12, Math.round(w * t.h / t.w));
  const c = document.createElement("canvas");
  c.width = w*2; c.height = h*2;                 // 2x so it stays sharp
  c.className = "cthumb"; c.style.width = w+"px"; c.style.height = h+"px";
  const x = c.getContext("2d", {alpha:false});
  x.imageSmoothingEnabled = true; x.imageSmoothingQuality = "high";
  try{ drawSource(x, c.width, c.height); }catch(e){}
  return c;
}
function addSnap(){
  if(exporting || !dur) return;
  if(snaps.length >= SNAP_MAX){
    setStatus("That's the limit — "+SNAP_MAX+" snapshots in a manual storyboard.");
    return;
  }
  // pressing A twice without moving would just repeat the same frame
  const last = snaps[snaps.length-1];
  if(last && Math.abs(last.t - V.currentTime) < 0.001){
    setStatus("That's the same frame as snapshot "+snaps.length+" — move the playhead first.");
    return;
  }
  snaps.push({id:++snapId, t:V.currentTime, thumb:makeThumb()});
  // grow the grid so every frame you take has somewhere to go
  let {c,r} = msGrid();
  while(c*r < snaps.length && r < 10) r++;
  while(c*r < snaps.length && c < 10) c++;
  $("msCols").value=c; $("msRows").value=r;
  setStatus("");
  refresh();
}
function clearSnaps(){
  if(exporting || !snaps.length) return;
  if(snaps.length>1 && !confirm("Remove all "+snaps.length+" snapshots?")) return;
  snaps=[]; refresh();
}
$("clearSnaps").addEventListener("click", clearSnaps);

function renderSnaps(){
  const wrap=$("snapsWrap"), list=$("snapList");
  wrap.style.display = (picMode && snaps.length) ? "block" : "none";
  // taking snapshots swaps the auto storyboard out for the manual one
  $("autoSbSec").style.display = snaps.length ? "none" : "block";
  $("manSbSec").style.display  = snaps.length ? "block" : "none";
  $("snapsTitle").textContent = "Snapshots ("+snaps.length+" of "+SNAP_MAX+")";
  if(!picMode || !snaps.length){ list.innerHTML=""; return; }
  if(list.querySelector("input:focus")) return;
  const {c,r} = msGrid(), cells = c*r;
  list.innerHTML="";
  snaps.forEach((sn,i)=>{
    const row=document.createElement("div");
    row.className="crow"+(i>=cells?" over":"");
    const num=document.createElement("span"); num.className="cnum"; num.textContent=(i+1);
    const spacer=document.createElement("span"); spacer.className="cname";
    if(sn.thumb) spacer.appendChild(sn.thumb);
    const times=document.createElement("span"); times.className="ctimes";
    const bT=document.createElement("b"); bT.className="edit"; bT.textContent=tc(sn.t);
    times.appendChild(bT);
    makeTimeEditor(bT, ()=>sn.t, v=>{ sn.t = clamp(v, 0, dur); });
    const note=document.createElement("span"); note.className="cdur";
    note.textContent = i>=cells ? "no cell" : "";
    const btns=document.createElement("span"); btns.className="cbtns";
    const go=document.createElement("button");
    go.textContent="▶"; go.title="Jump to this frame";
    go.addEventListener("click", ev=>{ ev.stopPropagation(); if(!exporting) V.currentTime=sn.t; });
    const use=document.createElement("button");
    use.textContent="Set"; use.title="Move this snapshot to where the playhead is now";
    use.addEventListener("click", ev=>{ ev.stopPropagation(); if(exporting) return; sn.t=V.currentTime; refresh(); });
    const del=document.createElement("button");
    del.textContent="✕"; del.title="Remove"; del.className="danger";
    del.addEventListener("click", ev=>{ ev.stopPropagation(); if(exporting) return;
      snaps.splice(i,1); refresh(); });
    btns.appendChild(go); btns.appendChild(use); btns.appendChild(del);
    row.appendChild(num); row.appendChild(spacer); row.appendChild(times);
    row.appendChild(note); row.appendChild(btns);
    row.addEventListener("click", ()=>{ if(!exporting) V.currentTime=sn.t; });
    list.appendChild(row);
  });
}
function renderSnapBand(){
  if(!picMode || !dur) return;
  const band=$("segBand");
  snaps.forEach((sn,i)=>{
    const el=document.createElement("div");
    el.className="segbar"; el.style.left=(sn.t/dur*100)+"%";
    el.style.width="0"; el.style.minWidth="3px"; el.textContent="";
    band.appendChild(el);
  });
}

/* ---------------- clip list ---------------- */
$("addClip").addEventListener("click", ()=> picMode ? addSnap() : addClip());
function addClip(){
  if(exporting || !dur) return;
  if(outT - inT < 0.05){ setStatus("Selection is too short to add."); return; }
  segments.push({id:++segId, start:inT, end:outT, name:""});
  // Leave the selection unlinked so the shift bar positions the NEXT clip
  // rather than dragging the one you just saved. Click a row to link it.
  activeSeg = -1;
  setStatus("");
  refresh();
}
$("clearClips").addEventListener("click", ()=>{
  if(exporting || !segments.length) return;
  if(segments.length>1 && !confirm("Remove all "+segments.length+" clips from the list?")) return;
  segments=[]; activeSeg=-1; refresh();
});

function renderClips(){
  const wrap=$("clipsWrap"), list=$("clipList");
  wrap.style.display = (!picMode && segments.length) ? "block" : "none";
  if(picMode){ list.innerHTML=""; return; }
  $("clipsTitle").textContent = "Clip list ("+segments.length+")";
  if(!segments.length){ list.innerHTML=""; return; }
  if(list.querySelector("input:focus")) return;     // don't yank a field being typed in

  list.innerHTML="";
  segments.forEach((s,i)=>{
    const row=document.createElement("div");
    row.className="crow"+(i===activeSeg?" on":"");

    const num=document.createElement("span"); num.className="cnum"; num.textContent=(i+1);

    const nameWrap=document.createElement("span"); nameWrap.className="cname";
    const name=document.createElement("input");
    name.type="text"; name.value=s.name||""; name.placeholder="name (optional)"; name.maxLength=40;
    name.addEventListener("input", ()=>{ s.name=name.value; });
    name.addEventListener("keydown", ev=>{ ev.stopPropagation(); if(ev.key==="Enter") name.blur(); });
    name.addEventListener("click", ev=>ev.stopPropagation());
    nameWrap.appendChild(name);

    const times=document.createElement("span"); times.className="ctimes";
    const bS=document.createElement("b"); bS.className="edit"; bS.textContent=tc(s.start);
    const bE=document.createElement("b"); bE.className="edit"; bE.textContent=tc(s.end);
    times.appendChild(bS); times.appendChild(document.createTextNode(" → ")); times.appendChild(bE);
    makeTimeEditor(bS, ()=>s.start, v=>{ s.start = clamp(v, 0, s.end-0.02); });
    makeTimeEditor(bE, ()=>s.end,   v=>{ s.end   = clamp(v, s.start+0.02, dur); });

    const d=document.createElement("span"); d.className="cdur"; d.textContent=tc(s.end-s.start);

    const btns=document.createElement("span"); btns.className="cbtns";
    const prev=document.createElement("button");
    prev.textContent="▶"; prev.title="Load this clip onto the timeline and play it";
    prev.addEventListener("click", ev=>{ ev.stopPropagation();
      if(exporting) return;
      activeSeg=i; inT=s.start; outT=s.end; V.currentTime=s.start; refresh();
      V.play().catch(()=>{}); });
    const use=document.createElement("button");
    use.textContent="Set"; use.title="Replace this clip's start and end with the current timeline selection";
    use.addEventListener("click", ev=>{ ev.stopPropagation();
      if(exporting) return;
      s.start=inT; s.end=outT; activeSeg=i; refresh(); });
    const del=document.createElement("button");
    del.textContent="✕"; del.title="Remove this clip"; del.className="danger";
    del.addEventListener("click", ev=>{ ev.stopPropagation();
      if(exporting) return;
      segments.splice(i,1);
      if(activeSeg>=segments.length) activeSeg=segments.length-1;
      refresh(); });
    btns.appendChild(prev); btns.appendChild(use); btns.appendChild(del);

    row.appendChild(num); row.appendChild(nameWrap); row.appendChild(times);
    row.appendChild(d); row.appendChild(btns);
    row.addEventListener("click", ()=>{           // preview this clip on the timeline
      if(exporting) return;
      activeSeg=i; inT=s.start; outT=s.end; V.currentTime=s.start; refresh();
    });
    list.appendChild(row);
  });
}

function renderBand(){
  const band=$("segBand"); band.innerHTML="";
  if(!dur) return;
  segments.forEach((s,i)=>{
    const el=document.createElement("div");
    el.className="segbar"+(i===activeSeg?" on":"");
    el.style.left=(s.start/dur*100)+"%";
    el.style.width=Math.max(0.4,(s.end-s.start)/dur*100)+"%";
    el.textContent=(i+1);
    band.appendChild(el);
  });
}

/* the list is what gets exported; with an empty list it's just the selection */
function exportList(){
  return segments.length ? segments.map(s=>({start:s.start,end:s.end,name:s.name}))
                         : [{start:inT,end:outT,name:""}];
}
function totalLen(){ return exportList().reduce((a,s)=>a+Math.max(0,s.end-s.start),0); }

/* ---------------- crop ----------------
   Held in source pixels so it survives any output size change. Everything that
   sizes the output asks srcW()/srcH() rather than the video's own dimensions. */
let crop=null, cropAR=0, cropARLabel="free", curScale=1;
function srcW(){ return crop ? crop.w : natW; }
function srcH(){ return crop ? crop.h : natH; }
function drawSource(dctx, dw, dh){
  dctx.imageSmoothingEnabled=true; dctx.imageSmoothingQuality="high";
  if(crop) dctx.drawImage(V, crop.x, crop.y, crop.w, crop.h, 0, 0, dw, dh);
  else     dctx.drawImage(V, 0, 0, dw, dh);
}

function videoBox(){
  const st=$("stage").getBoundingClientRect(), v=V.getBoundingClientRect();
  return {left:v.left-st.left, top:v.top-st.top, w:v.width, h:v.height};
}
function layoutCrop(){
  if(!crop || !natW) return;
  const L=$("cropLayer"), b=videoBox();
  if(!b.w || !b.h) return;
  L.style.left=b.left+"px"; L.style.top=b.top+"px";
  L.style.width=b.w+"px";   L.style.height=b.h+"px";
  const sx=b.w/natW, sy=b.h/natH, B=$("cropBox");
  B.style.left=(crop.x*sx)+"px";  B.style.top=(crop.y*sy)+"px";
  B.style.width=(crop.w*sx)+"px"; B.style.height=(crop.h*sy)+"px";
  $("cropDims").textContent = Math.round(crop.w)+" × "+Math.round(crop.h);
}
function cropChanged(finalise){
  if(crop){
    crop.x=Math.max(0,Math.round(crop.x)); crop.y=Math.max(0,Math.round(crop.y));
    crop.w=Math.min(Math.round(crop.w), natW-crop.x);
    crop.h=Math.min(Math.round(crop.h), natH-crop.y);
  }
  layoutCrop();
  $("cropInfo").textContent = crop
    ? "Keeping "+crop.w+" × "+crop.h+" ("+cropARLabel+") out of "+natW+" × "+natH+" · drag the box or its handles"
    : "";
  if(finalise){                        // only resize the output once the drag ends
    if(curScale){ W.value=even(srcW()*curScale); H.value=even(srcH()*curScale); markScale(curScale); }
    else if(lock.checked){ H.value=even((+W.value||srcW())*srcH()/srcW()); }
  }
  estimate();
}
function setCrop(x,y,w,h){
  w=Math.max(16,Math.min(w,natW)); h=Math.max(16,Math.min(h,natH));
  crop={x:clamp(x,0,natW-w), y:clamp(y,0,natH-h), w, h};
}
function snapToAR(ar){
  if(!ar || !crop) return;
  const cx=crop.x+crop.w/2, cy=crop.y+crop.h/2;
  let w=Math.min(natW, Math.max(crop.w, crop.h*ar)), h=w/ar;
  if(h>natH){ h=natH; w=h*ar; }
  setCrop(cx-w/2, cy-h/2, w, h);
}
function biggestFit(ar){
  let w=natW, h=natW/(ar||natW/natH);
  if(h>natH){ h=natH; w=h*(ar||natW/natH); }
  setCrop((natW-w)/2, (natH-h)/2, w, h);
}

function showCrop(on){
  $("cropLayer").style.display = on ? "block" : "none";
  $("cropSection").style.display = on ? "block" : "none";
  $("cropBtn").classList.toggle("on", on);
}
$("cropBtn").addEventListener("click", toggleCrop);
function toggleCrop(){
  if(exporting || !dur) return;
  if(crop){ removeCrop(); return; }
  if(cropAR) biggestFit(cropAR);
  else setCrop(natW*0.1, natH*0.1, natW*0.8, natH*0.8);
  showCrop(true); markAR(); cropChanged(true);
}
function removeCrop(){
  crop=null; cropAR=0; cropARLabel="free";
  showCrop(false);
  if(curScale){ W.value=even(natW*curScale); H.value=even(natH*curScale); markScale(curScale); }
  $("cropInfo").textContent="";
  estimate();
}
$("cropMax").addEventListener("click", ()=>{ if(!crop) return; biggestFit(cropAR||natW/natH); cropChanged(true); });

function applyAR(ar, label){
  cropAR = ar; cropARLabel = label;
  markAR();
  if(cropAR) snapToAR(cropAR);
  cropChanged(true);
}
document.querySelectorAll(".arRow").forEach(row=>{
  row.addEventListener("click", e=>{
    const b=e.target.closest("button"); if(!b || !crop) return;
    const v=b.dataset.ar;
    applyAR(v==="src" ? natW/natH : parseFloat(v), v==="src" ? "original" : b.dataset.lbl);
  });
});
function useCustomAR(){
  if(!crop) return;
  const a=+$("arW").value, b=+$("arH").value;
  if(!(a>0) || !(b>0)){ $("arW").focus(); return; }
  applyAR(a/b, a+":"+b);
}
$("arApply").addEventListener("click", useCustomAR);
["arW","arH"].forEach(id=>$(id).addEventListener("keydown", e=>{
  e.stopPropagation();
  if(e.key==="Enter"){ e.preventDefault(); useCustomAR(); }
}));
function markAR(){
  let matched=false;
  document.querySelectorAll(".arRow button").forEach(b=>{
    const v=b.dataset.ar, val = v==="src" ? (natW/natH) : parseFloat(v);
    const on = (!cropAR && v==="0") || (cropAR>0 && Math.abs(val-cropAR) < 0.004);
    b.classList.toggle("on", on);
    if(on) matched=true;
  });
  $("arCustom").classList.toggle("on", !matched && cropAR>0);
}

let cropDrag=null;
$("cropLayer").addEventListener("pointerdown", e=>{
  const h=e.target.dataset.h;
  if(!h || exporting || !crop) return;
  e.preventDefault();
  const b=videoBox();
  cropDrag={h, s:{...crop}, px:e.clientX, py:e.clientY, sx:b.w/natW, sy:b.h/natH};
  $("cropLayer").setPointerCapture(e.pointerId);
});
$("cropLayer").addEventListener("pointermove", e=>{
  if(!cropDrag) return;
  const dx=(e.clientX-cropDrag.px)/cropDrag.sx, dy=(e.clientY-cropDrag.py)/cropDrag.sy;
  const s=cropDrag.s, H=cropDrag.h, ar=cropAR;
  if(H==="move"){
    setCrop(s.x+dx, s.y+dy, s.w, s.h);
  }else if(ar){
    if(H==="n"||H==="s"){
      let hh = H==="n" ? s.h-dy : s.h+dy;
      hh=Math.max(16,Math.min(hh,natH)); let ww=hh*ar;
      if(ww>natW){ ww=natW; hh=ww/ar; }
      const cx=s.x+s.w/2, y = H==="n" ? (s.y+s.h)-hh : s.y;
      setCrop(cx-ww/2, y, ww, hh);
    }else if(H==="e"||H==="w"){
      let ww = H==="w" ? s.w-dx : s.w+dx;
      ww=Math.max(16,Math.min(ww,natW)); let hh=ww/ar;
      if(hh>natH){ hh=natH; ww=hh*ar; }
      const cy=s.y+s.h/2, x = H==="w" ? (s.x+s.w)-ww : s.x;
      setCrop(x, cy-hh/2, ww, hh);
    }else{                                        // corner: opposite corner stays put
      const west=H.indexOf("w")>=0, north=H.indexOf("n")>=0;
      const ax = west ? s.x+s.w : s.x, ay = north ? s.y+s.h : s.y;
      const availW = west ? ax : natW-ax, availH = north ? ay : natH-ay;
      let ww = Math.max(west ? s.w-dx : s.w+dx, (north ? s.h-dy : s.h+dy)*ar);
      ww = Math.max(16, Math.min(ww, availW, availH*ar));
      const hh = ww/ar;
      setCrop(west ? ax-ww : ax, north ? ay-hh : ay, ww, hh);
    }
  }else{
    let l=s.x, tp=s.y, r=s.x+s.w, bt=s.y+s.h;
    if(H.indexOf("w")>=0) l=clamp(s.x+dx, 0, r-16);
    if(H.indexOf("e")>=0) r=clamp(s.x+s.w+dx, l+16, natW);
    if(H.indexOf("n")>=0) tp=clamp(s.y+dy, 0, bt-16);
    if(H.indexOf("s")>=0) bt=clamp(s.y+s.h+dy, tp+16, natH);
    setCrop(l, tp, r-l, bt-tp);
  }
  cropChanged(false);
});
["pointerup","pointercancel"].forEach(ev=>$("cropLayer").addEventListener(ev, ()=>{
  if(cropDrag){ cropDrag=null; cropChanged(true); }
}));
window.addEventListener("resize", layoutCrop);
if(window.ResizeObserver) new ResizeObserver(layoutCrop).observe($("stage"));
V.addEventListener("loadeddata", layoutCrop);

/* ---------------- size ---------------- */
const W=$("w"), H=$("h"), lock=$("lockAr");
$("scaleSeg").addEventListener("click", e=>{
  const b=e.target.closest("button"); if(!b) return;
  const s=parseFloat(b.dataset.s);
  W.value=even(srcW()*s); H.value=even(srcH()*s); markScale(s); estimate();
});
function markScale(s){
  curScale = s;
  [...$("scaleSeg").children].forEach(b=>b.classList.toggle("on", parseFloat(b.dataset.s)===s));
}
W.addEventListener("input", ()=>{ if(lock.checked && srcW()) H.value=even(W.value*srcH()/srcW()); markScale(null); estimate(); });
H.addEventListener("input", ()=>{ if(lock.checked && srcH()) W.value=even(H.value*srcW()/srcH()); markScale(null); estimate(); });

/* ---------------- fps ---------------- */
function buildFpsSeg(){
  const seg=$("fpsSeg"); seg.innerHTML="";
  const opts=[Math.round(srcFps),60,30,24,15,12].filter((v,i,a)=>v<=Math.max(60,Math.round(srcFps))&&a.indexOf(v)===i);
  opts.forEach(f=>{
    const b=document.createElement("button");
    b.textContent = (f===Math.round(srcFps)? "Same ("+f+")" : f);
    b.dataset.f=f;
    b.addEventListener("click",()=>{ $("fps").value=f; markFps(); estimate(); });
    seg.appendChild(b);
  });
  markFps();
}
function markFps(){
  const f=+$("fps").value;
  [...$("fpsSeg").children].forEach(b=>b.classList.toggle("on", +b.dataset.f===f));
}
$("fps").addEventListener("input", ()=>{ markFps(); estimate(); });

/* ---------------- collapsible sections ---------------- */
$("sizeHead").addEventListener("click", ()=>{
  const open = $("sizeHead").classList.toggle("open");
  $("sizeHead").classList.toggle("shut", !open);
  $("sizeBody").style.display = open ? "block" : "none";
});

/* ---------------- tabs ---------------- */
let picMode = false;
$("tabs").addEventListener("click", e=>{
  const b=e.target.closest("button"); if(!b) return;
  const t=b.dataset.tab;
  [...$("tabs").children].forEach(x=>x.classList.toggle("on", x===b));
  $("tabVideo").style.display = t==="video" ? "block" : "none";
  $("tabPic").style.display   = t==="pic"   ? "block" : "none";
  picMode = (t==="pic");
  syncMode();
});
/* The two buttons under the timeline do different jobs depending on the tab:
   clips for video, individual frames for the manual storyboard. */
function syncMode(){
  $("addClip").innerHTML = (picMode ? "+ Add snapshot" : "+ Add clip")
                         + ' &nbsp;<span class="kbd" style="background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25)">A</span>';
  $("resetSel").textContent = picMode ? "Reset storyboard" : "Reset to full clip";
  $("keyA").textContent = picMode ? "add snapshot" : "add clip";
  refresh();
}

/* ---------------- compression / estimate ---------------- */
$("q").addEventListener("input", estimate);
$("keepAudio").addEventListener("change", estimate);
["sbCols","sbRows","imgMax","msCols","msRows"].forEach(id=>$(id).addEventListener("input", ()=>{ estimate(); renderSnaps(); }));
/* bits per pixel per frame. The browser's recorder is a realtime encoder, so it
   needs noticeably more bitrate than an offline one to look the same. At the
   78 default this is ~7 Mbps for 720p30 and ~16 Mbps for 1080p30. */
function qualityBpp(){
  const q=+$("q").value/100;
  return 0.035 * Math.pow(0.55/0.035, q);        // 0.035 → 0.55
}
function targets(){
  const w=even(clamp(+W.value||srcW(),16,7680)), h=even(clamp(+H.value||srcH(),16,4320));
  const f=clamp(+$("fps").value||Math.round(srcFps),1,120);
  const bitrate=Math.round(clamp(w*h*f*qualityBpp(), 250000, 120000000));
  return {w,h,f,bitrate};
}
function estimate(){
  const t=targets(), n=exportList().length, len=totalLen();
  $("eSize").textContent = t.w+"×"+t.h;
  $("eRate").textContent = (t.bitrate/1e6).toFixed(2)+" Mbps";
  $("eBytesLbl").textContent = n>1 ? "Est. size, all "+n : "Est. file size";
  $("eCodec").textContent = codecLabel();
  $("eBytes").textContent = bytes(t.bitrate*len/8 + (wantAudio()?192000:0)*len/8);
  $("eTime").textContent = len<1 ? "—" : (len<60? Math.ceil(len)+" s" : Math.ceil(len/60)+" min");
  const q=+$("q").value;
  $("qHint").textContent = (q<20?"Squeezed hard — smallest file, softest picture"
                          : q<40?"Well compressed — easy to email"
                          : q<60?"Balanced"
                          : q<80?"Light compression — larger file, crisper picture"
                          : "Barely compressed — largest file");
  const gfit = fitWithin(t.w, t.h, imgCap());
  $("imgMaxHint").textContent = "Pictures are scaled to fit inside this. A single frame comes out "
    + gfit.w + " × " + gfit.h + (gfit.scale<1 ? " (scaled down from "+t.w+" × "+t.h+")" : "") + ".";
  $("sizeHint").textContent = (crop ? "Cropped to "+crop.w+"×"+crop.h+" (from "+natW+"×"+natH+")."
                                     : "Source "+natW+"×"+natH+".")+" Width and height are rounded to even numbers.";
  $("exportBtn").textContent = n>1 ? "Export "+n+" clips" : (segments.length===1 ? "Export 1 clip" : "Export clip");
  $("gifBtn").textContent = n>1 ? "Export "+n+" GIFs" : "Export as GIF";
  const g = sbGrid(), cell = sbCell(t, g.c, g.r), frames = g.c*g.r;
  $("sbHint").textContent = frames+" frame"+(frames===1?"":"s")+" · sheet "
    + (g.c*cell.cw + (g.c-1)*SB_GAP) + " × " + (g.r*cell.ch + (g.r-1)*SB_GAP) + " px";
  $("sbBtn").textContent = n>1 ? "Export "+n+" storyboards" : "Export storyboard";
  const mg = msGrid(), mcell = sbCell(t, mg.c, mg.r), cells = mg.c*mg.r;
  $("msHint").textContent = snaps.length
    ? snaps.length+" snapshot"+(snaps.length===1?"":"s")+" · "+cells+" cell"+(cells===1?"":"s")
      + (snaps.length>cells ? " · "+(snaps.length-cells)+" won't fit"
         : snaps.length<cells ? " · "+(cells-snaps.length)+" left blank" : "")
      + " · sheet "+(mg.c*mcell.cw+(mg.c-1)*SB_GAP)+" × "+(mg.r*mcell.ch+(mg.r-1)*SB_GAP)+" px"
    : "No snapshots yet — press + Add snapshot under the video.";
}

/* ---------------- recording engine ---------------- */
/* H.264 High profile first — Baseline (the old default) has no CABAC and no
   B-frames, which is a big quality loss at the same bitrate. Level 5.2 so 4K
   is inside the profile limits. */
const MIMES = [
  "video/mp4;codecs=avc1.640034,mp4a.40.2",   // High 5.2
  "video/mp4;codecs=avc1.64002A,mp4a.40.2",   // High 4.2
  "video/mp4;codecs=avc1.4D402A,mp4a.40.2",   // Main 4.2
  "video/mp4;codecs=avc1.640034",
  "video/mp4",
  "video/webm;codecs=vp9,opus",
  "video/webm;codecs=vp9",
  "video/webm;codecs=vp8,opus",
  "video/webm"
];
function pickMime(){
  for(const m of MIMES) if(window.MediaRecorder && MediaRecorder.isTypeSupported(m)) return m;
  return "";
}
function codecLabel(){
  const m = pickMime();
  if(!m) return "none";
  if(/avc1\.64/.test(m)) return "H.264 High";
  if(/avc1\.4D/.test(m)) return "H.264 Main";
  if(/avc1/.test(m))      return "H.264";
  if(/mp4/.test(m))       return "MP4";
  if(/vp9/.test(m))       return "VP9";
  if(/vp8/.test(m))       return "VP8";
  return m;
}
function wantAudio(){ const c=$("keepAudio"); return !c || c.checked; }
function setupAudio(){
  if(audioCtx) return;
  try{
    audioCtx = new (window.AudioContext||window.webkitAudioContext)();
    mediaSrc = audioCtx.createMediaElementSource(V);
    monitorGain = audioCtx.createGain(); monitorGain.gain.value = 1;
    mediaSrc.connect(monitorGain); monitorGain.connect(audioCtx.destination);
    streamDest = audioCtx.createMediaStreamDestination();
    mediaSrc.connect(streamDest);
  }catch(e){ audioCtx=null; }
}

/* records V from `a` to `z` onto the export canvas; resolves with {blob,ext,stalled,speed} */
/* A clock that keeps ticking when the tab is in the background.

   The bug this fixes: the whole export used to run inside requestAnimationFrame.
   Chrome stops firing rAF when a tab is hidden (or the window is fully covered),
   so the canvas was never repainted and the "we've reached the end, stop now"
   check never ran. Result: one frozen video frame plus audio, recording on until
   the source video ended. Web Audio runs on a realtime thread the browser does
   not throttle, so it drives things now; rAF and a timer are extra safety. */
function makeClock(fn){
  const stops=[];
  try{
    if(audioCtx && audioCtx.createScriptProcessor){
      const node = audioCtx.createScriptProcessor(1024, 1, 1);   // ~21 ms, ~47 Hz
      const mute = audioCtx.createGain(); mute.gain.value = 0;
      node.onaudioprocess = ()=>fn();
      node.connect(mute); mute.connect(audioCtx.destination);
      stops.push(()=>{ node.onaudioprocess=null; try{ node.disconnect(); mute.disconnect(); }catch(e){} });
    }
  }catch(e){}
  if(typeof requestAnimationFrame === "function"){
    let alive=true, raf=0;
    const loop=()=>{ if(!alive) return; fn(); raf=requestAnimationFrame(loop); };
    raf=requestAnimationFrame(loop);
    stops.push(()=>{ alive=false; try{ cancelAnimationFrame(raf); }catch(e){} });
  }
  const id=setInterval(fn, 60);
  stops.push(()=>clearInterval(id));
  return ()=>stops.forEach(f=>{ try{ f(); }catch(e){} });
}

let wakeLock=null;
async function keepAwake(on){
  try{
    if(on && navigator.wakeLock && !wakeLock){ wakeLock = await navigator.wakeLock.request("screen"); }
    else if(!on && wakeLock){ await wakeLock.release(); wakeLock=null; }
  }catch(e){ wakeLock=null; }
}

async function recordRange(a, z, t, mime, ctx, cv, onProg){
  const len = Math.max(0.02, z-a);

  // Let the canvas sample on its own clock. Driving frames by hand with
  // requestFrame() was tried and measured worse: roughly one run in three came
  // out badly short (0.85 s for a 2.00 s clip), whereas this is consistent.
  const cStream = cv.captureStream(t.f);
  // Tell the encoder to favour a sharp picture over smoothing. Measured free:
  // +1.0 dB PSNR and it holds the target frame rate better, at the same file size.
  try{ const vtrk = cStream.getVideoTracks()[0]; if(vtrk) vtrk.contentHint = "detail"; }catch(e){}

  const tracks = [...cStream.getVideoTracks()];
  if(streamDest && wantAudio()) tracks.push(...streamDest.stream.getAudioTracks());
  const stream = new MediaStream(tracks);

  let rec;
  try{ rec = new MediaRecorder(stream, {mimeType:mime, videoBitsPerSecond:t.bitrate, audioBitsPerSecond:192000}); }
  catch(e){ rec = new MediaRecorder(stream, {mimeType:mime}); }

  const chunks=[];
  rec.ondataavailable = e => { if(e.data && e.data.size) chunks.push(e.data); };
  const stopped = new Promise(r => rec.onstop = r);

  const paintFrame = ()=> drawSource(ctx, t.w, t.h);

  V.currentTime = a;
  await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,5000))]);
  drawSource(ctx, t.w, t.h);

  let stopClock=null, stopping=false, stalled=false, aborted=false;
  let wall0=0, media0=a, stopAt=z, speed=1, pausedTotal=0, pausedAt=0, hiddenPaused=false;
  let lastT=V.currentTime, stallMs=0, prevNow=performance.now();
  const paintFloor = Math.max(16, 1000/Math.max(1,t.f));
  let lastPaint = 0, vfcOn = false;
  const maxMs = len*1000*3 + 8000;          // a clip can never run away, whatever else breaks

  const stop = (immediate)=>{
    const el=(performance.now()-wall0-pausedTotal)/1000;
    if(el>0.2) speed=(V.currentTime-media0)/el;
    V.pause();
    const finish = ()=>{
      if(stopClock){ stopClock(); stopClock=null; }
      try{ rec.stop(); }catch(e){}
    };
    // Hold on the last frame briefly before cutting the recorder. Without it the
    // final frame gets no screen time and a 10.000 s clip lands at 9.999 s —
    // which most players display as 0:09.
    if(immediate) finish();
    else setTimeout(finish, Math.max(110, 2000/Math.max(1,t.f)));
  };

  // Chrome may stop decoding video for a hidden tab, so recording while hidden
  // can't be trusted. Pause instead and pick up where we left off.
  const onVis = ()=>{
    if(stopping) return;
    if(document.hidden && !hiddenPaused){
      hiddenPaused=true; pausedAt=performance.now();
      try{ V.pause(); }catch(e){}
      try{ if(rec.state==="recording") rec.pause(); }catch(e){}
      setStatus("Paused — come back to this tab to carry on exporting");
    }else if(!document.hidden && hiddenPaused){
      hiddenPaused=false; pausedTotal += performance.now()-pausedAt;
      prevNow=performance.now(); lastPaint=0;
      try{ if(rec.state==="paused") rec.resume(); }catch(e){}
      V.play().catch(()=>{});
      keepAwake(true);
    }
  };
  document.addEventListener("visibilitychange", onVis);

  const tick = ()=>{
    if(stopping || hiddenPaused) return;
    const now=performance.now();
    if(!vfcOn || now-lastPaint > paintFloor){ paintFrame(); lastPaint = now; }
    if(Math.abs(V.currentTime-lastT)>0.001){ lastT=V.currentTime; stallMs=0; } else { stallMs += now-prevNow; }
    prevNow=now;
    if(onProg) onProg(clamp((V.currentTime-a)/len,0,1), Math.max(0,len-(V.currentTime-a)));
    if(cancelExport || V.currentTime >= stopAt || V.ended ||
       stallMs > 10000 || (now-wall0-pausedTotal) > maxMs){
      stopping=true;
      if(cancelExport) aborted=true;              // half a clip is worse than none
      if(stallMs>10000 || (now-wall0-pausedTotal)>maxMs) stalled=true;
      stop(cancelExport || V.ended);
    }
  };
  const onEnded = ()=>{ if(!stopping){ stopping=true; stop(true); } };
  V.addEventListener("ended", onEnded);

  // start playback FIRST, then the recorder — otherwise the frozen first frame
  // gets baked into the front of the clip and the output runs long
  V.playbackRate = 1;
  try{ await V.play(); }
  catch(e){
    document.removeEventListener("visibilitychange", onVis);
    V.removeEventListener("ended",onEnded);
    try{ cStream.getTracks().forEach(x=>x.stop()); }catch(e2){}
    throw new Error("Couldn't start playback: "+e.message);
  }
  // Measure the end point from where the recorder actually began, not from the
  // mark. play() resolves a few ms after the video starts moving, and that gap
  // used to come straight off the length of the clip.
  wall0 = performance.now(); media0 = V.currentTime;
  stopAt = Math.min(dur, media0 + len);
  prevNow = wall0; lastPaint = 0;
  if("requestVideoFrameCallback" in HTMLVideoElement.prototype){
    vfcOn = true;
    const vfc = ()=>{ if(stopping) return; paintFrame(); lastPaint=performance.now();
                      try{ V.requestVideoFrameCallback(vfc); }catch(e){} };
    try{ V.requestVideoFrameCallback(vfc); }catch(e){ vfcOn=false; }
  }
  rec.start(200);
  stopClock = makeClock(tick);

  await stopped;
  if(stopClock){ stopClock(); stopClock=null; }
  document.removeEventListener("visibilitychange", onVis);
  V.removeEventListener("ended", onEnded);
  try{ cStream.getTracks().forEach(x=>x.stop()); }catch(e){}

  const type = mime.split(";")[0];
  return { blob:new Blob(chunks,{type}), ext:(type.indexOf("mp4")>=0?"mp4":"webm"), stalled, speed, aborted };
}

/* ---------------- GIF encoder ----------------
   Written out longhand so the file stays self-contained and works offline.
   GIF is limited to 256 colours per frame, so each frame gets its own palette
   (median cut) and Floyd-Steinberg dithering to stop gradients banding. */
const _hist=new Int32Array(32768), _rs=new Int32Array(32768), _gs=new Int32Array(32768), _bs=new Int32Array(32768);
const _bins=new Int32Array(32768), _cache=new Int16Array(32768);

function gifBytes(){
  let b=new Uint8Array(1<<18), n=0;
  const grow=k=>{ if(n+k<=b.length) return; let L=b.length; while(L<n+k) L*=2;
                  const t=new Uint8Array(L); t.set(b.subarray(0,n)); b=t; };
  return {
    u8(v){ grow(1); b[n++]=v&255; },
    u16(v){ grow(2); b[n++]=v&255; b[n++]=(v>>8)&255; },
    str(s){ grow(s.length); for(let i=0;i<s.length;i++) b[n++]=s.charCodeAt(i); },
    raw(a){ grow(a.length); b.set(a,n); n+=a.length; },
    size(){ return n; },
    out(){ return b.slice(0,n); }
  };
}

function buildPalette(data, maxColors){
  _hist.fill(0); _rs.fill(0); _gs.fill(0); _bs.fill(0);
  for(let i=0;i<data.length;i+=4){
    const r=data[i], g=data[i+1], b=data[i+2];
    const k=((r>>3)<<10)|((g>>3)<<5)|(b>>3);
    _hist[k]++; _rs[k]+=r; _gs[k]+=g; _bs[k]+=b;
  }
  let m=0; for(let k=0;k<32768;k++) if(_hist[k]) _bins[m++]=k;
  const stat=(s,e)=>{
    let rmin=31,rmax=0,gmin=31,gmax=0,bmin=31,bmax=0;
    for(let i=s;i<e;i++){ const k=_bins[i], r=(k>>10)&31, g=(k>>5)&31, b=k&31;
      if(r<rmin)rmin=r; if(r>rmax)rmax=r;
      if(g<gmin)gmin=g; if(g>gmax)gmax=g;
      if(b<bmin)bmin=b; if(b>bmax)bmax=b; }
    const dr=rmax-rmin, dg=gmax-gmin, db=bmax-bmin;
    let chan=0, ext=dr;
    if(dg>ext){ chan=1; ext=dg; }
    if(db>ext){ chan=2; ext=db; }
    return {s,e,chan,ext};
  };
  let boxes=[stat(0,m)];
  while(boxes.length<maxColors){
    let bi=-1, best=0;
    for(let i=0;i<boxes.length;i++){ const B=boxes[i];
      if(B.e-B.s<2) continue;
      if(B.ext>best){ best=B.ext; bi=i; } }
    if(bi<0) break;
    const B=boxes[bi], shift=B.chan===0?10:B.chan===1?5:0;
    const sub=Array.from(_bins.subarray(B.s,B.e));
    sub.sort((x,y)=>(((x>>shift)&31)-((y>>shift)&31)));
    _bins.set(sub,B.s);
    let total=0; for(let i=B.s;i<B.e;i++) total+=_hist[_bins[i]];
    let acc=0, mid=B.s+1;
    for(let i=B.s;i<B.e;i++){ acc+=_hist[_bins[i]]; if(acc*2>=total){ mid=i+1; break; } }
    if(mid<=B.s) mid=B.s+1;
    if(mid>=B.e) mid=B.e-1;
    boxes.splice(bi,1,stat(B.s,mid),stat(mid,B.e));
  }
  const pal=new Uint8Array(768);
  for(let i=0;i<boxes.length;i++){
    const B=boxes[i]; let c=0,R=0,G=0,Bl=0;
    for(let x=B.s;x<B.e;x++){ const k=_bins[x]; c+=_hist[k]; R+=_rs[k]; G+=_gs[k]; Bl+=_bs[k]; }
    if(c){ pal[i*3]=Math.round(R/c); pal[i*3+1]=Math.round(G/c); pal[i*3+2]=Math.round(Bl/c); }
  }
  return {pal, count:Math.max(1,boxes.length)};
}

function mapToPalette(data, w, h, pal, palCount, dither){
  const idx=new Uint8Array(w*h);
  _cache.fill(-1);
  const nearest=(r,g,b)=>{
    const key=((r>>3)<<10)|((g>>3)<<5)|(b>>3);
    const hit=_cache[key]; if(hit>=0) return hit;
    let bd=Infinity, bi=0;
    for(let i=0;i<palCount;i++){
      const dr=r-pal[i*3], dg=g-pal[i*3+1], db=b-pal[i*3+2];
      const d=dr*dr*3+dg*dg*6+db*db;              // roughly luma-weighted
      if(d<bd){ bd=d; bi=i; }
    }
    _cache[key]=bi; return bi;
  };
  if(!dither){
    for(let p=0,q=0;q<idx.length;q++,p+=4) idx[q]=nearest(data[p],data[p+1],data[p+2]);
    return idx;
  }
  const buf=new Float32Array(w*h*3);
  for(let p=0,q=0;q<w*h;q++,p+=4){ buf[q*3]=data[p]; buf[q*3+1]=data[p+1]; buf[q*3+2]=data[p+2]; }
  const cl=v=>v<0?0:(v>255?255:v);
  for(let y=0;y<h;y++){
    for(let x=0;x<w;x++){
      const q=y*w+x, o=q*3;
      const r=cl(buf[o]), g=cl(buf[o+1]), b=cl(buf[o+2]);
      const i=nearest(r|0,g|0,b|0); idx[q]=i;
      const er=(r-pal[i*3])*0.75, eg=(g-pal[i*3+1])*0.75, eb=(b-pal[i*3+2])*0.75;
      if(x+1<w){ const oo=(q+1)*3; buf[oo]+=er*0.4375; buf[oo+1]+=eg*0.4375; buf[oo+2]+=eb*0.4375; }
      if(y+1<h){
        if(x>0){ const oo=(q+w-1)*3; buf[oo]+=er*0.1875; buf[oo+1]+=eg*0.1875; buf[oo+2]+=eb*0.1875; }
        { const oo=(q+w)*3; buf[oo]+=er*0.3125; buf[oo+1]+=eg*0.3125; buf[oo+2]+=eb*0.3125; }
        if(x+1<w){ const oo=(q+w+1)*3; buf[oo]+=er*0.0625; buf[oo+1]+=eg*0.0625; buf[oo+2]+=eb*0.0625; }
      }
    }
  }
  return idx;
}

function lzwWrite(minCodeSize, indices, g){
  const CLEAR=1<<minCodeSize, EOI=CLEAR+1;
  let codeSize=minCodeSize+1, next=EOI+1;
  let dict=new Map(), cur=0, curBits=0;
  const block=[];
  const flush=()=>{ if(block.length){ g.u8(block.length); for(let i=0;i<block.length;i++) g.u8(block[i]); block.length=0; } };
  const emit=code=>{
    cur |= code<<curBits; curBits += codeSize;
    while(curBits>=8){ block.push(cur&255); cur>>>=8; curBits-=8; if(block.length===255) flush(); }
  };
  g.u8(minCodeSize);
  emit(CLEAR);
  let prefix=indices[0];
  for(let i=1;i<indices.length;i++){
    const k=indices[i], key=prefix*256+k, found=dict.get(key);
    if(found!==undefined){ prefix=found; continue; }
    emit(prefix);
    if(next===4096){
      emit(CLEAR); dict=new Map(); next=EOI+1; codeSize=minCodeSize+1;
    }else{
      // grow the code width BEFORE claiming the code, so the decoder — which
      // builds its table one code behind — switches width at the same place
      if(next >= (1<<codeSize) && codeSize<12) codeSize++;
      dict.set(key,next); next++;
    }
    prefix=k;
  }
  emit(prefix); emit(EOI);
  if(curBits>0){ block.push(cur&255); if(block.length===255) flush(); }
  flush();
  g.u8(0);
}

function whileVisible(){
  if(!document.hidden) return Promise.resolve();
  setStatus("Paused — come back to this tab to carry on");
  return new Promise(res=>{
    const h=()=>{ if(!document.hidden){ document.removeEventListener("visibilitychange",h); res(); } };
    document.addEventListener("visibilitychange",h);
  });
}

/* Renders by seeking frame by frame rather than playing in real time, so it is
   exact and doesn't care how fast the machine is. */
async function renderGif(a, z, t, ctx, cv, onProg){
  const len=Math.max(0.02, z-a);
  const gf = clamp(Math.round(+$("gfps").value||10), 1, 20);
  const delay = Math.max(2, Math.round(100/gf));                // GIF delays are in 1/100 s
  const fit = fitWithin(t.w, t.h, imgCap());
  const w=fit.w, h=fit.h;
  const n=Math.max(1, Math.min(900, Math.round(len*100/delay)));
  const g=gifBytes();
  g.str("GIF89a"); g.u16(w); g.u16(h); g.u8(0x70); g.u8(0); g.u8(0);
  g.u8(0x21); g.u8(0xFF); g.u8(11); g.str("NETSCAPE2.0"); g.u8(3); g.u8(1); g.u16(0); g.u8(0);  // loop forever

  let aborted=false, t0=performance.now();
  for(let i=0;i<n;i++){
    if(cancelExport){ aborted=true; break; }
    await whileVisible();
    V.currentTime = Math.min(z-0.001, a + i*delay/100);
    await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,3000))]);
    drawSource(ctx, w, h);
    const img=ctx.getImageData(0,0,w,h);
    const {pal,count}=buildPalette(img.data, 256);
    const idx=mapToPalette(img.data, w, h, pal, count, true);
    g.u8(0x21); g.u8(0xF9); g.u8(4); g.u8(0x04); g.u16(delay); g.u8(0); g.u8(0);
    g.u8(0x2C); g.u16(0); g.u16(0); g.u16(w); g.u16(h); g.u8(0x87);
    g.raw(pal);
    lzwWrite(8, idx, g);
    if(onProg){
      const per=(performance.now()-t0)/(i+1)/1000;
      onProg((i+1)/n, Math.max(0,(n-i-1)*per));
    }
    if((i&1)===0) await new Promise(r=>setTimeout(r,0));       // keep the page responsive
  }
  g.u8(0x3B);
  return { blob:new Blob([g.out()],{type:"image/gif"}), ext:"gif", stalled:false, speed:1, aborted,
           frames:n, fps:Math.round(1000/delay)/10 };
}

/* ---------------- snapshot ----------------
   Grabs whatever frame is currently on screen — same crop and output size as
   the video/GIF export — and saves it as a PNG. No recording involved, so
   it's instant. */
function takeSnapshot(){
  if(exporting || !dur) return;
  const t = targets();
  const fit = fitWithin(t.w, t.h, imgCap());
  const cv = $("exportCanvas"); cv.width=fit.w; cv.height=fit.h;
  const ctx = cv.getContext("2d", {alpha:false});
  ctx.imageSmoothingEnabled=true; ctx.imageSmoothingQuality="high";
  drawSource(ctx, fit.w, fit.h);
  cv.toBlob(blob=>{
    if(!blob || !blob.size){ setStatus("Couldn't capture that frame."); return; }
    const base = safeName(srcName,60) || "clip";
    const name = base+"_"+stamp(V.currentTime)+"_"+fit.w+"x"+fit.h+".png";
    pushDownload(blob, name);
    setStatus("Saved "+name);
  }, "image/png");
}

/* ---------------- storyboard ----------------
   Nine frames spread evenly from the start of the selection to its end, laid out
   left to right then down, with a 2px gap between them. Built by seeking rather
   than playing, so it takes a couple of seconds whatever the clip length. */
const SB_GAP = 2;
/* One ceiling for every picture export: nothing comes out with a side longer
   than this, however big the video or the storyboard grid is. */
function imgCap(){ return clamp(Math.round(+$("imgMax").value||1920), 64, 8000); }
function fitWithin(w, h, m){
  const s = Math.min(1, m/Math.max(w,h));
  return {w: Math.max(1,Math.round(w*s)), h: Math.max(1,Math.round(h*s)), scale:s};
}
function sbGrid(){
  const c = clamp(Math.round(+$("sbCols").value||3), 1, 10);
  const r = clamp(Math.round(+$("sbRows").value||3), 1, 10);
  return {c, r};
}
function sbCell(t, cols, rows){
  // Size the cells from the space left AFTER the gaps, so the finished sheet
  // lands inside the ceiling rather than a few pixels over it.
  const m = imgCap(), ar = Math.max(0.01, t.w/t.h);
  let cw = Math.min(t.w, 800);
  cw = Math.min(cw, Math.floor((m - (cols-1)*SB_GAP) / cols));
  cw = Math.min(cw, Math.floor((m - (rows-1)*SB_GAP) / rows * ar));
  cw = Math.max(8, cw);
  let ch = Math.max(8, Math.round(cw/ar));
  for(let i=0;i<4 && rows*ch + (rows-1)*SB_GAP > m && ch > 8;i++){
    ch = Math.max(8, ch - Math.ceil((rows*ch + (rows-1)*SB_GAP - m)/rows));
    cw = Math.max(8, Math.round(ch*ar));
  }
  return {cw, ch};
}

/* Both storyboards paint the same kind of sheet — the only difference is where
   the frame times come from. */
async function composeSheet(times, COLS, ROWS, t, cv, onProg){
  const {cw, ch} = sbCell(t, COLS, ROWS);
  const W = COLS*cw + (COLS-1)*SB_GAP, H = ROWS*ch + (ROWS-1)*SB_GAP;
  cv.width = W; cv.height = H;
  const g = cv.getContext("2d", {alpha:false});
  g.imageSmoothingEnabled = true; g.imageSmoothingQuality = "high";
  g.fillStyle = "#ffffff"; g.fillRect(0,0,W,H);        // shows through as the 2px gaps

  const cells = Math.min(times.length, COLS*ROWS);
  for(let i=0;i<cells;i++){
    if(cancelExport) return {aborted:true};
    await whileVisible();
    V.currentTime = clamp(times[i], 0, Math.max(0, dur-0.001));
    await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,3000))]);
    const col = i % COLS, row = (i / COLS) | 0;         // across first, then down
    g.save();
    g.translate(col*(cw+SB_GAP), row*(ch+SB_GAP));
    drawSource(g, cw, ch);
    g.restore();
    if(onProg) onProg((i+1)/cells, Math.max(0,(cells-i-1)*0.35));
    await new Promise(r=>setTimeout(r,0));
  }
  return { blob: await new Promise(res=>cv.toBlob(res, "image/png")) };
}

/* evenly spaced from the start of the selection to its end */
async function renderStory(a, z, t, ctx, cv, onProg){
  const {c:C, r:R} = sbGrid(), count = C*R, span = Math.max(0, z-a);
  const times = [];
  for(let i=0;i<count;i++) times.push(count>1 ? a + span*i/(count-1) : a);
  times[count-1] = Math.min(times[count-1], z-0.001);
  const out = await composeSheet(times, C, R, t, cv, onProg);
  return { blob: out.blob || new Blob([]), ext:"png", stalled:false, speed:1, aborted:!!out.aborted };
}

/* exactly the frames you picked, in the order you picked them */
async function renderManual(a, z, t, ctx, cv, onProg){
  const {c:C, r:R} = msGrid();
  const out = await composeSheet(snaps.map(x=>x.t), C, R, t, cv, onProg);
  return { blob: out.blob || new Blob([]), ext:"png", stalled:false, speed:1, aborted:!!out.aborted };
}

/* ---------------- export ---------------- */
$("exportBtn").addEventListener("click", ()=>doExport("video"));
$("snapBtn").addEventListener("click", takeSnapshot);
$("gifBtn").addEventListener("click", ()=>doExport("gif"));
$("sbBtn").addEventListener("click", ()=>doExport("story"));
$("msBtn").addEventListener("click", ()=>doExport("manual"));
$("stopBtn").addEventListener("click", ()=>{ cancelExport=true; setStatus("Stopping…"); });

async function doExport(mode){
  if(exporting || !dur) return;
  const isGif = mode === "gif";
  const isStory = mode === "story";
  const isManual = mode === "manual";
  if(isManual && !snaps.length){
    setStatus("Add some snapshots first — park the playhead and press + Add snapshot.");
    return;
  }
  sheetKind = isManual ? "manual" : "auto";
  const t = targets();
  const list = isManual ? [{start:inT, end:outT, name:""}]
                        : exportList().filter(s => s.end - s.start >= 0.05);
  if(!list.length){ setStatus("Selection is too short."); return; }
  const multi = list.length > 1;
  const mime = isGif ? "image/gif" : (isStory||isManual) ? "image/png" : pickMime();
  if(!mime){ setStatus("This browser can't record video. Try Chrome or Edge."); return; }
  if(isStory||isManual) lastExt = "png";

  if(isGif){                       // GIFs balloon quickly — say so before spending the time
    const gfps = Math.min(20, t.f);
    const frames = Math.round(list.reduce((x,sg)=>x+(sg.end-sg.start),0) * gfps);
    if(t.w*t.h*frames > 90e6 &&
       !confirm("That's "+frames+" frames at "+t.w+"×"+t.h+", which will make a very large GIF and take a while.\n\nA smaller width or fewer frames per second would help.\n\nCarry on anyway?")) return;
  }

  // several files → put them in a folder of your choosing (must happen on the click)
  let dirHandle = null;
  if(multi && window.showDirectoryPicker){
    try{
      dirHandle = await window.showDirectoryPicker({id:"nugget-clips", mode:"readwrite", startIn:"videos"});
    }catch(e){
      if(e && e.name === "AbortError"){ setStatus("Export cancelled — no folder chosen."); return; }
      dirHandle = null;                    // not supported here; fall back to downloads
    }
  }

  exporting=true; cancelExport=false;
  clearResult(); clearSaved();
  $("exportBtn").disabled=true; $("gifBtn").disabled=true; $("snapBtn").disabled=true;
  $("sbBtn").disabled=true; $("msBtn").disabled=true;
  $("exportBtn").textContent = isGif ? "Building GIF…" : (isStory||isManual) ? "Building storyboard…" : "Exporting…";
  $("stopBtn").style.display="block";
  $("expNote").style.display="block";
  $("bar").style.display="block"; $("barI").style.width="0%";
  V.pause();

  const cv=$("exportCanvas"); cv.width=t.w; cv.height=t.h;
  const ctx=cv.getContext("2d",{alpha:false});
  ctx.imageSmoothingEnabled=true; ctx.imageSmoothingQuality="high";
  ctx.fillStyle="#000"; ctx.fillRect(0,0,t.w,t.h);
  V.style.display="none"; cv.style.display="block"; $("cropLayer").style.display="none";

  setupAudio();
  if(audioCtx && audioCtx.state==="suspended"){ try{ await audioCtx.resume(); }catch(e){} }
  if(monitorGain) monitorGain.gain.value = 0;
  keepAwake(true);

  const total = list.reduce((a,s)=>a+(s.end-s.start),0);
  let doneLen = 0, saved = [], slow = false, cut = false, failed = 0;

  try{
    for(let i=0;i<list.length;i++){
      if(cancelExport) break;
      const s = list[i];
      const len = s.end - s.start;
      const label = multi ? "Clip "+(i+1)+" of "+list.length+" · " : "";

      const onProg = (p, left)=>{
        const overall = (doneLen + p*len)/total;
        $("barI").style.width=(overall*100).toFixed(1)+"%";
        setStatus(label+(isGif?"building GIF ":(isStory||isManual)?"grabbing frames ":"recording ")+Math.round(p*100)+"% · about "+Math.ceil(left)+"s left");
      };
      const r = isGif ? await renderGif(s.start, s.end, t, ctx, cv, onProg)
              : isManual ? await renderManual(s.start, s.end, t, ctx, cv, onProg)
              : isStory ? await renderStory(s.start, s.end, t, ctx, cv, onProg)
                      : await recordRange(s.start, s.end, t, mime, ctx, cv, onProg);
      doneLen += len;
      lastExt = r.ext;
      if(r.stalled) cut = true;
      if(!r.stalled && r.speed < 0.9) slow = true;

      if(r.aborted) break;                 // stopped part-way through this clip — discard it
      if(!r.blob.size){ failed++; continue; }

      const fname = clipFileName(i, s, t, multi);
      if(dirHandle){
        setStatus(label+"saving…");
        try{
          const fh = await dirHandle.getFileHandle(fname, {create:true});
          const ws = await fh.createWritable();
          await ws.write(r.blob); await ws.close();
          saved.push(fname+"  ("+bytes(r.blob.size)+")");
        }catch(e){ failed++; saved.push(fname+" — could not be written: "+e.message); }
      }else if(multi){
        pushDownload(r.blob, fname);
        saved.push(fname+"  ("+bytes(r.blob.size)+")");
        await new Promise(r2=>setTimeout(r2,400));      // let the browser keep up
      }else{
        lastBlob = r.blob;
        lastMeta = {w:t.w, h:t.h, f:t.f, at:s.start, name:s.name};
        const url = URL.createObjectURL(lastBlob);
        if(isGif || isStory || isManual){ $("outImg").src=url; $("outImg").style.display="block"; $("outVid").style.display="none"; }
        else     { $("outVid").src=url; $("outVid").style.display="block"; $("outImg").style.display="none"; }
        $("result").style.display="block";
        const n = download();
        saved.push((n||fname)+"  ("+bytes(r.blob.size)+")");
      }
    }
  }catch(err){
    setStatus(err.message);
  }finally{
    exporting=false;
    if(monitorGain) monitorGain.gain.value=1;
    cv.style.display="none"; V.style.display="block";
    if(crop){ showCrop(true); layoutCrop(); }
    $("exportBtn").disabled=false; $("gifBtn").disabled=false; $("snapBtn").disabled=false;
    $("sbBtn").disabled=false; $("msBtn").disabled=false;
    $("stopBtn").style.display="none";
    $("expNote").style.display="none";
    $("bar").style.display="none";
    keepAwake(false);
    V.currentTime=inT;
    estimate();
  }

  // ---- report ----
  const notes=[];
  if(lastExt==="webm" && !isGif && !isStory && !isManual) notes.push("Saved as .webm — this browser can't record MP4. Plays in Chrome, Edge, Firefox and VLC.");
  if(cut)  notes.push("Playback stalled on at least one clip, so it may be cut short.");
  if(slow && !isGif && !isStory && !isManual) notes.push("Your computer couldn't play the video at full speed, so clips may run slightly slow. Try a smaller output size or lower quality.");
  if(failed) notes.push(failed+" clip(s) could not be saved.");

  if(multi){
    $("saved").style.display = saved.length ? "block" : "none";
    $("savedWhere").textContent = cancelExport
      ? "Stopped — "+saved.length+" of "+list.length+" saved"
      : "Saved "+saved.length+" clip"+(saved.length===1?"":"s")+(dirHandle? " to “"+dirHandle.name+"”" : " to your Downloads folder");
    $("savedList").innerHTML="";
    saved.forEach(n=>{ const li=document.createElement("li"); li.textContent=n; $("savedList").appendChild(li); });
    if(!dirHandle && saved.length>1) notes.push("Chrome asks permission the first time a page saves several files — choose Allow if you see that prompt.");
    $("savedNote").textContent = notes.join(" ");
    setStatus(cancelExport ? "Stopped." : "Done — "+saved.length+" clip"+(saved.length===1?"":"s")+".");
  }else{
    $("outNote").textContent = notes.join(" ");
    setStatus(cancelExport ? "Stopped." : (saved[0] ? "Saved "+saved[0] : "Nothing was saved."));
  }
}

function clipFileName(i, s, t, multi){
  const base = safeName(srcName,60) || "clip";
  if(lastExt==="png"){
    const lblS = safeName(s.name,40);
    const gg = sheetKind==="manual" ? msGrid() : sbGrid();
    return base+"_storyboard_"+(sheetKind==="manual"?"manual_":"")+gg.c+"x"+gg.r+"_"+(multi? String(i+1).padStart(2,"0")+"_" : "")+(lblS || stamp(s.start))+".png";
  }
  if(lastExt==="gif"){
    const lbl0 = safeName(s.name,40);
    return base+"_"+(multi? String(i+1).padStart(2,"0")+"_" : "")+(lbl0 || stamp(s.start))+"_"+t.w+"px.gif";
  }
  if(!multi) return base+"_"+stamp(s.start)+"_"+t.w+"x"+t.h+"_"+t.f+"fps."+lastExt;
  const lbl = safeName(s.name,40);
  return base+"_"+String(i+1).padStart(2,"0")+"_"+(lbl || stamp(s.start))+"."+lastExt;
}
function pushDownload(blob, name){
  try{
    const a=document.createElement("a");
    a.href=URL.createObjectURL(blob); a.download=name; a.style.display="none";
    document.body.appendChild(a); a.click();
    setTimeout(()=>{ URL.revokeObjectURL(a.href); a.remove(); }, 12000);
    return name;
  }catch(e){ return null; }
}
function download(){
  if(!lastBlob || !lastBlob.size) return null;
  const m = lastMeta || Object.assign(targets(), {at:inT, name:""});
  const base = safeName(srcName,60) || "clip";
  const lbl = safeName(m.name,40);
  const name = lastExt==="png"
    ? base+"_storyboard_"+(sheetKind==="manual"?"manual_":"")
        +(sheetKind==="manual"?msGrid().c:sbGrid().c)+"x"+(sheetKind==="manual"?msGrid().r:sbGrid().r)
        +"_"+(lbl || stamp(m.at))+".png"
    : lastExt==="gif"
    ? base+"_"+(lbl || stamp(m.at))+"_"+m.w+"px.gif"
    : base+"_"+(lbl || stamp(m.at))+"_"+m.w+"x"+m.h+"_"+m.f+"fps."+lastExt;
  return pushDownload(lastBlob, name);
}
$("dlBtn").addEventListener("click", ()=>{ download(); });
$("clearRes").addEventListener("click", clearResult);
function clearResult(){
  lastBlob=null; lastMeta=null; $("result").style.display="none";
  const ov=$("outVid"); if(ov.src){ URL.revokeObjectURL(ov.src); ov.removeAttribute("src"); }
  const oi=$("outImg"); if(oi.src){ URL.revokeObjectURL(oi.src); oi.removeAttribute("src"); }
  setStatus("");
}
function clearSaved(){ $("saved").style.display="none"; $("savedList").innerHTML=""; $("savedNote").textContent=""; }
function setStatus(s){ $("status").textContent=s; }

window.__vt = {
  get state(){ return {ready:$("app").style.display==="block",loads:loadSeq,dur,inT,outT,natW,natH,srcFps,
                       exporting,size:lastBlob&&lastBlob.size,ext:lastExt,
                       clips:segments.map(s=>({start:+s.start.toFixed(3),end:+s.end.toFixed(3),name:s.name}))}; },
  load, doExport, addClip,
  gif(){ return doExport("gif"); },
  story(){ return doExport("story"); },
  manual(){ return doExport("manual"); },
  addSnap, snaps(){ return snaps.map(x=>+x.t.toFixed(3)); },
  picMode(v){ picMode=v; syncMode(); },
  set(a,b){ inT=a; outT=b; refresh(); },
  shift(d){ nudge(d); },
  shiftTo(t){ shiftTo(t); },
  activeSeg(){ return activeSeg; },
  pickClip(i){ const sg=segments[i]; if(!sg) return; activeSeg=i; inT=sg.start; outT=sg.end; V.currentTime=sg.start; refresh(); },
  setCrop(x,y,w,h){ setCrop(x,y,w,h); showCrop(true); cropChanged(true); },
  getCrop(){ return crop && {...crop}; },
  setAR(v,l){ applyAR(v, l||String(v)); },
  arLabel(){ return cropARLabel; },
  setName(i,n){ segments[i].name=n; refresh(); },
  clearClips(){ segments=[]; activeSeg=-1; refresh(); }
};
})();
</script>
</body>
</html>