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bytebrains
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<link href="https://fonts.googleapis.com/css2?family=Caveat:wght@400;600;700&family=Indie+Flower&family=Patrick+Hand&display=swap" rel="stylesheet"/>
<style>
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --chalk-white:#f5f0e8;--chalk-yellow:#f7e06a;
  --chalk-pink:#f4a0b0;--chalk-blue:#a0c4f4;--chalk-orange:#f4b87a;
  --frame-wood:#5c3a1e;
}

/* 9:16 vertical ratio container */
html,body{
  width:100%;
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  background:#111;
  font-family:'Caveat',cursive;
  padding:20px 0 40px;
}

.frame{
  position:relative;
  /* 9:16 ratio — width × (16/9) = height */
  width:390px;
  height:693px; /* 390 × 16/9 ≈ 693 */
  background:var(--frame-wood);
  border-radius:6px;
  padding:18px 18px 0;
  box-shadow:inset 0 0 14px rgba(0,0,0,.7),0 10px 50px rgba(0,0,0,.9),0 0 0 3px #3a2010,0 0 0 7px #7a4a20;
  overflow:hidden;
  display:flex;
  flex-direction:column;
}
.frame::before{
  content:'';
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(90deg,transparent 0,transparent 20px,rgba(0,0,0,.07) 20px,rgba(0,0,0,.07) 21px);
  pointer-events:none;
  z-index:1;
}

.chalk-tray{
  position:relative;
  height:24px;
  background:linear-gradient(180deg,#3a2010 0%,#5c3a1e 40%,#7a4a20 100%);
  border-top:2px solid #8b5c2a;
  display:flex;
  align-items:center;
  padding:0 22px;
  gap:12px;
  flex-shrink:0;
  margin-top:auto;
  z-index:2;
}
.chalk-stick{height:11px;border-radius:4px;opacity:.9}

.board{
  position:relative;
  flex:1;
  background:radial-gradient(ellipse at 25% 15%,#3a7030 0%,transparent 55%),
              radial-gradient(ellipse at 80% 85%,rgba(70,110,50,.35) 0%,transparent 50%),
              #2d5a27;
  border-radius:2px;
  overflow:hidden;
  padding:16px 18px 14px;
  display:flex;
  flex-direction:column;
}

/* chalk filter */
.chalk{filter:url(#chalk-filter)}

/* text elements */
.ch-title{font-family:'Caveat',cursive;font-size:26px;font-weight:700;color:var(--chalk-yellow);text-align:center;letter-spacing:1.5px;text-shadow:0 0 16px rgba(247,224,106,.4);opacity:0;animation:fadeChalk .5s ease both .1s}
.ch-sub{font-family:'Patrick Hand',cursive;font-size:12px;color:var(--chalk-orange);text-align:center;letter-spacing:1px;margin-top:2px;opacity:0;animation:fadeChalk .5s ease both .2s}
.ch-divider{height:2px;background:var(--chalk-white);border-radius:2px;margin:10px 4px 12px;opacity:0;transform-origin:left;animation:drawLine .7s ease both .35s}
.ch-label{font-family:'Patrick Hand',cursive;font-size:11.5px;font-weight:600;letter-spacing:2px;text-transform:uppercase;margin-bottom:6px;opacity:0;animation:fadeChalk .5s ease both}
.ch-list{list-style:none;padding:0;margin:0}
.ch-list li{font-family:'Indie Flower',cursive;font-size:15px;line-height:1.4;padding-left:22px;position:relative;margin-bottom:3px;color:var(--chalk-white);opacity:0;animation:fadeChalk .5s ease both}
.ch-list li::before{content:attr(data-b);position:absolute;left:2px;color:var(--chalk-yellow)}
.ch-formula{font-family:'Caveat',cursive;font-size:18px;font-weight:600;color:var(--chalk-yellow);text-align:center;border:2px dashed rgba(245,240,232,.35);border-radius:6px;padding:7px 10px;margin:8px 0 6px;opacity:0;animation:fadeChalk .5s ease both}
.ch-footnote{font-family:'Patrick Hand',cursive;font-size:11.5px;color:rgba(245,240,232,.55);font-style:italic;text-align:center;padding-top:4px;opacity:0;animation:fadeChalk .5s ease both}

.yellow{color:var(--chalk-yellow)}.pink{color:var(--chalk-pink)}.blue{color:var(--chalk-blue)}.orange{color:var(--chalk-orange)}
.ul{border-bottom:2px solid currentColor;padding-bottom:1px}

/* SVG draw animation */
.draw{stroke-dasharray:2000;stroke-dashoffset:2000;animation:drawPath var(--dur,2s) ease forwards var(--delay,0s)}
.draw-fast{stroke-dasharray:600;stroke-dashoffset:600;animation:drawPath var(--dur,.8s) ease forwards var(--delay,0s)}
.pop{opacity:0;animation:popIn .3s ease both var(--delay,0s)}

@keyframes drawPath{to{stroke-dashoffset:0}}
@keyframes fadeChalk{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
@keyframes drawLine{from{transform:scaleX(0);opacity:0}to{transform:scaleX(1);opacity:.5}}
@keyframes popIn{from{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}


.d1{animation-delay:.15s!important}.d2{animation-delay:.3s!important}.d3{animation-delay:.5s!important}
.d4{animation-delay:.65s!important}.d5{animation-delay:.8s!important}.d6{animation-delay:.95s!important}
.d7{animation-delay:1.1s!important}.d8{animation-delay:1.25s!important}.d9{animation-delay:1.4s!important}
.d10{animation-delay:1.55s!important}.d11{animation-delay:1.7s!important}.d12{animation-delay:1.85s!important}
.d13{animation-delay:2.0s!important}.d14{animation-delay:2.2s!important}.d15{animation-delay:2.4s!important}
.d16{animation-delay:2.6s!important}.d17{animation-delay:2.8s!important}.d18{animation-delay:3.0s!important}
.d19{animation-delay:3.2s!important}.d20{animation-delay:3.4s!important}
</style>
</head>
<body>

<svg width="0" height="0" style="position:absolute">
<defs>
  <filter id="chalk-filter" x="-5%" y="-5%" width="110%" height="110%">
    <feTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" result="noise"/>
    <feDisplacementMap in="SourceGraphic" in2="noise" scale="1.5" xChannelSelector="R" yChannelSelector="G"/>
  </filter>
</defs>
</svg>

<div class="frame">
 <div class="board">

  {# ── TITLE BLOCK ── #}
  <div class="ch-title chalk d1">{{ title | default("📉 Gradient Descent") }}</div>
  <div class="ch-sub chalk d2">{{ subtitle | default("Machine Learning · How models learn") }}</div>
  <div class="ch-divider chalk"></div>

  {# ══════════════════════════════════════════════════════
     DIAGRAM SLOT — full board width
     Pass diagram_content (raw SVG/HTML) to fill.
     Dimensions: full width, height: 300px
  ══════════════════════════════════════════════════════ #}
  <div style="width:100%;height:300px;flex-shrink:0;margin-bottom:10px;opacity:0;animation:fadeChalk .4s ease both .4s">

    {%- if diagram_content is defined and diagram_content -%}
      <div style="width:100%;height:100%;display:flex;align-items:center;justify-content:center;">
        {{ diagram_content | safe }}
      </div>
    {%- else -%}
      <div style="width:100%;height:100%;border:2px dashed rgba(245,240,232,.25);border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:rgba(245,240,232,.03);filter:url(#chalk-filter);">
        <svg width="72" height="60" viewBox="0 0 72 60" fill="none" xmlns="http://www.w3.org/2000/svg">
          <line x1="8" y1="6" x2="8" y2="52" stroke="rgba(245,240,232,.3)" stroke-width="1.8" stroke-linecap="round"/>
          <line x1="8" y1="52" x2="66" y2="52" stroke="rgba(245,240,232,.3)" stroke-width="1.8" stroke-linecap="round"/>
          <path d="M10 44 C18 34,24 20,36 16 C46 13,54 15,60 24" stroke="rgba(160,196,244,.4)" stroke-width="2" fill="none" stroke-linecap="round"/>
          <circle cx="36" cy="16" r="3.5" fill="rgba(247,224,106,.4)"/>
        </svg>
        <span style="font-family:'Patrick Hand',cursive;font-size:10px;color:rgba(245,240,232,.3);letter-spacing:2px;text-transform:uppercase;">diagram slot</span>
        <span style="font-family:'Indie Flower',cursive;font-size:11px;color:rgba(245,240,232,.18);text-align:center;padding:0 20px;">pass <span style="color:rgba(160,196,244,.4)">diagram_content</span> to fill this area</span>
      </div>
    {%- endif -%}

  </div>{# end diagram slot #}


 </div>{# end board #}

 {# Chalk tray #}
 <div class="chalk-tray">
  <div class="chalk-stick" style="width:54px;background:#f5f0e8"></div>
  <div class="chalk-stick" style="width:40px;background:#f7e06a"></div>
  <div class="chalk-stick" style="width:28px;background:#f4a0b0"></div>
  <div class="chalk-stick" style="width:20px;background:#a0c4f4"></div>
  <div class="chalk-stick" style="width:14px;background:#f4b87a"></div>
 </div>

</div>{# end frame #}

</body>
</html>