/* ==========================================================
   ML Model Hub — Warm Terminal Light / Aged Paper Theme
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=Lora:ital,wght@0,400;0,600;1,400&display=swap');

:root {
  /* palette — warm paper whites, ink darks, one deep green */
  --bg-primary:    #f5f0e8;       /* aged paper */
  --bg-secondary:  #ede8de;       /* slightly darker parchment */
  --bg-card:       #faf7f2;       /* near white with warmth */
  --bg-input:      #f0ebe0;       /* input field, warm */
  --border:        #d4cab8;       /* warm beige border */
  --border-bright: #b8a e96;      /* slightly darker */

  --text-main:     #3a3228;       /* warm dark brown — not pure black */
  --text-dim:      #8a7d6a;       /* mid warm brown */
  --text-bright:   #1e1812;       /* near-black ink */

  --accent:        #3a7a3a;       /* deep forest phosphor green */
  --accent-dim:    #6aaa6a;       /* lighter green for borders */
  --accent-light:  rgba(58,122,58,.1); /* tint for backgrounds */
  --amber:         #9a6820;       /* warm amber for labels */
  --danger:        #9a3a20;

  /* type */
  --ff-body:   'Lora', Georgia, serif;
  --ff-mono:   'IBM Plex Mono', 'Courier New', monospace;

  /* misc */
  --radius:    6px;
  --radius-lg: 10px;
  --nav-h:     58px;
  --max-w:     1120px;
  --transition: .18s ease;
}

/* ---- reset ---- */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }

/* very faint paper grain — purely decorative */
body::before {
  content:'';
  position:fixed; inset:0; z-index:9999; pointer-events:none;
  opacity:.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

body {
  font-family: var(--ff-body);
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--text-bright); }


/* ============ NAVBAR ============ */
.navbar {
  position: sticky; top:0; z-index:100;
  height: var(--nav-h);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  height: 100%; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--ff-mono);
  font-weight: 600; font-size: 1rem;
  color: var(--text-bright);
  letter-spacing: .02em;
}
.nav-logo:hover { text-decoration: none; color: var(--accent); }

.logo-icon {
  width: 32px; height: 32px; display: grid; place-items: center;
  background: transparent;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  font-family: var(--ff-mono);
  font-size: .85rem; font-weight: 600;
}

.nav-links { list-style: none; display: flex; gap: 2px; }
.nav-links a {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--radius);
  font-family: var(--ff-mono);
  font-size: .8rem; font-weight: 400;
  color: var(--text-dim);
  border: 1px solid transparent;
  transition: var(--transition);
}
.nav-links a:hover {
  color: var(--text-main);
  background: var(--bg-secondary);
  border-color: var(--border);
  text-decoration: none;
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
  border-color: var(--accent-dim);
}

/* hamburger */
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 6px;
}
.hamburger span {
  width: 22px; height: 1px; background: var(--text-main);
  border-radius: 0; transition: var(--transition);
}
@media(max-width:700px){
  .hamburger { display: flex; }
  .nav-links {
    display: none; flex-direction: column; gap: 0;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 24px; border-radius: 0; border-color: transparent; }
}


/* ============ HERO ============ */
.hero {
  text-align: center; padding: 64px 24px 32px;
}
.hero h1 {
  font-family: var(--ff-mono);
  font-size: clamp(1.7rem, 4.5vw, 2.8rem);
  font-weight: 500;
  color: var(--text-bright);
  line-height: 1.2;
  letter-spacing: -.01em;
}
.gradient-text {
  color: var(--accent);
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: var(--accent);
}
.hero-subtitle {
  margin-top: 14px;
  font-family: var(--ff-mono);
  font-size: .88rem; font-weight: 300; font-style: italic;
  color: var(--text-dim);
  max-width: 520px; margin-inline: auto;
}
.hero-subtitle::after {
  content: '█';
  color: var(--accent);
  animation: blink 1.1s step-end infinite;
  margin-left: 4px; font-style: normal;
}
@keyframes blink { 50% { opacity: 0; } }


/* ============ CHAT SECTION ============ */
.chat-section {
  padding: 0 24px 48px;
  display: flex; justify-content: center;
}
.chat-container {
  width: 100%; max-width: 780px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}


/* controls */
.controls-row {
  display: flex; gap: 16px; padding: 18px 20px 10px;
  flex-wrap: wrap;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.control-group { flex: 1; min-width: 180px; }
.control-group label {
  display: block;
  font-family: var(--ff-mono);
  font-size: .72rem; font-weight: 500;
  color: var(--amber);
  margin-bottom: 5px;
  letter-spacing: .06em; text-transform: uppercase;
}
.control-group label i { margin-right: 4px; opacity: .7; }
.control-group select {
  width: 100%; padding: 8px 12px;
  font-size: .85rem; font-family: var(--ff-mono);
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  appearance: auto; cursor: pointer;
  transition: var(--transition);
}
.control-group select:focus {
  outline: none;
  border-color: var(--accent-dim);
}


/* model description */
.model-desc {
  margin: 0 20px 12px; padding: 8px 14px;
  background: var(--accent-light);
  border-left: 2px solid var(--accent-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: .8rem; color: var(--text-dim);
  font-family: var(--ff-mono);
  transition: var(--transition);
}
.model-desc::before { content: '// '; color: var(--accent-dim); }


/* chat log */
.chat-log {
  flex: 1; min-height: 340px; max-height: 480px;
  overflow-y: auto; padding: 20px;
  display: flex; flex-direction: column; gap: 14px;
  background: var(--bg-primary);
}
.chat-log::-webkit-scrollbar { width: 4px; }
.chat-log::-webkit-scrollbar-track { background: transparent; }
.chat-log::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.msg { display: flex; gap: 10px; animation: fadeUp .25s ease; }
.msg.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 32px; height: 32px; border-radius: 3px;
  display: grid; place-items: center; flex-shrink: 0;
  font-size: .75rem; font-family: var(--ff-mono); font-weight: 600;
}
.msg.bot .msg-avatar {
  background: var(--accent-light);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
}
.msg.user .msg-avatar {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.msg-bubble {
  max-width: 75%; padding: 10px 15px;
  border-radius: var(--radius);
  font-size: .88rem; line-height: 1.6;
  white-space: normal; word-break: break-word;
  font-family: var(--ff-mono);
}
.msg.bot .msg-bubble {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-dim);
  color: var(--text-main);
}
.msg.user .msg-bubble {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-bright);
}


/* input bar */
.chat-input-bar {
  display: flex; align-items: flex-end; gap: 10px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-input-bar textarea {
  flex: 1; resize: none; overflow: hidden;
  padding: 9px 13px;
  font-size: .88rem; font-family: var(--ff-mono);
  color: var(--text-bright);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  line-height: 1.5; transition: var(--transition);
}
.chat-input-bar textarea::placeholder { color: var(--text-dim); }
.chat-input-bar textarea:focus {
  outline: none;
  border-color: var(--accent-dim);
  background: var(--bg-card);
}

.chat-input-bar button {
  width: 40px; height: 40px;
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  background: transparent;
  color: var(--accent);
  font-size: .95rem; cursor: pointer;
  display: grid; place-items: center;
  transition: var(--transition);
}
.chat-input-bar button:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.chat-input-bar button:disabled {
  opacity: .3; cursor: not-allowed; background: transparent;
}


/* ============ MODEL CARDS ============ */
.models-overview {
  padding: 24px 24px 64px;
  max-width: var(--max-w); margin: 0 auto;
}
.models-overview h2 {
  font-family: var(--ff-mono);
  font-size: 1.1rem; font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 28px; text-align: center;
  letter-spacing: .04em; text-transform: uppercase;
}
.models-overview h2::before { content: '── '; color: var(--border); }
.models-overview h2::after  { content: ' ──'; color: var(--border); }

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 14px;
}
.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.model-card::before {
  content: '';
  position: absolute; top: -1px; left: -1px;
  width: 16px; height: 16px;
  border-top: 2px solid var(--accent-dim);
  border-left: 2px solid var(--accent-dim);
  border-radius: var(--radius) 0 0 0;
  opacity: 0; transition: var(--transition);
}
.model-card:hover {
  border-color: var(--accent-dim);
  background: var(--bg-card);
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
  transform: translateY(-2px);
}
.model-card:hover::before { opacity: 1; }

.card-icon {
  width: 40px; height: 40px; border-radius: var(--radius);
  display: grid; place-items: center;
  background: var(--accent-light);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  font-size: 1rem; margin-bottom: 14px;
}
.model-card h3 {
  font-family: var(--ff-mono);
  font-size: .9rem; font-weight: 600;
  color: var(--text-bright); margin-bottom: 6px;
}
.model-card p {
  font-size: .84rem; color: var(--text-dim);
  line-height: 1.6; margin-bottom: 14px; font-style: italic;
}
.card-badge {
  display: inline-block; padding: 2px 9px;
  font-size: .7rem; font-family: var(--ff-mono);
  background: var(--accent-light);
  border: 1px solid var(--accent-dim);
  border-radius: 2px; color: var(--accent);
  letter-spacing: .04em;
  white-space: normal;   /* allow wrapping */
  word-break: break-word; /* break long tokens */
}


/* ============ TASK PAGES ============ */
.task-page {
  max-width: 820px; margin: 0 auto; padding: 48px 24px 72px;
}
.task-header {
  text-align: center; margin-bottom: 44px;
  border-bottom: 1px solid var(--border); padding-bottom: 32px;
}
.task-number {
  font-family: var(--ff-mono);
  font-size: 3.5rem; font-weight: 300;
  color: var(--accent); opacity: .25;
  line-height: 1;
}
.task-header h1 {
  font-family: var(--ff-body);
  font-size: 1.9rem; font-weight: 600;
  color: var(--text-bright); margin-top: 4px; font-style: italic;
}
.task-subtitle {
  font-family: var(--ff-mono);
  color: var(--text-dim); font-size: .82rem; margin-top: 10px;
}

.task-body { display: flex; flex-direction: column; gap: 18px; }

.task-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.task-card h2 {
  font-family: var(--ff-mono);
  font-size: .82rem; font-weight: 500;
  color: var(--amber);
  margin-bottom: 12px;
  letter-spacing: .05em; text-transform: uppercase;
}
.task-card h2::before { content: '> '; color: var(--text-dim); }
.task-card h2 i { margin-right: 5px; }
.task-card p, .task-card li {
  font-size: .9rem; color: var(--text-main); line-height: 1.75;
}
.task-card code {
  font-family: var(--ff-mono);
  font-size: .82rem;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent-dim);
  border-radius: 3px;
  padding: 1px 5px;
}
.task-card ol {
  padding-left: 20px; display: flex; flex-direction: column; gap: 8px;
}
.task-list {
  padding-left: 20px;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.task-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 12px;
}
.task-figures figure { margin: 0; }
.task-figures img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: block;
  background: var(--bg-card);
}
.task-figures figcaption {
  font-family: var(--ff-mono);
  font-size: .75rem;
  color: var(--text-dim);
  margin-top: 6px;
}
.figures-subhead {
  font-family: var(--ff-mono);
  font-size: .82rem;
  color: var(--text-bright);
  margin-top: 18px;
  margin-bottom: 4px;
  letter-spacing: .03em;
}
.figures-subhead:first-of-type { margin-top: 4px; }

.models-overview-note {
  font-family: var(--ff-mono);
  font-size: .82rem;
  color: var(--text-dim);
  margin-bottom: 18px;
}

.task1-page {
  max-width: 980px;
}
.task1-chat-section {
  padding: 0;
}
.task1-chat-section .chat-container {
  max-width: 100%;
}
.msg.bot[data-family="classical"] .msg-bubble {
  border-left-color: var(--amber);
}
.msg.bot[data-family="ptlm"] .msg-bubble {
  border-left-color: var(--accent);
}
.msg.bot[data-family="classical"] .msg-avatar {
  color: var(--amber);
  border-color: rgba(154,104,32,.45);
  background: rgba(154,104,32,.08);
}
.msg.bot[data-family="ptlm"] .msg-avatar {
  color: var(--accent);
}
.model-badge {
  margin-bottom: 2px;
  font-family: var(--ff-mono);
  font-size: .6rem;
  color: var(--text-dim);
  letter-spacing: .03em;
  text-transform: uppercase;
}
.model-badge span {
  display: inline-block;
  margin-left: 4px;
  padding: 0 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--amber);
}
.result-block .rs {
  display: inline-block;
  margin-left: 10px;
}
.eval-grid > div {
  grid-column: 1 / -1;
}
.eval-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.eval-grid h3 {
  font-family: var(--ff-mono);
  font-size: .85rem;
  color: var(--text-bright);
  margin-bottom: 10px;
}
.eval-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}
.eval-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-family: var(--ff-mono);
  font-size: .75rem;
}
.eval-table th,
.eval-table td {
  padding: 9px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.eval-table th {
  color: var(--amber);
  background: var(--bg-secondary);
  text-transform: uppercase;
  letter-spacing: .05em;
  font-weight: 500;
}
.eval-table tbody tr:last-child td {
  border-bottom: 0;
}
.eval-table td {
  color: var(--text-main);
}
.cross-variety-table .std {
  color: var(--text-dim);
  font-size: .68rem;
  margin-left: 2px;
}
.cross-variety-table tr.diagonal td {
  background: var(--accent-light);
}
.cross-variety-table tr.mixed td {
  border-top: 1px dashed var(--accent-dim);
  font-style: italic;
}
.eval-table tr.best-row td {
  background: rgba(154, 104, 32, .14);
  color: var(--text-bright);
  font-weight: 600;
}
.eval-table tr.best-row td .fa-trophy {
  color: var(--amber);
  margin-left: 6px;
  font-size: .72rem;
}
.cross-variety-table tr.best-row.diagonal td {
  background: rgba(154, 104, 32, .18);
}

.prompt-examples { display: flex; flex-wrap: wrap; gap: 8px; }
.prompt-chip {
  padding: 6px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: .78rem; color: var(--text-dim);
  font-family: var(--ff-mono);
  transition: var(--transition);
}
.prompt-chip:hover { border-color: var(--accent-dim); color: var(--accent); }


/* ============ FOOTER ============ */
.site-footer {
  margin-top: auto; text-align: center;
  padding: 22px 24px;
  font-family: var(--ff-mono);
  font-size: .73rem; color: var(--text-dim);
  border-top: 1px solid var(--border);
  letter-spacing: .03em;
}
.site-footer::before { content: '// '; }


/* ============ RESULT CHIPS ============ */
.result-block { font-family: var(--ff-mono); font-size: .72rem; }
.result-block .rl { color: var(--accent); }
.result-block .rv { color: var(--text-bright); }
.result-block .rs { color: var(--amber); }


/* ============ LOADING DOTS ============ */
.loading-dots span {
  display: inline-block; width: 6px; height: 6px;
  margin: 0 2px; border-radius: 0;
  background: var(--accent);
  animation: bounce .7s infinite alternate;
}
.loading-dots span:nth-child(2) { animation-delay: .18s; }
.loading-dots span:nth-child(3) { animation-delay: .36s; }
@keyframes bounce { to { opacity: .2; transform: translateY(-5px); } }


/* ============ ANIMATIONS ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}


/* ============ RESPONSIVE ============ */
@media(max-width:700px){
  .hero { padding-top: 40px; }
  .chat-log { min-height: 260px; max-height: 360px; }
  .msg-bubble { max-width: 90%; }
  .eval-grid { grid-template-columns: 1fr; }
}