:root {
    color-scheme: light;
    --navy: #ffffff;
    --navy2: #f7f9fc;
    --navy3: #f1f5fa;
    --navy4: #e9eef5;
    --navy5: #dce5f0;
    --cyan: #1d5bbf;
    --accent-primary: var(--cyan);  /* alias for Rule links (LICENSE / IP clauses) — matches site accent */
    --cyan-dim: #edf3fc;
    --teal: #0f766e;
    --teal-dim: #eef8f5;
    --amber: #8c6516;
    --red: #b93838;
    --text-primary: #172b47;
    --text-secondary: #44536a;
    --text-muted: #5e6b7f;
    --border: #e5eaf1;
    --border2: #d6dfec;
    --section-alt: #ffffff;
    --card-bg: #ffffff;
    --card-border: #e0e6ef;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; font-size: 18px; }
  body {
    background: var(--navy);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 1rem;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  a { color: var(--cyan); text-decoration: none; }
  a:hover { color: #174c9f; }
  [hidden] { display: none !important; }
  main { flex: 1; }
  a:focus-visible, button:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 4px;
  }
  .skip-link {
    position: fixed;
    top: 0.5rem;
    left: 0.5rem;
    z-index: 200;
    padding: 0.5rem 1rem;
    background: var(--navy3);
    transform: translateY(-150%);
  }
  .skip-link:focus { transform: translateY(0); }
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.97);
    border-bottom: 1px solid var(--border2);
    backdrop-filter: blur(12px);
  }
  .site-nav {
    max-width: 1200px;
    min-height: 72px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
  }
  .nav-logo {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
    white-space: nowrap;
  }
  .nav-logo span { color: var(--cyan); }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 1.3rem;
    list-style: none;
  }
  .nav-links a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
  }
  .nav-links a.active {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
  }
  .nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border2);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 0.4rem 0.8rem;
    font: inherit;
    font-size: 0.85rem;
    cursor: pointer;
  }
  .page-nav {
    width: 100%;
    max-width: 1128px;
    margin: 0 auto;
    padding: 1rem 1.5rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.4rem;
  }
  .page-nav a {
    font-size: 0.83rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
    border-bottom: 1px solid transparent;
  }
  .page-nav a[aria-current="page"] {
    color: var(--text-primary);
    border-bottom-color: var(--text-secondary);
  }
  .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1.4rem;
    margin-top: 0.6rem;
  }
  @media (max-width: 1000px) {
    .site-nav { flex-wrap: wrap; gap: 0.5rem; }
    .nav-toggle { display: block; }
    .nav-links {
      width: 100%;
      flex-wrap: wrap;
      gap: 0.25rem 1.5rem;
    }
    .site-nav.menu-ready .nav-links { display: none; }
    .site-nav.menu-open .nav-links { display: flex; }
    .nav-links a { padding: 0.6rem 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition: none !important; }
  }

  section { padding: 3rem 1.5rem; scroll-margin-top: 5rem; }
  .inner { max-width: 1080px; margin: 0 auto; }
  .section-tag { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cyan); margin-bottom: 0.6rem; display: block; }
  .section-title { font-size: 2.1rem; font-weight: 700; line-height: 1.2; margin-bottom: 1rem; }
  .section-desc { color: var(--text-secondary); max-width: 800px; font-size: 1rem; line-height: 1.8; }
  #overview .section-desc, #dataset .section-desc { max-width: none; }

  /* Grand Finals photo gallery */
  #results { background: var(--section-alt); }
  .results-track { margin-top: 2rem; }
  .results-track h2 { margin-bottom: 0.85rem; font-size: 1.25rem; }
  .results-podium { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .results-podium figure { border: 1px solid var(--border2); border-radius: 8px; background: var(--card-bg); }
  .results-podium figure, .track-card, .award-card, .contact-card, .org-card {
    box-shadow: 0 3px 16px rgba(23, 43, 71, 0.04);
  }
  .results-podium a { display: block; }
  .results-podium img { display: block; width: 100%; height: auto; border-radius: 7px 7px 0 0; }
  .results-podium figcaption { padding: 0.8rem 1rem 1rem; line-height: 1.45; }
  .results-podium strong { display: block; font-size: 1.1rem; }
  .winner-members {
    list-style: none;
    margin-top: 0.9rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--border2);
  }
  .winner-members li + li { margin-top: 0.85rem; }
  .member-name, .member-affiliation { display: block; }
  .member-name { font-size: 0.87rem; color: var(--text-primary); }
  .member-affiliation {
    margin-top: 0.2rem;
    font-size: 0.79rem;
    line-height: 1.5;
    color: var(--text-secondary);
  }
  .result-place { font-size: 0.8rem; font-weight: 600; }
  .result-place.gold { color: var(--amber); }
  .result-place.silver { color: #5f6b7d; }
  .result-place.bronze { color: #8c5333; }
  @media (max-width: 650px) {
    .results-podium { grid-template-columns: 1fr; }
  }

  /* HERO */
  #hero { padding-top: 1.5rem; padding-bottom: 2rem; text-align: center; }
  #hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); font-weight: 700; line-height: 1.15; color: var(--text-primary); margin-bottom: 0.6rem; letter-spacing: -0.02em; }
  #hero .lead { font-size: 0.95rem; color: var(--text-secondary); margin: 0 auto; line-height: 1.6; }
  .home-thanks { margin: 1.2rem auto; color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
  .hero-btns { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
  #overview .hero-btns { justify-content: flex-start; margin-top: 1.5rem; }
  .btn-p { background: var(--cyan); color: #ffffff; font-weight: 600; font-size: 0.95rem; padding: 0.75rem 1.8rem; border-radius: 5px; transition: background-color 0.15s; }
  .btn-p:hover { background: #174c9f; color: #ffffff; }
  .btn-o { background: var(--card-bg); border: 1px solid var(--border2); color: var(--text-secondary); font-size: 0.95rem; padding: 0.75rem 1.8rem; border-radius: 5px; transition: all 0.15s; font-weight: 500; }
  .btn-o:hover { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }
  /* Hero dropdowns (Kaggle tracks / dataset mirrors) */
  .hero-dd { position: relative; display: inline-flex; }
  .hero-dd-toggle { cursor: pointer; font-family: inherit; display: inline-flex; align-items: center; gap: 0.45rem; }
  .btn-p.hero-dd-toggle { border: none; }
  .btn-o.hero-dd-toggle { background: transparent; }
  .hero-dd-toggle .caret { font-size: 0.65em; line-height: 1; transition: transform 0.18s; }
  .hero-dd.open .hero-dd-toggle .caret { transform: rotate(180deg); }
  .hero-dd-menu { position: absolute; top: calc(100% + 0.55rem); left: 50%; transform: translateX(-50%) translateY(-6px); min-width: 250px; max-width: calc(100vw - 2rem); background: var(--card-bg); border: 1px solid var(--border2); border-radius: 10px; padding: 0.4rem; box-shadow: 0 16px 40px rgba(23,43,71,0.12); display: flex; flex-direction: column; gap: 0.15rem; z-index: 60; max-height: min(72vh, 440px); overflow-y: auto; opacity: 0; visibility: hidden; pointer-events: none; transition: opacity 0.15s, transform 0.15s; text-align: left; }
  .hero-dd.open .hero-dd-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0); }
  .hero-dd-menu a { display: flex; flex-direction: column; gap: 0.12rem; padding: 0.6rem 0.85rem; border-radius: 6px; color: var(--text-primary); font-weight: 600; font-size: 0.92rem; transition: background 0.12s, color 0.12s; }
  .hero-dd-menu a:hover { background: var(--cyan-dim); color: var(--cyan); }
  .hero-dd-menu .dd-sub { font-size: 0.72rem; font-weight: 500; color: var(--text-muted); letter-spacing: 0.01em; }
  .hero-dd-menu a:hover .dd-sub { color: var(--cyan); }
  .hero-dd-menu .dd-section { font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.09em; color: var(--text-muted); padding: 0.55rem 0.85rem 0.3rem; }
  .hero-dd-menu .dd-section ~ .dd-section { border-top: 1px solid var(--border); margin-top: 0.25rem; }
  .finals-gallery {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
    margin-top: 1.3rem;
    text-align: left;
  }
  .finals-gallery figure {
    overflow: hidden;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
  }
  .finals-gallery a, .finals-gallery img { display: block; }
  .finals-gallery img { width: 100%; height: auto; }
  .finals-gallery figcaption {
    padding: 0.7rem 1rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
  }
  .hero-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 2rem; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
  .hero-stat { background: var(--navy2); padding: 1.4rem 0.5rem; text-align: center; border-right: 1px solid var(--border); }
  .hero-stat:last-child { border-right: none; }
  .hero-stat .val { font-size: 1.75rem; font-weight: 700; color: var(--cyan); line-height: 1; }
  .hero-stat .lbl { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.4rem; line-height: 1.4; }

  /* NEWS */
  #news { background: var(--section-alt); }
  .news-list { margin-top: 2rem; }
  .news-item { display: flex; gap: 2rem; padding: 1rem 0; border-bottom: 1px solid var(--border); align-items: flex-start; }
  .news-item:last-child { border-bottom: none; }
  .news-date { font-size: 0.8rem; color: var(--text-muted); min-width: 85px; padding-top: 0.15rem; font-weight: 500; }
  .news-tag { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; background: var(--cyan-dim); color: var(--cyan); padding: 0.15rem 0.6rem; border-radius: 3px; margin-right: 0.6rem; }
  .news-tag.green { background: var(--teal-dim); color: var(--teal); }
  .news-text { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.65; }

  /* OVERVIEW & DATASET */
  #overview { background: var(--navy); }
  #dataset { background: var(--navy); }
  .ov-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-top: 2rem; }
  .no-rgb-callout { background: linear-gradient(135deg, rgba(185,56,56,0.09), rgba(29,91,191,0.05)); border: 1px solid rgba(185,56,56,0.28); border-radius: 8px; padding: 1.3rem 1.6rem; margin-top: 1.8rem; margin-bottom: 0.5rem; }
  .callout-head { display: flex; align-items: center; gap: 0.65rem; margin-bottom: 0.6rem; }
  .callout-icon { font-size: 1.4rem; color: var(--red); font-weight: 700; line-height: 1; }
  .callout-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); letter-spacing: 0.01em; }
  .no-rgb-callout p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.75; }
  .tag-excluded { background: rgba(185,56,56,0.08); border: 1px solid rgba(185,56,56,0.25); color: var(--red); text-decoration: line-through; }
  .info-block { border-left: 2px solid var(--border2); padding-left: 1rem; margin-bottom: 1.2rem; }
  .info-block dt { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.25rem; }
  .info-block dd { font-size: 0.98rem; color: var(--text-primary); line-height: 1.6; }
  .split-card { margin-top: 1.5rem; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 1.2rem 1.5rem; }
  .split-card h4 { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 1rem; }
  .split-row { display: flex; gap: 1rem; }
  .split-item { flex: 1; text-align: center; padding: 1rem 0.5rem; background: var(--navy3); border-radius: 6px; }
  .split-item .sv { font-size: 1.7rem; font-weight: 700; color: var(--cyan); }
  .split-item .sl { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }
  .split-item .su { font-size: 0.75rem; color: var(--text-secondary); margin-top: 0.4rem; font-family: 'SF Mono', Menlo, monospace; }
  .dataset-actions { display: flex; gap: 1rem; margin-top: 1.5rem; }
  .dl-btn { background: var(--card-bg); border: 1px solid var(--border2); border-radius: 8px; padding: 1.1rem 1.4rem; display: flex; align-items: center; gap: 1rem; color: var(--text-primary); transition: all 0.15s; }
  .dl-btn:hover { border-color: var(--cyan); background: var(--navy3); opacity: 1; }
  .dl-icon { font-size: 1.6rem; flex-shrink: 0; line-height: 1; }
  .dl-text { display: flex; flex-direction: column; gap: 0.2rem; }
  .dl-text strong { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
  .dl-text span { font-size: 0.8rem; color: var(--text-muted); font-family: 'SF Mono', Menlo, monospace; }
  .tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
  .tag { background: var(--navy3); border: 1px solid var(--border); padding: 0.32rem 0.8rem; border-radius: 4px; font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; }
  .tag.b { background: var(--cyan-dim); border-color: var(--border2); color: var(--cyan); }
  .tag.t { background: var(--teal-dim); border-color: rgba(15,118,110,0.25); color: var(--teal); }
  .tag-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.09em; color: var(--text-muted); margin-top: 1.3rem; margin-bottom: 0.5rem; }

  /* TRACKS */
  #format { background: var(--section-alt); }
  .tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2.5rem; }
  .track-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; overflow: hidden; }
  .track-head { padding: 1.1rem 1.4rem; border-bottom: 1px solid var(--border); }
  .track-head-top { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.2rem; }
  .track-head h3 { font-size: 1.1rem; font-weight: 600; color: var(--text-primary); }
  .track-badge { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; padding: 0.22rem 0.65rem; border-radius: 3px; }
  .track-badge.sm { background: var(--teal-dim); color: var(--teal); border: 1px solid rgba(15,118,110,0.25); }
  .track-badge.lm { background: var(--cyan-dim); color: var(--cyan); border: 1px solid var(--border2); }
  .track-head p { font-size: 0.82rem; color: var(--text-muted); }
  .track-body { padding: 1.4rem; }
  .tdesc { font-size: 0.93rem; color: var(--text-secondary); margin-bottom: 1.2rem; line-height: 1.75; }
  .track-motiv { background: var(--navy3); border-left: 2px solid var(--cyan); padding: 0.8rem 1rem; margin-bottom: 1.2rem; border-radius: 0 5px 5px 0; }
  .track-motiv .lbl { font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.09em; color: var(--cyan); margin-bottom: 0.3rem; }
  .track-motiv p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; }
  .spec-list { margin-bottom: 1.2rem; }
  .spec-item { display: flex; gap: 0.75rem; padding: 0.5rem 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
  .spec-item:last-child { border-bottom: none; }
  .spec-k { color: var(--text-muted); font-weight: 500; min-width: 130px; font-size: 0.83rem; }
  .spec-v { color: var(--text-primary); }
  .score-h { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.7rem; }
  .sc-row { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.5rem; }
  .sc-label { font-size: 0.86rem; color: var(--text-secondary); flex: 1; }
  .sc-bg { flex: 1.2; height: 4px; background: var(--navy5); border-radius: 2px; }
  .sc-bar { height: 100%; border-radius: 2px; }
  .sc-bar.c { background: var(--cyan); }
  .sc-bar.t { background: var(--teal); }
  .sc-pct { font-size: 0.8rem; color: var(--text-muted); min-width: 32px; text-align: right; }
  .vqa-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin-top: 0.9rem; }
  .vqa-table th { padding: 0.45rem 0.7rem; background: var(--navy3); color: var(--text-muted); font-weight: 600; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em; text-align: left; }
  .vqa-table td { padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
  .vqa-table td:first-child { color: var(--cyan); font-weight: 600; font-size: 0.85rem; }

  /* STAGES */
  .stages-intro { margin-top: 1.5rem; padding: 1rem 1.3rem; background: linear-gradient(135deg, rgba(29,91,191,0.10), rgba(15,118,110,0.04)); border-left: 3px solid var(--cyan); border-radius: 0 6px 6px 0; font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
  .stages-intro strong { color: var(--text-primary); }
  .report-award-note { text-align: justify; text-justify: inter-word; }
  .stages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin-top: 1.2rem; }
  .stage.stage-selection { border-color: rgba(170,122,36,0.25); background: linear-gradient(135deg, var(--card-bg), rgba(170,122,36,0.04)); }
  .stage { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1.4rem 1.5rem; position: relative; }
  .stage.stage-finals { border-color: var(--border2); background: linear-gradient(135deg, var(--card-bg), rgba(29,91,191,0.04)); }
  .stage-n { font-size: 1.9rem; font-weight: 700; color: #71839c; line-height: 1; margin-bottom: 0.5rem; }
  .stage h4 { font-size: 1.02rem; font-weight: 600; color: var(--cyan); margin-bottom: 0.35rem; }
  .stage-period { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.7rem; font-family: 'SF Mono', Menlo, monospace; }
  .stage p { font-size: 0.87rem; color: var(--text-secondary); line-height: 1.7; }
  .stage ul { list-style: none; margin-top: 0.4rem; }
  .stage ul li { font-size: 0.88rem; color: var(--text-secondary); padding: 0.32rem 0 0.32rem 1.1rem; position: relative; line-height: 1.55; }
  .stage ul li::before { content: '›'; position: absolute; left: 0.2rem; top: 0.32rem; color: var(--cyan); font-weight: 700; }
  .stage ul li strong { color: var(--text-primary); }
  .ubicomp-badge { display: inline-block; background: var(--cyan-dim); color: var(--cyan); border: 1px solid var(--border2); padding: 0.15rem 0.55rem; border-radius: 3px; font-size: 0.65rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-left: 0.45rem; vertical-align: middle; }
  .agree-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.agree-label input[type="checkbox"] {
  margin-top: 6px;
  flex-shrink: 0;
}

.agree-text {
  display: inline-block;
  max-width: 100%;
}

.rules-link {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.rules-link:hover {
  color: var(--text-primary);
}
  /* TRAVEL GRANTS */
  /* VERIFICATION */
  #verification { background: var(--section-alt); }
  .verif-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
  .verif-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 1.5rem; }
  .verif-badge { display: inline-block; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; padding: 0.25rem 0.7rem; border-radius: 3px; margin-bottom: 0.8rem; }
  .verif-badge.a { background: var(--teal-dim); color: var(--teal); border: 1px solid rgba(15,118,110,0.25); }
  .verif-badge.b { background: var(--cyan-dim); color: var(--cyan); border: 1px solid var(--border2); }
  .verif-card h3 { font-size: 1.05rem; color: var(--text-primary); margin-bottom: 0.5rem; }
  .verif-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 0.8rem; }
  .verif-card ul { list-style: none; }
  .verif-card li { font-size: 0.85rem; color: var(--text-secondary); padding: 0.32rem 0 0.32rem 1rem; position: relative; line-height: 1.55; }
  .verif-card li::before { content: '›'; position: absolute; left: 0.2rem; color: var(--cyan); font-weight: 700; }
  .verif-card code { background: var(--navy3); padding: 0.1rem 0.4rem; border-radius: 3px; font-size: 0.78rem; color: var(--cyan); font-family: 'SF Mono', Menlo, monospace; }
  .verif-section-h3 { font-size: 1.05rem; color: var(--text-primary); margin-top: 2.5rem; margin-bottom: 1rem; font-weight: 700; }
  .rules-block { margin-top: 1.1rem; padding: 1rem 1.3rem; background: var(--card-bg); border: 1px solid var(--border); border-radius: 7px; border-left: 3px solid var(--red); }
  .rules-block:has(.rules-h4.ok) { border-left-color: var(--teal); }
  .rules-h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; letter-spacing: 0.01em; }
  .rules-list { list-style: none; }
  .rules-list li { font-size: 0.88rem; color: var(--text-secondary); padding: 0.25rem 0 0.25rem 1.2rem; position: relative; line-height: 1.55; }
  .rules-list li::before { content: '✗'; position: absolute; left: 0.2rem; color: var(--red); font-weight: 700; }
  .rules-list.ok li::before { content: '✓'; color: var(--teal); }

  .tier-table { width: 100%; border-collapse: collapse; margin-top: 1rem; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; overflow: hidden; }
  .tier-table th { padding: 0.7rem 1rem; background: var(--navy3); font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); text-align: left; border-bottom: 1px solid var(--border2); }
  .tier-table td { padding: 0.8rem 1rem; font-size: 0.9rem; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
  .tier-table tr:last-child td { border-bottom: none; }
  .tier-table td:first-child { font-size: 1.2rem; width: 50px; text-align: center; }
  .tier-table tr.tier-1 td { color: var(--amber); }
  .tier-table tr.tier-1 td strong { color: var(--amber); }

  .travel-grants { margin-top: 2rem; background: linear-gradient(135deg, rgba(170,122,36,0.08), rgba(29,91,191,0.04)); border: 1px solid rgba(170,122,36,0.22); border-radius: 10px; padding: 1.5rem 1.7rem; }
  .travel-grants h3 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.3rem; }
  .travel-sub { font-size: 0.83rem; color: var(--text-muted); margin-bottom: 1rem; }
  .travel-list { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin-bottom: 1rem; }
  .travel-item { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.9rem; text-align: center; }
  .travel-medal { font-size: 1.4rem; display: block; margin-bottom: 0.3rem; }
  .travel-place { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 0.3rem; font-weight: 600; }
  .travel-amount { font-size: 1.2rem; font-weight: 700; color: var(--amber); }
  .travel-note { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; margin-top: 0.3rem; }

  /* LEADERBOARD */
  #leaderboard { background: var(--section-alt); }
  .lb-tabs { display: flex; gap: 0.6rem; margin-top: 2rem; margin-bottom: 1.2rem; flex-wrap: wrap; }
  .lb-tab { padding: 0.5rem 1.2rem; border-radius: 5px; font-size: 0.88rem; font-weight: 600; border: 1px solid var(--border); color: var(--text-muted); cursor: pointer; transition: all 0.15s; background: transparent; }
  .lb-tab:hover { color: var(--text-secondary); }
  .lb-tab.active { background: var(--cyan-dim); border-color: var(--border2); color: var(--cyan); }
  .lb-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.7rem; flex-wrap: wrap; gap: 0.5rem; }
  .lb-updated { font-size: 0.78rem; color: var(--text-muted); font-family: 'SF Mono', Menlo, monospace; }
  .lb-source-link { font-size: 0.82rem; color: var(--cyan); }
  .lb-table-wrap { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; overflow: hidden; }
  .lb-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
  .lb-table th { padding: 0.7rem 1rem; background: var(--navy3); border-bottom: 1px solid var(--border2); font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); text-align: left; }
  .lb-table td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); }
  .lb-table tr:last-child td { border-bottom: none; }
  .lb-table tr.r1 td { color: var(--amber); }
  .lb-table tr.r2 td, .lb-table tr.r3 td { color: var(--text-primary); }
  .lb-table .lb-team { font-weight: 600; }
  .lb-table .lb-score { font-family: 'SF Mono', Menlo, monospace; font-weight: 600; color: var(--cyan); }
  .lb-table .lb-date { color: var(--text-muted); font-size: 0.83rem; }
  .lb-teamcount { margin-top: 0.85rem; font-size: 0.85rem; color: var(--text-secondary); }
  .lb-teamcount strong { color: var(--cyan); font-weight: 700; }
  .lb-empty { padding: 2.5rem 1rem; text-align: center; color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
  .lb-empty strong { display: block; color: var(--text-secondary); font-size: 1rem; margin-bottom: 0.4rem; }
  .rc { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; border-radius: 50%; font-size: 0.78rem; font-weight: 700; }
  .rc.g { background: rgba(170,122,36,0.1); color: var(--amber); }
  .rc.s { background: #edf1f6; color: var(--text-primary); }
  .rc.b { background: rgba(180,120,80,0.18); color: #8c5333; }
  .rc.n { background: var(--navy4); color: var(--text-muted); }

  /* AWARDS */
  #awards { background: var(--section-alt); }
  .awards-top { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin-top: 2rem; }
  .awards-bottom { display: flex; gap: 1rem; justify-content: center; margin-top: 1rem; }
  .awards-bottom .award-card { max-width: 250px; flex: 1; }
  .award-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 1.4rem 1rem; text-align: center; }
  .award-medal { font-size: 1.75rem; display: block; margin-bottom: 0.55rem; }
  .award-place { font-size: 0.92rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.5rem; }
  .award-amount { font-size: 1.6rem; font-weight: 700; color: var(--amber); }
  .award-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.35rem; }
  .per-track { text-align: center; margin-top: 1.3rem; font-size: 0.88rem; color: var(--text-muted); }

  /* TIMELINE */
  #timeline { background: var(--navy); }
  .tl { margin-top: 2.5rem; position: relative; padding-left: 150px; }
  .tl::before { content: ''; position: absolute; left: 122px; top: 8px; bottom: 0; width: 1px; background: var(--border); }
  .tl-item { margin-bottom: 2.2rem; position: relative; }
  .tl-date { position: absolute; left: -150px; width: 105px; font-size: 0.78rem; color: var(--text-muted); font-weight: 500; text-align: right; padding-top: 0.2rem; line-height: 1.5; }
  .tl-dot { position: absolute; left: -28px; width: 9px; height: 9px; border-radius: 50%; background: var(--navy); border: 2px solid var(--border2); margin-top: 0.38rem; }
  .tl-dot.done { background: var(--cyan); border-color: var(--cyan); }
  .tl-content h4 { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.25rem; }
  .tl-content p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; max-width: 560px; }

  /* REGISTRATION */
  #registration { background: var(--section-alt); }
  .prereg-card { background: linear-gradient(135deg, rgba(29,91,191,0.10), rgba(15,118,110,0.05)); border: 1px solid var(--border2); border-radius: 10px; padding: 1.8rem 2rem; margin-top: 2rem; display: grid; grid-template-columns: 1.5fr 1fr; gap: 2rem; align-items: center; }
  .prereg-left h3 { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.55rem; }
  .prereg-left h3 .badge-soon { display: inline-block; font-size: 0.62rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; background: var(--amber); color: var(--navy); padding: 0.18rem 0.5rem; border-radius: 3px; vertical-align: middle; margin-left: 0.5rem; }
  .prereg-left p { font-size: 0.93rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.2rem; }
  .prereg-cta { display: inline-flex; align-items: center; gap: 0.5rem; }
  .prereg-fields-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); font-weight: 600; margin-bottom: 0.7rem; }
  .prereg-fields-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1rem; }
  .prereg-fields-list li { font-size: 0.83rem; color: var(--text-secondary); padding-left: 1.1rem; position: relative; line-height: 1.5; }
  .prereg-fields-list li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--cyan); font-weight: 700; font-size: 0.85rem; }
  .reg-tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
  .reg-track-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 1.5rem; display: flex; flex-direction: column; align-items: flex-start; transition: border-color 0.15s; }
  .reg-track-card:hover { border-color: var(--border2); }
  .reg-tag { font-size: 0.63rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; padding: 0.2rem 0.6rem; border-radius: 3px; margin-bottom: 0.9rem; }
  .reg-tag.sm { background: var(--teal-dim); color: var(--teal); border: 1px solid rgba(15,118,110,0.25); }
  .reg-tag.lm { background: var(--cyan-dim); color: var(--cyan); border: 1px solid var(--border2); }
  .reg-track-card h3 { font-size: 1.15rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.45rem; }
  .reg-track-card p { font-size: 0.93rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 1.3rem; flex-grow: 1; }
  .reg-btn { align-self: stretch; text-align: center; }
  .reg-steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 0.9rem; margin-top: 1rem; }
  .reg-step { background: var(--card-bg); border: 1px solid var(--border); border-radius: 7px; padding: 1.1rem; }
  .reg-step-n { font-size: 1.6rem; font-weight: 700; color: #71839c; line-height: 1; margin-bottom: 0.45rem; }
  .reg-step h4 { font-size: 0.95rem; font-weight: 600; color: var(--cyan); margin-bottom: 0.4rem; }
  .reg-step p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; }
  .reg-info { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-top: 2rem; }
  .reg-info-block { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 7px; padding: 1.3rem 1.5rem; }
  .reg-info-block h4 { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--cyan); margin-bottom: 0.8rem; }
  .reg-info-block ul { list-style: none; }
  .reg-info-block li { font-size: 0.93rem; color: var(--text-secondary); padding: 0.38rem 0 0.38rem 1rem; position: relative; line-height: 1.65; }
  .reg-info-block li::before { content: '›'; position: absolute; left: 0; top: 0.32rem; color: var(--cyan); font-weight: 700; }

  /* SPONSORS */
  #sponsors { background: var(--section-alt); }
  .sponsor-row { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-top: 2rem; align-items: center; }
  .sponsor-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 1.2rem 2rem; display: flex; align-items: center; gap: 0.9rem; }
  .sponsor-name { font-size: 1.45rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.01em; }
  .sponsor-tier { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--amber); border: 1px solid rgba(170,122,36,0.25); background: rgba(170,122,36,0.08); padding: 0.25rem 0.65rem; border-radius: 3px; }

  /* ORGANIZERS */
  #organizers { background: var(--navy); }
  .org-group { margin-top: 2rem; }
  .org-group-title { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
  .org-grid { display: flex; flex-wrap: wrap; gap: 1.2rem; justify-content: center; }
  .org-card { flex: 0 1 220px; min-width: 200px; max-width: 240px; }
  .org-grid--3 { max-width: 760px; margin-left: auto; margin-right: auto; }
  .org-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 7px; padding: 1.1rem; text-align: center; }
  .org-av { width: 112px; height: 112px; border-radius: 50%; background: var(--navy4); border: 1px solid var(--border2); display: flex; align-items: center; justify-content: center; font-size: 1.25rem; font-weight: 600; color: var(--cyan); margin: 0 auto 1rem; overflow: hidden; }
  .org-av img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 15%; display: block; }
  .org-name { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
  .org-role { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.2rem; }
  .org-affil { font-size: 0.78rem; color: var(--cyan); margin-top: 0.3rem; }
  .org-email { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; word-break: break-all; }

  /* CONTACT */
  #contact { background: var(--section-alt); }
  .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-top: 2rem; }
  .contact-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 7px; padding: 1.3rem 1.4rem; }
  .contact-card h4 { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.09em; color: var(--text-muted); margin-bottom: 0.9rem; }
  .contact-row { display: flex; align-items: flex-start; gap: 0.6rem; margin-bottom: 0.55rem; font-size: 0.93rem; }
  .contact-row a { min-width: 0; overflow-wrap: anywhere; }
  .cdot { width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); flex-shrink: 0; margin-top: 0.5rem; }

  /* PAST */
  #past { background: var(--navy); }
  .past-links { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.5rem; }
  .past-link { background: var(--navy3); border: 1px solid var(--border); padding: 0.6rem 1.2rem; border-radius: 5px; font-size: 0.83rem; color: var(--text-secondary); transition: all 0.15s; font-weight: 500; }
  .past-link:hover { border-color: var(--cyan); color: var(--cyan); }

  /* REGISTRATION MODAL */
  .modal-backdrop { position: fixed; inset: 0; background: rgba(23,43,71,0.32); backdrop-filter: blur(6px); z-index: 1000; display: none; align-items: flex-start; justify-content: center; padding: 4rem 1rem 2rem; overflow-y: auto; }
  .modal-backdrop.open { display: flex; }
  .modal { background: var(--card-bg); border: 1px solid var(--border2); border-radius: 12px; max-width: 640px; width: 100%; padding: 2rem 2.2rem; box-shadow: 0 20px 60px rgba(23,43,71,0.16); position: relative; }
  .modal-close { position: absolute; top: 1rem; right: 1.2rem; background: transparent; border: none; color: var(--text-muted); font-size: 1.5rem; cursor: pointer; line-height: 1; padding: 0.3rem; }
  .modal-close:hover { color: var(--cyan); }
  .modal h3 { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.3rem; }
  .modal-sub { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 1.5rem; }
  .form-row { margin-bottom: 1.1rem; }
  .form-row.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .form-row label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.4rem; letter-spacing: 0.02em; }
  .form-row label .req { color: var(--red); margin-left: 0.2rem; }
  .form-row input, .form-row select, .form-row textarea { width: 100%; background: var(--card-bg); border: 1px solid #8393a8; border-radius: 5px; padding: 0.6rem 0.8rem; color: var(--text-primary); font-family: inherit; font-size: 0.92rem; transition: border-color 0.15s; }
  .form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: none; border-color: var(--cyan); }
  .form-row textarea { resize: vertical; min-height: 70px; }
  .form-row .helper { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; }
  .member-input { display: flex; gap: 0.5rem; margin-bottom: 0.45rem; align-items: center; }
  .member-input input { flex: 1; }
  .remove-member-btn { background: transparent; border: 1px solid var(--border); color: var(--text-muted); width: 34px; height: 34px; min-width: 34px; border-radius: 4px; cursor: pointer; font-size: 1.1rem; line-height: 1; padding: 0; transition: all 0.15s; font-family: inherit; }
  .remove-member-btn:hover { color: var(--red); border-color: var(--red); }
  .add-member-btn { background: transparent; border: 1px dashed var(--border2); color: var(--cyan); padding: 0.5rem 1rem; border-radius: 5px; cursor: pointer; font-size: 0.85rem; font-weight: 600; margin-top: 0.4rem; transition: all 0.15s; font-family: inherit; }
  .add-member-btn:hover { background: var(--cyan-dim); }
  .add-member-btn:disabled { opacity: 0.4; cursor: not-allowed; color: var(--text-muted); border-style: solid; }
  .checkbox-group { display: flex; gap: 1rem; flex-wrap: wrap; }
  .checkbox-group label { display: inline-flex; align-items: center; gap: 0.45rem; font-weight: 500; font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 0; cursor: pointer; text-transform: none; letter-spacing: 0; }
  .checkbox-group input[type="checkbox"], .checkbox-group input[type="radio"] { width: 16px; height: 16px; accent-color: var(--cyan); cursor: pointer; }
  .form-actions { display: flex; gap: 0.7rem; margin-top: 1.5rem; align-items: center; }
  .form-actions .btn-p { padding: 0.7rem 1.6rem; cursor: pointer; border: none; font-family: inherit; }
  .form-actions .btn-p:disabled { opacity: 0.5; cursor: not-allowed; }
  .form-status { font-size: 0.85rem; }
  .form-status.success { color: var(--teal); }
  .form-status.error { color: var(--red); }
  .form-status.loading { color: var(--text-muted); }
  body.modal-open { overflow: hidden; }

  footer { background: var(--navy2); border-top: 1px solid var(--border); padding: 2rem 3rem; text-align: center; font-size: 0.88rem; color: var(--text-muted); }
  footer a { color: var(--text-muted); }
  footer a:hover { color: var(--cyan); }

  @media(max-width:720px){
    section { padding: 2rem 1.2rem; }
    .tracks { grid-template-columns: 1fr; }
    .stages { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: repeat(2,1fr); }
    .finals-gallery { grid-template-columns: 1fr; }
    .ov-cols { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .awards-top { grid-template-columns: 1fr; }
    .awards-bottom { flex-direction: column; align-items: center; }
    .reg-tracks { grid-template-columns: 1fr; }
    .reg-steps { grid-template-columns: repeat(2,1fr); }
    .reg-info { grid-template-columns: 1fr; }
    .dataset-actions { grid-template-columns: 1fr; }
    .prereg-card { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.5rem; }
    .travel-list { grid-template-columns: 1fr; }
    .stages { grid-template-columns: 1fr; }
    .verif-cards { grid-template-columns: 1fr; }
    .tier-table { font-size: 0.82rem; }
    .tier-table td, .tier-table th { padding: 0.6rem 0.5rem; }
  }