/* NVVSpeech Challenge — Leaderboard
   Design tokens & core rules replicated from the official site
   (https://nvvspeech-challenge.github.io/) so this standalone page matches it. */

:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --accent-pink: #db2777;
  --bg-alt: #f6f7fb;
  --text: #1f2330;
  --muted: #5b6172;
  --border: #e3e5ec;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; font-size: 18px; }

body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  font-size: 19px;
  line-height: 1.65;
  background: #fff;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

main { max-width: 1600px; margin: 0 auto; padding: 0 32px; }

/* ---------- Navbar ---------- */
.navbar {
  padding: 24px 48px;
  color: #fff;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background: rgba(30, 27, 75, 0.55);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  transition: background 0.25s ease, padding 0.25s ease, box-shadow 0.25s ease;
}
.navbar.is-scrolled {
  background: rgba(30, 27, 75, 0.92);
  padding: 16px 48px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
}
.nav-brand:hover { text-decoration: none; }
.logo-mark { width: 34px; height: 34px; display: block; }
.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 28px;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover,
.nav-links a.is-active { color: #fff; text-decoration: none; }
.nav-links a.nav-ext { color: rgba(255, 255, 255, 0.66); }
.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}

/* ---------- Hero (lite) ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #312e81 0%, #4f46e5 55%, #db2777 130%);
  color: #fff;
  padding: 72px 32px 84px;
  text-align: center;
}
.hero-decor { position: absolute; inset: 0; pointer-events: none; }
.hero-decor .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(48px);
  opacity: 0.45;
}
.hero-decor .blob.b1 { width: 320px; height: 320px; background: #a855f7; top: -80px; left: -60px; }
.hero-decor .blob.b2 { width: 280px; height: 280px; background: #f472b6; bottom: -90px; right: -40px; }
.hero-content { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; }
.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
  opacity: 0.85;
  margin: 0 0 12px;
}
.hero h1 { font-size: 2.6rem; margin: 0 0 12px; line-height: 1.15; }
.hero .subtitle { font-size: 1.05rem; opacity: 0.9; margin: 0 auto 22px; max-width: 620px; }
.hero .updated { font-size: 0.85rem; opacity: 0.75; margin: 0; }

/* ---------- Sections ---------- */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.section.is-visible { opacity: 1; transform: none; }
.section:last-of-type { border-bottom: none; }
.section h2 {
  position: relative;
  font-size: 1.75rem;
  margin: 0 0 18px;
  color: var(--primary-dark);
  padding-left: 18px;
}
.section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--primary), var(--accent-pink));
}
.section .lead { color: var(--muted); margin: 0 0 4px; }

/* ---------- Track cards ---------- */
.track-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 28px 24px;
  margin-top: 22px;
  box-shadow: 0 4px 18px rgba(31, 35, 48, 0.05);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.track-card:hover {
  box-shadow: 0 10px 28px rgba(31, 35, 48, 0.09);
  transform: translateY(-2px);
}
.track-card.track-1 { border-top: 4px solid var(--primary); }
.track-card.track-2 { border-top: 4px solid var(--accent-pink); }
.track-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.track-head h3 { margin: 0; font-size: 1.3rem; color: var(--text); }
.track-head .track-tag {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.track-desc { color: var(--muted); font-size: 0.92rem; margin: 4px 0 4px; }

/* ---------- Podium (Top 3) ---------- */
.podium {
  list-style: none;
  margin: 22px 0 6px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-items: stretch;
}
.podium-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 20px 16px 18px;
  border: 1px solid var(--border);
  border-top: 4px solid var(--muted);
  border-radius: 14px;
  background: linear-gradient(180deg, #ffffff, #fbfbfe);
  box-shadow: 0 4px 16px rgba(31, 35, 48, 0.06);
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.podium-card:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(31, 35, 48, 0.12); }
.podium-card.p1 { border-top-color: #eab308; background: linear-gradient(180deg, #fffdf3, #fff8dd); transform: translateY(-8px); box-shadow: 0 12px 30px rgba(234, 179, 8, 0.22); }
.podium-card.p1:hover { transform: translateY(-12px); }
.podium-card.p2 { border-top-color: #94a3b8; background: linear-gradient(180deg, #ffffff, #f4f6f9); }
.podium-card.p3 { border-top-color: #c2803f; background: linear-gradient(180deg, #fffaf5, #fdf1e6); }
.podium-card.p3.is-baseline { border-top-color: var(--accent-pink); background: linear-gradient(180deg, #fff7fb, #fdf2f8); }
.podium-rank {
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.podium-rank .medal { font-size: 1.15rem; }
.podium-team { font-size: 1.12rem; font-weight: 800; color: var(--primary-dark); line-height: 1.2; margin-top: 2px; }
.podium-card.p3.is-baseline .podium-team { color: var(--accent-pink); }
.podium-handle { font-size: 0.8rem; color: var(--muted); font-weight: 500; }
.podium-handle::before { content: "@"; opacity: 0.6; }
.podium-score { font-size: 1.85rem; font-weight: 800; color: var(--text); letter-spacing: -0.01em; margin-top: 6px; font-variant-numeric: tabular-nums; }
.podium-card.p1 .podium-score { font-size: 2.1rem; }
.podium-card .status-badge { margin-top: 6px; }
/* A non-competing system can take the top slot in the all-systems view. */
.podium-card.p1.is-noncompeting {
  border-top-color: #7c3aed;
  background: linear-gradient(180deg, #faf8ff, #f3f0ff);
  box-shadow: 0 12px 30px rgba(124, 58, 237, 0.18);
}
.podium-card.p1.is-noncompeting .podium-team { color: #5b21b6; }

/* ---------- Podium variants (one per ranking mode) ---------- */
.podium.mode-all { display: none; }
.track-card[data-rank-mode="all"] .podium.mode-competition { display: none; }
.track-card[data-rank-mode="all"] .podium.mode-all { display: grid; }

/* ---------- Tabs ---------- */
.lb-tabs {
  display: flex;
  gap: 6px;
  margin: 18px 0 4px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.lb-tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.lb-tab:hover { color: var(--primary-dark); }
.lb-tab.is-active { color: var(--primary-dark); border-bottom-color: var(--primary); }
.lb-panel { display: none; }
.lb-panel.is-active { display: block; animation: lb-fade 0.25s ease; }
@keyframes lb-fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.panel-note { color: var(--muted); font-size: 0.92rem; margin: 12px 0 0; }
.panel-note code { font-size: 0.85em; }

/* ---------- Ranking-mode segmented toggle ---------- */
.rank-toggle {
  margin-left: auto;
  align-self: center;
  display: inline-flex;
  gap: 3px;
  padding: 3px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.rank-toggle-btn {
  appearance: none;
  border: 0;
  background: none;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  padding: 5px 14px;
  border-radius: 999px;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.rank-toggle-btn:hover { color: var(--primary-dark); }
.rank-toggle-btn.is-active { background: var(--primary); color: #fff; }
.rank-toggle-btn:focus-visible { outline: 2px solid var(--primary-dark); outline-offset: 2px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin-top: 18px; }
.ds-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(31, 35, 48, 0.06);
}
.ds-table thead { background: var(--primary); color: #fff; }
.ds-table th {
  padding: 12px 16px;
  text-align: center;
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.ds-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  text-align: center;
  line-height: 1.5;
}
.ds-table tbody tr:last-child td { border-bottom: none; }
.ds-table tbody tr:hover { background: #f5f6fc; }
.ds-table td.system { font-weight: 700; color: var(--primary-dark); white-space: nowrap; text-align: left; }
.ds-table td.team { text-align: left; white-space: nowrap; line-height: 1.25; }
.ds-table td.team .team-name { display: block; font-weight: 700; color: var(--primary-dark); }
.ds-table td.team .team-handle { display: block; font-size: 0.82rem; color: var(--muted); font-weight: 500; }
.ds-table td.team .team-handle::before { content: "@"; opacity: 0.6; }
.ds-table tr.is-informal td.team .team-name { color: var(--muted); }
.ds-table td.final { font-weight: 800; color: var(--text); }
.ds-table .rank { font-weight: 800; color: var(--primary-dark); }
.ds-table .medal { font-size: 1.05rem; }
.ds-table tr.is-informal td { color: var(--muted); }
.ds-table tr.is-informal td.system { color: var(--muted); }
.ds-table tr.is-baseline { background: #fdf2f8; }
.ds-table tr.is-baseline:hover { background: #fce7f3; }
.ds-table tr.is-noncompeting { background: #f5f3ff; }
.ds-table tr.is-noncompeting:hover { background: #ede9fe; }
.ds-table tr.is-noncompeting td.team .team-name { color: #5b21b6; }
/* These rows never carried a .rank class before, so the shared .rank styling
   (bold, indigo) must not newly apply to their "–" placeholder. */
.ds-table tr.is-baseline td.rank,
.ds-table tr.is-informal td.rank,
.ds-table tr.is-noncompeting td.rank { font-weight: 700; color: inherit; }

/* Sub-metric detail (collapsible) */
.detail { margin-top: 14px; }
.detail > summary {
  cursor: pointer;
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
  user-select: none;
}
.detail > summary::-webkit-details-marker { display: none; }
.detail > summary::before { content: "▸ "; }
.detail[open] > summary::before { content: "▾ "; }
.detail .ds-table { font-size: 0.9rem; }
.detail .ds-table th, .detail .ds-table td { padding: 9px 12px; }

/* ---------- Status badges ---------- */
.status-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 4px;
  white-space: nowrap;
  color: #fff;
}
.status-badge.b-baseline { background: var(--accent-pink); }
.status-badge.b-dq { background: #b91c1c; }
.status-badge.b-nc { background: #6b7280; }
.status-badge.b-noncompeting { background: #7c3aed; }
.status-badge.b-rank { background: var(--primary); }
.status-badge.b-ok { background: #16a34a; }

/* ---------- Status legend ---------- */
.status-legend { margin-top: 22px; }
.status-legend .legend-title {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin: 0 0 12px;
}
.legend-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 15px 7px 8px;
  font-size: 0.9rem;
  color: var(--muted);
}
.legend-note { color: var(--muted); font-size: 0.9rem; margin: 14px 0 0; }
.legend-note b { color: var(--text); }

/* ---------- Scoring notes ---------- */
.score-head {
  font-size: 1.25rem;
  color: var(--primary-dark);
  margin: 30px 0 8px;
}
.score-head:first-of-type { margin-top: 6px; }
.score-desc { color: var(--muted); margin: 0 0 4px; }
.notes-list { margin: 8px 0 0; padding-left: 20px; }
.notes-list li { margin-bottom: 12px; }
.formula {
  display: block;
  overflow-x: auto;
  margin: 6px 0;
}
.legend { color: var(--muted); font-size: 0.9rem; }
.legend b { color: var(--text); }
.muted { color: var(--muted); }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 32px 16px 48px;
  color: var(--muted);
  font-size: 0.88rem;
  background: var(--bg-alt);
}
.footer a { color: var(--primary-dark); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .navbar { padding: 16px 20px; }
  .navbar.is-scrolled { padding: 12px 20px; }
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 12px 20px 18px;
    background: rgba(30, 27, 75, 0.97);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease, padding 0.25s ease;
  }
  .nav-links.is-open { max-height: 340px; }
  .hero { padding: 56px 20px 64px; }
  .hero h1 { font-size: 2rem; }
  main { padding: 0 18px; }
  .track-card { padding: 22px 18px 18px; }
  .rank-toggle { margin-left: 0; width: 100%; justify-content: center; }
  .podium { grid-template-columns: 1fr; gap: 10px; }
  .podium-card.p1 { transform: none; }
  .podium-card.p1:hover { transform: translateY(-3px); }
}