/* =========================================================
   YUSY 科学+ 2026 — Greater Bay Area Youth Earth Science Contest
   Shared stylesheet for zh-CN / zh-TW / en
   ========================================================= */

:root {
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fc;
  --c-bg-sky: #eef4ff;
  --c-ink: #0b1220;
  --c-ink-2: #334155;
  --c-mute: #64748b;
  --c-line: #e5e7eb;
  --c-line-2: #d6deea;

  --c-brand: #0b3d91;        /* deep space blue */
  --c-brand-2: #1e6fd9;      /* mid blue */
  --c-accent: #06b6d4;       /* AI cyan */
  --c-accent-2: #7c3aed;     /* AI violet */
  --c-earth: #0a7c3a;        /* earth green */
  --c-earth-2: #15a34a;
  --c-sun: #f59e0b;          /* warm highlight */
  --c-magma: #e11d48;        /* alert / fire */

  --grad-brand: linear-gradient(135deg, #0b3d91 0%, #1e6fd9 45%, #06b6d4 100%);
  --grad-ai: linear-gradient(135deg, #06b6d4 0%, #7c3aed 100%);
  --grad-earth: linear-gradient(135deg, #0a7c3a 0%, #15a34a 100%);
  --grad-hero: radial-gradient(1200px 600px at 80% -10%, rgba(124,58,237,.18), transparent 60%),
               radial-gradient(900px 500px at 10% 10%, rgba(6,182,212,.18), transparent 60%),
               linear-gradient(180deg, #0b1f47 0%, #08153a 60%, #050d24 100%);

  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 1px rgba(15,23,42,.04);
  --shadow-md: 0 8px 24px rgba(15,23,42,.08), 0 2px 6px rgba(15,23,42,.04);
  --shadow-lg: 0 20px 50px rgba(15,23,42,.15);

  --radius: 14px;
  --radius-lg: 22px;

  --container: 1180px;

  --font-cn: "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-tw: "PingFang TC", "Microsoft JhengHei", "HarmonyOS Sans TC", "Source Han Sans TC", "Noto Sans TC", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
html[lang="zh-TW"] body { font-family: var(--font-tw); }
html[lang="en"] body { font-family: var(--font-en); }

img, svg { max-width: 100%; display: block; }
a { color: var(--c-brand-2); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--c-accent-2); }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 78px;
}
.brand { display: flex; align-items: center; gap: 14px; color: var(--c-ink); }
.brand:hover { color: var(--c-ink); }
.brand object, .brand svg, .brand img { height: 52px; width: auto; }
.brand-tag {
  display: inline-flex; align-items: center; padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  color: #fff; background: var(--grad-ai);
}

.nav-menu { display: flex; gap: 4px; align-items: center; }
.nav-menu a {
  padding: 8px 12px; border-radius: 10px;
  font-size: 14.5px; font-weight: 500; color: var(--c-ink-2);
}
.nav-menu a:hover { background: var(--c-bg-sky); color: var(--c-brand); }

.nav-right { display: flex; gap: 10px; align-items: center; }
.lang-switch {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 8px; border: 1px solid var(--c-line);
  border-radius: 999px; background: #fff;
  font-size: 13px;
}
.lang-switch a {
  padding: 3px 9px; border-radius: 999px; color: var(--c-mute); font-weight: 500;
}
.lang-switch a.active { background: var(--c-ink); color: #fff; }
.lang-switch a:hover:not(.active) { background: var(--c-bg-sky); color: var(--c-brand); }

.menu-toggle {
  display: none; background: none; border: 1px solid var(--c-line);
  border-radius: 10px; padding: 8px 10px; cursor: pointer;
}
.menu-toggle span { display: block; width: 18px; height: 2px; background: var(--c-ink); margin: 4px 0; border-radius: 1px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary { background: var(--grad-brand); color: #fff; box-shadow: 0 6px 18px rgba(30,111,217,.35); }
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 10px 24px rgba(30,111,217,.45); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border-color: rgba(255,255,255,.25); }
.btn-ghost:hover { color: #fff; background: rgba(255,255,255,.15); }
.btn-outline { background: #fff; color: var(--c-brand); border-color: var(--c-line); }
.btn-outline:hover { color: var(--c-brand); border-color: var(--c-brand-2); }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: var(--grad-hero);
  color: #e8eefc;
  padding: 84px 0 96px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(2px 2px at 12% 20%, rgba(255,255,255,.7), transparent 50%),
    radial-gradient(2px 2px at 78% 65%, rgba(255,255,255,.6), transparent 50%),
    radial-gradient(1.5px 1.5px at 35% 75%, rgba(255,255,255,.5), transparent 50%),
    radial-gradient(1.5px 1.5px at 88% 18%, rgba(255,255,255,.55), transparent 50%),
    radial-gradient(2px 2px at 55% 38%, rgba(255,255,255,.45), transparent 50%);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: rgba(255,255,255,.12); color: #b9d3ff;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  border: 1px solid rgba(255,255,255,.18);
}
.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.15; font-weight: 800; letter-spacing: -.01em;
  color: #fff;
}
.hero h1 .hl {
  background: linear-gradient(90deg, #67e8f9, #c4b5fd);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub {
  max-width: 720px;
  font-size: clamp(16px, 1.4vw, 19px);
  color: #c8d4ec; margin-bottom: 28px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  margin-top: 56px; padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.12);
}
.hero-meta .item .k { font-size: 12.5px; color: #93a5c5; letter-spacing: .08em; text-transform: uppercase; }
.hero-meta .item .v { margin-top: 6px; font-size: 18px; font-weight: 700; color: #fff; }
.hero-meta .item .v small { display: block; font-weight: 400; font-size: 13px; color: #b6c5e3; margin-top: 4px; }

/* ===== Sections ===== */
.section { padding: 88px 0; }
.section.alt { background: var(--c-bg-soft); }
.section.dark { background: #0b1e3f; color: #d8e3fb; }
.section.dark .section-title { color: #fff; }
.section.dark .section-lead { color: #bccae8; }

.section-head { max-width: 760px; margin: 0 auto 48px; text-align: center; }
.section-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--c-brand-2);
}
.section-title {
  margin: 10px 0 14px;
  font-size: clamp(26px, 3.2vw, 38px); font-weight: 800;
  letter-spacing: -.005em; color: var(--c-ink);
}
.section-lead { color: var(--c-ink-2); font-size: 17px; }

/* ===== Cards ===== */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 28px; transition: transform .2s ease, box-shadow .25s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--c-line-2); }
.card .icon {
  width: 48px; height: 48px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; color: #fff; margin-bottom: 16px;
  background: var(--grad-brand);
}
.card h3 { margin: 0 0 8px; font-size: 19px; font-weight: 700; }
.card p { margin: 0; color: var(--c-ink-2); font-size: 15px; line-height: 1.65; }

/* ===== Tracks grid (5 tracks) ===== */
.tracks {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px;
}
.track-card {
  position: relative; overflow: hidden;
  border-radius: var(--radius-lg);
  padding: 28px 26px; color: #fff;
  background: var(--grad-brand);
  min-height: 220px;
  display: flex; flex-direction: column; justify-content: space-between;
  box-shadow: var(--shadow-md);
  transition: transform .2s ease, box-shadow .2s ease;
}
.track-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.track-card[data-track="S1"] { background: linear-gradient(135deg, #0a7c3a, #15a34a 60%, #65a30d); }
.track-card[data-track="S2"] { background: linear-gradient(135deg, #7c2d12, #b45309 55%, #ea580c); }
.track-card[data-track="S3"] { background: linear-gradient(135deg, #1e1b4b, #4338ca 55%, #7c3aed); }
.track-card[data-track="S4"] { background: linear-gradient(135deg, #166534, #16a34a 55%, #84cc16); }
.track-card[data-track="S5"] { background: linear-gradient(135deg, #0c4a6e, #0284c7 55%, #06b6d4); }
.track-card[data-track="S6"] { background: linear-gradient(135deg, #1e293b, #475569 50%, #38bdf8); }
.track-card[data-track="S7"] { background: linear-gradient(135deg, #581c87, #9333ea 55%, #c026d3); }
.tracks-group-title {
  display: flex; align-items: center; gap: 10px;
  margin: 30px 0 16px; font-size: 16px; font-weight: 800;
  color: var(--c-brand); letter-spacing: .01em;
}
.tracks-group-title::before {
  content: ""; width: 22px; height: 3px; border-radius: 2px; background: var(--grad-brand);
}
.track-card::after {
  content: ""; position: absolute; right: -40px; top: -40px;
  width: 140px; height: 140px; border-radius: 50%;
  background: rgba(255,255,255,.08);
}
.track-card .code {
  display: inline-flex; align-items: center;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(255,255,255,.18); font-size: 12px; font-weight: 700; letter-spacing: .08em;
}
.track-card h3 { margin: 14px 0 8px; font-size: 22px; font-weight: 700; color: #fff; }
.track-card p { font-size: 14.5px; color: rgba(255,255,255,.92); line-height: 1.65; margin: 0; }

/* ===== Tracks wheel (七大赛道圆盘) ===== */
.tracks-wheel {
  display: grid; grid-template-columns: 320px 360px; gap: 40px; align-items: center;
  justify-content: center; margin-top: 8px;
}
.tw-wheelbox { position: relative; width: 100%; max-width: 320px; margin: 0 auto; }
.tw-wheel { display: block; width: 100%; height: auto; overflow: visible; }
.tw-seg {
  cursor: pointer; transform-origin: 300px 300px;
  transition: transform .25s cubic-bezier(.2,.8,.2,1), filter .25s ease;
  outline: none;
}
.tw-seg .tw-lbl { pointer-events: none; fill: #fff; font-weight: 800; text-anchor: middle; }
.tw-seg .tw-code { font-size: 12px; font-weight: 700; opacity: .85; letter-spacing: .05em; }
.tw-seg .tw-name { font-size: 16px; }
.tw-seg .tw-ico { font-size: 22px; text-anchor: middle; pointer-events: none; }
.tw-wheel.has-active .tw-seg { filter: saturate(.5) brightness(.82); }
.tw-wheel.has-active .tw-seg.active { filter: none; transform: scale(1.045); }
.tw-seg:hover, .tw-seg:focus-visible { filter: none !important; }
.tw-hub { fill: #fff; stroke: var(--c-line); stroke-width: 1.5; }
.tw-hub-t1 { text-anchor: middle; font-size: 22px; font-weight: 800; fill: var(--c-ink); }
.tw-hub-t2 { text-anchor: middle; font-size: 12px; font-weight: 700; fill: var(--c-mute); letter-spacing: .1em; }
.tw-ring-cap { font-size: 13px; font-weight: 800; letter-spacing: .04em; }

.tw-panel {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: 26px 24px; background: var(--c-bg-soft);
  min-height: 300px; transition: border-color .25s ease;
}
.tw-ptag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 800; padding: 4px 11px; border-radius: 999px;
  color: #fff; letter-spacing: .04em;
}
.tw-pcode { font-size: 13px; font-weight: 700; color: var(--c-mute); letter-spacing: .1em; margin: 18px 0 2px; }
.tw-panel h3 { font-size: 26px; font-weight: 800; margin: 2px 0 14px; }
.tw-panel p { color: var(--c-ink-2); font-size: 15px; line-height: 1.7; margin: 0; }
.tw-panel p.tw-hint { color: var(--c-mute); }
.tw-legend { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 22px; }
.tw-legend span { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--c-ink-2); font-weight: 600; }
.tw-legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

@media (max-width: 760px) {
  .tracks-wheel { grid-template-columns: 1fr; gap: 24px; }
  .tw-wheelbox { max-width: 300px; margin: 0 auto; }
  .tw-panel { max-width: 460px; margin: 0 auto; }
}

/* ===== Stages / two-column rows ===== */
.split {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: start;
}
.split .col-feature {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); padding: 28px;
}
.kv-list { list-style: none; padding: 0; margin: 0; }
.kv-list li {
  display: grid; grid-template-columns: 140px 1fr; gap: 16px;
  padding: 14px 0; border-bottom: 1px dashed var(--c-line);
  font-size: 15.5px;
}
.kv-list li:last-child { border-bottom: none; }
.kv-list .k { color: var(--c-mute); font-weight: 600; }
.kv-list .v { color: var(--c-ink); }

/* ===== Timeline ===== */
.timeline {
  position: relative; max-width: 880px; margin: 0 auto;
}
.timeline::before {
  content: ""; position: absolute; left: 24px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, var(--c-brand-2), var(--c-accent-2));
}
.tl-item { position: relative; padding: 18px 0 18px 64px; }
.tl-item::before {
  content: ""; position: absolute; left: 16px; top: 26px;
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 3px solid var(--c-brand-2);
  box-shadow: 0 0 0 4px rgba(30,111,217,.15);
}
.tl-item .date { font-size: 13px; font-weight: 700; color: var(--c-brand-2); letter-spacing: .04em; }
.tl-item h4 { margin: 4px 0 6px; font-size: 18px; font-weight: 700; }
.tl-item p { margin: 0; color: var(--c-ink-2); font-size: 15px; }

/* ===== Tables ===== */
.tbl-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--c-line); }
table.tbl {
  width: 100%; border-collapse: collapse; background: #fff; font-size: 15px;
}
.tbl thead th {
  background: var(--c-bg-sky); color: var(--c-ink);
  text-align: left; padding: 14px 16px; font-weight: 700;
  border-bottom: 1px solid var(--c-line);
}
.tbl tbody td { padding: 14px 16px; border-bottom: 1px solid var(--c-line); color: var(--c-ink-2); vertical-align: top; }
.tbl tbody tr:last-child td { border-bottom: none; }
.tbl tbody tr:hover { background: var(--c-bg-soft); }
.tbl .pill {
  display: inline-flex; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700;
  background: var(--c-bg-sky); color: var(--c-brand);
}

/* ===== Awards ===== */
.awards-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px;
}
.award {
  position: relative; padding: 28px;
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  text-align: center; transition: transform .2s ease, box-shadow .2s ease;
}
.award:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.award .medal {
  width: 64px; height: 64px; margin: 0 auto 14px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 800; color: #fff;
}
.award.gold .medal   { background: linear-gradient(135deg, #fbbf24, #d97706); }
.award.silver .medal { background: linear-gradient(135deg, #cbd5e1, #64748b); }
.award.bronze .medal { background: linear-gradient(135deg, #d97706, #92400e); }
.award.excellent .medal { background: linear-gradient(135deg, #93c5fd, #1e6fd9); }
.award h4 { margin: 0 0 4px; font-size: 18px; font-weight: 700; }
.award .pct { font-size: 28px; font-weight: 800; color: var(--c-brand); margin: 8px 0; }
.award p { margin: 0; color: var(--c-ink-2); font-size: 14.5px; }

/* ===== CTA banner ===== */
.cta {
  position: relative; overflow: hidden;
  border-radius: 28px; padding: 56px 48px;
  background: var(--grad-brand); color: #fff;
  display: flex; gap: 32px; align-items: center; justify-content: space-between;
  box-shadow: var(--shadow-lg);
}
.cta::before {
  content: ""; position: absolute; right: -80px; top: -80px;
  width: 320px; height: 320px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.22), transparent 70%);
}
.cta h3 { margin: 0 0 8px; font-size: 28px; font-weight: 800; color: #fff; }
.cta p { margin: 0; color: rgba(255,255,255,.88); max-width: 560px; }
.cta .btn-outline { background: #fff; color: var(--c-brand); }

/* ===== FAQ ===== */
.faq { max-width: 880px; margin: 0 auto; }
details.faq-item {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius); margin-bottom: 12px;
  padding: 0;
}
details.faq-item summary {
  list-style: none; padding: 18px 22px; cursor: pointer;
  font-weight: 600; font-size: 16px;
  display: flex; justify-content: space-between; align-items: center;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: "+"; font-size: 22px; font-weight: 400; color: var(--c-brand-2); transition: transform .2s ease;
}
details.faq-item[open] summary::after { content: "−"; }
details.faq-item .ans { padding: 0 22px 20px; color: var(--c-ink-2); font-size: 15.5px; line-height: 1.75; }

/* ===== Footer ===== */
.site-footer {
  background: #0b1e3f; color: #b9c5dd;
  padding: 56px 0 30px;
}
.foot-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.foot-grid h5 { color: #fff; margin: 0 0 14px; font-size: 14px; letter-spacing: .04em; }
.foot-grid ul { list-style: none; padding: 0; margin: 0; }
.foot-grid li { padding: 5px 0; }
.foot-grid a { color: #b9c5dd; font-size: 14.5px; }
.foot-grid a:hover { color: #fff; }
.foot-brand p { margin: 18px 0 0; font-size: 14px; color: #94a3c2; max-width: 320px; line-height: 1.7; }
.foot-brand object, .foot-brand svg, .foot-brand img {
  height: 60px; width: auto;
  filter: brightness(0) invert(1);
}
.foot-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  color: #7d8aa6; font-size: 13.5px;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.muted { color: var(--c-mute); }
.tag {
  display: inline-flex; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700;
  background: var(--c-bg-sky); color: var(--c-brand);
}
.tag.ai { background: rgba(124,58,237,.12); color: var(--c-accent-2); }
.tag.earth { background: rgba(16,185,129,.12); color: var(--c-earth); }
.divider { height: 1px; background: var(--c-line); margin: 24px 0; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-menu { display: none; position: absolute; top: 78px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--c-line); padding: 12px 24px;
    flex-direction: column; align-items: stretch; gap: 0; }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 12px 8px; border-radius: 8px; }
  .menu-toggle { display: inline-block; }
  .hero-meta { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .split { grid-template-columns: 1fr; gap: 24px; }
  .kv-list li { grid-template-columns: 1fr; gap: 4px; padding: 12px 0; }
  .cta { flex-direction: column; align-items: flex-start; padding: 40px 28px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .section { padding: 64px 0; }
}
@media (max-width: 540px) {
  .hero { padding: 60px 0 72px; }
  .hero h1 { font-size: clamp(28px, 8vw, 38px); }
  .hero-meta { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .cta { padding: 32px 22px; }
  .cta h3 { font-size: 22px; }
}

/* Animations */
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   FORM (student registration)
   ========================================================= */
.page-head {
  padding: 60px 0 36px;
  background: linear-gradient(180deg, var(--c-bg-sky), #fff);
  border-bottom: 1px solid var(--c-line);
}
.page-head h1 { margin: 8px 0 10px; font-size: clamp(28px, 4vw, 42px); font-weight: 800; }
.page-head p { margin: 0; color: var(--c-ink-2); font-size: 17px; }

.form-shell {
  max-width: 880px; margin: -16px auto 0; padding: 0 24px 88px;
}
.form-card {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: 22px; box-shadow: var(--shadow-md);
  padding: 36px;
}
.form-card + .form-card { margin-top: 22px; }
.fs-title {
  display: flex; align-items: center; gap: 12px;
  margin: 0 0 6px; font-size: 20px; font-weight: 800;
}
.fs-title .num {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--grad-brand); color: #fff;
  font-size: 14px; font-weight: 800;
  display: inline-flex; align-items: center; justify-content: center;
}
.fs-desc { margin: 0 0 22px; color: var(--c-mute); font-size: 14.5px; }

.form-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 22px;
}
.form-grid .full { grid-column: 1 / -1; }

.field { display: flex; flex-direction: column; }
.field label {
  font-weight: 600; font-size: 14px; color: var(--c-ink);
  margin-bottom: 6px;
}
.field label .req { color: var(--c-magma); margin-left: 2px; }
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="month"],
.field input[type="date"],
.field input[type="password"],
.field select,
.field textarea {
  width: 100%; padding: 11px 14px;
  border: 1px solid var(--c-line-2); border-radius: 10px;
  background: #fff;
  font-size: 15px; font-family: inherit; color: var(--c-ink);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none; border-color: var(--c-brand-2);
  box-shadow: 0 0 0 3px rgba(30,111,217,.14);
}
.field textarea { resize: vertical; min-height: 100px; }
.field .hint { margin-top: 6px; font-size: 12.5px; color: var(--c-mute); }
.field.has-error input, .field.has-error select, .field.has-error textarea {
  border-color: var(--c-magma); box-shadow: 0 0 0 3px rgba(225,29,72,.12);
}
.field .err-msg { display: none; margin-top: 6px; font-size: 13px; color: var(--c-magma); }
.field.has-error .err-msg { display: block; }

/* radio / checkbox groups */
.opt-group { display: flex; gap: 10px; flex-wrap: wrap; }
.opt {
  position: relative; flex: 0 0 auto;
}
.opt input { position: absolute; opacity: 0; pointer-events: none; }
.opt label {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border: 1px solid var(--c-line-2);
  border-radius: 999px; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--c-ink-2);
  background: #fff;
  transition: border-color .15s, background .15s, color .15s;
  margin-bottom: 0;
}
.opt input:checked + label {
  border-color: var(--c-brand-2);
  background: var(--c-bg-sky); color: var(--c-brand);
}
.opt input:focus-visible + label {
  box-shadow: 0 0 0 3px rgba(30,111,217,.14);
}

/* track checkboxes (richer cards) */
.track-pick {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.track-pick .pick {
  border: 1px solid var(--c-line-2); border-radius: 14px;
  padding: 14px 16px; background: #fff;
  transition: border-color .15s, background .15s, box-shadow .15s;
}
.track-pick .pick.on {
  border-color: var(--c-brand-2);
  background: linear-gradient(180deg, var(--c-bg-sky), #fff);
  box-shadow: 0 4px 14px rgba(30,111,217,.10);
}
.track-pick .pick-head {
  display: flex; align-items: center; gap: 10px; cursor: pointer;
  user-select: none;
}
.track-pick .pick-head input { width: 18px; height: 18px; accent-color: var(--c-brand-2); }
.track-pick .pick-head .code {
  font-weight: 800; font-size: 13px;
  padding: 2px 8px; border-radius: 999px;
  background: var(--c-bg-sky); color: var(--c-brand);
}
.track-pick .pick-head .name { font-weight: 700; font-size: 15px; }
.track-pick .pick-body {
  margin-top: 10px; padding-top: 10px;
  border-top: 1px dashed var(--c-line);
  display: none;
}
.track-pick .pick.on .pick-body { display: block; }
.track-pick .pick-body .lbl { font-size: 12px; color: var(--c-mute); margin-bottom: 6px; font-weight: 600; }

.agree-row {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--c-bg-soft); border: 1px solid var(--c-line);
  border-radius: 12px; padding: 14px 16px;
}
.agree-row input { margin-top: 4px; width: 16px; height: 16px; accent-color: var(--c-brand-2); flex: none; }
.agree-row label { font-size: 14px; color: var(--c-ink-2); line-height: 1.7; font-weight: 500; }

.form-actions {
  display: flex; gap: 12px; justify-content: flex-end; align-items: center;
  margin-top: 28px;
}
.form-actions .btn { padding: 13px 28px; font-size: 15px; }
.form-actions .submit-state { font-size: 14px; color: var(--c-mute); }

/* =========================================================
   REGISTRATION CERTIFICATE (报名确认书)
   A4 portrait, print-ready, official-looking
   ========================================================= */
:root {
  --cert-gold:      #c89b3c;
  --cert-gold-deep: #9b7026;
  --cert-red:       #c81d25;
  --cert-ink:       #0a1428;
}

/* Action bar above the certificate */
.cert-actions {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 16px;
}
.cert-actions .btn { padding: 11px 22px; font-size: 14.5px; }
.cert-pdf-hint {
  margin: 0 0 22px; text-align: center; font-size: 13px; color: var(--c-mute);
}

/* The certificate sheet — sized to A4 portrait */
.cert-page {
  position: relative;
  width: 210mm;
  min-height: 297mm;
  max-width: 100%;
  margin: 0 auto;
  padding: 0;
  background: #fff;
  box-shadow: 0 18px 40px rgba(15,23,42,.18), 0 4px 10px rgba(15,23,42,.08);
  font-family: var(--font-cn);
  color: var(--cert-ink);
  overflow: hidden;
}
html[lang="zh-TW"] .cert-page { font-family: var(--font-tw); }
html[lang="en"] .cert-page { font-family: var(--font-en); }

/* Outer gold border with inner blue stroke */
.cert-border {
  position: relative;
  margin: 8mm;
  padding: 14mm 14mm 12mm;
  border: 3px double var(--cert-gold);
  outline: 1px solid var(--cert-gold);
  outline-offset: 3px;
  min-height: calc(297mm - 16mm);
  background:
    linear-gradient(180deg, rgba(11,61,145,.012) 0%, transparent 30%, transparent 70%, rgba(11,61,145,.012) 100%);
  box-sizing: border-box;
}

/* Corner ornaments */
.cert-border::before, .cert-border::after {
  content: ""; position: absolute; width: 28px; height: 28px;
  border: 2px solid var(--cert-gold-deep);
  pointer-events: none;
}
.cert-border::before { top: 6px; left: 6px; border-right: none; border-bottom: none; }
.cert-border::after  { bottom: 6px; right: 6px; border-left: none; border-top: none; }
.cert-corner-tr, .cert-corner-bl {
  position: absolute; width: 28px; height: 28px;
  border: 2px solid var(--cert-gold-deep); pointer-events: none;
}
.cert-corner-tr { top: 6px; right: 6px; border-left: none; border-bottom: none; }
.cert-corner-bl { bottom: 6px; left: 6px; border-right: none; border-top: none; }

/* Diagonal watermark text */
.cert-watermark {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 90px; font-weight: 900; letter-spacing: 8px;
  color: #0b3d91; opacity: .045;
  transform: rotate(-28deg);
  white-space: nowrap; pointer-events: none; user-select: none;
  z-index: 0;
}

/* ─────────── HEADER ─────────── */
.cert-head {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--cert-gold);
}
.cert-head .cert-logo object {
  height: 56px; width: auto;
}
.cert-head .cert-title { flex: 1; }
.cert-head .cert-org {
  margin: 0 0 4px;
  font-size: 12px; font-weight: 700; letter-spacing: .15em;
  color: var(--cert-gold-deep); text-transform: uppercase;
}
.cert-head h1 {
  margin: 0; font-size: 19px; font-weight: 800;
  color: var(--c-brand); line-height: 1.3;
  letter-spacing: .01em;
}
.cert-head .cert-sub {
  margin: 3px 0 0; font-size: 13.5px; font-weight: 600;
  color: var(--cert-ink);
}
.cert-head .cert-en {
  margin: 4px 0 0; font-size: 11.5px; font-style: italic;
  color: var(--c-mute); letter-spacing: .02em;
  font-family: var(--font-en);
}

/* ─────────── DOC TITLE ─────────── */
.cert-doctype {
  position: relative; z-index: 1;
  text-align: center; margin: 22px 0 18px;
}
.cert-doctype h2 {
  margin: 0; font-size: 30px; font-weight: 900;
  letter-spacing: .35em;
  color: var(--c-brand);
  position: relative; display: inline-block;
  padding: 0 36px;
}
.cert-doctype h2::before,
.cert-doctype h2::after {
  content: ""; position: absolute; top: 50%;
  width: 24px; height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--cert-gold) 30%, var(--cert-gold) 70%, transparent);
}
.cert-doctype h2::before { left: -8px; }
.cert-doctype h2::after  { right: -8px; }
.cert-doctype p {
  margin: 4px 0 0; font-size: 11px;
  letter-spacing: .35em; color: var(--cert-gold-deep);
  font-weight: 700; font-family: var(--font-en);
}

/* ─────────── ID BOX ─────────── */
.cert-id-box {
  position: relative; z-index: 1;
  margin: 0 auto 22px; max-width: 360px;
  padding: 14px 22px;
  border: 1.5px solid var(--cert-gold);
  border-radius: 6px;
  background: linear-gradient(135deg, #fff8ec 0%, #fffbf0 100%);
  text-align: center;
  box-shadow: 0 2px 6px rgba(200,155,60,.12);
}
.cert-id-box .label {
  margin: 0; font-size: 11px; font-weight: 700;
  letter-spacing: .25em; color: var(--cert-gold-deep);
}
.cert-id-box .id-value {
  margin: 5px 0 4px;
  font-family: "Courier New", ui-monospace, monospace;
  font-size: 26px; font-weight: 800;
  color: var(--c-brand); letter-spacing: .08em;
}
.cert-id-box .id-time {
  margin: 0; font-size: 11.5px; color: var(--c-mute);
}

/* ─────────── INFO GRID ─────────── */
.cert-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px;
  margin-bottom: 16px;
}
.cert-section h3 {
  margin: 0 0 8px; padding-bottom: 4px;
  font-size: 13px; font-weight: 800;
  color: var(--c-brand);
  border-bottom: 1px solid var(--cert-gold);
  letter-spacing: .04em;
}
.cert-section h3 .en {
  margin-left: 6px; font-size: 11px; font-weight: 600;
  color: var(--c-mute); letter-spacing: .04em;
  font-family: var(--font-en);
}
.cert-dl {
  margin: 0; display: grid; grid-template-columns: 78px 1fr; gap: 5px 12px;
  font-size: 13px;
}
.cert-dl dt { color: var(--c-mute); font-weight: 600; }
.cert-dl dd { margin: 0; color: var(--cert-ink); font-weight: 600; word-break: break-word; }

/* ─────────── TRACKS TABLE ─────────── */
.cert-tracks {
  position: relative; z-index: 1;
  margin-bottom: 16px;
}
.cert-tracks h3 {
  margin: 0 0 8px; padding-bottom: 4px;
  font-size: 13px; font-weight: 800;
  color: var(--c-brand);
  border-bottom: 1px solid var(--cert-gold);
  letter-spacing: .04em;
}
.cert-tracks h3 .en { margin-left: 6px; font-size: 11px; font-weight: 600; color: var(--c-mute); }
.cert-tracks table {
  width: 100%; border-collapse: collapse; font-size: 13px;
}
.cert-tracks th, .cert-tracks td {
  padding: 7px 10px; border: 1px solid #e6dcc4;
  text-align: left;
}
.cert-tracks th {
  background: #fcf6e6; font-weight: 700; color: var(--cert-gold-deep);
  font-size: 11.5px; letter-spacing: .04em;
}
.cert-tracks td:first-child {
  font-family: "Courier New", monospace; font-weight: 800;
  color: var(--c-brand); width: 60px;
}
.cert-tracks td:last-child {
  width: 110px; font-weight: 600;
}

/* ─────────── NOTES ─────────── */
.cert-notes {
  position: relative; z-index: 1;
  padding: 12px 16px;
  background: #fbfaf3; border-left: 3px solid var(--cert-gold);
  border-radius: 0 6px 6px 0;
  margin-bottom: 22px;
}
.cert-notes h3 {
  margin: 0 0 6px; font-size: 12px; font-weight: 800;
  color: var(--cert-gold-deep); letter-spacing: .04em;
}
.cert-notes ul {
  margin: 0; padding-left: 18px;
  font-size: 12px; color: var(--c-ink-2); line-height: 1.75;
}
.cert-notes li { margin-bottom: 2px; }

/* ─────────── FOOTER (QR + Seal) ─────────── */
.cert-foot {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--cert-gold);
}
.cert-qr {
  text-align: center;
}
.cert-qr .qr-frame {
  width: 96px; height: 96px;
  padding: 6px; background: #fff;
  border: 1.5px solid var(--cert-gold);
  border-radius: 6px;
  margin: 0 auto 5px;
  display: flex; align-items: center; justify-content: center;
}
.cert-qr .qr-frame > div,
.cert-qr .qr-frame canvas,
.cert-qr .qr-frame img { width: 100% !important; height: 100% !important; }
.cert-qr .qr-cap {
  margin: 0; font-size: 11px; color: var(--c-ink-2); font-weight: 600;
  line-height: 1.4;
}
.cert-qr .qr-cap small { display: block; color: var(--c-mute); font-weight: 400; font-style: italic; }

.cert-issuer {
  text-align: right; font-size: 12px;
}
.cert-issuer .iss { margin: 0; line-height: 1.7; color: var(--cert-ink); font-weight: 600; }
.cert-issuer .date { margin: 5px 0 0; color: var(--c-mute); font-size: 11.5px; }
.cert-issuer .iss-en { font-style: italic; color: var(--c-mute); font-weight: 500; font-size: 11px; font-family: var(--font-en); }

/* Red round seal (公章) */
.cert-seal {
  width: 88px; height: 88px;
  display: flex; align-items: center; justify-content: center;
  transform: rotate(-8deg);
}
.cert-seal svg { width: 100%; height: 100%; }

@media (max-width: 900px) {
  .cert-page { width: 100%; min-height: auto; }
  .cert-border { margin: 4mm; padding: 10mm 8mm; }
  .cert-grid { grid-template-columns: 1fr; }
  .cert-doctype h2 { font-size: 24px; letter-spacing: .25em; }
  .cert-foot { grid-template-columns: 1fr; gap: 22px; }
  .cert-issuer { text-align: center; }
  .cert-watermark { font-size: 60px; }
}

/* =========================================================
   PRINT — only the certificate prints, no nav/footer/buttons
   ========================================================= */
@page {
  size: A4 portrait;
  margin: 0;
}
@media print {
  body { background: #fff !important; }
  .site-header, .site-footer, .page-head, .cert-actions, .cert-pdf-hint, .no-print { display: none !important; }
  .form-shell { padding: 0 !important; margin: 0 !important; max-width: none !important; }
  .cert-page {
    box-shadow: none !important;
    margin: 0 !important;
    width: 210mm !important;
    min-height: 297mm !important;
    page-break-after: avoid;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  .cert-border { margin: 6mm; }
}

/* =========================================================
   ADMIN
   ========================================================= */
.admin-login-page { min-height: 100vh; background: var(--grad-hero); }
.admin-login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.admin-login-card {
  width: 100%; max-width: 420px;
  background: #fff; border-radius: 22px;
  padding: 40px 36px; box-shadow: var(--shadow-lg);
}
.admin-login-card .logo { text-align: center; margin-bottom: 20px; }
.admin-login-card .logo object { height: 48px; width: auto; }
.admin-login-card h1 { margin: 0 0 6px; font-size: 22px; text-align: center; }
.admin-login-card .lead { margin: 0 0 26px; color: var(--c-mute); text-align: center; font-size: 14.5px; }
.admin-login-card .err {
  background: #fef2f2; color: var(--c-magma);
  padding: 10px 14px; border-radius: 10px;
  font-size: 14px; margin-bottom: 16px;
  border: 1px solid #fecaca;
}
.admin-login-card .err.hidden { display: none; }

.admin-shell { min-height: 100vh; background: var(--c-bg-soft); }
.admin-bar {
  position: sticky; top: 0; z-index: 30;
  background: #0b1e3f; color: #d8e3fb;
  padding: 14px 0; border-bottom: 1px solid #16284f;
}
.admin-bar .container {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.admin-bar .brand { color: #fff; display: flex; align-items: center; gap: 12px; }
.admin-bar .brand object { height: 36px; width: auto; filter: brightness(0) invert(1); }
.admin-bar .brand-tag { background: var(--grad-ai); }
.admin-bar .right { display: flex; gap: 10px; align-items: center; }
.admin-bar .user { color: #b9c5dd; font-size: 14px; }
.admin-bar .btn-logout {
  background: rgba(255,255,255,.08); color: #fff;
  padding: 7px 14px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600; border: 1px solid rgba(255,255,255,.2);
  cursor: pointer;
}
.admin-bar .btn-logout:hover { background: rgba(255,255,255,.16); }

.admin-main { padding: 32px 0 64px; }

.stat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin-bottom: 24px;
}
.stat {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: 14px; padding: 18px 20px;
}
.stat .k { font-size: 12.5px; color: var(--c-mute); font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.stat .v { font-size: 30px; font-weight: 800; margin-top: 4px; line-height: 1.1; }
.stat.t-total .v { color: var(--c-brand); }
.stat.t-pending .v { color: var(--c-sun); }
.stat.t-approved .v { color: #10b981; }
.stat.t-rejected .v { color: var(--c-magma); }

.toolbar {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--c-line);
  border-radius: 14px; padding: 14px 16px; margin-bottom: 18px;
}
.toolbar input[type="search"] {
  flex: 1; min-width: 200px;
  padding: 9px 14px; border: 1px solid var(--c-line-2);
  border-radius: 999px; font-size: 14px; font-family: inherit;
}
.toolbar input[type="search"]:focus { outline: none; border-color: var(--c-brand-2); box-shadow: 0 0 0 3px rgba(30,111,217,.12); }
.toolbar select {
  padding: 9px 14px; border: 1px solid var(--c-line-2);
  border-radius: 999px; font-size: 14px; font-family: inherit;
  background: #fff;
}

.admin-tbl-wrap {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: 14px; overflow: auto;
}
.admin-tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.admin-tbl thead th {
  background: var(--c-bg-soft);
  text-align: left; padding: 12px 14px;
  font-weight: 700; font-size: 13px;
  border-bottom: 1px solid var(--c-line); white-space: nowrap;
}
.admin-tbl tbody td {
  padding: 12px 14px; border-bottom: 1px solid var(--c-line);
  vertical-align: middle; color: var(--c-ink-2);
}
.admin-tbl tbody tr:last-child td { border-bottom: none; }
.admin-tbl tbody tr:hover { background: var(--c-bg-soft); }
.admin-tbl td.id { font-family: ui-monospace, Menlo, monospace; color: var(--c-brand); font-weight: 700; }
.admin-tbl td.actions { white-space: nowrap; }

.status-badge {
  display: inline-flex; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700;
}
.status-pending  { background: #fef3c7; color: #92400e; }
.status-approved { background: #d1fae5; color: #065f46; }
.status-rejected { background: #fee2e2; color: #991b1b; }

.icon-btn {
  background: transparent; border: 1px solid var(--c-line);
  border-radius: 8px; padding: 5px 9px; cursor: pointer;
  font-size: 12.5px; font-weight: 600; color: var(--c-ink-2);
  transition: background .15s, color .15s, border-color .15s;
  margin-right: 4px;
}
.icon-btn:hover { background: var(--c-bg-sky); color: var(--c-brand); border-color: var(--c-brand-2); }
.icon-btn.danger:hover { background: #fee2e2; color: var(--c-magma); border-color: var(--c-magma); }
.icon-btn.ok:hover { background: #d1fae5; color: #065f46; border-color: #10b981; }

.empty-row {
  padding: 60px 20px !important; text-align: center; color: var(--c-mute);
}

/* modal */
.modal-bg {
  position: fixed; inset: 0; background: rgba(11,30,63,.55);
  display: none; align-items: center; justify-content: center;
  z-index: 60; padding: 20px;
}
.modal-bg.show { display: flex; }
.modal {
  background: #fff; border-radius: 18px;
  width: 100%; max-width: 640px;
  max-height: calc(100vh - 40px); overflow: auto;
  box-shadow: var(--shadow-lg);
}
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 22px; border-bottom: 1px solid var(--c-line);
}
.modal-head h3 { margin: 0; font-size: 18px; }
.modal-head .close {
  background: none; border: none; cursor: pointer;
  font-size: 24px; color: var(--c-mute); line-height: 1;
}
.modal-body { padding: 22px; }
.modal-body .kv {
  display: grid; grid-template-columns: 100px 1fr;
  gap: 6px 14px; padding: 10px 0;
  border-bottom: 1px dashed var(--c-line);
  font-size: 14.5px;
}
.modal-body .kv:last-child { border-bottom: none; }
.modal-body .kv .k { color: var(--c-mute); font-weight: 600; }
.modal-body h4 {
  margin: 18px 0 4px; font-size: 14px;
  color: var(--c-brand); letter-spacing: .04em; text-transform: uppercase;
}

@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .form-card { padding: 26px 22px; }
  .admin-tbl { font-size: 13px; }
  .admin-tbl thead { display: none; }
  .admin-tbl tbody td { display: block; padding: 6px 16px; border: none; }
  .admin-tbl tbody tr { display: block; border-bottom: 1px solid var(--c-line); padding: 12px 0; }
  .admin-tbl tbody td::before { content: attr(data-label) ": "; font-weight: 700; color: var(--c-mute); }
  .admin-tbl td.actions { padding-top: 12px; }
}

/* ===================================================================
   Heritage / History — 赛事传承 & 历届回顾 (added 2026-06)
   =================================================================== */

/* Achievement stats row (homepage heritage band + history page) */
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin: 8px 0 4px;
}
.stat {
  text-align: center; padding: 22px 14px;
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
}
.stat .num {
  font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; line-height: 1.05;
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .num small { font-size: .5em; font-weight: 700; -webkit-text-fill-color: var(--c-brand-2); }
.stat .lbl { display: block; margin-top: 8px; font-size: 14px; color: var(--c-mute); font-weight: 600; }

/* Host alliance — member societies as chips */
.org-grid {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  margin-top: 8px;
}
.org-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px;
  background: var(--c-bg-sky); border: 1px solid var(--c-line-2);
  font-size: 14.5px; font-weight: 600; color: var(--c-brand);
}
.org-chip::before { content: "◆"; font-size: 10px; color: var(--c-accent); }
.org-lead { text-align: center; color: var(--c-ink-2); max-width: 760px; margin: 0 auto 18px; }

/* History page — per-edition eras */
.era {
  position: relative; display: grid; grid-template-columns: 132px 1fr; gap: 24px;
  padding: 26px 0; border-top: 1px solid var(--c-line);
}
.era:first-of-type { border-top: none; }
.era-year {
  font-size: 30px; font-weight: 800; line-height: 1;
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.era-no { display: block; margin-top: 6px; font-size: 13px; font-weight: 700; color: var(--c-mute); letter-spacing: .04em; }
.era-body h3 { margin: 0 0 6px; font-size: 20px; font-weight: 800; color: var(--c-ink); }
.era-body p { margin: 0 0 12px; color: var(--c-ink-2); font-size: 15.5px; line-height: 1.7; }
.era-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.era-tags span {
  font-size: 12.5px; font-weight: 600; color: var(--c-brand);
  background: var(--c-bg-sky); border: 1px solid var(--c-line); border-radius: 6px;
  padding: 4px 10px;
}
.era-tags span.hl { background: var(--grad-ai); color: #fff; border-color: transparent; }

@media (max-width: 720px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .era { grid-template-columns: 1fr; gap: 8px; }
  .era-year { font-size: 26px; }
}

/* ===================================================================
   Resources / 备赛资料 (added 2026-06)
   =================================================================== */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); gap: 16px; }
.dl-card {
  display: flex; flex-direction: column; gap: 4px;
  padding: 20px 20px 18px; background: #fff;
  border: 1px solid var(--c-line); border-radius: var(--radius);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.dl-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--c-line-2); }
.dl-card .dl-kind { font-size: 12px; font-weight: 700; color: var(--c-brand-2); letter-spacing: .05em; text-transform: uppercase; }
.dl-card h4 { margin: 4px 0 4px; font-size: 16px; font-weight: 800; color: var(--c-ink); }
.dl-card p { margin: 0 0 14px; font-size: 13.5px; line-height: 1.6; color: var(--c-mute); flex: 1; }
.dl-card .dl-btn { align-self: flex-start; padding: 8px 16px; font-size: 13.5px; }
.dl-card .dl-meta { font-size: 12px; color: var(--c-mute); margin-top: 8px; }

/* Syllabus domain accordion reuses .faq; track-mapping table reuses .tbl */
.skill-box {
  border: 1px solid var(--c-line-2); border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--c-bg-sky), #fff);
  padding: 26px 28px;
}
.skill-box h3 { margin: 0 0 8px; font-size: 20px; font-weight: 800; }
.skill-box .skill-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.skill-box .skill-tags span {
  font-size: 13px; font-weight: 600; color: var(--c-brand);
  background: #fff; border: 1px solid var(--c-line); border-radius: 999px; padding: 5px 13px;
}

/* Post-registration reminder banner (success view, screen only) */
.reg-reminder {
  display: flex; gap: 14px; align-items: flex-start;
  max-width: 880px; margin: 0 auto 20px; padding: 16px 20px;
  background: linear-gradient(135deg, var(--c-bg-sky), #fff);
  border: 1px solid var(--c-line-2); border-radius: var(--radius);
}
.reg-reminder .rr-ico { font-size: 22px; line-height: 1.25; }
.reg-reminder .rr-txt { font-size: 14.5px; color: var(--c-ink-2); line-height: 1.6; }
.reg-reminder .rr-txt strong { color: var(--c-brand); }