:root{
  --bg:#0d1520;
  --bg-2:#121c28;
  --panel:#172535;
  --panel-2:#1c2d40;
  --sheet:#f4efe8;
  --ink:#e8f0f5;
  --ink-soft:#c2d0da;
  --muted:#8ca1b1;
  --accent:#63c7d8;
  --accent-2:#ffb15c;
  --line:rgba(255,255,255,.1);
  --line-strong:rgba(255,255,255,.16);
  --shadow:0 30px 80px rgba(0,0,0,.38);
  --shadow-soft:0 14px 30px rgba(0,0,0,.22);
  --radius-xl:32px;
  --radius-lg:22px;
  --radius-sm:14px;
  --max:1200px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;min-width:320px;min-height:100%}
body{
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
  line-height:1.75;
  background:
    radial-gradient(circle at 12% 12%, rgba(99,199,216,.18), transparent 18%),
    radial-gradient(circle at 88% 18%, rgba(255,177,92,.12), transparent 16%),
    radial-gradient(circle at 70% 88%, rgba(99,199,216,.08), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size:48px 48px;
  opacity:.45;
  mask-image:linear-gradient(180deg, rgba(0,0,0,.65), transparent 88%);
}
a{color:inherit;text-decoration:none}
p,ul,ol,figure{margin:0}
img{display:block;max-width:100%;height:auto}
.skip-link{position:absolute;left:-999px;top:10px;z-index:100;padding:10px 14px;border-radius:999px;background:#fff;color:#111;box-shadow:var(--shadow-soft)}
.skip-link:focus{left:12px}
.page{
  width:min(var(--max), calc(100vw - 24px));
  margin:0 auto;
  padding:14px 0 40px;
  position:relative;
  z-index:1;
}
.masthead{
  position:sticky;
  top:10px;
  z-index:30;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  margin-bottom:18px;
  padding:14px 18px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(14,22,33,.82);
  backdrop-filter:blur(16px);
  box-shadow:var(--shadow-soft);
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
  background:linear-gradient(135deg, var(--accent), #2f8292);
  color:#081018;font-weight:900;font-size:1rem;flex:0 0 auto
}
.brand-copy{display:grid;gap:2px;min-width:0}
.brand-copy strong{font-size:1rem;letter-spacing:.02em}
.brand-copy span,.eyebrow{font-size:.82rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
.nav a,.back-link{
  padding:9px 14px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.05)
}
.nav a:hover,.back-link:hover{border-color:var(--line-strong);transform:translateY(-1px)}
.page--dark .panel,.page--dark .about-panel,.page--dark .cover-card,.page--dark .cover-figure,.page--dark .type-card,.page--dark .route-item,.page--dark .footer-card{
  border:1px solid var(--line);
  border-radius:var(--radius-xl);
  background:linear-gradient(180deg, rgba(23,37,53,.96), rgba(18,28,40,.96));
  box-shadow:var(--shadow);
}
.cover-grid{
  display:grid;
  grid-template-columns:minmax(0,1.02fr) minmax(320px,.98fr);
  gap:18px;
  align-items:stretch;
}
.cover-card{
  padding:24px;
  display:grid;
  align-content:start;
  gap:16px;
}
.cover-card h1{margin:0;line-height:1.14;font-size:clamp(2.1rem, 5vw, 4.3rem);max-width:12ch}
.lead{max-width:56ch;color:var(--ink-soft);font-size:1rem}
.tag-row{
  display:flex;flex-wrap:wrap;gap:10px
}
.tag-row span,.mini-rules span{
  padding:10px 14px;border-radius:999px;background:rgba(99,199,216,.12);border:1px solid rgba(99,199,216,.16);color:#dff6fa
}
.cover-figure{
  margin:0;
  padding:14px;
  display:grid;
  gap:10px;
  background:
    radial-gradient(circle at 75% 14%, rgba(99,199,216,.18), transparent 26%),
    radial-gradient(circle at 15% 90%, rgba(255,177,92,.12), transparent 24%),
    linear-gradient(160deg, rgba(25,39,56,.96), rgba(18,28,40,.96));
}
.cover-figure img{
  border-radius:24px;
  aspect-ratio:14/10;
  object-fit:cover;
  background:#0f1721;
}
.cover-figure figcaption{color:var(--ink-soft);font-size:.94rem}
.section-head{display:grid;gap:8px;margin-bottom:16px}
.section-head h2,.panel h2,.about-panel h1{margin:0;line-height:1.18}
.section-head--dark h2{font-size:clamp(1.5rem, 3vw, 2.1rem)}
.type-board,.split-board,.route-strip,.footer-board,.about-shell{margin-top:18px}
.type-board,.route-strip,.footer-board{
  padding:22px;
  border-radius:var(--radius-xl);
  border:1px solid var(--line);
  background:rgba(15,25,36,.82);
  box-shadow:var(--shadow);
}
.type-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:14px;
}
.type-card{
  padding:18px;
  display:grid;
  gap:10px;
}
.type-card h3{margin:0;font-size:1.08rem}
.type-card p{color:var(--ink-soft)}
.type-card--accent{
  background:
    radial-gradient(circle at 82% 16%, rgba(99,199,216,.18), transparent 26%),
    linear-gradient(180deg, rgba(23,37,53,.98), rgba(18,28,40,.98));
}
.split-board{
  display:grid;
  grid-template-columns:1.08fr .92fr;
  gap:18px;
}
.panel,.about-panel{
  padding:22px;
}
.panel--note{
  display:grid;
  gap:14px;
  align-content:start;
}
.big-note{font-size:1.12rem;color:var(--ink-soft)}
.judge-list,.about-list{
  margin:14px 0 0;
  padding-left:20px;
  display:grid;
  gap:12px;
  color:var(--ink-soft);
}
.mini-rules{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.route-grid{
  display:grid;
  grid-template-columns:repeat(3, minmax(0,1fr));
  gap:14px;
}
.route-item{
  padding:18px;
  display:grid;
  gap:8px;
}
.route-item strong{font-size:1.02rem}
.route-item p,.footer-card p,.about-panel p{color:var(--ink-soft)}
.footer-card{display:grid;gap:12px}
.footer{
  margin-top:20px;
  padding:14px 6px 0;
  display:flex;
  justify-content:space-between;
  gap:18px;
  flex-wrap:wrap;
  color:var(--muted);
}
.about-shell{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:18px;
}
.about-panel{display:grid;gap:12px}
.about-panel--hero{grid-column:1 / span 2}
.back-link--dark{background:rgba(99,199,216,.12)}
@media (max-width: 980px){
  .masthead{position:relative;top:auto;border-radius:28px}
  .cover-grid,.split-board,.about-shell{grid-template-columns:1fr}
  .type-grid,.route-grid{grid-template-columns:1fr}
  .about-panel--hero{grid-column:auto}
}
@media (max-width: 640px){
  .page{width:min(var(--max), calc(100vw - 14px));padding:8px 0 24px}
  .masthead{padding:12px 14px}
  .cover-card,.cover-figure,.type-board,.route-strip,.footer-board,.panel,.about-panel{padding:16px}
  .cover-card h1{font-size:clamp(1.9rem, 11vw, 3rem)}
  .nav{justify-content:flex-start}
  .footer{font-size:.95rem}
}