/* ============================================================
   学生会分会办公室 · 招新官网  深色玻璃拟态科技风（多页面）
   ============================================================ */

:root {
  --bg0: #05070d;
  --bg1: #0a0f1c;
  --ink: #e7ecf5;
  --muted: #9aa7bd;
  --muted2: #6b778e;
  --cyan: #38bdf8;
  --indigo: #6366f1;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --green: #34d399;
  --grad: linear-gradient(120deg, #38bdf8 0%, #6366f1 48%, #a78bfa 100%);
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-bg2: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-hi: rgba(255, 255, 255, 0.14);
  --radius: 20px;
  --radius-sm: 12px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg0);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input { font-family: inherit; }
ul { list-style: none; }

/* ---------- 背景层 ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(60% 45% at 12% 8%, rgba(56, 189, 248, 0.15), transparent 60%),
    radial-gradient(55% 45% at 88% 18%, rgba(139, 92, 246, 0.17), transparent 62%),
    radial-gradient(50% 40% at 50% 100%, rgba(99, 102, 241, 0.13), transparent 60%),
    linear-gradient(180deg, #05070d 0%, #0a0f1c 100%);
}
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(80% 60% at 50% 0%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 0%, #000 0%, transparent 70%);
}
#net {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.9;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ---------- 通用 ---------- */
.wrap { width: min(1120px, 100% - 40px); margin: 0 auto; }
.section { padding: 96px 0; position: relative; }
.section--alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.018), transparent); }

.sec-head { margin-bottom: 44px; }
.sec-head--center { text-align: center; }
.sec-head--center .sec-head__lead { margin-left: auto; margin-right: auto; }
.sec-head__overline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--cyan);
  text-transform: uppercase;
}
.sec-head__title {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 8px;
  line-height: 1.2;
}
.sec-head__lead {
  max-width: 780px;
  color: var(--muted);
  font-size: 16px;
  margin-top: 16px;
}

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- 子页面页头 ---------- */
.page { padding: 150px 0 20px; min-height: 60vh; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  padding: 13px 24px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s, background 0.25s, border-color 0.25s;
  will-change: transform;
}
.btn svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.btn:active { transform: translateY(1px) scale(0.99); }
.btn--primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 30px -6px rgba(99, 102, 241, 0.55), 0 2px 10px -2px rgba(56, 189, 248, 0.4);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -6px rgba(99, 102, 241, 0.7), 0 4px 16px -2px rgba(56, 189, 248, 0.5); }
.btn--ghost {
  background: var(--glass-bg);
  border-color: var(--glass-border);
  color: var(--ink);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.btn--ghost:hover { background: var(--glass-bg2); border-color: var(--glass-hi); transform: translateY(-2px); }
.btn--block { width: 100%; }
.btn--sm { padding: 9px 16px; font-size: 14px; border-radius: 11px; }
.btn[disabled] { opacity: 0.5; pointer-events: none; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px max(20px, calc((100% - 1120px) / 2));
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(7, 10, 18, 0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--glass-border);
}
.nav__brand { display: flex; align-items: center; gap: 11px; }
.nav__logo { border-radius: 10px; }
.nav__name { font-weight: 700; font-size: 15px; letter-spacing: 0.02em; }
.nav__links { display: flex; gap: 26px; }
.nav__links a {
  color: var(--muted);
  font-size: 14.5px;
  position: relative;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--ink); }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -5px;
  width: 0; height: 2px;
  background: var(--grad);
  border-radius: 2px;
  transition: width 0.25s;
}
.nav__links a:hover::after { width: 100%; }
.nav__links a.is-active { color: var(--ink); }
.nav__links a.is-active::after { width: 100%; }
.nav__burger {
  display: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--ink);
}
.nav__burger svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }

.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(5, 7, 13, 0.92);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.menu-overlay.open { opacity: 1; visibility: visible; }
.menu-overlay a { font-size: 26px; font-weight: 600; padding: 8px 20px; color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 120px 0 60px;
  position: relative;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -3;
  overflow: hidden;
}
.hero__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.18;
  transform: scale(1.06);
  filter: blur(7px) saturate(0.7) brightness(0.65);
}
.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5,7,13,0.72) 0%, rgba(5,7,13,0.85) 55%, var(--bg0) 100%),
    radial-gradient(80% 60% at 50% 40%, transparent 0%, rgba(5,7,13,0.62) 100%);
}
.hero__overline {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--muted);
  display: block;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 22px 0 14px;
  padding: 7px 14px;
  font-size: 13px;
  color: #a5f3fc;
  background: rgba(56, 189, 248, 0.09);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 999px;
}
.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.hero__title {
  font-size: clamp(44px, 8.5vw, 80px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.06;
}
.hero__sub { margin-top: 16px; font-size: clamp(17px, 2.4vw, 22px); color: var(--ink); font-weight: 500; }
.hero__desc { margin-top: 14px; max-width: 620px; color: var(--muted); font-size: 16px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero__scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted2);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  animation: bob 2.4s ease-in-out infinite;
}
.hero__scroll svg { transform: rotate(90deg); fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
@keyframes bob { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- 数据统计 ---------- */
.stats { display: flex; gap: 40px; margin-top: 52px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat b, .stat .count {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.stat span { color: var(--muted2); font-size: 13px; letter-spacing: 0.06em; }
.stat .stat__unit { font-size: 16px; }

/* 统计条（子页横幅） */
.statband {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--glass-border);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 40px;
}
.statband__item {
  background: rgba(10, 15, 28, 0.6);
  padding: 26px 22px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.statband__item .num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.statband__item .lbl { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s, box-shadow 0.3s;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 80% at 20% 0%, rgba(255, 255, 255, 0.06), transparent 55%);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow: 0 20px 50px -20px rgba(56, 189, 248, 0.28);
}
.card__icon {
  width: 48px; height: 48px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.16), rgba(139, 92, 246, 0.16));
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 18px;
}
.card__icon svg { width: 24px; height: 24px; fill: none; stroke: var(--cyan); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card--num { padding-top: 22px; }
.card__num {
  position: absolute;
  top: 18px; right: 20px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.05);
  line-height: 1;
}

/* 可点击卡片 */
.card--link { text-decoration: none; display: block; }
.card__foot { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; color: var(--cyan); font-size: 14px; }
.card__foot svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- 玻璃面板 ---------- */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

/* ---------- 图文分栏 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split__img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: 0 30px 80px -30px rgba(56, 189, 248, 0.4);
  position: relative;
}
.split__img img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.split__img .split__cap {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 30px 20px 14px;
  font-size: 13px;
  color: rgba(255,255,255,0.9);
  background: linear-gradient(transparent, rgba(5,7,13,0.85));
}
.split__body h3 { font-size: 24px; font-weight: 700; margin-bottom: 14px; }
.split__body p { color: var(--muted); font-size: 15.5px; margin-bottom: 12px; }
.split--reverse .split__img { order: 2; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding-left: 26px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--cyan), var(--violet));
  opacity: 0.5;
}
.timeline__item { position: relative; padding: 0 0 30px 22px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -24px; top: 5px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg0);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 12px rgba(56,189,248,0.6);
}
.timeline__step {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}
.timeline__item h4 { font-size: 17px; font-weight: 700; margin: 4px 0 6px; }
.timeline__item p { color: var(--muted); font-size: 14.5px; }

/* ---------- 照片墙 ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery__item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  aspect-ratio: 4/3;
}
.gallery__item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.16,1,0.3,1), filter 0.6s; }
.gallery__item:hover img { transform: scale(1.08); }
.gallery__item .gallery__cap {
  position: absolute;
  inset: auto 0 0 0;
  padding: 30px 16px 12px;
  font-size: 13.5px;
  color: #fff;
  background: linear-gradient(transparent, rgba(5,7,13,0.9));
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s, transform 0.4s;
}
.gallery__item:hover .gallery__cap { opacity: 1; transform: none; }
.gallery__item--wide { grid-column: span 2; }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; display: grid; gap: 12px; }
.faq__item {
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  background: var(--glass-bg);
  overflow: hidden;
}
.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  background: none;
  border: none;
  color: var(--ink);
  font-size: 15.5px;
  font-weight: 600;
  text-align: left;
}
.faq__q .plus { flex: none; width: 22px; height: 22px; position: relative; }
.faq__q .plus::before, .faq__q .plus::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.3s;
}
.faq__q .plus::before { left: 3px; right: 3px; top: 50%; height: 2px; margin-top: -1px; }
.faq__q .plus::after { top: 3px; bottom: 3px; left: 50%; width: 2px; margin-left: -1px; }
.faq__item.open .plus::after { transform: rotate(90deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.16,1,0.3,1); }
.faq__a p { padding: 0 20px 18px; color: var(--muted); font-size: 14.5px; }
.faq__item.open .faq__a { max-height: 260px; }

/* ---------- 标签 ---------- */
.pills { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.pill--accent { color: #a5f3fc; border-color: rgba(56,189,248,0.3); background: rgba(56,189,248,0.08); }

/* ---------- 组织架构 ---------- */
.org { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.org__top {
  padding: 14px 30px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(56,189,248,0.14), rgba(139,92,246,0.14));
  border: 1px solid var(--glass-hi);
  font-weight: 700;
  text-align: center;
}
.org__mid { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.org__line { width: 2px; height: 18px; background: var(--glass-hi); }
.org__dept {
  padding: 12px 26px;
  border-radius: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-weight: 600;
}
.org__group { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; width: 100%; max-width: 720px; }
.org__group .org__cell {
  padding: 14px;
  border-radius: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  text-align: center;
  font-size: 14px;
}
.org__group .org__cell b { display: block; font-size: 15px; }
.org__group .org__cell span { color: var(--muted2); font-size: 12.5px; }

/* ---------- 抽奖区 ---------- */
.lottery { display: grid; grid-template-columns: 1fr 1.1fr; gap: 24px; align-items: stretch; }
.lottery__panel { padding: 30px; }
.lottery__stage { padding: 30px; display: flex; flex-direction: column; }

.lottery__status {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 16px;
  border-radius: 13px;
  font-size: 14.5px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
}
.lottery__status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted2); flex: none; }
.lottery__status[data-state="open"] .lottery__status-dot { background: var(--green); box-shadow: 0 0 8px var(--green); }
.lottery__status[data-state="open"] { color: #a7f3d0; }
.lottery__status[data-state="not_open"] .lottery__status-dot { background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.lottery__status[data-state="closed"] { color: var(--muted); }

.countdown { margin-top: 18px; text-align: center; padding: 18px; border-radius: 16px; background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border); }
.countdown__label { font-size: 13px; color: var(--muted); }
.countdown__time {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 4px;
}

.prize {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 22px;
  padding: 20px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(56,189,248,0.08), rgba(139,92,246,0.08));
  border: 1px solid rgba(255,255,255,0.08);
}
.prize__emoji { font-size: 46px; line-height: 1; }
.prize__name { font-size: 21px; font-weight: 700; }
.prize__meta { color: var(--muted); font-size: 14px; margin-top: 3px; }
.prize__meta b { color: var(--ink); font-family: var(--font-mono); }

.participants { margin-top: 18px; display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.participants b { color: var(--ink); font-family: var(--font-mono); font-size: 16px; }
.participants__live { display: inline-flex; align-items: center; gap: 6px; color: var(--muted2); font-size: 12px; }

.reg { margin-top: 22px; display: grid; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; color: var(--muted); letter-spacing: 0.03em; }
.field input {
  height: 48px;
  padding: 0 15px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font-size: 15px;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}
.field input::placeholder { color: var(--muted2); }
.field input:focus { outline: none; border-color: rgba(56, 189, 248, 0.6); background: rgba(255, 255, 255, 0.06); box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15); }
.reg__msg { font-size: 13.5px; min-height: 20px; }
.reg__msg.ok { color: var(--green); }
.reg__msg.err { color: #f87171; }
.lottery__tip { margin-top: 8px; font-size: 13px; color: var(--muted2); text-align: center; }

.stage {
  flex: 1;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  border-radius: 18px;
  background:
    radial-gradient(80% 70% at 50% 40%, rgba(99, 102, 241, 0.12), transparent 70%),
    rgba(255, 255, 255, 0.02);
  border: 1px solid var(--glass-border);
  padding: 24px;
  overflow: hidden;
}
.stage__ring {
  width: 92px; height: 92px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 42px;
  background: linear-gradient(135deg, rgba(56,189,248,0.14), rgba(139,92,246,0.14));
  border: 1px solid var(--glass-hi);
  box-shadow: inset 0 0 30px rgba(99,102,241,0.15);
  animation: float 3.4s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.stage__idle p { margin-top: 18px; font-size: 17px; font-weight: 600; }
.stage__sub { color: var(--muted2); font-size: 13.5px; font-weight: 400; margin-top: 4px; }

.stage__roll-name {
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stage__roll-sub { margin-top: 14px; color: var(--muted); font-size: 14px; letter-spacing: 0.2em; }
.stage.rolling .stage__roll-name { animation: rollblur 0.1s linear infinite; }
@keyframes rollblur { 0% { filter: blur(1.5px); transform: scale(1.02); } 50% { filter: blur(0px); transform: scale(0.99); } 100% { filter: blur(1.5px); transform: scale(1.02); } }

.stage__result { width: 100%; }
.stage__result-head { font-size: 15px; color: var(--muted); letter-spacing: 0.2em; margin-bottom: 16px; }
.stage__result-head b { color: var(--amber); }
.stage__winner {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 26px;
  margin: 6px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(251,191,36,0.12), rgba(251,146,60,0.1));
  border: 1px solid rgba(251, 191, 36, 0.35);
  animation: winIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.stage__winner .name { font-size: 22px; font-weight: 700; }
.stage__winner .cls { font-size: 13px; color: var(--muted); font-family: var(--font-mono); }
@keyframes winIn { from { opacity: 0; transform: translateY(16px) scale(0.9); } to { opacity: 1; transform: none; } }

.winners { margin-top: 22px; }
.winners__head { display: flex; align-items: center; justify-content: space-between; font-size: 15px; font-weight: 700; margin-bottom: 12px; }
.winners__round { font-size: 12px; color: var(--muted2); font-weight: 400; }
.winners__list { display: grid; gap: 10px; }
.winner-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: 14px; background: var(--glass-bg); border: 1px solid var(--glass-border); }
.winner-item .emoji { font-size: 22px; }
.winner-item .meta { flex: 1; }
.winner-item .meta .nm { font-weight: 600; }
.winner-item .meta .cl { font-size: 12.5px; color: var(--muted2); font-family: var(--font-mono); }
.winner-item .tag { font-size: 11.5px; color: var(--amber); background: rgba(251,191,36,0.1); padding: 3px 9px; border-radius: 999px; }
.winners__empty { color: var(--muted2); font-size: 13.5px; text-align: center; padding: 18px 0; }

/* ---------- 加入我们 ---------- */
.join { display: flex; gap: 48px; align-items: center; justify-content: center; flex-wrap: wrap; }
.join__qrcard {
  padding: 22px;
  border-radius: 26px;
  background: #fff;
  box-shadow: 0 30px 80px -20px rgba(56, 189, 248, 0.35), 0 0 0 1px rgba(255,255,255,0.06);
  text-align: center;
}
.join__qrcard img { border-radius: 8px; }
.join__qrcard-name { margin-top: 14px; color: #1e293b; font-size: 14.5px; font-weight: 600; }
.join__info { max-width: 420px; }
.join__info h3 { font-size: 26px; font-weight: 700; }
.join__info > p { color: var(--muted); margin-top: 12px; font-size: 15.5px; }
.join__group { display: flex; align-items: center; gap: 12px; margin-top: 26px; padding: 16px 18px; border-radius: 16px; background: var(--glass-bg); border: 1px solid var(--glass-border); }
.join__group-label { font-size: 13px; color: var(--muted2); }
.join__group-no { font-family: var(--font-mono); font-size: 22px; font-weight: 700; letter-spacing: 0.04em; }
.join__group .btn { margin-left: auto; }
.join__link { display: inline-flex; align-items: center; gap: 6px; margin-top: 18px; color: var(--cyan); font-size: 14.5px; }
.join__link svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.join__link:hover { text-decoration: underline; }

/* ---------- 小游戏 ---------- */
.game-wrap { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.game-card {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--glass-hi);
  box-shadow: 0 30px 80px -30px rgba(56,189,248,0.4);
}
.game-card canvas { display: block; width: 100%; height: auto; aspect-ratio: 3/4; }
.game-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5,7,13,0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
  cursor: pointer;
}
.game-overlay.show { opacity: 1; visibility: visible; }
.game-overlay__inner { text-align: center; padding: 30px; }
.game-overlay__emoji { font-size: 56px; }
.game-overlay__inner h3 { font-size: 24px; font-weight: 800; margin-top: 10px; }
.game-overlay__inner p { color: var(--muted); font-size: 14.5px; margin-top: 8px; }
.game-overlay__inner p b { color: var(--amber); font-family: var(--font-mono); }
.game-modal {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(5, 7, 13, 0.62);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.game-modal.show { opacity: 1; visibility: visible; }
.game-modal__card {
  position: relative;
  width: min(340px, 100%);
  padding: 26px 24px 24px;
  border-radius: 20px;
  background: rgba(15, 20, 32, 0.96);
  border: 1px solid var(--glass-hi);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.6);
  text-align: center;
}
.game-modal__x {
  position: absolute;
  top: 12px; right: 12px;
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-size: 15px;
  line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: color 0.2s, background 0.2s;
}
.game-modal__x:hover { color: #fff; background: rgba(255, 255, 255, 0.14); }
.game-modal__emoji { font-size: 42px; }
.game-modal__title { font-size: 22px; font-weight: 800; margin-top: 8px; }
.game-modal__score { color: var(--muted); font-size: 14px; margin-top: 6px; }
.game-modal__score b { color: var(--amber); font-family: var(--font-mono); }
.game-modal__text { color: #a5f3fc; font-size: 14px; margin: 14px 0 18px; }
.game-modal__btns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ---------- 宣传片视频 ---------- */
.video-frame {
  max-width: 860px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-hi);
  box-shadow: 0 30px 80px -30px rgba(56, 189, 248, 0.4);
  background: #000;
}
.video-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}
.video-credit {
  padding: 12px 18px;
  font-size: 12.5px;
  color: var(--muted2);
  text-align: center;
  background: rgba(255, 255, 255, 0.03);
  border-top: 1px solid var(--glass-border);
}
.video-credit a { color: var(--cyan); }
.video-credit a:hover { text-decoration: underline; }

.game-side { display: grid; gap: 16px; }
.game-stat {
  padding: 22px;
  border-radius: var(--radius);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  text-align: center;
}
.game-stat__label { display: block; color: var(--muted); font-size: 13px; letter-spacing: 0.08em; }
.game-stat__val {
  display: block;
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 6px;
}
.game-help { padding: 22px; border-radius: var(--radius); background: var(--glass-bg); border: 1px solid var(--glass-border); }
.game-help__title { font-weight: 700; font-size: 15px; margin-bottom: 12px; }
.game-help li { color: var(--muted); font-size: 13.5px; padding: 5px 0; }
.game-help kbd {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--glass-hi);
}

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--glass-border); padding: 40px 0 32px; background: rgba(0, 0, 0, 0.2); }
.footer__inner { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.footer__brand { display: flex; align-items: center; gap: 12px; }
.footer__brand img { border-radius: 8px; }
.footer__brand > div > div:first-child { font-weight: 700; font-size: 15px; }
.footer__college { color: var(--muted2); font-size: 13px; }
.footer__motto { color: var(--muted); font-size: 14px; margin-left: auto; }
.footer__admin { color: var(--muted2); font-size: 13px; transition: color 0.2s; }
.footer__admin:hover { color: var(--ink); }
.footer__copy { text-align: center; color: var(--muted2); font-size: 12.5px; margin-top: 26px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translate(-50%, 20px);
  z-index: 100;
  padding: 12px 22px;
  border-radius: 14px;
  background: rgba(15, 20, 32, 0.92);
  border: 1px solid var(--glass-hi);
  box-shadow: 0 10px 40px -10px rgba(0,0,0,0.6);
  color: var(--ink);
  font-size: 14px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.toast.show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.in { opacity: 1; transform: none; }
.reveal-left { opacity: 0; transform: translateX(-36px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-left.in { opacity: 1; transform: none; }
.reveal-right { opacity: 0; transform: translateX(36px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-right.in { opacity: 1; transform: none; }
.reveal-scale { opacity: 0; transform: scale(0.9); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-scale.in { opacity: 1; transform: none; }

/* 页面淡入 */
.page-enter { animation: pageIn 0.5s ease both; }
@keyframes pageIn { from { opacity: 0; } to { opacity: 1; } }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .lottery { grid-template-columns: 1fr; }
  .game-wrap { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .split--reverse .split__img { order: 0; }
  .statband { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .footer__motto { margin-left: 0; width: 100%; order: 3; }
}

@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .grid--3, .grid--4, .grid--2 { grid-template-columns: 1fr; }
  .section { padding: 68px 0; }
  .page { padding-top: 120px; }
  .stats { gap: 26px; }
  .join { gap: 32px; }
  .lottery__panel, .lottery__stage { padding: 20px; }
  .stage { min-height: 240px; }
  .join__qrcard img { width: 210px; height: 210px; }
  .statband { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .gallery__item--wide { grid-column: span 1; }
  .org__group { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}