/* =================================================================
   程新社 · 官网 — 设计系统 v2
   墨黑 / 纸白 / 酸性青柠 · Tech-Editorial · 玻璃拟态 · Bento
   参考：Rare UI（组件质感） + Apple（滚动叙事）
   ================================================================= */
:root {
  --ink: #0B0B0E;
  --ink-2: #131318;
  --ink-3: #1B1B22;
  --paper: #ECEAE3;
  --paper-dim: rgba(236, 234, 227, .62);
  --paper-faint: rgba(236, 234, 227, .12);
  --accent: #C8F060;      /* 酸性青柠 — 主强调 */
  --hot: #FF5436;         /* 珊瑚橙 — 次强调 */
  --blue: #5AB2FF;        /* 冷调点缀 */
  --line: rgba(236, 234, 227, .14);
  --line-2: rgba(236, 234, 227, .08);

  --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', system-ui, sans-serif;

  --ease: cubic-bezier(.2, 0, 0, 1);
  --ease-out: cubic-bezier(0, 0, .2, 1);
  --ease-soft: cubic-bezier(.16, 1, .3, 1);

  --maxw: 1240px;
  --gut: clamp(20px, 5vw, 72px);
  --radius: 22px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  cursor: none;
}
@media (hover: none) { body { cursor: auto; } }
a { color: inherit; text-decoration: none; }
em { font-style: normal; color: var(--accent); }
code { font-family: 'Space Grotesk', monospace; color: var(--accent); }
::selection { background: var(--accent); color: var(--ink); }

/* 噪点颗粒 */
.grain {
  position: fixed; inset: 0; z-index: 9998; pointer-events: none;
  opacity: .05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* 自定义光标 */
.cursor {
  position: fixed; top: 0; left: 0; z-index: 9999; pointer-events: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); mix-blend-mode: difference;
  transform: translate(-50%, -50%); transition: width .25s var(--ease), height .25s var(--ease), background .25s;
}
.cursor.is-hover { width: 46px; height: 46px; background: var(--paper); }
@media (hover: none) { .cursor { display: none; } }

/* 滚动进度条（Apple 风） */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0; z-index: 1000;
  background: linear-gradient(90deg, var(--accent), var(--hot));
  box-shadow: 0 0 12px rgba(200, 240, 96, .6);
}

/* 加载仪式 */
.loader {
  position: fixed; inset: 0; z-index: 10000; background: var(--ink);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 28px;
  transition: opacity .7s var(--ease), visibility .7s;
}
.loader.done { opacity: 0; visibility: hidden; }
.loader__inner { display: flex; gap: 6px; }
.loader__word {
  font-family: var(--font-display); font-size: clamp(40px, 9vw, 90px); font-weight: 700; color: var(--paper);
  display: inline-block; animation: pop .9s var(--ease) both;
}
.loader__word:nth-child(2) { animation-delay: .12s; }
.loader__word:nth-child(3) { animation-delay: .24s; color: var(--accent); }
@keyframes pop { 0% { opacity: 0; transform: translateY(30px) scale(.8); } 100% { opacity: 1; transform: none; } }
.loader__bar { width: min(260px, 60vw); height: 2px; background: var(--paper-faint); overflow: hidden; border-radius: 2px; }
.loader__bar i { display: block; height: 100%; width: 0; background: var(--accent); }

/* 导航（Apple 半透明 → Rare UI 浮动药丸） */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 900; padding: 18px var(--gut); pointer-events: none; }
.nav__inner {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  pointer-events: auto; border-radius: 999px; padding: 0; border: 1px solid transparent;
  transition: background .4s var(--ease), border-color .4s, box-shadow .4s, padding .4s, max-width .4s, margin .4s;
}
.nav.scrolled .nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 18px;
  background: rgba(11, 11, 14, .55); backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-color: var(--line); box-shadow: 0 14px 44px rgba(0, 0, 0, .45);
}
.nav__logo { font-family: var(--font-display); font-weight: 700; font-size: 22px; letter-spacing: -.02em; display: flex; align-items: center; gap: 2px; }
.nav__logo span { color: var(--accent); }
.nav__links { display: flex; gap: 30px; }
.nav__links a { font-size: 15px; color: var(--paper-dim); transition: color .2s; position: relative; }
.nav__links a:hover { color: var(--paper); }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -4px; width: 0; height: 1px; background: var(--accent); transition: width .3s var(--ease); }
.nav__links a:hover::after { width: 100%; }
.nav__right { display: flex; align-items: center; gap: 16px; }
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: none; padding: 6px; }
.nav__burger span { width: 26px; height: 2px; background: var(--paper); transition: .3s var(--ease); }

/* 移动菜单 */
.menu {
  position: fixed; inset: 0; z-index: 850; background: rgba(11, 11, 14, .92); backdrop-filter: blur(20px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px;
  transform: translateY(-100%); transition: transform .5s var(--ease);
}
.menu.open { transform: none; }
.menu a { font-family: var(--font-display); font-size: clamp(28px, 8vw, 48px); font-weight: 600; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 15px; letter-spacing: -.01em;
  padding: 13px 24px; border-radius: 999px; border: 1px solid transparent; cursor: none;
  transition: transform .25s var(--ease), background .25s, color .25s, border-color .25s, box-shadow .25s;
}
.btn--solid { background: var(--accent); color: var(--ink); box-shadow: 0 8px 24px rgba(200, 240, 96, .25); }
.btn--solid:hover { transform: translateY(-2px); filter: brightness(1.06); box-shadow: 0 12px 34px rgba(200, 240, 96, .35); }
.btn--ghost { border-color: var(--line); color: var(--paper); background: rgba(236, 234, 227, .03); }
.btn--ghost:hover { border-color: var(--paper); transform: translateY(-2px); background: rgba(236, 234, 227, .07); }
.btn--lg { padding: 16px 32px; font-size: 16px; }
.btn--xl { padding: 20px 46px; font-size: 19px; }
.btn:active { transform: scale(.97); }

/* HERO */
.hero { position: relative; min-height: 100vh; max-width: 100%; margin: 0; padding: 150px var(--gut) 0; display: flex; flex-direction: column; justify-content: center; overflow: hidden; }
.hero__aurora {
  position: absolute; inset: -25% -15% auto -15%; height: 90%; z-index: 0; pointer-events: none;
  filter: blur(70px); opacity: .6;
  background:
    radial-gradient(38% 48% at 28% 32%, rgba(200, 240, 96, .40), transparent 68%),
    radial-gradient(34% 44% at 76% 38%, rgba(255, 84, 54, .24), transparent 68%),
    radial-gradient(40% 42% at 54% 72%, rgba(90, 178, 255, .20), transparent 70%);
  animation: aurora 16s ease-in-out infinite alternate;
}
@keyframes aurora { 0% { transform: translate3d(0, 0, 0) scale(1); } 100% { transform: translate3d(3%, -4%, 0) scale(1.1); } }
.hero > * { position: relative; z-index: 1; }
.hero__inner { will-change: transform, opacity; }
.hero__meta { display: flex; align-items: center; gap: 14px; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--paper-dim); margin-bottom: 26px; }
.hero__meta i { width: 4px; height: 4px; border-radius: 50%; background: var(--accent); }
.hero__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(52px, 13vw, 168px); line-height: .9; letter-spacing: -.04em; }
.hero__title .line { display: block; }
.hero__title em { color: var(--accent); }
.hero__foot { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 40px; margin-top: 48px; }
.hero__sub { max-width: 520px; color: var(--paper-dim); font-size: clamp(15px, 1.6vw, 18px); }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.scrollcue { position: absolute; left: var(--gut); bottom: 96px; display: flex; align-items: center; gap: 12px; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--paper-dim); z-index: 1; }
.scrollcue i { width: 1px; height: 34px; background: linear-gradient(var(--accent), transparent); animation: cue 1.8s var(--ease) infinite; }
@keyframes cue { 0% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } 51% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* 跑马灯 */
.marquee { position: absolute; left: 0; right: 0; bottom: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; padding: 14px 0; background: rgba(19, 19, 24, .6); backdrop-filter: blur(8px); z-index: 1; }
.marquee__track { display: flex; align-items: center; gap: 28px; white-space: nowrap; width: max-content; animation: scroll 22s linear infinite; }
.marquee__track span { font-family: var(--font-display); font-size: 18px; font-weight: 500; text-transform: uppercase; letter-spacing: .02em; }
.marquee__track i { color: var(--accent); }
@keyframes scroll { to { transform: translateX(-50%); } }

/* 通用 section */
section { padding: clamp(72px, 11vw, 150px) var(--gut); max-width: var(--maxw); margin: 0 auto; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 12px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; margin-bottom: 20px;
  background: rgba(200, 240, 96, .06);
}
.sec-eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.sec-head { display: flex; flex-direction: column; gap: 4px; margin-bottom: clamp(36px, 5vw, 64px); }
.sec-no { font-family: var(--font-display); font-size: 14px; color: var(--accent); letter-spacing: .1em; }
.sec-title { font-family: var(--font-display); font-weight: 700; font-size: clamp(30px, 5vw, 64px); letter-spacing: -.03em; line-height: 1.04; }

/* 关于 */
.about__grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(30px, 6vw, 80px); align-items: start; }
.about__lead { font-family: var(--font-display); font-weight: 500; font-size: clamp(24px, 3.4vw, 44px); line-height: 1.22; letter-spacing: -.02em; }
.about__lead em { color: var(--accent); }
.about__body p { color: var(--paper-dim); font-size: clamp(15px, 1.6vw, 18px); margin-bottom: 18px; }

/* 方向 — Bento 网格（Rare UI 质感） */
.tracks__grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(172px, auto); gap: 16px; }
.track {
  position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; background: linear-gradient(160deg, rgba(27, 27, 34, .7), rgba(19, 19, 24, .7));
  backdrop-filter: blur(8px); transition: transform .4s var(--ease-soft), border-color .4s, box-shadow .4s;
  display: flex; flex-direction: column;
}
.track::before { content: ""; position: absolute; inset: 0; background: radial-gradient(120% 120% at 100% 0%, rgba(200, 240, 96, .14), transparent 60%); opacity: 0; transition: opacity .4s; }
.track:hover { transform: translateY(-6px); border-color: rgba(200, 240, 96, .5); box-shadow: 0 24px 60px rgba(0, 0, 0, .45), 0 0 0 1px rgba(200, 240, 96, .25); }
.track:hover::before { opacity: 1; }
.track--big { grid-column: span 2; grid-row: span 2; padding: 36px; }
.track--wide { grid-column: span 2; }
.track--full { grid-column: span 4; }
.track__icon { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: rgba(200, 240, 96, .1); border: 1px solid rgba(200, 240, 96, .25); margin-bottom: 18px; }
.track__icon svg { width: 24px; height: 24px; stroke: var(--accent); fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.track--big .track__icon { width: 56px; height: 56px; }
.track--big .track__icon svg { width: 30px; height: 30px; }
.track__no { font-family: var(--font-display); font-size: 13px; color: var(--paper-dim); letter-spacing: .1em; }
.track h3 { font-family: var(--font-display); font-size: clamp(22px, 2.6vw, 30px); font-weight: 600; margin: 12px 0 10px; letter-spacing: -.02em; }
.track--big h3 { font-size: clamp(28px, 3.6vw, 44px); }
.track p { color: var(--paper-dim); font-size: 15px; margin-top: auto; }
.track__tag { display: inline-flex; align-self: flex-start; margin-top: 16px; font-size: 12px; letter-spacing: .04em; color: var(--paper); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; }

/* 成员 */
.members__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.member {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px;
  background: linear-gradient(160deg, rgba(27, 27, 34, .6), rgba(19, 19, 24, .6)); backdrop-filter: blur(8px);
  transition: transform .4s var(--ease-soft), border-color .4s, box-shadow .4s;
}
.member:hover { transform: translateY(-8px); border-color: rgba(200, 240, 96, .5); box-shadow: 0 24px 60px rgba(0, 0, 0, .45), 0 0 0 1px rgba(200, 240, 96, .22); }
.member__avatar { width: 64px; height: 64px; border-radius: 16px; background: linear-gradient(135deg, var(--accent), #7fae2e); display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-weight: 700; font-size: 28px; color: var(--ink); margin-bottom: 18px; box-shadow: 0 8px 24px rgba(200, 240, 96, .25); }
.member__avatar::after { content: attr(data-initial); }
.member h3 { font-family: var(--font-display); font-size: 20px; font-weight: 600; }
.member__role { display: block; color: var(--accent); font-size: 13px; margin: 4px 0 10px; }
.member p { color: var(--paper-dim); font-size: 14px; }

/* 数据 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { padding: 40px 0; position: relative; }
.stat + .stat::before { content: ""; position: absolute; left: -9px; top: 30%; height: 40%; width: 1px; background: var(--line); }
.stat b { display: block; font-family: var(--font-display); font-weight: 700; font-size: clamp(40px, 6vw, 80px); letter-spacing: -.03em; line-height: 1; background: linear-gradient(180deg, var(--paper), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--paper-dim); font-size: 14px; letter-spacing: .04em; }

/* 活动 */
.activity__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.activity__card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 28px;
  background: linear-gradient(160deg, rgba(27, 27, 34, .6), rgba(19, 19, 24, .6)); backdrop-filter: blur(8px);
  transition: transform .4s var(--ease-soft), border-color .4s, box-shadow .4s;
}
.activity__card:hover { transform: translateY(-6px); border-color: rgba(200, 240, 96, .45); box-shadow: 0 22px 54px rgba(0, 0, 0, .4); }
.activity__k { display: block; font-family: var(--font-display); font-size: 13px; letter-spacing: .1em; color: var(--accent); margin-bottom: 12px; text-transform: uppercase; }
.activity__card p { font-size: clamp(17px, 2vw, 22px); font-family: var(--font-display); font-weight: 500; }

/* FAQ */
.faq__list { border-top: 1px solid var(--line); }
.faq__item { border-bottom: 1px solid var(--line); }
.faq__q { width: 100%; text-align: left; background: none; border: 0; color: var(--paper); cursor: none; font-family: var(--font-display); font-size: clamp(18px, 2.4vw, 26px); font-weight: 500; padding: 26px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; transition: color .2s; }
.faq__q:hover { color: var(--accent); }
.faq__q i { width: 18px; height: 18px; position: relative; flex: none; transition: transform .3s var(--ease); }
.faq__q i::before, .faq__q i::after { content: ""; position: absolute; background: var(--accent); }
.faq__q i::before { top: 8px; left: 0; width: 18px; height: 2px; }
.faq__q i::after { left: 8px; top: 0; width: 2px; height: 18px; transition: opacity .3s; }
.faq__item.open .faq__q i::after { opacity: 0; }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .4s var(--ease); }
.faq__a p { color: var(--paper-dim); padding-bottom: 26px; max-width: 640px; }

/* CTA — 玻璃面板（Apple / Rare UI） */
.cta__panel {
  position: relative; max-width: var(--maxw); margin: 0 auto; overflow: hidden;
  border-radius: 30px; padding: clamp(44px, 7vw, 96px); text-align: center;
  background: linear-gradient(180deg, rgba(27, 27, 34, .75), rgba(11, 11, 14, .75));
  border: 1px solid var(--line); backdrop-filter: blur(12px);
}
.cta__panel::before { content: ""; position: absolute; inset: 0; background: radial-gradient(60% 90% at 50% 0%, rgba(200, 240, 96, .18), transparent 70%); pointer-events: none; }
.cta__title { position: relative; font-family: var(--font-display); font-weight: 700; font-size: clamp(34px, 6.5vw, 92px); letter-spacing: -.03em; line-height: 1.02; margin-bottom: 38px; }
.cta__title em { color: var(--accent); }
.cta__panel .btn { position: relative; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); padding: clamp(56px, 8vw, 100px) var(--gut) 40px; }
.footer__top { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 1.4fr 2fr; gap: 40px; }
.footer__logo { font-family: var(--font-display); font-weight: 700; font-size: 30px; }
.footer__logo span { color: var(--accent); }
.footer__brand p { color: var(--paper-dim); margin-top: 10px; max-width: 320px; }
.footer__cols { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.footer__cols h4 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.footer__cols a { display: block; color: var(--paper-dim); padding: 5px 0; transition: color .2s; }
.footer__cols a:hover { color: var(--paper); }
.footer__bottom { max-width: var(--maxw); margin: 50px auto 0; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--paper-dim); font-size: 13px; border-top: 1px solid var(--line); padding-top: 24px; }

/* 滚动揭示（Apple 模糊入场） */
.reveal { opacity: 0; transform: translateY(30px); filter: blur(8px); transition: opacity .9s var(--ease-soft) var(--d, 0s), transform .9s var(--ease-soft) var(--d, 0s), filter .9s var(--ease-soft) var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; filter: none; }

/* 终端打字机 */
.terminal { display: flex; justify-content: center; }
.terminal__win { width: min(720px, 100%); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: rgba(19, 19, 24, .8); backdrop-filter: blur(8px); }
.terminal__bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.terminal__bar i { width: 11px; height: 11px; border-radius: 50%; background: rgba(236, 234, 227, .25); }
.terminal__bar i:nth-child(1) { background: #FF5F56; }
.terminal__bar i:nth-child(2) { background: #FFBD2E; }
.terminal__bar i:nth-child(3) { background: #27C93F; }
.terminal__bar span { margin-left: 10px; font-size: 12px; color: var(--paper-dim); font-family: var(--font-display); letter-spacing: .04em; }
.terminal__body { padding: 24px 22px; font-family: 'Space Grotesk', ui-monospace, monospace; font-size: clamp(14px, 1.8vw, 18px); line-height: 1.7; min-height: 180px; }
.terminal__line { white-space: pre-wrap; }
.terminal__line:last-child::after { content: "▋"; color: var(--accent); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* 响应式 */
@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .about__grid { grid-template-columns: 1fr; }
  .tracks__grid { grid-template-columns: 1fr; }
  .track--big, .track--wide, .track--full { grid-column: auto; grid-row: auto; }
  .members__grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .activity__grid { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr; }
  .stat + .stat::before { display: none; }
}
@media (max-width: 560px) {
  .members__grid { grid-template-columns: 1fr; }
  .hero__foot { flex-direction: column; align-items: flex-start; }
  .footer__cols { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; filter: none; transition: none; }
  .hero__aurora { animation: none; }
}