/* ==========================================================================
   AI Show 北京站 · 首页样式
   ========================================================================== */

:root {
  --bg: #0a0e27;
  --bg-alt: #060918;
  --bg-deep: #070a16;
  --card: #131a31;
  --card-2: #172039;
  --line: #232c46;
  --line-2: #2f3b5c;
  --accent: #58a6ff;
  --violet: #6c5ce7;
  --cyan: #00d2ff;
  --grad: linear-gradient(135deg, #6c5ce7, #00d2ff);
  --text: #e8eef7;
  --text-2: #9aa7bf;
  --text-3: #6b7893;
  --radius: 14px;
  --nav-h: 72px;
  --max: 1200px;
  --ease: cubic-bezier(.22, .68, .28, 1);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  caret-color: transparent;
}

input, textarea, [contenteditable="true"] { caret-color: auto; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
h1, h2, h3, h4, p, dl, dd { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

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

.ic { width: 22px; height: 22px; flex: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 24px;
  border-radius: 10px;
  border: 1px solid transparent;
  background-origin: border-box;
  background-repeat: no-repeat;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .2px;
  cursor: pointer;
  transition: transform .2s var(--ease), background .2s, border-color .2s, box-shadow .25s;
  white-space: nowrap;
}
.btn-lg { height: 52px; padding: 0 32px; font-size: 15px; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; border-radius: 8px; }

.btn-primary {
  background: var(--grad);
  background-origin: border-box;
  background-repeat: no-repeat;
  color: #fff;
  box-shadow: 0 8px 24px rgba(95, 96, 235, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(95, 96, 235, .4); }

.btn-ghost {
  background: rgba(255, 255, 255, .04);
  border-color: rgba(255, 255, 255, .18);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(88, 166, 255, .12); border-color: rgba(88, 166, 255, .5); }

.center { text-align: center; margin-top: 40px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.nav.is-scrolled {
  background: rgba(7, 10, 22, .82);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .07);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .5px;
  box-shadow: 0 6px 18px rgba(95, 96, 235, .35);
  overflow: hidden;
  flex: none;
}
.brand-mark.has-img {
  border-radius: 50%;
  background: #033f9f;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .45), 0 0 0 1px rgba(255, 255, 255, .12) inset;
}
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; transform: scale(.86); }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 16px; font-weight: 700; letter-spacing: .2px; }
.brand-text em { font-style: normal; font-size: 11px; color: var(--text-3); letter-spacing: .3px; }

.nav-menu { display: flex; align-items: center; gap: 18px; margin-left: auto; margin-right: 4px; }
.nav-link { font-size: 14px; color: var(--text-2); transition: color .2s; position: relative; padding: 6px 0; white-space: nowrap; }
.nav-link:hover { color: var(--text); }
.nav-link::after {
  content: ""; position: absolute; left: 50%; bottom: 0; width: 0; height: 2px;
  background: var(--grad); border-radius: 2px; transform: translateX(-50%);
  transition: width .25s var(--ease);
}
.nav-link:hover::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: 10px; flex: none; }

.nav-burger {
  display: none;
  width: 42px; height: 42px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 10px;
  padding: 0;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-burger span { display: block; width: 18px; height: 1.5px; background: var(--text); transition: transform .25s, opacity .2s; }
.nav-burger.is-on span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger.is-on span:nth-child(2) { opacity: 0; }
.nav-burger.is-on span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-drawer {
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  background: #070b18;
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  overflow-y: auto;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.nav-drawer.is-open { opacity: 1; transform: none; pointer-events: auto; }
.nav-drawer-inner { display: flex; flex-direction: column; padding: 8px 24px 32px; }
.m-link { padding: 16px 0; border-bottom: 1px solid rgba(255, 255, 255, .06); font-size: 16px; color: var(--text-2); }
.m-link:last-of-type { border-bottom: none; }
.nav-drawer-cta { display: flex; gap: 12px; margin-top: 18px; }
.nav-drawer-cta .btn { flex: 1; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 700px;
  padding: calc(var(--nav-h) + 96px) 0 96px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: radial-gradient(120% 90% at 50% 0%, #122a52 0%, #0a1330 42%, #070b1c 100%);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 42%;
  opacity: .28;
  filter: saturate(.5) contrast(1.06) brightness(.78) blur(3.5px);
  transform: scale(1.06);
  mask-image: radial-gradient(80% 80% at 50% 40%, #000 24%, transparent 100%);
  -webkit-mask-image: radial-gradient(80% 80% at 50% 40%, #000 24%, transparent 100%);
}
.hero::before {
  content: "";
  position: absolute; inset: 0; z-index: 1;
  background-image:
    linear-gradient(rgba(88, 166, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 166, 255, .06) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(70% 60% at 50% 36%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 36%, #000 0%, transparent 78%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute; inset: 0; z-index: 2;
  background:
    radial-gradient(58% 52% at 50% 46%, rgba(7, 10, 22, .9) 0%, rgba(7, 10, 22, .55) 58%, rgba(7, 10, 22, .2) 100%),
    linear-gradient(180deg, rgba(7, 10, 22, .96) 0%, rgba(7, 10, 22, .42) 34%, rgba(7, 10, 22, .96) 100%);
  pointer-events: none;
}
.hero-glow {
  position: absolute; left: 50%; top: -16%; z-index: 3;
  width: 820px; height: 440px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(0, 210, 255, .2), transparent 72%);
  filter: blur(12px);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 4; text-align: center; }

.hero-eyebrow {
  display: block;
  color: #9db4d2;
  font-size: 13.5px;
  letter-spacing: 1.1px;
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(26px, 3.4vw, 46px);
  text-wrap: balance;
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: .3px;
  max-width: 1100px;
  margin: 0 auto;
  text-shadow: 0 2px 24px rgba(0, 0, 0, .45);
}
.hero-accent {
  display: block;
  margin-top: 6px;
  font-size: clamp(20px, 2.3vw, 30px);
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  margin: 26px auto 0;
  max-width: 760px;
  font-size: clamp(14.5px, 1.3vw, 17px);
  color: rgba(230, 238, 247, .72);
  line-height: 1.8;
}
.hero-actions { display: flex; justify-content: center; gap: 14px; margin-top: 34px; flex-wrap: wrap; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  max-width: 760px;
  margin: 56px auto 0;
  padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, .12);
}
.stat { text-align: center; padding: 0 8px; }
.stat + .stat { border-left: 1px solid rgba(255, 255, 255, .08); }
.stat-num {
  display: block;
  font-size: clamp(26px, 2.9vw, 38px);
  font-weight: 800;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.stat-label { display: block; margin-top: 8px; font-size: 13px; color: var(--text-3); letter-spacing: .5px; }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; background: var(--bg); position: relative; }
.section--alt { background: var(--bg-alt); }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.eyebrow {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.sec-title {
  font-size: clamp(23px, 2.6vw, 32px);
  text-wrap: balance;
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: .3px;
}
.sec-desc { margin-top: 14px; font-size: 15.5px; color: var(--text-2); }

/* ---------- 展会简介 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.06fr .94fr;
  gap: 64px;
  align-items: center;
}
.about-copy .sec-title { margin-bottom: 20px; }
.about-p { color: var(--text-2); font-size: 15px; line-height: 1.9; margin-bottom: 12px; }
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
.point {
  display: flex;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .022);
  transition: border-color .25s, background .25s;
}
.point:hover { border-color: rgba(88, 166, 255, .38); background: rgba(88, 166, 255, .05); }
.point-ic {
  width: 34px; height: 34px; flex: none;
  display: grid; place-items: center;
  border-radius: 9px;
  background: rgba(88, 166, 255, .1);
  color: var(--accent);
}
.point-ic .ic { width: 19px; height: 19px; }
.point b { display: block; font-size: 14.5px; font-weight: 600; margin-bottom: 3px; }
.point p { font-size: 12.5px; color: var(--text-3); line-height: 1.6; }

.about-media {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line-2);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .45);
}
.about-media img { width: 100%; aspect-ratio: 3 / 2.05; object-fit: cover; }
.about-media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(6, 9, 24, .55));
}

/* ---------- 同期论坛 ---------- */
.tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.tab {
  height: 40px;
  padding: 0 22px;
  border-radius: 100px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, .03);
  color: var(--text-2);
  font-size: 14.5px;
  cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
}
.tab:hover { color: var(--text); border-color: rgba(88, 166, 255, .45); }
.tab.is-on { background: rgba(88, 166, 255, .14); border-color: rgba(88, 166, 255, .55); color: #cfe4ff; }

.forum-panel { display: none; }
.forum-panel.is-on { display: grid; grid-template-columns: 1.08fr .92fr; gap: 44px; align-items: center; }
.forum-panel {
  background: linear-gradient(160deg, rgba(23, 32, 57, .9), rgba(13, 19, 38, .9));
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px;
}
.forum-copy h3 { text-wrap: balance; font-size: clamp(19px, 1.8vw, 24px); font-weight: 700; line-height: 1.4; margin-bottom: 14px; }
.forum-copy > p { color: var(--text-2); font-size: 14.5px; line-height: 1.85; }
.forum-meta { display: flex; flex-wrap: wrap; gap: 26px; margin: 24px 0; }
.forum-meta div { display: flex; align-items: baseline; gap: 8px; }
.forum-meta dt { font-size: 13px; color: var(--text-3); }
.forum-meta dd { font-size: 14px; color: var(--text); font-weight: 500; }
.forum-media { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
.forum-media img { width: 100%; aspect-ratio: 16 / 10.5; object-fit: cover; }

/* ---------- 展品范围 ---------- */
.scope-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.scope-card {
  flex: 0 0 calc((100% - 64px) / 5);
  padding: 28px 24px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(23, 32, 57, .75), rgba(13, 19, 38, .5));
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
  position: relative;
  overflow: hidden;
}
.scope-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--grad); opacity: 0; transition: opacity .3s;
}
.scope-card:hover { transform: translateY(-5px); border-color: rgba(88, 166, 255, .42); box-shadow: 0 18px 44px rgba(0, 0, 0, .35); }
.scope-card:hover::before { opacity: 1; }
.scope-ic {
  width: 48px; height: 48px; display: grid; place-items: center;
  border-radius: 12px; margin-bottom: 20px;
  background: rgba(88, 166, 255, .1);
  border: 1px solid rgba(88, 166, 255, .2);
  color: #8ec6ff;
}
.scope-ic .ic { width: 27px; height: 27px; }
.scope-img { border-radius: 10px; overflow: hidden; margin-bottom: 18px; }
.scope-img img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.scope-card h3 { font-size: 16.5px; font-weight: 600; margin-bottom: 10px; letter-spacing: .2px; }
.scope-card p { font-size: 13px; color: var(--text-3); line-height: 1.75; }

/* ---------- 合作品牌 ---------- */
.marquee-wrap { display: flex; flex-direction: column; gap: 14px; }
.marquee {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}
.marquee-track { display: flex; gap: 14px; width: max-content; will-change: transform; }
.marquee--l .marquee-track { animation: slide-l 70s linear infinite; }
.marquee--r .marquee-track { animation: slide-l 88s linear infinite reverse; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes slide-l { from { transform: translateX(0); } to { transform: translateX(-50%); } }

.logo-cell {
  width: 276px; height: 117px;
  flex: none;
  border-radius: 10px;
  background: #fff;
  display: flex; align-items: center; justify-content: center;
  padding: 12px 16px;
  overflow: hidden;
}
.logo-cell img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; mix-blend-mode: multiply; }

/* ---------- 展会亮点 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.why-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
}
.why-card:hover { transform: translateY(-5px); border-color: rgba(88, 166, 255, .4); box-shadow: 0 20px 48px rgba(0, 0, 0, .4); }
.why-img { overflow: hidden; }
.why-img img { width: 100%; aspect-ratio: 2.45 / 1; object-fit: cover; transition: transform .6s var(--ease); }
.why-card:hover .why-img img { transform: scale(1.05); }
.why-body { padding: 22px 22px 26px; }
.why-body h3 { text-wrap: balance; font-size: 17px; font-weight: 600; margin-bottom: 9px; }
.why-body p { font-size: 13.5px; color: var(--text-2); line-height: 1.8; }

/* ---------- 专业观众 ---------- */
.vis-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.vis-card {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .018);
  transition: border-color .3s, background .3s, transform .3s var(--ease);
}
.vis-card:hover { border-color: rgba(88, 166, 255, .38); background: rgba(88, 166, 255, .05); transform: translateY(-3px); }
.vis-ic {
  width: 44px; height: 44px; display: grid; place-items: center;
  border-radius: 11px; margin-bottom: 18px;
  background: rgba(88, 166, 255, .1);
  color: var(--accent);
}
.vis-ic .ic { width: 24px; height: 24px; }
.vis-card h3 { font-size: 16.5px; font-weight: 600; margin-bottom: 8px; }
.vis-card p { font-size: 13.5px; color: var(--text-3); line-height: 1.75; }

/* ---------- 合作媒体 ---------- */
.media-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.media-cell {
  flex: 0 0 calc((100% - 48px) / 4);
  aspect-ratio: 2.35 / 1;
  background: #fff;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  padding: 12px 16px;
  overflow: hidden;
}
.media-cell img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; mix-blend-mode: multiply; }

/* ---------- 收尾 CTA ---------- */
.cta-band {
  position: relative;
  padding: 96px 0;
  overflow: hidden;
  background: linear-gradient(150deg, #0c2450 0%, #0a1230 48%, #080c20 100%);
  border-top: 1px solid rgba(88, 166, 255, .14);
  border-bottom: 1px solid rgba(88, 166, 255, .1);
}
.cta-glow {
  position: absolute; left: 50%; top: 50%;
  width: 900px; height: 420px; transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, rgba(108, 92, 231, .3), transparent 70%);
  pointer-events: none;
}
.cta-inner { position: relative; text-align: center; }
.cta-inner h2 { font-size: clamp(26px, 3.2vw, 40px); font-weight: 800; letter-spacing: .5px; }
.cta-line { margin-top: 16px; font-size: 15.5px; color: rgba(232, 238, 247, .78); }
.cta-line--sub { margin-top: 4px; color: var(--text-3); font-size: 14px; }
.cta-actions { display: flex; justify-content: center; gap: 14px; margin-top: 34px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-deep); border-top: 1px solid rgba(255, 255, 255, .06); }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr .92fr 1.1fr;
  gap: 48px;
  padding: 60px 0 48px;
  align-items: start;
}
.footer-org { align-self: start; }
.footer-org h3 { font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 18px; letter-spacing: .2px; }
.footer-org img { width: 100%; height: auto; max-width: 300px; opacity: .95; }
.footer h3 { font-size: 16px; font-weight: 600; margin-bottom: 20px; letter-spacing: .3px; }

.ftabs { display: flex; gap: 6px; margin-bottom: 18px; flex-wrap: wrap; }
.ftab {
  padding: 7px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-3);
  font-size: 14px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.ftab:hover { color: var(--text); background: rgba(255, 255, 255, .05); }
.ftab.is-on { background: rgba(88, 166, 255, .16); color: #9ccbff; }

.fpanel { display: none; flex-direction: column; gap: 12px; }
.fpanel.is-on { display: flex; }
.frow { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--text-2); transition: color .2s; }
.frow:hover { color: var(--text); }
.frow-ic {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  border-radius: 8px;
  background: rgba(88, 166, 255, .12);
  color: var(--accent);
}
.frow-ic .ic { width: 16px; height: 16px; }

.qrs { display: flex; gap: 10px; flex-wrap: nowrap; }
.qr { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.qr-img {
  width: 120px; height: 120px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .12);
  background: #fff;
}
.qr-img img { width: 100%; height: 100%; object-fit: cover; }
.qr span { font-size: 11.5px; color: var(--text-3); }

.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .06); padding: 18px 0; }
.footer-bottom-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-bottom p { font-size: 12.5px; color: var(--text-3); }

/* ---------- 入场动画 ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-menu { display: none; }
  .nav-cta { display: none; }
  .nav-lang { display: none; }
  .nav-burger { display: flex; }
  .about-grid { gap: 40px; }
  .scope-card { flex: 0 0 calc((100% - 48px) / 4); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .vis-grid { grid-template-columns: repeat(2, 1fr); }

  .forum-panel { padding: 30px; gap: 30px; }
}

@media (max-width: 860px) {
  .section { padding: 68px 0; }
  .about-grid { grid-template-columns: 1fr; }
  .about-media { order: -1; }
  .forum-panel.is-on { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; padding: 48px 0 36px; }
  .footer-org { grid-column: 1 / -1; }
  .footer-org { align-self: start; }
.footer-org img { max-width: 320px; }
  .hero { min-height: 0; padding: calc(var(--nav-h) + 64px) 0 72px; }
  .hero-stats { margin-top: 38px; padding-top: 26px; gap: 26px 0; }
}

@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .hero-title { font-size: 23px; letter-spacing: 0; }
  .hero-accent { font-size: 18px; }
  .logo-cell { width: 150px; height: 64px; padding: 8px 12px; }
  .marquee-track { gap: 10px; }
  .hero-eyebrow { font-size: 12px; letter-spacing: .3px; text-wrap: balance; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .stat { padding: 6px 0; }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid rgba(255, 255, 255, .07); padding-top: 18px; margin-top: 6px; }
  .stat-num { font-size: 30px; }
  .sec-head { margin-bottom: 34px; }
  .about-points { grid-template-columns: 1fr; }
  .scope-card { flex: 0 0 calc((100% - 16px) / 2); }
  .why-grid { grid-template-columns: 1fr; }
  .vis-grid { grid-template-columns: 1fr; }
  .media-grid { gap: 10px; }
  .media-cell { flex: 0 0 calc((100% - 20px) / 3); }
  .media-cell { padding: 8px 10px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-org { text-align: center; }
  .footer-org { align-self: start; }
.footer-org img { margin: 0 auto; }
  .qr-img { width: 104px; height: 104px; }
  .forum-copy h3 { font-size: 18px; }
  .forum-meta { gap: 12px 20px; }
  .forum-panel { padding: 22px; border-radius: 16px; }
  .tab { height: 36px; padding: 0 16px; font-size: 13.5px; }
  .btn-lg { height: 48px; padding: 0 22px; }
  .cta-band { padding: 68px 0; }
  .footer-bottom-inner { flex-direction: column; gap: 6px; }
}

/* ---------- 内页：参展申请 ---------- */
.page-head {
  position: relative;
  padding: calc(var(--nav-h) + 88px) 0 60px;
  background: #060918;
  border-bottom: 1px solid rgba(255, 255, 255, .05);
  text-align: center;
  overflow: hidden;
}
.page-head::before {
  content: "";
  position: absolute;
  right: -8%; top: -60%;
  width: 78%; height: 190%;
  background: radial-gradient(closest-side, rgba(70, 120, 210, .3), rgba(40, 80, 160, .12) 45%, transparent 72%);
  transform: rotate(-14deg);
  filter: blur(30px);
  pointer-events: none;
}
.page-head::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(115deg, #060918 26%, rgba(6, 9, 24, .55) 52%, rgba(6, 9, 24, .9) 100%);
  pointer-events: none;
}
.page-head-glow {
  position: absolute; left: 50%; top: -180px;
  width: 760px; height: 380px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(108, 92, 231, .22), transparent 72%);
  filter: blur(24px);
  pointer-events: none;
}
.page-head .container { position: relative; z-index: 2; }

.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  text-align: left;
  font-size: 13px;
  color: #6e7681;
  margin-bottom: 34px;
  position: relative;
}
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { color: #3a4256; }
.crumbs em { font-style: normal; color: #8b949e; }

.page-head h1 {
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .5px;
  color: var(--text);
}
.page-sub {
  margin: 14px auto 0;
  max-width: 600px;
  font-size: 16px;
  line-height: 1.75;
  color: #8b949e;
}

.apply-section { padding: 80px 0 80px; background: var(--bg); }

/* 展会横幅：1 张宽幅设计图 */
.apply-banner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1232 / 231;
  min-height: 196px;
  padding: 0 170px;
  border-radius: 12px;
  overflow: hidden;
  isolation: isolate;
  margin-bottom: 32px;
  background:
    radial-gradient(120% 140% at 82% -20%, rgba(0, 200, 255, .28), transparent 58%),
    radial-gradient(90% 150% at 12% 130%, rgba(80, 70, 200, .35), transparent 62%),
    linear-gradient(104deg, #0a2a63 0%, #14418c 38%, #143a8a 62%, #0a1f4a 100%);
  border: 1px solid rgba(88, 166, 255, .22);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .38);
}
.ab-img {
  position: absolute; inset: 0; z-index: -3;
  width: 100%; height: 100%;
  object-fit: cover;
}
.ab-veil {
  position: absolute; inset: 0; z-index: -2;
  background: linear-gradient(100deg, rgba(6, 20, 48, .72) 0%, rgba(8, 24, 60, .5) 45%, rgba(6, 18, 44, .72) 100%);
}
.ab-graphic {
  position: absolute; right: 0; top: 0; bottom: 0; z-index: -1;
  width: 38%;
  background-image: radial-gradient(rgba(170, 220, 255, .55) 1.1px, transparent 1.2px);
  background-size: 9px 9px;
  mask-image: radial-gradient(58% 70% at 64% 50%, #000 0%, rgba(0, 0, 0, .55) 44%, transparent 76%);
  -webkit-mask-image: radial-gradient(58% 70% at 64% 50%, #000 0%, rgba(0, 0, 0, .55) 44%, transparent 76%);
  opacity: .9;
}
.ab-graphic::after {
  content: "";
  position: absolute; right: 4%; top: 50%;
  width: 58%; height: 150%;
  transform: translateY(-50%);
  border-radius: 50%;
  border: 1px solid rgba(120, 210, 255, .22);
}
.ab-mark {
  position: absolute; left: 34px; top: 50%;
  width: 56px; height: 56px;
  transform: translateY(-50%);
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--grad);
  color: #fff; font-size: 17px; font-weight: 800; letter-spacing: .5px;
  box-shadow: 0 8px 22px rgba(20, 30, 90, .55), 0 0 0 1px rgba(255, 255, 255, .18) inset;
  z-index: 2;
}
.ab-copy { position: relative; z-index: 2; text-align: center; }
.ab-copy strong {
  display: block;
  font-size: clamp(18px, 2.5vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .8px;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 20, 60, .5);
}
.ab-copy em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 2px;
  color: rgba(190, 220, 255, .8);
}
.ab-copy b {
  display: block;
  margin-top: 12px;
  font-size: clamp(14px, 1.7vw, 23px);
  font-weight: 700;
  letter-spacing: .5px;
  color: #d9ecff;
}
.ab-when {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.ab-when i { font-style: normal; }
.ab-when i:first-child {
  font-size: clamp(14px, 1.3vw, 17px);
  font-weight: 700;
  color: #fff;
  letter-spacing: .6px;
  font-variant-numeric: tabular-nums;
}
.ab-when i:last-child {
  font-size: clamp(11px, 1vw, 13px);
  color: rgba(210, 232, 255, .82);
  letter-spacing: .4px;
}

/* 表单卡：满宽单块，对齐参考站 */
.form-section {
  background: #060918;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 48px;
}
.form-section h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .3px;
}
.h2-ic {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  border-radius: 8px;
  background: rgba(88, 166, 255, .12);
  color: #7fc0ff;
}
.h2-ic .ic { width: 17px; height: 17px; }
.form-hint { margin-top: 10px; font-size: 14px; color: #8b949e; }
.form-hint i { font-style: normal; color: #ff8080; }

.apply-form { margin-top: 30px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 22px; }
.fgroup { display: flex; flex-direction: column; }
.fgroup.full { grid-column: 1 / -1; }
.fgroup label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 9px;
}
.fgroup label i { font-style: normal; color: #ff8080; margin-left: 2px; }

.form-input {
  width: 100%;
  height: 46px;
  background: #0d1117;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  padding: 0 16px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.form-input::placeholder { color: #5a6577; }
.form-input:focus {
  border-color: rgba(88, 166, 255, .7);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, .12);
}
select.form-input {
  appearance: none;
  padding-right: 42px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 4.5L6 8l3.5-3.5' fill='none' stroke='%238b949e' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}
.fgroup.invalid .form-input { border-color: #d8514f; box-shadow: 0 0 0 3px rgba(216, 81, 79, .12); }
.ferr { display: block; font-size: 12.5px; color: #ff8a8a; margin-top: 7px; }
.ferr:empty { display: none; }

.agree {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  font-size: 14px;
  color: #8b949e;
  cursor: pointer;
}
.agree i { font-style: normal; color: #ff8080; }
.agree input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  width: 18px; height: 18px;
  flex: none;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  background: #0d1117;
  cursor: pointer;
  transition: background .18s, border-color .18s;
}
.agree input[type="checkbox"]:hover { border-color: #5877a8; }
.agree input[type="checkbox"]:checked { background: #6c5ce7; border-color: #6c5ce7; }
.agree input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 5px; top: 1px;
  width: 5px; height: 10px;
  border: 2px solid #fff;
  border-top: 0;
  border-left: 0;
  transform: rotate(42deg);
}

.apply-form .submit {
  width: 100%;
  height: 56px;
  margin-top: 22px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .5px;
}

.apply-success { text-align: center; padding: 26px 10px 10px; }
.ok-mark {
  width: 66px; height: 66px; margin: 0 auto 22px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(61, 220, 151, .12);
  border: 1px solid rgba(61, 220, 151, .4);
  color: #3ddc97;
  box-shadow: 0 0 0 8px rgba(61, 220, 151, .06);
}
.ok-mark .ic { width: 30px; height: 30px; stroke-width: 2.2; }
.apply-success h2 { justify-content: center; display: block; }
.apply-success > p { margin-top: 14px; color: #8b949e; font-size: 15px; }
.apply-success .ok-contact { color: #6e7681; font-size: 13.5px; }
.apply-success .ok-contact a { color: var(--accent); }
.apply-success .btn { margin-top: 26px; }

@media (max-width: 900px) {
  .apply-banner { aspect-ratio: auto; padding: 52px 28px 34px; min-height: 0; }
  .ab-mark { left: 24px; top: 18px; transform: none; width: 42px; height: 42px; font-size: 13px; }
  .ab-graphic { width: 62%; opacity: .5; }
  .ab-copy { margin-top: 34px; }
  .form-section { padding: 30px 24px 32px; }
  .form-section h2 { font-size: 20px; }
}

@media (max-width: 780px) {
  .apply-section { padding: 40px 0 56px; }
  .form-grid { grid-template-columns: 1fr; gap: 16px; }
  .page-head { padding: calc(var(--nav-h) + 52px) 0 44px; }
  .crumbs { margin-bottom: 24px; }
  .ab-copy strong { font-size: 18px; }
  .ab-copy b { font-size: 14px; margin-top: 10px; }
  .ab-when { gap: 10px 18px; margin-top: 10px; }
  .apply-form .submit { height: 50px; font-size: 15px; }
  .agree { align-items: flex-start; font-size: 13px; }
}

/* ---------- 语言切换 ---------- */
.nav-lang { display: flex; align-items: center; gap: 10px; flex: none; }
.nav-divider { width: 1px; height: 18px; background: rgba(255, 255, 255, .14); flex: none; }

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 6px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .3px;
  white-space: nowrap;
  flex: none;
  transition: color .2s, border-color .2s, background .2s, box-shadow .2s;
}
.lang-btn .ic { width: 13px; height: 13px; color: #8bb6e8; flex: none; }
.lb-text { display: inline-flex; align-items: center; }
.lb-a { color: #fff; }
.lb-sl { color: rgba(255, 255, 255, .26); margin: 0 2px; }
.lb-b { color: var(--text-3); }
.lang-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, .07);
}
.lang-btn:hover .lb-b { color: #cfe4ff; }
.lang-btn:hover .ic { color: #a8d0ff; }
.nav-drawer-lang { display: flex; justify-content: center; margin-top: 16px; }
.nav-drawer-lang .lang-btn { height: 42px; padding: 0 20px; font-size: 13.5px; border-radius: 10px; }

/* 移动端顶栏只留 logo 与汉堡，语言按钮收进抽屉 */
@media (max-width: 1100px) {
  .nav-lang { display: none; }
}


/* 宽屏：语言键贴到页面最右侧，保留安全间距 */
@media (min-width: 1440px) {
  .nav-lang {
    position: absolute;
    right: 36px;
    top: 50%;
    transform: translateY(-50%);
    margin: 0;
  }
  .nav-divider { display: none; }
}


/* 展品范围：应用领域图片卡 */
.scope-card--img {
  padding: 0;
  border: none;
  background: none;
  border-radius: 12px;
  overflow: hidden;
  line-height: 0;
}
.scope-card--img::before { display: none; }
.scope-card--img img {
  width: 100%;
  height: auto;
  aspect-ratio: 1626 / 626;
  object-fit: cover;
  display: block;
  border-radius: 12px;
  transition: transform .5s var(--ease);
}
.scope-card--img:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(0, 0, 0, .45); }
.scope-card--img:hover img { transform: scale(1.045); }


/* 表单页横幅左上角圆标：支持图片 */
.ab-mark.has-img { background: #033f9f; overflow: hidden; }
.ab-mark.has-img img { width: 100%; height: 100%; object-fit: cover; display: block; transform: scale(.86); }

/* ---------- 页脚备案栏 ---------- */
.footer-bottom p { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.footer-bottom a { color: var(--text-3); transition: color .2s; }
.footer-bottom a:hover { color: var(--text); }
.fb-sep { color: rgba(255, 255, 255, .22); }
.fb-map { margin-left: 10px; }

/* ---------- 隐私政策页 ---------- */
.legal-section { padding: calc(var(--nav-h) + 64px) 0 96px; }
.legal { max-width: 820px; margin: 0 auto; }
.legal-back { display: inline-block; font-size: 13px; color: var(--text-3); margin-bottom: 22px; }
.legal-back:hover { color: var(--text); }
.legal h1 { font-size: clamp(26px, 3vw, 34px); margin-bottom: 10px; }
.legal-updated { font-size: 13px; color: var(--text-3); margin-bottom: 28px; }
.legal-intro { font-size: 15.5px; color: var(--text-2); line-height: 1.85; margin-bottom: 34px; }
.legal h2 { font-size: 17.5px; margin: 30px 0 10px; color: var(--text); }
.legal p { font-size: 15px; color: var(--text-2); line-height: 1.85; }