/* PIoT Han Sans = Source Han Sans CN 2.005R 子集（SIL OFL 1.1，见 media/fonts/OFL.txt）。core 层 = 页面实际画出的字；ext 层按需加载。 */
@font-face{font-family:"PIoT Han Sans";src:url(media/fonts/piot-hans-400-core.woff2) format("woff2");font-weight:400;font-display:swap;unicode-range:U+20-a9,U+b0,U+b7,U+d7,U+2026,U+2192,U+3000-3002,U+33a1-4e5f,U+4e66-4e92,U+4ea4-4ece,U+4ee3-505c,U+5143-5168,U+5171-51b5,U+51fa-52a9,U+5305-5357,U+536b-53ca,U+53d1-5411,U+542f-56fe,U+5728-5747,U+578b-5851,U+5883-5929,U+5956-5b9e,U+5bb6-5c55,U+5d4c-5f84,U+5faa-6253,U+626b-628a,U+62a5-62c6,U+62d6-642d,U+649e-6548,U+6559-65cb,U+65e5-662f,U+667a-6761,U+6781-6784,U+679c-68c0,U+6b21-6c5f,U+6c7d-6cca,U+6ce2-6e2f,U+6f14-76f4,U+7701-7bb1,U+7cfb-7ea2,U+7ea7-7edf,U+7eed-80fd,U+81c2-83b7,U+8457-89c1,U+89c4-8ba1,U+8bae-8c61,U+8d27-8d85,U+8dd1-8f86,U+8f93-9020,U+9053-91cd,U+94a2-95e8,U+95ee-9632,U+9662-9879,U+9891-98ce,U+9a71-9f99,U+ff0c,U+ff1a-ff1b}
@font-face{font-family:"PIoT Han Sans";src:url(media/fonts/piot-hans-400-ext.woff2) format("woff2");font-weight:400;font-display:swap;unicode-range:U+ab-ae,U+b1,U+bb,U+f7-201d,U+2039-2191,U+2193-2265,U+3008-30fb,U+4e60,U+4e94,U+4ed3,U+50cf,U+516c,U+51c6,U+52bf,U+5361,U+53cd,U+542b,U+5706,U+5757,U+5854,U+5931-5934,U+5ba4,U+5cb8,U+5f97,U+6267,U+62a4,U+62cd,U+6444,U+6551,U+65e0,U+666e-666f,U+6765-677f,U+6790,U+6a21,U+6c60,U+6cd5,U+6e90,U+76f8,U+7c73,U+7ea6,U+7ee9,U+8111-811a,U+83dc,U+89c2,U+8ba9,U+8d25,U+8d8a-8d8b,U+8f91,U+904d,U+91ce,U+95ed,U+9635,U+9884,U+9988-9996,U+ff01-ff0b,U+ff0d-ff19,U+ff1f-ff5e}
@font-face{font-family:"PIoT Han Sans";src:url(media/fonts/piot-hans-700-core.woff2) format("woff2");font-weight:700;font-display:swap;unicode-range:U+20-a0,U+b0,U+b7,U+d7,U+201c-2026,U+3000,U+3002,U+4e00,U+4e0a-4e0e,U+4e24-4e2a,U+4e3a-4e3b,U+4e60,U+4e86,U+4e8e-4ea4,U+4eba,U+4ece,U+4ee3,U+4eec-4ef6,U+4efd-4eff,U+4fe1,U+5143,U+5149-516c,U+5173,U+5185-5199,U+51c6,U+5230-5236,U+52a1-52a8,U+5361,U+5373,U+53cd-53d1,U+53d8-53e3,U+53f0,U+53f7,U+540a-540c,U+5668,U+56fe,U+5728,U+57df,U+5854,U+58f0,U+5907-591a,U+5957,U+59cb,U+5b66,U+5b9e-5ba4,U+5c0f,U+5c4f,U+5cb8-5de5,U+5e03-5e08,U+5e73,U+5ea6-5ea7,U+5f00-5f0f,U+5f55,U+5f97,U+611f-6211,U+6240,U+6267,U+628a-62a4,U+62e9,U+6309,U+638c,U+63a7,U+6548-6559,U+65ad,U+65cb-65e0,U+65f6,U+666e-667a,U+670d,U+672c,U+673a,U+6765,U+6784,U+679c-67b6,U+6807,U+6865,U+68c0,U+6b62,U+6beb,U+6c7d-6cb3,U+6ce2,U+6e2f,U+6f14-6fc0,U+706f,U+70e7,U+7136,U+7269,U+73ed-751f,U+7535,U+7684,U+76d8-76ee,U+76f8,U+770b-771f,U+77e5-7801,U+786c,U+793a,U+79d2,U+79fb-7a3f,U+7aef,U+7b97,U+7c73,U+7ea6-7ea7,U+7ed3,U+7f16-7f51,U+8054-8111,U+81ea,U+822a,U+8239,U+8282,U+884c,U+88c5,U+89c1-89c6,U+8ba1-8ba9,U+8bb2-8bbe,U+8bc4-8bca,U+8bd1,U+8bef,U+8bfe-8c31,U+8d27,U+8d70-8d8a,U+8ddf-8def,U+8e2a,U+8f66,U+8f6c,U+8f6f,U+8f86,U+8fb9-8fbe,U+8fd0,U+8fdb,U+9009,U+901a,U+904d-9053,U+914d,U+91cd-91ce,U+9519-95e8,U+95f8-9605,U+968f,U+96c6,U+96f7,U+97f3,U+9879-9891,U+9988,U+9a71-9a8c,U+9f99,U+ff0c}
@font-face{font-family:"PIoT Han Sans";src:url(media/fonts/piot-hans-700-ext.woff2) format("woff2");font-weight:700;font-display:swap;unicode-range:U+a9-ae,U+b1,U+bb,U+f7-2019,U+2039-2265,U+3001,U+3008-33a1,U+4e09,U+4e13-4e1a,U+4e2d,U+4e48-4e5f,U+4e66,U+4e8c,U+4ea7-4eab,U+4ec0,U+4ed3,U+4ee4-4eea,U+4efb,U+4f1a-4fa7,U+5019-50cf,U+5148,U+5171,U+5177,U+51b3-51b5,U+51fa-522b,U+523b-529f,U+52a9-5357,U+536b,U+539f-53ca,U+53d7,U+53ef,U+53f3,U+5408,U+5411-54ea,U+56fd,U+5706,U+5747-578b,U+5802-5851,U+5883,U+5904,U+5929-5956,U+597d,U+5b50-5b58,U+5b81-5b9a,U+5bb6-5bfc,U+5c31-5c45,U+5c55,U+5de6-5e02,U+5e26-5e72,U+5e74-5e95,U+5efa,U+5f20-5f53,U+5f62-5f84,U+5faa-610f,U+6216-6237,U+6247-6253,U+626b-6280,U+62a5-62d6,U+62ff-6307,U+636e-6388,U+63a5,U+63cf-653e,U+6563-6599,U+65b0-65c1,U+65e5,U+661f-662f,U+66f4-6709,U+671f,U+672f,U+6743-6761,U+677f-6781,U+6790,U+67e5-67f3,U+6821-684c,U+68af-68b0,U+6a21-6b21,U+6b63-6bcf,U+6c34-6c60,U+6cbb-6cd5,U+6ce8-6e05,U+6e90,U+706b,U+70b9,U+7130,U+7248,U+72b6-73b0,U+7528-7533,U+754c-7559,U+76d6,U+76f4,U+7701,U+7740,U+7814,U+788d-78c1,U+7981-79d1,U+79ef,U+7ade,U+7b49-7b56,U+7ba1-7bb1,U+7cfb-7ea2,U+7ebf-7ec8,U+7ed9-7efc,U+7f72-8003,U+811a-81c2,U+81f4,U+8236,U+8258-8272,U+83b7-878d,U+8865,U+897f-8986,U+89c9-8b66,U+8bae,U+8bc1,U+8bcd,U+8bd5,U+8bf4-8bf7,U+8c61-8d25,U+8d44-8d5b,U+8d8b-8ddd,U+8df3,U+8eab,U+8f68,U+8f6e,U+8f7d-8f85,U+8f91-8f93,U+8fc7,U+8fd1-8fd9,U+8fdc-9002,U+9012,U+901f-9020,U+9065-90fd,U+91cc,U+94a2-94fe,U+95ed-95f4,U+961f-9662,U+969c,U+96f6,U+9700-9762,U+9875,U+98ce,U+9996,U+9aa4-9ed4,U+ff01-ff0b,U+ff0d-ff5e}
/* PIoT 官网 · 深色科技风
   色彩：品牌蓝 #025e9f / 界面蓝 #2f6fed / AI 紫 #7b39f5（只用于 AI 工作状态） */

:root {
  --bg: #05070c;
  --bg-2: #080b13;
  --panel: rgba(255, 255, 255, .035);
  --panel-2: rgba(255, 255, 255, .06);
  --line: rgba(255, 255, 255, .08);
  --line-2: rgba(255, 255, 255, .14);
  --text: #eef2f8;
  --text-2: #a9b3c4;
  --text-3: #6b778a;
  --brand: #025e9f;
  --blue: #2f6fed;
  --blue-2: #5b9bff;
  --cyan: #46d3ff;
  --ai: #7b39f5;
  --ai-2: #b48cff;
  --ok: #2bd88f;
  --radius: 20px;
  --radius-sm: 12px;
  --wrap: 1240px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --spring: cubic-bezier(.34, 1.56, .64, 1);
  --font: "PIoT Han Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, "Roboto Mono", "PIoT Han Sans", monospace;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
}

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

img, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
::selection { background: rgba(47, 111, 237, .45); color: #fff; }

:focus-visible { outline: 2px solid var(--blue-2); outline-offset: 3px; border-radius: 6px; }

.progress {
  position: fixed; inset: 0 0 auto; height: 2px; z-index: 60; pointer-events: none;
}
.progress i {
  display: block; height: 100%; transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue), var(--cyan), var(--ai-2));
  box-shadow: 0 0 12px rgba(70, 211, 255, .6);
}

body::after {
  content: ""; position: fixed; inset: 0; z-index: 55; pointer-events: none;
  opacity: .028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.skip {
  position: fixed; left: 16px; top: -60px; z-index: 100;
  padding: 10px 16px; border-radius: 10px; background: #fff; color: #000;
  transition: top .2s;
}
.skip:focus { top: 16px; }

.wrap {
  width: min(var(--wrap), 100% - 48px);
  margin-inline: auto;
}

/* ---------- 字体与通用 ---------- */

h1, h2 {
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.12;
  text-wrap: balance;
}

h2 { font-size: clamp(32px, 4.6vw, 60px); }
h3 { font-size: 20px; font-weight: 650; line-height: 1.4; letter-spacing: -.005em; }

.grad {
  background: linear-gradient(100deg, #fff 0%, #9cc4ff 38%, var(--blue-2) 62%, var(--cyan) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.grad-ai {
  background: linear-gradient(100deg, #e9ddff 0%, var(--ai-2) 45%, #8f6bff 70%, var(--blue-2) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

.nw { white-space: nowrap; }

.kicker {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--blue-2);
  text-transform: uppercase;
  margin-bottom: 20px;
  display: inline-flex; align-items: center; gap: 10px;
}
.kicker::before {
  content: ""; width: 18px; height: 1px; background: currentColor; opacity: .7;
}
.center .kicker::after { content: ""; width: 18px; height: 1px; background: currentColor; opacity: .7; }

.lead {
  font-size: clamp(16px, 1.35vw, 18.5px);
  color: var(--text-2);
  max-width: 640px;
  line-height: 1.8;
}
.lead b { color: var(--text); font-weight: 600; }
.lead .hl { color: var(--blue-2); }

.head { margin-bottom: clamp(48px, 6vw, 80px); }
.head h2 { margin-bottom: 22px; }
.head.center { text-align: center; }
.head.center .lead { margin-inline: auto; }

.section { position: relative; padding: clamp(96px, 12vw, 168px) 0; }

.note { margin-top: 36px; color: var(--text-3); font-size: 14px; text-align: center; }

.majors {
  margin-top: 20px; padding: 26px 30px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255, 255, 255, .02);
  display: flex; align-items: center; gap: 28px;
}
.majors-label { font-size: 14px; color: var(--text-3); white-space: nowrap; }
.majors ul { display: flex; flex-wrap: wrap; gap: 8px; }
.majors li {
  padding: 7px 15px; border-radius: 999px;
  font-size: 13.5px; color: var(--text-2);
  border: 1px solid var(--line-2);
  transition: color .2s, border-color .2s, background .2s;
}
.majors li:hover { color: #fff; border-color: rgba(91, 155, 255, .5); background: rgba(47, 111, 237, .12); }

.card {
  position: relative;
  background: linear-gradient(180deg, rgba(255, 255, 255, .045), rgba(255, 255, 255, .015));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05);
}

/* ---------- 按钮 ---------- */

.actions { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }

.btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 50px; padding: 0 26px;
  border-radius: 999px;
  font-size: 15.5px; font-weight: 600;
  white-space: nowrap;
  transition: transform .35s var(--spring), background .25s, box-shadow .3s, border-color .25s, color .25s;
}
.btn:active { transform: scale(.97); }
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; }

.btn-primary {
  background: linear-gradient(180deg, #4f86ff, var(--blue));
  color: #fff;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .14) inset, 0 10px 30px -8px rgba(47, 111, 237, .7), 0 0 rgba(47, 111, 237, .4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(255, 255, 255, .2) inset, 0 16px 40px -8px rgba(47, 111, 237, .85), 0 0 0 6px rgba(47, 111, 237, .14); }

.btn-light { background: #fff; color: #05070c; }
.btn-light:hover { background: #dfe8ff; }

.btn-ghost {
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line-2);
  color: var(--text);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .26); transform: translateY(-2px); }

.play {
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(255, 255, 255, .14);
  position: relative;
}
.play::after {
  content: ""; position: absolute; left: 8.5px; top: 6.5px;
  border-left: 7px solid #fff; border-top: 4.5px solid transparent; border-bottom: 4.5px solid transparent;
}

/* ---------- 导航 ---------- */

.nav {
  position: fixed; inset: 0 0 auto; z-index: 50;
  transition: background .35s, border-color .35s, backdrop-filter .35s;
  border-bottom: 1px solid transparent;
}
.nav.is-solid {
  background: rgba(5, 7, 12, .72);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom-color: var(--line);
}
.nav-inner {
  width: min(1320px, 100% - 40px); margin-inline: auto;
  height: 68px; display: flex; align-items: center; gap: 32px;
}
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand .mark { height: 28px; width: auto; aspect-ratio: 7087 / 2363; }

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  position: relative;
  padding: 8px 14px; border-radius: 999px;
  font-size: 14.5px; color: var(--text-2);
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, .06); }
.nav-links a.is-active { color: var(--text); }
.nav-links a.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: 2px; width: 4px; height: 4px; margin-left: -2px;
  border-radius: 50%; background: var(--blue-2); box-shadow: 0 0 8px var(--blue-2);
}

.nav-toggle {
  display: none; width: 42px; height: 42px; margin-left: auto;
  border-radius: 12px; position: relative;
}
.nav-toggle span {
  position: absolute; left: 12px; right: 12px; height: 1.5px; background: var(--text);
  transition: transform .35s var(--ease);
}
.nav-toggle span:first-child { top: 16px; }
.nav-toggle span:last-child { top: 24px; }
.menu-open .nav-toggle span:first-child { transform: translateY(4px) rotate(45deg); }
.menu-open .nav-toggle span:last-child { transform: translateY(-4px) rotate(-45deg); }

.nav-menu {
  position: fixed; inset: 0; z-index: 40;
  padding: 96px 28px 40px;
  background: rgba(5, 7, 12, .94);
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column;
  opacity: 0; visibility: hidden;
  transition: opacity .3s, visibility .3s;
}
.nav-menu a {
  font-size: 28px; font-weight: 650; padding: 14px 0;
  border-bottom: 1px solid var(--line);
  transform: translateY(12px); opacity: 0;
  transition: transform .5s var(--ease), opacity .5s;
}
.menu-open .nav-menu { opacity: 1; visibility: visible; }
.menu-open .nav-menu a { transform: none; opacity: 1; }
.menu-open .nav-menu a:nth-child(2) { transition-delay: .03s; }
.menu-open .nav-menu a:nth-child(3) { transition-delay: .06s; }
.menu-open .nav-menu a:nth-child(4) { transition-delay: .09s; }
.menu-open .nav-menu a:nth-child(5) { transition-delay: .12s; }
.menu-open .nav-menu a:nth-child(6) { transition-delay: .15s; }
.menu-open .nav-menu a:nth-child(7) { transition-delay: .18s; color: var(--blue-2); }
.menu-open { overflow: hidden; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 150px 0 0;
  isolation: isolate;
  overflow-x: clip;
}
.hero-field {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: -2;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 85%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 85%);
}
.hero-aura {
  position: absolute; z-index: -1; pointer-events: none;
  left: 0; right: 0; top: 360px; height: 900px;
  background:
    radial-gradient(closest-side, rgba(47, 111, 237, .38), transparent 70%),
    radial-gradient(closest-side at 70% 40%, rgba(2, 94, 159, .35), transparent 70%),
    radial-gradient(closest-side at 30% 60%, rgba(70, 211, 255, .12), transparent 70%);
  filter: blur(40px);
  animation: aura 14s ease-in-out infinite alternate;
}
@keyframes aura {
  to { transform: translate3d(0, -40px, 0) scale(1.08); opacity: .85; }
}

.hero-copy { text-align: center; display: flex; flex-direction: column; align-items: center; }

.pill {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 5px 14px 5px 5px; margin-bottom: 30px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--line-2);
  font-size: 13.5px; color: var(--text-2);
  transition: background .25s, border-color .25s;
}
.pill:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .24); }
.pill i { font-style: normal; color: var(--text-3); transition: transform .3s var(--spring); }
.pill:hover i { transform: translateX(3px); color: var(--text); }
.pill-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em; font-weight: 700;
  padding: 3px 9px; border-radius: 999px;
  background: linear-gradient(90deg, var(--ai), var(--blue));
  color: #fff;
}

.hero h1 {
  font-size: clamp(34px, 6.2vw, 84px);
  line-height: 1.08;
  letter-spacing: -.03em;
  margin-bottom: 28px;
}
.hero h1 em { font-style: normal; }
.hero .lead { margin: 0 auto 40px; text-align: center; max-width: 680px; }

.hero-stage {
  position: relative;
  width: min(1240px, calc(100% - 120px));
  margin: 84px auto 0;
  perspective: 2200px;
}
.hero-window {
  transform: rotateX(var(--rx, 16deg)) rotateY(var(--ry, 0deg)) translateZ(0);
  transform-origin: 50% 0%;
  transition: transform .9s var(--ease);
  will-change: transform;
}
.hero-stage::before {
  content: ""; position: absolute; inset: 8% 6% -6%; z-index: -1;
  background: radial-gradient(closest-side, rgba(47, 111, 237, .55), transparent);
  filter: blur(60px);
}
/* 透视后窗口顶部会抬高，压住标题；用负边距把视觉落点拉回来 */
.hero-window { margin-top: clamp(20px, 4vw, 56px); }

.window {
  position: relative;
  border-radius: 16px;
  background: #0d121c;
  border: 1px solid rgba(255, 255, 255, .12);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, .5),
    0 1px 0 rgba(255, 255, 255, .08) inset,
    0 50px 100px -30px rgba(0, 0, 0, .8),
    0 30px 60px -40px rgba(47, 111, 237, .5);
  overflow: hidden;
}
.window-bar {
  height: 38px; display: flex; align-items: center; gap: 14px;
  padding: 0 14px;
  background: linear-gradient(180deg, #151b27, #10151f);
  border-bottom: 1px solid rgba(255, 255, 255, .07);
  font-size: 12.5px; color: var(--text-3);
}
.dots { display: flex; gap: 7px; }
.dots i { width: 11px; height: 11px; border-radius: 50%; background: #2a3242; }
.dots i:nth-child(1) { background: #ff5f57; }
.dots i:nth-child(2) { background: #febc2e; }
.dots i:nth-child(3) { background: #28c840; }
.window-title { flex: 1; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.window-state {
  font-family: var(--mono); font-size: 11px; letter-spacing: .04em;
  padding: 3px 9px; border-radius: 999px;
  background: rgba(255, 255, 255, .06); color: var(--text-2);
  white-space: nowrap;
}
.window-state.ai-state {
  color: #e6d9ff;
  background: linear-gradient(90deg, rgba(123, 57, 245, .35), rgba(47, 111, 237, .25));
  box-shadow: 0 0 0 1px rgba(180, 140, 255, .3) inset;
}
.window-state.ai-state::before {
  content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 6px; vertical-align: 1px;
  border-radius: 50%; background: var(--ai-2); box-shadow: 0 0 8px var(--ai-2);
  animation: blink 1.6s ease-in-out infinite;
}
@keyframes blink { 50% { opacity: .3; } }

.window-body { position: relative; aspect-ratio: 16 / 9; background: #f4f6fa; }
.window-body video, .window-body img { width: 100%; height: 100%; object-fit: cover; }

.float-chip {
  position: absolute; z-index: 3;
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  border-radius: 14px;
  background: rgba(14, 19, 30, .72);
  border: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, .7);
  font-size: 13.5px; color: var(--text-2);
  animation: float 7s ease-in-out infinite;
}
.float-chip b { font-size: 26px; line-height: 1; color: #fff; font-weight: 700; letter-spacing: -.02em; }
.chip-a { left: -36px; top: 30%; }
.chip-b { right: -28px; top: 18%; animation-delay: -2.4s; }
.chip-c { left: 8%; bottom: -26px; animation-delay: -4.6s; }
.ok { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 10px var(--ok); }
.spark {
  width: 16px; height: 16px; border-radius: 5px;
  background: conic-gradient(from 0deg, var(--ai), var(--blue-2), var(--ai-2), var(--ai));
  animation: spin 3s linear infinite;
}
.ai-chip { border-color: rgba(180, 140, 255, .35); color: #e2d6ff; }
@keyframes float { 50% { transform: translateY(-12px); } }
@keyframes spin { to { transform: rotate(360deg); } }

.hero-robot {
  position: absolute; z-index: 4;
  right: -70px; bottom: -30px;
  width: clamp(110px, 13vw, 180px);
  filter: drop-shadow(0 30px 40px rgba(0, 0, 0, .6));
  animation: float 6s ease-in-out infinite -1s;
}

.marquee {
  position: relative;
  margin-top: 110px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee-track { display: flex; width: max-content; animation: marquee 48s linear infinite; }
.marquee span {
  display: flex; align-items: center; gap: 40px;
  padding-right: 40px;
  font-size: 15px; color: var(--text-3); white-space: nowrap;
}
.marquee span::after { content: ""; width: 5px; height: 5px; border-radius: 50%; background: rgba(255, 255, 255, .18); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 指标 ---------- */

.proof { padding: 72px 0 0; }
.proof-grid {
  display: grid; grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255, 255, 255, .02);
  overflow: hidden;
}
.stat { padding: 30px 24px 26px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat b {
  font-size: clamp(30px, 3vw, 42px); font-weight: 700; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
}
.stat .unit { margin-left: 6px; font-size: 14px; color: var(--blue-2); font-family: var(--mono); }
.stat p { margin-top: 6px; color: var(--text-3); font-size: 13.5px; }

/* ---------- 云边端 ---------- */

.tiers {
  display: grid;
  grid-template-columns: 1fr 48px 1fr 48px 1fr;
  align-items: stretch;
}
.tier { padding: 34px 30px 30px; overflow: hidden; }
.tier::before {
  content: ""; position: absolute; inset: 0 0 auto; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(91, 155, 255, .7), transparent);
}
.tier-top { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 30px; }
.tier-ix {
  width: 52px; height: 52px; border-radius: 14px;
  display: grid; place-items: center;
  font-size: 22px; font-weight: 700;
  background: linear-gradient(160deg, rgba(91, 155, 255, .25), rgba(2, 94, 159, .15));
  border: 1px solid rgba(91, 155, 255, .35);
  box-shadow: 0 0 30px -6px rgba(47, 111, 237, .6);
}
.tier-en { font-family: var(--mono); font-size: 12px; color: var(--text-3); letter-spacing: .2em; }
.tier h3 { font-size: 22px; margin-bottom: 12px; }
.tier p { color: var(--text-2); font-size: 15px; margin-bottom: 22px; }
.tier p b { color: #fff; }
.ticks li {
  position: relative; padding: 9px 0 9px 22px;
  border-top: 1px dashed var(--line); font-size: 14px; color: var(--text-2);
}
.ticks li::before {
  content: ""; position: absolute; left: 2px; top: 50%; width: 8px; height: 8px; margin-top: -4px;
  border-radius: 2px; border: 1.5px solid var(--blue-2); transform: rotate(45deg);
}
.tier-link { position: relative; }
.tier-link i {
  position: absolute; left: 0; right: 0; top: 50%; height: 1px;
  background: linear-gradient(90deg, rgba(91, 155, 255, .1), rgba(91, 155, 255, .6), rgba(91, 155, 255, .1));
}
.tier-link i::after {
  content: ""; position: absolute; top: -3px; left: 0; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 12px var(--cyan);
  animation: flow 2.4s var(--ease) infinite;
}
@keyframes flow { from { left: 0; opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } to { left: calc(100% - 7px); opacity: 0; } }

.five {
  margin-top: 28px;
  display: flex; align-items: center; gap: 28px;
  padding: 22px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(2, 94, 159, .16), rgba(255, 255, 255, .02));
}
.five-label { font-weight: 700; font-size: 17px; white-space: nowrap; }
.five ul { display: flex; flex-wrap: wrap; gap: 10px; flex: 1; justify-content: flex-end; }
.five li {
  padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--line-2); font-size: 14px; color: var(--text-2);
  background: rgba(5, 7, 12, .5);
}
.five li b { color: var(--blue-2); margin-right: 1px; }

/* ---------- 软件演示 ---------- */

.software::before {
  content: ""; position: absolute; inset: 10% 0 auto; height: 70%; z-index: -1;
  background: radial-gradient(ellipse 60% 50% at 70% 50%, rgba(123, 57, 245, .12), transparent 70%);
}

.player {
  display: grid; grid-template-columns: 360px 1fr; gap: 40px;
  align-items: center;
}
.player-list { display: flex; flex-direction: column; gap: 4px; }
.player-list button {
  width: 100%; text-align: left;
  display: block; padding: 16px 20px 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  transition: background .3s, border-color .3s;
  position: relative;
}
.player-list button:hover { background: rgba(255, 255, 255, .03); }
.player-list button[aria-selected="true"] {
  background: rgba(255, 255, 255, .045);
  border-color: var(--line);
}
.pl-head { display: flex; align-items: center; gap: 12px; font-size: 17px; font-weight: 650; color: var(--text-3); transition: color .3s; }
[aria-selected="true"] .pl-head { color: var(--text); }
.pl-no { font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--text-3); }
.ai-tag {
  font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: .06em;
  padding: 2px 6px; border-radius: 5px;
  color: #e6d9ff; background: rgba(123, 57, 245, .3); border: 1px solid rgba(180, 140, 255, .35);
}
.pl-desc {
  display: grid; grid-template-rows: 0fr;
  font-size: 14px; color: var(--text-2); line-height: 1.7;
  transition: grid-template-rows .5s var(--ease), margin .5s var(--ease), opacity .4s;
  opacity: 0; overflow: hidden; padding-left: 31px;
}
[aria-selected="true"] .pl-desc { grid-template-rows: 1fr; margin-top: 8px; opacity: 1; }
.pl-bar {
  display: block; height: 2px; margin: 14px 0 0 31px; border-radius: 2px;
  background: rgba(255, 255, 255, .08); overflow: hidden;
  opacity: 0; transition: opacity .3s;
}
[aria-selected="true"] .pl-bar { opacity: 1; }
.pl-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
[data-ai][aria-selected="true"] .pl-bar i { background: linear-gradient(90deg, var(--ai), var(--ai-2)); }

.player-stage { position: relative; }
.player-window { transition: box-shadow .6s; }
.player-body { aspect-ratio: 16 / 9; }
.player-video {
  position: absolute; inset: 0;
  opacity: 0; transform: scale(1.02);
  transition: opacity .6s var(--ease), transform .9s var(--ease);
}
.player-video.is-on { opacity: 1; transform: none; }

/* AI 流光边框：只在 AI 功能播放时出现 */
[data-ai-glow]::before {
  content: ""; position: absolute; inset: -1px; z-index: 5; pointer-events: none;
  border-radius: inherit; padding: 1.5px;
  background: conic-gradient(from var(--a, 0deg), transparent 0 55%, var(--ai) 70%, var(--ai-2) 78%, var(--blue-2) 85%, transparent 95%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  opacity: 0; transition: opacity .6s;
  animation: sweep 4s linear infinite;
}
.player.is-ai [data-ai-glow]::before { opacity: 1; }
.player.is-ai .player-window { box-shadow: 0 0 0 1px rgba(0, 0, 0, .5), 0 50px 100px -30px rgba(0, 0, 0, .8), 0 30px 80px -30px rgba(123, 57, 245, .55); }
@property --a { syntax: "<angle>"; inherits: false; initial-value: 0deg; }
@keyframes sweep { to { --a: 360deg; } }

.ai-frame::before {
  content: ""; position: absolute; inset: -1px; z-index: 5; pointer-events: none;
  border-radius: inherit; padding: 1.5px;
  background: conic-gradient(from var(--a, 0deg), transparent 0 55%, var(--ai) 70%, var(--ai-2) 78%, var(--blue-2) 85%, transparent 95%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  animation: sweep 4s linear infinite;
}

/* ---------- 教师端 bento ---------- */

.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: auto;
  gap: 20px;
}
.tile { overflow: hidden; display: flex; flex-direction: column; transition: border-color .3s, transform .5s var(--ease); }
.tile:hover { border-color: var(--line-2); }
.tile figcaption { padding: 28px 28px 22px; }
.tile figcaption h3 { margin-bottom: 6px; }
.tile figcaption p { color: var(--text-2); font-size: 14.5px; }
.tile-shot {
  margin: auto 0 0 28px;
  border-radius: 12px 0 0 0;
  border: 1px solid var(--line-2); border-right: 0; border-bottom: 0;
  overflow: hidden;
  box-shadow: 0 -20px 50px -20px rgba(0, 0, 0, .6);
}
.tile-shot img { transition: transform 1.2s var(--ease); transform-origin: 0 0; }
.tile:hover .tile-shot img { transform: scale(1.03); }
.tile-xl { grid-column: span 2; grid-row: span 2; }
.tile-xl figcaption h3 { font-size: 24px; }
.tile-wide { grid-column: span 3; display: grid; grid-template-columns: 1fr 1.6fr; }
.tile-wide figcaption { align-self: center; padding: 36px; }
.tile-wide figcaption h3 { font-size: 24px; }
.tile-wide .tile-shot { margin: 36px 0 0; }

/* ---------- 数字人 ---------- */

.human::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(ellipse 50% 60% at 75% 50%, rgba(123, 57, 245, .16), transparent 70%);
}
.split { display: grid; grid-template-columns: 1fr 1.25fr; gap: 72px; align-items: center; }
.split-copy h2 { margin-bottom: 22px; }
.feature-list { margin-top: 36px; display: grid; gap: 4px; }
.feature-list li {
  display: grid; gap: 2px;
  padding: 16px 0 16px 22px;
  border-left: 2px solid rgba(180, 140, 255, .25);
}
.feature-list li:hover { border-left-color: var(--ai-2); }
.feature-list b { font-size: 16px; }
.feature-list span { color: var(--text-2); font-size: 14.5px; }

/* ---------- 硬件 ---------- */

.hardware { background: linear-gradient(180deg, transparent, rgba(2, 94, 159, .08) 30%, transparent); }

.seg {
  position: relative;
  display: flex; width: max-content; max-width: 100%;
  margin: -24px auto 64px;
  padding: 5px; border-radius: 999px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--line);
}
.seg button {
  position: relative; z-index: 1;
  padding: 11px 24px; border-radius: 999px;
  font-size: 15px; color: var(--text-2); font-weight: 550;
  transition: color .3s;
}
.seg button[aria-selected="true"] { color: #05070c; }
.seg-thumb {
  position: absolute; top: 5px; bottom: 5px; left: 5px;
  border-radius: 999px; background: #fff;
  transition: transform .55s var(--spring), width .55s var(--spring);
}

.lab[hidden] { display: none; }
.lab.is-on { animation: lab-in .8s var(--ease); }
@keyframes lab-in { from { transform: translateY(18px); } }

.lab-hero { display: grid; grid-template-columns: 1.35fr 1fr; gap: 56px; align-items: center; }
.lab-visual { position: relative; }
.lab-visual img { position: relative; width: 100%; filter: drop-shadow(0 40px 50px rgba(0, 0, 0, .55)); }
.lab-glow {
  position: absolute; inset: 15% 10% 5%;
  background: radial-gradient(closest-side, rgba(47, 111, 237, .45), transparent);
  filter: blur(50px);
}
.lab-spec h3 { font-size: clamp(24px, 2.4vw, 30px); margin-bottom: 14px; letter-spacing: -.01em; }
.lab-spec > p { color: var(--text-2); margin-bottom: 30px; }

.spec { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border-radius: 16px; overflow: hidden; border: 1px solid var(--line); }
.spec div { background: var(--bg-2); padding: 20px 22px; }
.spec dt { font-size: 13px; color: var(--text-3); margin-bottom: 4px; }
.spec dd { font-size: 14px; color: var(--text-2); }
.spec dd b { font-size: 30px; font-weight: 700; color: #fff; letter-spacing: -.02em; margin-right: 4px; font-variant-numeric: tabular-nums; }

.rail {
  margin-top: 64px;
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(230px, 1fr);
  gap: 16px;
  overflow-x: auto; overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
  scrollbar-width: thin; scrollbar-color: rgba(255, 255, 255, .15) transparent;
  cursor: grab;
}
.rail.is-drag { cursor: grabbing; scroll-snap-type: none; }
.rail.is-drag * { pointer-events: none; }
.kit {
  scroll-snap-align: start;
  padding: 18px 20px 22px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .012));
  border: 1px solid var(--line);
  transition: border-color .3s, transform .5s var(--ease), background .3s;
}
.kit:hover { border-color: rgba(91, 155, 255, .4); transform: translateY(-4px); background: linear-gradient(180deg, rgba(47, 111, 237, .1), rgba(255, 255, 255, .012)); }
.kit img {
  width: 100%; height: 150px; object-fit: contain; margin-bottom: 16px;
  filter: drop-shadow(0 16px 18px rgba(0, 0, 0, .5));
  transition: transform .6s var(--spring);
  user-select: none; -webkit-user-drag: none;
}
.kit:hover img { transform: scale(1.06); }
.kit h4 { font-size: 16px; font-weight: 650; margin-bottom: 4px; }
.kit p { font-size: 13px; color: var(--text-3); line-height: 1.6; }
.rail-hint { margin-top: 10px; font-size: 13px; color: var(--text-3); text-align: right; }

/* ---------- 巡检小车 ---------- */

.robot {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 140px 0;
  overflow: hidden;
  background: #000;
}
.robot-media { position: absolute; inset: 0; z-index: 0; }
.robot-media video { width: 100%; height: 100%; object-fit: cover; object-position: 70% 50%; }
.robot-shade {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 7, 12, .95) 0%, rgba(5, 7, 12, .7) 38%, rgba(5, 7, 12, 0) 70%),
    linear-gradient(180deg, var(--bg) 0%, transparent 18%, transparent 82%, var(--bg) 100%);
}
.robot-copy { position: relative; z-index: 1; }
.robot-copy h2 { margin-bottom: 22px; }
.robot-copy .lead { max-width: 480px; }
.sensors {
  margin-top: 48px;
  display: grid; grid-template-columns: repeat(2, minmax(0, 230px)); gap: 12px;
}
.sensors li {
  padding: 18px 20px;
  border-radius: 14px;
  background: rgba(10, 14, 22, .55);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.sensors b { font-size: 30px; font-weight: 700; letter-spacing: -.02em; margin-right: 8px; }
.sensors span { font-size: 14.5px; font-weight: 600; }
.sensors p { font-size: 13px; color: var(--text-3); margin-top: 2px; }

/* ---------- 课程 ---------- */

.tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.track { padding: 34px 32px 32px; overflow: hidden; }
.track-lang {
  display: inline-block;
  font-family: var(--mono); font-size: 12px; letter-spacing: .06em;
  padding: 4px 10px; border-radius: 6px; margin-bottom: 16px;
  color: var(--blue-2); background: rgba(47, 111, 237, .12); border: 1px solid rgba(91, 155, 255, .25);
}
.track-head h3 { font-size: 26px; margin-bottom: 8px; letter-spacing: -.01em; }
.track-head p { color: var(--text-2); font-size: 15px; }
.track-hero { position: relative; height: 260px; margin: 18px 0 8px; display: grid; place-items: center; }
.track-hero::before {
  content: ""; position: absolute; inset: 20% 15%;
  background: radial-gradient(closest-side, rgba(47, 111, 237, .35), transparent); filter: blur(30px);
}
.track-hero img { position: relative; max-height: 100%; width: auto; filter: drop-shadow(0 26px 30px rgba(0, 0, 0, .55)); transition: transform .9s var(--ease); }
.track:hover .track-hero img { transform: translateY(-6px) rotate(-1.5deg); }
.track-labs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.track-labs li {
  padding: 10px 8px 12px; border-radius: 12px;
  background: rgba(255, 255, 255, .03); border: 1px solid var(--line);
  text-align: center; font-size: 12.5px; color: var(--text-2);
}
.track-labs img { height: 64px; width: 100%; object-fit: contain; margin-bottom: 8px; border-radius: 6px; }

/* ---------- 一节课 ---------- */

.steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  position: relative;
  counter-reset: s;
}
.steps::before {
  content: ""; position: absolute; left: 0; right: 0; top: 23px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-2) 8%, var(--line-2) 92%, transparent);
}
.steps li { position: relative; padding: 0 24px 0 0; }
.steps span {
  position: relative;
  display: grid; place-items: center;
  width: 46px; height: 46px; border-radius: 50%;
  font-family: var(--mono); font-size: 13px; color: var(--blue-2);
  background: var(--bg); border: 1px solid rgba(91, 155, 255, .4);
  box-shadow: 0 0 0 6px var(--bg), 0 0 24px -4px rgba(47, 111, 237, .6);
  margin-bottom: 24px;
}
.steps h3 { font-size: 22px; margin-bottom: 8px; }
.steps p { color: var(--text-2); font-size: 15px; }

.desks { margin-top: 96px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.desk { overflow: hidden; display: flex; flex-direction: column; }
.desk-copy { padding: 32px 32px 26px; }
.mini { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; color: var(--text-3); margin-bottom: 10px; }
.desk-copy h3 { font-size: 26px; margin-bottom: 8px; }
.desk-copy p:last-child { color: var(--text-2); font-size: 15px; }
.desk-shot {
  margin: auto 0 0 32px;
  border-radius: 12px 0 0 0; overflow: hidden;
  border: 1px solid var(--line-2); border-right: 0; border-bottom: 0;
  aspect-ratio: 16 / 9.4;
}
.desk-shot img { width: 100%; height: 100%; object-fit: cover; object-position: 0 0; transition: transform 1.2s var(--ease); transform-origin: 0 0; }
.desk:hover .desk-shot img { transform: scale(1.04); }

/* ---------- 关于 ---------- */

.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; }
.about-photo { overflow: hidden; min-height: 420px; }
.about-photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 2s var(--ease); }
.about-photo:hover img { transform: scale(1.04); }
.about-photo figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 80px 30px 28px;
  background: linear-gradient(180deg, transparent, rgba(5, 7, 12, .92));
  color: var(--text-2); font-size: 14.5px;
}
.about-photo figcaption b { display: block; font-size: 30px; color: #fff; letter-spacing: -.02em; margin-bottom: 4px; }
.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.astat {
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, .04), rgba(255, 255, 255, .01));
  display: flex; flex-direction: column; justify-content: space-between;
}
.astat b { font-size: clamp(30px, 3vw, 40px); font-weight: 700; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.astat p { color: var(--text-3); font-size: 13.5px; margin-top: 10px; }

.honors {
  margin-top: 20px;
  display: grid; grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.honors li { padding: 20px 18px; border-left: 1px solid var(--line); font-size: 13.5px; color: var(--text-2); }
.honors li:first-child { border-left: 0; }
.honors b { display: block; font-size: 24px; color: #fff; font-weight: 700; }

/* ---------- CTA ---------- */

.cta {
  position: relative;
  padding: clamp(120px, 14vw, 200px) 0 clamp(100px, 12vw, 160px);
  text-align: center;
  overflow: hidden;
  isolation: isolate;
  border-top: 1px solid var(--line);
}
.cta-aura {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 50% 40% at 50% 30%, rgba(47, 111, 237, .28), transparent 70%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(2, 94, 159, .25), transparent 70%);
}
.cta-aura::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .12) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000, transparent);
  mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000, transparent);
}
.mark-hero { width: min(640px, 86%); height: auto; aspect-ratio: 7087 / 2363; margin: 0 auto 56px; }
.cta h2 { font-size: clamp(34px, 5vw, 64px); margin-bottom: 22px; }
.cta .lead { margin: 0 auto 40px; }
.slogan { margin-top: 72px; font-size: 13.5px; letter-spacing: .42em; color: var(--text-2); }
.slogan span { position: relative; padding-top: 22px; }
.slogan span::before {
  content: ""; position: absolute; left: 50%; top: 0; width: 40px; height: 1px; margin-left: -20px;
  background: linear-gradient(90deg, transparent, var(--blue-2), transparent);
}

/* ---------- 页脚 ---------- */

.footer { border-top: 1px solid var(--line); padding: 64px 0 32px; background: #04060a; }
.foot { display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap; }
.foot-name { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.foot-brand p:last-child { color: var(--text-3); font-size: 14px; }
.foot-links { display: flex; gap: 72px; flex-wrap: wrap; }
.foot-links div { display: flex; flex-direction: column; gap: 10px; }
.foot-links p { font-size: 13px; color: var(--text-3); margin-bottom: 4px; letter-spacing: .06em; }
.foot-links a { font-size: 14px; color: var(--text-2); transition: color .2s; }
.foot-links a:hover { color: #fff; }
.foot-base {
  margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: var(--text-3);
}

/* ---------- 入场动效 ---------- */

.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(6px);
  transition: opacity 1s var(--ease), transform 1.1s var(--ease), filter 1s var(--ease);
}
.js .reveal.is-in { opacity: 1; transform: none; filter: none; }
.js .d1 { transition-delay: .08s; }
.js .d2 { transition-delay: .16s; }
.js .d3 { transition-delay: .24s; }
.js .d4 { transition-delay: .32s; }
.js .d5 { transition-delay: .4s; }

.js .hero-stage { opacity: 0; transform: translateY(80px); transition: opacity 1.4s var(--ease) .35s, transform 1.6s var(--ease) .35s; }
.js .hero-stage.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; margin-left: 0; }
  .nav-cta { margin-left: auto; }
  .hero-stage { width: calc(100% - 72px); }

  .proof-grid { grid-template-columns: repeat(3, 1fr); }
  .stat:nth-child(4) { border-left: 0; }
  .stat:nth-child(n+4) { border-top: 1px solid var(--line); }

  .tiers { grid-template-columns: 1fr; gap: 16px; }
  .tier-link { display: none; }

  .player { grid-template-columns: 1fr; gap: 28px; }
  .player-stage { order: -1; }
  .player-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
  .player-list button { padding: 14px 16px; }
  .pl-desc { padding-left: 0; }
  .pl-bar { margin-left: 0; }

  .split, .lab-hero { grid-template-columns: 1fr; gap: 48px; }
  .split-media { order: -1; }

  .about-grid { grid-template-columns: 1fr; }
  .honors { grid-template-columns: repeat(3, 1fr); }
  .honors li:nth-child(4) { border-left: 0; }
  .honors li:nth-child(n+4) { border-top: 1px solid var(--line); }

  .chip-a { left: -10px; }
  .chip-b { right: -10px; }
  .hero-robot { right: -10px; }
}

@media (max-width: 760px) {
  .wrap { width: calc(100% - 40px); }
  .nav-cta { display: none; }
  .nav-toggle { margin-left: auto; }

  .hero { padding-top: 120px; }
  .hero-stage { width: calc(100% - 24px); margin-top: 48px; }
  .hero-window { --rx: 8deg; margin-top: 12px; }
  .float-chip { padding: 8px 11px; font-size: 12px; }
  .float-chip b { font-size: 18px; }
  .chip-a { top: auto; bottom: -20px; left: 6px; }
  .chip-b { display: none; }
  .chip-c { display: none; }
  .pill { font-size: 12.5px; padding: 4px 12px 4px 4px; }
  .pill-tail { display: none; }
  .hero-robot { width: 96px; right: -6px; bottom: -36px; }
  .window-bar { height: 30px; gap: 8px; font-size: 11px; }
  .dots i { width: 8px; height: 8px; }
  .window-title { text-align: left; }
  .marquee { margin-top: 80px; }

  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 22px 18px; }
  .stat:nth-child(odd) { border-left: 0; }
  .stat:nth-child(4) { border-left: 1px solid var(--line); }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }

  .five { flex-direction: column; align-items: flex-start; gap: 14px; }
  .five ul { justify-content: flex-start; }

  .player-list { grid-template-columns: 1fr; }

  .bento { grid-template-columns: 1fr; }
  .tile-xl, .tile-wide { grid-column: auto; grid-row: auto; }
  .tile-wide { display: flex; }
  .tile-wide figcaption { padding: 28px 28px 22px; }
  .tile-wide .tile-shot { margin: auto 0 0 28px; }

  .seg { flex-direction: column; border-radius: 20px; width: 100%; }
  .seg button { text-align: center; }
  .seg-thumb { border-radius: 16px; right: 5px; }

  .spec dd b { font-size: 24px; }
  .rail { grid-auto-columns: 72%; margin-top: 48px; }

  .robot { min-height: 0; padding: 0 0 80px; display: block; }
  .robot-media { position: relative; aspect-ratio: 16 / 10; }
  .robot-shade { background: linear-gradient(180deg, var(--bg) 0%, transparent 20%, transparent 70%, var(--bg) 100%); }
  .robot-copy { margin-top: -20px; }
  .sensors { grid-template-columns: 1fr 1fr; }

  .tracks, .desks { grid-template-columns: 1fr; }
  .track { padding: 28px 22px; }
  .majors { flex-direction: column; align-items: flex-start; gap: 14px; padding: 22px; }
  .track-hero { height: 200px; }
  .track-labs { grid-template-columns: repeat(2, 1fr); }

  .steps { grid-template-columns: 1fr; gap: 28px; }
  .steps::before { left: 23px; right: auto; top: 0; bottom: 0; width: 1px; height: auto; background: var(--line-2); }
  .steps li { padding: 0 0 0 70px; }
  .steps span { position: absolute; left: 0; top: 0; margin: 0; }
  .desks { margin-top: 64px; }

  .about-photo { min-height: 320px; }
  .about-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .astat { padding: 20px 18px; }
  .honors { grid-template-columns: repeat(2, 1fr); }
  .honors li:nth-child(n) { border-left: 0; border-top: 1px solid var(--line); }
  .honors li:nth-child(even) { border-left: 1px solid var(--line); }
  .honors li:nth-child(-n+2) { border-top: 0; }

  .foot-links { gap: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
  html { scroll-behavior: auto; }
  .js .reveal, .js .hero-stage { opacity: 1; transform: none; filter: none; }
  .hero-window { transform: none; }
}