:root{
  --bg-dark:#07070C; --bg-dark2:#0B0B13; --bg-light:#F5F7FA; --bg-white:#FFFFFF;
  --tx-d:#FFFFFF; --tx-d-sub:#8A939E; --tx-l:#101318; --tx-l-sub:#5F6873;
  --blue:#FF571A; --green:#22D3EE; --card-d:#111120; --line-d:rgba(255,255,255,.08); --line-l:#E6EAF0;
  --r:14px; --nav-h:64px;
  --font-sans:"Inter","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Noto Sans SC",sans-serif;
  /* 与锻造AI学院同一套品牌渐变 */
  --grad-brand:linear-gradient(120deg,#ff4405 0%,#ff571a 40%,#ff9a3d 100%);
  --brand-ink:#FFC2A3;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--bg-dark);color:var(--tx-d);line-height:1.7;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
button{font-family:inherit;cursor:pointer;border:none}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);background:rgba(7,7,12,.72);border-bottom:1px solid var(--line-d)}
.nav-in{max-width:1280px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;gap:22px}
.logo{display:flex;align-items:baseline;gap:10px;cursor:pointer;flex-shrink:0}
.logo b{font-size:19px;letter-spacing:.5px}
.logo b i{color:var(--blue);font-style:normal}
.logo span{font-size:11.5px;color:var(--tx-d-sub)}
.nav-links{display:flex;gap:2px;flex:1;justify-content:center}
.nav-links a{font-size:13.5px;color:var(--tx-d-sub);padding:8px 11px;border-radius:8px;transition:.3s;cursor:pointer;white-space:nowrap}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.06)}
.nav-links a.on{color:#fff}
.nav-links a.hot{color:#9FF0FF}
.nav-links a.hot::after{content:" ●";font-size:8px;color:var(--green);vertical-align:2px}
.btn{display:inline-block;padding:11px 22px;border-radius:999px;font-size:14.5px;font-weight:600;transition:all .35s;cursor:pointer;text-align:center}
.btn-p{background:var(--grad-brand);background-size:160% 160%;color:#fff;box-shadow:0 8px 24px -8px rgba(255,87,26,.6),inset 0 1px 0 rgba(255,255,255,.25)}
.btn-p:hover{background-position:100% 0;transform:translateY(-2px);box-shadow:0 16px 40px -10px rgba(255,87,26,.75),inset 0 1px 0 rgba(255,255,255,.3)}
.btn-g{background:var(--green);color:#062A33;font-weight:650}
.btn-g:hover{background:#0FB9D4;transform:translateY(-1px);box-shadow:0 8px 24px rgba(34,211,238,.3)}
.btn-o{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.25)}
.btn-o:hover{border-color:#fff;background:rgba(255,255,255,.06)}
.btn-ol{background:transparent;color:var(--tx-l);border:1px solid #C9D2DE}
.btn-ol:hover{border-color:var(--blue);color:var(--blue)}
.nav-cta{padding:9px 16px;font-size:13px;flex-shrink:0}
.burger{display:none;background:none;color:#fff;font-size:22px;flex-shrink:0}
.m-menu{display:none;position:fixed;top:var(--nav-h);left:0;right:0;z-index:99;background:rgba(7,7,12,.97);backdrop-filter:blur(16px);border-bottom:1px solid var(--line-d);padding:12px 24px 20px;max-height:75vh;overflow:auto}
.m-menu a{display:block;padding:13px 8px;font-size:15px;color:#dfe5ec;border-bottom:1px solid var(--line-d);cursor:pointer}
.page{display:none}
.page.show{display:block}
section{padding:96px 0}
.dark{background:var(--bg-dark);color:var(--tx-d)}
.dark2{background:var(--bg-dark2);color:var(--tx-d)}
.light{background:var(--bg-light);color:var(--tx-l)}
.white{background:var(--bg-white);color:var(--tx-l)}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;letter-spacing:2px;color:var(--blue);text-transform:uppercase;margin-bottom:18px}
.kicker::before{content:"";width:22px;height:1.5px;background:var(--blue)}
h1{font-size:52px;line-height:1.22;font-weight:700;letter-spacing:-.5px}
h2{font-size:36px;line-height:1.3;font-weight:700;letter-spacing:-.3px;margin-bottom:14px}
h3{font-size:19px;font-weight:700}
.sub{font-size:17px;color:var(--tx-d-sub);max-width:660px}
.light .sub,.white .sub{color:var(--tx-l-sub)}
.center{text-align:center}
.center .sub{margin:0 auto}
.hero{min-height:92vh;display:flex;align-items:center;position:relative;overflow:hidden;padding-top:var(--nav-h)}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 60% 45% at 50% 0%,rgba(255,87,26,.14),transparent 65%),radial-gradient(ellipse 40% 35% at 82% 85%,rgba(34,211,238,.05),transparent 60%)}
.hero-in{position:relative;text-align:center;max-width:880px;margin:0 auto;padding:70px 24px}
.hero-badge{display:inline-block;padding:7px 16px;border:1px solid rgba(255,87,26,.4);border-radius:999px;font-size:13px;color:#FFD0B8;margin-bottom:30px;background:rgba(255,87,26,.08)}
.hero p.lead{font-size:19px;color:#B7C0CB;margin:26px auto 14px;max-width:640px}
.hero p.note{font-size:14.5px;color:var(--tx-d-sub);max-width:660px;margin:0 auto 40px}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.chips{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:52px}
.chip{font-size:13px;color:#AEB7C2;padding:8px 16px;border:1px solid var(--line-d);border-radius:999px;background:rgba(255,255,255,.03)}
.chip::before{content:"● ";color:var(--green);font-size:9px;vertical-align:1.5px}
.pulse{width:9px;height:9px;border-radius:50%;background:var(--green);display:inline-block;animation:pu 2.6s ease-in-out infinite}
@keyframes pu{0%,100%{opacity:.5;transform:scale(.9)}50%{opacity:1;transform:scale(1.15)}}
.grid{display:grid;gap:20px;margin-top:52px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{border-radius:var(--r);padding:30px 28px;transition:all .4s}
.dark .card,.dark2 .card{background:var(--card-d);border:1px solid var(--line-d)}
.dark .card:hover,.dark2 .card:hover{border-color:rgba(255,87,26,.45);transform:translateY(-3px);box-shadow:0 16px 40px rgba(0,0,0,.5)}
.light .card,.white .card{background:#fff;border:1px solid var(--line-l);box-shadow:0 1px 3px rgba(16,19,24,.05)}
.light .card:hover,.white .card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(16,19,24,.09);border-color:#FBD9C9}
.card .ic{width:42px;height:42px;border-radius:11px;background:rgba(255,87,26,.12);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:700;margin-bottom:18px}
.card h3{margin-bottom:10px}
.card p{font-size:14px;color:var(--tx-d-sub)}
.light .card p,.white .card p{color:var(--tx-l-sub)}
.card .link{display:inline-block;margin-top:16px;font-size:13.5px;font-weight:600;color:var(--blue);cursor:pointer}
.card .link::after{content:" →";transition:.3s}
.card .link:hover::after{margin-left:4px}
/* dual channel */
.duo{display:grid;grid-template-columns:1.35fr 1fr;gap:22px;margin-top:52px}
.duo-card{border-radius:18px;padding:40px 38px;position:relative;overflow:hidden;transition:all .4s}
.duo-online{background:linear-gradient(135deg,#06212A,#111120 70%);border:1.5px solid rgba(34,211,238,.4)}
.duo-online:hover{border-color:var(--green);transform:translateY(-3px);box-shadow:0 20px 50px rgba(34,211,238,.12)}
.duo-off{background:var(--card-d);border:1.5px solid rgba(255,87,26,.35)}
.duo-off:hover{border-color:var(--blue);transform:translateY(-3px)}
.duo-tag{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:1px;padding:5px 12px;border-radius:999px;margin-bottom:18px}
.duo-online .duo-tag{background:rgba(34,211,238,.15);color:var(--green)}
.duo-off .duo-tag{background:rgba(255,87,26,.15);color:var(--blue)}
.duo-card h3{font-size:26px;margin-bottom:10px}
.duo-card p{font-size:14px;color:var(--tx-d-sub);margin-bottom:8px}
.duo-feats{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0 24px}
.duo-feats span{font-size:12px;padding:5px 12px;border-radius:999px;border:1px solid var(--line-d);color:#AEB7C2}
.steps3{display:flex;gap:10px;margin:18px 0 24px;flex-wrap:wrap}
.steps3 div{flex:1;min-width:120px;border:1px dashed rgba(34,211,238,.35);border-radius:10px;padding:12px 10px;text-align:center;font-size:12.5px;color:#CDEFF7}
.steps3 b{display:block;color:var(--green);font-size:14px;margin-bottom:3px}
.engine-wrap{margin-top:56px}
.engines{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.engine{border-radius:var(--r);padding:34px 30px;text-align:center;border:1px solid rgba(255,87,26,.35);background:linear-gradient(180deg,rgba(255,87,26,.09),rgba(255,87,26,.02))}
.engine.g{border-color:rgba(34,211,238,.3);background:linear-gradient(180deg,rgba(34,211,238,.07),rgba(34,211,238,.015))}
.engine .tag{font-size:13px;font-weight:600;color:var(--blue);letter-spacing:1px}
.engine .big{font-size:40px;font-weight:800;letter-spacing:8px;margin:10px 0 6px}
.engine .exp{font-size:13px;color:var(--tx-d-sub)}
.chassis{margin-top:20px;border:1px solid rgba(255,255,255,.14);border-radius:var(--r);padding:22px 30px;display:flex;align-items:center;justify-content:center;gap:22px;flex-wrap:wrap;background:rgba(255,255,255,.025)}
.chassis b{font-size:20px;letter-spacing:5px}
.chassis span{font-size:13px;color:var(--tx-d-sub)}
/* stages */
.stages{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:52px}
.stage{position:relative;background:#fff;border:1px solid var(--line-l);border-radius:var(--r);padding:28px 24px}
.stage .no{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:1px}
.stage h3{margin:8px 0 10px;font-size:21px}
.stage p{font-size:13.5px;color:var(--tx-l-sub)}
.stage::after{content:"→";position:absolute;right:-14px;top:44%;color:#B9C4D4;font-size:18px;z-index:2}
.stage:last-child::after{display:none}
.strip{margin-top:52px;border-radius:var(--r);padding:26px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.light .strip,.white .strip{background:linear-gradient(90deg,#FFF1EA,#F1FBFE);border:1px solid #FBDFD2}
.strip h3{font-size:17px}
.strip p{font-size:13.5px;color:var(--tx-l-sub);margin-top:4px}
.rights{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.right-tag{font-size:12.5px;padding:7px 14px;border-radius:999px;background:#EEF3FA;border:1px solid var(--line-l);color:var(--tx-l-sub)}
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:48px}
.step{border:1px solid var(--line-d);border-radius:12px;padding:20px 14px;text-align:center;background:var(--card-d)}
.step .n{width:30px;height:30px;margin:0 auto 10px;border-radius:50%;background:rgba(255,87,26,.15);color:var(--blue);font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}
.step h4{font-size:14.5px;margin-bottom:4px}
.step p{font-size:11.5px;color:var(--tx-d-sub);line-height:1.5}
.case .meta{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.case .meta span{font-size:11.5px;padding:4px 11px;border-radius:999px;background:#EEF3FA;color:var(--tx-l-sub)}
.case .quote{font-size:13.5px;color:var(--tx-l-sub);border-left:3px solid var(--blue);padding-left:12px;margin-top:14px;font-style:italic}
.verify{font-size:12.5px;color:var(--tx-l-sub);margin-top:34px;text-align:center}
.verify b{color:#12626F}
/* schedule table */
.sched{margin-top:48px;border:1px solid var(--line-l);border-radius:var(--r);overflow:hidden;background:#fff}
.sched .row{display:grid;grid-template-columns:150px 1fr;border-bottom:1px solid var(--line-l)}
.sched .row:last-child{border-bottom:none}
.sched .row .t{background:#F0F4FA;padding:16px 18px;font-weight:700;font-size:14px;color:var(--blue)}
.sched .row .c{padding:16px 20px;font-size:13.5px;color:var(--tx-l-sub)}
/* weekly */
.week{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:48px}
.final{padding:110px 0;text-align:center;position:relative;overflow:hidden}
.final::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 55% 60% at 50% 100%,rgba(255,87,26,.15),transparent 65%)}
.final>*{position:relative}
footer{background:var(--bg-dark);border-top:1px solid var(--line-d);padding:52px 0 40px;color:var(--tx-d-sub);font-size:13px}
.foot{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.foot .cols{display:flex;gap:56px;flex-wrap:wrap}
.foot h5{color:#fff;font-size:13.5px;margin-bottom:12px}
.foot a{display:block;padding:4px 0;color:var(--tx-d-sub);cursor:pointer;transition:.3s}
.foot a:hover{color:#fff}
.foot-note{margin-top:36px;padding-top:22px;border-top:1px solid var(--line-d);font-size:12px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.modal-bg{display:none;position:fixed;inset:0;z-index:200;background:rgba(4,4,8,.7);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px}
.modal-bg.open{display:flex}
.modal{background:#fff;color:var(--tx-l);border-radius:18px;max-width:460px;width:100%;padding:36px 34px;position:relative;animation:mi .4s cubic-bezier(.2,.8,.3,1)}
@keyframes mi{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}
.modal h3{font-size:21px;margin-bottom:8px}
.modal .mp{font-size:13.5px;color:var(--tx-l-sub);margin-bottom:20px}
.modal input,.modal select,.modal textarea{width:100%;padding:12px 14px;border:1px solid #D6DEE9;border-radius:10px;font-size:14px;font-family:inherit;margin-bottom:12px;outline:none;transition:.3s;background:#FAFBFD}
.modal input:focus,.modal select:focus,.modal textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(255,87,26,.15)}
.modal .x{position:absolute;top:16px;right:18px;background:none;font-size:20px;color:#9AA5B1}
.modal .ok{display:none;text-align:center;padding:26px 0 10px}
.modal .ok .tick{width:54px;height:54px;margin:0 auto 16px;border-radius:50%;background:#E8FBFF;color:#0E7C90;font-size:26px;display:flex;align-items:center;justify-content:center}
.rv{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.rv.in{opacity:1;transform:none}
.kb-cat{display:flex;gap:10px;flex-wrap:wrap;margin:40px 0 8px}
.kb-cat button{padding:9px 18px;border-radius:999px;border:1px solid var(--line-l);background:#fff;font-size:13.5px;color:var(--tx-l-sub);transition:.3s}
.kb-cat button.on,.kb-cat button:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.kb-item{padding:22px 4px;border-bottom:1px solid var(--line-l);display:flex;justify-content:space-between;gap:18px;align-items:baseline;cursor:pointer;transition:.3s}
.kb-item:hover h4{color:var(--blue)}
.kb-item h4{font-size:16px;transition:.3s}
.kb-item p{font-size:13px;color:var(--tx-l-sub);margin-top:4px}
.kb-item span{font-size:12px;color:#93A0AF;white-space:nowrap}
@media(max-width:960px){
  .nav-links{display:none}.burger{display:block;margin-left:auto}.nav-cta{display:none}
  h1{font-size:34px}h2{font-size:27px}
  .g3,.g4,.g2,.duo,.week{grid-template-columns:1fr}
  .stages{grid-template-columns:1fr}.stage::after{display:none}
  .steps{grid-template-columns:repeat(2,1fr)}
  section{padding:64px 0}
  .hero-in{padding:56px 20px}
  .sched .row{grid-template-columns:1fr}.sched .row .t{padding:10px 18px}
}

/* academy overlay */
@media(max-width:960px){.acad-bar .tip{display:none}.acad-tabs button{padding:7px 8px;font-size:12px}}

/* ===== 以下为合并时补充: 窄屏断点 + 动效降级, 与锻造AI学院对齐 ===== */
@media (max-width:560px){
  h1{font-size:34px}
  h2{font-size:26px}
  section{padding:64px 0}
  .wrap{padding:0 18px}
  .hero-in{padding:52px 18px}
  .hero p.lead{font-size:16.5px}
  .sub{font-size:15.5px}
  .btn{padding:10px 18px;font-size:14px}
  .hero-btns{flex-direction:column;align-items:stretch}
  .hero-btns .btn{width:100%}
  .chips{gap:8px;margin-top:36px}
  .chip{font-size:12px;padding:6px 12px}
  .modal{padding:22px 18px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important}
  .rv{opacity:1!important;transform:none!important}
}

/* ===== 浅色区主色降深 =====
   #FF571A 在 #F5F7FA 上只有 2.95:1, 连大字标准都不到。
   利用 CSS 变量继承, 在浅色区重定义一次 --blue 即可覆盖所有 var(--blue) 用法,
   不必逐条改规则。#C93807 在 #F5F7FA 上 4.83:1 / 白底 5.18:1, 达 AA。 */
.light, .white { --blue: #C93807; }

/* ===== 法律文本页 (隐私政策 / 服务条款) ===== */
.legal-hero{padding:calc(var(--nav-h) + 72px) 0 40px;background:var(--bg-dark)}
.legal-hero h1{font-size:40px}
.legal-meta{margin-top:18px;font-size:14px;color:var(--tx-d-sub);display:flex;gap:22px;flex-wrap:wrap}
.legal-body{background:var(--bg-white);color:var(--tx-l);padding:64px 0 88px}
.legal-doc{max-width:840px;margin:0 auto}
.legal-doc>p,.legal-doc li{font-size:15.5px;line-height:1.85;color:#3A424E}
.legal-doc h2{font-size:22px;margin:44px 0 14px;padding-top:12px;border-top:1px solid var(--line-l);color:var(--tx-l)}
.legal-doc h2:first-of-type{border-top:none;padding-top:0;margin-top:8px}
.legal-doc h3{font-size:17px;margin:26px 0 10px;color:var(--tx-l)}
.legal-doc ul,.legal-doc ol{margin:12px 0 12px 22px}
.legal-doc li{margin:7px 0}
.legal-doc strong{color:var(--tx-l);font-weight:650}
.legal-doc a{color:#C93807;text-decoration:underline;text-underline-offset:3px}
.legal-toc{background:#FFF6F1;border:1px solid #FBDFD2;border-radius:var(--r);padding:20px 24px;margin:28px 0 8px}
.legal-toc h4{font-size:14px;letter-spacing:1px;color:#C93807;margin-bottom:12px;text-transform:uppercase}
.legal-toc ol{margin:0 0 0 20px;columns:2;column-gap:32px}
.legal-toc li{font-size:14.5px;margin:5px 0}
.legal-note{background:#FDF7F7;border:1px solid #F3D2D2;border-radius:var(--r);padding:18px 22px;margin:28px 0;font-size:14.5px;line-height:1.8;color:#7A3A3A}
.legal-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14.5px}
.legal-table th,.legal-table td{border:1px solid var(--line-l);padding:10px 12px;text-align:left;vertical-align:top}
.legal-table th{background:#F0F4FA;font-weight:650;color:var(--tx-l);white-space:nowrap}
@media (max-width:560px){
  .legal-hero h1{font-size:28px}
  .legal-toc ol{columns:1}
  .legal-table{display:block;overflow-x:auto}
}