/* ==========================================================
   尚夏文AI 官网 · 全站样式
   ========================================================== */
:root{
  --navy:#0b1b33;
  --navy-2:#10233f;
  --navy-3:#16304f;
  --teal:#00b39f;
  --teal-2:#26d0bb;
  --gold:#d4b06a;
  --ink:#0d1a2b;
  --text:#1c2b40;
  --muted:#5a6b82;
  --line:#e3e9f1;
  --bg:#ffffff;
  --bg-soft:#f5f8fc;
  --radius:16px;
  --max:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.nav .brand img{height:38px}
.nav ul{display:flex;gap:34px;list-style:none;font-size:15px;font-weight:500}
.nav ul a{color:#33465e;position:relative;padding:6px 0;transition:.2s}
.nav ul a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--teal);transition:.25s}
.nav ul a:hover{color:var(--navy)}
.nav ul a:hover::after{width:100%}
.nav ul a.active{color:var(--teal);font-weight:700}
.nav ul a.active::after{width:100%}
.nav .cta{
  background:var(--navy);color:#fff;padding:10px 22px;border-radius:999px;font-size:14px;font-weight:600;
  transition:.25s;white-space:nowrap;
}
.nav .cta:hover{background:var(--teal);transform:translateY(-1px)}
.menu-btn{display:none;background:none;border:0;font-size:24px;color:var(--navy);cursor:pointer}

/* ---------- 内页横幅 ---------- */
.page-hero{
  background:
    radial-gradient(800px 420px at 80% 0%, rgba(0,179,159,.20), transparent 62%),
    linear-gradient(150deg,#08152a 0%,#0d2141 55%,#0a1a33 100%);
  color:#fff;padding:74px 0 66px;position:relative;overflow:hidden;
}
.page-hero::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:64px 64px;mask-image:radial-gradient(circle at 50% 40%,#000,transparent 78%);
}
.page-hero .wrap{position:relative;z-index:2}
.page-hero .en{font-size:12px;letter-spacing:.34em;color:var(--teal-2);font-weight:600;margin-bottom:16px}
.page-hero h1{font-size:clamp(30px,4vw,46px);font-weight:800;letter-spacing:-.5px;line-height:1.3}
.page-hero p{color:#a9bdd6;margin-top:18px;font-size:16.5px;max-width:42em;line-height:1.85}
.crumb{font-size:13px;color:#7e93b0;margin-top:26px}
.crumb a:hover{color:var(--teal-2)}
.crumb span{color:#4c6380;margin:0 8px}

/* ---------- 通用区块 ---------- */
section{padding:88px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 56px}
.sec-head.left{text-align:left;margin-left:0}
.sec-head .en{font-size:12.5px;letter-spacing:.34em;color:var(--teal);font-weight:600;margin-bottom:14px}
.sec-head h2{font-size:clamp(25px,3.2vw,36px);font-weight:800;color:var(--navy);letter-spacing:-.4px;line-height:1.35}
.sec-head p{color:var(--muted);margin-top:16px;font-size:16px}
.sec-head .divider{width:52px;height:3px;background:var(--gold);border-radius:2px;margin:22px auto 0}
.sec-head.left .divider{margin-left:0}
.soft{background:var(--bg-soft)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:15px 32px;border-radius:999px;
  font-size:15.5px;font-weight:600;transition:.25s;border:1px solid transparent;cursor:pointer;
}
.btn-primary{background:linear-gradient(100deg,var(--teal),#12c7ae);color:#04211d;box-shadow:0 12px 30px -12px rgba(0,179,159,.65)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px -14px rgba(0,179,159,.8)}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--teal);transform:translateY(-2px);color:#04211d}
.btn-ghost{border-color:rgba(255,255,255,.28);color:#e6eefa}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.5)}
.btn-outline{border-color:var(--line);color:var(--navy);background:#fff}
.btn-outline:hover{border-color:var(--teal);color:var(--teal)}

/* ---------- 首页 HERO ---------- */
.hero{
  background:
    radial-gradient(900px 480px at 78% 8%, rgba(0,179,159,.22), transparent 62%),
    radial-gradient(760px 520px at 12% 92%, rgba(43,90,168,.28), transparent 60%),
    linear-gradient(150deg,#08152a 0%,#0d2141 52%,#0a1a33 100%);
  color:#fff;padding:100px 0 110px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;mask-image:radial-gradient(circle at 50% 40%,#000,transparent 76%);
}
.hero .wrap{position:relative;z-index:2}
.hero .tag{
  display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.16em;
  color:var(--teal-2);border:1px solid rgba(38,208,187,.35);border-radius:999px;padding:7px 18px;
  background:rgba(0,179,159,.08);margin-bottom:30px;
}
.hero h1{font-size:clamp(34px,5.2vw,58px);line-height:1.24;font-weight:800;letter-spacing:-.5px;max-width:19em}
.hero h1 .hl{
  background:linear-gradient(100deg,#26d0bb,#7ee7d6 45%,#d4b06a);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{font-size:clamp(16px,1.7vw,19px);color:#a9bdd6;margin-top:26px;max-width:44em;line-height:1.9}
.hero .btns{display:flex;gap:16px;margin-top:44px;flex-wrap:wrap}
.hero .meta{
  display:flex;gap:44px;flex-wrap:wrap;margin-top:60px;padding-top:34px;
  border-top:1px solid rgba(255,255,255,.12);position:relative;z-index:2;
}
.hero .meta div span{display:block;font-size:26px;font-weight:800;color:var(--teal-2);letter-spacing:-.5px}
.hero .meta div{font-size:14px;color:#8fa6c4}

/* ---------- 痛点 ---------- */
.pains{display:grid;gap:20px;max-width:940px;margin:0 auto}
.pain{
  display:flex;align-items:center;gap:28px;background:#fff;border:1px solid var(--line);
  border-left:4px solid var(--teal);border-radius:14px;padding:26px 32px;transition:.28s;
}
.pain:hover{transform:translateX(6px);box-shadow:0 16px 38px -20px rgba(13,33,65,.35);border-left-color:var(--navy)}
.pain .no{font-size:32px;font-weight:800;color:#cbd7e6;font-variant-numeric:tabular-nums;min-width:64px}
.pain .txt{font-size:17px;color:var(--text)}
.pain .txt b{color:var(--navy)}
.pain .txt .g{color:var(--teal);font-weight:700}

/* ---------- 五步 ---------- */
.steps{max-width:920px;margin:0 auto;position:relative}
.steps::before{
  content:"";position:absolute;left:29px;top:16px;bottom:16px;width:2px;
  background:linear-gradient(180deg,var(--teal),rgba(0,179,159,.15));
}
.step{display:flex;gap:28px;padding:20px 0;position:relative}
.step .dot{
  flex:0 0 60px;width:60px;height:60px;border-radius:50%;
  background:linear-gradient(140deg,#00b39f,#0b7f8e);color:#fff;font-weight:800;font-size:20px;
  display:flex;align-items:center;justify-content:center;position:relative;z-index:2;
  box-shadow:0 0 0 8px #fff,0 10px 24px -12px rgba(0,179,159,.8);
}
.soft .step .dot{box-shadow:0 0 0 8px var(--bg-soft),0 10px 24px -12px rgba(0,179,159,.8)}
.step .body{padding-top:5px}
.step h3{font-size:20px;color:var(--navy);font-weight:700;margin-bottom:6px}
.step p{color:var(--muted);font-size:15.5px}

/* ---------- 案例 ---------- */
.cases{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.case{
  background:linear-gradient(160deg,#0d2141,#0a1a33);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--radius);padding:34px 32px;color:#dbe6f5;transition:.3s;position:relative;overflow:hidden;
}
.case::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--teal),var(--gold));opacity:0;transition:.3s;
}
.case:hover{transform:translateY(-6px);border-color:rgba(0,179,159,.45);box-shadow:0 24px 50px -26px rgba(0,179,159,.6)}
.case:hover::before{opacity:1}
.case .chip{
  display:inline-block;font-size:12.5px;font-weight:600;color:#04211d;
  background:linear-gradient(100deg,#26d0bb,#00b39f);border-radius:999px;padding:5px 14px;margin-bottom:18px;
}
.case h3{font-size:20px;color:#fff;font-weight:700;margin-bottom:12px}
.case p{font-size:15px;color:#9fb3cd;line-height:1.85}
.case p .g{color:var(--gold);font-weight:700}
.case .metric{
  margin-top:22px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);
  font-size:14px;color:var(--teal-2);font-weight:600;
}
/* 案例详情版 */
.case-detail{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:0;overflow:hidden;transition:.3s;display:flex;flex-direction:column;
}
.case-detail:hover{transform:translateY(-5px);box-shadow:0 24px 50px -28px rgba(13,33,65,.45);border-color:#cfe0f2}
.case-detail .head{
  background:linear-gradient(150deg,#0d2141,#16304f);color:#fff;padding:26px 28px;
}
.case-detail .head .chip{
  display:inline-block;font-size:12px;font-weight:600;color:#04211d;
  background:linear-gradient(100deg,#26d0bb,#00b39f);border-radius:999px;padding:4px 12px;margin-bottom:14px;
}
.case-detail .head h3{font-size:19px;font-weight:700}
.case-detail .body{padding:26px 28px 30px;flex:1;display:flex;flex-direction:column}
.case-detail .row{margin-bottom:18px}
.case-detail .row:last-of-type{margin-bottom:0}
.case-detail .label{
  font-size:11.5px;font-weight:700;letter-spacing:.18em;color:var(--teal);
  margin-bottom:6px;
}
.case-detail .row p{font-size:14.5px;color:var(--text);line-height:1.8}
.case-detail .result{
  margin-top:auto;padding-top:18px;border-top:1px dashed var(--line);
  font-size:14px;font-weight:700;color:var(--navy);
}
.case-detail .result span{color:var(--teal)}

/* ---------- 团队 ---------- */
.team{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:24px}
.member{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 28px;
  text-align:center;transition:.3s;
}
.member:hover{transform:translateY(-6px);box-shadow:0 22px 46px -26px rgba(13,33,65,.4);border-color:#cfe0f2}
.member .avatar{
  width:124px;height:124px;border-radius:50%;margin:0 auto 22px;overflow:hidden;
  border:3px solid transparent;
  background:linear-gradient(#fff,#fff) padding-box,linear-gradient(140deg,var(--gold),var(--teal)) border-box;
}
.member .avatar img{width:100%;height:100%;object-fit:cover}
.member h3{font-size:21px;color:var(--navy);font-weight:800;letter-spacing:1px}
.member .en{font-size:9.5px;letter-spacing:.22em;color:var(--gold);font-weight:600;margin-top:5px}
.member .role{font-size:14px;color:var(--teal);font-weight:600;margin:10px 0 16px}
.member .bio{font-size:14.5px;color:var(--muted);line-height:1.85;text-align:left}
.member .bio li{
  list-style:none;padding-left:20px;position:relative;margin-bottom:9px;
}
.member .bio li::before{content:"›";position:absolute;left:4px;color:var(--teal);font-weight:800;font-size:16px}
.member .slogan{
  margin-top:18px;padding-top:16px;border-top:1px dashed var(--line);
  font-size:14.5px;font-weight:700;color:var(--navy);
}
.member .slogan::before{content:"「";color:var(--gold)}
.member .slogan::after{content:"」";color:var(--gold)}

/* ---------- 服务 ---------- */
.svc{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.svc-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:38px 32px;transition:.3s;
}
.svc-card:hover{border-color:var(--teal);box-shadow:0 22px 46px -26px rgba(0,179,159,.5);transform:translateY(-4px)}
.svc-card .ico{
  width:52px;height:52px;border-radius:13px;background:linear-gradient(140deg,#e8f8f6,#d6f2ee);
  display:flex;align-items:center;justify-content:center;margin-bottom:22px;font-size:24px;color:var(--teal);
}
.svc-card h3{font-size:19px;color:var(--navy);font-weight:700;margin-bottom:12px}
.svc-card p{font-size:15px;color:var(--muted);line-height:1.85}
.svc-card ul{margin-top:16px;list-style:none;font-size:14.5px;color:var(--text)}
.svc-card ul li{padding-left:22px;position:relative;margin-bottom:9px}
.svc-card ul li::before{content:"›";position:absolute;left:4px;color:var(--teal);font-weight:800;font-size:17px}
/* 服务流程 */
.flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px;margin-top:56px}
.flow-item{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 24px;position:relative;
}
.flow-item .n{
  font-size:12px;font-weight:800;letter-spacing:.16em;color:var(--teal);margin-bottom:10px;
}
.flow-item h4{font-size:16.5px;color:var(--navy);font-weight:700;margin-bottom:8px}
.flow-item p{font-size:14px;color:var(--muted);line-height:1.75}

/* ---------- 联系 ---------- */
.contact-block{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:start}
.qrbox{display:flex;gap:40px;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-item .card{
  background:#fff;border-radius:18px;padding:14px;width:180px;height:180px;margin:0 auto 18px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 18px 40px -22px rgba(13,33,65,.3);border:1px solid var(--line);
}
.qr-item .card img{width:152px;height:152px;object-fit:contain}
.qr-item h4{font-size:17px;font-weight:700;color:var(--navy)}
.qr-item span{display:block;font-size:13.5px;color:var(--muted);margin-top:5px}

/* ---------- 表单 ---------- */
.form-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:40px 38px;
  box-shadow:0 20px 50px -34px rgba(13,33,65,.35);
}
.form-card h3{font-size:22px;color:var(--navy);font-weight:800;margin-bottom:8px}
.form-card .sub{font-size:14px;color:var(--muted);margin-bottom:28px}
.field{margin-bottom:20px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--text);margin-bottom:8px}
.field label .req{color:#e05555;margin-left:3px}
.field input,.field textarea{
  width:100%;border:1px solid var(--line);border-radius:10px;padding:13px 15px;
  font-size:15px;font-family:inherit;color:var(--text);background:#fbfcfe;transition:.2s;
}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--teal);background:#fff;box-shadow:0 0 0 3px rgba(0,179,159,.12);
}
.field textarea{resize:vertical;min-height:110px;line-height:1.7}
.field .err{font-size:12.5px;color:#e05555;margin-top:6px;display:none}
.field.invalid input,.field.invalid textarea{border-color:#e05555;background:#fff8f8}
.field.invalid .err{display:block}
.agree{display:flex;align-items:flex-start;gap:9px;font-size:13px;color:var(--muted);margin-bottom:22px;line-height:1.7}
.agree input{margin-top:4px;width:15px;height:15px;accent-color:var(--teal);flex:0 0 auto}
.agree a{color:var(--teal);text-decoration:underline}
.form-card .btn{width:100%;justify-content:center}
.form-ok{
  display:none;text-align:center;padding:34px 10px;
}
.form-ok .ic{
  width:62px;height:62px;border-radius:50%;background:linear-gradient(140deg,#00b39f,#12c7ae);
  color:#fff;font-size:30px;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;
}
.form-ok h4{font-size:20px;color:var(--navy);font-weight:800;margin-bottom:10px}
.form-ok p{font-size:14.5px;color:var(--muted);line-height:1.8}

/* ---------- 长文排版（隐私政策等） ---------- */
.prose{max-width:820px;margin:0 auto}
.prose .updated{font-size:13px;color:var(--muted);margin-bottom:26px}
.prose p{font-size:15.5px;line-height:1.95;color:var(--text);margin-bottom:16px}
.prose h2{font-size:19px;font-weight:800;color:var(--navy);margin:38px 0 14px;padding-left:13px;position:relative;line-height:1.5}
.prose h2::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:linear-gradient(180deg,var(--teal),#12c7ae)}
.prose ul{margin:0 0 18px;padding-left:0;list-style:none}
.prose ul li{font-size:15.5px;line-height:1.95;color:var(--text);padding-left:20px;position:relative;margin-bottom:8px}
.prose ul li::before{content:"";position:absolute;left:4px;top:12px;width:6px;height:6px;border-radius:50%;background:var(--teal);opacity:.7}
.prose strong{color:var(--navy)}
.prose a{color:var(--teal);text-decoration:underline}
.prose table{width:100%;border-collapse:collapse;margin:6px 0 20px;font-size:14.5px}
.prose table th,.prose table td{border:1px solid #e2e8f0;padding:11px 14px;text-align:left;line-height:1.7}
.prose table th{background:#f6f9fc;font-weight:700;color:var(--navy);white-space:nowrap}
.prose table td{color:var(--text)}
.prose .back{margin-top:38px;font-size:15px}

/* ---------- 联系信息卡 ---------- */
.info-list{display:grid;gap:16px;margin-top:36px}
.info-item{display:flex;gap:16px;align-items:flex-start}
.info-item .k{font-size:13px;font-weight:700;color:var(--teal);letter-spacing:.1em;min-width:70px}
.info-item .v{font-size:15px;color:var(--text);line-height:1.7}

/* ---------- CTA 条 ---------- */
.cta-bar{
  background:linear-gradient(150deg,#08152a,#0d2141 55%,#0a1a33);
  color:#fff;padding:64px 0;text-align:center;position:relative;overflow:hidden;
}
.cta-bar::before{
  content:"";position:absolute;width:560px;height:560px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,179,159,.18),transparent 66%);
  top:-260px;right:-120px;
}
.cta-bar .wrap{position:relative;z-index:2}
.cta-bar h2{font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.3px}
.cta-bar p{color:#9fb3cd;margin-top:14px;font-size:16px}
.cta-bar .btns{display:flex;gap:16px;justify-content:center;margin-top:32px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
footer{background:#061124;color:#7e93b0;padding:52px 0 36px;font-size:14px}
footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:44px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.07)}
footer .fbrand img{height:34px;margin-bottom:16px;filter:brightness(0) invert(1);opacity:.9}
footer .fbrand div{line-height:1.9;font-size:13.5px}
footer h5{color:#c8d6e6;font-size:14px;font-weight:700;margin-bottom:16px}
footer ul{list-style:none;display:grid;gap:11px;font-size:13.5px}
footer ul a:hover{color:var(--teal-2)}
footer .en{font-size:11.5px;letter-spacing:.2em;color:#5b7a9e;margin-top:8px}
footer .btm{padding-top:24px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12.5px;color:#5b7a9e}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .nav ul{display:none}
  .menu-btn{display:block;order:3}
  .nav .cta{display:none}
  .nav ul.open{
    display:flex;flex-direction:column;position:absolute;top:74px;left:0;right:0;background:#fff;
    padding:20px 24px;gap:18px;border-bottom:1px solid var(--line);box-shadow:0 18px 30px -20px rgba(0,0,0,.25);
  }
  section{padding:64px 0}
  .hero{padding:72px 0 84px}
  .hero .meta{gap:28px;margin-top:42px}
  .page-hero{padding:54px 0 48px}
  .pain{padding:20px 22px;gap:16px}
  .pain .no{font-size:26px;min-width:44px}
  .contact-block{grid-template-columns:1fr;gap:44px}
  footer .cols{grid-template-columns:1fr;gap:28px}
  .steps::before{left:24px}
  .step .dot{flex:0 0 50px;width:50px;height:50px;font-size:17px}
  .qrbox{gap:28px}
}