/* 黎曼创新官网 · Riemann Innovation */
:root{
  --brand-blue:#3792E4; --brand-teal:#12DDC8;
  --navy-900:#081C30; --navy-800:#0C2A47; --navy-700:#123A5E;
  --weld-orange:#FF8A3D;
  --surface:#FFFFFF; --surface-alt:#F4F7FA;
  --ink:#12222F; --ink-2:#4A5B6A; --ink-3:#8A9AA8;
  --line:#D8E2EA;
  --on-dark:#FFFFFF; --on-dark-2:#9FB8CE; --dark-line:#24405E;
  --font-cn:"Noto Sans SC","PingFang SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-cn);color:var(--ink);background:var(--surface);font-size:16px;line-height:1.7}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1240px;margin:0 auto;padding:0 24px}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
.nav-logo img{height:52px;width:auto}
.nav-links{display:flex;gap:36px;list-style:none}
.nav-links a{font-size:15px;font-weight:500;color:var(--ink-2);transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--brand-blue)}
.nav-links a.active{font-weight:700}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 30px;font-size:15px;font-weight:500;cursor:pointer;border:none;transition:.2s}
.btn-primary{background:var(--brand-blue);color:#fff}
.btn-primary:hover{background:#2b7fce}
.btn-ghost-dark{border:1px solid #3D5A78;color:#fff}
.btn-ghost-dark:hover{border-color:var(--brand-teal);color:var(--brand-teal)}
.btn-ghost{border:1px solid var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--brand-blue);color:var(--brand-blue)}
.nav .btn{padding:11px 24px}
.arrow::after{content:"→";font-family:var(--font-mono)}

/* ---------- Section scaffolding ---------- */
.section{padding:96px 0}
.section-alt{background:var(--surface-alt)}
.section-dark{background:var(--navy-900);color:var(--on-dark)}
.section-gradient{background:linear-gradient(160deg,var(--navy-800),var(--navy-900));color:var(--on-dark)}
.eyebrow{font-family:var(--font-mono);font-size:13px;letter-spacing:2px;color:var(--brand-blue);margin-bottom:16px}
.section-dark .eyebrow,.section-gradient .eyebrow{color:var(--brand-teal)}
h1{font-size:52px;font-weight:700;line-height:1.25}
h2{font-size:36px;font-weight:700;line-height:1.35;margin-bottom:14px}
h3{font-size:19px;font-weight:700}
.sub{font-size:16.5px;color:var(--ink-2);max-width:820px;line-height:1.85}
.section-dark .sub,.section-gradient .sub{color:var(--on-dark-2)}
.section-head{margin-bottom:48px}

/* ---------- Hero ---------- */
.hero{padding:88px 0 0}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding-bottom:64px}
.hero .eyebrow{display:flex;align-items:center;gap:12px}
.hero .eyebrow::before{content:"";width:28px;height:2px;background:var(--brand-teal)}
.hero h1 .hl{display:inline-block;padding:0 14px;background:linear-gradient(90deg,var(--brand-teal),var(--brand-blue));color:var(--navy-900)}
.hero-sub{margin:26px 0 32px;font-size:17px;color:var(--on-dark-2);line-height:1.85}
.hero-ctas{display:flex;gap:16px}
.hero-visual{border:1px solid #2A4A6B;background:var(--navy-800);position:relative;overflow:hidden}
.hero-visual svg{display:block;width:100%;height:auto}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--dark-line);padding:36px 0}
.stat{padding:0 40px;border-left:1px solid var(--dark-line)}
.stat:first-child{border-left:none;padding-left:0}
.stat b{display:block;font-family:var(--font-mono);font-size:34px;font-weight:600;color:var(--brand-teal)}
.stat span{font-size:14px;color:var(--on-dark-2)}

/* ---------- Cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.card{border:1px solid var(--line);background:var(--surface);padding:32px}
.card .icon{width:52px;height:52px;display:flex;align-items:center;justify-content:center;background:var(--surface-alt);margin-bottom:18px;color:var(--brand-blue)}
.card h3{margin-bottom:12px;font-size:21px}
.card p{font-size:14.5px;color:var(--ink-2);line-height:1.8}
.icon svg{width:26px;height:26px}

/* dark cards */
.card-dark{background:var(--navy-800);border:1px solid var(--dark-line);padding:32px}
.card-dark h3{color:var(--on-dark);display:flex;align-items:center;gap:12px;font-size:20px;margin-bottom:14px}
.card-dark .bar{width:44px;height:3px;margin-bottom:14px}
.card-dark p{font-size:14.5px;color:var(--on-dark-2);line-height:1.8}
.card-line{border:1px solid var(--dark-line);padding:26px 24px}
.card-line .rule-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.card-line .rule-head .en{font-family:var(--font-mono);font-size:11px;letter-spacing:1.5px;color:#5A7A9A}
.card-line h4{color:var(--on-dark);font-size:17px;margin-bottom:10px}
.card-line p{font-size:13.5px;color:var(--on-dark-2);line-height:1.75}

/* ---------- Pipeline ---------- */
.pipeline{border:1px solid var(--line);background:var(--surface)}
.pipeline-head{display:flex;justify-content:space-between;padding:20px 32px;border-bottom:1px solid var(--line);font-family:var(--font-mono);font-size:13px;letter-spacing:2px;color:var(--ink-3)}
.pipeline-row{display:flex;align-items:center;padding:40px 32px;gap:4px}
.pipe-step{flex:1;text-align:center}
.pipe-step .dot{width:56px;height:56px;border-radius:50%;background:var(--surface-alt);color:var(--brand-blue);display:flex;align-items:center;justify-content:center;margin:0 auto 10px}
.pipe-step .dot.final{background:var(--navy-800);color:var(--brand-teal)}
.pipe-step b{display:block;font-size:15px}
.pipe-step span{font-size:12px;color:var(--ink-3)}
.pipe-arrow{color:var(--brand-blue);font-family:var(--font-mono);font-size:18px}
.pipeline-banner{background:var(--navy-900);color:var(--brand-teal);text-align:center;padding:18px;font-size:17px;font-weight:500}

/* ---------- Table ---------- */
.cmp-table{width:100%;border-collapse:collapse;border:1px solid var(--line)}
.cmp-table th{background:var(--navy-900);color:#fff;text-align:left;padding:18px 24px;font-size:15px}
.cmp-table td{padding:16px 24px;border-top:1px solid var(--line);font-size:15px}
.cmp-table td:first-child{font-weight:500;width:220px}
.cmp-table td.good::before{content:"✓  ";color:var(--brand-teal);font-weight:700}
.cmp-table td.bad{color:var(--ink-3)}
.cmp-table td.bad::before{content:"✗  ";color:#C4CDD5}
.roi-table{width:100%;border-collapse:collapse;border:1px solid var(--dark-line)}
.roi-table th{background:var(--navy-700);color:#fff;text-align:left;padding:15px 22px;font-size:14.5px}
.roi-table td{padding:15px 22px;border-top:1px solid var(--dark-line);font-size:14.5px;color:var(--on-dark-2);background:var(--navy-800)}
.roi-table td:first-child{color:var(--on-dark);font-weight:500}
.roi-table td.save{color:var(--brand-teal);font-weight:700}
.roi-table tr.total td{background:#0F3050;color:var(--on-dark);font-weight:700}

/* ---------- Steps (7步/预约) ---------- */
.step-card{background:var(--surface-alt);border:1px solid var(--line);padding:24px 22px}
.step-card .step-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;color:var(--brand-blue)}
.step-card .num{font-family:var(--font-mono);font-size:22px;font-weight:600;color:#C9D6E2}
.step-card b{display:block;font-size:17px;margin-bottom:8px}
.step-card p{font-size:13.5px;color:var(--ink-2);line-height:1.7}

/* ---------- Feature list ---------- */
.check-list{list-style:none}
.check-list li{position:relative;padding-left:24px;font-size:13.5px;color:var(--ink-2);line-height:1.65;margin-bottom:10px}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--brand-teal);font-weight:700}

/* ---------- Split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split-visual{border:1px solid var(--line);background:var(--navy-800);overflow:hidden}
.split-visual svg{display:block;width:100%;height:auto}

/* ---------- Footer ---------- */
.footer{background:var(--navy-900);color:var(--on-dark-2);border-top:1px solid var(--dark-line);padding:64px 0 32px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:40px}
.footer-logo img{height:56px;width:auto;margin-bottom:16px}
.footer p{font-size:13.5px;line-height:1.9}
.footer h4{color:var(--on-dark);font-size:15px;margin-bottom:14px}
.footer ul{list-style:none}
.footer li{margin-bottom:10px;font-size:13.5px}
.footer li a:hover{color:var(--brand-teal)}
.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--dark-line);padding-top:24px;font-size:12.5px;color:#5A7A9A}
.footer-bottom .en{font-family:var(--font-mono);letter-spacing:1.5px}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(160deg,var(--navy-800),var(--navy-900));color:#fff;text-align:center;padding:88px 0}
.cta-band h2{font-size:40px;margin-bottom:14px}
.cta-band p{color:var(--on-dark-2);font-size:17px;margin-bottom:32px}
.cta-band .hero-ctas{justify-content:center}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{padding:80px 0}
.page-hero h1{font-size:46px}
.page-hero .sub{margin-top:22px}
.breadcrumb{font-size:13px;color:var(--ink-3);margin-bottom:20px}
.breadcrumb .cur{color:var(--brand-blue)}
.page-hero-light{background:var(--surface-alt)}

/* ---------- Misc ---------- */
.tag{display:inline-block;padding:5px 14px;font-family:var(--font-mono);font-size:12px;letter-spacing:1.5px;border:1px solid var(--line);color:var(--ink-3)}
.tag-dark{background:var(--navy-900);color:var(--brand-teal);border:none}
.note{display:flex;gap:10px;align-items:center;background:#FFF4EA;border:1px solid #F5D3B3;color:#8A4B12;padding:16px 24px;font-size:14.5px}
.mono{font-family:var(--font-mono)}

/* ---------- Form ---------- */
.form-card{background:#fff;border:1px solid var(--line);padding:36px}
.form-card h3{font-size:22px;margin-bottom:20px}
.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;font-weight:500;margin-bottom:8px}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);font-size:13.5px;font-family:var(--font-cn);color:var(--ink);background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand-blue);outline-offset:-1px}
.field textarea{height:96px;resize:vertical}
.form-card .btn{width:100%;justify-content:center}
.privacy{font-size:12px;color:var(--ink-3);margin-top:14px;line-height:1.6}

/* ---------- Solution rows ---------- */
.sol-row{display:grid;grid-template-columns:300px 1fr;gap:40px;border:1px solid var(--line);padding:36px;margin-bottom:32px}
.sol-row:nth-child(odd){background:var(--surface-alt)}
.sol-row .num{font-family:var(--font-mono);font-size:28px;font-weight:600;color:#C9D6E2}
.sol-row h3{font-size:26px;margin:8px 0 12px}
.sol-row .claim{color:var(--brand-blue);font-weight:500;font-size:15px;line-height:1.6}
.sol-item{display:flex;gap:12px;margin-bottom:14px;font-size:14.5px;color:var(--ink-2);line-height:1.75}
.sol-item::before{content:"";flex:0 0 3px;height:20px;margin-top:4px}
.sol-item.pain::before{background:var(--weld-orange)}
.sol-item.plan::before{background:var(--brand-blue)}
.sol-item.win::before{background:var(--brand-teal)}

@media (max-width:900px){
  .hero-grid,.split,.grid-3,.grid-4,.grid-2,.footer-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:24px}
  .stat{border:none;padding:0}
  h1{font-size:36px}.page-hero h1{font-size:34px}h2{font-size:28px}
  .nav-links{display:none}
  .sol-row{grid-template-columns:1fr}
  .pipeline-row{flex-wrap:wrap;gap:16px}
}

/* ---------- Photo cards ---------- */
.card-photo{padding:0;overflow:hidden}
.card-photo .card-img{height:160px;overflow:hidden;background:var(--navy-800)}
.card-photo .card-img img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s}
.card-photo:hover .card-img img{transform:scale(1.04)}
.card-photo .card-body{padding:22px}
.card-photo .card-body h3{margin-bottom:10px}
.grid-2 .card-photo .card-img{height:200px}
.sol-thumb{height:130px;overflow:hidden;margin-bottom:14px;border:1px solid var(--line)}
.sol-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.hero-visual img{min-height:420px}
.step-top .step-ic{color:var(--brand-blue);display:flex}
.step-top .step-ic svg{width:24px;height:24px}