:root{--bg:#f6f8fb;--bg-soft:#eef2f7;--card:#fff;--border:#e3e8ef;--text:#17212e;--text-2:#5a6b7f;--text-3:#8a99ab;--brand:#2563eb;--brand-2:#06b6d4;--brand-grad:linear-gradient(120deg, #2563eb 0%, #06b6d4 100%);--accent:#f97316;--ok:#16a34a;--warn:#d97706;--err:#dc2626;--shadow:0 1px 2px #17212e0d, 0 8px 24px #17212e12;--radius:14px;--nav-h:60px}[data-theme=dark]{--bg:#0d1420;--bg-soft:#111a29;--card:#16202f;--border:#243449;--text:#e8eef5;--text-2:#9fb0c3;--text-3:#6b7d92;--brand:#3b82f6;--brand-2:#22d3ee;--shadow:0 1px 2px #0000004d, 0 10px 28px #00000059}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:PingFang SC,Microsoft YaHei,Segoe UI,system-ui,sans-serif;line-height:1.6;transition:background .25s,color .25s}a{color:inherit;text-decoration:none}img{max-width:100%}.wrap{max-width:1160px;margin:0 auto;padding:0 24px}.nav{z-index:100;height:var(--nav-h);background:color-mix(in srgb, var(--bg) 82%, transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);position:sticky;top:0}.nav .wrap{align-items:center;gap:26px;height:100%;display:flex}.logo{align-items:center;gap:9px;font-size:17px;font-weight:800;display:flex}.logo-mark{background:var(--brand-grad);color:#fff;border-radius:8px;place-items:center;width:30px;height:30px;font-size:15px;font-weight:900;display:grid}.logo b{background:var(--brand-grad);color:#0000;-webkit-background-clip:text;background-clip:text}.nav-links{color:var(--text-2);gap:22px;margin-left:8px;font-size:14px;display:flex}.nav-links a:hover{color:var(--brand)}.nav-spacer{flex:1}.btn{border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;white-space:nowrap;border-radius:10px;justify-content:center;align-items:center;gap:7px;padding:9px 18px;font-size:14px;transition:all .18s;display:inline-flex}.btn:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}.btn-primary{background:var(--brand-grad);color:#fff;box-shadow:0 4px 14px color-mix(in srgb, var(--brand) 35%, transparent);border:none;font-weight:600}.btn-primary:hover{color:#fff;filter:brightness(1.07)}.btn-ghost{background:0 0}.icon-btn{border-radius:9px;place-items:center;width:36px;height:36px;padding:0;font-size:16px;display:inline-grid}.hero{padding:84px 0 60px;position:relative;overflow:hidden}.hero:before{content:"";background:radial-gradient(600px 300px at 18% 30%, color-mix(in srgb, var(--brand) 14%, transparent), transparent 70%), radial-gradient(500px 260px at 80% 20%, color-mix(in srgb, var(--brand-2) 13%, transparent), transparent 70%);pointer-events:none;height:130%;position:absolute;inset:-40% -20% auto}.hero .wrap{text-align:center;position:relative}.hero-badge{border:1px solid color-mix(in srgb, var(--brand) 35%, var(--border));background:color-mix(in srgb, var(--brand) 7%, var(--card));color:var(--brand);border-radius:999px;align-items:center;gap:8px;margin-bottom:22px;padding:5px 14px;font-size:13px;display:inline-flex}.hero h1{letter-spacing:-.5px;margin-bottom:18px;font-size:clamp(34px,5.4vw,58px);font-weight:900;line-height:1.22}.hero h1 span{background:var(--brand-grad);color:#0000;-webkit-background-clip:text;background-clip:text}.hero p.sub{color:var(--text-2);max-width:640px;margin:0 auto 30px;font-size:17px}.hero-actions{flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:30px;display:flex}.hero-actions .btn{padding:12px 26px;font-size:15px}.hero-tags{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.tag{color:var(--text-2);border:1px solid var(--border);background:var(--card);border-radius:999px;padding:5px 13px;font-size:13px}.metric-band{grid-template-columns:repeat(4,1fr);gap:14px;margin-top:46px;display:grid}.metric{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 10px}.metric b{background:var(--brand-grad);color:#0000;-webkit-background-clip:text;background-clip:text;font-size:26px;font-weight:800;display:block}.metric span{color:var(--text-3);font-size:13px}section.block{padding:72px 0}section.block.alt{background:var(--bg-soft)}.sec-head{text-align:center;margin-bottom:44px}.sec-head .kicker{color:var(--brand);letter-spacing:2px;margin-bottom:8px;font-size:13px;font-weight:700}.sec-head h2{letter-spacing:-.3px;font-size:clamp(24px,3.4vw,36px);font-weight:800}.sec-head p{color:var(--text-2);margin-top:10px;max-width:620px;margin-inline:auto}.grid-3{grid-template-columns:repeat(3,1fr);gap:18px;display:grid}.core-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 24px;transition:transform .2s}.core-card:hover{transform:translateY(-4px)}.core-card .ic{background:color-mix(in srgb, var(--brand) 10%, transparent);border-radius:12px;place-items:center;width:46px;height:46px;margin-bottom:16px;font-size:22px;display:grid}.core-card h3{margin-bottom:8px;font-size:18px}.core-card p{color:var(--text-2);font-size:14px}.disc-grid{grid-template-columns:repeat(2,1fr);gap:18px;display:grid}.disc-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 26px 22px;transition:transform .2s;position:relative;overflow:hidden}.disc-card:hover{transform:translateY(-4px)}.disc-card:before{content:"";background:var(--dc,var(--brand-grad));height:4px;position:absolute;inset:0 0 auto}.disc-head{align-items:center;gap:12px;margin-bottom:14px;display:flex}.disc-head .em{background:color-mix(in srgb, var(--dcolor,var(--brand)) 12%, transparent);border-radius:11px;place-items:center;width:44px;height:44px;font-size:22px;display:grid}.disc-head h3{font-size:19px}.disc-head small{color:var(--text-3);font-size:12.5px;font-weight:400;display:block}.disc-card ul{gap:8px;list-style:none;display:grid}.disc-card li{color:var(--text-2);padding-left:22px;font-size:14px;position:relative}.disc-card li:before{content:"✓";color:var(--dcolor,var(--brand));font-weight:700;position:absolute;left:2px}.disc-card.d-arch{--dcolor:#0ea5e9;--dc:linear-gradient(90deg, #0ea5e9, #38bdf8)}.disc-card.d-str{--dcolor:#f59e0b;--dc:linear-gradient(90deg, #f59e0b, #fbbf24)}.disc-card.d-mep{--dcolor:#10b981;--dc:linear-gradient(90deg, #10b981, #34d399)}.disc-card.d-steel{--dcolor:#64748b;--dc:linear-gradient(90deg, #64748b, #94a3b8)}.flow{counter-reset:step;grid-template-columns:repeat(5,1fr);gap:14px;display:grid}.flow-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);counter-increment:step;padding:22px 18px;position:relative}.flow-item:before{content:counter(step, decimal-leading-zero);color:color-mix(in srgb, var(--brand) 22%, 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0 34px}.foot{color:var(--text-3);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;font-size:13px;display:flex}.foot-links{gap:18px;display:flex}.foot-links a:hover{color:var(--brand)}.reveal{opacity:0;transition:opacity .5s,transform .5s;transform:translateY(18px)}.reveal.in{opacity:1;transform:none}@media (width<=900px){.grid-3,.steps,.metric-band,.data-panel{grid-template-columns:repeat(2,1fr)}.disc-grid{grid-template-columns:1fr}.flow{grid-template-columns:repeat(2,1fr)}.nav-links{display:none}}@media (width<=560px){.grid-3,.steps,.metric-band,.data-panel,.flow{grid-template-columns:1fr}}