:root{--ink:#102331;--muted:#60717d;--line:#dce4e8;--paper:#f4f7f8;--white:#fff;--blue:#1769aa;--blue-deep:#0d3855;--red:#d54a37;--gold:#d5aa52;--green:#167862;--shadow:0 18px 45px rgba(13,56,85,.1)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--paper)}
body{margin:0;color:var(--ink);background:var(--white);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit}
:focus-visible{outline:3px solid #79b7e5;outline-offset:3px}
.shell{width:min(1180px,calc(100% - 40px));margin:auto}
.site-header{position:relative;z-index:30;height:76px;border-bottom:1px solid rgba(255,255,255,.18);color:#fff}
.site-header.on-light{border-color:var(--line);color:var(--ink);background:rgba(255,255,255,.94);backdrop-filter:blur(18px)}
.site-header .shell{display:flex;height:100%;align-items:center;justify-content:space-between;gap:30px}
.brand{display:flex;align-items:center;gap:11px;font-weight:850}
.brand img{width:42px;height:42px;border-radius:8px;background:#fff}
.brand span{display:grid;line-height:1.1}.brand small{margin-top:5px;color:currentColor;font-size:8px;font-weight:700;letter-spacing:.16em;opacity:.62}
.nav{display:flex;align-items:center;gap:28px}.nav>a{font-size:14px}.nav>a:not(.nav-cta):hover{color:#75bcec}.on-light .nav>a:not(.nav-cta):hover{color:var(--blue)}
.nav-cta,.button{display:inline-flex;height:44px;align-items:center;justify-content:center;gap:9px;padding:0 18px;border:1px solid transparent;border-radius:5px;font-size:14px;font-weight:800}
.nav-cta{background:#fff;color:var(--blue-deep)}.on-light .nav-cta,.button.primary{background:var(--blue-deep);color:#fff}
.button.secondary{border-color:rgba(255,255,255,.55);background:rgba(255,255,255,.08);color:#fff}.button.light{border-color:var(--line);background:#fff;color:var(--ink)}
.menu-toggle{display:none;width:42px;height:42px;border:0;background:transparent;color:inherit;font-size:24px}
.hero{position:relative;min-height:min(82svh,780px);margin-top:-76px;overflow:hidden;background:#0a1b26;color:#fff}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.hero:after{position:absolute;inset:0;background:linear-gradient(90deg,rgba(4,15,22,.93) 0%,rgba(6,22,32,.78) 34%,rgba(6,22,32,.2) 68%,rgba(6,22,32,.06));content:""}
.hero .shell{position:relative;z-index:2;display:flex;min-height:min(82svh,780px);align-items:center;padding:118px 0 72px}
.hero-copy{width:min(630px,58%)}
.eyebrow{display:block;color:#77bce8;font-size:11px;font-weight:850;letter-spacing:.18em;text-transform:uppercase}
.hero h1{max-width:620px;margin:18px 0 22px;font-size:clamp(42px,5.5vw,74px);line-height:1.08;letter-spacing:0}
.hero h1 span{color:#83c8f2}.hero p{max-width:560px;margin:0;color:rgba(255,255,255,.74);font-size:18px;line-height:1.9}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hero .button.primary{background:#fff;color:#10344d}.hero-note{display:flex;flex-wrap:wrap;gap:22px;margin-top:38px;color:rgba(255,255,255,.64);font-size:12px}.hero-note span:before{margin-right:7px;color:#80caac;content:"✓"}
.trust-strip{border-bottom:1px solid var(--line);background:#fff}.trust-strip .shell{display:grid;grid-template-columns:1.2fr repeat(3,1fr);align-items:center;min-height:106px}.trust-strip strong{font-size:18px}.trust-strip div{padding:10px 26px;border-left:1px solid var(--line)}.trust-strip b,.trust-strip span{display:block}.trust-strip b{font-size:15px}.trust-strip span{margin-top:4px;color:var(--muted);font-size:12px}
.section{padding:96px 0}.section.soft{background:var(--paper)}.section.dark{background:#102633;color:#fff}.section.gold{background:#f4efe5}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:44px}.section-head>div{max-width:710px}.section-head h2{margin:12px 0 0;font-size:clamp(30px,4vw,48px);line-height:1.2}.section-head p{max-width:470px;margin:0;color:var(--muted)}.dark .section-head p{color:rgba(255,255,255,.66)}
.path-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.path-card{position:relative;min-height:370px;padding:40px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}.path-card.seller{background:#123d59;color:#fff}.path-card .index{color:var(--gold);font-size:11px;font-weight:800;letter-spacing:.15em}.path-card h3{max-width:390px;margin:62px 0 14px;font-size:31px;line-height:1.28}.path-card p{max-width:420px;color:var(--muted)}.path-card.seller p{color:rgba(255,255,255,.68)}.text-link{display:inline-flex;align-items:center;gap:12px;margin-top:25px;color:var(--blue);font-size:14px;font-weight:850}.seller .text-link{color:#95d4fa}.path-card:after{position:absolute;top:28px;right:28px;color:currentColor;font-size:54px;font-weight:200;opacity:.12;content:"↗"}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;border:1px solid var(--line);background:var(--line)}.feature{min-height:240px;padding:30px;background:#fff}.feature i{display:grid;width:42px;height:42px;place-items:center;border-radius:7px;background:#e9f4fb;color:var(--blue);font-size:18px;font-style:normal}.feature h3{margin:28px 0 9px;font-size:19px}.feature p{margin:0;color:var(--muted);font-size:14px}
.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.category-card{position:relative;min-height:310px;border-radius:7px;overflow:hidden;background:#132b3a;color:#fff}.category-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;image-rendering:auto}.category-card:after{position:absolute;inset:0;background:linear-gradient(0deg,rgba(5,18,26,.88),rgba(5,18,26,.08) 68%);content:""}.category-card div{position:absolute;z-index:2;right:20px;bottom:20px;left:20px}.category-card h3{margin:0;font-size:19px}.category-card p{margin:4px 0 0;color:rgba(255,255,255,.68);font-size:12px}
.process{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid rgba(255,255,255,.18)}.process article{min-height:250px;padding:34px 28px;border-right:1px solid rgba(255,255,255,.18)}.process article:last-child{border:0}.process em{color:var(--gold);font-size:12px;font-style:normal}.process h3{margin:52px 0 10px;font-size:20px}.process p{margin:0;color:rgba(255,255,255,.62);font-size:13px}
.answer-band{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center}.answer-band h2{margin:12px 0 20px;font-size:44px;line-height:1.2}.answer-band p{color:#5d6d76}.answer-list{border-top:1px solid #cfd7d7}.answer-list div{display:grid;grid-template-columns:112px 1fr;gap:18px;padding:20px 0;border-bottom:1px solid #cfd7d7}.answer-list b{font-size:13px}.answer-list span{color:#60717a;font-size:13px}
.cta-band{padding:74px 0;background:#1769aa;color:#fff}.cta-band .shell{display:flex;align-items:center;justify-content:space-between;gap:30px}.cta-band h2{margin:0;font-size:35px}.cta-band p{margin:8px 0 0;color:rgba(255,255,255,.72)}
.page-hero{padding:86px 0 72px;background:#102d40;color:#fff}.page-hero .shell{display:grid;grid-template-columns:1fr .7fr;gap:70px;align-items:end}.page-hero h1{margin:15px 0 18px;font-size:clamp(38px,5vw,62px);line-height:1.12}.page-hero p{margin:0;color:rgba(255,255,255,.7);font-size:17px}.page-hero aside{padding:24px;border-left:2px solid var(--gold);color:rgba(255,255,255,.72);font-size:14px}
.content-grid{display:grid;grid-template-columns:260px minmax(0,1fr);gap:70px}.side-index{position:sticky;top:24px;align-self:start;border-top:1px solid var(--line)}.side-index a{display:block;padding:14px 0;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}.article section{padding:0 0 56px}.article h2{margin:0 0 17px;font-size:30px}.article h3{margin:28px 0 9px;font-size:18px}.article p,.article li{color:#536570}.article ul{padding-left:20px}.article .fact{margin:24px 0;padding:20px;border-left:3px solid var(--blue);background:#edf5fa;color:#354f60}.step-list{display:grid;gap:10px}.step-list article{display:grid;grid-template-columns:48px 1fr;gap:18px;padding:22px;border:1px solid var(--line);border-radius:7px}.step-list b{color:var(--blue);font-size:13px}.step-list h3{margin:0 0 4px}.step-list p{margin:0}
.faq-list{border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{display:flex;min-height:76px;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;font-size:17px;font-weight:800;list-style:none}.faq-list summary:after{font-size:22px;font-weight:400;content:"+"}.faq-list details[open] summary:after{content:"−"}.faq-list details p{max-width:800px;margin:0;padding:0 0 24px;color:var(--muted)}
.site-footer{padding:56px 0 28px;background:#0b202d;color:#fff}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:44px}.footer-brand p{max-width:310px;color:rgba(255,255,255,.56);font-size:13px}.footer-col b{display:block;margin-bottom:14px;font-size:13px}.footer-col a{display:block;margin:8px 0;color:rgba(255,255,255,.58);font-size:12px}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:45px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.42);font-size:11px}
@media(max-width:900px){.nav{display:none;position:absolute;top:76px;right:20px;left:20px;align-items:stretch;flex-direction:column;gap:0;padding:12px;border:1px solid var(--line);background:#fff;color:var(--ink);box-shadow:var(--shadow)}.nav.open{display:flex}.nav>a{padding:11px}.menu-toggle{display:grid;place-items:center}.hero-copy{width:75%}.trust-strip .shell{grid-template-columns:1fr 1fr}.trust-strip strong{padding:22px 0}.trust-strip div{padding:17px;border-top:1px solid var(--line)}.feature-grid{grid-template-columns:1fr 1fr}.category-grid{grid-template-columns:1fr 1fr}.process{grid-template-columns:1fr 1fr}.process article:nth-child(2){border-right:0}.process article:nth-child(-n+2){border-bottom:1px solid rgba(255,255,255,.18)}.answer-band,.page-hero .shell{grid-template-columns:1fr}.content-grid{grid-template-columns:1fr}.side-index{position:static;display:flex;gap:18px;overflow-x:auto}.side-index a{flex:0 0 auto}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.shell{width:min(100% - 28px,1180px)}.site-header{height:66px}.nav{top:66px;right:14px;left:14px}.brand img{width:36px;height:36px}.brand small{display:none}.hero{min-height:700px;margin-top:-66px}.hero .shell{min-height:700px;align-items:flex-end;padding:112px 0 64px}.hero-bg{object-position:63% center}.hero:after{background:linear-gradient(0deg,rgba(4,15,22,.96),rgba(4,15,22,.58) 68%,rgba(4,15,22,.22))}.hero-copy{width:100%}.hero h1{font-size:43px}.hero p{font-size:15px}.hero-actions{display:grid}.button{width:100%}.hero-note{gap:10px;flex-direction:column}.trust-strip .shell{grid-template-columns:1fr}.trust-strip strong{padding-bottom:12px}.trust-strip div{padding:13px 0;border-left:0}.section{padding:66px 0}.section-head{align-items:start;flex-direction:column;margin-bottom:30px}.section-head p{font-size:14px}.path-grid,.feature-grid,.category-grid{grid-template-columns:1fr}.path-card{min-height:320px;padding:28px}.path-card h3{margin-top:54px;font-size:27px}.feature{min-height:210px}.category-card{min-height:360px}.process{grid-template-columns:1fr}.process article{min-height:auto;border-right:0;border-bottom:1px solid rgba(255,255,255,.18)!important}.answer-band{gap:38px}.answer-band h2{font-size:34px}.answer-list div{grid-template-columns:1fr;gap:4px}.cta-band .shell{align-items:flex-start;flex-direction:column}.cta-band h2{font-size:29px}.page-hero{padding:62px 0 54px}.page-hero .shell{gap:28px}.page-hero aside{font-size:13px}.content-grid{gap:35px}.article h2{font-size:26px}.step-list article{grid-template-columns:35px 1fr;padding:18px 15px}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}