:root { --bg: #071c33; --panel: #102c4c; --fg: #eff6ff; --muted: #a8bbcd; --accent: #52c8fa; --line: #31455b; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif; line-height: 1.85; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
img { width: 100%; display: block; object-fit: cover; }
.container { width: min(1180px, calc(100% - 44px)); margin: 0 auto; }
.site-header { background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 76px; gap: 24px; }
.brand { font-size: 21px; font-weight: 900; white-space: nowrap; }
.brand-mark { color: var(--accent); margin-right: 6px; }
.nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 14px; }
.nav a { opacity: .9; }
.hero { padding: 38px 0 28px; }
.hero-layout { display: grid; grid-template-columns: 1.45fr 1fr; gap: 20px; }
.hero-main { min-height: 450px; position: relative; border-radius: 20px; overflow: hidden; background: #1a2b3b; }
.hero-main img { position: absolute; inset: 0; height: 100%; }
.hero-main::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,.87), rgba(0,0,0,.12)); }
.hero-copy { position: relative; z-index: 2; color: white; padding: 65px 44px; max-width: 560px; }
.hero-copy h1 { font-size: clamp(29px, 3.6vw, 47px); line-height: 1.32; margin: 14px 0; }
.hero-copy p { color: #e3eaf0; }
.eyebrow { font-size: 12px; color: var(--accent); font-weight: 800; letter-spacing: 2px; }
.button { display: inline-block; background: var(--accent); color: #10151d; border-radius: 999px; padding: 10px 23px; font-weight: 800; margin-top: 12px; }
.hero-aside { display: grid; grid-template-rows: 1fr 1fr; gap: 20px; }
.aside-tile { min-height: 210px; position: relative; border-radius: 18px; overflow: hidden; }
.aside-tile img { position: absolute; inset: 0; height: 100%; }
.aside-tile::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,0,0,.85), transparent 80%); }
.aside-tile span { position: absolute; z-index: 1; bottom: 20px; left: 22px; color: white; font-weight: 800; font-size: 20px; }
.section { padding: 35px 0; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 15px; margin-bottom: 23px; }
h2 { font-size: 27px; line-height: 1.4; margin: 0; }
h3 { font-size: 18px; line-height: 1.5; margin: 8px 0; }
.sub { color: var(--muted); margin: 5px 0 0; }
.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: transform .2s; }
.card:hover { transform: translateY(-3px); }
.card img { aspect-ratio: 16/10; }
.card-text { padding: 16px 17px 19px; }
.card-text p { font-size: 14px; color: var(--muted); margin: 6px 0 10px; }
.tag { font-size: 12px; color: var(--accent); font-weight: 800; }
.feature { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 35px; background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 28px; }
.feature img { aspect-ratio: 16/10; border-radius: 14px; }
.feature p { color: var(--muted); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.step strong { color: var(--accent); display: block; font-size: 24px; }
.prose { max-width: 870px; font-size: 16px; }
.prose h2 { margin: 32px 0 12px; }
.prose p { margin: 13px 0; }
.prose ul { padding-left: 23px; }
.faq { border-bottom: 1px solid var(--line); padding: 15px 0; }
.faq summary { cursor: pointer; font-weight: 800; }
.page-intro { padding: 52px 0 26px; }
.page-intro h1 { font-size: clamp(28px, 4vw, 44px); margin: 0 0 8px; line-height: 1.35; }
.cover { border-radius: 20px; max-height: 420px; aspect-ratio: 16/7; }
.callout { background: var(--panel); border-left: 4px solid var(--accent); padding: 15px 20px; border-radius: 8px; }
.footer { background: var(--panel); border-top: 1px solid var(--line); margin-top: 56px; padding: 45px 0; color: var(--muted); font-size: 14px; }
.footer a { margin-right: 16px; }
.footer strong { color: var(--fg); }
@media (max-width: 900px) { .hero-layout, .feature { grid-template-columns: 1fr; } .cards, .cards.three { grid-template-columns: repeat(2, minmax(0, 1fr)); } .hero-aside { grid-template-columns: 1fr 1fr; grid-template-rows: auto; } .header-inner { flex-direction: column; align-items: flex-start; padding: 13px 0; gap: 10px; } }
@media (max-width: 570px) { .container { width: calc(100% - 30px); } .hero { padding-top: 20px; } .hero-copy { padding: 40px 25px; } .hero-main { min-height: 390px; } .hero-aside, .cards, .cards.three, .steps { grid-template-columns: 1fr; } .hero-aside { display: grid; } .aside-tile { min-height: 185px; } .nav { gap: 12px; font-size: 13px; } .section { padding: 23px 0; } .feature { padding: 19px; } }