:root {
  --black: #000;
  --ink: #12151B;
  --muted: #5E6470;
  --faint: #8A909C;
  --line: #E6E8EC;
  --gray: #F4F5F7;
  --accent: #1CD2FF;
  --accent-deep: #00B8E8;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --num: "DIN Alternate", "Bahnschrift", "Avenir Next", var(--font);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 104px; color-scheme: light; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.75; color: var(--ink); background: #fff; -webkit-font-smoothing: antialiased; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent-deep); outline-offset: 3px; }

.wrap { width: 100%; max-width: 1360px; margin: 0 auto; padding-left: 48px; padding-right: 48px; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; padding: 8px 16px; background: var(--accent); color: #000; border-radius: 999px; font-weight: 700; }
.skip:focus { top: 12px; }

/* 顶部导航 */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; background: #000; color: #fff; transition: background-color .25s; }
.site-header.is-top { background: linear-gradient(rgba(0, 0, 0, .55), rgba(0, 0, 0, 0)); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 36px; height: 36px; flex: none; }
.brand-name { font-size: 22px; font-weight: 800; letter-spacing: .1em; line-height: 1; }
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a { padding: 10px 20px; font-size: 16px; font-weight: 600; transition: color .15s; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }
.site-nav .nav-cta { margin-left: 16px; padding: 10px 26px; color: #000; background: var(--accent); border-radius: 999px; font-weight: 700; transition: background-color .15s; }
.site-nav .nav-cta:hover, .site-nav .nav-cta[aria-current="page"] { color: #000; background: #fff; }
.nav-toggle { display: none; width: 44px; height: 44px; margin-right: -10px; padding: 0; background: none; border: 0; cursor: pointer; }
.nav-toggle svg { margin: auto; }
main { padding-top: 80px; }
.home main { padding-top: 0; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 0 34px; font-size: 16px; font-weight: 700; letter-spacing: .04em; border-radius: 999px; transition: background-color .15s, color .15s, border-color .15s; }
.btn--lg { min-height: 60px; padding: 0 42px; font-size: 18px; }
.btn--accent { color: #000; background: var(--accent); }
.btn--accent:hover { background: #fff; }
.btn--dark { color: #fff; background: #000; }
.btn--dark:hover { background: #2A2E37; }
.btn--ghost { color: #fff; border: 1.5px solid rgba(255, 255, 255, .6); }
.btn--ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .12); }

/* 首页主视觉 */
.hero { position: relative; display: flex; align-items: center; height: 92vh; min-height: 600px; max-height: 820px; overflow: hidden; color: #fff; background: #03050B; }
.hero-art { position: absolute; top: 0; left: 0; width: 100%; height: 100%; max-width: none; object-fit: cover; object-position: 70% 50%; }
.hero::after { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(90deg, rgba(2, 4, 9, .86) 0%, rgba(2, 4, 9, .5) 36%, rgba(2, 4, 9, 0) 60%); }
.hero-inner { position: relative; z-index: 1; padding-top: 60px; }
.hero h1 { font-size: 72px; line-height: 1.16; font-weight: 800; letter-spacing: .02em; text-shadow: 0 2px 24px rgba(0, 0, 0, .4); }
.hero-lead { max-width: 28em; margin-top: 24px; font-size: 19px; line-height: 1.8; color: rgba(255, 255, 255, .86); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 44px; }
.hero-note { position: absolute; left: 0; right: 0; bottom: 30px; z-index: 1; display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255, 255, 255, .86); text-shadow: 0 1px 10px rgba(0, 0, 0, .9); }
.hero-note svg { flex: none; color: var(--accent); }

.perks { margin-top: 32px; }
.perks-bar { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); padding: 28px 16px; background: var(--gray); border-radius: 12px; }
.perk { display: flex; align-items: center; justify-content: center; gap: 14px; font-size: 18px; font-weight: 600; }
.perk svg { flex: none; }

/* 通用分区 */
.section { padding-top: 96px; padding-bottom: 96px; }
.section--gray { background: var(--gray); }
.sec-title { margin-bottom: 48px; text-align: center; font-size: 40px; line-height: 1.3; font-weight: 800; letter-spacing: .02em; }
.sec-title + .sec-sub { margin: -32px auto 48px; max-width: 40em; text-align: center; font-size: 17px; color: var(--muted); }

/* 业务大图卡 */
.tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.tile { position: relative; display: block; height: 360px; padding: 40px 44px; overflow: hidden; color: #fff; border-radius: 12px; background: radial-gradient(90% 120% at 78% 108%, var(--glow, #1B3B6B) 0%, #0A0F1B 52%, #04060B 100%); }
.tile h3 { font-size: 26px; line-height: 1.3; font-weight: 800; letter-spacing: .02em; }
.tile p { max-width: 50%; margin-top: 12px; font-size: 15px; line-height: 1.75; color: rgba(255, 255, 255, .74); }
.tile-more { position: absolute; left: 44px; bottom: 36px; display: inline-flex; align-items: center; gap: 4px; font-size: 15px; font-weight: 700; color: var(--accent); }
.tile-art { position: absolute; right: 9%; bottom: -64px; width: 30%; overflow: hidden; border: 3px solid rgba(255, 255, 255, .92); border-radius: 16px; box-shadow: 0 30px 60px rgba(0, 0, 0, .6); transform: rotate(8deg); transition: transform .35s cubic-bezier(.2, .7, .2, 1); }
.tile-art svg, .tile-art img { display: block; width: 100%; height: auto; }
a.tile:hover .tile-art { transform: rotate(5deg) translateY(-14px); }
.tile--tall { height: 400px; }
.tile--tall p { font-size: 16px; }

/* 首页公司介绍 */
.about { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 80px; align-items: center; }
.about h2 { font-size: 40px; line-height: 1.3; font-weight: 800; letter-spacing: .02em; }
.about-text p { margin-top: 20px; font-size: 17px; color: var(--muted); }
.about-text .btn { margin-top: 36px; }

.cert { position: relative; padding: 44px 48px; overflow: hidden; color: #fff; border-radius: 16px; background: radial-gradient(80% 120% at 100% 0%, #0E3D5C 0%, #070B13 55%, #04060B 100%); }
.cert-waves { position: absolute; right: -40px; bottom: -30px; width: 360px; color: var(--accent); opacity: .22; }
.cert-head { position: relative; display: flex; align-items: center; gap: 12px; font-size: 17px; font-weight: 700; }
.cert-head svg { color: var(--accent); }
.cert-no { position: relative; margin-top: 18px; font-family: var(--num); font-size: 34px; line-height: 1.3; font-weight: 700; letter-spacing: .02em; }
.cert-grid { position: relative; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 32px; margin-top: 32px; padding-top: 28px; border-top: 1px solid rgba(255, 255, 255, .16); }
.cert-grid dt { font-size: 13px; color: rgba(255, 255, 255, .6); }
.cert-grid dd { margin-top: 2px; font-size: 16px; font-weight: 600; }
.cert-grid .wide { grid-column: 1 / -1; }
.cert--full .cert-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 通栏数据带 */
.band { position: relative; height: 440px; overflow: hidden; color: #fff; background: #fff; }
.band-half { position: absolute; top: 0; bottom: 0; left: 0; right: 0; }
.band-a { background: linear-gradient(135deg, #24B4E6 0%, #0B5C91 42%, #031A30 100%); clip-path: polygon(0 0, calc(40% - 3px) 0, calc(68% - 3px) 100%, 0 100%); }
.band-b { background: linear-gradient(225deg, #0D4A78 0%, #04162B 55%, #010409 100%); clip-path: polygon(calc(40% + 3px) 0, 100% 0, 100% 100%, calc(68% + 3px) 100%); }
.band-a svg { position: absolute; left: 0; bottom: 0; width: 70%; color: #fff; opacity: .16; }
.band-b::before { content: ""; position: absolute; top: 0; right: 0; width: 60%; height: 100%; background-image: radial-gradient(rgba(28, 210, 255, .5) 1.3px, transparent 1.8px); background-size: 22px 22px; -webkit-mask-image: radial-gradient(60% 70% at 70% 60%, #000 0%, transparent 100%); mask-image: radial-gradient(60% 70% at 70% 60%, #000 0%, transparent 100%); }
.band-stat { position: absolute; z-index: 1; }
.band-a .band-stat { left: 6%; bottom: 56px; }
.band-b .band-stat { right: 6%; top: 60px; text-align: left; }
.band-stat span { display: block; font-size: 24px; letter-spacing: .12em; color: rgba(255, 255, 255, .88); }
.band-stat strong { display: flex; align-items: baseline; gap: 12px; font-size: 44px; line-height: 1.2; font-weight: 800; }
.band-stat b { font-family: var(--num); font-size: 96px; line-height: 1; font-weight: 700; }

/* 制作流程 */
.steps { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
.step { padding: 28px 24px 30px; background: var(--gray); border-radius: 12px; }
.section--gray .step { background: #fff; }
.step-no { display: block; font-family: var(--num); font-size: 40px; line-height: 1; font-weight: 700; }
.step-no::after { content: ""; display: block; width: 28px; height: 4px; margin-top: 12px; background: var(--accent); border-radius: 2px; }
.step h3 { margin-top: 18px; font-size: 19px; font-weight: 700; }
.step p { margin-top: 8px; font-size: 14px; line-height: 1.7; color: var(--muted); }

.flow { display: grid; gap: 12px; }
.flow-item { display: grid; grid-template-columns: 96px minmax(0, 3fr) minmax(0, 8fr); gap: 0 24px; align-items: center; padding: 26px 36px; background: #fff; border-radius: 12px; }
.flow-no { font-family: var(--num); font-size: 44px; line-height: 1; font-weight: 700; }
.flow-item h3 { font-size: 20px; font-weight: 700; }
.flow-item p { color: var(--muted); }

/* 品牌色块 */
.assure { position: relative; overflow: hidden; color: #000; background: var(--accent); }
.assure::before { content: ""; position: absolute; left: 50%; top: 50%; width: 1800px; height: 1800px; margin: -900px 0 0 -900px; border-radius: 50%; background: radial-gradient(circle, rgba(255, 255, 255, .34) 0 22%, rgba(255, 255, 255, .22) 22% 38%, rgba(255, 255, 255, .12) 38% 56%, transparent 56%); }
.assure-inner { position: relative; padding-top: 96px; padding-bottom: 96px; text-align: center; }
.assure h2 { font-size: 44px; line-height: 1.3; font-weight: 800; letter-spacing: .04em; }
.assure-lead { max-width: 36em; margin: 16px auto 0; font-size: 18px; color: rgba(0, 0, 0, .74); }
.assure-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 48px; text-align: left; }
.assure-grid li { padding: 32px 32px 34px; background: rgba(255, 255, 255, .92); border-radius: 12px; }
.assure-grid h3 { margin-top: 18px; font-size: 21px; font-weight: 800; }
.assure-grid p { margin-top: 8px; font-size: 15px; color: var(--muted); }
.assure .btn { margin-top: 44px; }

.cta { text-align: center; }
.cta h2 { font-size: 36px; line-height: 1.3; font-weight: 800; }
.cta p { max-width: 34em; margin: 14px auto 0; font-size: 17px; color: var(--muted); }
.cta .btn { margin-top: 32px; }

/* 内页标题区 */
.page-head { position: relative; overflow: hidden; color: #fff; background: radial-gradient(70% 160% at 88% 110%, #0E4A70 0%, #070C15 55%, #03050A 100%); }
.page-head .wrap { position: relative; padding-top: 72px; padding-bottom: 76px; }
.page-head-waves { position: absolute; right: -60px; bottom: -40px; width: 620px; color: var(--accent); opacity: .28; }
.crumb { display: flex; gap: 8px; font-size: 14px; color: rgba(255, 255, 255, .62); }
.crumb a:hover { color: var(--accent); }
.page-head h1 { margin-top: 16px; font-size: 54px; line-height: 1.25; font-weight: 800; letter-spacing: .03em; }
.page-lead { max-width: 44em; margin-top: 12px; font-size: 18px; color: rgba(255, 255, 255, .78); }

.split { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 72px; }
.split h2 { font-size: 36px; line-height: 1.3; font-weight: 800; }
.prose p { font-size: 17px; line-height: 1.9; color: #3A4050; }
.prose p + p { margin-top: 1.2em; }

.values { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.value { padding: 36px 36px 38px; background: #fff; border-radius: 12px; }
.value h3 { margin-top: 20px; font-size: 22px; font-weight: 800; }
.value p { margin-top: 8px; color: var(--muted); }

.rows { background: var(--gray); border-radius: 12px; padding: 12px 40px; }
.row { display: grid; grid-template-columns: 28px 140px minmax(0, 1fr); gap: 20px; align-items: center; padding: 24px 0; border-top: 1px solid var(--line); }
.row:first-child { border-top: 0; }
.row dt { font-size: 15px; color: var(--muted); }
.row dd { font-size: 18px; font-weight: 600; }
.row dd a:hover { text-decoration: underline; }
.num { font-family: var(--num); letter-spacing: .01em; }

.notes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.note { padding: 40px 44px 44px; background: #fff; border-radius: 12px; }
.note h2 { margin-top: 20px; font-size: 24px; font-weight: 800; }
.note p { margin-top: 12px; color: var(--muted); }
.note p a { color: var(--ink); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

/* 制度与协议正文 */
.doc { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 64px; align-items: start; padding-top: 72px; padding-bottom: 104px; }
.doc-toc { position: sticky; top: 108px; padding: 24px 12px; background: var(--gray); border-radius: 12px; font-size: 15px; }
.doc-toc h2 { padding: 0 16px; margin-bottom: 8px; font-size: 13px; font-weight: 400; color: var(--faint); }
.doc-toc a { display: block; padding: 8px 16px; border-radius: 8px; font-weight: 500; }
.doc-toc a:hover { background: #fff; }
.doc-body { max-width: 800px; }
.doc-meta { font-size: 14px; color: var(--faint); }
.doc-body h2 { margin-top: 56px; font-size: 26px; line-height: 1.4; font-weight: 800; }
.doc-body .doc-meta + h2 { margin-top: 24px; }
.doc-body p { margin-top: 16px; font-size: 16px; line-height: 1.9; color: #3A4050; }
.doc-body p b { color: var(--ink); font-weight: 700; }
.doc-body .clauses { margin-top: 12px; }
.doc-body .clauses li { padding-left: 3em; text-indent: -3em; line-height: 1.9; color: #3A4050; }
.doc-body .clauses li + li { margin-top: 4px; }
.doc-body a { color: var(--ink); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

/* 页脚 */
.site-footer { background: #000; font-size: 15px; color: rgba(255, 255, 255, .68); }
.footer-main { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 2fr) minmax(0, 2fr); gap: 64px; padding-top: 72px; padding-bottom: 56px; }
.site-footer .brand-name { color: #fff; }
.footer-about { max-width: 30em; margin-top: 22px; }
.footer-addr { margin-top: 8px; }
.site-footer h2 { margin-bottom: 14px; font-size: 16px; font-weight: 700; color: #fff; }
.footer-links a { display: block; padding: 5px 0; }
.site-footer a:hover { color: var(--accent); }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 6px 36px; padding-top: 24px; padding-bottom: 30px; border-top: 1px solid rgba(255, 255, 255, .16); font-size: 14px; color: rgba(255, 255, 255, .6); }

@media (max-width: 1100px) {
  .hero h1 { font-size: 56px; }
  .tile { padding: 32px; }
  .tile-more { left: 32px; bottom: 28px; }
  .about { grid-template-columns: 1fr; gap: 44px; }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .perks-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 0; }
  .perk { justify-content: flex-start; padding-left: 12%; }
  .split { grid-template-columns: 1fr; gap: 24px; }
  .cert--full .cert-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc { grid-template-columns: 1fr; gap: 36px; padding-top: 44px; }
  .doc-toc { position: static; }
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; }
  .footer-brand { grid-column: 1 / -1; }
  .band-stat b { font-size: 76px; }
  .band-stat strong { font-size: 34px; }
}

@media (max-width: 1000px) {
  .hero { align-items: flex-start; }
  .hero-art { top: auto; bottom: 0; height: 60%; object-position: 86% 60%; }
  .hero::after { background: linear-gradient(180deg, rgba(3, 5, 11, 1) 0%, rgba(3, 5, 11, 1) 40%, rgba(3, 5, 11, 0) 60%); }
  .hero-inner { padding-top: 128px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 0 24px; background: #000; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 14px 48px; font-size: 18px; }
  .site-nav .nav-cta { margin: 14px 48px 0; text-align: center; }
  .site-header.is-open { background: #000; }
  .tiles, .notes { grid-template-columns: 1fr; }
  .values, .assure-grid { grid-template-columns: 1fr; }
  .flow-item { grid-template-columns: 64px minmax(0, 1fr); padding: 24px 28px; }
  .flow-item p { grid-column: 2; margin-top: 4px; }
  .flow-no { font-size: 36px; }
  .band { height: auto; background: none; }
  .band-half { position: relative; height: 240px; clip-path: none; }
  .band-a .band-stat, .band-b .band-stat { left: 48px; right: auto; top: auto; bottom: 40px; }
}

@media (max-width: 640px) {
  .wrap { padding-left: 20px; padding-right: 20px; }
  .header-inner { height: 64px; }
  main { padding-top: 64px; }
  .brand-mark { width: 30px; height: 30px; }
  .brand-name { font-size: 19px; }
  .site-nav a { padding: 14px 20px; }
  .site-nav .nav-cta { margin: 14px 20px 0; }
  .hero { height: 86vh; min-height: 560px; }
  .hero::after { background: linear-gradient(180deg, rgba(3, 5, 11, 1) 0%, rgba(3, 5, 11, 1) 36%, rgba(3, 5, 11, 0) 58%); }
  .hero-art { height: 64%; }
  .hero-inner { padding-top: 104px; }
  .hero h1 { font-size: 40px; }
  .hero-lead { margin-top: 16px; font-size: 16px; }
  .hero-actions { margin-top: 28px; gap: 12px; }
  .btn--lg { min-height: 52px; padding: 0 28px; font-size: 16px; }
  .hero-note { bottom: 20px; font-size: 12px; }
  .perks { margin-top: 20px; }
  .perks-bar { grid-template-columns: 1fr; gap: 16px; padding: 22px 24px; }
  .perk { padding-left: 0; font-size: 16px; }
  .section { padding-top: 60px; padding-bottom: 60px; }
  .sec-title { margin-bottom: 28px; font-size: 28px; }
  .sec-title + .sec-sub { margin: -16px auto 28px; font-size: 15px; }
  .tile { height: 300px; padding: 26px 24px; }
  .tile h3 { font-size: 22px; }
  .tile p { max-width: 58%; font-size: 14px; }
  .tile-more { left: 24px; bottom: 24px; }
  .tile-art { right: 5%; width: 34%; bottom: -40px; }
  .tile--tall { height: 380px; }
  .tile--tall p { font-size: 14px; }
  .about h2, .split h2 { font-size: 28px; }
  .about-text p, .prose p { font-size: 16px; }
  .cert { padding: 30px 26px; }
  .cert-no { font-size: 25px; }
  .cert-grid, .cert--full .cert-grid { grid-template-columns: 1fr; gap: 18px; }
  .band-half { height: 200px; }
  .band-a .band-stat, .band-b .band-stat { left: 20px; bottom: 28px; }
  .band-stat span { font-size: 17px; }
  .band-stat b { font-size: 60px; }
  .band-stat strong { font-size: 26px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .step { padding: 22px 18px 24px; }
  .step-no { font-size: 32px; }
  .step h3 { font-size: 17px; }
  .flow-item { grid-template-columns: 48px minmax(0, 1fr); padding: 20px; gap: 0 12px; }
  .flow-no { font-size: 28px; }
  .assure-inner { padding-top: 60px; padding-bottom: 60px; }
  .assure h2 { font-size: 30px; }
  .assure-lead { font-size: 16px; }
  .assure-grid { margin-top: 32px; gap: 12px; }
  .assure-grid li { padding: 24px; }
  .cta h2 { font-size: 26px; }
  .page-head .wrap { padding-top: 40px; padding-bottom: 44px; }
  .page-head h1 { font-size: 34px; }
  .page-lead { font-size: 16px; }
  .page-head-waves { width: 360px; }
  .value { padding: 26px 24px 28px; }
  .rows { padding: 6px 22px; }
  .row { grid-template-columns: 24px minmax(0, 1fr); gap: 4px 14px; padding: 18px 0; }
  .row dd { grid-column: 2; font-size: 16px; }
  .note { padding: 28px 24px 30px; }
  .doc { padding-bottom: 64px; }
  .doc-body h2 { margin-top: 40px; font-size: 22px; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; padding-top: 48px; padding-bottom: 36px; }
  .footer-bottom { flex-direction: column; }
}