:root {
  color-scheme: dark;
  --bg: #08131c;
  --bg-deep: #050c12;
  --surface: rgba(14, 31, 43, .78);
  --surface-solid: #10232f;
  --surface-soft: rgba(255, 255, 255, .035);
  --line: rgba(212, 224, 229, .15);
  --line-strong: rgba(211, 173, 103, .4);
  --text: #f1eee7;
  --muted: #9eabb2;
  --gold: #d3ad67;
  --gold-bright: #eccb8b;
  --cyan: #70b8c4;
  --shadow: 0 24px 80px rgba(0, 0, 0, .32);
  --page: min(1240px, calc(100vw - 64px));
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f1eee7;
  --bg-deep: #e6e1d6;
  --surface: rgba(251, 249, 243, .82);
  --surface-solid: #fbf9f3;
  --surface-soft: rgba(8, 27, 39, .035);
  --line: rgba(8, 27, 39, .14);
  --line-strong: rgba(147, 105, 39, .38);
  --text: #0a1b26;
  --muted: #65737a;
  --gold: #9d722d;
  --gold-bright: #765019;
  --cyan: #287b88;
  --shadow: 0 24px 70px rgba(33, 44, 48, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; overflow-x: hidden; background: var(--bg); color: var(--text); font-family: "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; }
body::before { content: ""; position: fixed; inset: 0; z-index: -3; pointer-events: none; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 88px 88px; opacity: .18; mask-image: linear-gradient(to bottom, #000 0, transparent 72%); }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin-top: 0; }
.skip-link { position: fixed; z-index: 100; left: 16px; top: 12px; padding: 10px 16px; background: var(--text); color: var(--bg); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.ambient { position: fixed; inset: 0; overflow: hidden; z-index: -2; pointer-events: none; }
.ambient i { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .14; }
.ambient i:nth-child(1) { width: 500px; height: 500px; top: -230px; right: -120px; background: var(--gold); }
.ambient i:nth-child(2) { width: 420px; height: 420px; left: -220px; top: 36%; background: var(--cyan); opacity: .09; }
.ambient i:nth-child(3) { width: 300px; height: 300px; right: 12%; bottom: -180px; background: var(--gold); opacity: .08; }

.topbar { width: var(--page); height: 86px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); position: relative; z-index: 30; }
.brand { display: inline-flex; align-items: center; gap: 13px; min-width: max-content; }
.brand > span:last-child { display: flex; flex-direction: column; line-height: 1.1; }
.brand b { font-size: 17px; letter-spacing: .12em; }
.brand small { color: var(--muted); font-size: 8px; letter-spacing: .19em; margin-top: 6px; }
.brand-mark { width: 36px; height: 36px; border: 1px solid var(--line-strong); position: relative; transform: rotate(30deg); display: grid; place-items: center; }
.brand-mark::before { content: ""; width: 20px; height: 20px; border: 1px solid var(--gold); }
.brand-mark i { position: absolute; width: 4px; height: 4px; background: var(--gold); border-radius: 50%; }
.brand-mark i:nth-child(1) { top: 4px; left: 4px; }.brand-mark i:nth-child(2) { right: 4px; top: 4px; }.brand-mark i:nth-child(3) { bottom: 4px; right: 4px; }
.nav { display: flex; gap: 34px; align-items: center; }
.nav a { color: var(--muted); font-size: 13px; transition: color .2s ease; }
.nav a:hover { color: var(--text); }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle, .menu-toggle { border: 1px solid var(--line); background: transparent; cursor: pointer; }
.theme-toggle { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; }
.theme-toggle span { width: 16px; height: 16px; border: 1px solid var(--gold); border-radius: 50%; box-shadow: -5px -3px 0 -2px var(--bg), -6px -3px 0 -2px var(--gold); }
.nav-cta { padding: 10px 18px; border: 1px solid var(--gold); color: var(--gold-bright); font-size: 13px; transition: .2s ease; }
.nav-cta:hover { background: var(--gold); color: var(--bg-deep); }
.menu-toggle { display: none; width: 44px; height: 44px; position: relative; }
.menu-toggle i { position: absolute; left: 11px; width: 20px; height: 1px; background: var(--text); transition: .2s ease; }
.menu-toggle i:first-child { top: 17px; }.menu-toggle i:last-child { top: 25px; }
.menu-toggle[aria-expanded="true"] i:first-child { transform: translateY(4px) rotate(45deg); }.menu-toggle[aria-expanded="true"] i:last-child { transform: translateY(-4px) rotate(-45deg); }

.hero { width: var(--page); min-height: 720px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(420px, .92fr); gap: 72px; align-items: center; padding: 76px 0 88px; }
.eyebrow, .section-kicker { color: var(--gold); font-size: 11px; font-weight: 700; letter-spacing: .17em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 25px; }
.eyebrow span { width: 38px; height: 1px; background: var(--gold); position: relative; }
.eyebrow span::after { content: ""; position: absolute; right: 0; top: -2px; width: 5px; height: 5px; background: var(--gold); border-radius: 50%; }
.hero h1, .section-heading h2, .scenario-intro h2, .standards h2, .contact-copy h2 { font-family: "Songti SC", "STSong", serif; letter-spacing: -.045em; line-height: 1.18; }
.hero h1 { font-size: clamp(54px, 6vw, 86px); margin-bottom: 28px; }
.hero h1 em { color: var(--gold-bright); font-style: normal; }
.hero-lead { max-width: 650px; color: var(--muted); font-size: 17px; line-height: 1.95; }
.hero-actions { display: flex; gap: 12px; margin: 38px 0 46px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 24px; padding: 0 24px; font-size: 14px; font-weight: 600; border: 1px solid var(--line); transition: transform .2s ease, background .2s ease, color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--gold); border-color: var(--gold); color: #10171a; }
.button-secondary { background: var(--surface-soft); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.hero-facts li { border-left: 1px solid var(--line-strong); padding-left: 14px; display: flex; flex-direction: column; }
.hero-facts b { font-size: 13px; }.hero-facts span { color: var(--muted); font-size: 11px; margin-top: 4px; }

.hero-system { min-height: 520px; border: 1px solid var(--line); background: linear-gradient(145deg, var(--surface), transparent); box-shadow: var(--shadow); position: relative; overflow: hidden; }
.hero-system::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(135deg, transparent 0 17px, var(--surface-soft) 17px 18px); opacity: .7; }
.system-head { height: 58px; border-bottom: 1px solid var(--line); padding: 0 20px; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 9px; letter-spacing: .18em; }
.system-head small { letter-spacing: .04em; }
.system-orbit { height: 385px; position: relative; display: grid; place-items: center; }
.orbit-ring { position: absolute; border: 1px solid var(--line); border-radius: 50%; }
.ring-one { width: 270px; height: 270px; animation: spin 24s linear infinite; border-top-color: var(--gold); }
.ring-two { width: 190px; height: 190px; border-style: dashed; animation: spin 18s linear infinite reverse; }
.system-core { width: 108px; height: 108px; border: 1px solid var(--line-strong); background: var(--surface-solid); border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-direction: column; box-shadow: 0 0 50px rgba(211, 173, 103, .16); position: relative; }
.system-core i { position: absolute; inset: -8px; border: 1px solid var(--line); border-radius: 50%; }
.system-core strong { font-family: "Songti SC", "STSong", serif; font-size: 23px; }.system-core small { color: var(--gold); font-size: 8px; letter-spacing: .25em; margin-top: 5px; }
.orbit-node { position: absolute; min-width: 84px; padding: 8px 11px; border: 1px solid var(--line); background: var(--bg); font-size: 12px; box-shadow: 0 8px 26px rgba(0, 0, 0, .16); }
.orbit-node b { color: var(--gold); font-size: 9px; margin-right: 8px; }.node-a { top: 60px; left: 45px; }.node-b { top: 80px; right: 35px; }.node-c { bottom: 58px; right: 50px; }.node-d { bottom: 72px; left: 30px; }
.system-status { height: 76px; border-top: 1px solid var(--line); display: grid; grid-template-columns: repeat(3, 1fr); align-items: center; }
.system-status span { color: var(--muted); font-size: 10px; text-align: center; }.system-status i { width: 5px; height: 5px; margin-right: 7px; border-radius: 50%; background: var(--cyan); display: inline-block; box-shadow: 0 0 10px var(--cyan); }
@keyframes spin { to { transform: rotate(360deg); } }

.trust-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-strip div { min-height: 122px; padding: 28px max(24px, calc((100vw - 1240px) / 8)); display: grid; grid-template-columns: 28px 1fr; align-content: center; border-right: 1px solid var(--line); }
.trust-strip div:last-child { border-right: 0; }.trust-strip span { grid-row: span 2; color: var(--gold); font-size: 10px; }.trust-strip b { font-size: 14px; }.trust-strip small { color: var(--muted); font-size: 10px; }
.section { width: var(--page); margin: 0 auto; padding: 128px 0; }
.section-heading { max-width: 760px; margin-bottom: 58px; }
.section-kicker { margin-bottom: 18px; }
.section-heading h2, .scenario-intro h2, .standards h2, .contact-copy h2 { font-size: clamp(36px, 4.6vw, 59px); margin-bottom: 22px; }
.section-heading > p:last-child, .scenario-intro > p:last-child, .contact-copy > p:last-child { color: var(--muted); max-width: 620px; }

.service-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.service-card { min-height: 390px; padding: 38px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); position: relative; overflow: hidden; background: var(--surface-soft); }
.service-card::after { content: ""; position: absolute; width: 220px; height: 220px; border: 1px solid var(--line); border-radius: 50%; right: -110px; bottom: -110px; transition: transform .4s ease; }
.service-card:hover::after { transform: scale(1.15); }
.service-featured { background: linear-gradient(145deg, rgba(211,173,103,.12), var(--surface-soft)); }
.service-no { position: absolute; right: 28px; top: 24px; color: var(--line-strong); font-family: "Songti SC", "STSong", serif; font-size: 36px; }
.service-icon { height: 80px; width: 96px; margin-bottom: 28px; position: relative; }
.service-icon i { position: absolute; border: 1px solid var(--gold); }
.service-icon.mini i:nth-child(1) { width: 48px; height: 62px; left: 12px; top: 8px; border-radius: 12px; }.service-icon.mini i:nth-child(2) { width: 22px; height: 22px; right: 6px; top: 6px; border-radius: 50%; }.service-icon.mini i:nth-child(3) { width: 28px; height: 1px; left: 22px; bottom: 18px; }
.service-icon.web i:first-child { inset: 8px 0 7px; }.service-icon.web i:last-child { width: 40px; height: 1px; top: 23px; left: 0; box-shadow: 12px 14px 0 var(--line-strong), 28px 28px 0 var(--line-strong); }
.service-icon.desktop i:first-child { inset: 7px 1px 20px; }.service-icon.desktop i:last-child { width: 45px; height: 12px; border-top: 0; left: 26px; bottom: 8px; transform: skew(-18deg); }
.service-icon.data i:nth-child(1) { width: 70px; height: 22px; border-radius: 50%; left: 8px; top: 8px; }.service-icon.data i:nth-child(2) { width: 70px; height: 50px; border-top: 0; left: 8px; top: 19px; }.service-icon.data i:nth-child(3) { width: 70px; height: 20px; border-radius: 50%; left: 8px; bottom: 8px; }
.service-label { color: var(--gold); font-size: 9px; letter-spacing: .18em; margin-bottom: 9px; }.service-card h3 { font-size: 23px; margin-bottom: 12px; }.service-card > p:not(.service-label) { color: var(--muted); max-width: 470px; }
.service-card ul { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }.service-card li { border: 1px solid var(--line); padding: 5px 10px; color: var(--muted); font-size: 10px; }

.scenarios { display: grid; grid-template-columns: .75fr 1.25fr; gap: 90px; align-items: start; }
.scenario-intro { position: sticky; top: 120px; }.scenario-board { border-top: 1px solid var(--line); }
.scenario-board article { display: grid; grid-template-columns: 50px 1fr auto; gap: 20px; align-items: start; padding: 30px 0; border-bottom: 1px solid var(--line); }
.scenario-board article > span { color: var(--gold); font-size: 10px; }.scenario-board h3 { font-size: 19px; margin-bottom: 8px; }.scenario-board p { color: var(--muted); margin: 0; font-size: 13px; }.scenario-board small { color: var(--gold); font-size: 8px; letter-spacing: .18em; border: 1px solid var(--line-strong); padding: 5px 8px; }

.process { border-top: 1px solid var(--line); }
.process-list { display: grid; grid-template-columns: repeat(5, 1fr); border-left: 1px solid var(--line); }
.process-list li { min-height: 300px; padding: 25px; border: 1px solid var(--line); border-left: 0; display: flex; flex-direction: column; }
.process-list li > span { color: var(--gold); font-family: "Songti SC", "STSong", serif; font-size: 31px; opacity: .6; }.process-list li div { margin-top: auto; }.process-list h3 { font-size: 18px; }.process-list p { color: var(--muted); font-size: 12px; }.process-list small { color: var(--gold); font-size: 9px; letter-spacing: .15em; padding-top: 18px; border-top: 1px solid var(--line); }
.standards { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; border-top: 1px solid var(--line); }
.standard-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.standard-grid article { padding: 30px; min-height: 190px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }.standard-grid b { color: var(--gold-bright); font-size: 17px; }.standard-grid p { color: var(--muted); font-size: 12px; margin: 18px 0 0; }

.contact-section { width: var(--page); min-height: 530px; margin: 30px auto 110px; padding: 74px; border: 1px solid var(--line-strong); display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 70px; position: relative; overflow: hidden; background: linear-gradient(135deg, rgba(211,173,103,.08), var(--surface)); }
.contact-glow { position: absolute; width: 420px; height: 420px; border: 1px solid var(--line-strong); border-radius: 50%; right: -180px; top: -200px; box-shadow: 0 0 90px rgba(211,173,103,.08); }
.contact-card { border-left: 1px solid var(--line-strong); padding-left: 46px; display: flex; align-items: flex-start; flex-direction: column; position: relative; z-index: 1; }.contact-card > span { color: var(--muted); font-size: 11px; }.contact-card > a:not(.button) { font-family: "Songti SC", "STSong", serif; font-size: clamp(22px, 2.5vw, 34px); color: var(--gold-bright); margin: 12px 0 18px; }.contact-card p { color: var(--muted); font-size: 11px; }.contact-card .button { margin-top: 15px; }
.footer { border-top: 1px solid var(--line); width: var(--page); margin: 0 auto; padding: 46px 0 30px; }.footer-main { display: grid; grid-template-columns: auto 1fr auto; gap: 45px; align-items: center; }.footer-main > p { color: var(--muted); margin: 0; font-size: 12px; }.footer-main nav { display: flex; gap: 22px; color: var(--muted); font-size: 11px; }.footer-main nav a:hover { color: var(--text); }.footer-bottom { margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 9px; letter-spacing: .06em; display: flex; justify-content: space-between; }.footer-bottom a:hover { color: var(--gold); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }.reveal.in-view { opacity: 1; transform: translateY(0); }.hero .reveal:first-child { transition-delay: .06s; }.hero .reveal:last-child { transition-delay: .18s; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 4px; }

.legal-page { min-height: 100vh; }.legal-shell { width: min(800px, calc(100vw - 40px)); margin: 0 auto; padding: 90px 0 120px; }.legal-shell > a { color: var(--gold); font-size: 12px; }.legal-shell h1 { font-family: "Songti SC", "STSong", serif; font-size: clamp(38px, 6vw, 64px); margin: 35px 0 16px; }.legal-updated { color: var(--muted); font-size: 11px; border-bottom: 1px solid var(--line); padding-bottom: 30px; }.legal-content { padding-top: 35px; }.legal-content h2 { font-size: 18px; margin: 35px 0 10px; }.legal-content p, .legal-content li { color: var(--muted); font-size: 13px; }.legal-content ul { list-style: disc; padding-left: 20px; }

@media (max-width: 1080px) {
  :root { --page: min(100% - 40px, 920px); }
  .nav { gap: 20px; }.hero { grid-template-columns: 1fr 420px; gap: 36px; }.hero h1 { font-size: 56px; }.hero-facts { grid-template-columns: 1fr; }.hero-facts li { min-height: 42px; }.process-list { grid-template-columns: repeat(3, 1fr); }.standards { gap: 45px; }.contact-section { padding: 55px; }
}

@media (max-width: 820px) {
  :root { --page: calc(100vw - 32px); }
  .topbar { height: 72px; }.nav { position: absolute; top: 72px; left: 0; right: 0; display: grid; gap: 0; padding: 8px; background: var(--surface-solid); border: 1px solid var(--line); box-shadow: var(--shadow); transform: translateY(-12px); opacity: 0; visibility: hidden; transition: .2s ease; }.nav.is-open { opacity: 1; transform: translateY(0); visibility: visible; }.nav a { min-height: 48px; display: flex; align-items: center; padding: 0 14px; border-bottom: 1px solid var(--line); }.nav a:last-child { border-bottom: 0; }.menu-toggle { display: block; }.nav-cta { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding: 70px 0; }.hero-system { min-height: 480px; }.hero h1 { font-size: clamp(45px, 11vw, 66px); }.trust-strip { grid-template-columns: repeat(2, 1fr); }.trust-strip div:nth-child(2) { border-right: 0; }.trust-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section { padding: 95px 0; }.service-grid { grid-template-columns: 1fr; }.scenarios { grid-template-columns: 1fr; gap: 45px; }.scenario-intro { position: static; }.process-list { grid-template-columns: repeat(2, 1fr); }.standards { grid-template-columns: 1fr; }.contact-section { grid-template-columns: 1fr; padding: 48px 36px; gap: 40px; }.contact-card { border-left: 0; border-top: 1px solid var(--line-strong); padding: 35px 0 0; }.footer-main { grid-template-columns: 1fr; gap: 22px; }
}

@media (max-width: 520px) {
  :root { --page: calc(100vw - 24px); }.brand b { font-size: 15px; }.brand small { font-size: 7px; }.brand-mark { width: 31px; height: 31px; }.theme-toggle { display: none; }
  .hero { padding-top: 54px; gap: 48px; }.hero h1 { font-size: 43px; }.hero-lead { font-size: 14px; }.hero-actions { flex-direction: column; }.hero-actions .button { width: 100%; }.hero-system { min-height: 410px; }.system-orbit { height: 320px; }.ring-one { width: 230px; height: 230px; }.ring-two { width: 155px; height: 155px; }.system-core { width: 90px; height: 90px; }.node-a { top: 44px; left: 18px; }.node-b { top: 62px; right: 14px; }.node-c { bottom: 46px; right: 18px; }.node-d { bottom: 58px; left: 12px; }.system-status { height: 66px; }
  .trust-strip { grid-template-columns: 1fr; }.trust-strip div { border-right: 0; border-bottom: 1px solid var(--line); min-height: 100px; padding: 22px 28px; }.trust-strip div:last-child { border-bottom: 0; }
  .section { padding: 78px 0; }.section-heading h2, .scenario-intro h2, .standards h2, .contact-copy h2 { font-size: 34px; }.service-card { min-height: 370px; padding: 30px 24px; }.scenario-board article { grid-template-columns: 38px 1fr; }.scenario-board small { grid-column: 2; justify-self: start; }.process-list, .standard-grid { grid-template-columns: 1fr; }.process-list li { min-height: 230px; }.contact-section { width: 100%; margin-bottom: 70px; padding: 52px 24px; border-left: 0; border-right: 0; }.contact-card > a:not(.button) { font-size: 21px; }.contact-card .button { width: 100%; }.footer { padding-bottom: calc(28px + env(safe-area-inset-bottom)); }.footer-main nav { flex-wrap: wrap; }.footer-bottom { flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }.orbit-ring { animation: none; }.reveal { opacity: 1; transform: none; transition: none; }.button { transition: none; }
}