:root {
  --ink: #0b0d0f;
  --ink-soft: #12171a;
  --paper: #f2f5f6;
  --white: #fff;
  --text: #171c20;
  --muted: #68747b;
  --line: #d5dde0;
  --line-dark: rgba(255, 255, 255, 0.14);
  --cyan: #48d7eb;
  --cyan-dark: #087f91;
  --amber: #d8a84d;
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: clip; }

body {
  margin: 0;
  overflow-x: clip;
  color: var(--text);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; }

.container {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  height: 76px;
  color: var(--white);
  background: rgba(11, 13, 15, 0.96);
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(16px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  margin-right: auto;
  min-width: 0;
}

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border: 1px solid rgba(255,255,255,.7);
}

.brand-mark::before,
.brand-mark::after { content: ""; position: absolute; background: var(--cyan); }
.brand-mark::before { width: 15px; height: 1px; top: 10px; left: 9px; box-shadow: 0 6px 0 var(--cyan), 0 12px 0 var(--cyan); }
.brand-mark::after { width: 1px; height: 22px; top: 5px; left: 16px; opacity: .55; }

.brand-copy { display: grid; white-space: nowrap; }
.brand-copy strong { font-size: 15px; line-height: 1.2; font-weight: 650; }
.brand-copy span { color: rgba(255,255,255,.48); font-size: 9px; line-height: 1.3; text-transform: uppercase; }

.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a { color: rgba(255,255,255,.65); font-size: 14px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--white); }
.nav-contact { min-height: 40px; display: inline-flex; align-items: center; padding: 0 17px; color: #071013 !important; background: var(--cyan); font-weight: 650; }

.page-hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: max(24px, calc((100vw - var(--max)) / 2));
  width: min(36vw, 430px);
  height: 100%;
  border-right: 1px solid rgba(255,255,255,.06);
  border-left: 1px solid rgba(255,255,255,.06);
  box-shadow: -150px 0 0 rgba(255,255,255,.018), 150px 0 0 rgba(255,255,255,.018);
}

.hero-inner { position: relative; z-index: 1; padding: 94px 0 88px; }
.breadcrumb { display: flex; gap: 9px; margin-bottom: 32px; color: rgba(255,255,255,.46); font-size: 12px; }
.breadcrumb a:hover { color: var(--cyan); }
.eyebrow { margin: 0 0 16px; color: var(--cyan); font-size: 12px; font-weight: 700; text-transform: uppercase; }
.page-hero h1 { max-width: 800px; margin: 0; font-size: clamp(40px, 5.4vw, 68px); line-height: 1.16; font-weight: 630; }
.hero-summary { max-width: 690px; margin: 28px 0 0; color: rgba(255,255,255,.62); font-size: 17px; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 0; margin-top: 48px; border-top: 1px solid var(--line-dark); }
.hero-fact { min-width: 190px; padding: 22px 34px 0 0; }
.hero-fact + .hero-fact { padding-left: 34px; border-left: 1px solid var(--line-dark); }
.hero-fact span { display: block; color: rgba(255,255,255,.38); font-size: 10px; text-transform: uppercase; }
.hero-fact strong { display: block; margin-top: 4px; font-size: 15px; font-weight: 560; }

.section { padding: 96px 0; }
.section.white { background: var(--white); }
.section.dark { color: var(--white); background: var(--ink-soft); }
.section-head { display: grid; grid-template-columns: .72fr 1.28fr; gap: 70px; margin-bottom: 52px; }
.section-index { color: var(--cyan-dark); font-size: 12px; font-weight: 700; text-transform: uppercase; }
.dark .section-index { color: var(--cyan); }
.section-head h2 { max-width: 720px; margin: 0; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.3; font-weight: 620; }
.section-head p { max-width: 650px; margin: 18px 0 0; color: var(--muted); }
.dark .section-head p { color: rgba(255,255,255,.52); }

.detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.detail-item { padding: 32px 32px 32px 0; border-bottom: 1px solid var(--line); }
.detail-item:nth-child(even) { padding-left: 32px; border-left: 1px solid var(--line); }
.detail-item span { color: #9aa5aa; font-size: 11px; }
.detail-item h3 { margin: 10px 0 12px; font-size: 22px; font-weight: 620; }
.detail-item p { margin: 0; color: var(--muted); font-size: 14px; }

.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line-dark); }
.principle { min-height: 220px; padding: 30px; border-left: 1px solid var(--line-dark); }
.principle:first-child { border-left: 0; }
.principle span { color: var(--amber); font-size: 11px; text-transform: uppercase; }
.principle h3 { margin: 56px 0 10px; font-size: 21px; font-weight: 590; }
.principle p { margin: 0; color: rgba(255,255,255,.48); font-size: 14px; }

.contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 76px; }
.contact-intro h2 { margin: 12px 0 20px; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.3; }
.contact-intro p { margin: 0; color: var(--muted); }
.contact-list { border-top: 1px solid var(--line); }
.contact-row { display: grid; grid-template-columns: 110px 1fr auto; gap: 24px; align-items: center; min-height: 112px; border-bottom: 1px solid var(--line); }
.contact-label { color: var(--muted); font-size: 12px; }
.contact-value { font-size: clamp(20px, 2.6vw, 30px); font-weight: 580; overflow-wrap: anywhere; }
.contact-action { min-height: 38px; display: inline-flex; align-items: center; padding: 0 14px; color: var(--cyan-dark); background: transparent; border: 1px solid #afbdc3; cursor: pointer; }
.contact-action:hover { color: var(--white); background: var(--cyan-dark); border-color: var(--cyan-dark); }
.copy-status { min-height: 24px; margin: 12px 0 0; color: var(--cyan-dark); font-size: 13px; }

.checklist { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.check-item { padding: 28px 26px 28px 0; border-bottom: 1px solid var(--line); }
.check-item + .check-item { padding-left: 26px; border-left: 1px solid var(--line); }
.check-item strong { display: block; margin-bottom: 8px; font-size: 16px; }
.check-item p { margin: 0; color: var(--muted); font-size: 13px; }

.cta { padding: 70px 0; color: var(--white); background: #0d1114; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.cta h2 { margin: 0; font-size: clamp(27px, 3.2vw, 40px); font-weight: 600; }
.cta p { margin: 10px 0 0; color: rgba(255,255,255,.48); }
.button { min-height: 50px; display: inline-flex; align-items: center; gap: 20px; padding: 0 22px; color: #071013; background: var(--cyan); font-size: 14px; font-weight: 650; white-space: nowrap; }

.site-footer { color: rgba(255,255,255,.48); background: #080a0c; }
.footer-main { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 30px; border-bottom: 1px solid var(--line-dark); }
.footer-main strong { color: var(--white); font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 12px; }
.footer-links a:hover { color: var(--white); }
.footer-bottom { min-height: 62px; display: flex; align-items: center; justify-content: space-between; gap: 22px; font-size: 11px; }

@media (max-width: 820px) {
  .container { width: min(calc(100% - 32px), var(--max)); }
  .site-header { height: auto; min-height: 72px; }
  .header-inner { min-height: 72px; flex-wrap: wrap; gap: 0; padding: 13px 0; }
  .brand-copy span { display: none; }
  .site-nav { width: 100%; order: 2; gap: 18px; padding-top: 12px; overflow-x: auto; }
  .site-nav a { white-space: nowrap; font-size: 13px; }
  .nav-contact { min-height: 34px; padding: 0 12px; }
  .page-hero { min-height: 480px; }
  .hero-inner { padding: 72px 0; }
  .page-hero h1 { font-size: 40px; }
  .hero-inner, .hero-summary, .section-head > *, .contact-grid > * { min-width: 0; max-width: 100%; }
  .page-hero h1, .hero-summary { overflow-wrap: anywhere; }
  .hero-fact { min-width: 0; flex: 1 1 50%; padding-right: 16px; }
  .hero-fact + .hero-fact { padding-left: 16px; }
  .section { padding: 72px 0; }
  .section-head, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .detail-grid, .principle-grid, .checklist { grid-template-columns: 1fr; }
  .detail-item, .detail-item:nth-child(even), .principle, .check-item, .check-item + .check-item { padding: 26px 0; border-left: 0; }
  .principle { min-height: auto; }
  .principle h3 { margin-top: 26px; }
  .contact-row { grid-template-columns: 78px 1fr; gap: 12px; }
  .contact-action { grid-column: 2; justify-self: start; margin-bottom: 20px; }
  .cta-inner, .footer-main, .footer-bottom { align-items: flex-start; flex-direction: column; justify-content: center; }
  .footer-main { min-height: 150px; }
  .footer-bottom { min-height: 96px; gap: 3px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }