:root {
  --ink: #172026;
  --muted: #5d6b73;
  --line: #d9e2e5;
  --paper: #f6f8f7;
  --white: #ffffff;
  --teal: #007c89;
  --teal-dark: #005a63;
  --steel: #233845;
  --mint: #d9f0e7;
  --gold: #f3b33d;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Aptos", "Segoe UI", "Noto Sans", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--teal);
  text-decoration: none;
}

a:hover {
  color: var(--teal-dark);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(23, 32, 38, 0.08);
  background: rgba(246, 248, 247, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(135deg, var(--teal), var(--steel));
  font-weight: 800;
  font-size: 26px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
  font-size: 15px;
}

.site-nav a {
  color: var(--steel);
}

.hero {
  min-height: 86vh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  align-items: center;
  gap: clamp(28px, 5vw, 80px);
  padding: clamp(56px, 8vw, 104px) clamp(20px, 6vw, 92px) 48px;
  background:
    linear-gradient(120deg, rgba(217, 240, 231, 0.82), rgba(246, 248, 247, 0.8) 42%, rgba(243, 179, 61, 0.16)),
    radial-gradient(circle at 10% 10%, rgba(0, 124, 137, 0.16), transparent 28%);
}

.hero h1,
.legal-hero h1 {
  max-width: 760px;
  margin: 0 0 20px;
  font-size: clamp(42px, 7vw, 84px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero p,
.legal-hero p {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid var(--teal);
  border-radius: 6px;
  font-weight: 700;
}

.button.primary {
  color: var(--white);
  background: var(--teal);
}

.button.secondary {
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.62);
}

.device-panel {
  display: grid;
  min-height: 480px;
  place-items: center;
}

.device-screen {
  width: min(100%, 420px);
  aspect-ratio: 0.74;
  padding: 28px;
  border: 1px solid rgba(35, 56, 69, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.95), rgba(217, 240, 231, 0.84)),
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(0, 124, 137, 0.04) 18px 20px);
  box-shadow: 0 26px 70px rgba(35, 56, 69, 0.16);
}

.screen-bar {
  width: 42%;
  height: 10px;
  border-radius: 20px;
  background: var(--steel);
}

.print-preview {
  display: grid;
  gap: 8px;
  margin-top: 54px;
  padding: 32px;
  border: 1px dashed rgba(23, 32, 38, 0.35);
  background: var(--white);
}

.print-preview span {
  color: var(--gold);
  font-weight: 800;
}

.print-preview strong {
  font-size: 34px;
}

.print-preview small {
  color: var(--muted);
}

.print-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.print-controls span {
  height: 46px;
  border-radius: 6px;
  background: var(--steel);
}

.section {
  padding: clamp(52px, 7vw, 96px) clamp(20px, 6vw, 92px);
}

.section-heading {
  margin-bottom: 26px;
}

.section h2,
.legal-section h2,
.support-grid h2,
.faq h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
}

.feature-grid,
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article,
.support-grid article {
  min-height: 210px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature-grid h3,
.support-grid h2 {
  margin-top: 0;
}

.bilingual {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  background: var(--white);
}

.contact-band {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
  color: var(--white);
  background: var(--steel);
}

.contact-band .eyebrow,
.contact-band a {
  color: var(--mint);
}

address {
  display: grid;
  gap: 10px;
  font-style: normal;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 22px clamp(20px, 6vw, 92px);
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.legal-page,
.support-page {
  padding: 0 clamp(20px, 6vw, 92px) 72px;
}

.legal-hero {
  padding: 72px 0 34px;
}

.legal-section {
  max-width: 920px;
  margin: 18px 0;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.legal-section h3 {
  margin: 26px 0 8px;
}

.support-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.faq {
  padding-left: 0;
  padding-right: 0;
}

details {
  max-width: 920px;
  margin: 12px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .bilingual,
  .contact-band,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .hero h1,
  .legal-hero h1 {
    font-size: 44px;
  }

  .device-panel {
    min-height: auto;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}