:root {
  color-scheme: light;
  --background: #f6f8fa;
  --background-soft: #edf4f2;
  --surface: #ffffff;
  --surface-muted: #f9fbfc;
  --text: #13201b;
  --muted: #64726b;
  --border: #d8e1e6;
  --border-strong: #b9c8d0;
  --primary: #176b4d;
  --primary-pressed: #0f4d37;
  --primary-soft: #e7f3ee;
  --accent: #2366a8;
  --accent-soft: #e8f2fc;
  --care: #8a5a00;
  --care-soft: #fff5df;
  --red: #b3261e;
  --red-soft: #fcedea;
  --orange: #b85c00;
  --orange-soft: #fff3e4;
  --green: #167a3d;
  --green-soft: #eaf7ee;
  --shadow: 0 18px 48px rgba(16, 33, 26, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 12%, rgba(23, 107, 77, 0.13), transparent 26%),
    radial-gradient(circle at 92% 4%, rgba(35, 102, 168, 0.13), transparent 24%),
    linear-gradient(180deg, #fbfdfc 0%, var(--background) 46%, #eff6f2 100%);
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
}

a {
  color: var(--primary);
  font-weight: 900;
  text-decoration: none;
}

a:hover { text-decoration: underline; }

.shell {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid rgba(216, 225, 230, 0.72);
  background: rgba(246, 248, 250, 0.86);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

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

.brand img {
  width: 50px;
  height: 50px;
  border-radius: 16px;
  box-shadow: 0 10px 24px rgba(16, 33, 26, 0.12);
}

.brand-title {
  display: grid;
  gap: 0;
}

.brand-title strong {
  font-size: 22px;
  line-height: 1.15;
}

.brand-title span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.nav-links a {
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--text);
  padding: 9px 14px;
}

.nav-links a:hover {
  background: var(--surface);
  border-color: var(--border);
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.78fr);
  gap: 26px;
  align-items: stretch;
  padding: 42px 0 28px;
}

.panel,
.content-card,
.feature-card,
.status-card,
.mock-phone,
.safety-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.panel {
  border-radius: 32px;
  padding: clamp(26px, 5vw, 54px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid #cfe2d9;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 950;
  letter-spacing: 0.06em;
  padding: 7px 13px;
}

h1,
h2,
h3 {
  color: var(--text);
  letter-spacing: -0.04em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(50px, 8vw, 96px);
  margin: 18px 0 16px;
}

h2 {
  font-size: clamp(32px, 4.6vw, 54px);
  margin: 0 0 16px;
}

h3 {
  font-size: 24px;
  margin: 0 0 8px;
}

p,
li {
  color: var(--muted);
  font-size: 18px;
}

.lead {
  color: var(--primary);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 950;
  line-height: 1.28;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  align-items: center;
  background: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 14px;
  color: var(--surface);
  display: inline-flex;
  font-size: 18px;
  font-weight: 950;
  justify-content: center;
  min-height: 54px;
  padding: 0 22px;
}

.button.secondary {
  background: var(--surface);
  color: var(--primary);
}

.button:hover {
  background: var(--primary-pressed);
  color: var(--surface);
  text-decoration: none;
}

.button.secondary:hover {
  background: var(--primary-soft);
  color: var(--primary);
}

.mock-phone {
  align-self: stretch;
  border-radius: 36px;
  padding: 20px;
}

.phone-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.phone-top h2 {
  font-size: 42px;
  margin: 0;
}

.phone-top p {
  font-weight: 900;
  margin: 0;
}

.app-badge {
  border: 1px solid #cfe2d9;
  border-radius: 22px;
  padding: 10px;
  text-align: center;
}

.app-badge img {
  display: block;
  height: 68px;
  margin: 0 auto 4px;
  width: 68px;
}

.app-badge span {
  color: var(--primary);
  font-weight: 950;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-bottom: 18px;
}

.tabs span,
.tile {
  border: 1px solid var(--border);
  border-radius: 14px;
  font-size: 18px;
  font-weight: 950;
  padding: 12px;
  text-align: center;
}

.tabs span:first-child {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.tile {
  align-items: center;
  display: flex;
  justify-content: center;
  min-height: 92px;
  color: white;
}

.tile.primary { background: var(--primary); border-color: var(--primary); }
.tile.blue { background: var(--accent); border-color: var(--accent); }
.tile.red { background: var(--red); border-color: var(--red); }
.tile.orange { background: var(--orange); border-color: var(--orange); }
.tile.care { background: var(--care); border-color: var(--care); }

.status-card {
  border-radius: 22px;
  margin-top: 16px;
  padding: 18px;
}

.status-card strong {
  color: var(--primary);
  display: block;
  font-size: 25px;
  line-height: 1.25;
  margin-bottom: 4px;
}

.section {
  padding: 36px 0;
}

.feature-grid,
.safety-grid {
  display: grid;
  gap: 18px;
}

.feature-grid {
  grid-template-columns: repeat(3, 1fr);
}

.feature-card,
.safety-card,
.content-card {
  border-radius: 26px;
  padding: 26px;
}

.feature-card strong {
  color: var(--text);
  display: block;
  font-size: 23px;
  font-weight: 950;
  margin-bottom: 8px;
}

.safety-grid {
  grid-template-columns: repeat(4, 1fr);
}

.safety-card {
  box-shadow: none;
}

.safety-card strong {
  display: inline-flex;
  border-radius: 999px;
  color: white;
  font-size: 15px;
  margin-bottom: 14px;
  padding: 6px 12px;
}

.safety-card.red strong { background: var(--red); }
.safety-card.orange strong { background: var(--orange); }
.safety-card.blue strong { background: var(--accent); }
.safety-card.green strong { background: var(--green); }

.page-hero {
  padding: 42px 0 18px;
}

.page-hero h1 {
  font-size: clamp(44px, 6vw, 74px);
  margin-bottom: 10px;
}

.content-card {
  margin: 18px 0 46px;
}

.content-card h2 {
  font-size: 28px;
  margin-top: 34px;
}

.content-card h2:first-child { margin-top: 0; }

.content-card ul {
  padding-left: 1.3em;
}

.notice {
  background: var(--red-soft);
  border-left: 7px solid var(--red);
  border-radius: 18px;
  color: var(--text);
  font-weight: 950;
  padding: 18px 20px;
}

.support-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, 1fr);
  margin: 18px 0 46px;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  padding: 28px 0 44px;
}

@media (max-width: 900px) {
  .hero,
  .feature-grid,
  .safety-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 28px;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 540px) {
  .shell {
    width: min(100% - 24px, 1120px);
  }

  .brand-title span {
    display: none;
  }

  .nav-links a {
    padding: 7px 10px;
  }

  .panel,
  .mock-phone,
  .content-card {
    border-radius: 24px;
    padding: 22px;
  }

  .phone-top {
    align-items: flex-start;
    flex-direction: column;
  }
}