:root {
  color-scheme: light;
  --ink: #14332d;
  --muted: #5d716c;
  --line: #d8e6e1;
  --paper: #fbfdfc;
  --soft: #e8f4ef;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --yellow: #f5c84b;
  --red: #c44c3f;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(251, 253, 252, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.95rem;
}

.links a {
  color: var(--muted);
  text-decoration: none;
}

.links a:hover {
  color: var(--accent-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
  gap: 44px;
  align-items: center;
  padding: 60px 0 48px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 0.95rem;
  font-weight: 800;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
}

h1 {
  max-width: 12em;
  font-size: clamp(2.3rem, 7vw, 4.8rem);
  letter-spacing: 0;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.1rem;
}

.lead {
  max-width: 38rem;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.12rem;
}

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

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 10px 16px;
  background: var(--accent);
  color: white;
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
}

.phone-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-items: end;
}

.phone {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: 0 18px 40px rgba(20, 51, 45, 0.16);
}

.phone:first-child {
  margin-top: 28px;
}

.band {
  border-top: 1px solid var(--line);
  padding: 42px 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.feature {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: white;
}

.feature p,
.content p,
.content li {
  color: var(--muted);
}

.feature p {
  margin: 10px 0 0;
}

.graphic {
  width: 100%;
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.content {
  max-width: 760px;
  padding: 44px 0 64px;
}

.content h1 {
  max-width: none;
  font-size: 2.4rem;
}

.content h2 {
  margin-top: 34px;
}

.content p,
.content ul {
  margin: 14px 0 0;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer .shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

.footer nav {
  display: flex;
  gap: 14px;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .links {
    justify-content: flex-start;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 38px;
  }

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

  .phone-pair {
    max-width: 420px;
  }
}