:root {
  --ink: #f5f5f7;
  --muted: #a9a9b3;
  --line: #34343f;
  --panel: #202027;
  --background: #111116;
  --orange: #ff7a00;
  --cyan: #2ad6df;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", "PingFang TC", sans-serif;
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }
main { min-height: 100vh; }

.site-header {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  height: 76px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 0 28px;
}

.brand {
  align-items: center;
  display: flex;
  font-size: 20px;
  font-weight: 700;
  gap: 12px;
}

.brand img { border-radius: 8px; }
nav { display: flex; gap: 28px; }
nav a { color: var(--muted); font-size: 15px; }
nav a:hover, nav a:focus-visible { color: var(--ink); }

.language-bar {
  align-items: center;
  display: flex;
  justify-content: flex-end;
  margin: 0 auto;
  max-width: 1120px;
  padding: 20px 28px 0;
}

.language-bar > span { color: var(--muted); font-size: 13px; margin-right: 12px; }
.language-switcher { background: var(--panel); border: 1px solid var(--line); display: flex; padding: 3px; }

.language-switcher button {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  min-height: 34px;
  padding: 5px 12px;
}

.language-switcher button[aria-pressed="true"] { background: var(--orange); color: #111116; font-weight: 700; }
.language-switcher button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

.intro {
  align-items: center;
  display: grid;
  gap: 72px;
  grid-template-columns: minmax(0, 1fr) 240px;
  margin: 0 auto;
  max-width: 1064px;
  min-height: 520px;
  padding: 52px 28px 88px;
}

.eyebrow, .section-label { color: var(--orange); font-size: 14px; font-weight: 700; margin: 0 0 16px; }
h1 { font-size: clamp(42px, 7vw, 72px); line-height: 1.08; margin: 0; max-width: 760px; }
.lede { color: var(--muted); font-size: 20px; margin: 28px 0 0; max-width: 680px; }
.app-icon { border-radius: 48px; box-shadow: 0 28px 70px rgb(0 0 0 / 42%); height: 240px; width: 240px; }

.section { border-top: 1px solid var(--line); margin: 0 auto; max-width: 1064px; padding: 88px 28px 96px; }
h2 { font-size: clamp(30px, 5vw, 48px); line-height: 1.2; margin: 0 0 40px; max-width: 760px; }
.support-list { list-style: none; margin: 0; padding: 0; }
.support-list li { align-items: start; border-top: 1px solid var(--line); display: grid; gap: 24px; grid-template-columns: 44px minmax(0, 1fr); padding: 24px 0; }
.support-list li:last-child { border-bottom: 1px solid var(--line); }
.support-list span { color: var(--cyan); font-family: ui-monospace, "SFMono-Regular", monospace; font-size: 14px; padding-top: 3px; }
.support-list p { font-size: 18px; margin: 0; }
.support-note { color: var(--muted); margin: 32px 0 0 68px; max-width: 760px; }
.policy-date { color: var(--muted); margin: -24px 0 40px; }

.privacy-grid { background: var(--line); border: 1px solid var(--line); display: grid; gap: 1px; grid-template-columns: repeat(3, 1fr); }
.privacy-grid article { background: var(--panel); padding: 28px; }
h3 { font-size: 18px; margin: 0 0 12px; }
.privacy-grid p, .policy-detail p { color: var(--muted); margin: 0; }
.policy-detail { max-width: 800px; padding-top: 48px; }
.policy-block + .policy-block { margin-top: 32px; }
.policy-links { border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 40px; padding-top: 24px; }
.policy-links a { color: var(--cyan); text-decoration: underline; text-underline-offset: 4px; }

footer { border-top: 1px solid var(--line); color: var(--muted); display: flex; font-size: 14px; justify-content: space-between; margin: 0 auto; max-width: 1064px; padding: 32px 28px 48px; }

@media (max-width: 720px) {
  .site-header { height: 68px; padding: 0 20px; }
  nav { gap: 18px; }
  .language-bar { justify-content: space-between; padding: 16px 20px 0; }
  .language-switcher button { padding-inline: 9px; }
  .intro { gap: 36px; grid-template-columns: 1fr; min-height: auto; padding: 56px 20px 72px; }
  .app-icon { border-radius: 28px; height: 140px; order: -1; width: 140px; }
  .section { padding: 64px 20px 72px; }
  .privacy-grid { grid-template-columns: 1fr; }
  .support-note { margin-left: 0; }
  footer { gap: 12px; padding: 28px 20px 40px; }
}