:root {
  --bg: #f3f6fb;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --brand: #ea580c;
  --brand-dark: #c2410c;
  --line: #dbe4f0;
  --shadow: 0 8px 30px rgba(2, 6, 23, 0.08);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: linear-gradient(180deg, #f8fafc 0%, var(--bg) 35%, var(--bg) 100%);
}

.container {
  width: min(100% - 2rem, 1024px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  background: #111827;
  color: #fff;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 10;
}

.hero {
  background: radial-gradient(circle at 0 0, #1e293b 0%, #0f172a 45%, #020617 100%);
  color: #fff;
  padding: 2.2rem 0 2.4rem;
}

.hero__content h1 {
  margin: 0.2rem 0 0.7rem;
  font-size: clamp(1.5rem, 2.3vw + 0.9rem, 2.5rem);
  line-height: 1.25;
}

.eyebrow {
  margin: 0;
  color: #fb923c;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0;
  color: #cbd5e1;
}

.quick-nav {
  margin-top: 1rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.quick-nav a {
  color: #fff;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.95rem;
}

.quick-nav a:hover,
.quick-nav a:focus-visible {
  border-color: #fb923c;
  color: #fb923c;
}

main {
  padding: 1.2rem 0 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 1.3vw, 1.5rem);
  margin-bottom: 1rem;
}

.card h2 {
  margin-top: 0;
  line-height: 1.35;
}

.download-card {
  display: grid;
  grid-template-columns: 1.3fr minmax(180px, 220px);
  gap: 1rem;
  align-items: center;
}

.download-actions {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-block;
  text-decoration: none;
  color: #fff;
  padding: 0.55rem 1rem;
  border-radius: 10px;
  font-weight: 700;
}

.btn-android {
  background: #16a34a;
}

.btn-android:hover,
.btn-android:focus-visible {
  background: #15803d;
}

.btn-ios {
  background: var(--brand);
}

.btn-ios:hover,
.btn-ios:focus-visible {
  background: var(--brand-dark);
}

.qr-block {
  margin: 0;
  text-align: center;
}

.qr-block img {
  width: min(100%, 200px);
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.qr-block figcaption {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

details {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.9rem;
  margin-bottom: 0.7rem;
  background: #f8fafc;
}

summary {
  cursor: pointer;
  font-weight: 700;
  color: #0b2f61;
}

details p {
  margin: 0.7rem 0 0;
  color: #1e293b;
}

code {
  font-family: Consolas, "Courier New", monospace;
  background: #eef2ff;
  border: 1px solid #dbeafe;
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
}

.note p {
  margin-bottom: 0;
}

.footer {
  color: #e2e8f0;
  background: #0f172a;
  padding: 0.9rem 0;
  text-align: center;
  font-size: 0.92rem;
}

@media (max-width: 760px) {
  .download-card {
    grid-template-columns: 1fr;
  }

  .download-actions {
    gap: 0.5rem;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}