:root {
  --bg: #08110e;
  --bg-soft: #10201b;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-strong: rgba(255, 255, 255, 0.1);
  --text: #f3f5f2;
  --muted: rgba(243, 245, 242, 0.72);
  --accent: #ef8f31;
  --accent-deep: #b55b1f;
  --line: rgba(255, 255, 255, 0.08);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(239, 143, 49, 0.18), transparent 28%),
    radial-gradient(circle at 12% 15%, rgba(108, 155, 120, 0.14), transparent 24%),
    linear-gradient(180deg, #0a1411 0%, #08110e 48%, #07100d 100%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(8, 17, 14, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.topbar-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-copy strong {
  font-size: 16px;
  letter-spacing: 0.08em;
}

.brand-copy span {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  font-weight: 700;
  transition: 180ms ease;
}

.lang-toggle {
  min-height: 46px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: 180ms ease;
}

.lang-toggle:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.06);
}

.button-primary {
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #201005;
}

.nav a:hover,
.button:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.06);
}

.button-primary:hover {
  background: linear-gradient(135deg, #ffa654, #cf6a23);
}

.hero {
  padding: 72px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: stretch;
}

.panel {
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.03));
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 34px;
}

.eyebrow {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(239, 143, 49, 0.12);
  color: #ffbb78;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero h1,
.page-hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero p,
.page-hero p,
.muted {
  color: var(--muted);
  line-height: 1.7;
  font-size: 16px;
}

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

.hero-card {
  padding: 22px;
  background:
    radial-gradient(circle at top right, rgba(239, 143, 49, 0.26), transparent 25%),
    linear-gradient(180deg, rgba(18, 32, 27, 0.96), rgba(8, 17, 14, 0.96));
}

.phone-frame {
  border-radius: 30px;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.16);
}

.phone-frame img {
  border-radius: 22px;
  width: 100%;
  aspect-ratio: 390 / 844;
  object-fit: cover;
}

.section {
  padding: 24px 0 56px;
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 18px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.03em;
}

.grid-3,
.grid-2 {
  display: grid;
  gap: 18px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card {
  padding: 24px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.download-layout,
.support-layout,
.privacy-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 22px;
  align-items: start;
  padding: 44px 0 60px;
}

.page-hero {
  padding: 20px 0 12px;
}

.device-chip-row,
.contact-list,
.support-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.chip {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  font-weight: 700;
  font-size: 14px;
}

.download-panel,
.support-panel,
.privacy-panel {
  padding: 24px;
}

.download-actions {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.download-note {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
}

.qr-card {
  padding: 18px;
}

.qr-card img {
  width: 100%;
  border-radius: 20px;
}

.policy-stack {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.policy-card h2 {
  margin: 0 0 12px;
  font-size: 26px;
  letter-spacing: -0.03em;
}

.policy-card p,
.policy-card li {
  color: var(--muted);
  line-height: 1.75;
  font-size: 16px;
}

.policy-card ul {
  margin: 0;
  padding-left: 22px;
}

.policy-card li + li {
  margin-top: 10px;
}

.policy-summary {
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
}

.policy-summary strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
}

.policy-summary p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.footer {
  padding: 18px 0 42px;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

@media (max-width: 960px) {
  .hero-grid,
  .download-layout,
  .support-layout,
  .privacy-layout,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .topbar-inner {
    padding: 12px 0;
    align-items: flex-start;
  }

  .brand {
    width: 100%;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 40px;
  }

  .hero-copy,
  .hero-card,
  .card,
  .download-panel,
  .support-panel,
  .privacy-panel {
    padding: 20px;
  }

  .shell {
    width: min(var(--max), calc(100% - 20px));
  }

  .topbar-inner {
    min-height: auto;
  }
}