:root {
  --bg: #000000;
  --card: #18181f;
  --card-hover: #202029;
  --text: #ffffff;
  --muted: #8e8e93;
  --border: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.15);
  --primary: #0ea5e9;
  --primary-hover: #38bdf8;
  --primary-glow: rgba(14, 165, 233, 0.25);
  --orange: #fb923c;
  --orange-glow: rgba(251, 146, 60, 0.2);

  /* 全局流体与响应式字阶体系 (Fluid Typography) */
  --font-hero: clamp(30px, 4.4vw, 48px);
  --font-hero-desc: clamp(14px, 1.8vw, 16px);
  --font-section-title: clamp(22px, 3.2vw, 30px);
  --font-section-sub: clamp(13px, 1.5vw, 14.5px);
  --font-card-title: 16px;
  --font-card-body: 13.5px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg, #000000);
  color: var(--text, #ffffff);
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部轻量生态赞助公告条 */
.top-announcement-bar {
  background: linear-gradient(90deg, #101017 0%, #161824 50%, #101017 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
  color: #fff;
  position: relative;
  z-index: 60;
  transition: all 0.25s ease;
}
.announcement-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 38px;
  padding-top: 6px;
  padding-bottom: 6px;
  gap: 12px;
}
.announcement-content {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  flex: 1;
}
.announcement-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(251, 146, 60, 0.15);
  color: var(--orange, #fb923c);
  border: 1px solid rgba(251, 146, 60, 0.3);
  padding: 1px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.announcement-text {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
}
.announcement-link {
  color: var(--primary, #0ea5e9);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
  transition: opacity 0.2s;
}
.announcement-link:hover {
  text-decoration: underline;
  opacity: 0.85;
}
.announcement-close {
  background: transparent;
  border: none;
  color: #8e8e93;
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  border-radius: 4px;
  transition: color 0.2s;
}
.announcement-close:hover {
  color: #fff;
}

/* 导航栏 */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(0, 0, 0, 0.82);
  border-bottom: 1px solid var(--border, rgba(255, 255, 255, 0.08));
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.brand-logo-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: 9px;
  background: #000000;
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 2px;
  box-shadow: 0 0 16px rgba(14, 165, 233, 0.3);
  transition: transform .2s ease, box-shadow .2s ease;
}
.brand-logo-img:hover {
  transform: scale(1.05);
  box-shadow: 0 0 24px rgba(14, 165, 233, 0.55);
}
.brand-name {
  font-size: 17.5px;
  font-weight: 650;
  letter-spacing: -0.2px;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-links {
  display: flex;
  gap: 20px;
}
.nav-links a {
  color: var(--muted, #8e8e93);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  transition: color .2s;
}
.nav-links a:hover {
  color: var(--text, #ffffff);
}
select.lang-picker {
  background: var(--card, #18181f);
  color: var(--text, #ffffff);
  border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
  border-radius: 9px;
  padding: 5px 10px;
  font-size: 12.5px;
  cursor: pointer;
  outline: none;
}

/* Hero 区域 */
.hero {
  padding: 64px 0 52px;
  text-align: center;
}
.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(14, 165, 233, 0.25);
  color: var(--primary, #0ea5e9);
  padding: 5px 14px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2px;
  margin-bottom: 22px;
}
h1.hero-title {
  font-size: var(--font-hero);
  font-weight: 700;
  letter-spacing: -0.6px;
  line-height: 1.18;
  margin: 0 auto 16px;
  max-width: 780px;
  background: linear-gradient(180deg, #ffffff 40%, rgba(255, 255, 255, 0.75) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
p.hero-desc {
  font-size: var(--font-hero-desc);
  line-height: 1.65;
  color: var(--muted, #8e8e93);
  max-width: 620px;
  margin: 0 auto 32px;
}

/* 下载按钮组 */
.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--card, #18181f);
  border: 1px solid var(--border, rgba(255, 255, 255, 0.15));
  color: #fff;
  text-decoration: none;
  padding: 11px 22px;
  border-radius: 14px;
  transition: all .2s ease;
  min-width: 185px;
  text-align: left;
}
.store-btn:hover {
  background: var(--card-hover, #202029);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.store-icon svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}
.store-text-sub {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.75;
}
.store-text-main {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
}

/* 手机机模 Mockup */
.mockup-wrap {
  max-width: 320px;
  margin: 0 auto 72px;
  position: relative;
}
.phone-mockup {
  background: #09090b;
  border: 4px solid #27272a;
  border-radius: 44px;
  padding: 12px;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.9), 0 0 30px rgba(14, 165, 233, 0.15);
}
.phone-screen {
  background: var(--card, #18181f);
  border-radius: 32px;
  padding: 22px 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  min-height: 480px;
  display: flex;
  flex-direction: column;
  text-align: left;
}
.mockup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.mockup-title {
  font-size: 14.5px;
  font-weight: 600;
}
.mockup-badge {
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 9999px;
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
  font-weight: 600;
}
.mockup-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 15px;
  padding: 12px 14px;
  margin-bottom: 10px;
}
.mockup-card-label {
  font-size: 11.5px;
  color: var(--muted, #8e8e93);
  margin-bottom: 3px;
}
.mockup-card-val {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.mockup-pill-row {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}
.mockup-pill {
  font-size: 10.5px;
  padding: 3px 9px;
  border-radius: 9999px;
  background: #262633;
  color: #94a3b8;
  font-weight: 500;
}
.mockup-pill.active {
  background: #0ea5e9;
  color: #000;
  font-weight: 700;
}

/* 手机机模内部赞助生态微卡片 */
.mockup-sponsor-card {
  background: linear-gradient(135deg, rgba(251, 146, 60, 0.09) 0%, rgba(24, 24, 31, 0.95) 100%);
  border: 1px solid rgba(251, 146, 60, 0.25);
  margin-bottom: 0;
}
.mockup-sponsor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.mockup-ad-chip {
  font-size: 9px;
  font-weight: 700;
  color: #fb923c;
  background: rgba(251, 146, 60, 0.18);
  border: 1px solid rgba(251, 146, 60, 0.35);
  padding: 1px 5px;
  border-radius: 4px;
}
.mockup-sponsor-body {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mockup-sponsor-title {
  font-size: 12.5px;
  font-weight: 600;
  color: #fff;
}
.mockup-sponsor-cta {
  font-size: 11px;
  font-weight: 600;
  color: #0ea5e9;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(14, 165, 233, 0.25);
  padding: 2px 7px;
  border-radius: 9999px;
  white-space: nowrap;
}

/* 核心功能与生态网格 */
.features-section {
  padding: 36px 0 72px;
}
.section-header {
  text-align: center;
  margin-bottom: 44px;
}
.section-title {
  font-size: var(--font-section-title);
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.3px;
}
.section-subtitle {
  font-size: var(--font-section-sub);
  color: var(--muted, #8e8e93);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.feature-card {
  background: var(--card, #18181f);
  border: 1px solid var(--border, rgba(255, 255, 255, 0.09));
  border-radius: 18px;
  padding: 24px 20px;
  transition: all .2s ease;
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  border-color: rgba(14, 165, 233, 0.35);
  transform: translateY(-3px);
}
.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(14, 165, 233, 0.12);
  color: var(--primary, #0ea5e9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: var(--font-card-title);
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.1px;
}
.feature-card p {
  font-size: var(--font-card-body);
  color: var(--muted, #8e8e93);
  line-height: 1.55;
  margin: 0;
  flex: 1;
}

/* 原生生态赞助卡片 */
.sponsor-card {
  position: relative;
  background: linear-gradient(145deg, #18181f 0%, #1e1b26 100%);
  border: 1px solid rgba(251, 146, 60, 0.24);
}
.sponsor-card:hover {
  border-color: rgba(251, 146, 60, 0.45);
  box-shadow: 0 8px 24px rgba(251, 146, 60, 0.12);
}
.sponsor-tag {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 10.5px;
  font-weight: 600;
  color: #fb923c;
  background: rgba(251, 146, 60, 0.12);
  border: 1px solid rgba(251, 146, 60, 0.28);
  padding: 2px 7px;
  border-radius: 9999px;
  letter-spacing: 0.3px;
}
.sponsor-icon {
  background: rgba(251, 146, 60, 0.14) !important;
  color: #fb923c !important;
}
.sponsor-action-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 500;
  color: #38bdf8;
  text-decoration: none;
  transition: color 0.2s ease;
}
.sponsor-action-link:hover {
  color: #0ea5e9;
  text-decoration: underline;
}

/* 隐私安全保障 Banner */
.security-banner {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(24, 24, 31, 0.92) 100%);
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: 22px;
  padding: 32px 36px;
  margin-bottom: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.security-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.2px;
}
.security-content p {
  font-size: 13.5px;
  color: var(--muted, #8e8e93);
  margin: 0;
  max-width: 620px;
  line-height: 1.6;
}
.sec-pro-highlight {
  display: inline-block;
  color: #38bdf8;
  font-weight: 500;
  margin-left: 4px;
}

/* 底部 Footer */
footer.site-footer {
  border-top: 1px solid var(--border, rgba(255, 255, 255, 0.08));
  padding: 44px 0 36px;
  color: var(--muted, #8e8e93);
  font-size: 13px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-brand p {
  margin: 8px 0 0;
  max-width: 300px;
  line-height: 1.6;
}
.footer-nav {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.footer-col h4 {
  color: var(--text, #ffffff);
  font-size: 13.5px;
  font-weight: 600;
  margin: 0 0 12px;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-col a {
  color: inherit;
  text-decoration: none;
  transition: color .2s;
}
.footer-col a:hover {
  color: var(--primary, #0ea5e9);
}
.footer-bottom {
  border-top: 1px solid var(--border, rgba(255, 255, 255, 0.05));
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
}

/* 响应式断点体系 */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
  .header-inner {
    height: 58px;
  }
  .hero {
    padding: 44px 0 36px;
  }
  .nav-links {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .feature-card {
    padding: 20px 18px;
  }
  .security-banner {
    padding: 24px 20px;
  }
  .download-buttons {
    gap: 12px;
    margin-bottom: 36px;
  }
  .store-btn {
    min-width: 155px;
    padding: 10px 16px;
  }
}

@media (max-width: 480px) {
  .announcement-inner {
    flex-direction: column;
    text-align: center;
    gap: 4px;
    padding-right: 28px;
  }
  .announcement-close {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
  }
  .download-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .store-btn {
    width: 100%;
    justify-content: center;
  }
}