:root {
  --xb-indigo: #1c2554;
  --xb-violet: #4a3f8c;
  --xb-mint: #2ec4b6;
  --xb-coral: #ff6f59;
  --xb-gold: #f4b942;
  --xb-snow: #f7f9fc;
  --xb-text: #1a2238;
  --xb-muted: #5c6478;
  --xb-glass: rgba(255, 255, 255, 0.72);
  --xb-radius: 18px;
  --xb-shadow: 0 18px 48px rgba(28, 37, 84, 0.12);
  --xb-font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--xb-font);
  color: var(--xb-text);
  background: linear-gradient(165deg, #eef3ff 0%, #fafbfd 42%, #fff5f0 100%);
  line-height: 1.78;
  min-height: 100vh;
}

body.xb-has-sticky { padding-top: 88px; }

body.xb-nav-lock { overflow: hidden; }

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

a { color: var(--xb-violet); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--xb-coral); }

.xb-site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--xb-glass);
  border-bottom: 1px solid rgba(74, 63, 140, 0.08);
}

body.xb-nav-lock .xb-site-header {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: #ffffff;
}

.xb-header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.xb-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--xb-indigo);
}

.xb-brand img { width: 42px; height: 42px; border-radius: 12px; }

.xb-nav-desktop { display: none; gap: 28px; }
.xb-nav-desktop a { color: var(--xb-text); font-weight: 500; font-size: 0.95rem; }
.xb-nav-desktop a[aria-current="page"] { color: var(--xb-mint); }

.xb-nav-trigger {
  width: 44px; height: 44px;
  border: none; border-radius: 12px;
  background: linear-gradient(135deg, var(--xb-mint), var(--xb-violet));
  cursor: pointer;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 5px;
}

.xb-nav-trigger span {
  display: block; width: 20px; height: 2px;
  background: #fff; border-radius: 2px;
}

.xb-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.32s ease, visibility 0.32s ease;
}

.xb-nav-overlay.xb-nav-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.xb-nav-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(82vw, 320px);
  background: #1c2554;
  background-color: #1c2554;
  transform: translateX(100%);
  transition: transform 0.32s ease;
  z-index: 9999;
  padding: 72px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 0;
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.35);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.xb-nav-panel.xb-nav-open { transform: translateX(0); }

.xb-nav-panel a,
.xb-nav-panel a:link,
.xb-nav-panel a:visited,
.xb-nav-panel a:hover,
.xb-nav-panel a:active {
  color: #ffffff !important;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 16px 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  display: block;
  -webkit-text-fill-color: #ffffff;
}

.xb-sticky-dl {
  position: fixed;
  top: -120px;
  left: 50%;
  z-index: 880;
  width: auto;
  max-width: calc(100vw - 24px);
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(46, 196, 182, 0.2);
  border-top: none;
  border-radius: 0 0 16px 16px;
  box-shadow: 0 8px 24px rgba(28, 37, 84, 0.12);
  transition: top 0.35s ease;
  padding: 8px 10px;
}

.xb-sticky-dl.xb-sticky-visible { top: 62px; }

.xb-sticky-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
}

.xb-sticky-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  text-decoration: none; color: var(--xb-muted); font-size: 0.68rem;
}

.xb-sticky-item img {
  width: 48px; height: 48px; border-radius: 14px;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(28,37,84,0.1);
}

.xb-promo-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 20px 0;
}

#xb-promo-zone {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.xb-promo-cell { width: 70px; text-align: center; }
.xb-promo-cell img {
  width: 65px; height: 65px; border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 6px 16px rgba(28,37,84,0.12);
}

.xb-promo-cap {
  font-size: 11px; color: var(--xb-muted);
  margin-top: 4px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap;
}

.xb-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 20px 56px;
  max-width: 1180px;
  margin: 0 auto;
}

.xb-hero::before {
  content: "";
  position: absolute;
  top: -60px; right: -80px;
  width: 340px; height: 340px;
  background: radial-gradient(circle, rgba(46,196,182,0.35), transparent 70%);
  pointer-events: none;
}

.xb-hero-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.xb-hero h1 {
  font-size: clamp(1.65rem, 5vw, 2.35rem);
  line-height: 1.35;
  color: var(--xb-indigo);
  margin-bottom: 16px;
}

.xb-hero-lead {
  font-size: 1.05rem;
  color: var(--xb-muted);
  margin-bottom: 24px;
}

.xb-hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--xb-mint), var(--xb-violet));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.xb-hero-visual {
  border-radius: var(--xb-radius);
  overflow: hidden;
  box-shadow: var(--xb-shadow);
  border: 3px solid rgba(255,255,255,0.8);
}

.xb-main { max-width: 1180px; margin: 0 auto; padding: 0 20px 64px; }

.xb-section { margin-bottom: 52px; }

.xb-section h2 {
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  color: var(--xb-indigo);
  margin-bottom: 18px;
  padding-left: 14px;
  border-left: 4px solid var(--xb-coral);
}

.xb-section h3 {
  font-size: 1.15rem;
  color: var(--xb-violet);
  margin: 22px 0 10px;
}

.xb-section p { margin-bottom: 14px; color: var(--xb-text); }

.xb-card-row {
  display: grid;
  gap: 20px;
  margin: 24px 0;
}

.xb-glass-card {
  background: var(--xb-glass);
  backdrop-filter: blur(10px);
  border-radius: var(--xb-radius);
  padding: 24px;
  border: 1px solid rgba(255,255,255,0.6);
  box-shadow: var(--xb-shadow);
  transition: transform 0.25s ease;
}

.xb-glass-card:hover { transform: translateY(-4px); }

.xb-glass-card h3 { margin-top: 0; }

.xb-media-block {
  display: grid;
  gap: 24px;
  align-items: center;
  margin: 28px 0;
}

.xb-media-block img {
  border-radius: var(--xb-radius);
  box-shadow: var(--xb-shadow);
}

.xb-media-reverse .xb-media-text { order: 2; }
.xb-media-reverse .xb-media-img { order: 1; }

.xb-feature-grid {
  display: grid;
  gap: 16px;
  margin: 20px 0;
}

.xb-feature-chip {
  background: linear-gradient(135deg, rgba(46,196,182,0.12), rgba(74,63,140,0.08));
  border-radius: 14px;
  padding: 18px 20px;
  border-left: 3px solid var(--xb-mint);
}

.xb-dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--xb-coral), #ff9472);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(255,111,89,0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}

.xb-dl-btn:hover { transform: scale(1.03); color: #fff !important; box-shadow: 0 12px 32px rgba(255,111,89,0.45); }

.xb-breadcrumb {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 20px 0;
  font-size: 0.88rem;
  color: var(--xb-muted);
}

.xb-breadcrumb a { color: var(--xb-violet); }

.xb-legal-body { max-width: 860px; }
.xb-legal-body h2 { margin-top: 32px; }
.xb-legal-body ul { margin: 12px 0 16px 24px; }
.xb-legal-body li { margin-bottom: 8px; }

.xb-error-page {
  text-align: center;
  padding: 60px 20px 80px;
  max-width: 640px;
  margin: 0 auto;
}

.xb-error-code {
  font-size: 5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--xb-mint), var(--xb-violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.xb-site-footer {
  background: var(--xb-indigo);
  color: rgba(255,255,255,0.85);
  padding: 40px 20px;
  margin-top: 40px;
}

.xb-footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  text-align: center;
}

.xb-footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
}

.xb-footer-nav a { color: rgba(255,255,255,0.9); font-size: 0.92rem; }
.xb-footer-copy { font-size: 0.82rem; opacity: 0.7; }

@media (min-width: 768px) {
  .xb-nav-desktop { display: flex; }
  .xb-nav-trigger { display: none; }
  .xb-hero-grid { grid-template-columns: 1.1fr 0.9fr; }
  .xb-card-row { grid-template-columns: repeat(3, 1fr); }
  .xb-media-block { grid-template-columns: 1fr 1fr; }
  .xb-feature-grid { grid-template-columns: repeat(2, 1fr); }
  .xb-sticky-grid { grid-template-columns: repeat(8, 1fr); width: 100%; }
  body.xb-has-sticky { padding-top: 96px; }
  .xb-sticky-dl {
    left: 0;
    right: 0;
    width: 100%;
    max-width: none;
    transform: none;
    border-radius: 0;
    padding: 10px 20px;
  }
  .xb-sticky-dl.xb-sticky-visible { top: 68px; }
}

@media (max-width: 767px) {
  .xb-media-reverse .xb-media-text,
  .xb-media-reverse .xb-media-img { order: unset; }

  .xb-sticky-dl {
    display: none !important;
  }

  body.xb-has-sticky {
    padding-top: 0 !important;
  }

  .xb-nav-panel {
    width: 78vw;
    max-width: 300px;
    padding-top: 64px;
  }

  .xb-nav-panel a,
  .xb-nav-panel a:link,
  .xb-nav-panel a:visited,
  .xb-nav-panel a:hover,
  .xb-nav-panel a:active {
    font-size: 1.05rem;
    padding: 18px 12px;
  }

  .xb-promo-wrap {
    padding: 12px 16px 0;
    max-width: calc(5 * 70px + 4 * 10px + 32px);
    margin-left: auto;
    margin-right: auto;
  }

  #xb-promo-zone {
    gap: 10px;
    justify-content: center;
  }

  .xb-promo-cell { width: 62px; }

  .xb-promo-cell img {
    width: 56px;
    height: 56px;
  }
}