:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1e2a36;
  --muted: #5f6f82;
  --line: #dfe6ee;
  --brand: #1f2f46;
  --brand-soft: #ecf2f8;
  --accent: #d99148;
  --accent-soft: #fff4e7;
  --success: #407f61;
  --shadow: 0 18px 44px rgba(31, 47, 70, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner,
.search-row,
.container,
.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0 10px;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: var(--brand);
}

.logo-link img { width: 118px; height: auto; }
.logo-text span { display: block; font-size: 12px; color: var(--muted); font-weight: 600; }

.primary-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.primary-nav a {
  padding: 8px 10px;
  color: var(--brand);
  font-weight: 700;
  border-radius: 12px;
}

.primary-nav a:hover,
.primary-nav a:focus {
  background: var(--brand-soft);
}

.search-row {
  padding: 0 0 14px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--brand-soft);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 9px;
}

.search-box input {
  flex: 1;
  border: 0;
  background: transparent;
  outline: none;
  font-size: 15px;
  color: var(--text);
  min-width: 0;
}

.search-box button,
.btn {
  border: 0;
  border-radius: 999px;
  padding: 11px 18px;
  cursor: pointer;
  font-weight: 800;
  color: #fff;
  background: var(--brand);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn.alt {
  background: var(--accent);
}

.btn.ghost {
  color: var(--brand);
  background: #fff;
  border: 1px solid var(--line);
}

.search-tip {
  display: none;
  color: var(--muted);
  font-size: 13px;
  padding: 8px 4px 0;
}

.hero {
  padding: 66px 0 40px;
  background:
    radial-gradient(circle at top left, #fff8ef 0, transparent 34%),
    linear-gradient(135deg, #f9fbfd 0%, #edf3f8 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 34px;
  align-items: center;
}

.eyebrow {
  color: var(--success);
  background: #eaf6ef;
  border: 1px solid #cfe8da;
  display: inline-flex;
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 800;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--brand);
  line-height: 1.25;
  margin: 0 0 14px;
}

h1 { font-size: clamp(34px, 5vw, 56px); letter-spacing: -.02em; }
h2 { font-size: clamp(26px, 3vw, 38px); }
h3 { font-size: 21px; }
p { margin: 0 0 14px; color: var(--muted); }

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 22px 0;
}

.hero-points,
.metric-list,
.clean-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
}

.hero-points li,
.clean-list li {
  margin: 9px 0;
  padding-left: 28px;
  position: relative;
  color: var(--text);
}

.hero-points li::before,
.clean-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--success);
  font-weight: 900;
}

.hero-card,
.card,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow);
}

.hero-card { padding: 16px; }
.hero-card figure { margin: 0; position: relative; }
.hero-card figcaption { font-size: 14px; color: var(--muted); padding: 12px 8px 2px; }
.hero-card img { border-radius: 20px; width: 100%; }

.metric-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 16px;
}

.metric-list li {
  background: var(--brand-soft);
  border-radius: 18px;
  padding: 14px;
}

.metric-list strong {
  display: block;
  color: var(--brand);
  font-size: 24px;
}

.section {
  padding: 60px 0;
}

.section-header {
  max-width: 780px;
  margin-bottom: 28px;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }

.card {
  padding: 24px;
  transition: transform .2s ease, box-shadow .2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 56px rgba(31, 47, 70, .14);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  border-radius: 999px;
  background: var(--accent-soft);
  color: #895b23;
  font-size: 13px;
  padding: 4px 10px;
  font-weight: 700;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.video-card {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background: #101923;
  border: 1px solid var(--line);
  min-height: 330px;
  box-shadow: var(--shadow);
}

.video-card video,
.video-card img {
  width: 100%;
  height: 188px;
  object-fit: cover;
  opacity: .9;
}

.play-layer {
  position: absolute;
  inset: 0 0 auto 0;
  height: 188px;
  display: grid;
  place-items: center;
  background: rgba(18, 28, 40, .18);
  transition: background .2s ease;
}

.play-button {
  transform: scale(.86);
  opacity: 0;
  width: 62px;
  height: 62px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(31, 47, 70, .88);
  transition: transform .2s ease, opacity .2s ease;
  font-size: 24px;
}

.video-card:hover .play-layer { background: rgba(18, 28, 40, .42); }
.video-card:hover .play-button { opacity: 1; transform: scale(1); }

.video-info {
  padding: 18px;
  background: #fff;
}

.video-info p { font-size: 14px; }
.video-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.timeline {
  border-left: 3px solid var(--line);
  padding-left: 22px;
}

.timeline article {
  position: relative;
  margin-bottom: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px;
}

.timeline article::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  margin-bottom: 14px;
}

.quote {
  font-size: 15px;
  color: var(--text);
  border-left: 4px solid var(--accent);
  padding-left: 14px;
}

.breadcrumb {
  color: var(--muted);
  font-size: 14px;
  margin: 28px 0 8px;
}

.breadcrumb a {
  color: var(--brand);
  font-weight: 700;
}

.page-hero {
  padding: 36px 0 26px;
  background: linear-gradient(135deg, #f9fbfd 0%, #edf3f8 100%);
  border-bottom: 1px solid var(--line);
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
}

.article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 30px;
  box-shadow: var(--shadow);
}

.article figure { margin: 0 0 24px; }
.article img { border-radius: 22px; }
.article figcaption { color: var(--muted); font-size: 14px; margin-top: 10px; }

.article h2, .article h3 {
  margin-top: 26px;
}

.aside-box {
  position: sticky;
  top: 135px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
}

.contact-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.site-footer {
  background: #152235;
  color: #dfe6ee;
  margin-top: 50px;
  padding: 44px 0 24px;
}

.site-footer p,
.site-footer a,
.site-footer li {
  color: #dfe6ee;
}

.footer-inner {
  display: grid;
  gap: 24px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(255,255,255,.14);
  padding-bottom: 22px;
}

.footer-logo img {
  width: 118px;
  background: #fff;
  border-radius: 14px;
  padding: 4px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
  color: #c8d3df;
}

@media (max-width: 980px) {
  .hero-grid,
  .content-layout,
  .contact-box {
    grid-template-columns: 1fr;
  }
  .grid.three,
  .grid.four,
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .aside-box { position: static; }
}

@media (max-width: 640px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }
  .primary-nav { gap: 8px; }
  .grid.three,
  .grid.two,
  .grid.four,
  .video-grid,
  .metric-list {
    grid-template-columns: 1fr;
  }
  .section { padding: 42px 0; }
  .card, .article { padding: 20px; }
}