:root {
  --bg: #f8fafc;
  --paper: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #2563eb;
  --brand-2: #16a34a;
  --soft: #eff6ff;
  --radius: 24px;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  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, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo img, .footer-logo img { width: 160px; height: auto; }
.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
}
.main-nav a {
  padding: 8px 10px;
  border-radius: 999px;
  color: #334155;
}
.main-nav a:hover { background: var(--soft); color: var(--brand); }
.search-strip {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 22px 14px;
}
.fake-search {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  background: #f1f5f9;
  padding: 10px;
  border-radius: 18px;
}
.fake-search label { font-weight: 700; color: #1e293b; }
.fake-search input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 11px 16px;
  font-size: 15px;
}
.fake-search button, .btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
}
.fake-search button, .btn.primary { background: var(--brand); color: #fff; }
.btn.ghost { background: #e0f2fe; color: #075985; }
.search-message { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.section, .breadcrumb {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 22px;
}
.breadcrumb {
  padding-top: 26px;
  padding-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  gap: 10px;
}
.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  gap: 42px;
  align-items: center;
}
.eyebrow {
  color: var(--brand);
  font-weight: 800;
  letter-spacing: 0.08em;
  font-size: 14px;
  margin: 0 0 12px;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 5vw, 58px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 3vw, 38px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: #475569; }
.hero-copy > p:not(.eyebrow) { font-size: 18px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 28px 0 14px; }
.domain-note { font-size: 14px; color: var(--muted); }
.hero-media, .side-image, .video-figure {
  margin: 0;
}
.hero-media img, .side-image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}
.section-head {
  max-width: 780px;
  margin-bottom: 28px;
}
.compact { padding-top: 28px; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.video-card, .info-card, .review-card, .step-card, .timeline article, .prose-block, .contact-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.video-card { overflow: hidden; }
.video-preview {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #0f172a;
  overflow: hidden;
}
.video-preview img, .visual-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.visual-video { opacity: 0; }
.play-button {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 74px;
  height: 74px;
  border-radius: 50%;
  border: 0;
  background: rgba(37, 99, 235, 0.92);
  color: #fff;
  font-size: 26px;
  opacity: 0;
  transition: 0.2s ease;
  cursor: pointer;
}
.video-preview:hover .play-button,
.video-preview.is-hovered .play-button,
.video-preview.is-active .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-preview::after {
  content: "每日大赛视频演示";
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  color: #fff;
  background: rgba(15, 23, 42, 0.72);
  font-size: 13px;
}
.video-card-body { padding: 22px; }
.metrics, .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.metrics span, .tags span {
  padding: 6px 10px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #334155;
  font-size: 13px;
}
.tags span { background: #ecfdf5; color: #166534; }
.card-grid, .review-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.info-card, .review-card, .step-card, .timeline article, .prose-block { padding: 24px; }
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.85fr);
  gap: 30px;
  align-items: start;
}
.steps { display: grid; gap: 16px; }
.step-card span, .timeline article span {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--brand);
  font-weight: 800;
}
.timeline { display: grid; gap: 18px; }
.faq-list { display: grid; gap: 12px; }
details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px 20px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
}
summary { cursor: pointer; font-weight: 800; color: #1e293b; }
details p { margin-top: 10px; }
.review-card p { font-size: 16px; }
.review-card h3 { margin-top: 18px; margin-bottom: 2px; }
.review-card span { color: var(--muted); font-size: 14px; }
.contact-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 30px;
}
.page-hero {
  padding-bottom: 32px;
}
.prose-block pre {
  overflow-x: auto;
  background: #0f172a;
  color: #dbeafe;
  border-radius: 18px;
  padding: 18px;
  font-size: 13px;
}
.site-footer {
  margin-top: 60px;
  background: #0f172a;
  color: #e2e8f0;
}
.site-footer p, .site-footer a { color: #cbd5e1; }
.footer-grid {
  max-width: 1180px;
  margin: 0 auto;
  padding: 52px 22px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 34px;
}
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.ad-demo-slot {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 30;
  max-width: 280px;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.88);
  color: #fff;
  font-size: 12px;
  box-shadow: var(--shadow);
}
@media (max-width: 960px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  .main-nav { justify-content: flex-start; }
  .hero, .split { grid-template-columns: 1fr; min-height: auto; }
  .video-grid, .card-grid, .review-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-panel { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 640px) {
  .section, .breadcrumb { padding-left: 16px; padding-right: 16px; }
  .section { padding-top: 46px; padding-bottom: 46px; }
  .fake-search { grid-template-columns: 1fr; }
  .video-grid, .card-grid, .review-grid, .footer-grid { grid-template-columns: 1fr; }
  .main-nav a { font-size: 13px; padding: 7px 9px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; text-align: center; }
  .ad-demo-slot { left: 14px; right: 14px; max-width: none; }
}