:root {
  --accent: #C8161D;
  --accent-dark: #9E1016;
  --ink: #1A1A1A;
  --muted: #5A5A5A;
  --line: #E6E8EC;
  --bg: #F6F7F9;
  --paper: #FFFFFF;
  --wrap: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }
.wrap { width: min(var(--wrap), calc(100% - 40px)); margin: 0 auto; }

.header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
}
.brand svg { width: 32px; height: 32px; }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav a {
  text-decoration: none;
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 8px;
}
.nav a[aria-current="page"] {
  background: #FDECEC;
  color: var(--accent);
  font-weight: 700;
}

.hero {
  background: linear-gradient(180deg, #FFFFFF 0%, #F6F7F9 100%);
  padding: 48px 0 36px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}
.hero h1 { margin: 0 0 16px; font-size: 32px; line-height: 1.35; }
.hero p { margin: 0 0 16px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.hero-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  text-decoration: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}
.btn:hover { background: var(--accent-dark); }
.btn-alt {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.section { padding: 48px 0; }
.section-alt { background: #fff; }
.section h2 { margin: 0 0 16px; font-size: 24px; }
.section p { margin: 0 0 14px; }
.lead { color: var(--muted); }

.grid-2, .grid-3, .grid-4, .platform, .reviews {
  display: grid;
  gap: 16px;
}
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3, .reviews { grid-template-columns: repeat(3, 1fr); }
.grid-4, .platform { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.icon { width: 36px; height: 36px; color: var(--accent); margin-bottom: 10px; }

.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; background: #fff; }
.table th, .table td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.table th { background: #FDECEC; }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-item { padding: 16px 0; border-bottom: 1px solid var(--line); }
.news-item h3 { margin: 0 0 6px; font-size: 18px; }
.news-date { color: var(--muted); font-size: 14px; margin: 0 0 6px; }

.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin-bottom: 10px; }

.footer {
  background: #1A1A1A;
  color: #D8D8D8;
  padding: 28px 0;
  font-size: 14px;
}
.footer p { margin: 0 0 8px; }

@media (max-width: 900px) {
  .hero-grid, .grid-2, .grid-3, .reviews { grid-template-columns: 1fr; }
  .grid-4, .platform { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .header .wrap { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .grid-4, .platform { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
}