/* Base */
:root {
  --bg: #ffffff;
  --text: #222222;
  --muted: #6b7280;
  --primary: #c6202a;
  --primary-600: #a91a23;
  --border: #e5e7eb;
  --card: #f9fafb;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand .logo { width: 40px; height: 40px; object-fit: contain; border-radius: 6px; }
.brand-text .cn { font-weight: 700; }
.brand-text .en { color: var(--muted); font-size: 14px; }

.nav { display: flex; gap: 16px; }
.nav a { text-decoration: none; color: #111827; padding: 8px 10px; border-radius: 6px; }
.nav a:hover { background: var(--card); }
.nav a.active { color: var(--primary); font-weight: 600; }

/* Hero */
.hero { padding: 56px 0; background: linear-gradient(180deg, #ffffff, #f8f8f8); }
.hero h1 { font-size: 32px; margin: 0 0 12px; }
.lead { color: var(--muted); max-width: 760px; }
.cta-group { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 10px 16px; border-radius: 8px; border: 1px solid var(--border); color: #111827; text-decoration: none; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-600); border-color: var(--primary-600); }

/* Sections */
section { padding: 40px 0; }
.about .grid-2 { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 800px) { .about .grid-2 { grid-template-columns: 1fr 1fr; } }
.bullet { margin: 10px 0 0; padding-left: 18px; }
.bullet li { margin: 6px 0; }

/* Cards */
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(2, 1fr); } }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: inherit; display: block; }
.card-body { padding: 16px; }
.card h3 { margin: 0 0 8px; }
.card .more { color: var(--primary); font-weight: 600; }

/* Downloads */
.download-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.download { display: flex; flex-direction: column; gap: 2px; padding: 12px; border: 1px dashed var(--border); border-radius: 10px; text-decoration: none; color: inherit; }
.download:hover { background: #fff; border-color: var(--primary); }
.download small { color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: #fff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 0; flex-wrap: wrap; }
.footer-col h4 { margin: 0 0 8px; }
.footer-col p { margin: 6px 0; color: var(--muted); }
.logo.small { width: 32px; height: 32px; }
.copy { color: var(--muted); font-size: 14px; }

/* Page hero */
.page-hero { padding: 36px 0 12px; border-bottom: 1px solid var(--border); background: #fafafa; }