:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --fg: #0f172a;
  --muted: #64748b;
  --card: #ffffff;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --badge-live-bg: #ecfdf5;
  --badge-live-fg: #047857;
  --badge-soon-bg: #f1f5f9;
  --badge-soon-fg: #475569;
  --badge-dl-bg: #fff7ed;
  --badge-dl-fg: #c2410c;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.04);
  --radius: 14px;
  --max: 960px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --card: #111827;
    --border: #1f2937;
    --accent: #60a5fa;
    --accent-soft: #0b1a33;
    --badge-live-bg: #052e1c;
    --badge-live-fg: #6ee7b7;
    --badge-soon-bg: #1e293b;
    --badge-soon-fg: #cbd5e1;
    --badge-dl-bg: #3b1d0b;
    --badge-dl-fg: #fdba74;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 28px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}
.brand { display: flex; align-items: baseline; gap: 0.45rem; color: inherit; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand-zh { font-weight: 700; font-size: 1.15rem; letter-spacing: 0.02em; }
.brand-en { color: var(--muted); font-size: 0.8rem; }
.nav { display: flex; align-items: center; gap: 0.85rem; flex-wrap: wrap; }
.nav a { color: var(--muted); font-size: 0.92rem; text-decoration: none; }
.nav a:hover { color: var(--fg); }
.nav-cta {
  color: var(--accent) !important;
  background: var(--accent-soft);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-weight: 600;
}

.hero { padding: 2.75rem 0 1.25rem; }
.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.7rem, 4vw, 2.15rem);
  letter-spacing: 0.01em;
  line-height: 1.25;
}
.hero-sub { margin: 0; color: var(--muted); max-width: 36rem; font-size: 1.02rem; }

.section { padding: 1.5rem 0 2rem; }
.section-head { margin-bottom: 1.1rem; }
.section-head h2, .about h2, .contact h2 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}
.section-head p, .about p, .contact p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1rem 0.95rem;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  min-height: 168px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover {
  text-decoration: none;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  transform: translateY(-1px);
}
.card-soon {
  opacity: 0.92;
  cursor: default;
}
.card-soon:hover { transform: none; border-color: var(--border); }
.card-featured { border-color: color-mix(in srgb, var(--badge-dl-fg) 35%, var(--border)); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.card-icon {
  width: 2rem; height: 2rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px;
  background: var(--accent-soft);
  font-size: 0.95rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.card h3 { margin: 0.15rem 0 0; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.88rem; flex: 1; }
.card-note { margin-top: 0.35rem; font-size: 0.75rem; color: var(--muted); }

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
}
.badge.live { background: var(--badge-live-bg); color: var(--badge-live-fg); }
.badge.soon { background: var(--badge-soon-bg); color: var(--badge-soon-fg); }
.badge.download { background: var(--badge-dl-bg); color: var(--badge-dl-fg); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  padding: 1.25rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contact {
  padding-top: 0.25rem;
  padding-bottom: 2.5rem;
}
.mail {
  display: inline-block;
  margin-top: 0.35rem;
  font-weight: 600;
  font-size: 1.05rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
}
.footer-inner { color: var(--muted); font-size: 0.88rem; }
.footer-inner p { margin: 0 0 0.35rem; }
.footer-inner .muted { opacity: 0.9; }
.copy { margin-top: 0.6rem !important; color: var(--fg); font-weight: 500; }

@media (max-width: 560px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 1.75rem; }
  .card { min-height: 0; }
}