/* PV-Atlas · 全站 base 样式
 * 设计基调：浅灰背景 + 深蓝品牌色 + 等宽数字 + 清爽留白
 */

:root {
  --c-bg: #f6f7f9;
  --c-card: #ffffff;
  --c-text: #1e293b;
  --c-text-soft: #475569;
  --c-text-mute: #94a3b8;
  --c-brand: #1e40af;
  --c-brand-soft: #dbeafe;
  --c-accent: #f59e0b;
  --c-border: #e2e8f0;
  --c-success: #059669;
  --c-radius: 10px;
  --c-shadow: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --font-sys: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sys);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Top navigation ───────────────────────────────────── */
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  padding: 12px 24px;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.05rem;
  color: var(--c-text); text-decoration: none;
}
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--c-brand); color: white;
  font-weight: 700; font-size: .85rem; letter-spacing: .5px;
}
.nav-main {
  display: flex; gap: 4px; margin-left: auto;
}
.nav-main a {
  padding: 6px 12px; border-radius: 6px;
  color: var(--c-text-soft); font-weight: 500; font-size: .94rem;
  text-decoration: none;
}
.nav-main a:hover {
  background: var(--c-bg); color: var(--c-text);
}
.nav-extra .rater-link {
  font-size: .82rem; color: var(--c-text-mute);
}
.nav-extra .rater-link:hover { color: var(--c-text-soft); }

/* ── Hero ─────────────────────────────────────────────── */
.hero {
  padding: 72px 24px 56px;
  background: linear-gradient(180deg, var(--c-brand-soft) 0%, var(--c-bg) 100%);
}
.hero-inner {
  max-width: 920px; margin: 0 auto; text-align: center;
}
.hero h1 {
  font-size: 2.4rem; font-weight: 700;
  margin: 0 0 16px; color: var(--c-text);
  letter-spacing: -.02em;
}
.hero-sub {
  font-size: 1.1rem; color: var(--c-text-soft);
  max-width: 640px; margin: 0 auto 28px;
}
.hero-cta {
  display: flex; gap: 12px; justify-content: center; margin-bottom: 36px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center;
  padding: 10px 22px; border-radius: 8px;
  font-weight: 600; font-size: .95rem; cursor: pointer;
  text-decoration: none; border: 1px solid transparent;
  transition: all .15s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--c-brand); color: white;
}
.btn-primary:hover { background: #1e3a8a; }
.btn-ghost {
  background: white; color: var(--c-brand);
  border-color: var(--c-border);
}
.btn-ghost:hover { background: var(--c-brand-soft); }

.hero-stats {
  display: flex; gap: 36px; justify-content: center;
  flex-wrap: wrap; padding-top: 20px;
  border-top: 1px solid rgba(30,64,175,.15);
}
.hero-stats > span {
  font-family: var(--font-mono);
  font-size: 1.6rem; font-weight: 700;
  color: var(--c-brand);
  display: block;
}
.hero-stats > small {
  font-size: .82rem; color: var(--c-text-mute);
  display: block; margin-right: 12px;
}

/* ── Section title ────────────────────────────────────── */
.section-title {
  font-size: 1.5rem; margin: 0 0 24px;
  font-weight: 700; color: var(--c-text);
}
.modules, .participation {
  padding: 56px 0;
}

/* ── Module cards ─────────────────────────────────────── */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.module-card {
  background: var(--c-card);
  border-radius: var(--c-radius);
  padding: 28px 24px;
  border: 1px solid var(--c-border);
  box-shadow: var(--c-shadow);
  text-decoration: none; color: var(--c-text);
  display: flex; flex-direction: column;
  transition: transform .15s ease, box-shadow .15s ease;
}
.module-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(15,23,42,.08);
  text-decoration: none;
}
.module-icon { font-size: 2rem; margin-bottom: 8px; }
.module-card h3 { margin: 0 0 8px; font-size: 1.2rem; }
.module-card p {
  margin: 0 0 16px;
  color: var(--c-text-soft); font-size: .94rem; flex: 1;
}
.module-link {
  color: var(--c-brand); font-weight: 600; font-size: .9rem;
}

/* ── Participation cards ─────────────────────────────── */
.part-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.part-card {
  background: var(--c-card);
  border-radius: var(--c-radius);
  padding: 28px 24px;
  border: 1px solid var(--c-border);
}
.part-card.public { border-left: 4px solid var(--c-success); }
.part-card.expert { border-left: 4px solid var(--c-accent); }
.part-card h3 { margin: 0 0 16px; font-size: 1.15rem; }
.part-card ul {
  list-style: none; padding: 0; margin: 0 0 20px;
}
.part-card li {
  padding: 8px 0;
  color: var(--c-text-soft); font-size: .94rem;
  border-bottom: 1px dashed var(--c-border);
}
.part-card li:last-child { border-bottom: none; }

/* ── Footer ───────────────────────────────────────────── */
.footer {
  background: white;
  border-top: 1px solid var(--c-border);
  padding: 28px 0;
  margin-top: 56px;
}
.footer-inner {
  display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: 12px;
  color: var(--c-text-mute); font-size: .88rem;
}
.footer-meta {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.footer-meta .icp {
  display: inline-flex; gap: 6px; align-items: center;
  color: var(--c-text-mute); font-size: .82rem;
}
.footer-meta .icp a {
  color: var(--c-text-mute);
  text-decoration: none;
}
.footer-meta .icp a:hover { color: var(--c-text-soft); }
.footer-meta .icp-sep { color: var(--c-text-mute); }
.footer-nav { display: flex; gap: 18px; }
.footer-nav a { color: var(--c-text-soft); font-size: .88rem; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 720px) {
  .hero { padding: 48px 16px 40px; }
  .hero h1 { font-size: 1.7rem; }
  .nav-main { display: none; }
  .modules, .participation { padding: 40px 0; }
}