:root {
  --bg: #f8f9fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #6b7280;
  --accent: #1c64f2;
  --accent-soft: rgba(28, 100, 242, 0.08);
}

* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.7;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(248, 249, 251, 0.92);
  border-bottom: 1px solid rgba(15, 23, 42, 0.05);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
}

.nav { display: flex; gap: 1rem; align-items: center; }
.nav__link { color: var(--muted); font-weight: 500; padding: 0.25rem 0.4rem; border-radius: 6px; }
.nav__link:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
.nav__link--active { color: var(--text); background: var(--accent-soft); }

.hero {
  padding: 3.5rem 0 2.5rem;
  display: grid;
  gap: 1.5rem;
}

.hero h1 { margin: 0; font-size: clamp(1.8rem, 2vw, 2.4rem); line-height: 1.25; }
.hero p { margin: 0.5rem 0 0; color: var(--muted); max-width: 640px; }

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid rgba(15, 23, 42, 0.05);
  border-radius: 16px;
  padding: 1.4rem;
  box-shadow: 0 10px 50px rgba(15, 23, 42, 0.08);
}

.card h2, .card h3 { margin-top: 0; margin-bottom: 0.4rem; font-size: 1.15rem; }
.card p { margin: 0.4rem 0 0; color: var(--muted); }

.section-title { margin: 2.5rem 0 1rem; font-size: 1.1rem; letter-spacing: 0.02em; color: var(--muted); }

.list {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.list__item {
  background: var(--card);
  border: 1px solid rgba(15, 23, 42, 0.05);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.list__item:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06); }
.list__title { margin: 0; font-weight: 600; }
.list__meta { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.95rem; }
.list__summary { margin: 0.4rem 0 0; color: var(--text); font-size: 0.98rem; }

.page { padding: 2.5rem 0; }
.page__header { margin-bottom: 1.5rem; }
.page__title { margin: 0; font-size: 1.8rem; }
.lead { color: var(--muted); margin-top: 0.6rem; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-size: 0.78rem; margin: 0 0 0.4rem; }

.post { padding: 2.5rem 0; }
.post__title { margin: 0; font-size: 2rem; }
.post__content { margin-top: 1.5rem; }
.post__content p { margin: 0 0 1rem; }
.post__content h2 { margin: 2rem 0 0.6rem; }

.callout {
  background: linear-gradient(135deg, var(--accent-soft), rgba(28, 100, 242, 0.02));
  border: 1px solid rgba(28, 100, 242, 0.15);
  border-radius: 14px;
  padding: 1.2rem;
  margin-top: 1rem;
}

.muted { color: var(--muted); }

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid rgba(15, 23, 42, 0.05);
  margin-top: 2rem;
}
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: 1.5rem; flex-wrap: wrap; }
.footer-meta { max-width: 400px; }

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
  .nav { flex-wrap: wrap; }
  .post__title { font-size: 1.5rem; }
}