:root {
  --bg: #f6faf4;
  --ink: #1a2e1f;
  --muted: #5c6b60;
  --accent: #2d6a4f;
  --accent-soft: #e8f5e9;
  --card: #fff;
  --line: #dce8df;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #e8f5e9, var(--bg));
  color: var(--ink);
  line-height: 1.5;
  min-height: 100vh;
}
.hub-shell { min-height: 100vh; display: flex; flex-direction: column; }
.hub-topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.hub-topbar-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.hub-brand { margin: 0; display: flex; flex-direction: column; gap: 0.1rem; }
.hub-brand-eyebrow { font-size: 0.7rem; letter-spacing: 0.16em; color: var(--muted); }
.hub-brand-title { font-size: 1.05rem; font-weight: 700; color: var(--accent); }
.hub-link { font-size: 0.9rem; color: var(--accent); text-decoration: none; white-space: nowrap; }
.hub-link:hover { text-decoration: underline; }
.page { max-width: 920px; margin: 0 auto; padding: 2rem 1.25rem 4rem; flex: 1; width: 100%; }
.eyebrow { letter-spacing: 0.2em; font-size: 0.75rem; color: var(--muted); text-transform: uppercase; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0.4rem 0; }
.lead { color: var(--muted); line-height: 1.6; max-width: 40rem; }
.cards { display: grid; gap: 1rem; margin-top: 2rem; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 719px) { .cards { grid-template-columns: 1fr; } }
.card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.5rem;
  min-height: 11rem;
  transition: transform 0.15s, box-shadow 0.15s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(45, 106, 79, 0.12); }
.card-muted { background: linear-gradient(180deg, #fff, var(--accent-soft)); }
.tag { font-size: 0.75rem; color: var(--accent); font-weight: 600; }
.card h2 { margin: 0.5rem 0; font-size: 1.15rem; }
.card p { color: var(--muted); line-height: 1.5; flex: 1; margin: 0; }
.cta { color: var(--accent); font-weight: 600; margin-top: 1rem; }
.foot { margin-top: 2.5rem; font-size: 0.9rem; color: var(--muted); }
.foot a { color: var(--accent); text-decoration: none; }
.foot a:hover { text-decoration: underline; }
.foot span { margin: 0 0.5rem; }