:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
}

.page {
  max-width: 1220px;
  margin: 0 auto;
  padding: 40px 12px 48px;
  position: relative;
  z-index: 1;
}

/* --- 两侧背景光晕装饰 --- */
.bg-shape {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
  pointer-events: none;
}

.bg-shape-left {
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  max-width: 600px;
  max-height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, rgba(37, 99, 235, 0) 70%);
}

.bg-shape-right {
  bottom: -10%;
  right: -10%;
  width: 40vw;
  height: 40vw;
  max-width: 500px;
  max-height: 500px;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.1) 0%, rgba(147, 51, 234, 0) 70%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 22px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 15px;
  font-weight: 500;
}

.nav-link {
  color: var(--muted);
  transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.tag {
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--primary);
  background: var(--primary-soft);
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 860px) {
  .grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}