/* ===== 推广站主样式 ===== */

:root {
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --orange: #ff6a00;
  --green: #22c55e;
  --indigo: #6366f1;
  --blue: #2563eb;
  --border: #e5e7eb;
  --radius: 8px;
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

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

/* 导航 */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: #fff; border-bottom: 1px solid var(--border);
  height: 56px; display: flex; align-items: center; padding: 0 24px;
}
.nav-brand { font-size: 18px; font-weight: 700; color: var(--text); }
.nav-links { margin-left: auto; display: flex; gap: 20px; }
.nav-links a { color: var(--text-secondary); font-size: 14px; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* 通用容器 */
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* Hero */
.hero {
  margin-top: 56px; padding: 60px 0 40px; text-align: center;
}
.hero h1 { font-size: 28px; margin-bottom: 12px; }
.hero p { color: var(--text-secondary); font-size: 16px; max-width: 520px; margin: 0 auto; }

/* 推广卡片 */
.promo-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  margin-bottom: 48px;
}
.promo-card {
  background: var(--card); border-radius: var(--radius); padding: 24px;
  border: 1px solid var(--border); border-top: 3px solid var(--border);
  transition: box-shadow 0.2s;
}
.promo-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.promo-card.orange { border-top-color: var(--orange); }
.promo-card.green { border-top-color: var(--green); }
.promo-card.indigo { border-top-color: var(--indigo); }
.promo-card .tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 2px 8px; border-radius: 4px; color: #fff; margin-bottom: 12px;
}
.promo-card.orange .tag { background: var(--orange); }
.promo-card.green .tag { background: var(--green); }
.promo-card.indigo .tag { background: var(--indigo); }
.promo-card h3 { font-size: 18px; margin-bottom: 8px; }
.promo-card p { color: var(--text-secondary); font-size: 14px; margin-bottom: 16px; }
.promo-card .invite-code {
  background: #f3f4f6; padding: 8px 12px; border-radius: 4px;
  font-family: monospace; font-size: 14px; margin-bottom: 12px;
  display: flex; align-items: center; justify-content: space-between;
}
.promo-card .invite-code button {
  background: none; border: none; color: var(--blue); cursor: pointer;
  font-size: 13px; font-family: var(--font);
}
.promo-card .btn {
  display: inline-block; padding: 8px 20px; border-radius: 4px;
  color: #fff; font-size: 14px; font-weight: 500; text-align: center;
  transition: opacity 0.2s;
}
.promo-card .btn:hover { opacity: 0.85; text-decoration: none; }
.promo-card.orange .btn { background: var(--orange); }
.promo-card.green .btn { background: var(--green); }
.promo-card.indigo .btn { background: var(--indigo); }

/* Tab 内容区 */
.tabs { margin-bottom: 48px; }
.tab-nav { display: flex; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
.tab-btn {
  padding: 10px 20px; border: none; background: none;
  font-size: 15px; color: var(--text-secondary); cursor: pointer;
  font-family: var(--font); border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: color 0.2s;
}
.tab-btn.active { color: var(--text); border-bottom-color: var(--blue); font-weight: 600; }
.tab-btn:hover { color: var(--text); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* 文章列表 */
.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-item {
  background: var(--card); border-radius: var(--radius); padding: 20px 24px;
  border: 1px solid var(--border);
}
.article-item h3 { font-size: 16px; margin-bottom: 6px; }
.article-item h3 a { color: var(--text); }
.article-item h3 a:hover { color: var(--blue); text-decoration: none; }
.article-item .meta { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.article-item .summary { font-size: 14px; color: var(--text-secondary); }

/* 页脚 */
.footer {
  background: #fff; border-top: 1px solid var(--border);
  padding: 32px 0; text-align: center; color: var(--text-secondary); font-size: 13px;
}
.footer a { color: var(--text-secondary); margin: 0 8px; }

/* 响应式 */
@media (max-width: 768px) {
  .promo-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; }
  .hero h1 { font-size: 22px; }
}

/* ===== 文章详情页 ===== */
.detail { margin-top: 72px; padding-bottom: 48px; }
.breadcrumb { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--blue); }
.breadcrumb span { margin: 0 6px; }
.detail-header h1 { font-size: 24px; margin-bottom: 12px; line-height: 1.4; }
.detail-header .meta { font-size: 13px; color: var(--text-secondary); margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.detail-body { background: var(--card); border-radius: var(--radius); padding: 28px 32px; border: 1px solid var(--border); line-height: 1.85; }
.detail-body h2 { font-size: 20px; margin: 28px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.detail-body h3 { font-size: 17px; margin: 20px 0 10px; }
.detail-body p { margin-bottom: 14px; }
.detail-body ul, .detail-body ol { margin: 10px 0 14px 24px; }
.detail-body li { margin-bottom: 6px; }
.detail-body strong { color: var(--text); }
/* 5118推广横幅 */
.promo-banner {
  margin-top: 28px; padding: 20px 24px; border-radius: var(--radius);
  background: linear-gradient(135deg, #ecfdf5, #f0fdf4); border: 1px solid #bbf7d0;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.promo-banner .info h3 { font-size: 16px; margin-bottom: 4px; color: #15803d; }
.promo-banner .info p { font-size: 13px; color: var(--text-secondary); }
.promo-banner .btn-5118 {
  display: inline-block; padding: 10px 24px; border-radius: 4px;
  background: var(--green); color: #fff; font-weight: 500; font-size: 14px;
  transition: opacity 0.2s; white-space: nowrap;
}
.promo-banner .btn-5118:hover { opacity: 0.85; text-decoration: none; }
/* 上下篇导航 */
.nav-articles {
  display: flex; justify-content: space-between; margin-top: 32px; gap: 16px;
}
.nav-articles a {
  flex: 1; padding: 16px 20px; background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--border); font-size: 14px; color: var(--text);
  transition: box-shadow 0.2s;
}
.nav-articles a:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.06); text-decoration: none; }
.nav-articles a .label { font-size: 12px; color: var(--text-secondary); display: block; margin-bottom: 4px; }
@media (max-width: 768px) {
  .detail-body { padding: 20px 16px; }
  .promo-banner { flex-direction: column; text-align: center; }
  .nav-articles { flex-direction: column; }
}