/* 全局主题 v2.1 - 对齐首页精美导航风格 */
:root {
  --bg-base: #0a0e1a;
  --bg-card: #111827;
  --theme-gold: #d4af37;
  --theme-gold-light: #f4e4bc;
  --theme-primary: #3684ff;
  --text-primary: #e0e6f0;
  --text-muted: #8899aa;
  --border-color: #1e293b;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Serif SC', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  padding-top: 56px; /* 给fixed导航留空间 */
}

/* ===== 统一顶部导航 - 完全对齐首页风格 ===== */
.nav-unified {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.15);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-family: 'Noto Serif SC', serif;
  font-size: 17px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--theme-gold-light), var(--theme-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-item a {
  display: block;
  padding: 8px 12px;
  color: #bbb;
  text-decoration: none;
  font-size: 13.5px;
  transition: all 0.2s;
  border-radius: 6px;
  white-space: nowrap;
}

.nav-item a:hover {
  color: var(--theme-gold);
  background: rgba(212, 175, 55, 0.06);
}

.nav-item.active a {
  color: var(--theme-gold);
  background: rgba(212, 175, 55, 0.1);
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-lg) 20px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  margin-bottom: var(--space-lg);
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--theme-gold);
}

.breadcrumb .separator {
  margin: 0 8px;
  color: var(--border-color);
}

/* ===== 卡片 ===== */
.card {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid rgba(212, 175, 55, 0.1);
  border-radius: 12px;
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  backdrop-filter: blur(8px);
}

/* ===== 标题 ===== */
h1 { font-size: 28px; margin-bottom: var(--space-sm); }
h2 { font-size: 22px; margin-bottom: var(--space-md); }
h3 { font-size: 18px; margin-bottom: var(--space-sm); }

.text-gold { color: var(--theme-gold); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }

/* ===== 网格 ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }

/* ===== 表格 ===== */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

.table th, .table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  background: rgba(255, 255, 255, 0.03);
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== 徽章 ===== */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.badge-gold { background: rgba(212, 175, 55, 0.2); color: var(--theme-gold); }
.badge-info { background: rgba(54, 132, 255, 0.2); color: var(--theme-primary); }
.badge-success { background: rgba(39, 194, 112, 0.2); color: #27c270; }
.badge-warning { background: rgba(255, 188, 52, 0.2); color: #ffbc34; }
.badge-danger { background: rgba(255, 82, 82, 0.2); color: #ff5252; }

/* ===== 提示框 ===== */
.alert {
  padding: 16px;
  border-radius: 8px;
  margin: var(--space-md) 0;
}

.alert-info { background: rgba(54, 132, 255, 0.1); border-left: 3px solid var(--theme-primary); }
.alert-success { background: rgba(39, 194, 112, 0.1); border-left: 3px solid #27c270; }
.alert-warning { background: rgba(255, 188, 52, 0.1); border-left: 3px solid #ffbc34; }

/* ===== 页脚 ===== */
.footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.trace {
  margin-bottom: var(--space-sm);
  color: var(--theme-gold);
}

/* ===== 返回首页按钮 ===== */
.back-home-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--theme-gold-light), var(--theme-gold));
  color: var(--bg-base);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 20px;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
  z-index: 999;
}

/* ===== 背景网格 ===== */
.bg-grid {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: -1;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none; /* 移动端简化，后续再完善汉堡菜单 */
  }
}