/* ========================================
   NXCNC · 牛X数控 - 公共基础样式
   适用于所有页面：index.html, about.html, ranking.html, feed.html, 404.html
   ======================================== */

/* ---- CSS 变量 ---- */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-hover: #f0f4f8;
  --bg-card: #ffffff;
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent-cyan: #0891b2;
  --accent-blue: #3b82f6;
  --accent-purple: #7c3aed;
  --accent-orange: #f97316;
  --accent-green: #059669;
  --accent-red: #dc2626;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
}

/* ---- 暗色主题 ---- */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #0f0f1a;
  --bg-hover: #2a2a3e;
  --bg-card: #1e1e32;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #334155;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* ---- 全局重置 ---- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', -apple-system, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ---- 顶部导航栏 ---- */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 32px;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  margin-right: 48px;
}

.nav-brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
}

.nav-brand-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-item {
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item i {
  font-size: 16px;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--accent-cyan);
}

.nav-item.active {
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.1), rgba(59, 130, 246, 0.05));
  color: var(--accent-cyan);
}

/* ---- 导航下拉菜单（悬停触发） ---- */
.nav-dropdown-wrap {
  position: relative;
}
.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  min-width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 8px 0;
  z-index: 1001;
}
.nav-dropdown-wrap:hover > .nav-dropdown,
.nav-dropdown-wrap:focus-within > .nav-dropdown {
  display: block;
}
.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  font-size: 13px;
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.15s;
  white-space: nowrap;
}
.nav-dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--accent-cyan);
}
.nav-dropdown-item i {
  width: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
}
.nav-dropdown-item:hover i {
  color: var(--accent-cyan);
}
.nav-dropdown-item.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}
.nav-dropdown-badge {
  margin-left: auto;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
}
.badge-online {
  background: rgba(5,150,105,0.1);
  color: var(--accent-green);
}
.badge-dev {
  background: rgba(249,115,22,0.1);
  color: var(--accent-orange);
}

/* ---- 导航栏返回按钮 ---- */
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
}

.nav-back:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ---- 主题切换按钮 ---- */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  margin-right: 24px;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
  background: var(--bg-hover);
}

/* ---- 主内容区 ---- */
.main-content {
  margin-top: 64px;
  padding: 32px;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- 页面标题 ---- */
.page-header {
  text-align: center;
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* ---- 滚动条样式 ---- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ---- 渐入动画 ---- */
.fade-up {
  animation: fadeUp 0.6s ease forwards;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- 响应式：导航栏移动端适配 ---- */
@media (max-width: 900px) {
  .top-nav {
    padding: 0 16px;
  }
  .nav-brand-text {
    display: none;
  }
  .nav-menu {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 768px) {
  .top-nav {
    padding: 0 16px;
  }
  .nav-brand-text,
  .nav-item span {
    display: none;
  }
  .main-content {
    padding: 20px 16px;
  }
}

/* ---- 微信登录组件（导航栏右侧） ---- */
.nav-auth {
  display: flex;
  align-items: center;
  margin-left: 16px;
  flex-shrink: 0;
}

.nav-login-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  background: linear-gradient(135deg, #07c160, #06ad56);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.25s ease;
}

.nav-login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(7, 193, 96, 0.35);
}

.nav-login-btn i {
  font-size: 15px;
}

.nav-user {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 6px 3px 3px;
  border-radius: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  max-width: 200px;
}

.nav-user-avatar {
  width: 32px;
  height: 32px;
  max-width: 32px;
  max-height: 32px;
  display: block;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-hover);
  flex-shrink: 0;
}

.nav-user-avatar--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.nav-user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-logout-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.nav-logout-btn:hover {
  background: var(--bg-hover);
  color: var(--accent-red);
}

@media (max-width: 768px) {
  .nav-user-name {
    display: none;
  }
  .nav-auth {
    margin-left: 10px;
  }
  .nav-login-btn span {
    display: none;
  }
  .nav-login-btn {
    padding: 8px 12px;
  }
}