/* ========================================
   综合旗舰版黑料网门户 - 主样式表
   暗色科技风 | 移动端优先 | CSS变量管理
   ======================================== */

/* CSS变量定义 */
:root {
  --color-primary: #00d4ff;
  --color-primary-dark: #0099cc;
  --color-secondary: #7c3aed;
  --color-accent: #f59e0b;
  --color-danger: #ef4444;
  --color-success: #10b981;
  --color-bg-dark: #0a0e1a;
  --color-bg-card: #131a2b;
  --color-bg-card-hover: #1a2340;
  --color-bg-section: #0d1117;
  --color-bg-input: #1e293b;
  --color-text-primary: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #1e293b;
  --color-border-light: #334155;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.15);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --max-width: 1280px;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ========== 头部导航 ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-desktop {
  display: none;
}

.nav-desktop ul {
  display: flex;
  gap: 24px;
}

.nav-desktop a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

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

.nav-desktop a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-desktop a:hover::after,
.nav-desktop a.active::after {
  width: 100%;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端侧边菜单 */
.nav-mobile {
  position: fixed;
  top: var(--header-height);
  right: -100%;
  width: 280px;
  height: calc(100vh - var(--header-height));
  background: var(--color-bg-card);
  border-left: 1px solid var(--color-border);
  padding: 24px;
  transition: right var(--transition-normal);
  overflow-y: auto;
  z-index: 999;
}

.nav-mobile.open {
  right: 0;
}

.nav-mobile ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-mobile a {
  display: block;
  padding: 12px 16px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-mobile a:hover {
  background: var(--color-bg-card-hover);
  color: var(--color-primary);
}

.nav-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 998;
}

.nav-overlay.show {
  display: block;
}

/* ========== 主内容区 ========== */
.main-content {
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 48px 0;
}

.section-alt {
  background: var(--color-bg-section);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.section-desc {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-size: 0.95rem;
}

/* ========== 首屏英雄区 ========== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-dark) 0%, #0d1a2e 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(1.1); opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 搜索框 */
.search-box {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 16px 56px 16px 20px;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  color: var(--color-text-primary);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.search-box input::placeholder {
  color: var(--color-text-muted);
}

.search-box button {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: var(--color-bg-dark);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.search-box button:hover {
  background: var(--color-primary-dark);
}

.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 0;
  display: none;
  box-shadow: var(--shadow-md);
  z-index: 100;
}

.search-suggestions.show {
  display: block;
}

.search-suggestions a {
  display: block;
  padding: 10px 20px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.search-suggestions a:hover {
  background: var(--color-bg-card-hover);
  color: var(--color-primary);
}

/* ========== 数据看板 ========== */
.dashboard {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.dash-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.dash-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.dash-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.dash-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ========== 卡片网格 ========== */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-body {
  padding: 20px;
}

.card-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.card-excerpt {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ========== 榜单列表 ========== */
.rank-list {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.rank-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
}

.rank-tab {
  padding: 12px 20px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.rank-tab.active,
.rank-tab:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.rank-content {
  padding: 16px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.rank-item:last-child {
  border-bottom: none;
}

.rank-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--color-bg-input);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.rank-num.top-1 { background: #f59e0b; color: #000; }
.rank-num.top-2 { background: #94a3b8; color: #000; }
.rank-num.top-3 { background: #cd7f32; color: #000; }

.rank-text {
  flex: 1;
  font-size: 0.9rem;
  color: var(--color-text-primary);
}

.rank-heat {
  font-size: 0.78rem;
  color: var(--color-danger);
  font-family: var(--font-mono);
}

/* ========== FAQ手风琴 ========== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 16px 20px;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg-card-hover);
}

.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 20px 16px;
}

.faq-answer p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

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

.breadcrumb span {
  margin: 0 8px;
}

/* ========== 页面头部 ========== */
.page-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  max-width: 700px;
}

/* ========== 表单 ========== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg-dark);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-bg-dark);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-light);
}

.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary);
}

.btn-accent {
  background: var(--color-secondary);
  color: #fff;
}

.btn-accent:hover {
  background: #6d28d9;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-bg-section);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-bottom a {
  color: var(--color-text-muted);
  margin: 0 8px;
}

.footer-bottom a:hover {
  color: var(--color-primary);
}

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-bg-dark);
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 900;
}

.back-to-top.show {
  display: flex;
}

.back-to-top:hover {
  transform: translateY(-2px);
}

/* ========== PWA安装提示 ========== */
.pwa-prompt {
  position: fixed;
  bottom: 80px;
  left: 20px;
  right: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: none;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 950;
}

.pwa-prompt.show {
  display: flex;
}

.pwa-prompt-text {
  flex: 1;
  font-size: 0.88rem;
  color: var(--color-text-primary);
}

.pwa-prompt .btn {
  padding: 8px 16px;
  font-size: 0.82rem;
}

.pwa-prompt-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

/* ========== 提交成功提示 ========== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--color-success);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 2000;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== 合规提醒条 ========== */
.compliance-bar {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ========== 时间线 ========== */
.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 24px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg-dark);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.timeline-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ========== 标签 ========== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ========== 内页内容区 ========== */
.page-content {
  padding: 40px 0 60px;
}

.content-block {
  margin-bottom: 40px;
}

.content-block h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text-primary);
}

.content-block h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.content-block p {
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  font-size: 0.93rem;
  line-height: 1.8;
}

/* ========== 搜索结果 ========== */
.search-results {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.search-result-item {
  padding: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.search-result-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.search-result-item h3 a {
  color: var(--color-primary);
}

.search-result-item p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}

.search-result-item .result-path {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 6px;
  font-family: var(--font-mono);
}

/* ========== 404页面 ========== */
.error-page {
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.error-page p {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ========== 响应式断点 ========== */
@media (min-width: 480px) {
  .dashboard {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .nav-desktop {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .pwa-prompt {
    left: auto;
    right: 24px;
    max-width: 380px;
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero h1 {
    font-size: 3.5rem;
  }

  .page-header h1 {
    font-size: 2.2rem;
  }
}

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-12 { gap: 12px; }
.hidden { display: none; }