/* ========================================
   灭庄高手网 - 现代科技风格
   版本：2.0
   最后更新：2026-03-04
   风格：深色科技主题
   ======================================== */

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

:root {
  /* 深色科技主题配色 */
  --bg-primary: #0a0e27;
  --bg-secondary: #111633;
  --bg-card: #1a1f44;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* 强调色 */
  --primary: #00d4ff;
  --primary-glow: rgba(0, 212, 255, 0.3);
  --secondary: #7b2cbf;
  --accent: #f72585;
  --success: #06d6a0;
  --warning: #ffd166;
  --danger: #ef476f;
  
  /* 文字颜色 */
  --text-primary: #ffffff;
  --text-secondary: #b8b8d1;
  --text-muted: #6b7280;
  
  /* 边框和阴影 */
  --border-color: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(0, 212, 255, 0.5);
  --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 10px 40px rgba(0, 0, 0, 0.5);
  --glow-primary: 0 0 20px var(--primary-glow);
  --glow-accent: 0 0 20px rgba(247, 37, 133, 0.3);
  
  /* 过渡动画 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 背景动画效果 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
  animation: bgPulse 8s ease-in-out infinite;
}

@keyframes bgPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--secondary), var(--accent));
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 14, 39, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 14, 39, 0.98);
  box-shadow: var(--shadow-md);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  position: relative;
}

.logo-icon {
  width: 45px;
  height: 45px;
  background: var(--bg-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  font-size: 1.5rem;
  box-shadow: var(--glow-primary);
  position: relative;
  overflow: hidden;
}

.logo-icon::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-menu li a {
  display: block;
  padding: 12px 20px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 10px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.nav-menu li a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(123, 44, 191, 0.1));
  opacity: 0;
  transition: var(--transition);
}

.nav-menu li a:hover::before,
.nav-menu li a.active::before {
  opacity: 1;
}

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

.nav-menu li a.active::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  box-shadow: var(--glow-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.btn {
  padding: 12px 28px;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 0.95rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--bg-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: var(--bg-primary);
  box-shadow: var(--glow-primary);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 28px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========================================
   Hero 区域 - 科技感设计
   ======================================== */
.hero {
  padding-top: 140px;
  padding-bottom: 100px;
  background: radial-gradient(ellipse at top, rgba(102, 126, 234, 0.15) 0%, transparent 70%),
              radial-gradient(ellipse at bottom, rgba(118, 75, 162, 0.1) 0%, transparent 70%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.5;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translateY(0); }
  100% { transform: translateY(50px); }
}

.hero-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 30px;
  position: relative;
  z-index: 1;
}

.hero-content {
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 50px;
  font-size: 0.875rem;
  color: var(--primary);
  margin-bottom: 25px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 25px;
  line-height: 1.2;
  background: linear-gradient(135deg, #ffffff 0%, var(--primary) 50%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.2); }
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 45px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 80px;
}

.hero-btn {
  padding: 16px 40px;
  font-size: 1.05rem;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
  position: relative;
}

.hero-btn-primary {
  background: var(--bg-gradient);
  color: white;
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.hero-btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.6);
}

.hero-btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 2px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.hero-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  box-shadow: var(--glow-primary);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), transparent);
  opacity: 0;
  transition: var(--transition);
}

.stat-card:hover::before {
  opacity: 1;
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--glow-primary);
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ========================================
   通用区块样式
   ======================================== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 70px;
}

.section-tag {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 50px;
  font-size: 0.875rem;
  color: var(--primary);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 30px;
}

/* ========================================
   卡片设计 - 玻璃态风格
   ======================================== */
.card {
  background: rgba(26, 31, 68, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  transition: var(--transition);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bg-gradient);
  transform: scaleX(0);
  transition: var(--transition);
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-lg), var(--glow-primary);
}

.card-header {
  padding: 25px;
  border-bottom: 1px solid var(--border-color);
}

.card-body {
  padding: 25px;
}

.card-footer {
  padding: 20px 25px;
  background: rgba(0, 0, 0, 0.2);
  border-top: 1px solid var(--border-color);
}

/* ========================================
   数据卡片 - 仪表盘风格
   ======================================== */
.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.data-card {
  background: linear-gradient(135deg, rgba(26, 31, 68, 0.8), rgba(17, 22, 51, 0.8));
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.data-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  opacity: 0;
  transition: var(--transition);
}

.data-card:hover::after {
  opacity: 1;
}

.data-card:hover {
  transform: translateY(-5px) scale(1.02);
  border-color: var(--primary);
  box-shadow: var(--glow-primary);
}

.data-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.data-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.data-card-badge {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-hot {
  background: linear-gradient(135deg, #ef476f, #ffd166);
  color: white;
  box-shadow: 0 4px 15px rgba(239, 71, 111, 0.4);
}

.badge-new {
  background: linear-gradient(135deg, #06d6a0, #00d4ff);
  color: white;
  box-shadow: 0 4px 15px rgba(6, 214, 160, 0.4);
}

.badge-recommend {
  background: linear-gradient(135deg, #7b2cbf, #f72585);
  color: white;
  box-shadow: 0 4px 15px rgba(123, 44, 191, 0.4);
}

.data-card-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 15px;
  display: block;
}

.data-card-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.data-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.data-card-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition);
}

.data-card-link:hover {
  color: var(--accent);
  gap: 8px;
}

/* ========================================
   论坛卡片
   ======================================== */
.forum-card {
  background: rgba(26, 31, 68, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px;
  margin-bottom: 25px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.forum-card:hover {
  border-color: var(--primary);
  box-shadow: var(--glow-primary);
  transform: translateX(5px);
}

.forum-card-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.avatar {
  width: 55px;
  height: 55px;
  border-radius: 16px;
  background: var(--bg-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
  box-shadow: var(--glow-primary);
}

.forum-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.forum-card-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.forum-card-title a:hover {
  color: var(--primary);
}

.forum-card-meta {
  display: flex;
  gap: 15px;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.forum-card-body {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  padding-left: 75px;
}

.forum-card-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-left: 75px;
}

.tag {
  padding: 6px 16px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

.tag:hover {
  background: var(--primary);
  color: var(--bg-primary);
  box-shadow: var(--glow-primary);
}

.forum-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  padding-left: 75px;
}

.forum-stats {
  display: flex;
  gap: 25px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.forum-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.forum-stat:hover {
  color: var(--primary);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 50px;
}

.footer-brand {
  max-width: 350px;
}

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-description {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 25px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 45px;
  height: 45px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
  font-size: 1.25rem;
}

.social-link:hover {
  background: var(--bg-gradient);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--glow-primary);
}

.footer-links h4 {
  font-size: 1.125rem;
  margin-bottom: 25px;
  font-weight: 600;
  color: var(--text-primary);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 15px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 8px;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-copyright a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

.footer-legal {
  display: flex;
  gap: 30px;
}

.footer-legal a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

/* ========================================
   模态框
   ======================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  width: 100%;
  max-width: 480px;
  padding: 40px;
  transform: translateY(30px) scale(0.95);
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  text-align: center;
  margin-bottom: 35px;
}

.modal-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 10px;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--danger);
  border-color: var(--danger);
  transform: rotate(90deg);
}

.form-group {
  margin-bottom: 25px;
}

.form-label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  font-size: 1rem;
  color: var(--text-primary);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: var(--glow-primary);
}

.form-control::placeholder {
  color: var(--text-muted);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1200px) {
  .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .data-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 30px;
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-actions {
    display: none;
  }
  
  .hero {
    padding-top: 120px;
    padding-bottom: 80px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .forum-card-body,
  .forum-card-footer,
  .forum-card-tags {
    padding-left: 0;
  }
  
  .forum-card-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .avatar {
    margin: 0 auto;
  }
}

/* ========================================
   工具类
   ======================================== */
.text-center { text-align: center; }
.mt-3 { margin-top: 2rem; }
.mt-4 { margin-top: 3rem; }
.mb-3 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 3rem; }

/* ========================================
   动画效果
   ======================================== */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.slide-up {
  animation: slideUp 0.8s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 加载中状态 */
.loading {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}