/* 兄妹乱伦 - 原创品牌网站 CSS 样式表 */
/* 设计理念：现代简约 + 动漫社区融合 + 影视传媒专业感 */

:root {
  /* 品牌色系 */
  --primary-color: #FF6B6B;
  --secondary-color: #4ECDC4;
  --accent-color: #FFE66D;
  --dark-bg: #1A1A2E;
  --light-bg: #F7F7F7;
  --text-dark: #2D3436;
  --text-light: #FFFFFF;
  --border-color: #E0E0E0;
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
  
  /* 字体 */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-family-zh: '"Microsoft YaHei", "微软雅黑", SimHei, sans-serif';
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family), var(--font-family-zh);
  color: var(--text-dark);
  background-color: var(--light-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-md);
}

/* 头部导航 */
header {
  background: var(--text-light);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.2rem;
}

/* 导航菜单 */
nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

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

/* 搜索框 */
.search-container {
  position: relative;
  width: 250px;
}

.search-box {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: 25px;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  background: var(--light-bg);
}

.search-box:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 10px rgba(255, 107, 107, 0.2);
}

.search-icon {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dark);
  cursor: pointer;
}

/* 英雄区 */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text-light);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="1200" height="600" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

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

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary-color);
  color: var(--text-light);
}

.btn-primary:hover {
  background: #FF5252;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background: var(--secondary-color);
  color: var(--text-light);
}

.btn-secondary:hover {
  background: #45B8AE;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--text-light);
  color: var(--text-light);
}

.btn-outline:hover {
  background: var(--text-light);
  color: var(--primary-color);
}

/* 内容区块 */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary-color);
  margin: var(--spacing-md) auto 0;
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: #666;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* 卡片网格 */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* 卡片样式 */
.card {
  background: var(--text-light);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--light-bg);
}

.card-content {
  padding: var(--spacing-md);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.card-text {
  color: #666;
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #999;
}

/* 视频卡片 */
.video-card {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
}

.video-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.video-card:hover .video-card-image {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255, 107, 107, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.3s ease;
  cursor: pointer;
}

.video-card:hover .video-play-btn {
  opacity: 1;
}

.video-play-btn::after {
  content: '▶';
  color: white;
  font-size: 1.5rem;
  margin-left: 3px;
}

/* 专家卡片 */
.expert-card {
  text-align: center;
  padding: var(--spacing-lg);
}

.expert-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-md);
  object-fit: cover;
  border: 4px solid var(--primary-color);
  transition: transform 0.3s ease;
}

.expert-card:hover .expert-avatar {
  transform: scale(1.05);
}

.expert-name {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.expert-title {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.expert-bio {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.expert-links {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
}

.expert-link {
  display: inline-block;
  width: 35px;
  height: 35px;
  background: var(--light-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--primary-color);
  transition: all 0.3s ease;
}

.expert-link:hover {
  background: var(--primary-color);
  color: white;
}

/* FAQ 部分 */
.faq-item {
  background: var(--text-light);
  border-left: 4px solid var(--primary-color);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.faq-item:hover {
  box-shadow: var(--shadow);
}

.faq-question {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-toggle {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  color: #666;
  display: none;
  margin-top: var(--spacing-md);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 用户评论 */
.review-item {
  background: var(--text-light);
  padding: var(--spacing-lg);
  border-radius: 12px;
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow);
}

.review-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.review-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin-right: var(--spacing-md);
  object-fit: cover;
}

.review-user-info h4 {
  margin-bottom: var(--spacing-xs);
}

.review-rating {
  color: var(--accent-color);
}

.review-text {
  color: #666;
  line-height: 1.8;
}

/* 底部 */
footer {
  background: var(--dark-bg);
  color: var(--text-light);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

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

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: #999;
}

.footer-qr {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin: var(--spacing-lg) 0;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
}

.qr-item p {
  margin-top: var(--spacing-sm);
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  nav ul {
    gap: var(--spacing-md);
  }

  .search-container {
    width: 150px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

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

  .header-top {
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }

  nav ul {
    order: 3;
    width: 100%;
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .section {
    padding: var(--spacing-lg) 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  nav ul {
    gap: var(--spacing-sm);
  }

  .search-container {
    display: none;
  }
}

/* 动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in {
  animation: slideIn 0.6s ease-out;
}

/* 实用类 */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.hidden {
  display: none;
}

.visible {
  display: block;
}