/* ==========================================
   校花品牌网站 - 外部 CSS 样式表
   原创设计：青春校园 + 现代科技融合美学
   ========================================== */

/* 1. 全局样式与重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  line-height: 1.6;
  color: #2C3E50;
  background-color: #F8F9FA;
  overflow-x: hidden;
}

/* 2. 色彩系统 */
:root {
  --primary-color: #FF6B9D;
  --secondary-color: #4A90E2;
  --bg-light: #F8F9FA;
  --text-dark: #2C3E50;
  --border-light: #E8EEF5;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

/* 3. 头部导航 */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text-dark);
  transition: var(--transition);
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

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

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

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

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after {
  width: 100%;
}

.search-box {
  flex: 0 1 250px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: 25px;
  background-color: var(--bg-light);
  font-size: 0.9rem;
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
  background-color: var(--white);
}

.cta-btn {
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: 25px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background-color: #FF5A8E;
}

.cta-btn:active {
  transform: scale(0.97);
}

/* 4. Hero 区 */
.hero {
  margin-top: 80px;
  background: linear-gradient(135deg, #FF6B9D 0%, #FFB6D9 25%, #E8F4F8 75%, #4A90E2 100%);
  background-attachment: fixed;
  padding: 80px 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(20px); }
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  color: var(--white);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  animation: slideInDown 0.8s ease;
}

.hero p {
  font-size: 1.3rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  animation: slideInUp 0.8s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: slideInUp 0.8s ease 0.4s both;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn-primary {
  padding: 1rem 2.5rem;
  background-color: var(--white);
  color: var(--primary-color);
  border: none;
  border-radius: 30px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  padding: 1rem 2.5rem;
  background-color: transparent;
  color: var(--white);
  border: 2px solid var(--white);
  border-radius: 30px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--white);
  color: var(--primary-color);
}

/* 5. 内容模块通用样式 */
.section {
  padding: 60px 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 3rem;
  text-align: center;
  color: var(--text-dark);
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

/* 6. 视频卡片网格 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.card {
  background-color: var(--white);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

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

.card-image {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background-color: var(--bg-light);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background-color: rgba(255, 107, 157, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  opacity: 0;
  transition: var(--transition);
  cursor: pointer;
}

.card:hover .play-button {
  opacity: 1;
}

.card-content {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: #7F8C8D;
  margin-bottom: 1rem;
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* 7. FAQ 部分 */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--white);
  border-left: 4px solid var(--primary-color);
  padding: 1.5rem;
  margin-bottom: 1rem;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.faq-question {
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '▼';
  font-size: 0.8rem;
  color: var(--primary-color);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  color: #555;
  line-height: 1.8;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 8. 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.review-card {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.review-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
}

.review-info h4 {
  margin: 0;
  color: var(--text-dark);
  font-size: 1rem;
}

.review-rating {
  color: #FFB800;
  font-size: 0.9rem;
}

.review-text {
  color: #555;
  line-height: 1.7;
  font-size: 0.95rem;
}

/* 9. 页脚 */
footer {
  background: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
  color: var(--white);
  padding: 3rem 2rem 1rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
  color: var(--primary-color);
}

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

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.qrcode-section {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 2rem;
}

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

.qrcode-item img {
  width: 120px;
  height: 120px;
  margin-bottom: 0.5rem;
  border-radius: 8px;
}

.qrcode-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}

/* 10. 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem;
  }

  .nav-menu {
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    order: 3;
  }

  .search-box {
    flex: 1 1 100%;
    order: 2;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .hero-buttons {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

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

  .qrcode-section {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 40px 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .section {
    padding: 40px 1rem;
  }

  .navbar {
    padding: 0.75rem;
  }

  .nav-menu {
    gap: 0.5rem;
  }
}

/* 11. 懒加载占位符 */
.skeleton {
  background: linear-gradient(90deg, var(--bg-light) 25%, rgba(0, 0, 0, 0.05) 50%, var(--bg-light) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 12. 工具类 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

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

.mt-4 {
  margin-top: 2rem;
}

.mb-4 {
  margin-bottom: 2rem;
}

.hidden {
  display: none;
}

.visible {
  display: block;
}