/* 青春绘影 - 主样式表 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #FF6B35;
  --secondary-color: #F7931E;
  --accent-color: #FFA500;
  --dark-color: #1a1a1a;
  --light-color: #f5f5f5;
  --text-color: #333;
  --border-color: #ddd;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #fff;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部导航 */
header {
  background: linear-gradient(135deg, #fff 0%, #f9f9f9 100%);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

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

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

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

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

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  background: #f0f0f0;
  border-radius: 25px;
  padding: 8px 15px;
  gap: 10px;
  cursor: pointer;
  transition: all 0.3s;
}

.search-box:hover {
  background: #e8e8e8;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  width: 150px;
  font-size: 14px;
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--primary-color);
  font-size: 18px;
}

/* Hero区域 */
.hero {
  background: linear-gradient(135deg, rgba(255,107,53,0.1) 0%, rgba(255,165,0,0.05) 100%);
  padding: 60px 0;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,107,53,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--dark-color);
  line-height: 1.2;
}

.hero-text h1 span {
  color: var(--primary-color);
}

.hero-text p {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  font-size: 16px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: 0 4px 15px rgba(255,107,53,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,53,0.4);
}

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

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

.hero-image {
  position: relative;
  z-index: 2;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 15px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

/* 功能模块 */
.features-section {
  margin: 60px 0;
}

.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 50px;
  color: var(--dark-color);
}

.section-title span {
  color: var(--primary-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.feature-card {
  background: white;
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
  border-color: var(--primary-color);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 30px;
  color: white;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.feature-card p {
  color: #666;
  font-size: 14px;
  line-height: 1.6;
}

/* 视频卡片 */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.video-card {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  background: #000;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.video-card:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.video-thumbnail {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
}

.video-card:hover .video-overlay {
  opacity: 1;
}

.play-button {
  width: 60px;
  height: 60px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  transition: all 0.3s;
}

.video-card:hover .play-button {
  transform: scale(1.2);
  background: var(--secondary-color);
}

.video-info {
  padding: 15px;
  background: white;
}

.video-info h4 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--dark-color);
}

.video-stats {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #999;
}

/* FAQ区域 */
.faq-section {
  background: linear-gradient(135deg, rgba(255,107,53,0.05) 0%, rgba(255,165,0,0.05) 100%);
  padding: 60px 0;
  margin: 60px 0;
  border-radius: 15px;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-question {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
  font-weight: 600;
  color: var(--dark-color);
}

.faq-question:hover {
  background: var(--light-color);
  border-color: var(--primary-color);
}

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 20px;
  transition: transform 0.3s;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s;
  padding: 0 20px;
  color: #666;
  font-weight: normal;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 20px;
}

/* 评论区 */
.reviews-section {
  margin: 60px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.review-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  border-left: 4px solid var(--primary-color);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: all 0.3s;
}

.review-card:hover {
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  transform: translateY(-4px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}

.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: white;
  font-weight: 700;
  font-size: 20px;
}

.review-user {
  flex: 1;
}

.review-name {
  font-weight: 600;
  color: var(--dark-color);
  margin-bottom: 3px;
}

.review-role {
  font-size: 12px;
  color: #999;
}

.review-stars {
  color: #FFD700;
  font-size: 14px;
  margin-bottom: 10px;
}

.review-text {
  color: #666;
  font-size: 14px;
  line-height: 1.6;
}

/* 专家展示 */
.experts-section {
  margin: 60px 0;
}

.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.expert-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: all 0.3s;
  text-align: center;
}

.expert-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

.expert-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.expert-info {
  padding: 20px;
}

.expert-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-color);
  margin-bottom: 5px;
}

.expert-title {
  color: var(--primary-color);
  font-size: 14px;
  margin-bottom: 10px;
}

.expert-bio {
  color: #666;
  font-size: 13px;
  line-height: 1.5;
  margin-bottom: 15px;
}

.expert-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.expert-actions a {
  padding: 8px 15px;
  border-radius: 20px;
  font-size: 12px;
  text-decoration: none;
  transition: all 0.3s;
}

.expert-actions .btn-primary {
  padding: 8px 15px;
  font-size: 12px;
}

/* 合作品牌 */
.partners-section {
  margin: 60px 0;
  text-align: center;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
  align-items: center;
  margin-top: 40px;
}

.partner-logo {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
  cursor: pointer;
}

.partner-logo:hover {
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(255,107,53,0.1);
  transform: scale(1.05);
}

.partner-logo img {
  max-width: 80%;
  max-height: 60px;
  object-fit: contain;
}

/* 联系方式 */
.contact-section {
  background: linear-gradient(135deg, var(--dark-color) 0%, #2a2a2a 100%);
  color: white;
  padding: 60px 0;
  margin: 60px 0;
  border-radius: 15px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.contact-item h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.contact-item p {
  color: #ddd;
  font-size: 14px;
  line-height: 1.8;
}

.contact-item a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

.contact-item a:hover {
  color: var(--secondary-color);
}

/* 页脚 */
footer {
  background: var(--dark-color);
  color: #ddd;
  padding: 40px 0 20px;
  border-top: 1px solid #444;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  color: white;
  margin-bottom: 15px;
  font-size: 16px;
}

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

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section a {
  color: #ddd;
  text-decoration: none;
  transition: color 0.3s;
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid #444;
  padding-top: 20px;
  text-align: center;
  font-size: 14px;
  color: #999;
}

.footer-bottom p {
  margin-bottom: 10px;
}

.update-time {
  color: var(--primary-color);
  font-weight: 600;
}

/* 社交分享 */
.social-share {
  display: flex;
  gap: 15px;
  justify-content: center;
  margin: 30px 0;
  flex-wrap: wrap;
}

.share-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: white;
  transition: all 0.3s;
  font-size: 18px;
  border: none;
  cursor: pointer;
}

.share-wechat {
  background: #09B981;
}

.share-weibo {
  background: #E1306C;
}

.share-douyin {
  background: #000;
}

.share-bilibili {
  background: #00A0E9;
}

.share-btn:hover {
  transform: scale(1.2);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .header-top {
    flex-direction: column;
    gap: 15px;
  }

  nav ul {
    flex-direction: column;
    gap: 15px;
    width: 100%;
    text-align: center;
  }

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

  .hero-text h1 {
    font-size: 36px;
  }

  .hero-text p {
    font-size: 16px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .section-title {
    font-size: 28px;
  }

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

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }

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

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .search-box input {
    width: 100px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .section-title {
    font-size: 24px;
  }

  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }

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

  nav ul {
    gap: 10px;
  }

  nav a {
    font-size: 14px;
  }
}

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

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

/* 打字效果 */
@keyframes typing {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

.typing {
  overflow: hidden;
  border-right: 3px solid var(--primary-color);
  animation: typing 3s steps(40, end);
}


/* 品牌Logo图片适配：保持原有布局，仅替换图标资源 */
.logo img.logo-icon,
img.logo-icon {
  object-fit: contain;
  background: transparent;
  padding: 0;
}