/* ============================================
   小蓝视频 (hibq64.cn) - 原创样式表
   配色：深海蓝黑 + 活力橙红 + 清新青绿
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --primary: #1A1F36;
  --accent: #FF6B35;
  --teal: #4ECDC4;
  --bg: #F7F8FC;
  --text: #2D3142;
  --card: #FFFFFF;
  --border: #E2E5F1;
  --shadow: 0 4px 20px rgba(26,31,54,0.08);
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--teal);
}

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

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

/* === 头部导航 === */
.site-header {
  background: linear-gradient(135deg, var(--primary), #2D4059);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.site-logo img {
  height: 48px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-nav a {
  color: rgba(255,255,255,0.85);
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: #fff;
  background: rgba(255,107,53,0.2);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* === 搜索框 === */
.search-bar {
  background: rgba(26,31,54,0.6);
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.search-bar .container {
  display: flex;
  justify-content: center;
}

.search-wrap {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.1);
  border-radius: 24px;
  padding: 4px 4px 4px 20px;
  width: 100%;
  max-width: 560px;
  border: 1px solid rgba(255,255,255,0.15);
  transition: var(--transition);
}

.search-wrap:focus-within {
  background: rgba(255,255,255,0.18);
  border-color: var(--teal);
}

.search-wrap input {
  flex: 1;
  border: none;
  background: transparent;
  color: #fff;
  font-size: 14px;
  outline: none;
  padding: 8px 0;
}

.search-wrap input::placeholder {
  color: rgba(255,255,255,0.5);
}

.search-wrap button {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 10px 24px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.search-wrap button:hover {
  background: #e85a28;
}

/* === Hero Banner === */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, var(--primary), #2D4059);
  overflow: hidden;
  padding: 80px 0;
}

.hero-bg {
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
}

.hero-content h1 {
  font-size: 42px;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
  font-weight: 700;
}

.hero-content h1 span {
  color: var(--accent);
}

.hero-content p {
  color: rgba(255,255,255,0.8);
  font-size: 17px;
  margin-bottom: 28px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: #e85a28;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255,107,53,0.3);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid var(--teal);
  transition: var(--transition);
  cursor: pointer;
}

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

/* === 通用板块 === */
.section {
  padding: 70px 0;
}

.section-alt {
  background: #fff;
}

.section-dark {
  background: linear-gradient(135deg, var(--primary), #2D4059);
  color: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.section-dark .section-header h2 {
  color: #fff;
}

.section-header p {
  color: #6B7294;
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-header p {
  color: rgba(255,255,255,0.7);
}

.section-tag {
  display: inline-block;
  background: rgba(78,205,196,0.12);
  color: var(--teal);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.section-dark .section-tag {
  background: rgba(78,205,196,0.2);
}

/* === 视频卡片网格 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.video-card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(26,31,54,0.15);
}

.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}

.video-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(255,107,53,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}

.video-card:hover .play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: #8B90A5;
  font-size: 13px;
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.video-tags {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.video-tags span {
  background: rgba(78,205,196,0.1);
  color: var(--teal);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
}

/* === 特色模块网格 === */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--teal);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 28px;
}

.feature-icon.orange { background: rgba(255,107,53,0.12); color: var(--accent); }
.feature-icon.teal { background: rgba(78,205,196,0.12); color: var(--teal); }
.feature-icon.purple { background: rgba(130,87,229,0.12); color: #8257E5; }

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--primary);
}

.feature-card p {
  color: #6B7294;
  font-size: 14px;
  line-height: 1.7;
}

/* === AI赋能区域 === */
.ai-section {
  position: relative;
  overflow: hidden;
}

.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.ai-img img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.ai-list {
  list-style: none;
}

.ai-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.ai-list li:last-child {
  border-bottom: none;
}

.ai-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.ai-list h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}

.ai-list p {
  color: #6B7294;
  font-size: 14px;
}

/* === 专家团队 === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.expert-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-4px);
}

.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--teal);
}

.expert-card h3 {
  font-size: 17px;
  color: var(--primary);
  margin-bottom: 4px;
}

.expert-card .role {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

.expert-card p {
  color: #6B7294;
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 14px;
}

.expert-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.expert-btns a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
}

.expert-btns .btn-sm-primary {
  background: var(--accent);
  color: #fff;
}

.expert-btns .btn-sm-outline {
  border: 1px solid var(--teal);
  color: var(--teal);
}

/* === 合作品牌墙 === */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  align-items: center;
}

.brand-wall .brand-item {
  background: var(--card);
  padding: 16px 28px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  font-size: 16px;
  font-weight: 600;
  color: #6B7294;
  transition: var(--transition);
}

.brand-wall .brand-item:hover {
  color: var(--accent);
  transform: scale(1.05);
}

/* === How-To指南 === */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.howto-step {
  text-align: center;
  position: relative;
}

.step-num {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), #FF8F6B);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin: 0 auto 16px;
}

.howto-step h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 8px;
}

.howto-step p {
  color: #6B7294;
  font-size: 14px;
}

/* === FAQ === */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-arrow {
  transition: transform 0.3s ease;
  font-size: 20px;
  color: var(--accent);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: #6B7294;
  line-height: 1.8;
  font-size: 14px;
}

/* === 用户评论 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.review-stars {
  color: #FFC107;
  font-size: 16px;
  margin-bottom: 12px;
}

.review-text {
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}

.review-author-info strong {
  display: block;
  font-size: 14px;
  color: var(--primary);
}

.review-author-info span {
  font-size: 12px;
  color: #8B90A5;
}

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info-list {
  list-style: none;
}

.contact-info-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.85);
  font-size: 15px;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(78,205,196,0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.qrcode-group {
  display: flex;
  gap: 24px;
  justify-content: center;
  align-items: flex-start;
}

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

.qrcode-item img {
  width: 140px;
  height: 140px;
  border-radius: 8px;
  margin-bottom: 8px;
}

.qrcode-item p {
  color: rgba(255,255,255,0.7);
  font-size: 13px;
}

/* === 页脚 === */
.site-footer {
  background: #0E1225;
  padding: 48px 0 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand p {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 12px;
}

.footer-links h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 14px;
  padding: 4px 0;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  color: rgba(255,255,255,0.4);
  font-size: 13px;
}

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

.social-share a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  transition: var(--transition);
}

.social-share a:hover {
  background: var(--accent);
  color: #fff;
}

/* === 弹幕区域 === */
.danmaku-area {
  position: relative;
  height: 120px;
  overflow: hidden;
  background: rgba(26,31,54,0.03);
  border-radius: var(--radius);
  margin-top: 24px;
}

.danmaku-item {
  position: absolute;
  white-space: nowrap;
  color: var(--text);
  font-size: 14px;
  padding: 4px 12px;
  background: rgba(255,255,255,0.9);
  border-radius: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  animation: danmaku-scroll linear infinite;
}

@keyframes danmaku-scroll {
  from { transform: translateX(100vw); }
  to { transform: translateX(-100%); }
}

/* === MCP Widget === */
.mcp-widget {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.mcp-widget h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 12px;
}

.mcp-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #6B7294;
  font-size: 14px;
}

.mcp-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ADE80;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* === 面包屑 === */
.breadcrumb {
  padding: 16px 0;
  font-size: 14px;
  color: #8B90A5;
}

.breadcrumb a {
  color: #6B7294;
}

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

.breadcrumb span {
  margin: 0 8px;
  color: #C5C9DB;
}

/* === 内页通用 === */
.page-hero {
  background: linear-gradient(135deg, var(--primary), #2D4059);
  padding: 48px 0;
  text-align: center;
}

.page-hero h1 {
  color: #fff;
  font-size: 36px;
  margin-bottom: 12px;
}

.page-hero p {
  color: rgba(255,255,255,0.7);
  font-size: 16px;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .mobile-toggle { display: flex; }
  
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
  }
  
  .main-nav.active { display: flex; }
  
  .main-nav a {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  
  .hero-content h1 { font-size: 28px; }
  .hero-bg { width: 100%; opacity: 0.2; }
  .hero-section { padding: 48px 0; }
  
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 24px; }
  
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .hero-btns { justify-content: center; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 24px; }
  .btn-primary, .btn-outline { padding: 12px 24px; font-size: 14px; }
  .search-wrap { max-width: 100%; }
}

/* === 懒加载 === */
img[data-src] {
  opacity: 0;
  transition: opacity 0.5s ease;
}

img[data-src].loaded {
  opacity: 1;
}

/* === 动画 === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}