/* ============================================
   国产 - 原创样式表
   品牌：国产 | 域名：yaylnl.cn
   配色：深紫黑+樱粉+赛博蓝+暖橙
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --primary: #1A0B2E;
  --secondary: #FF6B9D;
  --accent: #00D4FF;
  --warm: #FFB347;
  --bg-dark: #0F0A1A;
  --bg-card: #1E1333;
  --text-light: #E8E0F0;
  --text-muted: #9B8FB8;
  --border-glow: rgba(0, 212, 255, 0.3);
  --shadow-purple: rgba(26, 11, 46, 0.6);
  --gradient-main: linear-gradient(135deg, #FF6B9D 0%, #00D4FF 100%);
  --gradient-warm: linear-gradient(135deg, #FFB347 0%, #FF6B9D 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --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: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

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

/* === 顶部导航 === */
.site-header {
  background: rgba(15, 10, 26, 0.95);
  backdrop-filter: blur(20px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-glow);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 42px;
  width: auto;
}

.logo-text {
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  color: var(--text-light);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  background: rgba(255, 107, 157, 0.15);
  color: var(--secondary);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* === 搜索栏 === */
.search-bar {
  background: var(--primary);
  padding: 14px 0;
  margin-top: 66px;
  border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.search-wrapper {
  display: flex;
  align-items: center;
  max-width: 680px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: 50px;
  border: 1px solid var(--border-glow);
  overflow: hidden;
  transition: var(--transition);
}

.search-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

.search-wrapper input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-light);
  padding: 12px 24px;
  font-size: 0.95rem;
  outline: none;
}

.search-wrapper input::placeholder {
  color: var(--text-muted);
}

.search-wrapper button {
  background: var(--gradient-main);
  border: none;
  color: #fff;
  padding: 12px 28px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.search-wrapper button:hover {
  opacity: 0.85;
}

/* === 面包屑 === */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

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

.breadcrumb span {
  margin: 0 8px;
  color: var(--text-muted);
}

/* === Hero 横幅 === */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.55);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 60px 20px;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 18px;
  line-height: 1.3;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.hero-content h1 .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 1.15rem;
  color: rgba(232, 224, 240, 0.85);
  max-width: 640px;
  margin: 0 auto 30px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

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

/* === 按钮 === */
.btn-primary {
  display: inline-block;
  background: var(--gradient-main);
  color: #fff;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 107, 157, 0.4);
  color: #fff;
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--accent);
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid var(--accent);
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--primary);
  transform: translateY(-2px);
}

/* === 通用区块 === */
.section {
  padding: 70px 0;
}

.section-alt {
  background: var(--primary);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title h2 .accent {
  color: var(--secondary);
}

.section-title p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

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

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 107, 157, 0.1);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--secondary);
  box-shadow: 0 12px 40px rgba(255, 107, 157, 0.15);
}

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

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

.video-card:hover .video-thumb img {
  transform: scale(1.08);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 64px;
  height: 64px;
  background: rgba(255, 107, 157, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 3;
}

.play-btn::after {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 12px 0 12px 22px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.video-card:hover .play-btn {
  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: 0.8rem;
  z-index: 3;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.video-meta .tag {
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
}

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

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.1);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--gradient-main);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

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

.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(255, 107, 157, 0.1);
  transition: var(--transition);
}

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

.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--secondary);
}

.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.expert-card h4 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.expert-card .role {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.expert-card .desc {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-bottom: 14px;
}

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

.expert-btns a {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  transition: var(--transition);
}

.expert-btns a:hover {
  background: var(--accent);
  color: var(--primary);
}

/* === 合作品牌 === */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  align-items: center;
}

.partner-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px 32px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
}

.partner-item:hover {
  border-color: var(--warm);
  color: var(--warm);
}

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

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
}

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

.faq-question .arrow {
  transition: transform 0.3s ease;
  font-size: 1.2rem;
  color: var(--accent);
}

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

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

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 24px 18px;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* === 用户评论 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(255, 179, 71, 0.15);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
}

.review-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.review-stars {
  color: var(--warm);
  font-size: 0.9rem;
  letter-spacing: 2px;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  font-style: italic;
}

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  align-items: start;
}

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

.contact-info-list li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(0, 212, 255, 0.1);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.contact-info-list .label {
  color: var(--accent);
  font-weight: 600;
  min-width: 80px;
}

.contact-qr-group {
  display: flex;
  gap: 24px;
  justify-content: center;
}

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

.qr-item img {
  width: 160px;
  height: 160px;
  border-radius: var(--radius);
  border: 2px solid var(--border-glow);
  margin-bottom: 8px;
}

.qr-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* === 页脚 === */
.site-footer {
  background: var(--primary);
  border-top: 1px solid var(--border-glow);
  padding: 40px 0 20px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 30px;
}

.footer-brand .logo-text {
  font-size: 1.3rem;
  margin-bottom: 12px;
  display: block;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-light);
}

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

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--secondary);
}

.footer-bottom {
  border-top: 1px solid rgba(0, 212, 255, 0.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.85rem;
  border: 1px solid rgba(0, 212, 255, 0.1);
  transition: var(--transition);
}

.social-links a:hover {
  background: var(--secondary);
  color: #fff;
  border-color: var(--secondary);
}

/* === 内页横幅 === */
.page-banner {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 66px;
  overflow: hidden;
}

.page-banner .banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
}

.page-banner .banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 40px 20px;
}

.page-banner h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-banner p {
  color: rgba(232, 224, 240, 0.8);
  font-size: 1.05rem;
}

/* === 内页内容区 === */
.page-content {
  padding: 50px 0;
}

.content-block {
  margin-bottom: 50px;
}

.content-block h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 16px;
  border-left: 4px solid var(--secondary);
}

.content-block h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--accent);
}

.content-block p {
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.8;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag-list .tag {
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

/* === 图文指南 === */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.guide-step {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(255, 179, 71, 0.15);
}

.step-number {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: var(--gradient-warm);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
}

.guide-step h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.guide-step p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* === 分享按钮 === */
.share-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 16px 0;
}

.share-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  color: #fff;
}

.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #161823; border: 1px solid #444; }
.share-btn.bilibili { background: #00A1D6; }

.share-btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

/* === 懒加载 === */
.lazy-img {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.lazy-img.loaded {
  opacity: 1;
}

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

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: rgba(15, 10, 26, 0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-glow);
  }

  .main-nav.open {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .hero-content h1 {
    font-size: 1.8rem;
  }

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

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

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

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

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

  .guide-steps {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .page-banner {
    min-height: 220px;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  .section {
    padding: 40px 0;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }
}

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

  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary, .btn-outline {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }

  .contact-qr-group {
    flex-direction: column;
    align-items: center;
  }
}

/* === 最新动态滚动条 === */
.news-ticker {
  padding: 0;
}

.news-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 12px 20px;
  border: 1px solid rgba(255, 107, 157, 0.15);
  overflow: hidden;
}

.news-label {
  background: var(--gradient-main);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.news-scroll {
  display: flex;
  gap: 60px;
  animation: newsScroll 30s linear infinite;
  white-space: nowrap;
}

.news-scroll span {
  color: var(--text-muted);
  font-size: 0.88rem;
  flex-shrink: 0;
}

@keyframes newsScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* === 编辑/作者署名 === */
.section-author {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-bottom: 8px;
}

/* === 评论日期 === */
.review-date {
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 8px;
  text-align: right;
}

/* === 专家网格5列 === */
@media (min-width: 1025px) {
  .expert-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}