/* roulang page: index */
:root {
      --primary: #FF6B00;
      --primary-hover: #E05E00;
      --primary-glow: rgba(255, 107, 0, 0.25);
      --bg-dark: #0A0D14;
      --bg-card: #121722;
      --bg-card-alt: #181F2E;
      --bg-surface: #0E121A;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-highlight: rgba(255, 107, 0, 0.35);
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
      --shadow-hover: 0 20px 40px -15px rgba(255, 107, 0, 0.3);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-dark);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-dark);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 头部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 13, 20, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      height: 74px;
      display: flex;
      align-items: center;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.4rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

    .brand-logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), #FF8800);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: #fff;
    }

    .nav-list {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--text-main);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: var(--radius-full);
    }

    .btn-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--primary), #FF8533);
      color: #FFF;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px var(--primary-glow);
      transition: var(--transition);
    }

    .btn-cta:hover {
      background: linear-gradient(135deg, var(--primary-hover), var(--primary));
      transform: translateY(-2px);
      box-shadow: 0 6px 20px var(--primary-glow);
    }

    /* 通用板块布局 */
    .section-block {
      padding: 90px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
      max-width: 800px;
    }

    /* 首屏：Before / After 对比 */
    .hero-section {
      padding: 80px 0 100px;
      background: radial-gradient(circle at 50% 10%, rgba(255, 107, 0, 0.12) 0%, transparent 60%);
      overflow: hidden;
    }

    .hero-meta {
      text-align: center;
      max-width: 880px;
      margin: 0 auto 50px;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(255, 107, 0, 0.15);
      border: 1px solid var(--border-highlight);
      border-radius: var(--radius-full);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .hero-intro {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 60px;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: rgba(255, 255, 255, 0.2);
    }

    /* Before / After 并置网格 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: stretch;
    }

    .compare-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      position: relative;
    }

    .compare-card.after {
      border-color: var(--border-highlight);
      box-shadow: 0 0 30px rgba(255, 107, 0, 0.1);
    }

    .compare-tag {
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 16px;
    }

    .compare-card.before .compare-tag {
      background: rgba(255, 255, 255, 0.1);
      color: var(--text-muted);
    }

    .compare-card.after .compare-tag {
      background: var(--primary);
      color: #fff;
    }

    .compare-head {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-top: 20px;
    }

    .compare-item {
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: flex-start;
      gap: 10px;
      line-height: 1.5;
    }

    /* 网格与列表通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .card-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card-item:hover {
      transform: translateY(-5px);
      border-color: var(--border-highlight);
      box-shadow: var(--shadow-card);
    }

    .card-cover {
      width: 100%;
      height: 190px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 20px;
      position: relative;
    }

    .card-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

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

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 横向轨道 / 目录 */
    .track-row {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) transparent;
    }

    .track-card {
      flex: 0 0 280px;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 20px;
      transition: var(--transition);
    }

    .track-card:hover {
      border-color: var(--primary);
    }

    /* 资讯横排列表 */
    .news-article-row {
      display: flex;
      gap: 24px;
      align-items: center;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-bottom: 16px;
      transition: var(--transition);
    }

    .news-article-row:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .news-img {
      width: 160px;
      height: 100px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      flex-shrink: 0;
    }

    .news-content {
      flex: 1;
    }

    .news-meta {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 6px;
    }

    /* 口碑气泡与评价 */
    .testimonial-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 20px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-card-alt);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #06080D;
      border-top: 1px solid var(--border-color);
      padding: 70px 0 40px;
      font-size: 0.9rem;
      color: var(--text-dim);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-brand-desc {
      margin-top: 16px;
      max-width: 320px;
      line-height: 1.7;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .comparison-grid { grid-template-columns: 1fr; }
      .grid-2 { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: 1fr; }
      .hero-title { font-size: 2.2rem; }
      .news-article-row { flex-direction: column; align-items: flex-start; }
      .news-img { width: 100%; height: 160px; }
      .footer-grid { grid-template-columns: 1fr; }
    }