/* roulang page: index */
:root {
      --primary-deep: #0A0E17;
      --card-bg: #141B25;
      --panel-bg: #1C2433;
      --accent-pink: #E94057;
      --accent-orange: #FF6B35;
      --accent-green: #1DD1A1;
      --text-white: #FFFFFF;
      --text-body: #B0B8C1;
      --text-muted: #6B7280;
      --border-subtle: rgba(255,255,255,0.06);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-dark: 0 4px 12px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 24px rgba(233,64,87,0.25);
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --max-width: 1280px;
      --nav-height: 64px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--primary-deep);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10,14,23,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 1000;
      border-bottom: 1px solid var(--border-subtle);
    }
    .nav-logo {
      font-size: 1.6rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-logo small {
      font-size: 0.75rem;
      font-weight: 400;
      -webkit-text-fill-color: var(--text-muted);
      margin-left: 6px;
      letter-spacing: 0;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-pink);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-pink);
      border-radius: 2px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-orange));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(233,64,87,0.3);
      transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      filter: brightness(1.1);
      box-shadow: 0 8px 20px rgba(233,64,87,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-orange);
      color: var(--accent-orange);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--accent-orange);
      color: #0A0E17;
      border-color: var(--accent-orange);
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--text-white);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* 移动菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10,14,23,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.8rem;
      color: var(--text-white);
      font-weight: 600;
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding-top: calc(var(--nav-height) + 40px);
      min-height: 90vh;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .badge-group {
      display: flex;
      gap: 32px;
    }
    .badge-item {
      text-align: center;
    }
    .badge-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent-green);
      line-height: 1.2;
    }
    .badge-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      width: 100%;
      aspect-ratio: 4/3;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      position: relative;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      bottom: -10px;
      right: -10px;
      width: 120px;
      height: 120px;
      background: radial-gradient(circle, rgba(233,64,87,0.4) 0%, transparent 70%);
      border-radius: 50%;
      z-index: -1;
    }
    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-subtle);
      transition: all 0.25s;
    }
    .highlight-card:hover {
      border-color: var(--accent-pink);
      box-shadow: var(--shadow-glow);
    }
    .highlight-number {
      font-size: 3.2rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-green));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 12px;
    }
    .highlight-card h3 {
      color: var(--text-white);
      font-size: 1.4rem;
      margin-bottom: 8px;
    }
    /* 案例瀑布 */
    .cases-grid {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
      margin-bottom: 24px;
      overflow: hidden;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      color: var(--accent-pink);
      font-size: 0.8rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-content h3 {
      color: var(--text-white);
      font-size: 1.2rem;
      margin-bottom: 6px;
    }
    /* 对比 */
    .compare-wrapper {
      display: flex;
      align-items: stretch;
      gap: 20px;
    }
    .compare-col {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-subtle);
    }
    .compare-col.recommend {
      border-color: var(--accent-pink);
      position: relative;
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-pink);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .vs-divider {
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.4rem;
      color: var(--accent-pink);
      background: rgba(233,64,87,0.1);
      border-radius: 50%;
      width: 60px;
      height: 60px;
      flex-shrink: 0;
      align-self: center;
    }
    .feature-list {
      list-style: none;
      margin-top: 20px;
    }
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check {
      color: var(--accent-green);
      font-weight: bold;
    }
    .cross {
      color: var(--text-muted);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border-subtle);
      transition: background 0.2s;
    }
    .faq-question {
      display: flex;
      align-items: center;
      padding: 20px;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-white);
    }
    .faq-number {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-right: 16px;
      width: 40px;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.open .faq-number {
      transform: rotate(90deg);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-orange));
      text-align: center;
      padding: 80px 20px;
      border-radius: 24px;
      margin: 60px 0;
    }
    .cta-banner h2 {
      color: white;
    }
    .cta-banner .btn-white {
      background: white;
      color: #0A0E17;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      margin-top: 24px;
      display: inline-block;
      transition: 0.2s;
    }
    .cta-banner .btn-white:hover {
      background: #0A0E17;
      color: white;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-subtle);
      padding: 20px 0;
      text-align: center;
      color: var(--text-muted);
    }
    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        gap: 40px;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-grid {
        columns: 2;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: flex;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .cases-grid {
        columns: 1;
      }
      .compare-wrapper {
        flex-direction: column;
      }
      .vs-divider {
        margin: 16px auto;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      h1 {
        font-size: 2.2rem;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .badge-group {
        flex-wrap: wrap;
        gap: 20px;
      }
    }