/* roulang page: index */
:root {
      --primary-bg: #0A0E17;
      --card-bg: #141B25;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3A6F;
      --text-main: #E8ECF1;
      --text-muted: #8A919C;
      --border-color: #1F2833;
      --gradient-btn: linear-gradient(135deg, #00F0FF 0%, #0088CC 100%);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 40px rgba(0,240,255,0.15);
      --radius-card: 12px;
      --radius-btn: 6px;
      --font-sans: "Inter", "SF Pro Display", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --spacing-section: 120px;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

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

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color 0.3s ease;
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h2 {
      font-size: 2.5rem;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
      color: #fff;
    }

    .section {
      padding: var(--spacing-section) 0;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(31, 40, 51, 0.5);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      text-decoration: none;
      line-height: 1.2;
    }

    .desktop-nav {
      display: flex;
      gap: 2.5rem;
    }

    .desktop-nav a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.3s;
      position: relative;
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--accent-cyan);
    }

    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }

    .desktop-nav a:hover::after,
    .desktop-nav a.active::after {
      width: 100%;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: #0A0E17;
      border-top: 1px solid var(--border-color);
      z-index: 99;
      justify-content: space-around;
      align-items: center;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      font-size: 10px;
      transition: color 0.2s;
      text-decoration: none;
    }

    .mobile-bottom-nav a i {
      font-size: 22px;
      margin-bottom: 2px;
    }

    .mobile-bottom-nav a.active {
      color: var(--accent-cyan);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--gradient-btn);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      text-align: center;
      transition: all 0.3s ease;
      border: none;
      box-shadow: 0 4px 15px rgba(0,240,255,0.3);
      text-decoration: none;
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #00F0FF 20%, #0088CC 100%);
      box-shadow: 0 0 25px rgba(0,240,255,0.6);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      color: var(--accent-cyan);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(90deg, rgba(10,14,23,0.92) 0%, rgba(10,14,23,0.6) 70%);
      z-index: 1;
    }

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

    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      letter-spacing: -0.03em;
    }

    .hero p {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }

    /* 非对称卡片 */
    .asymmetric-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .feature-main-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 2.5rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .feature-main-card:hover {
      box-shadow: var(--shadow-glow);
      border-color: var(--accent-cyan);
    }

    .feature-small-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .feature-small-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }

    .feature-small-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-glow);
    }

    .icon-cyan {
      color: var(--accent-cyan);
      font-size: 2.5rem;
      margin-bottom: 1.2rem;
    }

    /* 图文区块 */
    .alt-block {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .alt-block.reverse {
      flex-direction: row-reverse;
    }

    .alt-text {
      flex: 1;
    }

    .alt-image {
      flex: 1;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }

    .number-badge {
      color: var(--accent-pink);
      font-weight: 700;
      font-size: 1.2rem;
      letter-spacing: 1px;
    }

    .feature-list {
      list-style: none;
      margin-top: 1.5rem;
    }
    .feature-list li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      color: var(--text-muted);
    }
    .feature-list li::before {
      content: '◆';
      color: var(--accent-cyan);
      margin-right: 12px;
      font-size: 0.8rem;
    }

    /* 横向滚动 */
    .scroll-container {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .scroll-container::-webkit-scrollbar { display: none; }
    .scene-card {
      min-width: 280px;
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      scroll-snap-align: start;
      transition: 0.3s;
    }
    .scene-card:hover { border-color: var(--accent-cyan); }

    /* 数据条 */
    .stats-bar {
      background: #141B25;
      display: flex;
      justify-content: space-around;
      text-align: center;
      padding: 50px 20px;
      border-radius: 12px;
      margin: 60px 0;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-pink);
    }

    /* 案例斜切 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 2rem;
    }
    .testimonial-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      padding: 2rem;
      border-radius: 12px;
      clip-path: polygon(0 0, 100% 0, 100% 85%, 88% 100%, 0 100%);
      transition: 0.3s;
    }
    .testimonial-card:hover { border-color: var(--accent-cyan); }

    /* 定价 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pricing-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 2.5rem 2rem;
      flex: 1;
      min-width: 260px;
      transition: 0.3s;
    }
    .pricing-card.featured {
      border-left: 4px solid var(--accent-pink);
      background: #1a2230;
      transform: translateY(-8px);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-color);
      padding: 18px 0;
    }
    .accordion-title {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* CTA */
    .cta-banner {
      background: #141B25;
      background-image: radial-gradient(circle at 30% 30%, rgba(0,240,255,0.08), transparent);
      text-align: center;
      padding: 80px 20px;
      border-radius: 20px;
    }

    .footer {
      background: #0A0E17;
      padding: 60px 0 30px;
      border-top: 1px solid #1F2833;
    }

    @media (max-width: 1024px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      .container { padding: 0 24px; }
      .asymmetric-grid { grid-template-columns: 1fr; }
      .alt-block, .alt-block.reverse { flex-direction: column; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.8rem; }
    }

    @media (max-width: 640px) {
      .section { padding: 60px 0; }
      .hero h1 { font-size: 2.2rem; }
    }