/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #E6332A;
      --primary-dark: #b51e17;
      --secondary-bg: #1A1A2E;
      --accent-gold: #FFB800;
      --text-primary: #F5F5F5;
      --text-secondary: #E0E0E0;
      --text-muted: #A0A0B0;
      --border-light: rgba(230, 51, 42, 0.25);
      --border-gold: rgba(255, 184, 0, 0.6);
      --card-bg: rgba(20, 20, 35, 0.75);
      --card-hover-shadow: 0 8px 32px rgba(230, 51, 42, 0.35);
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.5);
      --font-mono: 'Roboto Mono', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: #0D0D1A;
      color: var(--text-secondary);
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 背景速度线纹理 */
    .bg-speed-lines {
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400" opacity="0.08"><path d="M20 80 L380 20 M5 180 L395 140 M30 280 L370 260 M15 380 L385 360" stroke="%23ffffff" stroke-width="1.5" fill="none"/></svg>');
      background-size: cover;
    }
    .bg-grid {
      background-image: linear-gradient(rgba(230,51,42,0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(230,51,42,0.08) 1px, transparent 1px);
      background-size: 32px 32px;
    }
    /* 导航 */
    .navbar {
      background-color: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
    }
    .nav-link {
      color: #F0F0F0;
      transition: color 0.3s, border-bottom 0.3s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .mobile-menu {
        display: block;
      }
      .desktop-nav-links {
        display: none;
      }
      .mobile-nav-open .desktop-nav-links {
        display: flex;
        flex-direction: column;
        background: var(--secondary-bg);
        position: absolute;
        top: 65px;
        left: 0;
        width: 100%;
        padding: 16px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-light);
      }
    }
    /* 卡片悬停 */
    .feature-card {
      background: var(--card-bg);
      border: 1px solid rgba(230, 51, 42, 0.2);
      border-radius: var(--radius-lg);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--accent-gold);
    }
    .middle-card {
      border-color: var(--accent-gold);
      box-shadow: 0 0 20px rgba(255,184,0,0.4);
      transform: translateY(-16px);
    }
    .middle-card:hover {
      transform: translateY(-20px);
    }
    @media (max-width: 768px) {
      .middle-card {
        transform: none;
      }
      .middle-card:hover {
        transform: translateY(-6px);
      }
    }
    .case-card img {
      transition: transform 0.4s ease;
    }
    .case-card:hover img {
      transform: scale(1.04);
    }
    .glow-button {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border-radius: 40px;
      padding: 12px 28px;
      transition: all 0.3s;
      box-shadow: 0 0 12px rgba(230,51,42,0.5);
      border: none;
      cursor: pointer;
    }
    .glow-button:hover {
      background: #ff3b34;
      box-shadow: 0 0 24px rgba(230,51,42,0.9);
      transform: scale(1.02);
    }
    .outline-button {
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      background: transparent;
      font-weight: 600;
      border-radius: 40px;
      padding: 12px 28px;
      transition: all 0.3s;
      cursor: pointer;
    }
    .outline-button:hover {
      background: var(--accent-gold);
      color: #0D0D1A;
    }
    .faq-item {
      border-bottom: 1px solid rgba(230,51,42,0.2);
      padding: 18px 0;
      cursor: pointer;
      transition: background 0.3s;
    }
    .faq-item.active .faq-content {
      max-height: 300px;
      opacity: 1;
      padding-top: 12px;
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      opacity: 0;
      transition: max-height 0.4s ease, opacity 0.3s;
      background: rgba(255,255,255,0.03);
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
    }
    .faq-item i {
      transition: transform 0.3s;
    }
    .faq-item.active i {
      transform: rotate(45deg);
    }
    .form-input {
      background: #1E1E32;
      border: 1px solid #3A3A50;
      border-radius: 8px;
      padding: 12px 16px;
      color: white;
      width: 100%;
      transition: border 0.3s, box-shadow 0.3s;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 8px rgba(230,51,42,0.6);
    }