/* roulang page: index */
:root {
      --primary: #E10600;
      --primary-dark: #b30500;
      --secondary: #1A1A2E;
      --bg-deep: #0D0D1A;
      --accent: #00F0FF;
      --neutral-light: #F5F5F7;
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 240, 255, 0.5);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-xl: 30px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(0, 240, 255, 0.15);
      --transition: all 0.3s ease;
      --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', '黑体', system-ui, sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', '黑体', system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 基础排版 */
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
    }

    h1 { font-size: clamp(3rem, 8vw, 4rem); }
    h2 { font-size: clamp(2rem, 5vw, 2.5rem); }
    h3 { font-size: 1.5rem; }
    p { margin-bottom: 1.5rem; color: var(--text-secondary); }

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

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

    button {
      font-family: var(--font-body);
      cursor: pointer;
      border: none;
      outline: none;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(13, 13, 26, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 12px 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--text-primary);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }

    .nav-chips {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-chip {
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.25);
      background: transparent;
      color: var(--text-secondary);
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--accent);
      color: var(--bg-deep);
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-xl);
      font-weight: 700;
      font-size: 0.95rem;
      letter-spacing: 1px;
      transition: var(--transition);
      border: none;
      box-shadow: 0 4px 15px rgba(225,6,0,0.4);
    }
    .btn-primary:hover {
      background: #ff2a22;
      box-shadow: 0 6px 24px rgba(225,6,0,0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 10px 28px;
      border-radius: var(--radius-xl);
      font-weight: 700;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent);
      color: var(--bg-deep);
      box-shadow: 0 0 25px rgba(0,240,255,0.6);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(13,13,26,0.95);
      backdrop-filter: blur(20px);
      border-top: 1px solid var(--border-light);
      padding: 8px 16px;
      z-index: 999;
      justify-content: space-around;
    }

    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      .site-header .btn-primary { display: none; }
      .header-inner { justify-content: center; }
    }

    /* 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;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: linear-gradient(90deg, rgba(13,13,26,0.85) 0%, rgba(13,13,26,0.4) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 1.2rem;
      text-shadow: 0 0 30px rgba(225,6,0,0.6);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 420px;
      filter: drop-shadow(0 0 40px rgba(0,240,255,0.3));
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-visual img {
        max-height: 260px;
      }
      .hero-text h1 {
        font-size: 2.6rem;
      }
    }

    /* 通用区块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      margin-bottom: 3rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-title h2 {
      color: white;
    }
    .section-title span {
      color: var(--accent);
    }

    /* 核心优势 不对称栅格 */
    .grid-asym {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: rgba(26,26,46,0.7);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition);
    }
    .adv-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }
    .adv-card h3 {
      font-size: 1.6rem;
      margin-bottom: 0.8rem;
    }

    @media (max-width: 768px) {
      .grid-asym {
        grid-template-columns: 1fr;
      }
    }

    /* 服务 Tab */
    .tab-chips {
      display: flex;
      gap: 12px;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }
    .tab-chip {
      padding: 10px 24px;
      border-radius: 24px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.2);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      color: var(--text-secondary);
    }
    .tab-chip.active {
      background: var(--accent);
      color: #0D0D1A;
      border-color: var(--accent);
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: rgba(26,26,46,0.6);
      border-radius: var(--radius-md);
      overflow: hidden;
      border:1px solid var(--border-light);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-5px);
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }
    .service-card img {
      height: 180px;
      object-fit: cover;
    }
    .service-info {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .service-grid { grid-template-columns: 1fr; }
    }

    /* 数据计数器 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent);
      font-family: 'Inter', monospace;
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 案例横向滚动 */
    .scroll-x {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: rgba(26,26,46,0.7);
      border-radius: var(--radius-md);
      overflow: hidden;
      border:1px solid var(--border-light);
    }
    .case-card img {
      height: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 16px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }
    .faq-question {
      background: rgba(255,255,255,0.03);
      padding: 18px 20px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .faq-answer {
      padding: 0 20px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer { display: block; }
    .faq-item.open .faq-question { color: var(--accent); }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #E10600 0%, #1A1A2E 100%);
      padding: 80px 24px;
      text-align: center;
      border-radius: 0;
    }
    .pulse {
      animation: pulse 1.8s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(225,6,0,0.5); }
      70% { box-shadow: 0 0 0 18px rgba(225,6,0,0); }
      100% { box-shadow: 0 0 0 0 rgba(225,6,0,0); }
    }

    /* 页脚 */
    .footer {
      background: #0A0A14;
      padding: 48px 0 24px;
      border-top: 1px solid var(--border-light);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }