/* roulang page: index */
:root {
      --deep-blue-dark: #0A0E27;
      --deep-blue-mid: #0F1229;
      --deep-blue-light: #131836;
      --accent-blue-start: #1E6EF0;
      --accent-blue-end: #00C2FF;
      --accent-orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #7A8BA0;
      --button-glow: rgba(30, 110, 240, 0.5);
      --button-glow-hover: rgba(0, 194, 255, 0.8);
      --border-light: rgba(255, 255, 255, 0.12);
      --card-radius: 16px;
      --button-radius: 8px;
      --container-max: 1320px;
      --section-gap: 80px;
      --card-padding: 28px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--deep-blue-dark);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 16px;
    }

    /* 导航栏 - 固定沉浸式 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .main-header.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 26px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--text-primary);
      text-decoration: none;
      background: linear-gradient(135deg, #ffffff 0%, #e0f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      filter: drop-shadow(0 0 8px rgba(30, 110, 240, 0.4));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.75);
      text-decoration: none;
      font-size: 16px;
      font-weight: 500;
      transition: color 0.3s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-blue-end);
      transition: width 0.3s;
    }

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

    .nav-cta {
      background: linear-gradient(135deg, var(--accent-blue-start), var(--accent-blue-end));
      color: #fff;
      border: none;
      padding: 12px 28px;
      border-radius: var(--button-radius);
      font-weight: 600;
      text-decoration: none;
      box-shadow: 0 0 20px var(--button-glow);
      transition: all 0.3s;
    }

    .nav-cta:hover {
      box-shadow: 0 0 32px var(--button-glow-hover);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      background: transparent;
      border: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(20px);
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 999;
      gap: 32px;
      list-style: none;
      font-size: 24px;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      color: white;
      text-decoration: none;
    }

    /* Hero 首屏 */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      background-blend-mode: overlay;
      background-color: rgba(10, 14, 39, 0.55);
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 70% 60%, rgba(30, 110, 240, 0.15) 0%, transparent 70%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    .hero h1 {
      font-size: 64px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #fff;
      text-shadow: 0 0 30px rgba(0,0,0,0.5);
    }

    .hero .subtitle {
      font-size: 20px;
      color: #D3E0F0;
      margin-bottom: 40px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-blue-start), var(--accent-blue-end));
      border: none;
      padding: 16px 36px;
      border-radius: var(--button-radius);
      color: white;
      font-weight: 600;
      font-size: 18px;
      box-shadow: 0 0 24px var(--button-glow);
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 38px var(--button-glow-hover);
      transform: translateY(-3px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.45);
      backdrop-filter: blur(12px);
      color: white;
      padding: 16px 36px;
      border-radius: var(--button-radius);
      font-weight: 500;
      font-size: 18px;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
    }

    .btn-ghost:hover {
      background: rgba(255,255,255,0.08);
      border-color: rgba(255,255,255,0.8);
    }

    .floating-card {
      position: absolute;
      right: 8%;
      bottom: 12%;
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 24px 32px;
      color: white;
      z-index: 3;
    }

    .floating-card .number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: 'Inter', sans-serif;
    }

    /* 通用板块样式 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: None 28px;
      color: white;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 4px;
      background: var(--accent-blue-end);
      border-radius: 2px;
    }

    /* 服务板块 非对称布局 */
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 28px;
      margin-top: 40px;
    }

    .service-large {
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      padding: var(--card-padding);
      backdrop-filter: blur(10px);
      display: flex;
      gap: 24px;
      align-items: center;
    }

    .service-large img {
      width: 45%;
      border-radius: 12px;
      object-fit: cover;
    }

    .service-small-group {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .service-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      padding: 24px;
    }

    /* 数据区 */
    .data-section {
      background: #0F1229;
      background-image: radial-gradient(circle at 30% 40%, rgba(30,110,240,0.1) 0%, transparent 50%);
    }

    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 32px;
    }

    .data-item .big-number {
      font-size: 64px;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: 'Inter', sans-serif;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 400px;
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      padding: 24px;
      backdrop-filter: blur(8px);
      scroll-snap-align: start;
    }

    .case-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      border-radius: 12px;
    }

    /* 时间轴 */
    .timeline {
      display: flex;
      flex-direction: column;
      position: relative;
      margin-top: 48px;
    }

    .timeline-item {
      display: flex;
      gap: 40px;
      margin-bottom: 48px;
    }

    .timeline-marker {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--accent-blue-start), var(--accent-blue-end));
      border-radius: 50%;
      box-shadow: 0 0 18px var(--button-glow);
    }

    /* FAQ 双列 */
    .faq-layout {
      display: flex;
      gap: 48px;
    }

    .faq-categories {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-questions {
      flex:3;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0F1229, #151b3a);
      text-align: center;
      padding: 80px 0;
    }

    footer {
      background: #080B1A;
      padding: 48px 0 24px;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .data-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .case-card {
        min-width: 320px;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 42px; }
      .floating-card { display: none; }
      .faq-layout { flex-direction: column; }
    }