/* roulang page: index */
:root {
      --primary-orange: #FF4C00;
      --primary-orange-light: #FF6B35;
      --accent-cyan: #00E5FF;
      --deep-blue: #0A0F1F;
      --deep-blue2: #16203A;
      --glass-bg: rgba(10, 15, 31, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-tertiary: rgba(255, 255, 255, 0.4);
      --card-radius: 24px;
      --btn-radius: 50px;
      --container-max: 1320px;
      --section-padding: 120px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 链接全局 */
    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color 0.3s;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(10px);
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, border-bottom 0.3s;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(10, 15, 31, 0.8);
      backdrop-filter: blur(30px);
      border-bottom: 1px solid var(--accent-cyan);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 26px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary-orange), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

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

    .nav-links a {
      color: var(--text-primary);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      display: block;
      transition: 0.3s;
    }

    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10, 15, 31, 0.95);
        backdrop-filter: blur(40px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transition: right 0.4s ease;
        border-left: 1px solid var(--glass-border);
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }

    /* 板块通用 */
    section {
      padding: var(--section-padding) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10, 15, 31, 0.65);
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 50%, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 900;
      letter-spacing: 2px;
      background: linear-gradient(to right, var(--primary-orange), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }

    .hero .subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-orange), var(--primary-orange-light));
      border: none;
      color: white;
      padding: 16px 40px;
      border-radius: var(--btn-radius);
      font-weight: 700;
      font-size: 16px;
      letter-spacing: 1px;
      box-shadow: 0 0 30px rgba(255, 76, 0, 0.4);
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(255, 76, 0, 0.7);
      transform: scale(1.05);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0, 229, 255, 0.5);
      color: var(--accent-cyan);
      padding: 16px 40px;
      border-radius: var(--btn-radius);
      font-weight: 700;
      font-size: 16px;
      letter-spacing: 1px;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-ghost:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: var(--accent-cyan);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
    }

    /* 板块标题 */
    .section-title {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 48px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .section-title::before {
      content: '';
      width: 4px;
      height: 40px;
      background: var(--accent-cyan);
      border-radius: 4px;
      display: inline-block;
    }

    /* 核心服务 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 30px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 40px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      transition: 0.4s cubic-bezier(0.2, 0.9, 0.4, 1);
    }

    .service-card.large {
      grid-row: span 1;
    }

    .service-card:nth-child(2),
    .service-card:nth-child(3) {
      transform: translateY(-20px);
    }

    .service-card:hover {
      border-color: rgba(0, 229, 255, 0.6);
      box-shadow: 0 20px 50px rgba(0, 229, 255, 0.15);
      transform: translateY(-8px);
    }

    .card-icon {
      font-size: 36px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .service-card p {
      color: var(--text-secondary);
      margin-bottom: 24px;
    }

    .card-link {
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-card.large {
        grid-column: span 2;
      }
      .service-card:nth-child(2),
      .service-card:nth-child(3) {
        transform: none;
      }
    }

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card.large {
        grid-column: span 1;
      }
    }

    /* 数据优势区 */
    .stats-section {
      background: var(--deep-blue2);
      position: relative;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 40px;
    }

    .stat-item {
      flex: 1;
      min-width: 180px;
    }

    .stat-number {
      font-size: 52px;
      font-weight: 900;
      color: var(--primary-orange);
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 案例卡片横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
      -webkit-overflow-scrolling: touch;
    }

    .case-card {
      min-width: 380px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      overflow: hidden;
      transition: 0.4s;
      flex-shrink: 0;
    }

    .case-card:hover {
      transform: translateY(-10px);
      border-color: var(--accent-cyan);
      box-shadow: 0 20px 40px rgba(0,229,255,0.2);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-content {
      padding: 28px;
    }

    .case-tag {
      background: rgba(0,229,255,0.15);
      color: var(--accent-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 14px;
    }

    .case-title {
      font-size: 22px;
      margin: 16px 0 8px;
    }

    @media (max-width: 768px) {
      .case-card {
        min-width: 280px;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      margin-bottom: 16px;
      border-radius: 12px;
      overflow: hidden;
      transition: 0.3s;
    }

    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: none;
      border: none;
      color: white;
      width: 100%;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }

    .faq-item.active {
      border-left: 4px solid var(--primary-orange);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #0A0F1F, #0A1228);
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .cta-text h2 {
      font-size: 38px;
      margin-bottom: 24px;
    }

    .form-group {
      margin-bottom: 24px;
    }

    .form-input {
      width: 100%;
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      padding: 16px 8px;
      color: white;
      font-size: 16px;
      transition: 0.3s;
    }

    .form-input:focus {
      outline: none;
      border-bottom-color: var(--accent-cyan);
      box-shadow: 0 4px 12px rgba(0,229,255,0.2);
    }

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

    /* 页脚 */
    .site-footer {
      text-align: center;
      padding: 40px 0;
      background: #060B16;
      color: var(--text-tertiary);
    }