/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --accent-gold: #E7B42C;
      --cyber-cyan: #00E5FF;
      --bg-light: #F5F6FA;
      --deep-bg: #060B1A;
      --card-white: #FFFFFF;
      --text-main: #1F2A3A;
      --text-muted: #5B677B;
      --border-light: #E9ECF2;
      --shadow-sm: 0 4px 24px rgba(10,14,39,0.06);
      --shadow-hover: 0 12px 40px rgba(10,14,39,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --container-max: 1200px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3 {
      font-family: 'Montserrat', 'Noto Sans SC', sans-serif;
      font-weight: 700;
    }

    h1 {
      font-size: 56px;
      line-height: 1.1;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 40px;
      line-height: 1.2;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.3;
    }

    p {
      color: var(--text-muted);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      outline: none;
    }

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

    .navbar.scrolled {
      background: var(--card-white);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }

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

    .logo {
      font-family: 'Montserrat', 'Noto Sans SC', sans-serif;
      font-weight: 800;
      font-size: 1.8rem;
      color: #fff;
      letter-spacing: -0.5px;
      transition: color 0.3s;
    }
    .navbar.scrolled .logo {
      color: var(--primary-dark);
    }
    .logo span {
      color: var(--accent-gold);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      font-size: 0.95rem;
    }
    .navbar.scrolled .nav-links a {
      color: var(--text-main);
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }

    .btn-primary {
      background: var(--accent-gold);
      color: #0A0E27;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: #c98f1c;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(231,180,44,0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: #fff;
      transition: 0.3s;
    }
    .navbar.scrolled .hamburger span {
      background: var(--primary-dark);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background: radial-gradient(circle at 30% 40%, #1a1f3a, var(--deep-bg));
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      color: #fff;
    }
    .hero-left h1 {
      color: #fff;
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
      max-width: 450px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.7);
      color: #fff;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
    }
    .btn-ghost:hover {
      background: #fff;
      color: var(--primary-dark);
    }
    .hero-stats {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: left;
    }
    .stat-number {
      font-family: 'DIN Alternate', 'Montserrat', sans-serif;
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent-gold);
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-image {
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 25px;
      left: 50%;
      transform: translateX(-50%);
      color: #fff;
      font-size: 1.8rem;
      animation: bounce 2s infinite;
      z-index: 3;
    }

    @keyframes bounce {
      0%,100%{ transform: translateX(-50%) translateY(0); }
      50%{ transform: translateX(-50%) translateY(6px); }
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--cyber-cyan);
      margin-bottom: 20px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }
    .tag {
      background: #f0f2f5;
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.75rem;
    }

    /* 数据徽章 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .stat-badge .count {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 340px;
      background: #11162b;
      border-radius: var(--radius-lg);
      overflow: hidden;
      scroll-snap-align: start;
      color: #fff;
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-reverse {
      flex-direction: row-reverse;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    /* CTA */
    .cta-section {
      background: var(--deep-bg);
      color: #fff;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
    }

    footer {
      background: #0A0E27;
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 992px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero .container { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 38px; }
      .services-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }