/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-cyan: #00F0FF;
      --gold: #FFD700;
      --bg-dark: #0A0E27;
      --bg-deep: #0F1330;
      --white: #FFFFFF;
      --text-soft: rgba(255, 255, 255, 0.7);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(255, 255, 255, 0.2);
      --card-bg: rgba(255, 255, 255, 0.04);
      --shadow-glow: 0 20px 40px rgba(123, 47, 247, 0.15);
      --radius-card: 20px;
      --radius-btn: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "SF Pro Display", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--white);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-soft);
      position: relative;
      padding: 8px 0;
      font-size: 1rem;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary-purple), var(--primary-cyan));
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.98);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: white;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(123, 47, 247, 0.25) 0%, transparent 60%), 
                  radial-gradient(circle at 80% 70%, rgba(0, 240, 255, 0.15) 0%, transparent 50%);
      padding-top: 80px;
    }
    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #e0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 32px;
    }
    .badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }
    .badge {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-light);
      border-radius: 40px;
      padding: 8px 20px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--gold);
      font-size: 0.9rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: 0 8px 24px rgba(123,47,247,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 32px rgba(0,240,255,0.5);
    }
    .btn-outline {
      border: 1px solid rgba(255,255,255,0.6);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      background: transparent;
      margin-left: 16px;
    }
    .btn-outline:hover {
      background: white;
      color: var(--bg-dark);
      border-color: white;
    }
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      min-height: 400px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 1px solid rgba(255,255,255,0.1);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .section-sub {
      color: var(--text-soft);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 64px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition);
    }
    .card:hover {
      border-color: var(--border-hover);
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
    }
    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      border-radius: 16px;
      margin-bottom: 24px;
    }
    .card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 16px 16px 0 0;
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scenario-card {
      background: rgba(15,19,48,0.7);
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .stats-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin: 48px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--gold);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-soft);
      padding-left: 32px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    footer {
      background: #060916;
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .grid-3, .service-grid, .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-content {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .service-grid, .scenario-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 { font-size: 32px; }
      .section-title { font-size: 28px; }
    }