/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-light: #9D4EDD;
      --accent: #00F0FF;
      --accent-soft: #00D4AA;
      --bg: #FAFAFC;
      --bg-dark: #0E0A1F;
      --card-bg: #FFFFFF;
      --card-alt-bg: #F5F3FF;
      --text-heading: #1A1025;
      --text-body: #3A3450;
      --text-muted: #6B6380;
      --text-on-dark: #E0D9FF;
      --border-light: rgba(123, 47, 247, 0.08);
      --border-hover: rgba(123, 47, 247, 0.25);
      --shadow-sm: 0 2px 12px rgba(14, 10, 31, 0.04);
      --shadow-md: 0 8px 30px rgba(14, 10, 31, 0.08);
      --shadow-btn: 0 6px 20px rgba(123, 47, 247, 0.3);
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 50px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250, 250, 252, 0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(14, 10, 31, 0.06);
      transition: background 0.3s;
    }

    .header.scrolled {
      background: rgba(250, 250, 252, 0.98);
      box-shadow: 0 4px 20px rgba(14, 10, 31, 0.06);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      background: linear-gradient(135deg, var(--primary), var(--accent-soft));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
      list-style: none;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      transition: 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(123, 47, 247, 0.06);
      border-bottom: 2px solid var(--accent);
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--accent-soft));
      color: #fff;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-size: 14px;
      box-shadow: 0 4px 14px rgba(123, 47, 247, 0.3);
      transition: 0.3s;
      white-space: nowrap;
    }

    .nav-cta:hover {
      box-shadow: var(--shadow-btn);
      filter: brightness(1.1);
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }

    .burger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(250, 250, 252, 0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 16px;
      display: none;
      z-index: 999;
      overflow-y: auto;
    }

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

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      color: var(--text-heading);
    }

    /* 区块通用 */
    section {
      padding: 120px 0;
    }

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

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(14, 10, 31, 0.75) 0%, rgba(123, 47, 247, 0.5) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: #fff;
      position: relative;
    }

    .hero-content {
      max-width: 700px;
      animation: fadeUp 0.8s ease;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
      color: #fff;
    }

    .hero .decor-line {
      width: 60px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 36px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: #0E0A1F;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      border: none;
      font-size: 16px;
      box-shadow: 0 6px 18px rgba(0, 240, 255, 0.25);
      transition: 0.3s;
    }

    .btn-primary:hover {
      background: #fff;
      color: var(--primary);
      box-shadow: 0 8px 24px rgba(0, 240, 255, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255, 255, 255, 0.7);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 500;
      transition: 0.3s;
    }

    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: #fff;
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 标题短装饰 */
    .section-title {
      font-size: 40px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: 0.3s;
      box-shadow: var(--shadow-sm);
    }

    .advantage-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .icon-placeholder {
      font-size: 32px;
      margin-bottom: 20px;
      color: var(--primary);
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: 0.3s;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

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

    .service-body {
      padding: 24px;
    }

    .stats {
      background: var(--bg-dark);
      color: #fff;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }

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

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .cta-block {
      background: linear-gradient(135deg, var(--primary), var(--accent-soft));
      color: #fff;
      text-align: center;
      border-radius: var(--radius-lg);
    }

    .footer {
      background: var(--bg-dark);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    @media (max-width: 992px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-cta.desktop { display: none; }
      .burger { display: flex; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 32px; }
    }