/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: rgba(123, 47, 247, 0.45);
      --secondary: #F59E0B;
      --secondary-glow: rgba(245, 158, 11, 0.4);
      --bg-deep: #0F0A1A;
      --bg-card: rgba(26, 19, 51, 0.85);
      --bg-card-solid: #1A1333;
      --text-white: #FFFFFF;
      --text-light: #C9C5D4;
      --text-muted: #8A8695;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-active: rgba(123, 47, 247, 0.5);
      --radius-lg: 1.2rem;
      --radius-md: 0.8rem;
      --radius-sm: 0.5rem;
      --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(123, 47, 247, 0.2);
      --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.7), 0 0 0 2px var(--primary-glow);
      --font-sans: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.75;
      margin: 0;
      overflow-x: hidden;
      font-size: 16px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 2.8rem;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    .text-gradient {
      background: linear-gradient(135deg, #C084FC, #7B2FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .accent-text {
      color: var(--secondary);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .navbar {
      background: rgba(15, 10, 26, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      padding: 0.8rem 0;
      transition: background 0.3s;
      z-index: 1000;
    }

    .navbar-brand {
      font-size: 1.6rem;
      font-weight: 700;
      background: linear-gradient(135deg, #C084FC, #7B2FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }

    .nav-link {
      color: var(--text-light) !important;
      margin: 0 0.8rem;
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding-bottom: 4px;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--secondary) !important;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--secondary);
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-md);
      transition: var(--transition);
      box-shadow: 0 0 12px var(--primary-glow);
    }

    .btn-primary-custom:hover {
      background: #8B3FFF;
      box-shadow: 0 0 20px var(--primary-glow);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline-gold {
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
      font-weight: 600;
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }

    .btn-outline-gold:hover {
      background: var(--secondary);
      color: #0F0A1A;
      box-shadow: 0 0 18px var(--secondary-glow);
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(123, 47, 247, 0.25), transparent 70%),
                  radial-gradient(circle at 80% 60%, rgba(245, 158, 11, 0.12), transparent 60%),
                  var(--bg-deep);
      position: relative;
      overflow: hidden;
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 1.5rem;
    }

    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 320px;
      width: 100%;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      border: 1px solid rgba(123, 47, 247, 0.4);
    }

    /* 卡片通用 */
    .card-custom {
      background: var(--bg-card);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      transition: var(--transition);
      height: 100%;
    }

    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--border-active);
    }

    .service-card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--secondary);
      text-shadow: 0 0 14px rgba(245,158,11,0.4);
    }

    .divider-vertical {
      width: 1px;
      height: 60px;
      background: rgba(255,255,255,0.15);
    }

    .case-image {
      background-size: cover;
      background-position: center;
      min-height: 240px;
      border-radius: var(--radius-md);
    }

    .faq-button {
      background: transparent;
      border: none;
      color: var(--text-white);
      font-weight: 600;
      text-align: left;
      width: 100%;
      padding: 1.2rem 0;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-button:hover {
      color: var(--secondary);
    }

    .cta-section {
      background: linear-gradient(135deg, #3A1C6E, #0F0A1A);
      border-radius: var(--radius-lg);
    }

    footer {
      background: #0A0614;
      border-top: 1px solid var(--border-subtle);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2.5rem;
      }
      .hero-title {
        font-size: 2.6rem;
      }
      .navbar-collapse {
        background: rgba(15,10,26,0.98);
        padding: 1.5rem;
        border-radius: var(--radius-md);
      }
      .data-number {
        font-size: 2.2rem;
      }
    }