/* roulang page: index */
:root {
      --deep-indigo: #0B1A3B;
      --electric-purple: #7B2FBE;
      --deep-purple: #5E2396;
      --starlight-silver: #C0C8E0;
      --bg-light: #F7F8FC;
      --white: #FFFFFF;
      --text-gray: #5A6070;
      --text-dark: #1E2A3A;
      --border-light: #E2E6EF;
      --shadow-card: 0 4px 20px rgba(11, 26, 59, 0.06);
      --shadow-hover: 0 8px 30px rgba(11, 26, 59, 0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --radius-xl: 16px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep-indigo);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 顶部信息条 */
    .top-bar {
      background-color: var(--deep-indigo);
      color: var(--starlight-silver);
      font-size: 0.85rem;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      letter-spacing: 0.3px;
    }
    .top-bar .domain-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .top-bar .cta-top {
      color: var(--starlight-silver);
      border: 1px solid var(--starlight-silver);
      padding: 2px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      transition: all 0.3s;
      background: transparent;
    }
    .top-bar .cta-top:hover {
      background: var(--electric-purple);
      border-color: var(--electric-purple);
      color: white;
    }
    /* 主导航 */
    .main-nav {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      position: sticky;
      top: 0;
      z-index: 999;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: all 0.3s;
    }
    .main-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      background: rgba(255,255,255,0.98);
    }
    .brand-logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--deep-indigo);
      letter-spacing: 1px;
    }
    .brand-logo span {
      color: var(--electric-purple);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
    }
    .nav-menu a {
      color: var(--deep-indigo);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-purple);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active-link::after {
      width: 100%;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--deep-indigo);
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--electric-purple);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.3s, transform 0.2s;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: var(--deep-purple);
      color: white;
      transform: translateY(-2px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--electric-purple);
      color: var(--electric-purple);
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline-custom:hover {
      background: var(--electric-purple);
      color: white;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, var(--deep-indigo) 0%, #1F2F5C 50%, var(--electric-purple) 100%);
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.25rem;
      opacity: 0.9;
      margin: 1.2rem 0 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 卡片通用 */
    .feature-card, .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }
    .feature-card:hover, .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-purple {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, #7B2FBE, #9D4EDD);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
      margin-bottom: 1.2rem;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .service-img {
      border-radius: var(--radius-xl);
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
      width: 100%;
      height: auto;
    }
    .stats-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--electric-purple);
      line-height: 1.1;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: #F2F4F9;
      padding: 1rem 1.5rem;
      cursor: pointer;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #E9ECF5;
    }
    .faq-answer {
      padding: 0 1.5rem 1rem;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .footer {
      background: var(--deep-indigo);
      color: var(--starlight-silver);
      padding: 3rem 0 1.5rem;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        padding: 1rem;
      }
      .nav-menu.open {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .stats-number {
        font-size: 2.2rem;
      }
    }