/* roulang page: index */
:root {
      --primary-deep: #0A0F1E;
      --brand-gradient: linear-gradient(135deg, #00F2FE 0%, #4FACFE 50%, #F093FB 100%);
      --highlight-cyan: #00F2FE;
      --warm-coral: #FF6B6B;
      --bg-light: #F5F7FB;
      --card-white: #FFFFFF;
      --text-main: #0A0F1E;
      --text-secondary: #3A4A5C;
      --text-muted: #6B7B8D;
      --border-light: #E8ECF1;
      --radius-card: 24px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --shadow-card: 0 4px 20px rgba(10,15,30,0.06);
      --shadow-hover: 0 12px 32px rgba(0,242,254,0.12);
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --sidebar-width: 240px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      display: flex;
      min-height: 100vh;
    }

    /* 左侧 App Shell 导航 */
    .app-sidebar {
      width: var(--sidebar-width);
      background: var(--primary-deep);
      color: white;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      z-index: 50;
      box-shadow: 4px 0 24px rgba(0,0,0,0.2);
      transition: transform 0.3s ease;
    }

    .sidebar-logo {
      padding: 28px 24px 20px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--highlight-cyan);
    }

    .logo-text {
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.5px;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-menu {
      list-style: none;
      padding: 0 12px;
      flex: 1;
    }

    .nav-item {
      margin-bottom: 6px;
    }

    .nav-link {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 12px 16px;
      border-radius: 12px;
      color: #8A9BB5;
      font-weight: 500;
      font-size: 15px;
      text-decoration: none;
      transition: var(--transition-smooth);
      position: relative;
    }

    .nav-link i {
      font-size: 1.2rem;
      width: 20px;
      text-align: center;
      color: var(--highlight-cyan);
      transition: var(--transition-smooth);
    }

    .nav-link:hover {
      background: rgba(0,242,254,0.08);
      color: #FFFFFF;
    }

    .nav-link:hover i {
      color: white;
    }

    .nav-link.active {
      background: rgba(0,242,254,0.12);
      color: white;
      font-weight: 600;
      box-shadow: inset 3px 0 0 var(--highlight-cyan);
    }

    .nav-link.active i {
      color: white;
    }

    /* 右侧主内容区 */
    .main-content {
      margin-left: var(--sidebar-width);
      flex: 1;
      width: calc(100% - var(--sidebar-width));
      background: var(--bg-light);
    }

    .section {
      padding: 80px 0;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.2;
      color: var(--text-main);
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* Hero 首屏 */
    #hero {
      height: 100vh;
      background: var(--primary-deep);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
    }

    .hero-bg-image {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 1;
      mask-image: radial-gradient(circle at 70% 30%, black 30%, transparent 80%);
    }

    .hero-gradient {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 80% 20%, rgba(0,242,254,0.18) 0%, transparent 60%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
      margin-left: 60px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      color: white;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .gradient-text {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 28px;
      max-width: 560px;
    }

    .badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 32px;
    }

    .badge {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 14px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .badge strong {
      color: var(--highlight-cyan);
      font-weight: 700;
      font-family: 'Inter', sans-serif;
    }

    .btn-primary {
      background: var(--brand-gradient);
      border: none;
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(0,242,254,0.4);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--highlight-cyan);
      color: var(--highlight-cyan);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(0,242,254,0.1);
      color: var(--highlight-cyan);
    }

    /* 统计卡片 */
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .stat-number {
      font-family: 'Inter', 'SF Pro Display', sans-serif;
      font-size: 44px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F2FE, #4FACFE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      height: 100%;
    }

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

    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .card-body {
      padding: 28px;
    }

    .comparison-left {
      background: #EEF1F5;
      border-radius: var(--radius-card);
      padding: 32px;
    }

    .comparison-right {
      background: linear-gradient(135deg, rgba(0,242,254,0.06) 0%, rgba(240,147,251,0.06) 100%);
      border: 1px solid rgba(0,242,254,0.2);
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
    }

    .faq-item {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 12px;
      transition: var(--transition-smooth);
    }

    .faq-item[open] {
      border-left: 4px solid var(--highlight-cyan);
      background: #F5F9FD;
    }

    .faq-summary {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 17px;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
    }

    .contact-section {
      background: var(--primary-deep);
      border-radius: 32px;
      padding: 60px 40px;
      color: white;
    }

    .footer {
      background: var(--primary-deep);
      color: #6B7B8D;
      padding: 32px 0;
      text-align: center;
    }

    /* 移动端响应式 */
    @media (max-width: 1023px) {
      .app-sidebar {
        transform: translateX(-100%);
        width: 260px;
      }
      .sidebar-open .app-sidebar {
        transform: translateX(0);
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-header {
        display: flex;
        background: var(--primary-deep);
        height: 56px;
        align-items: center;
        padding: 0 20px;
        position: fixed;
        top: 0;
        width: 100%;
        z-index: 55;
        justify-content: space-between;
      }
      .menu-toggle {
        background: none;
        border: none;
        color: white;
        font-size: 24px;
      }
      .hero-content {
        margin-left: 20px;
        margin-right: 20px;
      }
      h1 {
        font-size: 36px;
      }
      .section {
        padding: 48px 0;
      }
      .container-custom {
        padding: 0 20px;
      }
    }

    @media (min-width: 1024px) {
      .mobile-header {
        display: none;
      }
    }

.input-field {
      border-radius: 8px; border:1px solid #D0D7E2; padding:12px; background:white;
    }
    .input-field:focus {
      border-color: var(--highlight-cyan);
      box-shadow: 0 0 0 3px rgba(0,242,254,0.15);
      outline: none;
    }
    @media (max-width:640px) {
      .hero h1 { font-size:32px; }
    }