/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --deep-blue: #0A0E27;
      --cyan: #00F0FF;
      --cyan-active: #00C2D1;
      --competitive-red: #FF4655;
      --bg-light: #F5F7FB;
      --card-bg: #FFFFFF;
      --text-primary: #1A1E2B;
      --text-secondary: #5A6170;
      --text-muted: #8A8F9C;
      --border-light: #E9ECF0;
      --shadow-card: 0 8px 30px rgba(10, 14, 39, 0.06);
      --shadow-hover: 0 12px 36px rgba(10, 14, 39, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
    }
    h4 {
      font-size: 18px;
    }

    p {
      color: var(--text-secondary);
      margin-bottom: 1rem;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--cyan-active));
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 14px rgba(0, 240, 255, 0.35);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      border: none;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      filter: brightness(1.08);
      box-shadow: 0 8px 24px rgba(0, 240, 255, 0.55);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      background-color: rgba(0,240,255,0.0);
      font-size: 16px;
    }
    .btn-outline:hover {
      background-color: rgba(0, 240, 255, 0.08);
      border-color: var(--cyan);
      color: var(--cyan);
    }

    /* 导航 PC */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 90;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      height: 70px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 26px;
      font-weight: 800;
      letter-spacing: -1px;
      background: linear-gradient(to right, var(--deep-blue), var(--cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 34px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      transition: 0.2s;
      font-size: 15px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--deep-blue);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      transition: 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
    }

    /* 响应式移动导航 */
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: white;
        border-top: 1px solid var(--border-light);
        justify-content: space-around;
        align-items: center;
        height: 68px;
        z-index: 100;
        padding: 0 12px;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 11px;
        color: var(--text-muted);
        gap: 4px;
        transition: 0.2s;
      }
      .mobile-nav a i {
        font-size: 20px;
      }
      .mobile-nav .cta-mobile {
        background: var(--cyan);
        color: #0A0E27;
        padding: 8px 16px;
        border-radius: 30px;
        font-weight: 700;
        font-size: 14px;
        box-shadow: 0 4px 12px rgba(0,240,255,0.4);
      }
      .top-mobile-logo {
        display: flex;
        justify-content: center;
        padding: 12px 0 8px;
        background: white;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
    }

    /* Hero 区块 */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,14,27,0.85) 0%, rgba(10,14,30,0.6) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 18px;
      font-size: 54px;
    }
    .hero .highlight {
      color: var(--cyan);
    }
    .hero p {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 34px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 24px;
      margin-bottom: 32px;
    }
    .stat-item {
      font-size: 28px;
      font-weight: 700;
      color: var(--cyan);
    }
    .stat-item span {
      display: block;
      font-size: 14px;
      font-weight: 400;
      color: rgba(255,255,255,0.7);
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      color: var(--deep-blue);
    }
    .section-title p {
      font-size: 17px;
      color: var(--text-secondary);
      max-width: 620px;
      margin: 0 auto;
    }

    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      gap: 28px;
    }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid rgba(0,0,0,0.02);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-cyan {
      font-size: 42px;
      color: var(--cyan);
      margin-bottom: 20px;
    }

    /* 场景卡片 */
    .scene-card {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md);
      height: 260px;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: flex-end;
      color: white;
    }
    .scene-overlay {
      background: linear-gradient(0deg, rgba(10,14,27,0.85) 20%, transparent 100%);
      padding: 24px;
      width: 100%;
      z-index: 2;
    }

    /* 案例数字卡片 */
    .case-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--cyan);
    }

    /* 价格卡片 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 38px 28px;
      border: 1.5px solid var(--border-light);
      transition: var(--transition);
    }
    .pricing-card.featured {
      border-color: var(--cyan);
      box-shadow: 0 12px 34px rgba(0,240,255,0.18);
      transform: scale(1.02);
    }
    .price {
      font-size: 46px;
      font-weight: 800;
      color: var(--deep-blue);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA & Footer */
    .cta-section {
      background: var(--deep-blue);
      color: white;
      text-align: center;
    }
    .footer {
      background: #0A0E27;
      color: #B0B8C1;
      padding: 50px 0 24px;
    }

    @media (max-width: 768px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-stats { flex-wrap: wrap; gap: 18px; }
      .hero h1 { font-size: 34px; }
    }