/* roulang page: index */
:root {
      --color-primary: #0A0E27;
      --color-accent: #D7263D;
      --color-highlight: #00E5FF;
      --color-bg: #F5F7FA;
      --color-card: #FFFFFF;
      --color-card-alt: #F0F2F5;
      --color-text: #1A1F36;
      --color-text-soft: #5A6070;
      --color-text-on-dark: #FFFFFF;
      --gradient-primary: linear-gradient(135deg, #0A0E27, #1B1F3B);
      --gradient-cta: linear-gradient(135deg, #D7263D, #FF4D6A);
      --gradient-badge: linear-gradient(90deg, #00E5FF, #0097A7);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 20px rgba(10,14,39,0.06);
      --shadow-hover: 0 12px 32px rgba(10,14,39,0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 自定义卡片阴影 */
    .card-shadow {
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.25s ease, transform 0.25s ease;
    }
    .card-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    /* 脉冲动画徽章 */
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.4); }
      70% { box-shadow: 0 0 0 10px rgba(0, 229, 255, 0); }
      100% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0); }
    }
    .badge-pulse {
      animation: pulse-glow 2s infinite;
    }

    /* 导航卡片面板 */
    .nav-panel {
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 24px rgba(0,0,0,0.25);
    }

    .nav-item-active {
      border-left: 3px solid var(--color-highlight);
      background: rgba(255,255,255,0.08);
    }

    /* FAQ手风琴箭头 */
    .faq-arrow {
      transition: transform 0.25s ease;
    }
    .faq-open .faq-arrow {
      transform: rotate(180deg);
    }

    /* 案例卡片覆盖层 */
    .case-overlay {
      background: linear-gradient(0deg, rgba(10,14,39,0.7) 0%, rgba(10,14,39,0.1) 60%);
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-card:hover .case-img {
      transform: scale(1.04);
    }
    .case-img {
      transition: transform 0.4s ease;
    }

    /* 表单聚焦 */
    .input-field {
      background: #F0F2F5;
      border: 1px solid transparent;
      border-radius: 10px;
      padding: 14px 16px;
      transition: border 0.2s, background 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--color-highlight);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(0,229,255,0.1);
    }

    /* 底部导航栏移动端 */
    .mobile-bottom-nav {
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(20px);
      border-radius: 24px 24px 0 0;
    }