/* roulang page: index */
:root {
      --primary: #0A4DA4;
      --accent: #00C2FF;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text: #1E2A3A;
      --text-secondary: #6B7C93;
      --gradient: linear-gradient(135deg, #0A4DA4 0%, #00C2FF 100%);
      --shadow: 0 4px 20px rgba(10, 77, 164, 0.06), 0 1px 4px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(10, 77, 164, 0.12);
      --radius: 12px;
      --btn-radius: 8px;
      --gap: 32px;
      --max-width: 1200px;
      --section-padding: 100px 0;
      --nav-height: 72px;
      --font-h1: 48px;
      --font-h2: 36px;
      --font-h3: 24px;
      --font-body: 16px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .section-container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: var(--section-padding);
    }
    h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: 1px;
    }
    h2 {
      font-size: var(--font-h2);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    h3 {
      font-size: var(--font-h3);
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 12px;
    }
    h4 {
      font-weight: 600;
      font-size: 18px;
    }
    p, li {
      font-size: var(--font-body);
      font-weight: 400;
      color: var(--text);
    }
    .text-secondary {
      color: var(--text-secondary);
      font-size: 14px;
    }
    a {
      text-decoration: none;
      color: var(--primary);
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--gradient);
      color: #fff;
      border: none;
      padding: 14px 36px;
      border-radius: var(--btn-radius);
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: inline-block;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(10,77,164,0.2);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 16px rgba(0,194,255,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 12px 34px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      display: inline-block;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(10,77,164,0.05);
      border-color: var(--accent);
      color: var(--accent);
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 32px;
      transition: all 0.25s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
      gap: var(--gap);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
      gap: var(--gap);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      height: var(--nav-height);
      background: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 100;
      border-bottom: 1px solid rgba(0,0,0,0.03);
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 28px;
      filter: drop-shadow(0 2px 4px rgba(0,194,255,0.3));
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--text);
      transition: 0.2s;
      position: relative;
      font-size: 15px;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 3px;
      background: var(--accent);
      bottom: 0;
      left: 0;
      transition: 0.25s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    /* Hero */
    .hero-section {
      padding-top: calc(var(--nav-height) + 40px);
      background: linear-gradient(180deg, #FFFFFF 0%, var(--bg) 100%);
    }
    .hero-flex {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 55%;
    }
    .hero-text h1 {
      margin-bottom: 16px;
      color: var(--primary);
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 30px;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .hero-image {
      flex: 1 1 40%;
      min-height: 300px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(10,77,164,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    /* features 图标圆形容器 */
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 32px;
      color: white;
    }
    /* services 参数技法点缀 */
    .param-list {
      list-style: none;
      margin: 16px 0;
    }
    .param-list li {
      padding-left: 24px;
      position: relative;
      margin-bottom: 8px;
      font-size: 15px;
    }
    .param-list li::before {
      content: '●';
      position: absolute;
      left: 0;
      color: var(--accent);
      font-size: 18px;
    }
    .tag {
      background: rgba(0,194,255,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    /* scenarios */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 60px;
    }
    .scenario-img {
      flex: 1 1 45%;
      min-height: 260px;
      background-color: #e0ebff;
      border-radius: 16px;
      background-size: cover;
      background-position: center;
    }
    /* cases */
    .case-card {
      background: #EDF3FA;
      border-radius: var(--radius);
      padding: 32px;
      text-align: center;
      box-shadow: none;
    }
    .case-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #e0e8f0;
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--accent);
    }
    /* CTA底 */
    .cta-section {
      background: linear-gradient(135deg, #EDF3FA 0%, #F7F9FC 100%);
      text-align: center;
    }
    /* footer */
    .footer {
      background: var(--primary);
      color: white;
      padding: 28px 0 4px;
    }
    .footer a {
      color: rgba(255,255,255,0.8);
    }
    /* 移动端 */
    @media (max-width: 768px) {
      :root {
        --font-h1: 32px;
        --font-h2: 28px;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: var(--nav-height);
        right: 0;
        width: 220px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        padding: 20px;
        border-radius: 0 0 12px 12px;
      }
      .nav-links.mobile-visible {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-flex, .scenario-row {
        flex-direction: column;
      }
      .hero-stats {
        flex-wrap: wrap;
      }

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      .navbar {
        padding: 0 20px;
      }
      section {
        padding-top: 60px;
        padding-bottom: 60px;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        text-align: center;
      }
      .case-card {
        padding: 24px;
      }
    }
    @media (max-width: 480px) {
      .hero-text h1 {
        font-size: 28px;
      }
      .hero-sub {
        font-size: 16px;
      }
      .card {
        padding: 24px;
      }
      .stat-number {
        font-size: 24px;
      }
      .case-number {
        font-size: 36px;
      }
    }
    .highlight-blue {
      color: var(--accent);
      font-weight: 700;
    }
    .section-title {
      text-align: center;
      margin-bottom: 40px;
    }
    .section-title p {
      max-width: 600px;
      margin: 8px auto 0;
    }
    .icon-placeholder-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      background: #e9f0fc;
    }
    .backpic-cover {
      background-size: cover;
      background-position: center;
    }