/* roulang page: index */
:root {
      --primary: #0A0F1E;
      --accent: #F5A623;
      --accent-hover: #E09510;
      --bg-page: #F0F2F5;
      --bg-card: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5A5A5A;
      --text-on-dark: #FFFFFF;
      --border-light: #D0D5DD;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(10,15,30,0.06);
      --shadow-card-hover: 0 8px 24px rgba(10,15,30,0.12);
      --shadow-nav: 0 2px 8px rgba(10,15,30,0.04);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --section-gap: 120px;
      --card-padding: 24px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg-card);
      box-shadow: var(--shadow-nav);
      transition: box-shadow 0.3s;
    }
    .site-header.scrolled {
      box-shadow: 0 4px 12px rgba(10,15,30,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color var(--transition);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--bg-card);
      box-shadow: 0 -2px 12px rgba(10,15,30,0.08);
      padding: 8px 16px;
      justify-content: space-around;
      z-index: 60;
      border-radius: 20px 20px 0 0;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-secondary);
      gap: 2px;
      padding: 8px 4px;
      transition: color var(--transition);
    }
    .mobile-nav a i {
      font-size: 18px;
    }
    .mobile-nav a:hover, .mobile-nav a.active {
      color: var(--accent);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-nav { display: flex; }
      .header-inner { height: 60px; }
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
      color: var(--primary);
      text-align: center;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 16px;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 8px rgba(245,166,35,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 14px rgba(245,166,35,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: background 0.2s;
    }
    .btn-outline:hover {
      background: rgba(10,15,30,0.05);
    }

    /* Hero */
    .hero {
      background-color: var(--primary);
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 100px 0 120px;
      color: var(--text-on-dark);
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,15,30,0.65);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 340px;
      filter: drop-shadow(0 8px 20px rgba(0,0,0,0.3));
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-visual img {
        max-height: 240px;
        margin-top: 20px;
      }
    }

    /* 数据看板 */
    .metrics-band {
      background: var(--primary);
      padding: 60px 0;
      color: white;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      font-feature-settings: "tnum";
      letter-spacing: -0.5px;
    }
    .metric-label {
      font-size: 14px;
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .comparison-table {
      display: flex;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      max-width: 900px;
      margin: 0 auto;
    }
    .comparison-col {
      flex: 1;
    }
    .comparison-header {
      padding: 20px;
      font-weight: 700;
      font-size: 20px;
      text-align: center;
      background: #E8E9ED;
      color: var(--text-secondary);
    }
    .comparison-col.right .comparison-header {
      background: var(--primary);
      color: white;
    }
    .comparison-row {
      display: flex;
      border-bottom: 1px solid #e0e0e0;
      background: #F7F7F9;
    }
    .comparison-col.right .comparison-row {
      background: #10152A;
    }
    .comparison-cell {
      padding: 16px 20px;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .comparison-col.right .comparison-cell {
      color: white;
    }
    .comparison-col.right .comparison-cell i {
      color: var(--accent);
    }
    @media (max-width: 640px) {
      .comparison-table {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 8px 0;
      box-shadow: var(--shadow-card);
    }
    .faq-item {
      border-bottom: 1px solid #f0f0f0;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 24px;
      font-size: 17px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-main);
      transition: color 0.2s;
    }
    .faq-question i {
      font-size: 18px;
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafbfc;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* CTA 表单 */
    .cta-dark {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 700px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1 1 200px;
      padding: 14px 16px;
      border-radius: 6px;
      border: 1px solid var(--border-light);
      background: white;
      font-size: 16px;
    }
    .cta-form input:focus {
      border-color: var(--accent);
    }
    .cta-form .btn-primary {
      flex: 0 0 auto;
      width: auto;
    }
    @media (max-width: 640px) {
      .cta-form {
        flex-direction: column;
      }
      .cta-form .btn-primary {
        width: 100%;
      }
    }

    /* 页脚 */
    .footer {
      background: #F0F2F5;
      padding: 60px 0 30px;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .footer a {
      color: var(--text-secondary);
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 辅助样式 */
    .text-accent {
      color: var(--accent);
    }