/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --primary-soft: rgba(10, 31, 63, 0.05);
      --secondary: #00A86B;
      --secondary-hover: #008F5A;
      --white: #FFFFFF;
      --bg-light: #F4F7FC;
      --text-dark: #0A1F3F;
      --text-muted: #4B5C6B;
      --text-light: #8A9BAE;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(10, 31, 63, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 31, 63, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-data: "Inter", "Roboto", system-ui, sans-serif;
      --transition: 0.25s cubic-bezier(0.2, 0.0, 0.0, 1.0);
      --max-width: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.2rem, 6vw, 3.4rem);
      color: var(--primary);
    }

    h2 {
      font-size: clamp(1.8rem, 5vw, 2.5rem);
      margin-bottom: 0.5rem;
      color: var(--primary);
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      font-weight: 400;
      margin-bottom: 2.5rem;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      font-weight: 600;
    }

    .btn-primary {
      background: var(--secondary);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(0, 168, 107, 0.3);
    }
    .btn-primary:hover {
      background: var(--secondary-hover);
      box-shadow: 0 6px 18px rgba(0, 143, 90, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--white);
      z-index: 1000;
      transition: box-shadow var(--transition);
      border-bottom: 1px solid transparent;
    }
    .header-shadow {
      box-shadow: 0 4px 20px rgba(10, 31, 63, 0.04);
      border-bottom-color: var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .brand {
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .brand span {
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--secondary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--white);
      box-shadow: -10px 0 30px rgba(0,0,0,0.08);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 2rem;
      transition: right 0.3s ease;
      z-index: 1100;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }

    /* Hero */
    .hero {
      padding: calc(var(--nav-height) + 40px) 0 60px;
      background-color: #F8FAFE;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 1.2rem;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .data-dashboard {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      background: var(--white);
      border-radius: 24px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      backdrop-filter: blur(2px);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
    }
    .metric-card {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 20px 16px;
      text-align: center;
      flex: 1 1 110px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    .metric-number {
      font-family: var(--font-data);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .bg-light {
      background: var(--bg-light);
    }
    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 2.5rem;
      color: var(--secondary);
      margin-bottom: 1.2rem;
    }
    .service-card h4 {
      font-size: 1.4rem;
      margin-bottom: 0.75rem;
    }
    .service-card p {
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      flex: 1;
    }
    .card-arrow {
      color: var(--secondary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    /* 数据看板板块 */
    .dark-metrics {
      background: var(--primary);
      border-radius: 24px;
      padding: 48px 32px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      color: white;
    }
    .dark-stat h4 {
      font-family: var(--font-data);
      font-size: 2.8rem;
      color: var(--secondary);
    }
    .progress-bar {
      height: 6px;
      background: rgba(255,255,255,0.2);
      border-radius: 10px;
      margin: 12px 0;
      width: 100%;
    }
    .progress-fill {
      height: 100%;
      background: var(--secondary);
      border-radius: 10px;
      width: 0%;
      transition: width 1.2s ease;
    }

    /* 对比区 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      max-width: 900px;
      margin: 0 auto;
    }
    .compare-card {
      background: var(--white);
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.right {
      border: 2px solid var(--secondary);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .check {
      color: var(--secondary);
      font-weight: 700;
    }
    .cross {
      color: #cbd5e0;
    }

    /* 合作品牌 */
    .brand-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      align-items: center;
      opacity: 0.8;
    }
    .brand-wall img {
      height: 38px;
      filter: grayscale(0.2);
    }

    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      color: var(--primary);
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: var(--bg-light);
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .faq-answer p {
      padding: 16px 20px;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 160px;
    }

    /* CTA */
    .cta-dark {
      background: var(--primary);
      border-radius: 24px;
      padding: 60px 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-text h2 {
      color: white;
    }
    .cta-text p {
      color: rgba(255,255,255,0.75);
      font-size: 1.1rem;
    }
    .cta-form input {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-input);
      border: 1px solid var(--border-light);
      margin-bottom: 14px;
      font-family: var(--font-sans);
    }
    .cta-form input:focus {
      outline: none;
      border-color: var(--secondary);
    }

    footer {
      background: var(--bg-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .dark-metrics { grid-template-columns: repeat(2, 1fr); }
      .compare-grid { grid-template-columns: 1fr; }
      .cta-dark { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .cards-grid { grid-template-columns: 1fr; }
      .dark-metrics { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .dark-metrics { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }