/* roulang page: index */
:root {
      --primary: #0A2540;
      --accent: #D4A843;
      --bg: #F7F9FC;
      --card: #FFFFFF;
      --text: #2C3E50;
      --text-light: #6B7B8D;
      --danger: #E74C3C;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow: 0 2px 12px rgba(10,37,64,0.06);
      --shadow-hover: 0 8px 24px rgba(10,37,64,0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-data: "Inter", "SF Pro Display", system-ui;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #FFFFFF;
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      display: inline-block;
      margin-left: 2px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--primary);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-nav {
      display: none;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 1023px) {
      section {
        padding: 64px 0;
      }
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
    }
    .btn-primary:hover {
      background: #C29535;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
    }
    .btn-block {
      width: 100%;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F7F9FC 0%, #E8EDF3 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 80vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(247,249,252,0.7);
      backdrop-filter: blur(2px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero h1 span {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 36px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-stats {
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-light);
      margin-top: 4px;
    }

    /* 标题 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary);
      text-align: center;
      margin-bottom: 48px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .metric-value {
      font-family: var(--font-data);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .metric-desc {
      font-size: 15px;
      color: var(--text-light);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card);
      padding: 32px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: #EDF1F6;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      font-size: 24px;
      color: var(--accent);
      transition: background 0.2s;
    }
    .service-card:hover .service-icon {
      background: var(--accent);
      color: #fff;
    }
    .service-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .service-desc {
      color: var(--text-light);
      font-size: 15px;
      flex: 1;
      margin-bottom: 16px;
    }
    .service-link {
      font-weight: 500;
      color: var(--accent);
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 结果对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .compare-box {
      border-radius: var(--radius-card);
      padding: 36px 28px;
    }
    .compare-left {
      background: #FDF2F2;
    }
    .compare-right {
      background: #F0F7F4;
    }
    .compare-heading {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      font-size: 16px;
      margin-bottom: 18px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--text);
    }
    .icon-cross {
      color: #c0392b;
      font-weight: 700;
    }
    .icon-check {
      color: var(--accent);
      font-weight: 700;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #DCE3EA;
      padding: 16px 0;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      text-align: left;
      font-size: 18px;
      font-weight: 600;
      color: var(--primary);
      padding: 16px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      font-size: 16px;
      color: var(--text-light);
      padding: 0 10px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 12px 10px 24px;
    }
    .faq-item.active .faq-question {
      color: var(--accent);
    }
    .arrow {
      font-size: 18px;
      transition: transform 0.2s;
    }
    .faq-item.active .arrow {
      transform: rotate(45deg);
    }

    /* 表单 */
    .contact-section {
      background: #EDF1F6;
    }
    .form-card {
      background: var(--card);
      max-width: 560px;
      margin: 0 auto;
      padding: 36px 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      font-weight: 500;
      display: block;
      margin-bottom: 6px;
      color: var(--primary);
    }
    .form-control {
      width: 100%;
      height: 48px;
      border: 1px solid #DCE3EA;
      border-radius: var(--radius-btn);
      padding: 0 16px;
      font-size: 15px;
      transition: border 0.2s;
      background: #fff;
    }
    textarea.form-control {
      height: 90px;
      padding: 12px 16px;
      resize: vertical;
    }
    .form-control:focus {
      border-color: var(--accent);
    }
    .privacy-note {
      font-size: 12px;
      color: var(--text-light);
      text-align: center;
      margin-top: 12px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CCD6E0;
      padding: 32px 0;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-brand {
      font-weight: 600;
      font-size: 18px;
      color: white;
    }
    .footer-copy {
      font-size: 14px;
      color: #A0B0C0;
    }

    /* 响应式 */
    @media (max-width: 1023px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-nav {
        display: block;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        z-index: 999;
      }
      .mobile-nav.open {
        transform: translateY(0);
      }
      .mobile-nav a {
        display: block;
        padding: 18px 24px;
        font-weight: 500;
        border-bottom: 1px solid #f0f0f0;
        color: var(--primary);
      }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .compare-row { grid-template-columns: 1fr; }
      .hero h1 { font-size: 32px; }
    }

    @media (max-width: 767px) {
      .metrics-grid, .services-grid { grid-template-columns: 1fr; }
      .hero-stats { gap: 24px; }
      .hero h1 { font-size: 28px; }
      .section-title { font-size: 24px; }
      .btn { width: 100%; }
      .hero-cta { flex-direction: column; align-items: center; }
    }