/* roulang page: index */
:root {
      --primary-blue: #1A56DB;
      --primary-blue-hover: #1542A8;
      --warm-gold: #C88A3D;
      --warm-gold-hover: #A6702E;
      --deep-gray: #1E293B;
      --slate: #475569;
      --light-gray-bg: #F1F5F9;
      --alt-bg: #F8FAFC;
      --white: #FFFFFF;
      --border-light: #E2E8F0;
      --text-muted: #94A3B8;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(26,86,219,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--slate);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    h1, h2, h3 {
      color: var(--deep-gray);
      font-weight: 600;
    }

    h1 {
      font-size: 36px;
      letter-spacing: -0.5px;
      font-weight: 700;
    }

    h2 {
      font-size: 28px;
      letter-spacing: -0.3px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    p {
      color: var(--slate);
    }

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

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

    button, input {
      font-family: var(--font-sans);
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-blue);
      white-space: nowrap;
    }
    .logo span {
      color: var(--text-muted);
      font-weight: 400;
      font-size: 14px;
      margin-left: 6px;
    }

    .nav-chips {
      display: flex;
      gap: 8px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: var(--light-gray-bg);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 500;
      color: var(--slate);
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-chip:hover {
      background: #DBEAFE;
      color: var(--primary-blue);
    }
    .nav-chip.active {
      background: var(--primary-blue);
      color: white;
    }

    .btn-primary {
      background: var(--primary-blue);
      color: white;
      border: none;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-blue-hover);
    }
    .btn-primary:active {
      transform: translateY(1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: #EBF2FF;
    }

    .btn-gold {
      background: var(--warm-gold);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-gold:hover {
      background: var(--warm-gold-hover);
    }
    .btn-gold:active {
      transform: translateY(1px);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--deep-gray);
      transition: var(--transition);
    }

    @media (max-width: 640px) {
      .nav-chips, .header .btn-primary {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        border-bottom: 1px solid var(--border-light);
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
        z-index: 49;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu .nav-chip {
        display: block;
        width: 100%;
        text-align: center;
        padding: 12px;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: var(--white);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(255,255,255,0.85);
    }
    .hero .container {
      position: relative;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 60%;
    }
    .hero-right {
      flex: 0 0 40%;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--slate);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .data-mini {
      background: white;
      border-radius: var(--radius-card);
      padding: 16px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .data-mini .num {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--warm-gold);
    }
    .trend-up { color: #16a34a; }
    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; text-align: center; }
      .hero-left, .hero-right { flex: auto; width: 100%; }
      .hero-cta { justify-content: center; }
      .hero-right { flex-direction: row; flex-wrap: wrap; }
      .data-mini { flex: 1; min-width: 120px; }
    }
    @media (max-width: 640px) {
      h1 { font-size: 28px; }
      .hero { padding: 120px 0 60px; }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-alt {
      background: var(--alt-bg);
    }

    /* 价值主张 */
    .values-grid {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .value-large {
      flex: 0 0 50%;
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .value-small-group {
      flex: 0 0 50%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .value-small {
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .value-large:hover, .value-small:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: #DBEAFE;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-blue);
      font-size: 24px;
      margin-bottom: 20px;
    }
    @media (max-width: 768px) {
      .values-grid { flex-direction: column; }
      .value-large, .value-small-group { flex: auto; width: 100%; }
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .metric-num {
      font-size: 48px;
      font-weight: 700;
      font-family: 'Inter', sans-serif;
      color: var(--warm-gold);
      line-height: 1.2;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      background: #f0fdf4;
      color: #16a34a;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      margin: 8px 0;
    }
    @media (max-width: 768px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .metric-num { font-size: 36px; }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: 0.3s ease;
      position: relative;
      overflow: hidden;
      border: 1px solid transparent;
    }
    .service-card:hover {
      border-color: var(--primary-blue);
      box-shadow: var(--shadow-md);
    }
    .service-detail {
      max-height: 0;
      opacity: 0;
      transition: 0.3s ease;
      margin-top: 12px;
      color: var(--slate);
    }
    .service-card:hover .service-detail {
      max-height: 100px;
      opacity: 1;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .services-grid { grid-template-columns: 1fr; }
      .service-detail { max-height: 100px; opacity: 1; }
    }

    /* 对比区 */
    .compare-wrapper {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .compare-col {
      flex: 1;
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
    }
    .vs-badge {
      background: var(--warm-gold);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .compare-list li {
      list-style: none;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    @media (max-width: 768px) {
      .compare-wrapper { flex-direction: column; }
      .vs-badge { display: none; }
    }

    /* FAQ */
    .faq-layout {
      display: flex;
      gap: 40px;
    }
    .faq-left {
      flex: 0 0 30%;
    }
    .faq-right {
      flex: 0 0 70%;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
      color: var(--deep-gray);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s ease;
      padding-left: 16px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
      border-left-color: var(--primary-blue);
    }
    @media (max-width: 640px) {
      .faq-layout { flex-direction: column; }
    }

    /* CTA 区 */
    .cta-section {
      background: linear-gradient(135deg, #1A56DB 0%, #0F3D9E 100%);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-form input {
      padding: 14px 16px;
      border-radius: var(--radius-btn);
      border: none;
      min-width: 200px;
    }
    .privacy-note {
      color: rgba(255,255,255,0.7);
      font-size: 13px;
      margin-top: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-gray);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-links a {
      display: block;
      color: #94A3B8;
      margin-bottom: 8px;
      font-size: 14px;
    }
    .footer-links a:hover { color: white; }
    .copyright {
      text-align: center;
      color: #94A3B8;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }