/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D03E1A;
      --dark: #1E1E1E;
      --dark-soft: #2A2A2A;
      --white: #FAFAFA;
      --gold: #D4A843;
      --gray-light: #F5F5F5;
      --gray-border: #E0E0E0;
      --text-main: #1E1E1E;
      --text-soft: rgba(255,255,255,0.7);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --container: 1280px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #ffffff;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
      line-height: 1;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: 2px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--dark);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--dark);
      padding: 80px 32px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      transition: right 0.35s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }
    .mobile-menu a:hover {
      color: var(--primary);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1E1E1E 0%, #2A2A2A 100%);
      padding: 140px 0 80px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(240,78,35,0.25) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background var(--transition), transform 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .data-mini-dash {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .stat-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      padding: 16px 20px;
      border-radius: 8px;
      min-width: 130px;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 13px;
      color: rgba(255,255,255,0.7);
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section-head {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-head h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .section-head p {
      color: #666;
      max-width: 600px;
      margin: 0 auto;
    }

    /* 优势 2:1:1 */
    .strength-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .card-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }
    .card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .card-desc {
      color: #555;
      margin-bottom: 16px;
      font-size: 15px;
    }
    .card-stat {
      color: var(--primary);
      font-weight: 700;
      font-size: 24px;
    }

    /* 服务四列 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: linear-gradient(135deg, #F04E23, #1E1E1E);
    }
    .service-body {
      padding: 20px;
    }
    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .service-body p {
      font-size: 14px;
      color: #777;
      margin: 8px 0 11px;
    }
    .arrow-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
    }

    /* 对比 */
    .compare-wrapper {
      background: #F5F5F5;
      border-radius: 16px;
      padding: 40px;
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      min-width: 240px;
    }
    .compare-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .compare-item {
      margin-bottom: 20px;
    }
    .bar-label {
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      margin-bottom: 6px;
    }
    .bar-bg {
      height: 8px;
      background: #ddd;
      border-radius: 8px;
      overflow: hidden;
    }
    .bar-fill {
      height: 100%;
      border-radius: 8px;
      width: 0%;
    }
    .left-bar {
      background: #aaa;
    }
    .right-bar {
      background: var(--primary);
    }
    .gold-tag {
      background: var(--gold);
      color: #000;
      padding: 2px 8px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: 700;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #555;
      padding-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .cta-band {
      background: var(--primary);
      padding: 70px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 600px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1 1 180px;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: 1px solid var(--gray-border);
      background: white;
    }
    .cta-form button {
      background: var(--dark);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
    }
    .trust-badges {
      margin-top: 24px;
      font-size: 14px;
      opacity: 0.9;
    }

    /* Footer */
    .footer {
      background: var(--dark);
      color: var(--text-soft);
      padding: 56px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover {
      color: var(--primary);
    }
    .copyright {
      text-align: center;
      margin-top: 32px;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .strength-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero h1 {
        font-size: 38px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
      .hero-grid {
        flex-direction: column;
      }
      .strength-grid {
        grid-template-columns: 1fr;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-form {
        flex-direction: column;
        align-items: center;
      }
      .compare-wrapper {
        flex-direction: column;
      }
    }