/* roulang page: index */
/* ----- 全局重置与变量 ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --yi-primary: #F15A24;
      --yi-secondary: #1B2A3A;
      --yi-bg: #F7F5F4;
      --yi-accent: #00B894;
      --yi-gradient: linear-gradient(135deg, #F15A24 0%, #1B2A3A 100%);
      --yi-text: #1B2A3A;
      --yi-text-soft: rgba(27, 42, 58, 0.8);
      --yi-border: #E2E0DD;
      --yi-card-bg: #FFFFFF;
      --yi-radius-lg: 16px;
      --yi-radius-xl: 50px;
      --yi-radius-md: 8px;
      --yi-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --yi-shadow-hover: 0 16px 32px rgba(0,0,0,0.08);
      --yi-space-section: 100px;
      --yi-transition: all 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, sans-serif;
    }
    body {
      font-family: var(--font-sans);
      background: var(--yi-bg);
      color: var(--yi-text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      :root {
        --yi-space-section: 60px;
      }
      .container {
        padding: 0 16px;
      }
    }

    /* ----- 导航 ----- */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.7);
      transition: var(--yi-transition);
      border-bottom: 1px solid transparent;
    }
    .nav.scrolled {
      background: rgba(255,255,255,0.95);
      border-bottom: 1px solid var(--yi-border);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: var(--yi-secondary);
      text-decoration: none;
    }
    .logo i {
      color: var(--yi-primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--yi-secondary);
      font-size: 16px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--yi-primary);
    }
    .btn-nav {
      background: var(--yi-primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--yi-radius-xl);
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-nav:hover {
      background: #d94e1f;
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--yi-secondary);
      cursor: pointer;
      background: transparent;
      border: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        padding: 24px;
        border-radius: 0 0 24px 24px;
        display: none;
        flex-direction: column;
        gap: 20px;
        box-shadow: 0 12px 30px rgba(0,0,0,0.1);
        background: white;
        z-index: 99;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 18px;
        font-weight: 500;
        text-decoration: none;
        color: var(--yi-secondary);
        padding: 8px 0;
        border-bottom: 1px solid var(--yi-border);
      }
      .mobile-menu .btn-nav {
        text-align: center;
        margin-top: 8px;
      }
    }

    /* ----- Hero ----- */
    .hero {
      padding: 150px 0 100px;
      background: linear-gradient(180deg, #F7F5F4 0%, #fff 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 48px;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      background: var(--yi-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--yi-text-soft);
      margin-bottom: 28px;
    }
    .badge-group {
      display: flex;
      gap: 24px;
      margin: 32px 0 40px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: rgba(241,90,36,0.05);
      backdrop-filter: blur(4px);
      border-radius: 12px;
      padding: 8px 20px;
      display: flex;
      flex-direction: column;
    }
    .badge-num {
      font-weight: 700;
      font-size: 28px;
      color: var(--yi-primary);
    }
    .badge-label {
      font-size: 14px;
      color: var(--yi-secondary);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
    }
    .btn-primary {
      background: var(--yi-gradient);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--yi-radius-xl);
      font-weight: 600;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.05);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--yi-primary);
      color: var(--yi-primary);
      padding: 14px 36px;
      border-radius: var(--yi-radius-xl);
      font-weight: 600;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(241,90,36,0.1);
    }
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 360px;
      box-shadow: var(--yi-shadow);
      position: relative;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-visual {
        height: 280px;
        order: -1;
      }
      .badge-group {
        justify-content: center;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }

    /* 通用板块标题 */
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--yi-secondary);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 40px;
      height: 3px;
      background: var(--yi-primary);
      border-radius: 2px;
    }
    section {
      padding: var(--yi-space-section) 0;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .stat-card {
      background: var(--yi-card-bg);
      border-radius: var(--yi-radius-lg);
      padding: 28px 24px;
      box-shadow: var(--yi-shadow);
      transition: var(--yi-transition);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--yi-shadow-hover);
    }
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      background: var(--yi-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .trend-up {
      color: var(--yi-accent);
      font-size: 18px;
      margin-left: 8px;
    }
    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: 1fr 1fr;
      }
      .stat-number {
        font-size: 32px;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .service-card {
      background: white;
      border-radius: var(--yi-radius-lg);
      padding: 28px;
      box-shadow: var(--yi-shadow);
      position: relative;
      overflow: hidden;
      border-left: 4px solid var(--yi-primary);
      transition: var(--yi-transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--yi-shadow-hover);
    }
    .service-icon {
      font-size: 32px;
      color: var(--yi-primary);
      margin-bottom: 16px;
    }
    .service-title {
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 8px;
    }
    .service-desc {
      color: var(--yi-text-soft);
      margin-bottom: 18px;
      flex: 1;
    }
    .arrow-link {
      color: var(--yi-primary);
      text-decoration: none;
      font-weight: 500;
      align-self: flex-start;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区 */
    .compare-table {
      display: flex;
      gap: 20px;
      margin-top: 32px;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: 16px;
      padding: 28px 24px;
      box-shadow: var(--yi-shadow);
    }
    .compare-highlight {
      background: var(--yi-gradient);
      color: white;
      transform: scale(1.02);
      box-shadow: var(--yi-shadow-hover);
    }
    .compare-highlight .compare-title {
      color: white;
    }
    .compare-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .compare-item {
      padding: 12px 0;
      border-bottom: 1px solid var(--yi-border);
    }
    .compare-highlight .compare-item {
      border-color: rgba(255,255,255,0.2);
    }
    @media (max-width: 768px) {
      .compare-table {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-list {
      margin-top: 28px;
    }
    .faq-item {
      border-bottom: 1px solid var(--yi-border);
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px 0;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--yi-text-soft);
      padding-left: 40px;
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      padding-bottom: 20px;
    }
    .faq-item.active {
      background: rgba(241,90,36,0.03);
      border-radius: 8px;
    }

    /* CTA */
    .cta-section {
      background: var(--yi-gradient);
      border-radius: 24px;
      padding: 60px 48px;
      display: flex;
      align-items: center;
      gap: 48px;
      color: white;
    }
    .cta-text {
      flex: 1;
    }
    .cta-form {
      flex: 1;
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      padding: 32px;
      border-radius: 20px;
    }
    .input-group {
      margin-bottom: 20px;
    }
    .input-group input, .input-group select {
      width: 100%;
      padding: 14px;
      background: white;
      border: 1px solid transparent;
      border-radius: 8px;
      font-size: 16px;
      outline: none;
      transition: 0.2s;
    }
    .input-group input:focus, .input-group select:focus {
      border-color: var(--yi-primary);
      box-shadow: 0 0 0 2px rgba(241,90,36,0.2);
    }
    .btn-submit {
      width: 100%;
      background: white;
      color: var(--yi-primary);
      font-weight: 700;
      padding: 16px;
      border: none;
      border-radius: 50px;
      font-size: 18px;
      cursor: pointer;
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .cta-section {
        flex-direction: column;
        padding: 32px 24px;
      }
    }

    footer {
      background: var(--yi-secondary);
      color: #ccc;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    .footer-links a {
      color: #aaa;
      text-decoration: none;
      margin-right: 24px;
    }