/* roulang page: index */
:root {
      /* 色彩体系 */
      --primary-blue: #1A3B5C;
      --accent-orange: #F15A24;
      --deep-orange: #E04A1A;
      --bg-light: #F8FAFC;
      --white: #FFFFFF;
      --bg-soft-blue: #EDF2F7;
      --text-dark: #0F1A2E;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --success-green: #10B981;
      --warning-yellow: #F59E0B;
      
      /* 阴影与圆角 */
      --shadow-card: 0px 4px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0px 8px 24px rgba(26,59,92,0.08);
      --shadow-nav: 0px 1px 0px rgba(0,0,0,0.04);
      --shadow-nav-scrolled: 0px 2px 8px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 40px;
      
      /* 间距栅格 */
      --space-xs: 8px;
      --space-sm: 16px;
      --space-md: 24px;
      --space-lg: 32px;
      --space-xl: 48px;
      --space-2xl: 64px;
      --space-3xl: 100px;
      
      /* 字体 */
      --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-main);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 容器 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    @media (min-width: 1024px) {
      .container {
        padding: 0 40px;
      }
    }
    
    /* 图片 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 链接与按钮重置 */
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    button, input, textarea {
      font-family: inherit;
      font-size: 16px;
    }
    
    /* 标题层级 */
    h1 {
      font-size: clamp(36px, 5vw, 52px);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: clamp(28px, 4vw, 38px);
      font-weight: 600;
      color: var(--primary-blue);
      margin-bottom: var(--space-sm);
      position: relative;
      display: inline-block;
    }
    
    .section-title-wrapper {
      margin-bottom: var(--space-xl);
    }
    
    .section-title-wrapper h2::after {
      content: '';
      display: block;
      width: 48px;
      height: 4px;
      background: var(--accent-orange);
      margin-top: var(--space-xs);
      border-radius: 2px;
    }
    
    .section-title-wrapper.center {
      text-align: center;
    }
    
    .section-title-wrapper.center h2::after {
      margin-left: auto;
      margin-right: auto;
    }
    
    h3 {
      font-size: clamp(20px, 2.5vw, 24px);
      font-weight: 600;
      color: var(--primary-blue);
    }
    
    /* 板块间距 */
    section {
      padding: var(--space-3xl) 0;
    }
    
    /* ------- 导航 ------- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      box-shadow: var(--shadow-nav);
      z-index: 1000;
      transition: box-shadow 0.25s ease;
      display: flex;
      align-items: center;
    }
    
    .site-header.scrolled {
      box-shadow: var(--shadow-nav-scrolled);
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary-blue);
      white-space: nowrap;
      letter-spacing: -0.5px;
    }
    
    .logo span {
      color: var(--accent-orange);
    }
    
    .main-nav {
      display: flex;
      align-items: center;
      gap: var(--space-lg);
    }
    
    .main-nav a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }
    
    .main-nav a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      border-radius: 2px;
      transition: width 0.2s ease;
    }
    
    .main-nav a:hover {
      color: var(--accent-orange);
    }
    
    .main-nav a:hover::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
      z-index: 1001;
    }
    
    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--primary-blue);
      border-radius: 2px;
      transition: 0.3s ease;
    }
    
    .hamburger.active span:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
      opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    
    @media (max-width: 1023px) {
      .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: 0;
        overflow: hidden;
        background: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 0 20px;
        box-shadow: var(--shadow-nav-scrolled);
        transition: height 0.3s ease, padding 0.3s ease;
        gap: 0;
      }
      
      .main-nav.open {
        height: calc(100vh - 72px);
        padding: 20px;
      }
      
      .main-nav a {
        width: 100%;
        padding: 14px 0;
        font-size: 18px;
        border-bottom: 1px solid var(--border-light);
      }
      
      .hamburger {
        display: flex;
      }
    }
    
    /* ------- 按钮 ------- */
    .btn {
      display: inline-block;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
      cursor: pointer;
      text-align: center;
      border: 2px solid transparent;
    }
    
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-color: var(--accent-orange);
    }
    
    .btn-primary:hover {
      background: var(--deep-orange);
      border-color: var(--deep-orange);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(241,90,36,0.3);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--primary-blue);
      border-color: var(--primary-blue);
    }
    
    .btn-outline:hover {
      background: var(--primary-blue);
      color: white;
      transform: translateY(-1px);
    }
    
    .btn-white {
      background: white;
      color: var(--primary-blue);
      border-color: white;
    }
    
    .btn-white:hover {
      background: #f0f4f8;
      border-color: #f0f4f8;
      transform: translateY(-1px);
    }
    
    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: var(--space-lg);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    
    /* ------- HERO ------- */
    #hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #F8FAFC 0%, #EDF2F7 100%);
      position: relative;
      overflow: hidden;
    }
    
    .hero-container {
      display: flex;
      align-items: center;
      gap: var(--space-2xl);
    }
    
    .hero-left {
      flex: 1 1 50%;
    }
    
    .hero-left p.subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin: var(--space-sm) 0 var(--space-lg);
      max-width: 480px;
    }
    
    .hero-buttons {
      display: flex;
      gap: var(--space-sm);
      flex-wrap: wrap;
    }
    
    .hero-right {
      flex: 1 1 50%;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      border-radius: 20px;
      padding: var(--space-xl);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: var(--space-md);
      box-shadow: 0px 8px 30px rgba(26,59,92,0.08);
      border: 1px solid rgba(255,255,255,0.6);
    }
    
    .stat-item {
      text-align: center;
      min-width: 100px;
    }
    
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary-blue);
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    
    .stat-number span.accent {
      color: var(--accent-orange);
      font-size: 0.7em;
    }
    
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }
    
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
      }
      
      .hero-right {
        width: 100%;
        justify-content: center;
      }
      
      .stat-number {
        font-size: 36px;
      }
    }
    
    /* ------- 核心优势 ------- */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: var(--space-lg);
    }
    
    .advantage-card i {
      font-size: 36px;
      color: var(--accent-orange);
      margin-bottom: var(--space-sm);
      display: inline-block;
      transition: transform 0.3s;
    }
    
    .advantage-card:hover i {
      transform: scale(1.15);
    }
    
    /* ------- 服务矩阵 ------- */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-md);
    }
    
    .service-card {
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    
    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    
    .service-content {
      padding: var(--space-md);
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    
    .service-link {
      color: var(--accent-orange);
      font-weight: 600;
      margin-top: var(--space-sm);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }
    
    .service-link:hover {
      gap: 8px;
    }
    
    @media (max-width: 1023px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* ------- 数据对比 ------- */
    .compare-wrapper {
      display: flex;
      gap: var(--space-xl);
      align-items: center;
      flex-wrap: wrap;
    }
    
    .compare-col {
      flex: 1 1 280px;
      padding: var(--space-xl);
      border-radius: var(--radius-card);
    }
    
    .before-col {
      background: #fef9e7;
      border-left: 6px solid var(--warning-yellow);
    }
    
    .after-col {
      background: #e6f9f2;
      border-left: 6px solid var(--success-green);
    }
    
    .compare-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px dashed rgba(0,0,0,0.08);
    }
    
    .compare-value {
      font-weight: 700;
      font-size: 22px;
    }
    
    /* ------- 流程 ------- */
    .process-track {
      display: flex;
      justify-content: space-between;
      position: relative;
      gap: 20px;
    }
    
    .process-step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    
    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: white;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      margin: 0 auto 12px;
      transition: 0.2s;
      position: relative;
      z-index: 2;
    }
    
    .process-step:hover .step-circle {
      background: var(--accent-orange);
      border-color: var(--accent-orange);
      color: white;
    }
    
    .process-line {
      position: absolute;
      top: 28px;
      left: 15%;
      right: 15%;
      height: 2px;
      background: repeating-linear-gradient(90deg, var(--primary-blue) 0px, var(--primary-blue) 6px, transparent 6px, transparent 10px);
      z-index: 1;
    }
    
    @media (max-width: 768px) {
      .process-track {
        flex-wrap: wrap;
        justify-content: center;
      }
      .process-line {
        display: none;
      }
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: var(--space-md) 0;
    }
    
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      color: var(--text-body);
    }
    
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary-blue);
      color: white;
    }
    
    .cta-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 24px;
    }
    
    .cta-form input, .cta-form textarea {
      flex: 1 1 200px;
      padding: 14px 18px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      background: white;
    }
    
    .cta-form input:focus {
      border-color: var(--accent-orange);
      box-shadow: 0 0 0 3px rgba(241,90,36,0.2);
      outline: none;
    }
    
    /* 页脚 */
    .site-footer {
      background: #0F1A2E;
      color: #cbd5e1;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }
    
    .footer-links a {
      display: block;
      color: #cbd5e1;
      margin-bottom: 8px;
    }
    
    .footer-links a:hover { color: var(--accent-orange); }