/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --deep-anchor: #0F3D9E;
      --amber: #F6B83D;
      --bg-page: #FAFBFD;
      --card-bg: #FFFFFF;
      --dark-bg: #0B1E3C;
      --text-main: #1A1F2E;
      --text-secondary: #5A6278;
      --text-muted: #8E95A9;
      --border-light: #E5E8F0;
      --border-heavy: #DCE2F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 12px rgba(26,95,220,0.06);
      --shadow-hover: 0 8px 28px rgba(26,95,220,0.12);
      --max-width: 1280px;
      --header-height: 72px;
      --mobile-nav-height: 60px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --font-mono: 'DIN Alternate', 'SF Mono', 'Menlo', monospace;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      padding-bottom: var(--mobile-nav-height);
      transition: background-color 0.2s;
    }
    
    img {
      max-width: 100%;
      display: block;
      height: auto;
      border-radius: inherit;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, background-color 0.2s, border-color 0.2s;
    }
    
    button, input {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: transparent;
      transition: background 0.25s ease, box-shadow 0.25s ease, -webkit-backdrop-filter 0.25s;
      backdrop-filter: blur(0px);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .header-scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    
    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 18px;
    }
    
    .logo-text {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 24px;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    
    .nav-cta {
      background: var(--amber);
      color: #0B1E3C;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      transition: filter 0.2s;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }
    
    .nav-cta:hover{
      filter: brightness(1.08);
      color: #0B1E3C;
    }
    
    /* 移动底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.02);
      z-index: 1100;
      height: var(--mobile-nav-height);
      padding: 6px 16px 8px;
      justify-content: space-between;
      align-items: center;
      border-top: 1px solid #F0F1F4;
    }
    
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      font-size: 11px;
      color: var(--text-muted);
      background: transparent;
      border: none;
      padding: 6px 12px;
      border-radius: 30px;
      font-weight: 500;
      cursor: pointer;
      transition: 0.15s;
    }
    
    .mobile-tab.active {
      background: var(--primary);
      color: white;
      font-weight: 600;
    }
    
    .mobile-icon {
      font-size: 20px;
    }
    
    /* Hero */
    .hero-section {
      padding-top: calc(var(--header-height) + 20px);
      background: linear-gradient(180deg, #FAFBFD 0%, #EEF3FC 100%);
      position: relative;
      overflow: hidden;
      min-height: 620px;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    
    .hero-left {
      flex: 0 0 55%;
      padding-bottom: 40px;
    }
    
    .hero-h1 {
      font-family: var(--font-title);
      font-size: 48px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.2;
      letter-spacing: -0.6px;
      margin-bottom: 24px;
    }
    
    .hero-desc {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
    }
    
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    
    .btn-primary {
      background: var(--amber);
      color: var(--deep-anchor);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 17px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      transition: filter 0.2s, transform 0.1s;
      line-height: 1.2;
    }
    
    .btn-primary:hover {
      filter: brightness(1.1);
    }
    
    .btn-primary:active {
      transform: translateY(2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: white;
      transition: 0.2s;
    }
    
    .btn-outline:hover {
      background: #EEF4FF;
      border-color: var(--deep-anchor);
    }
    
    .hero-right {
      flex: 0 0 45%;
      display: flex;
      justify-content: flex-end;
    }
    
    .stats-panel {
      display: flex;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 20px 30px;
      gap: 24px;
      box-shadow: 0 10px 30px rgba(26,95,220,0.08);
      background: var(--card-bg);
      flex-wrap: wrap;
    }
    
    .stat-item {
      text-align: left;
      padding: 8px 0;
      position: relative;
      flex: 1;
    }
    
    .stat-item:not(:last-child)::after {
      content: '';
      position: absolute;
      right: -16px;
      top: 6px;
      height: 48px;
      width: 1px;
      background: var(--border-heavy);
    }
    
    .stat-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--amber);
      letter-spacing: -1px;
      display: block;
      margin-bottom: 4px;
      white-space: nowrap;
    }
    
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 400;
    }
    
    .section {
      padding: 100px 0;
    }
    
    .section-bg {
      background: #F4F7FC;
      border-radius: 0;
    }
    
    .h2 {
      font-family: var(--font-title);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 60px;
      letter-spacing: -0.5px;
    }
    
    .center {
      text-align: center;
    }
    
    /* 核心优势三列分隔 */
    .feature-row {
      display: flex;
      gap: 20px;
      justify-content: center;
    }
    
    .feature-item {
      flex: 1;
      text-align: center;
      padding: 28px 16px;
      position: relative;
    }
    
    .feature-item:not(:last-child) {
      border-right: 1px solid #DCE2EF;
    }
    
    .feature-icon {
      font-size: 48px;
      color: var(--primary);
      margin-bottom: 18px;
    }
    
    .feature-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 14px;
    }
    
    /* 服务卡片网格 2x3 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .card-img {
      height: 180px;
      background: #E9EEF6;
      object-fit: cover;
      width: 100%;
    }
    
    .card-body {
      padding: 24px 28px 20px;
    }
    
    .card-body h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    
    .card-body p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 18px;
    }
    
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    
    .arrow-move:hover {
      transform: translateX(4px);
      transition: 0.2s;
      display: inline-block;
    }
    
    /* 对比表 */
    .compare-dual {
      display: flex;
      gap: 24px;
    }
    
    .compare-col {
      flex: 1;
      background: white;
      border-radius: 16px;
      padding: 32px;
      border: 1px solid var(--border-light);
    }
    
    .vs-divider {
      display: none;
    }
    
    .compare-title {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 24px;
    }
    
    .metric-row {
      display: flex;
      flex-direction: column;
      margin-bottom: 22px;
    }
    
    .metric-label {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    
    .metric-value {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      display: flex;
      align-items: baseline;
      gap: 10px;
      flex-wrap: wrap;
    }
    
    .badge {
      background: var(--amber);
      color: var(--deep-anchor);
      font-size: 13px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
    }
    
    .metric-gray {
      color: var(--text-secondary);
    }
    
    .metric-highlight {
      color: var(--primary);
    }
    
    /* 流程 */
    .steps-line {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    
    .step {
      text-align: center;
      flex:1;
    }
    
    .step-circle {
      width:48px; height:48px; background:var(--primary); color:white; border-radius:50%; display:flex; align-items:center; justify-content:center; margin:0 auto 18px; font-size:18px; font-weight:700;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    
    .faq-question {
      background: transparent;
      border: none;
      padding: 22px 0;
      font-size: 18px;
      font-weight: 600;
      width: 100%;
      text-align: left;
      display: flex;
      align-items: center;
      gap: 14px;
      cursor: pointer;
      color: var(--text-main);
    }
    
    .q-mark {
      background: var(--primary);
      color: white;
      border-radius: 50%;
      width: 28px;
      height: 28px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 20px 0 44px;
      color: var(--text-secondary);
      font-size: 16px;
    }
    
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }
    
    .dark-cta {
      background: var(--dark-bg);
      color: white;
    }
    
    .cta-split {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    
    .form-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      color: var(--text-main);
      width: 420px;
      max-width: 100%;
    }
    
    .form-card input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-heavy);
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      transition: 0.2s;
    }
    
    .form-card input:focus {
      border-color: var(--primary);
    }
    
    footer {
      background: #1A1F2E;
      color: #8E95A9;
      padding: 64px 0 32px;
    }
    
    @media (max-width:1024px){
      .hero-h1{font-size:40px;}
    }
    
    @media (max-width:768px){
      .container{padding:0 24px;}
      .main-header{display:none;}
      .mobile-bottom-nav{display:flex;}
      body{padding-bottom:var(--mobile-nav-height);}
      .hero-grid{flex-direction:column; align-items:flex-start;}
      .hero-right{width:100%;}
      .stats-panel{flex-direction:column; width:100%;}
      .service-grid{grid-template-columns:1fr;}
      .feature-row{flex-direction:column; border-right:none;}
      .feature-item:not(:last-child){border-right:none;border-bottom:1px solid #ddd;}
      .compare-dual{flex-direction:column;}
      .section{padding:64px 0;}
    }