/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #E84A2D;
      --primary-hover: #C73A1F;
      --gold: #FFB800;
      --dark: #0F1419;
      --light-bg: #F7F3EE;
      --text-dark: #1A1A1A;
      --text-gray: #5C5C5C;
      --success: #00A86B;
      --white: #FFFFFF;
      --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
      --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
      --radius: 6px;
      --transition: 0.2s ease;
      --border-light: #E5E0DA;
      --border-dark: rgba(255, 255, 255, 0.08);
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-data: "DIN Alternate", "Arial", sans-serif;
    }

    /* ----- 重置与基础 ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ----- 标题字体公用 ----- */
    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      color: #fff;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 16px;
      text-align: center;
      color: var(--text-dark);
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-dark);
    }

    /* ----- 导航（桌面） ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(15, 20, 25, 0.95);
      backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: box-shadow 0.3s ease;
    }

    .navbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
      border-bottom-color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: #fff !important;
      padding: 10px 28px !important;
      border-radius: var(--radius);
      font-weight: 600;
      border: none !important;
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      color: #fff !important;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #fff;
      border-top: 2px solid var(--border-light);
      z-index: 1001;
      justify-content: space-around;
      align-items: center;
      padding: 8px 12px 12px;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.05);
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: var(--text-gray);
      font-weight: 500;
      gap: 4px;
    }

    .mobile-nav .download-btn {
      background: var(--primary);
      color: #fff;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -20px;
      box-shadow: 0 6px 16px rgba(232,74,45,0.5);
      font-size: 20px;
    }

    /* ----- Hero 首屏 ----- */
    #hero {
      background-color: var(--dark);
      color: #fff;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-pattern {
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(45deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 4px, transparent 4px, transparent 12px);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-text h1 {
      margin-bottom: 20px;
      letter-spacing: 1px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      font-size: 18px;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius);
      box-shadow: 0 6px 20px rgba(232,74,45,0.4);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 10px 24px rgba(232,74,45,0.6);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: #fff;
      background: transparent;
      padding: 16px 36px;
      border-radius: var(--radius);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
    }

    .hero-mockup {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-mockup img {
      max-height: 520px;
      border-radius: 24px;
      box-shadow: 0 30px 60px rgba(0,0,0,0.5);
      transform: rotate(3deg);
    }

    /* ----- 通用区块间距 ----- */
    section {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-header p {
      color: var(--text-gray);
      max-width: 640px;
      margin: 0 auto;
    }

    /* ----- 功能卡片网格 ----- */
    #features {
      background-color: var(--light-bg);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 40px;
    }

    .feature-card {
      background: #fff;
      padding: 32px 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }

    .feature-icon {
      width: 56px;
      height: 56px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 26px;
      color: #fff;
    }

    .feature-card h3 {
      font-size: 22px;
    }

    .feature-card p {
      color: var(--text-gray);
      font-size: 15px;
    }

    .text-center {
      text-align: center;
    }

    .btn-link {
      color: var(--primary);
      font-weight: 600;
      border-bottom: 1px solid transparent;
    }

    .btn-link:hover {
      border-bottom-color: var(--primary);
    }

    /* ----- 场景卡片横向 ----- */
    #scenarios {
      background: #fff;
    }

    .scenarios-grid {
      display: flex;
      flex-direction: column;
      gap: 24px;
      max-width: 960px;
      margin: 0 auto;
    }

    .scenario-card {
      display: flex;
      background: var(--light-bg);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }

    .scenario-card:hover {
      box-shadow: var(--card-shadow-hover);
    }

    .scenario-img {
      flex: 1;
      min-height: 220px;
      background-size: cover;
      background-position: center;
    }

    .scenario-text {
      flex: 1;
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .scenario-text h3 {
      margin-bottom: 12px;
    }

    /* ----- 案例与数据 ----- */
    #cases {
      background: var(--dark);
      color: #fff;
    }

    #cases h2 {
      color: #fff;
    }

    .stats-row {
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-data);
      font-size: 48px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.2;
    }

    .stat-label {
      color: rgba(255,255,255,0.6);
      font-size: 14px;
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-dark);
      padding: 28px;
      border-radius: var(--radius);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .case-avatar {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border-radius: 50%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
    }

    .case-quote {
      font-style: italic;
      color: rgba(255,255,255,0.8);
    }

    /* ----- 价格卡片 ----- */
    #pricing {
      background: #fff;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }

    .pricing-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--card-shadow);
      position: relative;
      transition: var(--transition);
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 10px 30px rgba(232,74,45,0.15);
    }

    .badge {
      background: var(--gold);
      color: #000;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      display: inline-block;
      margin-bottom: 12px;
    }

    .price {
      font-family: var(--font-data);
      font-size: 42px;
      font-weight: 700;
      margin: 12px 0;
    }

    .feature-list {
      list-style: none;
      margin: 20px 0;
    }

    .feature-list li {
      padding: 6px 0;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-gray);
    }

    .btn-block {
      width: 100%;
      justify-content: center;
      padding: 14px;
      border-radius: var(--radius);
      font-weight: 700;
    }

    /* ----- FAQ 手风琴 ----- */
    #faq {
      background: var(--light-bg);
    }

    .faq-list {
      max-width: 768px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #fff;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      width: 100%;
      font-size: 17px;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-gray);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* ----- CTA 区域 ----- */
    #cta {
      background: var(--primary);
      color: #fff;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    #cta::before {
      content: '';
      position: absolute;
      inset: 0;
      background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    }

    #cta .container {
      position: relative;
      z-index: 2;
    }

    #cta h2 {
      color: #fff;
    }

    .btn-light {
      background: #fff;
      color: var(--primary);
      font-weight: 700;
      padding: 18px 48px;
      border-radius: var(--radius);
      font-size: 18px;
      margin-top: 24px;
    }

    /* ----- 页脚 ----- */
    #footer {
      background: var(--dark);
      color: rgba(255,255,255,0.7);
      padding: 48px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }

    .footer-col h4 {
      color: #fff;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      color: rgba(255,255,255,0.6);
      margin-bottom: 8px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-mockup img {
        max-height: 360px;
      }
      .features-grid, .cases-grid, .pricing-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .navbar {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .features-grid, .cases-grid, .pricing-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .scenario-card {
        flex-direction: column;
      }
      .stats-row {
        gap: 24px;
      }
    }