/* roulang page: index */
:root {
      --primary: #4F46E5;
      --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
      --accent: #06B6D4;
      --accent-green: #10B981;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0F172A;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --text-white: #F8FAFC;
      --border-color: rgba(226, 232, 240, 0.9);
      --card-radius: 18px;
      --btn-radius: 10px;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(79, 70, 229, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.15);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-muted);
      line-height: 1.6;
      max-width: 100%;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-topbar {
      background: #F1F5F9;
      font-size: 13px;
      color: var(--text-light);
      padding: 6px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .header-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 20px;
      color: var(--text-main);
    }
    .nav-logo-badge {
      background: var(--primary-gradient);
      color: #fff;
      font-size: 11px;
      padding: 3px 8px;
      border-radius: 6px;
      font-weight: 600;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-muted);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 15px;
      padding: 12px 24px;
      border-radius: var(--btn-radius);
      transition: var(--transition);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #fff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      color: #fff;
    }
    .btn-secondary {
      background: #FFFFFF;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }
    .btn-secondary:hover {
      background: #F8FAFC;
      border-color: #CBD5E1;
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
    }
    .btn-accent:hover {
      background: #0891B2;
      transform: translateY(-2px);
    }
    section {
      padding: 72px 0;
      position: relative;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      padding: 6px 14px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-light);
      line-height: 1.7;
    }
    .hero-section {
      position: relative;
      padding: 90px 0 80px;
      background: linear-gradient(180deg, #F8FAFC 0%, #EEF2FF 100%);
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.jpg');
      background-size: cover;
      background-position: center;
      opacity: 0.07;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-content h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-content p {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.75;
    }
    .hero-meta-strip {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 28px;
      flex-wrap: wrap;
    }
    .badge-chip {
      background: #FFFFFF;
      padding: 8px 14px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-group-box {
      background: #FFFFFF;
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .group-counter-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      border-bottom: 1px dashed var(--border-color);
      padding-bottom: 16px;
    }
    .counter-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
    }
    .progress-bar {
      height: 8px;
      background: #E2E8F0;
      border-radius: 4px;
      overflow: hidden;
      margin-bottom: 20px;
    }
    .progress-fill {
      width: 78%;
      height: 100%;
      background: var(--primary-gradient);
    }
    .group-avatar-stack {
      display: flex;
      align-items: center;
      margin-bottom: 20px;
      gap: 10px;
    }
    .avatar-circles {
      display: flex;
    }
    .avatar-circle {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: #6366F1;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
      border: 2px solid #FFFFFF;
      margin-left: -8px;
    }
    .avatar-circle:first-child {
      margin-left: 0;
    }
    .countdown-bar {
      background: #0F172A;
      color: #fff;
      padding: 24px 0;
    }
    .countdown-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }
    .countdown-timer {
      display: flex;
      gap: 12px;
      align-items: center;
    }
    .time-slot {
      background: rgba(255, 255, 255, 0.1);
      padding: 8px 14px;
      border-radius: 8px;
      text-align: center;
      min-width: 60px;
    }
    .time-slot .num {
      font-size: 20px;
      font-weight: 800;
      color: var(--accent);
      display: block;
    }
    .time-slot .unit {
      font-size: 11px;
      color: #94A3B8;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 32px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(79, 70, 229, 0.3);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: 800;
    }
    .card-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .card-text {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .pricing-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 36px;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 16px 36px rgba(79, 70, 229, 0.12);
      transform: scale(1.03);
    }
    .featured-ribbon {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--primary-gradient);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
    }
    .price-value {
      font-size: 38px;
      font-weight: 800;
      color: var(--text-main);
      margin: 18px 0;
    }
    .price-value small {
      font-size: 14px;
      color: var(--text-light);
      font-weight: 500;
    }
    .feature-list {
      list-style: none;
      margin: 24px 0 32px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      margin-bottom: 12px;
      color: var(--text-muted);
    }
    .feature-list li::before {
      content: "✓";
      color: var(--accent-green);
      font-weight: 800;
    }
    .step-node {
      position: relative;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 30px;
    }
    .step-badge {
      display: inline-block;
      width: 34px;
      height: 34px;
      line-height: 34px;
      text-align: center;
      background: var(--primary-gradient);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      margin-bottom: 16px;
    }
    .dark-section {
      background: var(--bg-dark);
      color: var(--text-white);
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .dark-card {
      background: rgba(30, 41, 59, 0.7);
      border: 1px solid rgba(51, 65, 85, 0.8);
      border-radius: var(--card-radius);
      padding: 28px;
    }
    .dark-card h3 {
      color: #F8FAFC;
      margin-bottom: 10px;
      font-size: 18px;
    }
    .dark-card p {
      color: #94A3B8;
      font-size: 14px;
      line-height: 1.6;
    }
    .stat-strip {
      background: linear-gradient(135deg, #1E1B4B 0%, #312E81 100%);
      color: #fff;
      padding: 60px 0;
    }
    .stat-number {
      font-size: 40px;
      font-weight: 900;
      color: var(--accent);
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 14px;
      color: #CBD5E1;
    }
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-stars {
      color: #F59E0B;
      margin-bottom: 12px;
      font-size: 16px;
    }
    .author-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #CBD5E1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #334155;
    }
    .news-card {
      background: #FFFFFF;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-card-body {
      padding: 24px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .accordion-summary {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 17px;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
    }
    .cta-banner {
      background: var(--primary-gradient);
      border-radius: 24px;
      padding: 56px 40px;
      color: #FFFFFF;
      text-align: center;
      box-shadow: 0 20px 40px rgba(79, 70, 229, 0.25);
    }
    .cta-banner h2 {
      font-size: 36px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .cta-banner p {
      max-width: 680px;
      margin: 0 auto 32px;
      font-size: 16px;
      color: #E0E7FF;
      line-height: 1.7;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 520px;
      margin: 0 auto;
      flex-wrap: wrap;
    }
    .cta-input {
      flex: 1;
      min-width: 240px;
      padding: 14px 18px;
      border-radius: var(--btn-radius);
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.15);
      color: #fff;
      font-size: 15px;
      outline: none;
    }
    .cta-input::placeholder {
      color: #CBD5E1;
    }
    .cta-input:focus {
      background: #FFFFFF;
      color: var(--text-main);
    }
    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 64px 0 28px;
      font-size: 14px;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr repeat(3, 1fr);
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: #F8FAFC;
      font-size: 16px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .header-topbar {
        display: none;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .pricing-card.featured {
        transform: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .countdown-flex {
        flex-direction: column;
        align-items: flex-start;
      }
    }