/* roulang page: index */
:root {
      --bg-dark: #0B0F19;
      --bg-dark-card: #131A2A;
      --bg-light: #F8FAFC;
      --bg-light-alt: #F1F5F9;
      --accent-green: #00F2A5;
      --accent-purple: #6366F1;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #F8FAFC;
      --text-light-muted: #94A3B8;
      --border-light: rgba(226, 232, 240, 0.9);
      --border-dark: rgba(255, 255, 255, 0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 30px -5px rgba(0, 0, 0, 0.08);
      --shadow-glow: 0 0 35px rgba(0, 242, 165, 0.25);
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-family: var(--font-stack); }
    body { background-color: var(--bg-light); color: var(--text-main); line-height: 1.6; overflow-x: hidden; }
    a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; }
    .container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
    .top-bar { background: #060911; color: var(--text-light-muted); font-size: 13px; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
    .top-bar-inner { display: flex; justify-content: space-between; align-items: center; }
    .top-bar-tags span { margin-right: 18px; display: inline-flex; align-items: center; }
    .top-bar-tags span::before { content: ""; display: inline-block; width: 6px; height: 6px; background: var(--accent-green); border-radius: 50%; margin-right: 6px; }
    header.main-header { position: sticky; top: 0; z-index: 1000; background: rgba(11, 15, 25, 0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-dark); }
    .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .brand-logo { font-size: 20px; font-weight: 700; color: #FFFFFF; display: flex; align-items: center; gap: 10px; }
    .brand-logo-badge { width: 34px; height: 34px; background: linear-gradient(135deg, var(--accent-green), var(--accent-purple)); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #0B0F19; font-weight: 900; font-size: 16px; }
    .nav-menu { display: flex; gap: 24px; align-items: center; }
    .nav-link { color: var(--text-light-muted); font-size: 15px; font-weight: 500; }
    .nav-link:hover { color: var(--accent-green); }
    .header-cta-btn { background: linear-gradient(135deg, var(--accent-green), #00c988); color: #060911; padding: 9px 20px; border-radius: 9999px; font-weight: 600; font-size: 14px; box-shadow: 0 4px 15px rgba(0, 242, 165, 0.3); }
    .header-cta-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0, 242, 165, 0.5); }
    .section-py { padding: 88px 0; }
    .section-py-sm { padding: 60px 0; }
    .bg-light-alt { background-color: var(--bg-light-alt); }
    .bg-dark-section { background-color: var(--bg-dark); color: var(--text-light); }
    .section-header { text-align: center; max-width: 800px; margin: 0 auto 52px; }
    .section-tag { display: inline-block; padding: 4px 14px; border-radius: 9999px; font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 14px; background: rgba(99, 102, 241, 0.1); color: var(--accent-purple); }
    .bg-dark-section .section-tag { background: rgba(0, 242, 165, 0.12); color: var(--accent-green); }
    .section-title { font-size: 32px; font-weight: 800; line-height: 1.3; margin-bottom: 16px; color: var(--text-main); }
    .bg-dark-section .section-title { color: #FFFFFF; }
    .section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.7; }
    .bg-dark-section .section-desc { color: var(--text-light-muted); }
    .hero-section { position: relative; background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.25), transparent 50%), radial-gradient(circle at 20% 80%, rgba(0, 242, 165, 0.15), transparent 40%), #0B0F19; color: #FFFFFF; padding: 90px 0 100px; overflow: hidden; }
    .hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; }
    .hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255, 255, 255, 0.08); border: 1px solid var(--border-dark); padding: 6px 16px; border-radius: 9999px; font-size: 14px; margin-bottom: 24px; color: var(--accent-green); }
    .hero-title { font-size: 44px; font-weight: 800; line-height: 1.25; margin-bottom: 22px; letter-spacing: -0.5px; }
    .hero-title span { background: linear-gradient(135deg, var(--accent-green), #6366f1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    .hero-desc { font-size: 16px; color: var(--text-light-muted); line-height: 1.8; margin-bottom: 36px; }
    .hero-form-card { background: rgba(19, 26, 42, 0.85); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: var(--radius-lg); padding: 32px; backdrop-filter: blur(16px); box-shadow: var(--shadow-glow); }
    .hero-form-title { font-size: 20px; font-weight: 700; margin-bottom: 12px; color: #FFFFFF; }
    .hero-form-sub { font-size: 13px; color: var(--text-light-muted); margin-bottom: 24px; }
    .hero-form-group { margin-bottom: 16px; }
    .hero-form-group label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: #E2E8F0; }
    .hero-input { width: 100%; padding: 12px 16px; background: rgba(11, 15, 25, 0.7); border: 1px solid var(--border-dark); border-radius: var(--radius-sm); color: #FFF; font-size: 14px; outline: none; transition: border-color 0.2s; }
    .hero-input:focus { border-color: var(--accent-green); box-shadow: 0 0 0 2px rgba(0,242,165,0.2); }
    .hero-submit-btn { width: 100%; padding: 13px; background: linear-gradient(135deg, var(--accent-green), #00c988); border: none; border-radius: var(--radius-sm); color: #060911; font-size: 15px; font-weight: 700; cursor: pointer; transition: all 0.2s ease; margin-top: 8px; }
    .hero-submit-btn:hover { opacity: 0.95; transform: translateY(-1px); }
    .card-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .card-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .feature-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 32px; transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1); box-shadow: var(--shadow-sm); }
    .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(99, 102, 241, 0.4); }
    .feature-icon-box { width: 50px; height: 50px; background: rgba(99, 102, 241, 0.08); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 20px; color: var(--accent-purple); }
    .feature-card-title { font-size: 19px; font-weight: 700; margin-bottom: 12px; color: var(--text-main); }
    .feature-card-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
    .feature-meta-tag { display: inline-block; font-size: 12px; font-weight: 600; padding: 3px 10px; background: var(--bg-light-alt); color: var(--accent-purple); border-radius: 4px; }
    .scenario-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; transition: all 0.3s; }
    .scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .scenario-card-img { height: 180px; width: 100%; object-fit: cover; }
    .scenario-card-body { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; }
    .scenario-name { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
    .scenario-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 18px; flex-grow: 1; }
    .scenario-kpi { border-top: 1px dashed var(--border-light); padding-top: 12px; display: flex; justify-content: space-between; font-size: 13px; font-weight: 600; color: var(--accent-purple); }
    .step-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
    .step-item { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 28px 24px; position: relative; }
    .step-number { font-size: 32px; font-weight: 900; color: rgba(99, 102, 241, 0.2); line-height: 1; margin-bottom: 12px; }
    .step-item-title { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
    .step-item-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; }
    .demo-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
    .demo-showcase-img { border-radius: var(--radius-md); border: 1px solid var(--border-dark); box-shadow: 0 20px 40px rgba(0,0,0,0.3); }
    .pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .pricing-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: 36px 28px; position: relative; transition: all 0.3s; }
    .pricing-card.featured { border-color: var(--accent-purple); box-shadow: 0 10px 30px rgba(99, 102, 241, 0.15); }
    .pricing-badge { position: absolute; top: -14px; right: 28px; background: var(--accent-purple); color: #FFF; font-size: 12px; font-weight: 700; padding: 3px 12px; border-radius: 9999px; }
    .pricing-tier { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
    .pricing-scope { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
    .pricing-list { margin-bottom: 30px; font-size: 14px; color: #334155; }
    .pricing-list li { padding: 7px 0; border-bottom: 1px solid #F1F5F9; display: flex; align-items: center; }
    .pricing-list li::before { content: "✓"; color: #10B981; font-weight: 900; margin-right: 10px; }
    .btn-pricing { display: block; text-align: center; padding: 11px 0; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; background: var(--bg-light-alt); color: var(--text-main); border: 1px solid var(--border-light); }
    .btn-pricing:hover { background: var(--accent-purple); color: #FFF; border-color: var(--accent-purple); }
    .btn-pricing-featured { background: var(--accent-purple); color: #FFF; border-color: var(--accent-purple); }
    .btn-pricing-featured:hover { background: #4F46E5; }
    .stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
    .stat-item { padding: 28px; background: rgba(255, 255, 255, 0.04); border: 1px solid var(--border-dark); border-radius: var(--radius-md); }
    .stat-val { font-size: 38px; font-weight: 800; color: var(--accent-green); line-height: 1; margin-bottom: 10px; font-family: monospace; }
    .stat-label { font-size: 14px; color: var(--text-light-muted); }
    .testimonial-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 30px; }
    .t-quote { font-size: 14px; color: #334155; line-height: 1.7; margin-bottom: 20px; font-style: italic; }
    .t-author { display: flex; align-items: center; gap: 14px; }
    .t-avatar { width: 44px; height: 44px; border-radius: 50%; background: #E2E8F0; display: flex; align-items: center; justify-content: center; font-weight: 700; color: #475569; font-size: 14px; }
    .t-info-name { font-size: 15px; font-weight: 700; color: var(--text-main); }
    .t-info-title { font-size: 12px; color: var(--text-muted); }
    .news-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; }
    .news-card-body { padding: 24px; display: flex; flex-direction: column; flex-grow: 1; }
    .news-date { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
    .news-card-title { font-size: 17px; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }
    .news-card-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex-grow: 1; }
    .news-action { font-size: 13px; font-weight: 600; color: var(--accent-purple); }
    .partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; text-align: center; }
    .partner-badge { padding: 18px 12px; background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border-dark); border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; color: var(--text-light-muted); transition: all 0.2s; }
    .partner-badge:hover { color: var(--accent-green); border-color: rgba(0, 242, 165, 0.4); background: rgba(0, 242, 165, 0.04); }
    .accordion-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
    .accordion-item { border: 1px solid var(--border-light); border-radius: var(--radius-sm); background: #FFFFFF; overflow: hidden; }
    .accordion-header { padding: 18px 24px; font-size: 16px; font-weight: 700; cursor: pointer; display: flex; justify-content: space-between; align-items: center; user-select: none; background: #FFFFFF; }
    .accordion-header:hover { color: var(--accent-purple); }
    .accordion-content { padding: 0 24px 20px; font-size: 14px; color: var(--text-muted); line-height: 1.7; display: none; }
    .accordion-item.active .accordion-content { display: block; }
    .accordion-item.active .accordion-header { color: var(--accent-purple); border-bottom: 1px solid #F1F5F9; }
    .accordion-arrow { transition: transform 0.25s; font-size: 12px; }
    .accordion-item.active .accordion-arrow { transform: rotate(180deg); }
    .guarantee-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .guarantee-box { display: flex; align-items: center; gap: 14px; padding: 20px; background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-sm); }
    .guarantee-icon { font-size: 24px; color: #10B981; }
    .guarantee-title { font-size: 15px; font-weight: 700; margin-bottom: 2px; }
    .guarantee-desc { font-size: 12px; color: var(--text-muted); }
    .cta-card-box { background: radial-gradient(circle at 50% 50%, #1A2338, #0B0F19); border: 1px solid rgba(0, 242, 165, 0.3); border-radius: var(--radius-lg); padding: 60px 40px; text-align: center; color: #FFF; box-shadow: var(--shadow-glow); }
    .cta-title { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
    .cta-desc { font-size: 16px; color: var(--text-light-muted); max-width: 640px; margin: 0 auto 32px; }
    .cta-btn-group { display: flex; justify-content: center; gap: 16px; }
    .btn-cta-primary { background: linear-gradient(135deg, var(--accent-green), #00c988); color: #0B0F19; padding: 14px 34px; border-radius: 9999px; font-weight: 700; font-size: 15px; }
    .btn-cta-secondary { background: rgba(255, 255, 255, 0.1); color: #FFFFFF; padding: 14px 30px; border-radius: 9999px; font-weight: 600; font-size: 15px; border: 1px solid var(--border-dark); }
    footer.main-footer { background: #060911; color: var(--text-light-muted); padding: 70px 0 30px; border-top: 1px solid rgba(255, 255, 255, 0.08); font-size: 14px; }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 50px; }
    .footer-col-title { font-size: 16px; font-weight: 700; color: #FFFFFF; margin-bottom: 20px; }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a:hover { color: var(--accent-green); }
    .footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.06); padding-top: 28px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: #64748B; }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .card-grid-3, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
      .step-list, .stats-strip, .card-grid-4, .guarantee-grid { grid-template-columns: repeat(2, 1fr); }
      .partner-grid { grid-template-columns: repeat(3, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .demo-showcase { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu { display: none; }
      .hero-title { font-size: 30px; }
      .section-title { font-size: 24px; }
      .card-grid-3, .pricing-grid, .step-list, .stats-strip, .card-grid-4, .guarantee-grid, .partner-grid, .footer-grid { grid-template-columns: 1fr; }
      .cta-btn-group { flex-direction: column; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    }