/* roulang page: index */
:root {
      --color-primary: #0D5BFF;
      --color-primary-hover: #0046DB;
      --color-dark: #0B0F17;
      --color-dark-alt: #131A26;
      --color-text-main: #0F172A;
      --color-text-muted: #475569;
      --color-text-light: #94A3B8;
      --color-bg-base: #FFFFFF;
      --color-bg-subtle: #F8FAFC;
      --color-border: rgba(226, 232, 240, 0.9);
      --color-signal: #00B578;
      --color-amber: #D97706;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: var(--font-stack); color: var(--color-text-main); background-color: var(--color-bg-base); line-height: 1.75; overflow-x: hidden; }
    a { color: inherit; text-decoration: none; transition: all 0.2s ease; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font-family: inherit; }
    .container { width: 100%; max-width: 1280px; margin-left: auto; margin-right: auto; padding-left: 1.5rem; padding-right: 1.5rem; }
    .section-sp { padding-top: 5.5rem; padding-bottom: 5.5rem; }
    .section-title-wrap { margin-bottom: 3.5rem; text-align: left; }
    .badge-tag { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0.85rem; border-radius: 9999px; font-size: 0.825rem; font-weight: 600; letter-spacing: 0.02em; background-color: rgba(13, 91, 255, 0.1); color: var(--color-primary); margin-bottom: 1rem; }
    .section-h2 { font-size: 2.15rem; font-weight: 800; color: #0F172A; line-height: 1.25; margin-bottom: 1rem; letter-spacing: -0.01em; }
    .section-desc { font-size: 1.05rem; color: var(--color-text-muted); max-width: 820px; line-height: 1.8; }
    .btn-solid { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; background-color: var(--color-primary); color: #FFF; font-weight: 600; font-size: 0.95rem; padding: 0.85rem 1.85rem; border-radius: var(--radius-sm); border: none; cursor: pointer; transition: background-color 0.2s, transform 0.15s; }
    .btn-solid:hover { background-color: var(--color-primary-hover); transform: translateY(-2px); }
    .btn-outline { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; background-color: transparent; color: var(--color-text-main); font-weight: 600; font-size: 0.95rem; padding: 0.85rem 1.85rem; border-radius: var(--radius-sm); border: 1px solid #CBD5E1; cursor: pointer; }
    .btn-outline:hover { background-color: #F1F5F9; border-color: #94A3B8; }
    
    /* Top Bar */
    .top-bar { background-color: var(--color-dark); color: #94A3B8; font-size: 0.825rem; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.08); }
    .top-bar-inner { display: flex; justify-content: space-between; align-items: center; }
    .top-bar-item { display: flex; align-items: center; gap: 0.5rem; }
    .status-dot { width: 8px; height: 8px; border-radius: 50%; background-color: var(--color-signal); display: inline-block; box-shadow: 0 0 8px var(--color-signal); }

    /* Header Nav */
    .site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.94); backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .logo-box { display: flex; align-items: center; gap: 0.75rem; font-weight: 800; font-size: 1.25rem; color: #0F172A; }
    .logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, #0D5BFF 0%, #002EA6 100%); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 900; font-size: 1rem; }
    .nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
    .nav-links a { font-size: 0.95rem; font-weight: 600; color: #334155; }
    .nav-links a:hover { color: var(--color-primary); }
    .mobile-menu-btn { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: #334155; }

    /* Hero */
    .hero-section { position: relative; background: radial-gradient(circle at 85% 15%, rgba(13,91,255,0.12), transparent 45%), linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%); padding: 5rem 0 6rem 0; border-bottom: 1px solid var(--color-border); }
    .hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3.5rem; align-items: center; }
    .hero-h1 { font-size: 3rem; font-weight: 900; line-height: 1.18; color: #0B0F17; margin-bottom: 1.5rem; letter-spacing: -0.02em; }
    .hero-p { font-size: 1.125rem; line-height: 1.8; color: var(--color-text-muted); margin-bottom: 2rem; }
    .hero-book-card { background: #FFFFFF; border-radius: var(--radius-lg); border: 1px solid #E2E8F0; box-shadow: var(--shadow-lg); padding: 2.25rem; position: relative; }
    .doc-meta-badge { font-size: 0.75rem; text-transform: uppercase; background: #EEF2F6; color: #475569; padding: 0.25rem 0.6rem; border-radius: 4px; font-weight: 700; margin-bottom: 0.75rem; display: inline-block; }
    .download-form { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 0.85rem; }
    .form-input { width: 100%; padding: 0.75rem 1rem; border: 1px solid #CBD5E1; border-radius: var(--radius-sm); font-size: 0.9rem; background: #F8FAFC; outline: none; }
    .form-input:focus { border-color: var(--color-primary); background: #FFF; }

    /* Pain Points */
    .grid-pain { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
    .pain-card { background: #FFFFFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.75rem; position: relative; border-top: 3px solid #EF4444; }
    .pain-num { font-size: 1.5rem; font-weight: 800; color: #DC2626; margin-bottom: 0.75rem; }
    .pain-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; color: #1E293B; }
    .pain-desc { font-size: 0.9rem; color: #64748B; line-height: 1.65; }

    /* Architecture Section */
    .arch-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
    .arch-layer-item { display: flex; gap: 1.25rem; margin-bottom: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px dashed #E2E8F0; }
    .arch-layer-num { width: 32px; height: 32px; background: #0D5BFF; color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }

    /* Feature Grid (6 Cards) */
    .grid-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .feature-card { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 2.25rem 1.75rem; transition: transform 0.2s, box-shadow 0.2s; position: relative; }
    .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: #CBD5E1; }
    .feature-icon-bar { width: 44px; height: 44px; border-radius: 8px; background: #EFF6FF; color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-weight: 800; margin-bottom: 1.25rem; font-size: 1.1rem; }
    .feature-spec { margin-top: 1rem; font-size: 0.8rem; font-weight: 700; color: #0284C7; background: #F0F9FF; display: inline-block; padding: 0.2rem 0.6rem; border-radius: 4px; }

    /* Shift Schedule / Worktime Cards */
    .time-slot-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
    .time-card { background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%); color: #FFF; border-radius: var(--radius-md); padding: 2rem; border-left: 4px solid var(--color-signal); }
    .time-badge { font-size: 0.75rem; background: rgba(0, 181, 120, 0.2); color: #34D399; padding: 0.2rem 0.6rem; border-radius: 4px; display: inline-block; margin-bottom: 0.85rem; font-weight: 700; }

    /* Products Matrix */
    .product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .product-card { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow 0.2s; }
    .product-card:hover { box-shadow: var(--shadow-md); }
    .product-img-box { height: 230px; background-color: #E2E8F0; overflow: hidden; position: relative; }
    .product-img-box img { width: 100%; height: 100%; object-fit: cover; }
    .product-body { padding: 1.75rem; flex: 1; display: flex; flex-direction: column; }
    .product-model { font-size: 0.8rem; font-weight: 700; color: var(--color-primary); margin-bottom: 0.35rem; }
    .param-list { list-style: none; margin: 1.25rem 0; font-size: 0.875rem; color: #475569; display: flex; flex-direction: column; gap: 0.4rem; }
    .param-list li { display: flex; justify-content: space-between; border-bottom: 1px dotted #E2E8F0; padding-bottom: 0.25rem; }

    /* Workflow Steps */
    .step-flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; position: relative; }
    .step-box { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 2rem 1.5rem; position: relative; }
    .step-index { font-size: 2.25rem; font-weight: 900; color: #E2E8F0; line-height: 1; margin-bottom: 0.75rem; }

    /* Deep Case Section */
    .dark-section { background-color: var(--color-dark); color: #F1F5F9; }
    .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
    .case-panel { background: var(--color-dark-alt); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-md); overflow: hidden; }
    .case-img-wrap { height: 240px; position: relative; }
    .case-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
    .case-content { padding: 2rem; }

    /* Team Section */
    .team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
    .team-card { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.5rem; text-align: center; }
    .team-avatar { width: 88px; height: 88px; border-radius: 50%; margin: 0 auto 1.25rem; overflow: hidden; background: #E2E8F0; }
    .team-avatar img { width: 100%; height: 100%; object-fit: cover; }

    /* Metrics Strip */
    .metrics-strip { background: linear-gradient(90deg, #090D14 0%, #151D2A 100%); color: #FFF; padding: 4rem 0; border-top: 1px solid rgba(255,255,255,0.05); border-bottom: 1px solid rgba(255,255,255,0.05); }
    .metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; text-align: center; }
    .metric-value { font-size: 2.85rem; font-weight: 900; color: #38BDF8; line-height: 1.1; margin-bottom: 0.5rem; }
    .metric-name { font-size: 0.925rem; color: #94A3B8; font-weight: 500; }

    /* Testimonials */
    .testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .testi-card { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 2rem; display: flex; flex-direction: column; justify-content: space-between; }
    .testi-quote { font-size: 0.95rem; color: #334155; font-style: normal; line-height: 1.8; margin-bottom: 1.5rem; }
    .testi-author { display: flex; align-items: center; gap: 0.75rem; border-top: 1px solid #F1F5F9; padding-top: 1rem; }

    /* Insights Articles */
    .insights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .insight-card { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; }
    .insight-thumb { height: 180px; overflow: hidden; background: #E2E8F0; }
    .insight-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
    .insight-card:hover .insight-thumb img { transform: scale(1.04); }
    .insight-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
    .insight-date { font-size: 0.8rem; color: #94A3B8; margin-bottom: 0.5rem; }

    /* Comparison Table Matrix */
    .table-container { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow-x: auto; box-shadow: var(--shadow-sm); }
    .compare-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.925rem; }
    .compare-table th, .compare-table td { padding: 1.25rem 1.5rem; border-bottom: 1px solid #E2E8F0; }
    .compare-table th { background: #F8FAFC; font-weight: 700; color: #1E293B; }
    .highlight-col { background: #F0F7FF; color: var(--color-primary); font-weight: 700; }

    /* SLA & Security */
    .sla-banner { background: #F0FDF4; border: 1px solid #BBF7D0; border-radius: var(--radius-md); padding: 2rem; display: flex; justify-content: space-between; align-items: center; }

    /* FAQ */
    .faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 1rem; }
    .faq-item { background: #FFF; border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; }
    .faq-item details summary { padding: 1.25rem 1.5rem; font-weight: 700; cursor: pointer; list-style: none; position: relative; color: #1E293B; }
    .faq-item details summary::-webkit-details-marker { display: none; }
    .faq-item details summary::after { content: '+'; position: absolute; right: 1.5rem; font-size: 1.35rem; line-height: 1; color: var(--color-primary); }
    .faq-item details[open] summary::after { content: '–'; }
    .faq-content { padding: 0 1.5rem 1.25rem; font-size: 0.95rem; color: var(--color-text-muted); line-height: 1.8; border-top: 1px solid #F1F5F9; }

    /* CTA Section */
    .cta-box { background: linear-gradient(135deg, #0B0F17 0%, #172554 100%); color: #FFF; border-radius: var(--radius-lg); padding: 4.5rem 3rem; text-align: center; position: relative; overflow: hidden; }
    .cta-h2 { font-size: 2.5rem; font-weight: 900; margin-bottom: 1.25rem; color: #FFFFFF; }
    .cta-sub { font-size: 1.1rem; color: #94A3B8; max-width: 680px; margin: 0 auto 2.5rem; }

    /* Footer */
    .site-footer { background-color: #070A0F; color: #94A3B8; padding: 4.5rem 0 2rem; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.9rem; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 3rem; margin-bottom: 3.5rem; }
    .footer-title { color: #F1F5F9; font-weight: 700; font-size: 1rem; margin-bottom: 1.25rem; }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.65rem; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 2rem; display: flex; justify-content: space-between; align-items: center; font-size: 0.8rem; color: #64748B; }

    /* Mobile Responsive */
    @media (max-width: 1024px) {
      .hero-grid, .arch-grid, .case-grid { grid-template-columns: 1fr; }
      .grid-pain, .team-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-features, .product-grid, .time-slot-grid, .testi-grid, .insights-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-h1 { font-size: 2.15rem; }
      .grid-pain, .grid-features, .product-grid, .step-flow-grid, .time-slot-grid, .team-grid, .testi-grid, .insights-grid { grid-template-columns: 1fr; }
      .sla-banner { flex-direction: column; gap: 1.5rem; text-align: center; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
      .cta-box { padding: 3rem 1.5rem; }
    }