:root {
            --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --bg-main: #f1f5f9;
            --bg-card: #ffffff;
            --bg-subtle: #e2e8f0;
            --border-color: #e2e8f0;
            --border-hover: #cbd5e1;
            --text-main: #0f172a;
            --text-muted: #475569;
            --text-dim: #94a3b8;
            
            /* IELTS Brand Violet Accent */
            --primary: #7c3aed;
            --primary-hover: #6d28d9;
            --primary-light: #f5f3ff;
            --primary-border: #ddd6fe;
            
            /* Action Button Orange */
            --cta-orange: #fa5a29;
            --cta-orange-hover: #e04818;
            
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
            
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-pill: 9999px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        body {
            background-color: var(--bg-main);
            color: #334155;
            font-family: var(--font-sans);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .text-main { color: #0F172A; }
        .text-accent { color: #7c3aed; }
        .bg-accent { background-color: #7c3aed; }
        .border-accent { border-color: #7c3aed; }
        .text-alert { color: #e74c3c; }
        .bg-alert { background-color: #e74c3c; }
        .text-success-alt { color: #FFC321; }

        /* Container Standard - Responsywny dla standardowych i szerokich ekranów */
        .site-container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        @media (min-width: 1440px) {
            .site-container {
                max-width: 1440px;
                padding: 0 24px;
            }
        }

        @media (min-width: 1536px) {
            .site-container {
                max-width: 1536px;
                padding: 0 32px;
            }
        }

        @media (max-width: 640px) {
            .site-container {
                padding: 0 16px;
            }
        }

        /* ==========================================================================
           GLOBAL SITE HEADER (BRAND NAVIGATION)
           ========================================================================== */
        .site-header {
            background: #ffffff;
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 8px -2px rgba(15, 23, 42, 0.04);
            position: sticky;
            top: 0;
            z-index: 150;
            width: 100%;
        }

        .site-header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        @media (min-width: 1440px) {
            .site-header-container {
                max-width: 1440px;
                padding: 0 24px;
            }
        }

        @media (min-width: 1536px) {
            .site-header-container {
                max-width: 1536px;
                padding: 0 32px;
            }
        }

        .site-brand-wrapper {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .site-brand-link {
            display: inline-flex;
            align-items: center;
            text-decoration: none;
            flex-shrink: 0;
        }

        .site-brand-logo {
            height: 48px;
            width: auto;
            display: block;
            object-fit: contain;
        }

        .site-brand-badge {
            font-size: 0.74rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            padding: 4px 10px;
            background: #f5f3ff;
            color: #7c3aed;
            border: 1px solid #ddd6fe;
            border-radius: var(--radius-pill);
            white-space: nowrap;
            text-decoration: none;
            transition: all 0.15s ease;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
        }

        .site-brand-badge:hover {
            background: #ede9fe;
            color: #6d28d9;
            border-color: #c4b5fd;
            transform: translateY(-1px);
        }

        .site-nav-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .site-nav-link {
            color: var(--text-muted);
            font-size: 0.90rem;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            transition: all 0.15s ease;
            white-space: nowrap;
            text-decoration: none;
        }

        .site-nav-link:hover {
            color: #0f172a;
            background: var(--bg-subtle);
        }

        .site-cta-btn {
            background: var(--cta-orange);
            color: #ffffff !important;
            font-size: 0.88rem;
            font-weight: 700;
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            text-decoration: none;
            white-space: nowrap;
            transition: all 0.2s ease;
            box-shadow: 0 2px 6px rgba(250, 90, 41, 0.25);
            margin-left: 6px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            cursor: pointer;
            border: none;
        }

        .site-cta-btn:hover {
            background: var(--cta-orange-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(250, 90, 41, 0.35);
        }

        /* Mobile Hamburger Button */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: 1px solid var(--border-color);
            padding: 8px;
            border-radius: var(--radius-sm);
            color: var(--text-main);
            cursor: pointer;
            line-height: 0;
        }

        .mobile-menu-drawer {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #ffffff;
            border-bottom: 2px solid var(--border-color);
            box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.1);
            padding: 16px 20px 24px;
            z-index: 140;
            max-height: calc(100vh - 76px);
            overflow-y: auto;
        }

        .mobile-menu-drawer.open {
            display: block;
        }

        .mobile-nav-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin: 0;
            padding: 0;
        }

        .mobile-nav-list .site-nav-link {
            display: block;
            padding: 12px 14px;
            font-size: 1rem;
            border-radius: 8px;
        }

        .mobile-cta-wrapper {
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid var(--border-color);
        }

        .mobile-cta-wrapper .site-cta-btn {
            display: flex;
            justify-content: center;
            width: 100%;
            margin: 0;
            padding: 12px;
            font-size: 1rem;
        }

        @media (max-width: 1024px) {
            .site-nav-desktop {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .site-brand-logo {
                height: 38px;
            }
        }

        /* Elegant Cards & Tabs */
        .premium-card {
            background: #FFFFFF;
            border: 1px solid rgba(15, 23, 42, 0.08);
            border-radius: 16px;
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.04), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .premium-card:hover {
            box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
        }

        /* Modern Nav Tab Buttons */
        .nav-tab-btn {
            outline: none !important;
            box-shadow: var(--shadow-sm);
            text-decoration: none !important;
            box-sizing: border-box;
            cursor: pointer;
            font-size: 0.88rem;
            font-weight: 700;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border-color);
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            color: var(--text-muted);
            background-color: #FFFFFF;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
        }
        .nav-tab-btn:hover {
            border-color: var(--primary-border);
            color: var(--primary);
            background-color: var(--primary-light);
            transform: translateY(-1px);
        }
        .nav-tab-btn.active {
            background-color: var(--primary);
            border-color: var(--primary);
            color: #FFFFFF;
            box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
        }

        /* Language Toggle Switch */
        .lang-switch {
            background-color: #F1F5F9;
            border: 1px solid rgba(15, 23, 42, 0.08);
            border-radius: 20px;
            padding: 3px;
            display: inline-flex;
            position: relative;
        }
        .lang-btn {
            font-size: 11px;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 16px;
            cursor: pointer;
            transition: all 0.2s ease;
            text-transform: uppercase;
            border: none;
            background: transparent;
            color: #64748b;
        }
        .lang-btn.active {
            background-color: var(--primary);
            color: #FFFFFF;
            box-shadow: 0 2px 6px rgba(124, 58, 237, 0.25);
        }

        /* Charts */
        .chart-container {
            position: relative;
            width: 100%;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            height: 300px;
            max-height: 380px;
        }
        @media (min-width: 768px) {
            .chart-container {
                height: 350px;
            }
        }

        /* Accordion Traps */
        .trap-detail {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .trap-detail.open {
            max-height: 1200px;
            padding: 1rem 0;
        }

        .tab-content { display: none; }
        .tab-content.active {
            display: block;
            animation: rs-fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        @keyframes rs-fadeIn {
            from { opacity: 0; transform: translateY(6px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ==========================================================================
           CANONICAL CALLOUT BOXES: WSKAZÓWKA, UWAGA, SUKCES (STANDARD_CALLOUTS.md)
           ========================================================================== */
        .tip-box,
        .warning-box,
        .success-box {
          border-radius: 0.75rem;
          padding: 1rem 1.25rem;
          font-size: 0.875rem;
          line-height: 1.6;
          display: flex;
          align-items: flex-start;
          gap: 0.875rem;
        }

        /* 💡 Wskazówka (Tip) - Cambridge Sky/Blue */
        .tip-box {
          background-color: #f0f9ff;
          border: 1px solid #bae6fd;
          border-left: 4px solid #0284c7;
          color: #0369a1;
        }

        /* ⚠️ Uwaga (Warning) - Warm Amber */
        .warning-box {
          background-color: #fffbeb;
          border: 1px solid #fde68a;
          border-left: 4px solid #f59e0b;
          color: #b45309;
        }

        /* ✅ Sukces (Success) - Emerald */
        .success-box {
          background-color: #f0fdf4;
          border: 1px solid #bbf7d0;
          border-left: 4px solid #16a34a;
          color: #15803d;
        }

        .tip-box .callout-icon,
        .warning-box .callout-icon,
        .success-box .callout-icon {
          font-size: 1.25rem;
          line-height: 1;
          flex-shrink: 0;
          margin-top: 0.125rem;
        }

        .tip-box .callout-content,
        .warning-box .callout-content,
        .success-box .callout-content {
          flex: 1 1 0%;
          min-width: 0;
          color: #334155;
        }

        .tip-box:last-child,
        .warning-box:last-child,
        .success-box:last-child {
          margin-bottom: 0;
        }

        /* ==========================================================================
           GLOBAL SITE FOOTER
           ========================================================================== */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            border-top: 1px solid #1e293b;
            padding: 56px 0 32px;
            margin-top: 40px;
            width: 100%;
        }

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

        @media (min-width: 1440px) {
            .site-footer-container {
                max-width: 1440px;
            }
        }

        @media (min-width: 1536px) {
            .site-footer-container {
                max-width: 1536px;
                padding: 0 32px;
            }
        }

        .site-footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid #1e293b;
        }

        .footer-col {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .footer-brand-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-brand-desc {
            font-size: 0.88rem;
            line-height: 1.6;
            color: #94a3b8;
            margin: 0 0 20px 0;
            max-width: 440px;
        }

        .footer-linkedin-card {
            display: flex;
            align-items: center;
            gap: 12px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid #1e293b;
            border-radius: 10px;
            padding: 10px 14px;
            margin-top: auto;
            max-width: 380px;
            text-decoration: none;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .footer-linkedin-card:hover {
            background: rgba(10, 102, 194, 0.08);
            border-color: rgba(10, 102, 194, 0.45);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px -2px rgba(10, 102, 194, 0.2);
        }

        .footer-linkedin-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: #0a66c2;
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform 0.2s ease;
        }

        .footer-linkedin-card:hover .footer-linkedin-icon {
            transform: scale(1.05);
        }

        .footer-linkedin-text {
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .footer-linkedin-title {
            font-size: 0.82rem;
            font-weight: 700;
            color: #f1f5f9;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .footer-linkedin-arrow {
            color: #60a5fa;
            transition: transform 0.2s ease;
        }

        .footer-linkedin-card:hover .footer-linkedin-arrow {
            transform: translateX(3px);
            color: #93c5fd;
        }

        .footer-linkedin-sub {
            font-size: 0.72rem;
            color: #94a3b8;
            margin-top: 1px;
        }

        .footer-col-title {
            font-size: 0.82rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #ffffff;
            margin: 0 0 16px 0;
        }

        .footer-links-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin: 0 0 20px 0;
            padding: 0;
        }

        .footer-links-list a {
            font-size: 0.90rem;
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.15s ease, transform 0.15s ease;
            display: inline-block;
        }

        .footer-links-list a:hover {
            color: #ffffff;
            transform: translateX(3px);
        }

        .footer-cta-emerald {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: rgba(16, 185, 129, 0.14);
            border: 1px solid rgba(16, 185, 129, 0.45);
            color: #6ee7b7;
            font-size: 0.82rem;
            font-weight: 700;
            padding: 11px 14px;
            border-radius: 9px;
            text-decoration: none;
            margin-top: auto;
            width: 100%;
            max-width: 320px;
            box-sizing: border-box;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            box-shadow: 0 2px 8px -2px rgba(16, 185, 129, 0.2);
        }

        .footer-cta-emerald:hover {
            background: #059669;
            border-color: #059669;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(5, 150, 105, 0.4);
        }

        .footer-cta-emerald .footer-btn-arrow {
            transition: transform 0.2s ease;
        }

        .footer-cta-emerald:hover .footer-btn-arrow {
            transform: translateX(3px);
        }

        .footer-cta-contact {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid #1e293b;
            color: #e2e8f0;
            font-size: 0.82rem;
            font-weight: 600;
            padding: 11px 14px;
            border-radius: 9px;
            text-decoration: none;
            margin-top: auto;
            width: 100%;
            max-width: 320px;
            box-sizing: border-box;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .footer-cta-contact:hover {
            background: rgba(255, 255, 255, 0.09);
            border-color: #334155;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

        .footer-cta-contact .footer-btn-arrow {
            transition: transform 0.2s ease;
            color: #94a3b8;
        }

        .footer-cta-contact:hover .footer-btn-arrow {
            transform: translateX(3px);
            color: #ffffff;
        }

        .site-footer-bottom {
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: #64748b;
        }

        .footer-legal-links {
            display: flex;
            gap: 16px;
        }

        .footer-legal-links a {
            color: #64748b;
            text-decoration: none;
            transition: color 0.15s ease;
        }

        .footer-legal-links a:hover {
            color: #94a3b8;
        }

        @media (max-width: 960px) {
            .site-footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 640px) {
            .site-footer {
                padding: 40px 0 24px;
            }
            .site-footer-grid {
                gap: 24px;
            }
            .site-footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 10px;
            }
        }