/* Design System */
        :root {
            --color-white: rgba(255, 255, 255, 1);
            --color-black: rgba(0, 0, 0, 1);
            --color-cream-50: rgba(252, 252, 249, 1);
            --color-cream-100: rgba(255, 255, 253, 1);
            --color-gray-200: rgba(245, 245, 245, 1);
            --color-gray-300: rgba(167, 169, 169, 1);
            --color-gray-400: rgba(119, 124, 124, 1);
            --color-slate-500: rgba(98, 108, 113, 1);
            --color-brown-600: rgba(94, 82, 64, 1);
            --color-charcoal-700: rgba(31, 33, 33, 1);
            --color-charcoal-800: rgba(38, 40, 40, 1);
            --color-slate-900: rgba(19, 52, 59, 1);
            --color-teal-300: rgba(50, 184, 198, 1);
            --color-teal-400: rgba(45, 166, 178, 1);
            --color-teal-500: rgba(33, 128, 141, 1);
            --color-teal-600: rgba(29, 116, 128, 1);
            --color-teal-700: rgba(26, 104, 115, 1);
            --color-red-400: rgba(255, 84, 89, 1);
            --color-red-500: rgba(192, 21, 47, 1);
            --color-orange-400: rgba(230, 129, 97, 1);
            --color-orange-500: rgba(168, 75, 47, 1);
            --color-brown-600-rgb: 94, 82, 64;
            --color-teal-500-rgb: 33, 128, 141;
            --color-slate-900-rgb: 19, 52, 59;
            --color-bg-1: rgba(59, 130, 246, 0.08);
            --color-bg-2: rgba(245, 158, 11, 0.08);
            --color-bg-3: rgba(34, 197, 94, 0.08);
            --color-background: var(--color-cream-50);
            --color-surface: var(--color-cream-100);
            --color-text: var(--color-slate-900);
            --color-text-secondary: var(--color-slate-500);
            --color-primary: var(--color-teal-500);
            --color-primary-hover: var(--color-teal-600);
            --color-border: rgba(var(--color-brown-600-rgb), 0.2);
            --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
            --font-family-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --space-8: 8px;
            --space-12: 12px;
            --space-16: 16px;
            --space-20: 20px;
            --space-24: 24px;
            --space-32: 32px;
            --radius-base: 8px;
            --radius-lg: 12px;
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --color-background: var(--color-charcoal-700);
                --color-surface: var(--color-charcoal-800);
                --color-text: var(--color-gray-200);
                --color-text-secondary: rgba(167, 169, 169, 0.7);
                --color-primary: var(--color-teal-300);
                --color-primary-hover: var(--color-teal-400);
                --color-border: rgba(119, 124, 124, 0.3);
                --color-card-border: rgba(119, 124, 124, 0.2);
            }
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-family-base);
            background-color: var(--color-background);
            color: var(--color-text);
            line-height: 1.6;
        }

        .presentation-container {
            display: flex;
            min-height: 100vh;
        }

        /* Navigation Sidebar */
        .nav-sidebar {
            width: 280px;
            background-color: var(--color-surface);
            border-right: 1px solid var(--color-border);
            padding: var(--space-24);
            position: fixed;
            height: 100vh;
            overflow-y: auto;
        }

        .nav-logo {
            font-size: 24px;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: var(--space-32);
        }

        .nav-menu {
            list-style: none;
        }

        .nav-item {
            margin-bottom: var(--space-8);
        }

        .nav-link {
            display: block;
            padding: var(--space-12) var(--space-16);
            color: var(--color-text);
            text-decoration: none;
            border-radius: var(--radius-base);
            transition: all 0.2s ease;
            cursor: pointer;
            font-size: 14px;
        }

        .nav-link:hover {
            background-color: var(--color-bg-1);
            color: var(--color-primary);
        }

        .nav-link.active {
            background-color: var(--color-primary);
            color: white;
        }

        /* Main Content */
        .main-content {
            margin-left: 280px;
            flex: 1;
            padding: var(--space-32);
        }

        .section {
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .section.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Cover Page */
        .cover-page {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 80vh;
            text-align: center;
            background: linear-gradient(135deg, var(--color-bg-1) 0%, var(--color-bg-3) 100%);
            border-radius: var(--radius-lg);
            padding: var(--space-32);
        }

        .cover-page h1 {
            font-size: 48px;
            margin-bottom: var(--space-16);
            color: var(--color-primary);
        }

        .cover-page h2 {
            font-size: 28px;
            margin-bottom: var(--space-32);
            color: var(--color-text-secondary);
            font-weight: 400;
        }

        .cover-page .date {
            font-size: 18px;
            color: var(--color-text-secondary);
            margin-top: var(--space-32);
        }

        /* Cards */
        .card {
            background-color: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: var(--space-24);
            margin-bottom: var(--space-24);
            border: 1px solid var(--color-card-border);
            box-shadow: var(--shadow-md);
        }

        .card h2 {
            font-size: 32px;
            margin-bottom: var(--space-24);
            color: var(--color-primary);
        }

        .card h3 {
            font-size: 24px;
            margin-bottom: var(--space-16);
            color: var(--color-text);
        }

        .card h4 {
            font-size: 18px;
            margin-bottom: var(--space-12);
            color: var(--color-text);
        }

        .card p {
            margin-bottom: var(--space-16);
            color: var(--color-text-secondary);
            line-height: 1.8;
        }

        /* Statistics Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-16);
            margin: var(--space-24) 0;
        }

        .stat-box {
            background: var(--color-bg-1);
            padding: var(--space-20);
            border-radius: var(--radius-base);
            text-align: center;
        }

        .stat-box .stat-value {
            font-size: 32px;
            font-weight: 600;
            color: var(--color-primary);
            display: block;
            margin-bottom: var(--space-8);
        }

        .stat-box .stat-label {
            font-size: 14px;
            color: var(--color-text-secondary);
        }

        /* Demand Badges */
        .demand-badge {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-right: var(--space-8);
        }

        .demand-alto {
            background-color: rgba(192, 21, 47, 0.15);
            color: var(--color-red-500);
            border: 1px solid rgba(192, 21, 47, 0.25);
        }

        .demand-medio {
            background-color: rgba(245, 158, 11, 0.15);
            color: #d97706;
            border: 1px solid rgba(245, 158, 11, 0.25);
        }

        .demand-bajo {
            background-color: rgba(34, 197, 94, 0.15);
            color: #16a34a;
            border: 1px solid rgba(34, 197, 94, 0.25);
        }

        /* Chart Container */
        .chart-container {
            margin: var(--space-24) 0;
            text-align: center;
        }

        .chart-container img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-base);
            box-shadow: var(--shadow-md);
        }

        /* Monthly Plan Grid */
        .monthly-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: var(--space-20);
            margin-top: var(--space-24);
        }

        .month-card {
            background: var(--color-surface);
            border: 1px solid var(--color-card-border);
            border-radius: var(--radius-base);
            padding: var(--space-20);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .month-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .month-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--space-16);
            padding-bottom: var(--space-12);
            border-bottom: 2px solid var(--color-border);
        }

        .month-name {
            font-size: 20px;
            font-weight: 600;
            color: var(--color-text);
        }

        .month-info {
            margin-bottom: var(--space-16);
        }

        .month-info-item {
            display: flex;
            justify-content: space-between;
            padding: var(--space-8) 0;
            font-size: 14px;
        }

        .month-info-label {
            color: var(--color-text-secondary);
        }

        .month-info-value {
            font-weight: 600;
            color: var(--color-text);
        }

        .activities-list {
            list-style: none;
            padding-left: 0;
        }

        .activities-list li {
            padding: var(--space-8) 0;
            padding-left: var(--space-20);
            position: relative;
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        .activities-list li:before {
            content: '•';
            color: var(--color-primary);
            font-weight: bold;
            position: absolute;
            left: 0;
        }

        /* Benefits List */
        .benefits-list {
            list-style: none;
            padding-left: 0;
        }

        .benefits-list li {
            padding: var(--space-12) var(--space-16);
            margin-bottom: var(--space-12);
            background: var(--color-bg-3);
            border-radius: var(--radius-base);
            border-left: 4px solid var(--color-primary);
            font-size: 16px;
        }

        /* Implementation List */
        .implementation-list {
            list-style: none;
            padding-left: 0;
        }

        .implementation-list li {
            padding: var(--space-12) var(--space-16);
            margin-bottom: var(--space-12);
            background: var(--color-bg-1);
            border-radius: var(--radius-base);
            border-left: 4px solid var(--color-teal-400);
            font-size: 16px;
        }

        /* Valley Periods */
        .valley-period {
            background: var(--color-surface);
            border: 1px solid var(--color-card-border);
            border-radius: var(--radius-base);
            padding: var(--space-20);
            margin-bottom: var(--space-20);
        }

        .valley-period h4 {
            color: var(--color-primary);
            margin-bottom: var(--space-12);
        }

        .valley-period p {
            margin-bottom: var(--space-12);
        }

        .valley-period strong {
            color: var(--color-text);
        }

        /* Navigation Buttons */
        .nav-buttons {
            display: flex;
            justify-content: space-between;
            margin-top: var(--space-32);
            padding-top: var(--space-24);
            border-top: 1px solid var(--color-border);
        }

        .btn {
            padding: var(--space-12) var(--space-24);
            background-color: var(--color-primary);
            color: white;
            border: none;
            border-radius: var(--radius-base);
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.2s ease;
        }

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

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--color-primary);
            border: 1px solid var(--color-primary);
        }

        .btn-secondary:hover {
            background-color: var(--color-bg-1);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-sidebar {
                width: 100%;
                height: auto;
                position: relative;
                border-right: none;
                border-bottom: 1px solid var(--color-border);
            }

            .main-content {
                margin-left: 0;
                padding: var(--space-16);
            }

            .presentation-container {
                flex-direction: column;
            }

            .cover-page h1 {
                font-size: 32px;
            }

            .cover-page h2 {
                font-size: 20px;
            }

            .monthly-grid {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Print Styles */
        @media print {
            .nav-sidebar {
                display: none;
            }

            .main-content {
                margin-left: 0;
            }

            .section {
                display: block !important;
                page-break-after: always;
            }

            .nav-buttons {
                display: none;
            }
        }