/* Variables CSS */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 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);
}

/* Reset et base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Main content */
.main-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Configuration section */
.config-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    position: sticky;
    top: 20px;
}

.config-section h2 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* Example companies */
.example-companies {
    margin-bottom: 30px;
}

.example-companies h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-muted);
}

.company-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.company-btn {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    text-align: left;
}

.company-btn:hover {
    border-color: var(--primary-color);
    background: #f1f5f9;
    transform: translateY(-2px);
}

.company-btn.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.custom-btn {
    border-color: var(--success-color);
    color: var(--success-color);
    font-weight: 600;
}

.custom-btn:hover {
    background: var(--success-color);
    color: white;
}

/* Form styles */
.parameters-form {
    margin-top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Zucman info */
.zucman-info {
    background: #f0f9ff;
    border: 2px solid #0ea5e9;
    border-radius: 12px;
    padding: 20px;
    margin: 25px 0;
}

.zucman-info h4 {
    color: #0369a1;
    margin-bottom: 12px;
}

.zucman-info ul {
    list-style: none;
}

.zucman-info li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.zucman-info li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #0ea5e9;
    font-weight: bold;
}

/* Zucman button */
.zucman-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow);
}

.zucman-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.zucman-btn:active {
    transform: translateY(-1px);
}

/* Results section */
.results-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.results-section h2 {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: var(--primary-color);
    text-align: center;
}

/* KPIs */
.kpis-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.kpi-card {
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.kpi-card.negative {
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    border-color: #fca5a5;
}

.kpi-card.positive {
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
    border-color: #86efac;
}

.kpi-card.warning {
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    border-color: #fbbf24;
}

.kpi-card h3 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-value {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.negative .kpi-value {
    color: var(--danger-color);
}

.positive .kpi-value {
    color: var(--success-color);
}

.kpi-amount, .kpi-efficiency {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Charts */
.charts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.chart-wrapper {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.chart-wrapper h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-color);
    text-align: center;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.chart-wrapper canvas {
    max-height: 400px;
    width: 100%;
}

/* Analysis section */
.analysis-section {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    padding: 30px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.analysis-section h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.analysis-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.analysis-content p {
    margin-bottom: 15px;
}

.analysis-content strong {
    color: var(--primary-color);
}

/* Navigation */
.header-nav {
    margin-top: 20px;
}

.nav-link {
    display: inline-block;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Explanation page styles */
.explanation-content {
    max-width: 1000px;
    margin: 0 auto;
}

.methodology-section {
    background: var(--card-bg);
    margin-bottom: 30px;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.methodology-section h2 {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 25px;
}

.methodology-section h3 {
    color: var(--secondary-color);
    margin: 25px 0 15px 0;
}

.concept-box {
    background: linear-gradient(135deg, #e0f2fe, #b3e5fc);
    border: 2px solid #29b6f6;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.concept-box h3 {
    color: #01579b;
    margin-top: 0;
}

.parameters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.param-card {
    background: linear-gradient(135deg, #f3e5f5, #e1bee7);
    border: 2px solid #ba68c8;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.param-card h4 {
    color: #4a148c;
    margin: 0 0 10px 0;
}

.param-card p {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 10px 0;
}

.calculation-box {
    background: #f8f9fa;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
    font-family: 'Courier New', monospace;
}

.calculation-box h4 {
    color: var(--secondary-color);
    margin: 15px 0 10px 0;
}

.calculation-box code {
    background: var(--primary-color);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    display: block;
    margin: 10px 0;
    font-weight: bold;
}

.calculation-box small {
    color: var(--text-muted);
    font-style: italic;
}

.kpi-explanation {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    border: 2px solid #ff9800;
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
}

.kpi-explanation code {
    background: #e65100;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
}

.economic-concept {
    background: linear-gradient(135deg, #f1f8e9, #dcedc8);
    border: 2px solid #8bc34a;
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
}

.economic-concept ul {
    margin: 15px 0;
    padding-left: 20px;
}

.economic-concept li {
    margin-bottom: 8px;
    color: var(--text-color);
}

.limitations-box {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    border: 2px solid #f44336;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.limitations-box h4 {
    color: #c62828;
    margin-top: 0;
}

.graph-explanation {
    background: linear-gradient(135deg, #e8f5e8, #c8e6c9);
    border: 2px solid #4caf50;
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
}

.graph-explanation h4 {
    color: #2e7d32;
    margin: 15px 0 10px 0;
}

.key-questions {
    background: linear-gradient(135deg, #fff8e1, #ffecb3);
    border: 2px solid #ffc107;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.key-questions h4 {
    color: #f57c00;
    margin-top: 0;
}

.key-questions ul {
    margin: 15px 0;
    padding-left: 20px;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.resource-card {
    background: linear-gradient(135deg, #f3e5f5, #e1bee7);
    border: 2px solid #9c27b0;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s ease;
}

.resource-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.resource-card h4 {
    color: #6a1b9a;
    margin: 0 0 10px 0;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 50px;
    padding: 30px;
    color: var(--text-muted);
    font-style: italic;
}

/* Loading state */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-section {
    animation: fadeInUp 0.6s ease-out;
}

.disclaimer-box {
    background: linear-gradient(135deg, #fef3c7, #fed7aa);
    border: 2px solid #f59e0b;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.disclaimer-box p {
    margin: 0;
    color: #92400e;
    font-weight: 500;
}

.insight-box {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border: 2px solid #3b82f6;
    border-radius: 12px;
    padding: 16px;
    margin: 16px 0;
}

.insight-box h4 {
    margin: 0 0 12px 0;
    color: #1e40af;
    font-size: 1.1em;
}

.insight-box p {
    margin: 8px 0;
    color: #1e3a8a;
    line-height: 1.5;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .charts-container {
        grid-template-columns: 1fr;
    }

    .kpis-container {
        grid-template-columns: 1fr;
    }
}