/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-critical: #ef4444;
    --color-warning: #f59e0b;
    --color-healthy: #10b981;
    --color-primary: #3b82f6;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
}

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

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

/* Header */
header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 30px;
    border-bottom: 3px solid var(--color-primary);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--color-text);
}

.subtitle {
    color: var(--color-text-light);
    font-size: 1.1rem;
}

/* Upload Section */
.upload-section {
    background: var(--color-surface);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.upload-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: var(--color-text-light);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
}

.loading-indicator {
    color: var(--color-text-light);
    font-size: 1rem;
}

/* Alert Banner */
.alert-banner {
    background: var(--color-critical);
    color: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
}

/* Summary Section */
.summary-section {
    margin-bottom: 30px;
}

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

.summary-card {
    background: var(--color-surface);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-left: 5px solid var(--color-primary);
}

.summary-card.critical {
    border-left-color: var(--color-critical);
}

.summary-card.warning {
    border-left-color: var(--color-warning);
}

.summary-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.summary-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
}

.summary-detail {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-top: 5px;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--color-border);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--color-text);
}

.tab-content h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--color-text);
}

/* Brand Cards */
.brand-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
}

.brand-card {
    background: var(--color-surface);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-left: 6px solid var(--color-healthy);
}

.brand-card.critical {
    border-left-color: var(--color-critical);
}

.brand-card.warning {
    border-left-color: var(--color-warning);
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--color-text);
}

.brand-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.metric-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.metric-value.critical {
    color: var(--color-critical);
}

.metric-value.warning {
    color: var(--color-warning);
}

.metric-value.healthy {
    color: var(--color-healthy);
}

.health-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 15px;
}

.health-badge.critical {
    background: var(--color-critical);
    color: white;
}

.health-badge.warning {
    background: var(--color-warning);
    color: white;
}

.health-badge.healthy {
    background: var(--color-healthy);
    color: white;
}

/* Inventory Cards */
.inventory-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.benchmark-info {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

/* PPC Cards */
.ppc-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.ppc-optimizer-link {
    text-align: center;
    margin-top: 30px;
}

/* Cashflow Overview */
.cashflow-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.cashflow-card {
    background: var(--color-surface);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
}

.cashflow-label {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cashflow-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-text);
}

.cashflow-detail {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: 8px;
}

.cashflow-card.critical .cashflow-value {
    color: var(--color-critical);
}

.cashflow-card.warning .cashflow-value {
    color: var(--color-warning);
}

/* Charts */
.chart-container {
    background: var(--color-surface);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

canvas {
    max-width: 100%;
    height: 300px !important;
}

/* Responsive */
@media (max-width: 768px) {
    .summary-cards,
    .brand-cards,
    .inventory-cards,
    .ppc-cards,
    .cashflow-overview {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .upload-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tab-nav {
        overflow-x: auto;
    }
}

/* Utility Classes */
.critical { color: var(--color-critical); }
.warning { color: var(--color-warning); }
.healthy { color: var(--color-healthy); }