/* =========================================================================
   CAMMESA Dashboard — Dark Mode Design System
   ========================================================================= */

:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(30, 41, 59, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(99, 102, 241, 0.4);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-blue: #6366f1;
    --accent-blue-glow: rgba(99, 102, 241, 0.3);
    --accent-cyan: #22d3ee;
    --accent-green: #34d399;
    --accent-amber: #fbbf24;
    --accent-rose: #f43f5e;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --gradient-header: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --gradient-card: linear-gradient(145deg, rgba(30, 41, 59, 0.5) 0%, rgba(17, 24, 39, 0.8) 100%);

    /* Spacing */
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;

    /* Shadows */
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3), 0 1px 4px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);
}

/* =========================================================================
   Reset & Base
   ========================================================================= */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Animated gradient background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(34, 211, 238, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* =========================================================================
   Header
   ========================================================================= */

.header {
    position: relative;
    background: var(--gradient-header);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 2rem 1.5rem;
    z-index: 1;
}

.header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0.6;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 400;
}

/* =========================================================================
   Controls
   ========================================================================= */

.controls {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 1.5rem auto;
    padding: 0 2rem;
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.control-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-group input[type="date"],
.control-group select {
    padding: 0.6rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.control-group input[type="date"]:focus,
.control-group select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px var(--accent-blue-glow);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s, opacity 0.2s;
    box-shadow: 0 2px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.loading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* =========================================================================
   KPI Cards
   ========================================================================= */

.kpi-cards {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 1.5rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.kpi-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    backdrop-filter: blur(12px);
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
}

.kpi-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.kpi-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0.25rem 0;
    letter-spacing: -0.02em;
}

.kpi-unit {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* =========================================================================
   Dashboard Grid
   ========================================================================= */

.dashboard {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem 3rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* =========================================================================
   Cards
   ========================================================================= */

.card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-card);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.card-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-badge {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--accent-blue);
    background: rgba(99, 102, 241, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* =========================================================================
   Charts
   ========================================================================= */

.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
}

.chart-container canvas {
    width: 100% !important;
    height: 100% !important;
}

/* =========================================================================
   Tables
   ========================================================================= */

.table-filter {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.table-filter label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.table-filter select {
    padding: 0.4rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.8rem;
    outline: none;
    transition: border-color 0.2s;
}

.table-filter select:focus {
    border-color: var(--accent-blue);
}

.table-container {
    overflow-x: auto;
    max-height: 450px;
    overflow-y: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

thead {
    position: sticky;
    top: 0;
    z-index: 2;
}

thead th {
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(8px);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

tbody tr {
    transition: background-color 0.15s;
}

tbody tr:hover {
    background: rgba(99, 102, 241, 0.06);
}

tbody td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    white-space: nowrap;
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Highlight costo values */
td.costo-alto {
    color: var(--accent-rose);
    font-weight: 600;
}

td.costo-medio {
    color: var(--accent-amber);
    font-weight: 500;
}

td.costo-bajo {
    color: var(--accent-green);
}

/* =========================================================================
   Card Header Actions
   ========================================================================= */

.card-header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* =========================================================================
   Toggle Switch
   ========================================================================= */

.toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.toggle input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: background 0.25s, border-color 0.25s;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: transform 0.25s, background 0.25s;
}

.toggle input:checked+.toggle-slider {
    background: var(--accent-blue-glow);
    border-color: var(--accent-blue);
}

.toggle input:checked+.toggle-slider::after {
    transform: translateX(16px);
    background: var(--accent-blue);
}

.toggle-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* =========================================================================
   Currency Toggle (segmented control)
   ========================================================================= */

.currency-toggle {
    display: inline-flex;
    border-radius: var(--radius-xs);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.currency-btn {
    padding: 0.3rem 0.75rem;
    background: transparent;
    color: var(--text-muted);
    border: none;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    letter-spacing: 0.03em;
}

.currency-btn:not(:last-child) {
    border-right: 1px solid var(--border-color);
}

.currency-btn.active {
    background: var(--accent-blue);
    color: white;
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.currency-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
}

/* =========================================================================
   Footer
   ========================================================================= */

.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
}

.footer a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--accent-cyan);
}

/* =========================================================================
   Empty state
   ========================================================================= */

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem 1rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .controls {
        padding: 0 1rem;
    }

    .kpi-cards {
        padding: 0 1rem;
        grid-template-columns: repeat(2, 1fr);
    }

    .dashboard {
        padding: 1rem 1rem 2rem;
    }

    .chart-container {
        height: 250px;
    }

    .kpi-value {
        font-size: 1.5rem;
    }
}

/* =========================================================================
   Scrollbar
   ========================================================================= */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}