/* Tema Oscuro - MetriCol */
:root {
    --primary-color: #4267B2;
    --primary-hover: #365899;
    --secondary-color: #42B883;
    --danger-color: #E74C3C;
    --warning-color: #F39C12;
    --success-color: #27AE60;
    
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --bg-card: #333333;
    
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    
    --border-color: #404040;
    --border-light: #555555;
    
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-box {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.login-footer {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.login-footer p {
    margin: 0.25rem 0;
}

/* Dashboard Layout */
.dashboard {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 1rem 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 0 1.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.sidebar-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
}

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

.sidebar-nav li {
    margin: 0.25rem 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-right: 3px solid var(--primary-color);
}

.sidebar-nav i {
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
}

/* Menu Separator */
.menu-separator {
    padding: 1rem 1.5rem 0.5rem;
    margin-top: 0.5rem;
}

.menu-separator span {
    font-size: 0.7rem;
    font-weight: 700;
    color: #808080;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Disabled Menu Items */
.sidebar-nav li a.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.sidebar-nav li a .badge {
    background: var(--primary-color);
    color: white;
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: auto;
    font-weight: 600;
}

/* Dropdown Menu */
.dropdown-menu .dropdown-toggle {
    position: relative;
    cursor: pointer;
}

.dropdown-menu .dropdown-icon {
    margin-left: auto;
    margin-right: 0;
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.dropdown-menu .submenu {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: var(--bg-primary);
}

.dropdown-menu .submenu.open {
    max-height: 300px;
}

.dropdown-menu .submenu li {
    margin: 0;
}

.dropdown-menu .submenu a {
    padding: 0.6rem 1.5rem 0.6rem 3rem;
    font-size: 0.9rem;
    border-right: none;
}

.dropdown-menu .submenu a:hover,
.dropdown-menu .submenu a.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-left: 3px solid var(--primary-color);
    border-right: none;
}

.dropdown-menu .submenu a i {
    font-size: 0.85rem;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding-bottom: 1rem;
}

.main-content {
    flex: 1;
    margin-left: 250px;
    background: var(--bg-primary);
}

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.content {
    padding: 2rem;
}

/* Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.stat-card-title {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.stat-card-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.stat-card-change {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 500;
}

.stat-card-change.positive {
    color: var(--success-color);
}

.stat-card-change.negative {
    color: var(--danger-color);
}

.stat-card-change.neutral {
    color: var(--text-muted);
}

.stat-card-change i {
    margin-right: 0.25rem;
}

/* Forms */
.form-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.form-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 103, 178, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: #369870;
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    background: #c0392b;
    transform: translateY(-1px);
}

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Tables */
.table-section {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.table-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table td {
    color: var(--text-primary);
}

.table tbody tr:hover {
    background: var(--bg-tertiary);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid;
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.alert-warning {
    background: rgba(243, 156, 18, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(66, 103, 178, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Charts */
.chart-container {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-header h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
}

.chart-filters {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.chart-filters select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* File Upload */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    background: var(--bg-tertiary);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(66, 103, 178, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(66, 103, 178, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-text {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.upload-subtext {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .dashboard {
        flex-direction: column;
    }
    
    .header {
        padding: 1rem;
    }
    
    .content {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Progress Bar */
.progress {
    background: var(--bg-tertiary);
    border-radius: 4px;
    height: 8px;
    overflow: hidden;
    margin: 0.5rem 0;
}

.progress-bar {
    background: var(--primary-color);
    height: 100%;
    transition: width 0.3s ease;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* Form Controls */
.form-control, select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Chart Container */
.chart-container {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    height: 400px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.chart-header h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.chart-filters select {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
}

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