/* Estilos Globales - Unidad Educativa PCEI Tungurahua */
/* Repositorio de Cuadros de Calificaciones */

:root {
    --primary: 238, 82%, 59%; /* Indigo #4f46e5 */
    --primary-color: hsl(var(--primary));
    --primary-hover: hsl(238, 82%, 49%);
    --primary-glow: hsla(238, 82%, 59%, 0.12);
    
    --success: 160, 84%, 39%; /* Emerald #10b981 */
    --success-color: hsl(var(--success));
    --success-bg: hsl(160, 84%, 96%);
    --success-border: hsla(160, 84%, 39%, 0.15);
    
    --danger: 0, 84%, 60%; /* Rose #f43f5e */
    --danger-color: hsl(var(--danger));
    --danger-bg: hsl(0, 84%, 97%);
    --danger-border: hsla(0, 84%, 60%, 0.15);
    
    --warning: 38, 92%, 50%; /* Amber #f59e0b */
    --warning-color: hsl(var(--warning));
    --warning-bg: hsl(38, 92%, 96%);
    --warning-border: hsla(38, 92%, 50%, 0.15);
    
    --info: 194, 96%, 42%; /* Cyan #06b6d4 */
    --info-color: hsl(var(--info));
    --info-bg: hsl(194, 96%, 96%);
    --info-border: hsla(194, 96%, 42%, 0.15);

    --bg-main: #f8fafc; /* Slate 50 */
    --bg-card: #ffffff;
    --bg-sidebar: #0f172a; /* Slate 900 */
    --bg-sidebar-hover: #1e293b; /* Slate 800 */
    --bg-sidebar-active: #312e81; /* Deep Indigo */
    
    --text-primary: #0f172a; /* Slate 900 */
    --text-secondary: #334155; /* Slate 700 */
    --text-muted: #64748b; /* Slate 500 */
    --text-light: #f8fafc;
    
    --border-color: #e2e8f0; /* Slate 200 */
    --border-light: #f1f5f9; /* Slate 100 */
    
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -2px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* --- ESTILOS DE LOGIN PREMIUM --- */
.login-body {
    background-color: #0b0f19;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

/* Blobs de Fondo Decorativos */
.login-bg-blob {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    z-index: 1;
    pointer-events: none;
}
.login-bg-blob-1 {
    top: -100px;
    left: -100px;
    background-color: var(--primary-color);
}
.login-bg-blob-2 {
    bottom: -150px;
    right: -100px;
    background-color: var(--info-color);
}

.login-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 10;
}

.login-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl), inset 0 0 0 1px rgba(255,255,255,0.4);
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-icon {
    width: 68px;
    height: 68px;
    background-color: var(--primary-glow);
    color: var(--primary-color);
    border-radius: 22px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 16px;
    box-shadow: 0 8px 16px rgba(79, 70, 229, 0.15);
}

.logo-icon svg {
    width: 34px;
    height: 34px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.25;
}

.login-header h1 span {
    color: var(--primary-color);
    font-weight: 800;
}

.login-header .subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 8px;
}

.login-error-alert {
    background-color: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger-color);
    padding: 12px 16px;
    border-radius: var(--border-radius-md);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    animation: slideDown 0.3s ease;
}

.login-error-alert .alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.input-with-icon {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
}

.input-with-icon input,
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-family: inherit;
    font-size: 15px;
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: var(--transition);
}

.input-with-icon input {
    padding-left: 48px;
}

.input-with-icon input:focus,
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #ffffff;
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-block {
    display: flex;
    width: 100%;
    padding: 12px 24px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
}

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

.btn-secondary {
    background-color: #ffffff;
    color: var(--text-secondary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--border-light);
    color: var(--text-primary);
}

.btn-danger {
    background-color: var(--danger-color);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(244, 63, 94, 0.2);
}

.btn-danger:hover {
    background-color: hsl(0, 84%, 50%);
    transform: translateY(-1px);
}

.btn-success {
    background-color: var(--success-color);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    background-color: hsl(160, 84%, 32%);
    transform: translateY(-1px);
}

.btn-warning {
    background-color: var(--warning-color);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.2);
}

.btn-warning:hover {
    background-color: hsl(38, 92%, 40%);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: var(--border-radius-sm);
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    color: #94a3b8;
    font-size: 13px;
    position: relative;
    z-index: 10;
}


/* --- DISEÑO DE PANEL / DASHBOARD --- */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Estilos */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: var(--transition);
    z-index: 100;
}

.sidebar-brand {
    padding: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand svg {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.sidebar-brand h2 {
    font-size: 15px;
    font-weight: 700;
    line-height: 1.25;
}

.sidebar-brand h2 span {
    font-weight: 800;
    color: var(--primary-color);
    font-size: 17px;
    display: block;
    letter-spacing: 0.5px;
}

.sidebar-user {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    background-color: rgba(255,255,255,0.01);
}

.sidebar-user .user-name {
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user .user-role {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
    display: inline-block;
    background-color: rgba(255,255,255,0.06);
    padding: 2px 8px;
    border-radius: 20px;
}

.sidebar-menu {
    list-style: none;
    padding: 24px 16px;
    flex-grow: 1;
}

.sidebar-menu li {
    margin-bottom: 6px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    color: #94a3b8;
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: var(--transition);
    font-weight: 500;
    font-size: 14px;
}

.sidebar-menu a svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.sidebar-menu a:hover {
    color: #ffffff;
    background-color: var(--bg-sidebar-hover);
}

.sidebar-menu li.active a {
    color: #ffffff;
    background-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #f87171;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}

.sidebar-footer a:hover {
    color: #ef4444;
}

/* Sidebar Overlay para Móviles */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.25s ease;
}

/* Contenido Principal Layout */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.main-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 72px;
}

/* Botón Hamburguesa */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.menu-toggle:hover {
    background-color: var(--border-light);
    color: var(--text-primary);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

.header-title h1 {
    font-size: 20px;
    font-weight: 700;
}

.header-title p {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.institution-tag {
    background-color: var(--primary-glow);
    color: var(--primary-color);
    border: 1px solid hsla(var(--primary), 0.15);
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.5px;
}

.container-fluid {
    padding: 32px 40px;
    flex-grow: 1;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

/* Alertas Flash */
.alert {
    padding: 14px 20px;
    border-radius: var(--border-radius-md);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.alert-success {
    background-color: var(--success-bg);
    color: hsl(160, 84%, 25%);
    border: 1px solid var(--success-border);
}

.alert-error {
    background-color: var(--danger-bg);
    color: hsl(0, 84%, 40%);
    border: 1px solid var(--danger-border);
}

.alert-warning {
    background-color: var(--warning-bg);
    color: hsl(38, 92%, 30%);
    border: 1px solid var(--warning-border);
}

.alert-info {
    background-color: var(--info-bg);
    color: hsl(194, 96%, 30%);
    border: 1px solid var(--info-border);
}

.alert-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    transition: var(--transition);
    line-height: 1;
    padding: 4px;
}

.alert-close:hover {
    opacity: 1;
}

/* --- TARJETAS DE MÉTRICAS --- */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.metric-card {
    background-color: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
}

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

.metric-icon {
    width: 54px;
    height: 54px;
    border-radius: var(--border-radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.metric-icon svg {
    width: 26px;
    height: 26px;
    stroke-width: 2;
}

.metric-icon.blue {
    background-color: var(--info-bg);
    color: var(--info-color);
    border: 1px solid var(--info-border);
}

.metric-icon.green {
    background-color: var(--success-bg);
    color: var(--success-color);
    border: 1px solid var(--success-border);
}

.metric-icon.yellow {
    background-color: var(--warning-bg);
    color: var(--warning-color);
    border: 1px solid var(--warning-border);
}

.metric-icon.red {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border: 1px solid var(--danger-border);
}

.metric-info h3 {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-info .value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
    margin-top: 4px;
    color: var(--text-primary);
}

/* --- SECCIONES Y TABLAS --- */
.card-section {
    background-color: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    margin-bottom: 32px;
    overflow: hidden;
}

.section-header {
    padding: 20px 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.section-body {
    padding: 24px 32px;
}

/* Tablas Modernas */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table-modern {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table-modern th {
    background-color: var(--bg-main);
    color: var(--text-secondary);
    padding: 14px 24px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

.table-modern td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    vertical-align: middle;
    color: var(--text-secondary);
}

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

.table-modern tbody tr {
    transition: var(--transition);
}

.table-modern tbody tr:hover {
    background-color: var(--border-light);
}

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

/* Barra de progreso */
.progress-container {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    max-width: 240px;
}

.progress-bar {
    flex-grow: 1;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-fill.complete {
    background-color: var(--success-color);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.2);
}

.progress-fill.partial {
    background-color: var(--warning-color);
}

.progress-fill.empty {
    background-color: var(--danger-color);
}

.progress-text {
    font-size: 13px;
    font-weight: 600;
    min-width: 38px;
    text-align: right;
    color: var(--text-primary);
}

/* Badges / Etiquetas */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-success {
    background-color: var(--success-bg);
    color: var(--success-color);
    border: 1px solid var(--success-border);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: var(--warning-color);
    border: 1px solid var(--warning-border);
}

.badge-danger {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border: 1px solid var(--danger-border);
}

.badge-info {
    background-color: var(--info-bg);
    color: var(--primary-color);
    border: 1px solid var(--primary-glow);
}

/* Acciones en Tabla */
.table-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon {
    width: 34px;
    height: 34px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    color: var(--primary-color);
    background-color: var(--primary-glow);
    border-color: hsla(var(--primary), 0.2);
}

.btn-icon.danger:hover {
    color: var(--danger-color);
    background-color: var(--danger-bg);
    border-color: var(--danger-border);
}

.btn-icon svg {
    width: 16px;
    height: 16px;
    stroke-width: 2;
}

/* --- FILTROS DE BÚSQUEDA --- */
.filters-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    background-color: var(--bg-main);
    padding: 20px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.filters-row .form-group {
    margin-bottom: 0;
}

/* --- ZONA DE CARGA MASIVA (DRAG & DROP) --- */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    background-color: var(--bg-main);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    margin-bottom: 24px;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary-color);
    background-color: var(--primary-glow);
    box-shadow: inset 0 0 20px rgba(79, 70, 229, 0.05);
}

.upload-zone svg.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: 16px;
    transition: var(--transition);
}

.upload-zone:hover svg.upload-icon,
.upload-zone.dragover svg.upload-icon {
    color: var(--primary-color);
    transform: translateY(-4px);
}

.upload-zone h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.upload-zone p {
    font-size: 13px;
    color: var(--text-muted);
}

.upload-zone input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Resumen del Lote a Subir */
.upload-preview-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    margin-bottom: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    animation: slideDown 0.3s ease;
}

.upload-preview-header {
    background-color: var(--border-light);
    padding: 14px 20px;
    font-weight: 700;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.upload-preview-list {
    list-style: none;
}

.upload-preview-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    background-color: #ffffff;
    transition: var(--transition);
    flex-wrap: wrap;
    gap: 16px;
}

.upload-preview-item:last-child {
    border-bottom: none;
}

.upload-preview-item .file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.upload-preview-item .file-name {
    font-weight: 600;
    color: var(--text-primary);
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.upload-preview-item .file-size {
    color: var(--text-muted);
    font-size: 12px;
}

.upload-preview-item .mapping-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-preview-item select.mapping-select {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    font-family: inherit;
    background-color: #ffffff;
    color: var(--text-primary);
    transition: var(--transition);
}

.upload-preview-item select.mapping-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Asignaturas faltantes lista */
.missing-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.missing-item {
    display: inline-flex;
    align-items: center;
    background-color: var(--danger-bg);
    color: var(--danger-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--danger-border);
}

/* Formularios de Creación/Edición */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    margin-top: 24px;
}

.checkbox-group {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px 20px;
    max-height: 240px;
    overflow-y: auto;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.checkbox-item:hover {
    color: var(--text-primary);
}

.checkbox-item:last-child {
    margin-bottom: 0;
}

.checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* --- ANIMACIONES --- */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- RESPONSIVIDAD (MEDIA QUERIES) --- */
@media (max-width: 1024px) {
    /* Menú colapsable en móvil */
    .sidebar {
        position: fixed;
        top: 0;
        left: -280px;
        height: 100vh;
        width: 280px;
        z-index: 1000;
        box-shadow: var(--shadow-xl);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .sidebar-overlay.show {
        display: block;
        opacity: 1;
    }
    
    .menu-toggle {
        display: inline-flex;
    }
    
    .main-header {
        padding: 16px 20px;
    }
    
    .container-fluid {
        padding: 24px 20px;
    }
    
    .section-body {
        padding: 20px;
    }
}

@media (max-width: 640px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .login-card {
        padding: 28px 24px;
    }
    
    .filters-row {
        grid-template-columns: 1fr;
    }
    
    .upload-preview-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .upload-preview-item .mapping-info {
        width: 100%;
        justify-content: space-between;
    }
    
    .upload-preview-item select.mapping-select {
        flex-grow: 1;
        max-width: 200px;
    }
}