/* 
   Variables y Configuración del Tema Oscuro Premium
   - Usamos colores vibrantes HSL
   - Glassmorphism para las tarjetas
*/
:root {
    --bg-dark: #0f172a;
    --bg-panel: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-muted: #94a3b8;
    
    --brand-primary: #3b82f6;
    --brand-accent: #8b5cf6;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #0ea5e9;
    
    --font-base: 'Inter', system-ui, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-base);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
    /* Efecto gradiente de fondo radial suave */
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 40%);
    background-attachment: fixed;
}

/* Efecto Glassmorphism */
.glass {
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: rgba(15, 23, 42, 0.8);
    border-right: 1px solid var(--glass-border);
    padding: 24px 0;
    display: flex;
    flex-direction: column;
}

.sidebar .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px 32px;
    font-size: 1.2rem;
    color: var(--brand-primary);
    border-bottom: 1px solid var(--glass-border);
}

.sidebar nav ul {
    list-style: none;
    margin-top: 24px;
}

.sidebar nav ul li {
    padding: 16px 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    transition: var(--transition-smooth);
    font-weight: 500;
}

.sidebar nav ul li:hover, .sidebar nav ul li.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border-right: 3px solid var(--brand-primary);
}

/* Layout Principal */
.content {
    flex: 1;
    padding: 32px 48px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* Header */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-header h1 {
    font-size: 2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    font-size: 0.75rem;
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.6; }
    100% { opacity: 1; }
}

.subtitle {
    color: var(--text-muted);
    margin-top: 4px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
    background: var(--bg-panel);
    padding: 8px 16px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
}

/* Tarjetas de Estadísticas */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.stat-card {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.icon-wrap.blue { background: rgba(59, 130, 246, 0.15); color: var(--brand-primary); }
.icon-wrap.green { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.icon-wrap.purple { background: rgba(139, 92, 246, 0.15); color: var(--brand-accent); }
.icon-wrap.red { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

.stat-info h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-info p {
    font-size: 1.8rem;
    font-weight: 700;
    margin-top: 4px;
}

/* Filtros */
.filters {
    padding: 16px 24px;
    display: flex;
    gap: 16px;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 8px 16px;
    gap: 10px;
    flex: 1;
}

.filter-group input, .filter-group select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    width: 100%;
}

.filter-group select option {
    background: var(--bg-dark);
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary), #2563eb);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-smooth);
    font-family: inherit;
}

.btn-primary:hover {
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

/* Tabla */
.data-table-container {
    padding: 0;
    overflow-x: auto;
}

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

.data-table th, .data-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(255, 255, 255, 0.02);
}

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

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.data-table td.break-word {
    word-break: break-all;
    max-width: 300px;
}

/* Badges de Estado para Acciones */
.action-badge {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}

.action-LOGIN { background: rgba(16, 185, 129, 0.2); color: var(--success); }
.action-LOGOUT { background: rgba(148, 163, 184, 0.2); color: var(--text-muted); }
.action-UPLOAD { background: rgba(139, 92, 246, 0.2); color: var(--brand-accent); }
.action-DOWNLOAD { background: rgba(59, 130, 246, 0.2); color: var(--info); }
.action-DELETE { background: rgba(239, 68, 68, 0.2); color: var(--danger); }
.action-LOGIN_FAILED { background: rgba(245, 158, 11, 0.2); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.5); }

/* Loader */
.spinner {
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top: 3px solid var(--brand-primary);
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 10px;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.loading-state td {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* ======== LOGIN STYLES ======== */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    padding: 40px;
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    text-align: center;
}

.login-container h2 {
    font-size: 2rem;
    color: var(--brand-primary);
}

.login-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.form-group {
    display: flex;
    flex-direction: column;
    text-align: left;
    gap: 8px;
    margin-bottom: 20px;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.form-group input {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: var(--transition-smooth);
}

.form-group input:focus {
    border-color: var(--brand-primary);
    background: rgba(0,0,0,0.3);
}