:root {
    --bg-primary: #090d16;
    --bg-card: #111827;
    --bg-sidebar: #0d1322;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-neon: #06b6d4;
    --border-color: #1f2937;
    --shadow-color: rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent-blue: #2563eb;
    --accent-purple: #7c3aed;
    --accent-neon: #0891b2;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

body.login-page {
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #111827 0%, #090d16 100%);
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 25px -5px var(--shadow-color);
}

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

.login-header h2 {
    color: var(--accent-neon);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-neon);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: #fff;
    width: 100%;
}

.btn-primary:hover {
    opacity: 0.9;
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid #ef4444;
    color: #ef4444;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-brand {
    padding: 1.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--accent-neon);
    border-bottom: 1px solid var(--border-color);
    letter-spacing: 0.5px;
}

.sidebar-menu {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
    overflow-y: auto;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
}

.sidebar-menu li a:hover,
.sidebar-menu li a.active {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.08);
    border-left-color: var(--accent-neon);
}

.sidebar-menu li a i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* Layout Principal y Topbar */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
    min-height: 100vh;
}

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

.topbar h2 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.btn-icon {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
}

.btn-icon:hover {
    border-color: var(--accent-neon);
    color: var(--accent-neon);
}

.admin-welcome {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.btn-logout {
    color: #ef4444;
    font-size: 1.2rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(239, 68, 68, 0.1);
}

/* Tarjetas Estadísticas del Dashboard */
.stats-grid {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)) !important;
    gap: 1.5rem !important;
    margin-bottom: 2rem !important;
}

.stat-card {
    background-color: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 14px !important;
    padding: 1.5rem !important;
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 1.25rem !important;
    box-shadow: 0 10px 15px -3px var(--shadow-color) !important;
}

.stat-icon {
    width: 55px !important;
    height: 55px !important;
    border-radius: 12px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 1.5rem !important;
    color: #fff !important;
    flex-shrink: 0 !important;
}

.stat-info {
    display: flex !important;
    flex-direction: column !important;
}

.stat-info h3 {
    font-size: 0.85rem !important;
    font-weight: 600 !important;
    color: var(--text-secondary) !important;
    text-transform: uppercase !important;
    letter-spacing: 0.5px !important;
    margin-bottom: 0.35rem !important;
}

.stat-info p {
    font-size: 1.75rem !important;
    font-weight: 800 !important;
    color: var(--text-primary) !important;
    line-height: 1 !important;
}

.bg-blue { background: linear-gradient(135deg, #3b82f6, #1d4ed8) !important; }
.bg-green { background: linear-gradient(135deg, #10b981, #047857) !important; }
.bg-yellow { background: linear-gradient(135deg, #f59e0b, #b45309) !important; }
.bg-red { background: linear-gradient(135deg, #ef4444, #b91c1c) !important; }
.bg-purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9) !important; }

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
}