:root {
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --accent-color: #2563eb;
    --bg-main: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #334155;
    --border-color: #e2e8f0;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: var(--bg-main); color: var(--text-main); }

.admin-wrapper { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar { width: 260px; background-color: var(--sidebar-bg); color: #fff; display: flex; flex-direction: column; }
.sidebar-brand { padding: 1.5rem; font-size: 1.2rem; font-weight: bold; border-bottom: 1px solid var(--sidebar-hover); }
.sidebar-menu { list-style: none; padding: 1rem 0; }
.sidebar-menu li a { display: block; padding: 0.75rem 1.5rem; color: #94a3b8; text-decoration: none; transition: all 0.2s; }
.sidebar-menu li a:hover, .sidebar-menu li a.active { color: #fff; background-color: var(--sidebar-hover); border-left: 4px solid var(--accent-color); }

/* Main Content */
.main-content { flex: 1; display: flex; flex-direction: column; overflow-y: auto; }
.top-bar { background-color: var(--card-bg); padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); }
.user-badge { background: #e0f2fe; color: #0369a1; padding: 0.25rem 0.75rem; border-radius: 9999px; font-size: 0.85rem; font-weight: 600; }
.content-body { padding: 2rem; }

/* Cards & Grid */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.stat-card { background: var(--card-bg); padding: 1.5rem; border-radius: 8px; border: 1px solid var(--border-color); box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.stat-card h4 { font-size: 0.9rem; color: #64748b; margin-bottom: 0.5rem; }
.stat-number { font-size: 1.8rem; font-weight: bold; color: var(--sidebar-bg); }

.card { background: var(--card-bg); padding: 1.5rem; border-radius: 8px; border: 1px solid var(--border-color); margin-bottom: 1.5rem; }
.card h3 { margin-bottom: 1rem; font-size: 1.2rem; color: var(--sidebar-bg); }

/* Formularios */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 0.9rem; }
.form-group input, .form-group textarea { width: 100%; padding: 0.75rem; border: 1px solid var(--border-color); border-radius: 4px; font-size: 0.95rem; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-color); }

/* Tablas */
table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
table th, table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border-color); font-size: 0.9rem; }
table th { background-color: #f8fafc; color: var(--sidebar-bg); font-weight: 600; }

.btn-primary { background-color: var(--accent-color); color: white; border: none; padding: 0.75rem 1.5rem; border-radius: 4px; cursor: pointer; font-weight: 600; }
.btn-primary:hover { background-color: #1d4ed8; }

.btn-danger {
    background-color: #ef4444;
    color: white;
    border: none;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
}
.btn-danger:hover {
    background-color: #dc2626;
}