:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd6;
    --accent-green: #28a745;
    --accent-red: #dc3545;
    --accent-blue: #17a2b8;
    --accent-purple: #6f42c1;
    --bg-dark: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --text-primary: #ffffff;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg-dark); color: var(--text-primary); min-height: 100vh; }

.app-container { display: flex; min-height: 100vh; }

.sidebar { width: 240px; background: var(--bg-secondary); border-right: 1px solid var(--border-color); flex-shrink: 0; }
.sidebar-header { padding: 20px; border-bottom: 1px solid var(--border-color); }
.sidebar-header h1 { font-size: 18px; color: var(--text-primary); }
.sidebar-nav { padding: 10px 0; }
.sidebar-nav ul { list-style: none; }
.sidebar-nav li { margin: 4px 12px; }
.sidebar-nav a { display: block; padding: 10px 16px; color: var(--text-muted); text-decoration: none; border-radius: 8px; transition: all 0.2s; font-size: 14px; }
.sidebar-nav a:hover { background: var(--bg-card); color: var(--text-primary); }
.sidebar-nav a.active { background: var(--primary-color); color: white; }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
.sidebar-footer span { font-size: 13px; color: var(--text-muted); }
.btn-logout { padding: 6px 12px; background: transparent; border: 1px solid var(--border-color); color: var(--text-muted); border-radius: 6px; cursor: pointer; font-size: 12px; }
.btn-logout:hover { background: var(--danger); border-color: var(--danger); color: white; }

.menu-toggle { display: none; background: transparent; border: none; color: var(--text-primary); font-size: 20px; cursor: pointer; padding: 4px 8px; border-radius: 6px; }
.menu-toggle:hover { background: var(--bg-card); }

.sidebar-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 998; }
.sidebar-overlay.show { display: block; }

.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.top-bar { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); }
.top-bar h2 { font-size: 20px; color: var(--text-primary); }
.top-actions { display: flex; gap: 10px; }

#pageContent { flex: 1; padding: 24px; overflow-y: auto; }

.btn-primary { padding: 8px 20px; background: var(--primary-color); color: white; border: none; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 500; transition: opacity 0.2s; }
.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary { padding: 8px 20px; background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border-color); border-radius: 8px; cursor: pointer; font-size: 14px; transition: all 0.2s; }
.btn-secondary:hover { background: var(--border-color); }
.btn-danger { padding: 8px 20px; background: var(--danger); color: white; border: none; border-radius: 8px; cursor: pointer; font-size: 14px; }
.btn-danger:hover { opacity: 0.9; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--bg-card); border-radius: 12px; padding: 20px; border-left: 4px solid var(--primary-color); }
.stat-card.green { border-left-color: var(--accent-green); }
.stat-card.red { border-left-color: var(--accent-red); }
.stat-card.blue { border-left-color: var(--accent-blue); }
.stat-card.purple { border-left-color: var(--accent-purple); }
.stat-label { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 600; color: var(--text-primary); }
.stat-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.data-table { width: 100%; border-collapse: collapse; background: var(--bg-card); border-radius: 12px; overflow: hidden; }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border-color); font-size: 14px; }
.data-table th { background: var(--bg-secondary); color: var(--text-muted); font-weight: 500; }
.data-table tr:hover { background: var(--bg-secondary); }
.data-table .positive { color: var(--accent-green); }
.data-table .negative { color: var(--accent-red); }

.form-container { background: var(--bg-card); border-radius: 12px; padding: 24px; max-width: 800px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-primary); font-size: 14px; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary-color); }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.form-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }

.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.7); display: none; z-index: 1000; }
.modal-overlay.show { display: block; }
.modal { display: none; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: var(--bg-card); border-radius: 12px; width: 90%; max-width: 700px; max-height: 85vh; overflow: hidden; z-index: 1001; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.modal-overlay.show ~ .modal { display: block; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); }
.modal-header h3 { font-size: 16px; }
.modal-close { background: transparent; border: none; color: var(--text-muted); font-size: 24px; cursor: pointer; }
.modal-body { padding: 20px; overflow-y: auto; max-height: calc(85vh - 120px); }
.modal-footer { padding: 16px 20px; background: var(--bg-secondary); border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 12px; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-success { background: rgba(40,167,69,0.1); color: var(--accent-green); border: 1px solid rgba(40,167,69,0.3); }
.alert-error { background: rgba(220,53,69,0.1); color: var(--accent-red); border: 1px solid rgba(220,53,69,0.3); }
.alert-warning { background: rgba(245,158,11,0.1); color: var(--warning); border: 1px solid rgba(245,158,11,0.3); }

.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 12px; font-weight: 500; }
.badge-success { background: rgba(40,167,69,0.2); color: var(--accent-green); }
.badge-warning { background: rgba(245,158,11,0.2); color: var(--warning); }
.badge-danger { background: rgba(220,53,69,0.2); color: var(--accent-red); }

.section-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; color: var(--text-primary); }
.section-card { background: var(--bg-card); border-radius: 12px; padding: 20px; margin-bottom: 20px; }

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .sidebar { position: fixed; left: -240px; top: 0; bottom: 0; z-index: 999; transition: left 0.3s; }
    .sidebar.show { left: 0; }
    .main-content { margin-left: 0; }
    .top-bar { padding: 12px 16px; }
    .top-bar h2 { font-size: 16px; }
    #pageContent { padding: 12px; }
    .stats-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .data-table { font-size: 12px; }
    .data-table th, .data-table td { padding: 8px 10px; }
}