:root {
    --primary: #3b82f6; /* Niebieski */
    --primary-hover: #2563eb;
    --background: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --sidebar-width: 260px;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden { display: none !important; }

/* UTILS */
.w-full { width: 100%; }
.mt-4 { margin-top: 1rem; }
.ml-2 { margin-left: 0.5rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-small { font-size: 0.875rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.max-w-lg { max-width: 32rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }
.btn-primary { background-color: var(--primary); color: #fff; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-outline { background-color: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background-color: #f1f5f9; }
.btn-danger { background-color: #fee2e2; color: var(--danger); }
.btn-danger:hover { background-color: #fecaca; }

/* OVERLAY (Login & Modals) */
.overlay, .modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.login-card, .modal {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    animation: scaleIn 0.2s ease-out;
}

.login-card h2 { margin-bottom: 0.5rem; }
.login-card p { color: var(--text-muted); margin-bottom: 1.5rem; font-size: 0.9rem; }
.error-text { color: var(--danger); font-size: 0.875rem; margin-top: 1rem; text-align: center; }

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* FORMS */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}
.form-group input, .form-group select {
    width: 100%;
    padding: 0.625rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    outline: none;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* APP LAYOUT */
.app-container {
    display: flex;
    flex: 1;
    height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.brand {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border);
}
.brand h1 { font-size: 1.1rem; font-weight: 600; }
.brand-icon { font-size: 1.25rem; }

nav { flex: 1; padding: 1rem 0; }
.nav-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}
.nav-item:hover { color: var(--primary); background: #f1f5f9; }
.nav-item.active { color: var(--primary); background: #f1f5f9; border-left-color: var(--primary); }

.sidebar-footer { padding: 1.5rem; border-top: 1px solid var(--border); }

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.topbar {
    background: var(--surface);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}
.topbar h2 { font-size: 1.25rem; font-weight: 600; }
.region-badge {
    background: #e0e7ff;
    color: #4338ca;
    padding: 0.375rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.content-wrapper { padding: 2rem; }

/* CARDS & TABLES */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-header h3 { font-size: 1rem; font-weight: 600; }

.table-container { overflow-x: auto; }
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}
.data-table th { font-weight: 500; color: var(--text-muted); background: #f8fafc; }
.data-table td { color: var(--text); }
.data-table tr:last-child td { border-bottom: none; }

.settings-form { padding: 1.5rem; }
.divider { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
.settings-form h4 { margin-bottom: 1rem; font-size: 1rem; }

/* Status Messages */
.status-msg {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: fadeIn 0.3s ease;
}
.status-msg.success {
    background-color: #ecfdf5;
    color: #059669;
    border: 1px solid #10b981;
}
.status-msg.error {
    background-color: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}
.status-msg.info {
    background-color: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}