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

:root {
    --night-blue: #1a2332;
    --red-action: #dc3545;
    --yellow-indicator: #ffc107;
    --white-bg: #ffffff;
    --light-gray: #f8f9fa;
    --border-gray: #dee2e6;
    --text-dark: #212529;
    --text-muted: #6c757d;
    --success-green: #28a745;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--white-bg);
    color: var(--text-dark);
    line-height: 1.6;
}

.nav-bar {
    background-color: var(--night-blue);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-bar h1 {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

.btn-logout {
    background-color: var(--red-action);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s;
}

.btn-logout:hover {
    background-color: #c82333;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.auth-container {
    max-width: 450px;
    margin: 4rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.auth-container h2 {
    color: var(--night-blue);
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-gray);
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--night-blue);
}

.phone-input {
    display: flex;
    gap: 0.5rem;
}

.phone-input select {
    width: 120px;
}

.phone-input input {
    flex: 1;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--night-blue);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background-color: #0f1720;
}

.btn-danger {
    background-color: var(--red-action);
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-success {
    background-color: var(--success-green);
    color: white;
}

.btn-success:hover {
    background-color: #218838;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-left: 4px solid var(--yellow-indicator);
}

.stat-card.income {
    border-left-color: var(--success-green);
}

.stat-card.expense {
    border-left-color: var(--red-action);
}

.stat-card h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.stat-card .amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--night-blue);
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 1.5rem;
}

.card h2 {
    color: var(--night-blue);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table thead {
    background-color: var(--light-gray);
}

table th,
table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-gray);
}

table th {
    font-weight: 600;
    color: var(--night-blue);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-success {
    background-color: #d4edda;
    color: #155724;
}

.badge-warning {
    background-color: var(--yellow-indicator);
    color: #856404;
}

.badge-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.text-center {
    text-align: center;
}

.text-link {
    color: var(--night-blue);
    text-decoration: none;
    font-size: 0.9rem;
}

.text-link:hover {
    text-decoration: underline;
}

.demo-banner {
    background-color: var(--yellow-indicator);
    color: #856404;
    padding: 0.75rem;
    text-align: center;
    font-weight: 600;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    color: var(--night-blue);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .nav-bar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .auth-container {
        margin: 2rem auto;
        padding: 1.5rem;
    }

    .container {
        margin: 1rem auto;
    }

    table {
        font-size: 0.85rem;
    }

    table th,
    table td {
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .phone-input {
        flex-direction: column;
    }

    .phone-input select {
        width: 100%;
    }
}