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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

nav {
    background: #2874f0;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav h2 {
    font-size: 1.5rem;
}

nav div {
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255,255,255,0.1);
}

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

.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: #2874f0;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #666;
}

.hint {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-left: 4px solid #2874f0;
}

.stat-card.positive {
    border-left-color: #28a745;
}

.stat-card.negative {
    border-left-color: #dc3545;
}

.stat-card h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.stat-card .amount {
    font-size: 2rem;
    font-weight: bold;
    color: #333;
}

.form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    max-width: 800px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2874f0;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: #2874f0;
    color: white;
}

.btn-primary:hover {
    background: #1e5bb8;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

.btn-success {
    background: #28a745;
    color: white;
}

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

.btn-danger {
    background: #dc3545;
    color: white;
}

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

table {
    width: 100%;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

thead {
    background: #2874f0;
    color: white;
}

th, td {
    padding: 1rem;
    text-align: left;
}

tbody tr {
    border-bottom: 1px solid #eee;
}

tbody tr:hover {
    background: #f8f9fa;
}

.positive {
    color: #28a745;
}

.negative {
    color: #dc3545;
}

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

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

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

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

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

.section h2 {
    margin-bottom: 1rem;
    color: #333;
}

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

.action-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.no-data {
    text-align: center;
    padding: 2rem;
    color: #666;
}

.no-data a {
    color: #2874f0;
    text-decoration: none;
}

.no-data a:hover {
    text-decoration: underline;
}

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

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav div {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    th, td {
        padding: 0.5rem;
    }
}