:root {
    --primary-blue: #1a73e8;
    --primary-dark: #1557b0;
    --secondary-blue: #e8f0fe;
    --success: #0f9d58;
    --warning: #f4b400;
    --danger: #db4437;
    --gray-light: #f8f9fa;
    --gray: #70757a;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    background: #f5f5f5;
    color: #333;
    font-size: 18px;
}

h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--primary-dark);
}

.login-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--gray);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

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

.btn-primary {
    background: var(--primary-blue);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.alert-danger {
    background: #fde8e8;
    color: var(--danger);
    border: 1px solid #fad1d1;
}
.form-extra {
    margin-top: 1rem;
    text-align: center;
}
.form-extra a {
    color: var(--primary-blue);
    text-decoration: none;
}

.transaction-sale { background: #fde8e8; }
.transaction-purchase { background: #e8f5e9; }
.transaction-transfer { background: #e8eaf6; }

/* Layout utilities */
.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 1.5rem;
}

.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #eee;
    background: var(--gray-light);
}

.card-body {
    padding: 1rem 1.25rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    border: 1px solid #dee2e6;
    text-align: left;
    font-size: 1rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

.main-nav {
    background: var(--primary-blue);
    color: #fff;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
}

.nav-links a {
    color: #fff;
    margin-left: 1rem;
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    text-decoration: underline;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-grid .form-group {
    display: flex;
    flex-direction: column;
}

/* Responsive styles */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    .nav-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-top: 0.5rem;
    }

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

    .table {
        display: block;
        overflow-x: auto;
    }

    .container {
        padding: 0 0.5rem;
    }
}