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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f8f9fa;
    line-height: 1.6;
}

.navbar {
    background-color: #343a40;
    padding: 0.75rem 0;
    position: relative;
}

.navbar .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    flex-wrap: wrap;
}

.navbar-brand {
    color: white;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: bold;
    flex-shrink: 0;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: #adb5bd;
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    transition: all 0.3s;
    font-size: 0.9rem;
    white-space: nowrap;
}

.nav-link:hover {
    color: white;
    background-color: #495057;
}

.user-info {
    color: #adb5bd;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.container {
    max-width: 1200px;
    margin: 1rem auto;
    padding: 0 1rem;
    width: 100%;
}

.alert {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
}

.card-header {
    padding: 1rem;
    background-color: #f8f9fa;
    border-bottom: 1px solid #dee2e6;
    border-radius: 8px 8px 0 0;
}

.card-body {
    padding: 1rem;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: -0.5rem;
}

.col-md-4 {
    flex: 0 0 100%;
    padding: 0.5rem;
}

.col-md-6 {
    flex: 0 0 100%;
    padding: 0.5rem;
}

.col-md-12 {
    flex: 0 0 100%;
    padding: 0.5rem;
}

.bg-primary {
    background-color: #007bff !important;
    color: white;
}

.bg-success {
    background-color: #28a745 !important;
    color: white;
}

.bg-warning {
    background-color: #ffc107 !important;
    color: white;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1rem;
    margin: 0.25rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
    text-align: center;
    min-width: 44px;
    min-height: 44px;
    line-height: 1.2;
}

.btn-primary {
    background-color: #007bff;
    color: white;
}

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

.btn-info {
    background-color: #17a2b8;
    color: white;
}

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

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

.btn:hover {
    opacity: 0.9;
}

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

.form-label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: bold;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-top: 1rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.table th,
.table td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
    font-size: 0.9rem;
    white-space: nowrap;
}

.table th {
    background-color: #f8f9fa;
    font-weight: bold;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table-striped tbody tr:nth-child(odd) {
    background-color: #f8f9fa;
}

h1, h2, h3, h4, h5 {
    margin-bottom: 1rem;
    color: #343a40;
}

.mt-4 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.gst-info {
    background-color: #e9ecef;
    padding: 0.5rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

/* Mobile Menu Styles */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .navbar .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .navbar-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }
    
    .navbar-nav {
        display: none;
        flex-direction: column;
        width: 100%;
        margin-top: 1rem;
        gap: 0;
    }
    
    .navbar-nav.show {
        display: flex;
    }
    
    .nav-link {
        padding: 0.75rem 0;
        border-bottom: 1px solid #495057;
        width: 100%;
    }
    
    .user-info {
        padding: 0.75rem 0;
        border-top: 1px solid #495057;
        width: 100%;
        margin-top: 0.5rem;
    }
    
    .container {
        padding: 0 0.75rem;
        margin: 0.5rem auto;
    }
    
    .card-body {
        padding: 0.75rem;
    }
    
    .btn {
        width: 100%;
        margin: 0.25rem 0;
    }
    
    .form-group {
        margin-bottom: 1.25rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .table th,
    .table td {
        padding: 0.4rem;
        font-size: 0.8rem;
    }
    
    .col-md-4, .col-md-6 {
        flex: 0 0 100%;
    }
}

/* Tablet Styles */
@media (min-width: 769px) and (max-width: 1024px) {
    .col-md-4 {
        flex: 0 0 50%;
    }
    
    .col-md-6 {
        flex: 0 0 100%;
    }
    
    .navbar-nav {
        gap: 0.25rem;
    }
    
    .nav-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.85rem;
    }
    
    .container {
        padding: 0 1.5rem;
    }
}

/* Desktop Styles */
@media (min-width: 1025px) {
    .col-md-4 {
        flex: 0 0 33.333333%;
    }
    
    .col-md-6 {
        flex: 0 0 50%;
    }
    
    .navbar-nav {
        gap: 1rem;
    }
    
    .container {
        margin: 2rem auto;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 48px;
        padding: 0.875rem 1rem;
    }
    
    .form-control {
        min-height: 48px;
        padding: 0.875rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .nav-link {
        min-height: 44px;
        padding: 0.75rem 1rem;
    }
}

/* Print styles */
@media print {
    .navbar,
    .btn,
    .mobile-menu-toggle {
        display: none !important;
    }
    
    .container {
        max-width: none;
        margin: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
}