/* ============ GLOBAL STYLES ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1b5e20;
    --primary-light: #4caf50;
    --primary-dark: #0d3817;
    --secondary-color: #ff9800;
    --danger-color: #f44336;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --info-color: #2196f3;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --background-color: #fafafa;
    --surface-color: #ffffff;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

.sidebar {
    width: 260px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo i {
    font-size: 24px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    display: flex;
    flex-direction: column;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.15);
    border-left-color: var(--secondary-color);
    color: white;
}

.nav-item i {
    width: 20px;
    text-align: center;
}

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

.top-bar {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.breadcrumb {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

#page-title {
    color: var(--primary-color);
}

.top-bar-actions {
    display: flex;
    gap: 16px;
    align-items: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.page-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============ BUTTONS ============ */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: #757575;
    color: white;
}

.btn-secondary:hover {
    background-color: #616161;
}

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

.btn-success:hover {
    background-color: #45a049;
}

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

.btn-danger:hover {
    background-color: #da190b;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* ============ FORMS ============ */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(27, 94, 32, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ============ TABLES ============ */
.table-responsive {
    background: var(--surface-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.table thead {
    background-color: var(--primary-color);
    color: white;
}

.table th {
    padding: 14px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.3px;
}

.table td {
    padding: 14px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.table tbody tr:hover {
    background-color: var(--background-color);
}

/* ============ DASHBOARD ============ */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 4px;
}

/* ============ PAGE HEADER ============ */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============ SALES PAGE ============ */
.sales-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.sales-form {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.bill-section {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.bill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

.bill-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
}

.bill-items {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 16px;
}

.bill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--background-color);
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 13px;
}

.bill-item-info {
    flex: 1;
}

.bill-item-name {
    font-weight: 600;
    color: var(--text-primary);
}

.bill-item-qty {
    font-size: 12px;
    color: var(--text-secondary);
}

.bill-item-total {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 80px;
    text-align: right;
}

.bill-item-remove {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
    font-size: 11px;
    margin-left: 8px;
}

.bill-summary {
    border-top: 2px solid var(--primary-color);
    padding-top: 16px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 14px;
}

.summary-row.total {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    padding: 12px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.summary-row .form-control {
    flex: 1;
    margin-left: 12px;
}

/* ============ PAYMENTS PAGE ============ */
.payments-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.payment-section {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.payment-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

/* ============ FILTER BAR ============ */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.filter-bar .form-control {
    max-width: 300px;
}

/* ============ LEDGER CONTAINER ============ */
.ledger-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.ledger-section {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.ledger-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.ledger-section .form-control {
    margin-bottom: 12px;
}

.ledger-section .btn {
    margin-right: 8px;
    margin-bottom: 8px;
}

/* ============ REPORTS PAGE ============ */
.reports-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.report-section {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.report-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.report-section .form-control {
    margin-bottom: 12px;
}

.report-result {
    margin-top: 16px;
    padding: 16px;
    background: var(--background-color);
    border-radius: 6px;
}

/* ============ SETTINGS PAGE ============ */
.settings-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.settings-section {
    background: var(--surface-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.settings-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

#logo-preview {
    max-width: 150px;
    max-height: 150px;
}

#logo-preview img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

/* ============ MODALS ============ */
.modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.modal-backdrop.active {
    display: block;
}

.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal.active {
    display: block;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ============ TOAST NOTIFICATIONS ============ */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
}

.toast {
    background: var(--surface-color);
    border-left: 4px solid var(--primary-color);
    border-radius: 6px;
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
    .sales-container,
    .payments-container,
    .ledger-container,
    .reports-container,
    .settings-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .nav-item {
        padding: 12px 16px;
        font-size: 13px;
    }
    
    .nav-item span {
        display: none;
    }
    
    .page-container {
        padding: 16px;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}