:root {
    --primary: #D32F2F; /* Türk Bayrağı Kırmızısı, Ömer Aybak Kırmızısı */
    --primary-light: #FF6659;
    --primary-dark: #9A0007;
    --secondary: #1E1E1E;
    --bg-color: #F8F9FA;
    --sidebar-bg: #FFFFFF;
    --surface: #FFFFFF;
    --text-main: #333333;
    --text-muted: #6C757D;
    --text-light: #FFFFFF;
    --border: #E0E0E0;
    --success: #28a745;
    --danger: #dc3545;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.brand {
    padding: 30px 20px;
    text-align: center;
    border-bottom: 2px solid var(--bg-color);
}

.brand-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.brand h2 {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.brand p {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}

.nav-links {
    list-style: none;
    padding: 20px 0;
    flex-grow: 1;
}

.nav-links li {
    padding: 15px 25px;
    margin: 5px 15px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-links li i {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.nav-links li:hover {
    background-color: rgba(211, 47, 47, 0.05);
    color: var(--primary);
}

.nav-links li.active {
    background-color: var(--primary);
    color: var(--text-light);
    box-shadow: var(--shadow-sm);
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 30px 40px;
    position: relative;
}

.view-section {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.view-section.active {
    display: block;
}

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.section-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary);
}

.date-display {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 1.1rem;
}

/* Utilities */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: 0 4px 8px rgba(211,47,47,0.3);
}

.btn-secondary {
    background-color: var(--bg-color);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: #E2E6EA;
}

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-large {
    padding: 14px 20px;
    font-size: 1.05rem;
    width: 100%;
}

.btn-icon {
    padding: 8px;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Sales View */
.sales-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 30px;
    height: calc(100vh - 140px);
}

.products-grid-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    padding-right: 10px;
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 15px;
    align-content: start;
}

.product-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 20px 15px;
    text-align: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 160px;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(211, 47, 47, 0.3);
}

.product-card:active {
    transform: translateY(0);
}

.product-icon {
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: 10px;
}

.product-name {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 5px;
    color: var(--secondary);
}

.product-price {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Cart */
.cart-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.cart-container h2 {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    font-size: 1.2rem;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.empty-cart-msg {
    text-align: center;
    color: var(--text-muted);
    margin-top: 50px;
    font-style: italic;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 10px;
    border-bottom: 1px solid var(--border);
    animation: fadeIn 0.3s ease;
}

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

.cart-item-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.cart-item-price {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.qty-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: var(--bg-color);
    color: var(--text-main);
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.cart-item-qty {
    font-weight: 600;
    width: 25px;
    text-align: center;
}

.cart-summary {
    padding: 20px;
    background-color: #fafafa;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.total-price {
    color: var(--primary);
    font-size: 1.6rem;
}

/* Tables */
.table-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

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

.data-table th, .data-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background-color: #fafafa;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background-color: rgba(248, 249, 250, 0.8);
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-outline {
    border: 1px solid var(--primary);
    color: var(--primary);
}

.actions-cell {
    display: flex;
    gap: 8px;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-small {
    max-width: 400px;
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.close-modal:hover {
    color: var(--danger);
}

.modal-body {
    padding: 25px;
}

form .form-group {
    margin-bottom: 20px;
}

form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--secondary);
    font-size: 0.9rem;
}

form input, form select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

form input:focus, form select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(211,47,47,0.1);
}

.form-row {
    display: flex;
    gap: 15px;
}

.form-row .form-group {
    flex: 1;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 30px;
}

/* Report Cards */
.report-summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 25px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 20px;
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(211,47,47,0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.card-details h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
    font-weight: 500;
}

.card-details h2 {
    font-size: 1.8rem;
    font-weight: 700;
}

.text-primary { color: var(--primary); }
.mt-2 { margin-top: 10px; }
.mt-4 { margin-top: 25px; }
.mb-3 { margin-bottom: 15px; }
.font-bold { font-weight: 700; }

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: #f1f1f1; 
}
::-webkit-scrollbar-thumb {
    background: #ccc; 
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #aaa; 
}

/* Toast Container */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--surface);
    color: var(--text-main);
    padding: 15px 25px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInRight 0.3s forwards;
    border-left: 4px solid var(--primary);
    font-weight: 500;
}

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

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* Sidebar Footer - Logout */
.sidebar-footer {
    padding: 20px 15px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.btn-logout {
    width: 100%;
    padding: 12px 20px;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.btn-logout:hover {
    background-color: rgba(220, 53, 69, 0.08);
    color: var(--danger);
    border-color: var(--danger);
}