:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --text-primary: #e94560;
    --text-secondary: #eeeeee;
    --text-muted: #a0a0a0;
    --border-color: #2c3e50;
    --success: #00d68f;
    --danger: #ff4d4d;
    --warning: #ffaa00;
    --info: #17a2b8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px;
}

/* Header - Mobil Optimize */
header {
    background-color: var(--bg-secondary);
    padding: 12px 0;
    border-bottom: 2px solid var(--text-primary);
    margin-bottom: 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.navbar h1 {
    font-size: 1.4rem;
    margin: 0;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

/* Button Styles - Touch Friendly */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    background-color: var(--bg-card);
    color: var(--text-secondary);
    min-height: 44px;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.97);
}

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    min-height: 36px;
}

/* Card Styles */
.card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    transition: transform 0.2s ease;
}

.card-header {
    border-bottom: 2px solid var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
}

.card-header h2 {
    font-size: 1.4rem;
    word-break: break-word;
}

.card-header h3 {
    font-size: 1.2rem;
}

/* Form Styles - Touch Friendly */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 16px;
    transition: all 0.2s;
    -webkit-appearance: none;
}

.form-control:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(233,69,96,0.2);
}

/* Product Items - Touch Friendly */
.category {
    margin-bottom: 25px;
    background: var(--bg-secondary);
    border-radius: 14px;
    padding: 15px;
}

.category-title {
    font-size: 1.2rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.product-item {
    display: flex;
    align-items: center;
    padding: 14px 12px;
    margin-bottom: 8px;
    background-color: var(--bg-primary);
    border-radius: 12px;
    transition: background 0.2s;
    gap: 12px;
    cursor: pointer;
}

.product-item:active {
    background-color: #1e2a3a;
}

.product-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    margin: 0;
    flex-shrink: 0;
}

.product-name {
    flex: 1;
    font-size: 16px;
    font-weight: 500;
    word-break: break-word;
}

.product-unit {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 6px;
    white-space: nowrap;
}

.product-brand {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 6px;
}

.product-checked {
    text-decoration: line-through;
    opacity: 0.6;
}

/* Grid System - Responsive */
.row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

/* Stat Cards */
.stat-card {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
    padding: 18px;
    border-radius: 16px;
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 5px;
}

/* Alert Messages */
.alert {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 14px;
    animation: slideIn 0.3s ease;
}

.alert-success {
    background-color: rgba(0, 214, 143, 0.15);
    border-left: 4px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background-color: rgba(255, 77, 77, 0.15);
    border-left: 4px solid var(--danger);
    color: var(--danger);
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.15);
    border-left: 4px solid var(--info);
    color: var(--info);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    background-color: var(--text-primary);
    color: white;
    white-space: nowrap;
}

/* Search Input */
.search-input-wrapper {
    position: relative;
    width: 100%;
}

.search-input-wrapper input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border-radius: 30px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Search Results */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-radius: 16px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    margin-top: 8px;
}

.search-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px;
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
    flex-wrap: wrap;
}

/* Loading Animation */
.loading {
    text-align: center;
    padding: 40px;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid var(--text-primary);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.6s linear infinite;
}

/* Animations */
@keyframes slideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

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

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

/* AJAX işlemleri için loading efekti */
.product-item.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* Toast mesajları için animasyon */
@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    to {
        transform: translateX(-50%) translateY(100px);
        opacity: 0;
    }
}

/* ============================================
   MOBILE SPECIFIC STYLES
   ============================================ */

/* Tablet ve Mobil (max-width: 768px) */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .navbar {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }
    
    .navbar h1 {
        font-size: 1.3rem;
        white-space: normal;
    }
    
    .nav-links {
        justify-content: center;
        width: 100%;
        gap: 8px;
    }
    
    .btn {
        padding: 8px 14px;
        font-size: 13px;
        min-height: 40px;
    }
    
    .card {
        padding: 16px;
        border-radius: 14px;
    }
    
    .card-header h2 {
        font-size: 1.3rem;
    }
    
    .category {
        padding: 12px;
    }
    
    .category-title {
        font-size: 1.1rem;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .product-item {
        padding: 12px 10px;
        gap: 10px;
    }
    
    .product-checkbox {
        width: 22px;
        height: 22px;
    }
    
    .product-name {
        font-size: 15px;
    }
    
    .row {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 14px;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .form-control {
        padding: 12px;
        font-size: 16px;
    }
    
    .search-result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .quantity-selector {
        width: 100%;
        display: flex;
        justify-content: space-between;
    }
}

/* Küçük Mobil (max-width: 480px) */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .navbar h1 {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 7px 12px;
        font-size: 12px;
        min-height: 36px;
    }
    
    .btn-sm {
        padding: 5px 10px;
        font-size: 11px;
    }
    
    .card {
        padding: 14px;
    }
    
    .card-header h2 {
        font-size: 1.2rem;
    }
    
    .category-title {
        font-size: 1rem;
    }
    
    .product-item {
        padding: 10px 8px;
    }
    
    .product-name {
        font-size: 14px;
    }
    
    .product-unit, .product-brand {
        font-size: 10px;
    }
    
    .badge {
        font-size: 10px;
        padding: 3px 8px;
    }
    
    .alert {
        padding: 12px;
        font-size: 13px;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-control {
        padding: 10px 12px;
        font-size: 15px;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn, 
    .product-item,
    .search-result-item,
    input[type="checkbox"],
    select,
    button {
        cursor: default;
    }
    
    .btn:active {
        transform: scale(0.96);
    }
    
    .product-item:active {
        background-color: #1e2a3a;
    }
}

/* Landscape Mode */
@media (max-width: 900px) and (orientation: landscape) {
    .navbar {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .nav-links {
        width: auto;
    }
    
    .container {
        max-width: 100%;
    }
}

/* Dark Mode Support for iOS */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a2e;
        --bg-secondary: #16213e;
        --bg-card: #0f3460;
    }
}

/* Safe Area Insets (iPhone X ve üzeri) */
@supports (padding: max(0px)) {
    .container {
        padding-left: max(15px, env(safe-area-inset-left));
        padding-right: max(15px, env(safe-area-inset-right));
    }
    
    header {
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
    }
}