/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: tra;
    color: #ffffff;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(10px, 2vw, 30px);
}

/* Main Container - Adaptive Sizing */
.blackmarket-container {
    width: clamp(320px, 95vw, 1600px);
    height: clamp(600px, 90vh, 1000px);
    background: #0a0a0a;
    border: 1px solid #1f1f1f;
    border-radius: clamp(12px, 1.5vw, 20px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    animation: slideIn 0.4s ease-out;
    overflow: hidden;
    position: relative;
}

.blackmarket-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, transparent 50%, rgba(255, 255, 255, 0.02) 100%);
    pointer-events: none;
    border-radius: inherit;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Header - Responsive */
.header {
    background: linear-gradient(135deg, #111111 0%, #0d0d0d 100%);
    padding: clamp(16px, 2.5vw, 28px) clamp(20px, 3vw, 40px);
    border-bottom: 1px solid #1f1f1f;
    border-radius: clamp(11px, 1.4vw, 19px) clamp(11px, 1.4vw, 19px) 0 0;
    flex-shrink: 0;
    position: relative;
    z-index: 2;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: clamp(8px, 1.2vw, 16px);
}

.logo-icon {
    font-size: clamp(1.5rem, 2.5vw, 2.5rem);
    color: #ffffff;
    transition: transform 0.3s ease;
}

.logo h1 {
    font-size: clamp(1.2rem, 2.2vw, 2.2rem);
    font-weight: 700;
    letter-spacing: clamp(0.5px, 0.15vw, 2px);
    color: #ffffff;
    text-transform: uppercase;
}

.player-info {
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.5vw, 24px);
}

.balance {
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 12px);
    background: rgba(255, 255, 255, 0.05);
    padding: clamp(10px, 1.2vw, 16px) clamp(14px, 1.8vw, 24px);
    border-radius: clamp(6px, 0.8vw, 12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: clamp(0.9rem, 1.1vw, 1.2rem);
    font-weight: 600;
}

.money-icon {
    color: #4CAF50;
    font-size: clamp(1rem, 1.2vw, 1.3rem);
}

.close-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    width: clamp(36px, 4vw, 48px);
    height: clamp(36px, 4vw, 48px);
    border-radius: clamp(6px, 0.8vw, 12px);
    font-size: clamp(1rem, 1.2vw, 1.4rem);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
}

/* Navigation Tabs - Responsive */
.nav-tabs {
    display: flex;
    background: #080808;
    border-bottom: 1px solid #1f1f1f;
    flex-shrink: 0;
    position: relative;
    z-index: 2;
}

.tab-btn {
    flex: 1;
    padding: clamp(14px, 2vw, 24px) clamp(8px, 1.5vw, 20px);
    background: transparent;
    border: none;
    color: #666666;
    font-size: clamp(0.8rem, 1vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(4px, 0.8vw, 10px);
    border-bottom: 3px solid transparent;
    position: relative;
    min-height: clamp(50px, 6vw, 70px);
}

.tab-btn span {
    display: block;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.03);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tab-btn:hover::before {
    opacity: 1;
}

.tab-btn:hover {
    color: #ffffff;
}

.tab-btn.active {
    color: #ffffff;
    border-bottom-color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn i {
    font-size: clamp(1rem, 1.2vw, 1.3rem);
}

/* Content Area - Responsive */
.content-area {
    flex: 1;
    padding: clamp(16px, 3vw, 40px);
    overflow: hidden;
    background: #000000;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

.tab-content {
    display: none;
    height: 100%;
    flex-direction: column;
}

.tab-content.active {
    display: flex;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Category Header - Responsive */
.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: clamp(20px, 3vw, 32px);
    padding-bottom: clamp(12px, 2vw, 20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
    flex-wrap: wrap;
    gap: clamp(12px, 2vw, 20px);
}

.category-header h2 {
    font-size: clamp(1.2rem, 1.8vw, 1.8rem);
    color: #ffffff;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: clamp(8px, 1vw, 14px);
}

.category-header h2 i {
    color: #ffffff;
    font-size: clamp(1rem, 1.4vw, 1.6rem);
}

.search-bar {
    display: flex;
    gap: clamp(6px, 1vw, 12px);
    flex-shrink: 0;
}

.search-bar input {
    padding: clamp(10px, 1.5vw, 16px) clamp(12px, 1.8vw, 20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: clamp(6px, 1vw, 12px);
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-size: clamp(0.8rem, 1vw, 1rem);
    width: clamp(200px, 20vw, 320px);
    transition: all 0.3s ease;
}

.search-bar input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.search-bar input::placeholder {
    color: #777777;
}

.search-btn {
    padding: clamp(10px, 1.5vw, 16px) clamp(12px, 1.8vw, 20px);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: clamp(6px, 1vw, 12px);
    color: #ffffff;
    font-size: clamp(0.8rem, 1vw, 1rem);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: clamp(40px, 5vw, 60px);
}

.search-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: scale(1.02);
}

/* Items Grid - Fully Responsive */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(250px, 25vw, 320px), 1fr));
    gap: clamp(16px, 2vw, 28px);
    flex: 1;
    overflow-y: auto;
    padding-right: clamp(4px, 0.8vw, 12px);
    align-content: start;
}

.items-grid::-webkit-scrollbar {
    width: clamp(6px, 0.8vw, 10px);
}

.items-grid::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: clamp(3px, 0.4vw, 5px);
}

.items-grid::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: clamp(3px, 0.4vw, 5px);
}

.items-grid::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Item Cards - Fully Responsive */
.item-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.03) 100%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: clamp(10px, 1.2vw, 16px);
    padding: clamp(16px, 2.5vw, 28px);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    height: fit-content;
    min-height: clamp(200px, 25vh, 300px);
    display: flex;
    flex-direction: column;
}

.item-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.08), transparent);
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
    transition: transform 0.6s ease;
    opacity: 0;
}

.item-card:hover::before {
    opacity: 1;
    transform: translateX(100%) translateY(100%) rotate(45deg);
}

.item-card:hover {
    border-color: rgba(255, 255, 255, 0.25);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.06) 100%);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.item-image {
    text-align: center;
    margin-bottom: clamp(12px, 2vw, 20px);
    font-size: clamp(2rem, 3.5vw, 3.5rem);
    color: #ffffff;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.item-image i {
    transition: transform 0.3s ease;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.1));
}

.item-card:hover .item-image i {
    transform: scale(1.1);
}

.item-name {
    font-size: clamp(1rem, 1.4vw, 1.4rem);
    font-weight: 700;
    margin-bottom: clamp(6px, 1vw, 12px);
    color: #ffffff;
    text-align: center;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.item-description {
    font-size: clamp(0.8rem, 1vw, 1rem);
    color: #aaaaaa;
    margin-bottom: clamp(12px, 2vw, 20px);
    text-align: center;
    line-height: 1.5;
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.item-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: clamp(12px, 2vw, 20px);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    margin-top: auto;
}

.item-price {
    font-size: clamp(1rem, 1.3vw, 1.3rem);
    font-weight: 700;
    color: #4CAF50;
    text-shadow: 0 0 8px rgba(76, 175, 80, 0.3);
}

.item-stock {
    font-size: clamp(0.7rem, 0.9vw, 0.9rem);
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
    padding: clamp(4px, 0.6vw, 8px) clamp(6px, 1vw, 12px);
    border-radius: clamp(4px, 0.6vw, 8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-weight: 500;
    white-space: nowrap;
}

.item-stock.low {
    color: #ff9800;
    border-color: rgba(255, 152, 0, 0.4);
    background: rgba(255, 152, 0, 0.15);
}

.item-stock.out {
    color: #f44336;
    border-color: rgba(244, 67, 54, 0.4);
    background: rgba(244, 67, 54, 0.15);
}

.item-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.item-card.disabled:hover {
    border-color: rgba(255, 255, 255, 0.12);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.03) 100%);
    box-shadow: none;
}

/* Modal Styles - Responsive */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    padding: clamp(10px, 2vw, 30px);
}

.modal-content {
    background: linear-gradient(135deg, #111111 0%, #0a0a0a 100%);
    margin: clamp(20px, 5vh, 80px) auto;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: clamp(12px, 1.5vw, 20px);
    width: clamp(320px, 90vw, 650px);
    max-height: 90vh;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.8);
    animation: modalSlideIn 0.3s ease;
    overflow: hidden;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-40px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    background: rgba(255, 255, 255, 0.05);
    padding: clamp(16px, 2.5vw, 28px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: clamp(1.1rem, 1.5vw, 1.5rem);
    font-weight: 600;
    color: #ffffff;
}

.modal-close {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #cccccc;
    font-size: clamp(1rem, 1.2vw, 1.3rem);
    cursor: pointer;
    transition: all 0.3s ease;
    width: clamp(28px, 3.5vw, 40px);
    height: clamp(28px, 3.5vw, 40px);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: clamp(6px, 0.8vw, 10px);
}

.modal-close:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: clamp(16px, 3vw, 32px);
    max-height: 60vh;
    overflow-y: auto;
}

.item-preview {
    display: flex;
    gap: clamp(16px, 2.5vw, 28px);
    margin-bottom: clamp(20px, 3vw, 32px);
    align-items: flex-start;
}

.modal .item-image {
    font-size: clamp(3rem, 4.5vw, 5rem);
    min-width: clamp(80px, 10vw, 120px);
    color: #ffffff;
    text-align: center;
    flex-shrink: 0;
}

.item-details {
    flex: 1;
    min-width: 0;
}

.item-details h4 {
    font-size: clamp(1.2rem, 1.6vw, 1.6rem);
    color: #ffffff;
    margin-bottom: clamp(8px, 1vw, 12px);
    font-weight: 600;
}

.item-details p {
    color: #aaaaaa;
    margin-bottom: clamp(14px, 2vw, 20px);
    line-height: 1.6;
    font-size: clamp(0.9rem, 1vw, 1rem);
}

.item-stats {
    display: flex;
    flex-direction: column;
    gap: clamp(8px, 1vw, 12px);
}

.stat {
    font-size: clamp(0.9rem, 1vw, 1rem);
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: clamp(8px, 1vw, 12px);
}

.stat i {
    width: clamp(16px, 2vw, 20px);
    color: #aaaaaa;
    flex-shrink: 0;
}

.purchase-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(16px, 2.5vw, 28px);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: clamp(8px, 1.2vw, 14px);
    margin-bottom: clamp(16px, 2.5vw, 28px);
    flex-wrap: wrap;
    gap: clamp(12px, 2vw, 20px);
}

.quantity-selector {
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.5vw, 18px);
}

.quantity-selector label {
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 10px);
    color: #ffffff;
    font-weight: 500;
    font-size: clamp(0.9rem, 1vw, 1rem);
}

.quantity-controls {
    display: flex;
    align-items: center;
    gap: clamp(8px, 1vw, 12px);
}

.qty-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    width: clamp(32px, 4vw, 42px);
    height: clamp(32px, 4vw, 42px);
    border-radius: clamp(6px, 0.8vw, 10px);
    font-size: clamp(0.9rem, 1vw, 1.1rem);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qty-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: scale(1.05);
}

#quantity {
    width: clamp(60px, 8vw, 80px);
    padding: clamp(8px, 1.2vw, 12px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: clamp(6px, 0.8vw, 10px);
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    text-align: center;
    font-size: clamp(0.9rem, 1.1vw, 1.1rem);
    font-weight: 600;
}

#quantity:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.total-price {
    font-size: clamp(1.1rem, 1.4vw, 1.4rem);
    color: #4CAF50;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 10px);
    text-shadow: 0 0 8px rgba(76, 175, 80, 0.3);
}

.modal-footer {
    padding: clamp(16px, 2.5vw, 28px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: flex-end;
    gap: clamp(10px, 1.5vw, 16px);
    background: rgba(255, 255, 255, 0.02);
    flex-wrap: wrap;
}

.btn {
    padding: clamp(10px, 1.5vw, 14px) clamp(16px, 2.5vw, 28px);
    border: none;
    border-radius: clamp(6px, 1vw, 12px);
    font-size: clamp(0.8rem, 1vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 10px);
    white-space: nowrap;
}

.btn-primary {
    background: #ffffff;
    color: #000000;
}

.btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

.btn-primary.disabled {
    background: #666666;
    color: #333333;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

/* Notifications - Responsive */
.notifications {
    position: fixed;
    top: clamp(20px, 3vw, 40px);
    right: clamp(20px, 3vw, 40px);
    z-index: 1100;
    max-width: clamp(280px, 35vw, 400px);
}

.notification {
    background: rgba(0, 0, 0, 0.95);
    color: #ffffff;
    padding: clamp(12px, 1.8vw, 18px) clamp(16px, 2.2vw, 22px);
    margin-bottom: clamp(8px, 1.2vw, 14px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: clamp(8px, 1.2vw, 14px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
    animation: slideInRight 0.3s ease;
    display: flex;
    align-items: center;
    gap: clamp(8px, 1.2vw, 14px);
    border-left: clamp(3px, 0.4vw, 5px) solid #ffffff;
    font-size: clamp(0.85rem, 1vw, 1rem);
}

.notification.success {
    border-left-color: #4CAF50;
}

.notification.success::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: #4CAF50;
}

.notification.error {
    border-left-color: #f44336;
}

.notification.error::before {
    content: '\f00d';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: #f44336;
}

.notification.info {
    border-left-color: #2196F3;
}

.notification.info::before {
    content: '\f05a';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: #2196F3;
}

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

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

/* Resolution-Specific Optimizations */

/* 4K (3840x2160) and larger */
@media (min-width: 2560px) {
    .blackmarket-container {
        max-width: 1800px;
        max-height: 1200px;
    }
    
    .items-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 32px;
        }
   
   .item-card {
       min-height: 350px;
   }
   
   .logo h1 {
       font-size: 2.8rem;
   }
   
   .category-header h2 {
       font-size: 2.2rem;
   }
}

/* 2K (2560x1440) */
@media (min-width: 1920px) and (max-width: 2559px) {
   .blackmarket-container {
       max-width: 1400px;
       max-height: 1000px;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
       gap: 28px;
   }
   
   .item-card {
       min-height: 320px;
   }
}

/* 1080p (1920x1080) */
@media (min-width: 1366px) and (max-width: 1919px) {
   .blackmarket-container {
       max-width: 1200px;
       max-height: 850px;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
       gap: 24px;
   }
   
   .item-card {
       min-height: 280px;
   }
   
   .tab-btn span {
       display: inline;
   }
}

/* 720p (1366x768) and smaller laptops */
@media (min-width: 1024px) and (max-width: 1365px) {
   .blackmarket-container {
       max-width: 1000px;
       max-height: 650px;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
       gap: 20px;
   }
   
   .item-card {
       min-height: 250px;
       padding: 18px;
   }
   
   .header {
       padding: 16px 24px;
   }
   
   .content-area {
       padding: 24px;
   }
}

/* Tablets and small screens */
@media (max-width: 1023px) {
   body {
       padding: 10px;
   }
   
   .blackmarket-container {
       width: 100vw;
       height: 100vh;
       border-radius: 0;
       max-width: none;
       max-height: none;
   }
   
   .header {
       padding: 14px 20px;
       border-radius: 0;
   }
   
   .logo h1 {
       font-size: 1.4rem;
       letter-spacing: 1px;
   }
   
   .logo-icon {
       font-size: 1.6rem;
   }
   
   .balance {
       padding: 8px 14px;
       font-size: 0.9rem;
   }
   
   .close-btn {
       width: 32px;
       height: 32px;
       font-size: 1rem;
   }
   
   .nav-tabs {
       flex-wrap: wrap;
   }
   
   .tab-btn {
       min-width: 50%;
       padding: 12px 8px;
       font-size: 0.85rem;
   }
   
   .tab-btn span {
       display: none;
   }
   
   .content-area {
       padding: 16px;
   }
   
   .category-header {
       flex-direction: column;
       align-items: flex-start;
       gap: 14px;
       margin-bottom: 20px;
   }
   
   .category-header h2 {
       font-size: 1.3rem;
   }
   
   .search-bar {
       width: 100%;
   }
   
   .search-bar input {
       flex: 1;
       min-width: 0;
       width: auto;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
       gap: 16px;
   }
   
   .item-card {
       min-height: 220px;
       padding: 14px;
   }
   
   .item-image {
       font-size: 2.2rem;
       margin-bottom: 12px;
   }
   
   .item-name {
       font-size: 1.1rem;
       margin-bottom: 6px;
   }
   
   .item-description {
       font-size: 0.8rem;
       margin-bottom: 12px;
   }
   
   .item-footer {
       padding-top: 12px;
       flex-direction: column;
       gap: 8px;
       align-items: center;
   }
   
   .item-price {
       font-size: 1.1rem;
   }
   
   .item-stock {
       font-size: 0.75rem;
   }
   
   /* Modal adjustments for tablets */
   .modal {
       padding: 5px;
   }
   
   .modal-content {
       width: 95vw;
       max-height: 95vh;
       margin: 2.5vh auto;
   }
   
   .modal-header {
       padding: 16px 20px;
   }
   
   .modal-body {
       padding: 20px;
       max-height: 70vh;
   }
   
   .item-preview {
       flex-direction: column;
       text-align: center;
       gap: 16px;
   }
   
   .modal .item-image {
       font-size: 3.5rem;
       min-width: auto;
   }
   
   .purchase-options {
       flex-direction: column;
       gap: 14px;
       padding: 16px;
   }
   
   .modal-footer {
       padding: 16px 20px;
       justify-content: center;
   }
   
   .btn {
       flex: 1;
       max-width: 120px;
       justify-content: center;
   }
}

/* Mobile phones */
@media (max-width: 767px) {
   .nav-tabs {
       overflow-x: auto;
       flex-wrap: nowrap;
   }
   
   .tab-btn {
       min-width: 25%;
       flex-shrink: 0;
       white-space: nowrap;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
       gap: 12px;
   }
   
   .item-card {
       min-height: 200px;
       padding: 12px;
   }
   
   .item-image {
       font-size: 2rem;
   }
   
   .item-name {
       font-size: 1rem;
   }
   
   .item-description {
       font-size: 0.75rem;
       line-height: 1.3;
   }
   
   .search-bar input {
       font-size: 0.85rem;
   }
   
   .notifications {
       top: 10px;
       right: 10px;
       left: 10px;
       max-width: none;
   }
   
   .notification {
       font-size: 0.8rem;
       padding: 10px 14px;
   }
}

/* Very small screens */
@media (max-width: 480px) {
   .logo h1 {
       font-size: 1.1rem;
   }
   
   .balance {
       font-size: 0.8rem;
       padding: 6px 10px;
   }
   
   .items-grid {
       grid-template-columns: 1fr;
       gap: 10px;
   }
   
   .item-card {
       min-height: 180px;
   }
   
   .category-header h2 {
       font-size: 1.1rem;
   }
   
   .modal-content {
       width: 98vw;
       margin: 1vh auto;
   }
   
   .qty-btn {
       width: 28px;
       height: 28px;
       font-size: 0.8rem;
   }
   
   #quantity {
       width: 50px;
       font-size: 0.9rem;
   }
}

/* Landscape orientation fixes for tablets */
@media (max-width: 1023px) and (orientation: landscape) {
   .blackmarket-container {
       height: 100vh;
   }
   
   .nav-tabs {
       flex-wrap: nowrap;
       overflow-x: auto;
   }
   
   .tab-btn {
       min-width: 25%;
       flex-shrink: 0;
   }
   
   .tab-btn span {
       display: inline;
       font-size: 0.8rem;
   }
   
   .content-area {
       padding: 16px 20px;
   }
   
   .items-grid {
       grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
   }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
   .item-image i {
       filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.2));
   }
   
   .blackmarket-container {
       border-width: 0.5px;
   }
   
   .item-card {
       border-width: 0.5px;
   }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
   * {
       animation-duration: 0.01ms !important;
       animation-iteration-count: 1 !important;
       transition-duration: 0.01ms !important;
   }
   
   .item-card::before {
       display: none;
   }
}

/* Dark mode support (for systems that support it) */
@media (prefers-color-scheme: dark) {
   /* Already dark by default, but can add specific adjustments */
   .blackmarket-container {
       background: #050505;
   }
}

/* Focus management for accessibility */
.tab-btn:focus,
.btn:focus,
.search-bar input:focus,
#quantity:focus,
.qty-btn:focus,
.close-btn:focus,
.modal-close:focus,
.search-btn:focus {
   outline: 2px solid rgba(255, 255, 255, 0.5);
   outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
   .item-card {
       border-color: rgba(255, 255, 255, 0.3);
   }
   
   .item-stock {
       border-color: rgba(255, 255, 255, 0.4);
   }
   
   .btn-primary {
       background: #ffffff;
       color: #000000;
       border: 2px solid #ffffff;
   }
}

/* Print styles (in case someone tries to print) */
@media print {
   .blackmarket-container {
       background: white;
       color: black;
       box-shadow: none;
       border: 1px solid black;
   }
   
   .close-btn,
   .search-btn,
   .btn {
       display: none;
   }
}

/* Utility Classes */
.hidden {
   display: none !important;
}

.disabled {
   opacity: 0.5 !important;
   cursor: not-allowed !important;
   pointer-events: none !important;
}

.sr-only {
   position: absolute;
   width: 1px;
   height: 1px;
   padding: 0;
   margin: -1px;
   overflow: hidden;
   clip: rect(0, 0, 0, 0);
   white-space: nowrap;
   border: 0;
}

/* Loading states */
.loading {
   opacity: 0.7;
   pointer-events: none;
}

.loading::after {
   content: '';
   position: absolute;
   top: 50%;
   left: 50%;
   width: 20px;
   height: 20px;
   margin: -10px 0 0 -10px;
   border: 2px solid rgba(255, 255, 255, 0.3);
   border-top-color: #ffffff;
   border-radius: 50%;
   animation: spin 1s linear infinite;
}

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

/* Custom scrollbar for all browsers */
* {
   scrollbar-width: thin;
   scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

/* Performance optimizations */
.item-card,
.modal-content,
.blackmarket-container {
   will-change: transform;
   backface-visibility: hidden;
   perspective: 1000px;
}

/* Ensure text remains readable during font load */
body {
   font-display: swap;
}