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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --bg-dark: #0a0a0a;
    --bg-card: #111111;
    --bg-secondary: #1a1a1a;
    --border: #222;
    --text-primary: #ffffff;
    --text-secondary: #888;
    --text-muted: #666;
    --orange: #ff6b35;
    --red: #ef4444;
    --green: #10b981;
    --grid-color: rgba(255, 255, 255, 0.03);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    min-height: 100vh;
    background-color: var(--bg-dark);
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    overflow-x: hidden;
    position: relative;
    padding-top: 80px;
}

/* Layered background for depth */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.4) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.35) 0%, transparent 30%),
        radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.3) 0%, transparent 35%);
    pointer-events: none;
    z-index: 0;
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.05);
    }
}

@keyframes gradientShift {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* Depth layer - subtle noise texture */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255, 255, 255, 0.01) 2px, rgba(255, 255, 255, 0.01) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(255, 255, 255, 0.01) 2px, rgba(255, 255, 255, 0.01) 4px);
    pointer-events: none;
    z-index: 0;
    opacity: 0.3;
}


.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-circle {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.3);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    box-shadow: 
        0 2px 10px rgba(0, 0, 0, 0.2),
        0 1px 0 rgba(255, 255, 255, 0.01) inset;
    animation: headerSlideDown 0.8s ease-out;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(59, 130, 246, 0.15) 50%, 
        transparent 100%);
    opacity: 0.3;
}

@keyframes headerSlideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.logo-icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
    display: block;
}

.logo-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav-links .nav-link,
.header .nav-links .nav-link,
.header-container .nav-links .nav-link {
    color: rgba(255, 255, 255, 0.7) !important;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 16px;
    overflow: hidden;
    border-radius: 6px;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

.nav-link::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 6px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.nav-links .nav-link:hover,
.header .nav-links .nav-link:hover,
.header-container .nav-links .nav-link:hover {
    color: rgba(255, 255, 255, 0.95) !important;
    transform: translateY(-1px);
}

.nav-links .nav-link.active,
.header .nav-links .nav-link.active,
.header-container .nav-links .nav-link.active {
    color: rgba(255, 255, 255, 0.95) !important;
}

.nav-link.active::after {
    opacity: 1;
}

.nav-link:hover::before {
    width: 60%;
}

.nav-link:hover::after {
    opacity: 1;
}

.nav-link.active {
    color: rgba(255, 255, 255, 0.95);
}

.nav-link.active::after {
    opacity: 1;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-balance {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.balance-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.balance-amount {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
}

.login-header-btn,
.topup-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.login-header-btn {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.login-header-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

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

.topup-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

/* Main Content */
.main-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 30px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.category-filter {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    padding: 0 20px;
}

.category-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 25px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.category-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.category-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

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

.price-range {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Products Grid */
.products-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.products-container .product-card {
    animation: fadeInUp 0.6s ease-out both;
}

.products-container .product-card:nth-child(1) {
    animation-delay: 0.3s;
}

.products-container .product-card:nth-child(2) {
    animation-delay: 0.4s;
}

.products-container .product-card:nth-child(3) {
    animation-delay: 0.5s;
}

.products-container .product-card:nth-child(4) {
    animation-delay: 0.6s;
}

.products-container .product-card:nth-child(5) {
    animation-delay: 0.7s;
}

.products-container .product-card:nth-child(6) {
    animation-delay: 0.8s;
}

.product-card {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.15);
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--red);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    z-index: 10;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

.product-image {
    width: 100%;
    height: 250px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
}

.product-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.product-info {
    padding: 20px;
}

.product-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.product-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
}

.product-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.buy-btn {
    width: 100%;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.buy-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary);
    color: var(--primary);
}

.stock-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 10px;
    flex-wrap: wrap;
}

.stock-info svg {
    width: 16px;
    height: 16px;
}

.stock-info .sales-count {
    color: var(--green);
    font-weight: 500;
    margin-left: 4px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: modalSlideIn 0.4s ease-out;
}

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

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.3s;
}

.close-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.modal-content h2 {
    margin-bottom: 30px;
    text-align: center;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 700;
}

.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.auth-tab {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.auth-form {
    animation: fadeIn 0.3s ease;
}

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

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.form-hint {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: var(--text-muted);
}

.error-message {
    color: var(--red);
    font-size: 12px;
    margin-top: 5px;
    display: none;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.purchase-details {
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
}

.purchase-details-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 16px;
}

.purchase-details-item:last-child {
    margin-bottom: 0;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 700;
    font-size: 18px;
}

.modal-actions {
    display: flex;
    gap: 15px;
}

.btn-primary,
.btn-secondary {
    flex: 1;
    padding: 15px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding-top: 140px;
    }

    .header-container {
        padding: 15px 20px;
        gap: 15px;
        flex-wrap: wrap;
    }

    .nav-links {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        gap: 15px;
        margin-top: 15px;
        padding-top: 15px;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-link {
        font-size: 13px;
        padding: 6px 12px;
    }

    .main-content {
        padding: 20px 20px;
    }

    .products-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .product-image {
        height: 180px;
    }

    .product-info {
        padding: 15px;
    }

    .product-name {
        font-size: 16px;
    }

    .product-price {
        font-size: 20px;
    }

    .page-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 15px;
        margin-top: 20px;
    }

    .page-title {
        font-size: 18px;
    }

    .price-range {
        font-size: 14px;
    }
}