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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #acacb0;
    --accent: #0071e3;
    --accent-hover: #0077ED;
    --border: #d2d2d7;
    --border-light: #e5e5e5;
    --success: #34c759;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-light);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 52px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 24px;
}

.user-info a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: var(--transition);
}

.user-info a:hover {
    color: var(--accent);
}

.cart-wrapper {
    position: relative;
}

.cart-btn {
    background: transparent;
    color: var(--text-primary);
    border: none;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.cart-btn:hover {
    background: var(--bg-tertiary);
}

.cart-panel {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 340px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--border-light);
    padding: 20px;
    z-index: 1000;
}

.cart-panel.show {
    display: block;
}

.cart-panel h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.cart-items {
    max-height: 280px;
    overflow-y: auto;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
}

.cart-item:last-child {
    border-bottom: none;
}

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

.cart-item-name {
    font-size: 14px;
    font-weight: 500;
}

.cart-item-price {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.quantity-control {
    display: flex;
    align-items: center;
    gap: 8px;
}

.quantity-btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.quantity-input {
    width: 40px;
    height: 28px;
    text-align: center;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
}

.remove-btn {
    padding: 4px 10px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: var(--transition);
}

.remove-btn:hover {
    background: #ff3b30;
    color: white;
}

.empty-cart {
    text-align: center;
    padding: 32px 0;
    color: var(--text-tertiary);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    padding: 16px 0;
    border-top: 1px solid var(--border-light);
    font-size: 15px;
    font-weight: 500;
}

.cart-total-price {
    color: var(--accent);
}

.checkout-btn {
    width: 100%;
    background: var(--accent);
    color: white;
    border: none;
    padding: 14px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 12px;
}

.checkout-btn:hover {
    background: var(--accent-hover);
}

.main-content {
    background: var(--bg-primary);
    padding: 48px;
    margin: 24px auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    max-width: 1200px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 32px;
    font-size: 14px;
}

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-tertiary);
}

.category-list {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-item {
    padding: 10px 20px;
    background: var(--bg-tertiary);
    border-radius: 100px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid transparent;
}

.category-item:hover {
    background: var(--bg-primary);
    border-color: var(--text-primary);
}

.category-item.active {
    background: var(--text-primary);
    color: white;
}

.product-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 0;
    transition: var(--transition);
    overflow: hidden;
}

.product-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.product-thumb {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-tertiary);
}

.product-info {
    padding: 16px;
}

.product-name {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    display: block;
    margin-bottom: 8px;
    line-height: 1.3;
}

.product-name:hover {
    color: var(--accent);
}

.product-price {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.add-to-cart-btn {
    width: 100%;
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.add-to-cart-btn:hover {
    background: var(--accent-hover);
}

.form-container {
    max-width: 400px;
    margin: 80px auto;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: 48px 40px;
}

.form-title {
    font-size: 28px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.form-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    transition: var(--transition);
    background: var(--bg-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

.error-message {
    background: #fff5f5;
    color: #ff3b30;
    padding: 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid #ffdada;
}

.success-message {
    background: #f5fff5;
    color: #34c759;
    padding: 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid #d4f5d4;
}

.form-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
    padding-top: 16px;
}

.form-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.form-footer a:hover {
    text-decoration: underline;
    background: var(--bg-tertiary);
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 24px;
}

.product-image-section {
    position: relative;
}

.product-image-main {
    width: 100%;
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    aspect-ratio: 1;
    object-fit: contain;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
}

.slider-btn:hover {
    background: white;
    transform: translateY(-50%) scale(1.05);
}

.slider-btn-prev {
    left: 16px;
}

.slider-btn-next {
    right: 16px;
}

.product-detail-info {
    display: flex;
    flex-direction: column;
}

.product-detail-info h2 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    line-height: 1.2;
}

.product-detail-info .price {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 32px;
}

.product-detail-info .description {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.detail-section {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.detail-section h3 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

footer {
    background: var(--bg-tertiary);
    padding: 48px 0;
    margin-top: 80px;
    border-top: 1px solid var(--border-light);
}

footer p {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
}

.admin-panel {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px;
}

.admin-menu {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
}

.admin-menu a {
    padding: 12px 24px;
    background: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.admin-menu a:hover {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
}

.admin-section {
    background: var(--bg-primary);
    padding: 32px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
}

.admin-section h2 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

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

.admin-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.admin-table td {
    padding: 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border-light);
}

.admin-table tr:hover {
    background: var(--bg-secondary);
}

.admin-table .product-image {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-edit {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn-delete {
    background: #fff5f5;
    color: #ff3b30;
}

.btn-delete:hover {
    background: #ff3b30;
    color: white;
}

@media (max-width: 768px) {
    .main-content {
        padding: 24px;
        margin: 16px;
        border-radius: var(--radius-lg);
    }

    .product-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .product-detail {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .form-container {
        margin: 40px 20px;
        padding: 32px 24px;
    }

    .admin-panel {
        padding: 20px 16px;
    }

    .admin-menu {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .product-list {
        grid-template-columns: 1fr;
    }

    .category-list {
        gap: 6px;
    }

    .category-item {
        padding: 8px 16px;
        font-size: 13px;
    }
}