:root {
    --tg-bg: var(--tg-theme-bg-color, #ffffff);
    --tg-text: var(--tg-theme-text-color, #222222);
    --tg-hint: var(--tg-theme-hint-color, #999999);
    --tg-link: var(--tg-theme-link-color, #2481cc);
    --tg-button: var(--tg-theme-button-color, #50a8eb);
    --tg-button-text: var(--tg-theme-button-text-color, #ffffff);
    --tg-secondary-bg: var(--tg-theme-secondary-bg-color, #f5f5f7);

    --success: #4caf50;
    --error: #f44336;
    --warning: #ff9800;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: var(--tg-bg);
    color: var(--tg-text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    overflow-x: hidden;
}

.app {
    max-width: 500px;
    margin: 0 auto;
    min-height: 100vh;
    background-color: var(--tg-bg);
    position: relative;
}

/* Header */
.header {
    background: var(--tg-secondary-bg);
    padding: 16px;
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

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

.logo {
        font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--tg-button) 0%, #ff8a8a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cart-icon {
    position: relative;
    cursor: pointer;
    padding: 8px;
    font-size: 24px;
    color: var(--tg-text);
}

.cart-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--tg-button);
    color: var(--tg-button-text);
    font-size: 12px;
    font-weight: bold;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* Categories */
.categories {
    display: flex;
    gap: 8px;
    padding: 16px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.categories::-webkit-scrollbar {
    display: none;
}

.category {
    background: var(--tg-secondary-bg);
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--tg-text);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
}

.category.active {
    background: var(--tg-button);
    color: var(--tg-button-text);
}

/* Cakes Grid */
.cakes-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 16px;
}

.cake-card {
    background: var(--tg-secondary-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
    animation: fadeIn 0.3s ease;
}

.cake-card:active {
    transform: scale(0.98);
}

.cake-image {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    background: linear-gradient(45deg, #f3f3f3, #e9e9e9);
}

.cake-info {
    padding: 12px;
}

.cake-name {
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 16px;
}

.cake-weight {
    font-size: 13px;
    color: var(--tg-hint);
    margin-bottom: 8px;
}

.cake-price-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}

.cake-price {
    font-weight: 700;
    color: var(--tg-button);
    font-size: 18px;
}

.add-to-cart {
    background: var(--tg-button);
    color: var(--tg-button-text);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.add-to-cart:active {
    transform: scale(0.9);
}

.add-to-cart.added {
    background: var(--success);
}

/* Cart Panel */
.cart-panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--tg-bg);
    box-shadow: var(--shadow);
    transition: right 0.3s ease;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.cart-panel.open {
    right: 0;
}

.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--tg-secondary-bg);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.close-cart {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--tg-hint);
    cursor: pointer;
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.cart-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--tg-secondary-bg);
    border-radius: 12px;
    margin-bottom: 8px;
    animation: slideIn 0.2s ease;
}

.cart-item-image {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    object-fit: cover;
}

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

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

.cart-item-price {
    color: var(--tg-button);
    font-weight: 500;
}

.remove-item {
    background: none;
    border: none;
    color: var(--error);
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
}

.cart-footer {
    padding: 16px;
    background: var(--tg-secondary-bg);
    border-top: 1px solid rgba(0,0,0,0.05);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 12px;
}

.checkout-btn {
    width: 100%;
    padding: 14px;
    background: var(--tg-button);
    color: var(--tg-button-text);
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.checkout-btn:active {
    opacity: 0.8;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.open {
    display: flex;
}

.modal-content {
    background: var(--tg-bg);
    border-radius: 24px;
    max-width: 90%;
    width: 450px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--tg-secondary-bg);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.close-modal {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--tg-hint);
    cursor: pointer;
}

/* Order Form */
.order-form {
    padding: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.form-group.half {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--tg-text);
    font-size: 14px;
}

input, textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid transparent;
    border-radius: 12px;
    background: var(--tg-secondary-bg);
    color: var(--tg-text);
    font-size: 16px;
    transition: border-color 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--tg-button);
}

input.error, textarea.error {
    border-color: var(--error);
}

.order-summary {
    background: var(--tg-secondary-bg);
    padding: 16px;
    border-radius: 12px;
    margin: 20px 0;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
}

.summary-total {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(0,0,0,0.1);
    font-weight: 700;
    font-size: 16px;
}

.submit-order {
    width: 100%;
    padding: 16px;
    background: var(--tg-button);
    color: var(--tg-button-text);
    border: none;
    border-radius: 12px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.submit-order:active {
    transform: scale(0.98);
}

.submit-order:disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3000;
    width: 90%;
    max-width: 400px;
}

.toast {
    background: var(--tg-secondary-bg);
    color: var(--tg-text);
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 8px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideUp 0.3s ease;
    border-left: 4px solid var(--tg-button);
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--error);
}

.toast.warning {
    border-left-color: var(--warning);
}

/* Loading */
.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--tg-hint);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-left: 8px;
    border: 2px solid var(--tg-hint);
    border-top-color: var(--tg-button);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Empty cart */
.empty-cart {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--tg-hint);
    text-align: center;
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

/* Responsive */
@media (max-width: 380px) {
    .cakes-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .logo {
        font-size: 18px;
    }
}

/* Dark theme optimizations */
@media (prefers-color-scheme: dark) {
    .cake-card {
        background: var(--tg-secondary-bg);
    }

    input, textarea {
        background: var(--tg-secondary-bg);
    }
}