:root {
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #EEF2FF;
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-tap-highlight-color: transparent;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-spinner-large {
    width: 50px;
    height: 50px;
    border: 4px solid var(--primary-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

/* Shop Header */
.shop-header {
    position: relative;
    background: white;
}

.shop-cover {
    height: 200px;
    background-color: var(--primary-color);
    background-size: cover;
    background-position: center;
}

.btn-back-circle {
    position: absolute;
    top: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.shop-profile-section {
    margin-top: -40px;
    padding-bottom: 20px;
}

.shop-profile-row {
    display: flex;
    align-items: flex-end;
    gap: 16px;
}

.shop-logo {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-lg);
    border: 4px solid white;
    background: white;
    box-shadow: var(--shadow-md);
    object-fit: cover;
}

.shop-title-info {
    flex: 1;
    padding-bottom: 8px;
}

.shop-name {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 4px;
}

.shop-meta-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-verified {
    background: #D1FAE5;
    color: #059669;
}

.badge-category {
    background: var(--primary-light);
    color: var(--primary-color);
}

/* Tabs */
.shop-tabs {
    background: white;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 20;
}

.tabs-scroll {
    display: flex;
    gap: 24px;
}

.tab-btn {
    padding: 16px 4px;
    background: none;
    border: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

/* Tab Content */
.tab-content {
    display: none;
    padding: 20px 0 100px;
}

.tab-content.active {
    display: block;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.product-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

.product-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.product-info {
    padding: 12px;
}

.product-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price {
    font-weight: 700;
    color: var(--primary-color);
}

/* About Card */
.about-card {
    background: white;
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.about-card h3 {
    margin-bottom: 12px;
}

.contact-info {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

/* Fixed Action Bar */
.shop-actions {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px;
    background: white;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 10px rgba(0,0,0,0.05);
    z-index: 30;
}

.btn-contact-shop {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 16px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

@media (min-width: 768px) {
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}