/*
 * Ethereal by Eva - Minimal Art E-Commerce
 * Clean black & white design - easy for artist to customize
 */

/* =============================================================================
   CSS VARIABLES - Easy customization point for artist
   ============================================================================= */

:root {
    /* Colors - Change these to customize the whole site */
    --color-primary: #000000;
    --color-secondary: #ffffff;
    --color-accent: #666666;
    --color-border: #e0e0e0;
    --color-background: #ffffff;
    --color-text: #000000;
    --color-text-light: #666666;
    --color-error: #cc0000;
    --color-success: #008800;
    
    /* Typography */
    --font-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}


/* =============================================================================
   RESET & BASE
   ============================================================================= */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}


/* =============================================================================
   TYPOGRAPHY
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--spacing-md);
}

.text-light {
    color: var(--color-text-light);
}

.text-center {
    text-align: center;
}


/* =============================================================================
   LAYOUT
   ============================================================================= */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

.section {
    margin-bottom: var(--spacing-3xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.section-header h2 {
    font-size: var(--font-size-lg);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.section-header a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.section-header a:hover {
    color: var(--color-text);
}


/* =============================================================================
   HEADER & NAVIGATION
   ============================================================================= */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 300;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav a {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.nav a:hover,
.nav a.active {
    border-bottom-color: var(--color-text);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.cart-link {
    position: relative;
    padding: var(--spacing-sm);
}

.cart-count {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--color-primary);
    color: var(--color-secondary);
    font-size: var(--font-size-xs);
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cart-count:empty,
.cart-count[data-count="0"] {
    display: none;
}


/* =============================================================================
   HERO
   ============================================================================= */

.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.hero h1 {
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

.hero p {
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}


/* =============================================================================
   PIECE GRID
   ============================================================================= */

.piece-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.piece-card {
    display: block;
    transition: transform var(--transition-normal);
}

.piece-card:hover {
    transform: translateY(-4px);
}

.piece-card-image {
    position: relative;
    aspect-ratio: 4 / 5;
    overflow: hidden;
    background-color: #f5f5f5;
    margin-bottom: var(--spacing-md);
}

.piece-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.piece-card:hover .piece-card-image img {
    transform: scale(1.05);
}

.piece-card-sold {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-secondary);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.piece-card-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.piece-card-title {
    font-size: var(--font-size-base);
    font-weight: 400;
}

.piece-card-price {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}


/* =============================================================================
   CATEGORY FILTERS
   ============================================================================= */

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.category-filter {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
    background-color: var(--color-background);
}

.category-filter:hover {
    border-color: var(--color-text);
}

.category-filter.active {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    border-color: var(--color-primary);
}


/* =============================================================================
   PIECE DETAIL PAGE
   ============================================================================= */

.piece-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.piece-gallery {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-xl));
    align-self: start;
}

.piece-gallery-main {
    aspect-ratio: 4 / 5;
    background-color: #f5f5f5;
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.piece-gallery-main img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.piece-gallery-thumbs {
    display: flex;
    gap: var(--spacing-sm);
}

.piece-gallery-thumb {
    width: 80px;
    height: 80px;
    background-color: #f5f5f5;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
    border: 2px solid transparent;
}

.piece-gallery-thumb:hover,
.piece-gallery-thumb.active {
    opacity: 1;
}

.piece-gallery-thumb.active {
    border-color: var(--color-primary);
}

.piece-gallery-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.piece-info {
    padding-top: var(--spacing-lg);
}

.piece-info h1 {
    font-size: var(--font-size-2xl);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

.piece-price {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
}

.piece-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.piece-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.piece-meta dt {
    display: inline;
    font-weight: 500;
}

.piece-meta dd {
    display: inline;
    margin-left: var(--spacing-xs);
    margin-right: var(--spacing-lg);
}


/* =============================================================================
   BUTTONS
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

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

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

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

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

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}


/* =============================================================================
   CART PAGE
   ============================================================================= */

.cart-empty {
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.cart-empty p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.cart-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-3xl);
}

.cart-items {
    border-top: 1px solid var(--color-border);
}

.cart-item {
    display: grid;
    grid-template-columns: 120px 1fr auto;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.cart-item-image {
    aspect-ratio: 1;
    background-color: #f5f5f5;
}

.cart-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cart-item-info h3 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.cart-item-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.cart-item-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: space-between;
}

.cart-item-price {
    font-size: var(--font-size-lg);
}

.cart-item-remove {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.cart-item-remove:hover {
    color: var(--color-error);
}

.cart-summary {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-xl));
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.cart-summary h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.cart-summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.cart-summary-row.total {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.cart-summary .btn {
    margin-top: var(--spacing-xl);
}


/* =============================================================================
   FOOTER
   ============================================================================= */

.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
    margin-top: auto;
}

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

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-text);
}


/* =============================================================================
   LOADING & EMPTY STATES
   ============================================================================= */

.loading {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-light);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: var(--spacing-sm);
    vertical-align: middle;
}

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

.empty-state {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-light);
}


/* =============================================================================
   RESPONSIVE
   ============================================================================= */

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }
    
    .nav {
        display: none; /* TODO: Add mobile menu */
    }
    
    .piece-detail {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .piece-gallery {
        position: static;
    }
    
    .cart-layout {
        grid-template-columns: 1fr;
    }
    
    .cart-item {
        grid-template-columns: 80px 1fr;
    }
    
    .cart-item-actions {
        grid-column: 1 / -1;
        flex-direction: row;
        justify-content: space-between;
        margin-top: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .piece-grid {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: var(--font-size-2xl);
    }
}