/* CSS Variables */
:root {
    --color-dusk-blue: #355070;
    --color-dusty-lavender: #6D597A;
    --color-rosewood: #B56576;
    --color-light-coral: #E56B6F;
    --color-light-bronze: #EAAC8B;
    --color-white: #FFFFFF;
    --color-dark: #1a1a1a;
    --color-overlay: rgba(0, 0, 0, 0.85);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 0.875rem;
    --font-size-large: 1.25rem;
    --font-size-xl: 1.5rem;
    
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: #f5f5f5;
}

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

/* Header */
header {
    background: linear-gradient(135deg, var(--color-dusk-blue), var(--color-dusty-lavender));
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

header p {
    font-size: var(--font-size-large);
    opacity: 0.9;
}

/* Main Container */
main {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Loading & Error States */
.loading,
.error {
    text-align: center;
    padding: var(--spacing-xl);
    font-size: var(--font-size-large);
}

.error {
    color: var(--color-light-coral);
}

/* Masonry Gallery */
#gallery {
    column-gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Responsive Column Count */
@media (max-width: 639px) {
    #gallery {
        column-count: 1;
    }
}

@media (min-width: 640px) and (max-width: 1023px) {
    #gallery {
        column-count: 2;
    }
}

@media (min-width: 1024px) and (max-width: 1399px) {
    #gallery {
        column-count: 3;
    }
}

@media (min-width: 1400px) {
    #gallery {
        column-count: 4;
    }
}

/* Artwork Cards */
.artwork-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    break-inside: avoid;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    cursor: pointer;
}

.artwork-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.artwork-card img {
    width: 100%;
    height: auto;
    display: block;
}

.artwork-card-content {
    padding: var(--spacing-sm);
}

.artwork-card h3 {
    font-size: var(--font-size-large);
    color: var(--color-dusk-blue);
    margin-bottom: var(--spacing-xs);
}

.artwork-card-meta {
    font-size: var(--font-size-small);
    color: var(--color-dusty-lavender);
}

/* Lightbox */
#lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

#lightbox.hidden {
    display: none;
}

.lightbox-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
    cursor: pointer;
}

.lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    background: var(--color-white);
    border-radius: var(--border-radius);
    overflow: auto;
    z-index: 1001;
    display: flex;
    flex-direction: column;
}

.lightbox-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--color-light-coral);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1002;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: var(--color-rosewood);
    transform: scale(1.1);
}

.lightbox-image {
    width: 100%;
    height: auto;
    display: block;
}

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

.lightbox-title {
    font-size: var(--font-size-xl);
    color: var(--color-dusk-blue);
    margin-bottom: var(--spacing-sm);
}

.lightbox-meta {
    font-size: var(--font-size-large);
    color: var(--color-dusty-lavender);
    margin-bottom: var(--spacing-md);
}

.lightbox-description {
    color: var(--color-dark);
    line-height: 1.8;
}

.lightbox-description p {
    margin-bottom: var(--spacing-sm);
}

/* Prevent body scroll when lightbox is open */
body.lightbox-open {
    overflow: hidden;
}