:root {
    --bg-color: #0f0f11;
    --surface-color: #1a1a1c;
    --surface-hover: #232326;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent-color: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Noto Sans SC', 'Inter', sans-serif;
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Header */
.header {
    background: rgba(15, 15, 17, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 2rem 1rem;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.logo i {
    color: var(--accent-color);
    -webkit-text-fill-color: var(--accent-color);
    font-size: 1.8rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

/* Navigation Tags */
.tags-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.tag-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.tag-link:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
    transform: translateY(-1px);
}

.tag-link.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Main Gallery Area */
.gallery-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Masonry Grid */
.masonry-grid {
    margin: 0 -10px;
    /* Offset padding for grid items */
}

/* Clearfix for Masonry */
.masonry-grid::after {
    content: '';
    display: block;
    clear: both;
}

.masonry-item {
    float: left;
    width: calc(33.333% - 20px);
    margin: 10px;
    margin-bottom: 20px;
}

/* Responsive Grid */
@media (max-width: 1024px) {
    .masonry-item {
        width: calc(50% - 20px);
    }
}

@media (max-width: 600px) {
    .masonry-item {
        width: calc(100% - 20px);
    }
}

/* Cards */
.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.card-image-wrapper {
    position: relative;
    width: 100%;
    /* Keep intrinsic aspect ratio or default to min-height */
    min-height: 200px;
    background: #111;
    overflow: hidden;
}

.card-image {
    display: block;
    width: 100%;
    height: auto;
    transition: transform 0.5s ease;
}

.card:hover .card-image {
    transform: scale(1.03);
}

/* Hover Overlay for Copy Button */
.card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition-smooth);
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
}

.card:hover .card-overlay {
    opacity: 1;
}

.copy-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
}

.copy-btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* Card Content */
.card-content {
    padding: 1.25rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 1rem;
}

.tag {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

.card-prompt-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 5rem 1rem;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #10b981;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}