/* ================================
   AI Prompt Gallery - Dark Theme
   ================================ */

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --success: #22c55e;
    --tag-bg: #334155;
    --tag-active-bg: #3b82f6;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    padding: 20px 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
}

.logo-icon {
    font-size: 32px;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--bg-secondary);
    transition: all 0.2s;
}

.back-link:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

/* Search Bar */
.search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.search-bar input {
    flex: 1;
    max-width: 400px;
    padding: 12px 20px;
    border: 1px solid var(--border);
    border-radius: 25px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.search-bar input:focus {
    border-color: var(--accent);
}

.search-bar input::placeholder {
    color: var(--text-secondary);
}

.search-bar button {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    background: var(--accent);
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.search-bar button:hover {
    background: var(--accent-hover);
}

.prompt-count {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Categories */
.categories {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-tag {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    background: var(--tag-bg);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.category-tag:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.category-tag.active {
    background: var(--tag-active-bg);
    color: white;
}

/* Gallery Grid - Masonry */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

/* Gallery Card */
.card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    break-inside: avoid;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card-image {
    width: 100%;
    display: block;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.card-content {
    padding: 16px;
}

.card-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.card-tag {
    font-size: 11px;
    padding: 4px 8px;
    background: var(--tag-bg);
    color: var(--text-secondary);
    border-radius: 4px;
}

/* Loading & No Results */
.loading,
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.no-results-icon {
    font-size: 48px;
    display: block;
    margin-bottom: 16px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    overflow-y: auto;
    padding: 40px 20px;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    max-width: 900px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    font-size: 24px;
    cursor: pointer;
    z-index: 10;
    transition: background 0.2s;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.7);
}

.modal-image-container {
    width: 100%;
    max-height: 500px;
    overflow: hidden;
}

.modal-image-container img {
    width: 100%;
    display: block;
}

.modal-details {
    padding: 24px;
}

.modal-details h2 {
    font-size: 20px;
    margin-bottom: 12px;
}

.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.modal-tag {
    font-size: 12px;
    padding: 6px 12px;
    background: var(--tag-bg);
    color: var(--text-secondary);
    border-radius: 6px;
}

/* Prompt Box */
.prompt-box {
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
}

.prompt-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-weight: 500;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: white;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--accent-hover);
}

.copy-btn.copied {
    background: var(--success);
}

.prompt-text {
    padding: 16px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .logo {
        font-size: 20px;
    }

    .search-bar {
        flex-wrap: wrap;
    }

    .search-bar input {
        max-width: 100%;
    }

    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }

    .modal-content {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}