:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a1f2e;
    --bg-card-hover: #232a3b;
    --bg-controls: #111827;
    --border: #2d3548;
    --border-hover: #4a5568;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #60a5fa;
    --accent-purple: #a78bfa;
    --accent-green: #4ade80;
    --accent-orange: #fb923c;
    --accent-pink: #f472b6;
    --accent-cyan: #22d3ee;
    --accent-red: #f87171;
    --accent-yellow: #fbbf24;
    --cat-trend: #f87171;
    --cat-prompt: #60a5fa;
    --cat-skill: #a78bfa;
    --cat-workflow: #4ade80;
    --cat-opensource: #fb923c;
    --cat-design: #f472b6;
    --cat-video: #22d3ee;
    --cat-asset: #fbbf24;
    --cat-contest: #e879f9;
    --cat-research: #94a3b8;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body.light {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --bg-controls: #ffffff;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

/* Scrollbar for dark mode */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary); 
}
::-webkit-scrollbar-thumb {
    background: var(--border); 
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover); 
}

/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Header */
#header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s, border-color 0.3s;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
}
.icon-btn:hover {
    background-color: var(--bg-card);
}

.login-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}
.login-btn:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

/* Stats Bar */
.stats-bar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    transition: background-color 0.3s, border-color 0.3s;
}

.stats-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 24px;
    white-space: nowrap;
}

.stat-total, .stat-category {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: transform 0.2s;
}
.stat-total:hover, .stat-category:hover {
    transform: translateY(-2px);
}

.stat-total .stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
}
.stat-total .stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 32px;
    background-color: var(--border);
}

.stats-categories {
    display: flex;
    gap: 20px;
}

.stat-category .stat-number {
    font-size: 1.125rem;
    font-weight: 600;
}
.stat-category .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Category Tabs */
.category-tabs {
    background-color: var(--bg-primary);
    position: sticky;
    top: 74px; /* below header */
    z-index: 90;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.category-tabs::-webkit-scrollbar {
    display: none;
}

.tabs-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 4px;
    padding: 0 20px;
    scroll-snap-type: x mandatory;
}

.tab {
    background: none;
    border: none;
    border-bottom: 4px solid transparent;
    color: var(--text-secondary);
    padding: 16px 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    scroll-snap-align: start;
    transition: all 0.2s;
    border-top-left-radius: var(--radius-sm);
    border-top-right-radius: var(--radius-sm);
}

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

.tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent-blue);
    background-color: rgba(96, 165, 250, 0.05);
}

/* Category Guide */
.category-guide {
    background-color: rgba(96, 165, 250, 0.1);
    border-left: 4px solid var(--accent-blue);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: fadeInUp 0.3s ease-out;
}
.category-guide .guide-text {
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Controls Bar */
.controls-bar {
    background-color: var(--bg-controls);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
    position: sticky;
    top: 132px;
    z-index: 80;
}

.controls-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

#search-input {
    width: 100%;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 12px 16px 12px 48px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
    transition: all 0.2s;
}

#search-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.2);
}

.search-clear {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
}
.search-clear:hover { color: var(--text-primary); }

.controls-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.platform-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.pill {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.pill:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}
.pill.active {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: #fff;
}

.sort-area {
    display: flex;
    align-items: center;
    gap: 16px;
}

#sort-select {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    outline: none;
    font-size: 0.875rem;
    cursor: pointer;
}

.result-count {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Main Content & Grid */
.main-content {
    min-height: 50vh;
}

.card-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 20px;
}

/* Card */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    animation: fadeInUp 0.4s ease-out backwards;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background-color: var(--bg-card-hover);
}

/* Card Category Borders */
.card[data-category="trend"] { border-left-color: var(--cat-trend); }
.card[data-category="prompt"] { border-left-color: var(--cat-prompt); }
.card[data-category="skill"] { border-left-color: var(--cat-skill); }
.card[data-category="workflow"] { border-left-color: var(--cat-workflow); }
.card[data-category="opensource"] { border-left-color: var(--cat-opensource); }
.card[data-category="design"] { border-left-color: var(--cat-design); }
.card[data-category="video"] { border-left-color: var(--cat-video); }
.card[data-category="asset"] { border-left-color: var(--cat-asset); }
.card[data-category="contest"] { border-left-color: var(--cat-contest); }
.card[data-category="research"] { border-left-color: var(--cat-research); }

.card-header, .card-meta, .card-footer, .card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.platform-badge {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}
.platform-badge::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: currentColor;
}

.category-badge {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}

.stars {
    color: var(--accent-yellow);
    font-weight: bold;
    font-size: 0.875rem;
}
.date {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.card-title {
    color: var(--accent-blue);
    font-size: 1.25rem;
    margin: 0;
    cursor: pointer;
}
.card-title:hover {
    text-decoration: underline;
}

.card-freshness {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    margin-bottom: 4px;
}

.badge-new { background: rgba(74,222,128,0.15); color: #4ade80; border: 1px solid rgba(74,222,128,0.3); }
.badge-fresh { background: rgba(96,165,250,0.1); color: #60a5fa; border: 1px solid rgba(96,165,250,0.2); }
.badge-stale { background: rgba(148,163,184,0.1); color: #94a3b8; border: 1px solid rgba(148,163,184,0.2); }

.desc-kr {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
}
.desc-en {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}
.card-tags span {
    background-color: rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
}

.card-footer {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.author {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.license-badge {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}
.license-free { background: rgba(74,222,128,0.15); color: #4ade80; }
.license-cc { background: rgba(251,191,36,0.15); color: #fbbf24; }
.license-nc { background: rgba(251,146,60,0.15); color: #fb923c; }
.license-paid { background: rgba(248,113,113,0.15); color: #f87171; }
.license-unknown { background: rgba(148,163,184,0.15); color: #94a3b8; }

.card-actions {
    gap: 8px;
    margin-top: 12px;
}

.btn-open, .btn-demo, .btn-fav {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
    font-weight: 500;
    border: none;
    transition: all 0.2s;
}

.btn-open {
    background-color: var(--accent-blue);
    color: #fff;
    flex: 1;
}
.btn-open:hover { background-color: #3b82f6; }

.btn-demo {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}
.btn-demo:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.btn-fav {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--accent-red);
    padding: 8px;
}
.btn-fav:hover {
    background-color: rgba(248,113,113,0.1);
}

/* Empty State & Loading */
.empty-state, .loading-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}
.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 1s linear infinite;
}

/* Modal */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    background-color: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    position: relative;
    text-align: center;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}
.modal-close {
    position: absolute;
    top: 16px; right: 16px;
    background: none; border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
}
.modal-content h2 {
    margin-bottom: 12px;
    color: var(--text-primary);
}
.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.9rem;
}
.google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 12px;
    background-color: #fff;
    color: #3c4043;
    border: 1px solid #dadce0;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, box-shadow 0.2s;
}
.google-btn:hover {
    background-color: #f8f9fa;
    box-shadow: 0 1px 3px rgba(60,64,67,0.3);
}
.modal-note {
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--accent-orange);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 32px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}
.footer-inner a {
    color: var(--accent-blue);
    text-decoration: none;
}
.footer-inner a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .controls-row {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .platform-filters {
        width: 100%;
    }
    
    .sort-area {
        width: 100%;
        justify-content: space-between;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    .subtitle {
        display: none;
    }
    .login-btn span {
        display: none;
    }
}