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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

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

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

/* Header */
.header {
    background: var(--gradient-1);
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: white;
}

.subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

#total-count {
    font-weight: 700;
    color: #fbbf24;
}

/* Search Section */
.search-section {
    padding: 30px 0;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.search-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    flex: 1;
    padding: 15px 20px;
    background-color: var(--surface-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-btn {
    padding: 15px 25px;
    background: var(--gradient-2);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.3rem;
    transition: transform 0.2s;
}

.search-btn:hover {
    transform: scale(1.05);
}

/* Filters */
.filters {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 20px;
    row-gap: 12px;
}

.filter-btn {
    padding: 12px 22px;
    background-color: var(--surface-light);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
    margin: 2px;
}

.filter-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.filter-btn.active {
    background: var(--gradient-2);
    border-color: var(--primary-color);
    color: white;
}

.stats {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 30px;
}

/* Main Content */
.main-content {
    padding: 0 0 40px 0;
    min-height: 60vh;
}

/* Fade in animation for cards */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* GPT Cards Grid */
.gpts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

.gpts-grid-continuous {
    margin-top: 0;
}

.gpt-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px;
    transition: all 0.3s;
    cursor: pointer;
    animation: fadeIn 0.5s ease-in;
}

.gpt-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

.gpt-category-tag {
    display: inline-block;
    background: var(--gradient-2);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.gpt-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gpt-description {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 60px;
}

.gpt-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.gpt-author {
    color: var(--text-muted);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.gpt-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 16px;
    background: var(--gradient-2);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s;
}

.gpt-link:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

/* No Results */
.no-results {
    text-align: center;
    padding: 80px 20px;
}

.no-results p {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.btn-primary {
    padding: 12px 30px;
    background: var(--gradient-2);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.4);
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
}

.footer p {
    margin: 5px 0;
}

.footer-note {
    font-size: 0.9rem;
    opacity: 0.7;
}

#total-gpts-footer {
    color: var(--primary-color);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .logo {
        font-size: 2rem;
    }
    
    .gpts-grid {
        grid-template-columns: 1fr;
    }
    
    .filters {
        max-height: 200px;
        overflow-y: auto;
        gap: 12px;
        row-gap: 10px;
    }
    
    .filter-btn {
        padding: 10px 18px;
        font-size: 0.85rem;
    }
    
    .category-title {
        font-size: 1.5rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Loading Animation */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.loading::after {
    content: '...';
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}