/* ============================================
   CSS Variables & Reset (inherit from main)
   ============================================ */
:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --shadow: rgba(0, 0, 0, 0.5);
    --border-color: rgba(255, 255, 255, 0.15);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --shadow: rgba(0, 0, 0, 0.1);
    --border-color: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', 'Noto Sans KR', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    text-decoration: none;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-primary);
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */
.models-hero {
    padding: 150px var(--spacing-md) 80px;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.models-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.models-hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ============================================
   Main Layout
   ============================================ */
.models-main {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-md);
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 60vh;
}

/* ============================================
   Filters Sidebar
   ============================================ */
.filters-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.filter-section {
    background: var(--bg-card);
    border-radius: 15px;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
}

.filter-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.category-filters,
.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* ============================================
   Models Content
   ============================================ */
.models-content {
    display: flex;
    flex-direction: column;
}

.models-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.models-count {
    color: var(--text-secondary);
}

.sort-options select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    cursor: pointer;
}

/* ============================================
   Models Grid
   ============================================ */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.model-card {
    background: var(--bg-card);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
    border-color: var(--accent-primary);
}

.model-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--bg-secondary);
}

.model-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.model-card:hover .model-thumbnail img {
    transform: scale(1.05);
}

.model-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 0.3rem 0.8rem;
    background: var(--accent-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
}

.model-info {
    padding: var(--spacing-sm);
}

.model-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.model-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.model-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.model-tag {
    padding: 0.2rem 0.6rem;
    background: rgba(102, 126, 234, 0.2);
    color: var(--accent-primary);
    font-size: 0.75rem;
    border-radius: 10px;
}

/* ============================================
   Loading Indicator
   ============================================ */
.loading-indicator {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
}

.loading-indicator.show {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-sm);
}

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

/* ============================================
   Modal
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: 20px;
    max-width: 1200px;
    width: 95%;
    max-height: 90vh;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--bg-secondary);
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--accent-primary);
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 350px;
    height: 80vh;
}

.viewer-container {
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

model-viewer {
    width: 100%;
    height: 100%;
}

.model-details {
    padding: var(--spacing-md);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.model-details h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.model-details p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.detail-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.detail-meta span {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 0.9rem;
}

.detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: auto;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--accent-primary);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.download-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

.download-btn.secondary {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.download-btn.secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: transparent;
}

/* ============================================
   Advertisement
   ============================================ */
.ad-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: var(--spacing-sm);
    text-align: center;
}

.ad-container::before {
    content: '광고';
    display: block;
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    opacity: 0.6;
}

.ad-header {
    max-width: 1200px;
    margin: 0 auto var(--spacing-md);
}

.ad-sidebar-models {
    margin-top: var(--spacing-md);
}

.ad-before-footer {
    max-width: 1200px;
    margin: var(--spacing-lg) auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .models-main {
        grid-template-columns: 1fr;
    }

    .filters-sidebar {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .filter-section {
        flex: 1;
        min-width: 200px;
    }

    .modal-body {
        grid-template-columns: 1fr;
        height: auto;
        max-height: 90vh;
    }

    .viewer-container {
        height: 50vh;
    }
}

@media (max-width: 768px) {
    .models-hero h1 {
        font-size: 2rem;
    }

    .nav-menu {
        gap: var(--spacing-sm);
    }

    .models-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .ad-sidebar-models {
        display: none;
    }
}

@media (max-width: 480px) {
    .models-hero {
        padding: 120px var(--spacing-sm) 60px;
    }

    .models-hero h1 {
        font-size: 1.75rem;
    }

    .filter-section {
        min-width: 100%;
    }

    .models-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
}