/* AI Enterprise Design System - Light Theme */
@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Thin.woff2') format('woff2');
    font-weight: 100;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-ExtraLight.woff2') format('woff2');
    font-weight: 200;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Light.woff2') format('woff2');
    font-weight: 300;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Regular.woff2') format('woff2');
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Medium.woff2') format('woff2');
    font-weight: 500;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Bold.woff2') format('woff2');
    font-weight: 700;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-ExtraBold.woff2') format('woff2');
    font-weight: 800;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Black.woff2') format('woff2');
    font-weight: 900;
    font-display: swap;
}

:root {
    /* Color Palette - Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;

    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;

    --accent-primary: #0066ff;
    /* Bright Blue */
    --accent-secondary: #4d94ff;
    /* Light Blue */
    --accent-glow: rgba(0, 102, 255, 0.2);

    --border-color: #dee2e6;
    --border-highlight: #adb5bd;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Spacing & Layout */
    --header-height: 70px;
    --container-width: 1400px;
    --grid-gap: 24px;

    /* Effects */
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: 1px solid rgba(0, 0, 0, 0.08);
    --glass-shadow: 0 2px 16px 0 rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: var(--glass-border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.site-logo {
    /* font-family: 'JetBrains Mono', monospace; */
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}



.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link.external-link::after {
    content: '\2197';
    font-size: 0.7rem;
    margin-left: 6px;
    display: inline-block;
    color: inherit;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.nav-link.external-link:hover::after,
.nav-link.external-link:focus-visible::after {
    opacity: 1;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Main Content */
main {
    
    padding-top: 60px;
    padding-bottom: 120px;
    min-height: calc(100vh - var(--header-height));
}

/* Hero / Search Section */
.hero-section {
    margin-bottom: 60px;
    text-align: center;
    padding-top: 40px;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
    margin-top: 50px;
    background: linear-gradient(135deg, #1a1a1a 0%, #0066ff 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.hero-subtitle {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.search-wrapper {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.search-input {
    width: 100%;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    padding: 20px 24px;
    padding-right: 60px;
    font-size: 1.1rem;
    color: var(--text-primary);
    font-family: 'KakaoBigFont', sans-serif;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--bg-primary);
}

.search-btn {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

/* Controls (Tabs) */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.category-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tab {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.tab.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Data Table */
.table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1rem;
}

thead th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 500;
    text-align: left;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

tbody td {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

tbody tr {
    transition: background 0.2s ease;
}

tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

tbody tr:hover {
    background: rgba(0, 102, 255, 0.04) !important;
}

tbody tr:last-child td {
    border-bottom: none;
}

/* File Type Badges */
.file-type-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    text-transform: uppercase;
}

.file-type-pdf {
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.3);
}

.file-type-hwp {
    color: #3b82f6;
    border-color: rgba(59, 130, 246, 0.3);
}

.file-type-xlsx {
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
}

.file-type-ppt {
    color: #f59e0b;
    border-color: rgba(245, 158, 11, 0.3);
}

/* Download Button */
.download-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.download-link:hover {
    border-color: var(--accent-primary);
    color: #ffffff;
    background: var(--accent-primary);
}

.download-link i {
    font-size: 0.9rem;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.page-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}

.page-btn:hover:not(:disabled) {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.page-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
}

.page-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Scroll Top */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 90;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Loading & No Results */
.loading,
.no-results {
    text-align: center;
    padding: 60px 0;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
    }

    .nav-menu {
        gap: 20px;
        font-size: 0.85rem;
    }

    .header {
        height: auto;
        position: relative;
    }

    main {
        margin-top: 20px;
        padding-top: 20px;
        padding-bottom: 120px;
    }

    .hero-section {
        padding-top: 20px;
    }

    .controls-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .category-tabs {
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    th,
    td {
        padding: 12px 16px;
    }

    .filename-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-btn {
        min-width: 44px;
        height: 44px;
        font-size: 1rem;
        padding: 10px 14px;
    }
}

@media (max-width: 480px) {
    .page-btn {
        min-width: 40px;
        height: 40px;
        font-size: 0.95rem;
        padding: 8px 12px;
    }
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    margin-top: 80px;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-section p,
.footer-section a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}