/* ==========================================
   한성대학교 SW Festival 2025 - Main Page
   9개 On-Device AI 프로젝트 통합 메인 페이지
   ========================================== */

:root {
    /* Primary Colors */
    --primary-blue: #3498db;
    --primary-dark: #2c3e50;
    --primary-light: #ecf0f1;
    
    /* Accent Colors */
    --accent-green: #2ecc71;
    --accent-orange: #f39c12;
    --accent-red: #e74c3c;
    --accent-purple: #9b59b6;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-light: #f8f9fa;
    --gray-medium: #95a5a6;
    --gray-dark: #34495e;
    --black: #2c3e50;
    
    /* Theme Colors (Light Mode) */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #34495e;
    --text-muted: #7f8c8d;
    --card-bg: #ffffff;
    --card-shadow: rgba(0,0,0,0.12);
    --border-color: #ecf0f1;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --shadow-xl: 0 12px 48px rgba(0,0,0,0.2);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Mode Colors */
body.dark-mode {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --text-primary: #eee;
    --text-secondary: #ddd;
    --text-muted: #aaa;
    --card-bg: #0f3460;
    --card-shadow: rgba(0,0,0,0.5);
    --border-color: #2a2a40;
    --gray-light: #2a2a40;
}

/* ==========================================
   기본 스타일 및 리셋
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', 'Apple SD Gothic Neo', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==========================================
   헤더
   ========================================== */
.main-header {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.header-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}

.header-content {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-section i {
    font-size: 56px;
    color: white;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

.logo-text h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 4px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.logo-text p {
    font-size: 20px;
    font-weight: 600;
    opacity: 0.95;
}

.header-info {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 16px;
    font-weight: 500;
    background: rgba(255,255,255,0.15);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.info-item i {
    font-size: 20px;
}

/* Theme Toggle Button */
.theme-toggle {
    background: rgba(255,255,255,0.15);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
    color: white;
    font-size: 20px;
    backdrop-filter: blur(10px);
    margin-left: var(--spacing-md);
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.25);
    transform: rotate(15deg) scale(1.1);
}

.theme-toggle:active {
    transform: rotate(15deg) scale(0.95);
}

/* ==========================================
   히어로 섹션
   ========================================== */
.hero-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
    text-align: center;
    transition: background-color 0.3s ease;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 24px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 56px;
    font-weight: 900;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 18px;
    color: var(--gray-dark);
    font-weight: 600;
}

/* ==========================================
   통계 대시보드
   ========================================== */
.stats-dashboard {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
    transition: background-color 0.3s ease;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.dashboard-card {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 4px 16px var(--card-shadow);
    transition: all var(--transition-medium);
}

.dashboard-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--card-shadow);
}

.dashboard-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.dashboard-icon i {
    font-size: 28px;
    color: white;
}

.dashboard-content {
    flex: 1;
}

.dashboard-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.dashboard-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
}

/* ==========================================
   프로젝트 섹션
   ========================================== */
.projects-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
    transition: background-color 0.3s ease;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 20px;
    color: var(--text-secondary);
}

/* 검색 & 필터 */
.search-filter-container {
    max-width: 1000px;
    margin: 0 auto var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 16px var(--card-shadow);
    transition: all 0.3s ease;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.search-box i.fa-search {
    position: absolute;
    left: var(--spacing-md);
    color: var(--gray-medium);
    font-size: 18px;
}

.search-box input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-xl) var(--spacing-md) 50px;
    font-size: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.clear-btn {
    position: absolute;
    right: var(--spacing-sm);
    background: var(--gray-light);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.clear-btn:hover {
    background: #667eea;
    color: white;
    transform: rotate(90deg);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-light);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-dark);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

.filter-btn:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-2px);
}

.filter-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
}

.filter-btn i {
    font-size: 16px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* ==========================================
   프로젝트 카드
   ========================================== */
.project-card {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 16px var(--card-shadow);
    transition: all var(--transition-medium);
    cursor: pointer;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-medium);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-card:hover::before {
    transform: scaleX(1);
}

/* Favorite Button */
.favorite-btn {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 10;
    background: rgba(255,255,255,0.9);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.favorite-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.favorite-btn i {
    font-size: 20px;
    color: #e74c3c;
    transition: all var(--transition-fast);
}

.favorite-btn.active i {
    font-weight: 900;
}

.favorite-btn:active {
    transform: scale(0.95);
}

body.dark-mode .favorite-btn {
    background: rgba(44, 62, 80, 0.9);
}

/* Compare Checkbox */
.compare-checkbox {
    position: absolute;
    bottom: 16px;
    left: 16px;
    z-index: 10;
    background: rgba(255,255,255,0.95);
    border: 2px solid #667eea;
    border-radius: var(--radius-lg);
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.compare-checkbox:hover {
    background: #667eea;
    color: white;
}

.compare-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #667eea;
}

.compare-checkbox label {
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    margin: 0;
    user-select: none;
}

body.dark-mode .compare-checkbox {
    background: rgba(44, 62, 80, 0.95);
    color: white;
}

body.compare-mode .compare-checkbox {
    display: flex !important;
}

/* Compare Toggle Button */
.compare-toggle {
    position: relative;
    background: rgba(255,255,255,0.15);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
    color: white;
    font-size: 20px;
    backdrop-filter: blur(10px);
    margin-left: var(--spacing-sm);
}

.compare-toggle:hover {
    background: rgba(255,255,255,0.25);
    transform: scale(1.1);
}

.compare-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: #e74c3c;
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
}

.compare-badge.hidden {
    display: none;
}

/* Compare Floating Button */
.compare-floating {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    animation: slideInUp 0.3s ease;
}

.compare-floating-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.compare-count {
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.btn-compare {
    background: white;
    color: #667eea;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn-compare:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-clear-compare {
    background: rgba(255,255,255,0.2);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-clear-compare:hover {
    background: rgba(255,255,255,0.3);
    transform: rotate(90deg);
}

/* Compare Modal */
.compare-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.compare-modal.active {
    display: flex;
}

.compare-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
}

.compare-modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    max-width: 1200px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    animation: modalSlideIn 0.3s ease;
}

.compare-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-secondary);
}

.compare-modal-header h2 {
    font-size: 24px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.close-modal {
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: var(--gray-light);
    transform: rotate(90deg);
}

.compare-modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(90vh - 100px);
}

/* Compare Table */
.compare-table {
    width: 100%;
    border-collapse: collapse;
}

.compare-table th,
.compare-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.compare-table th {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 10;
}

.compare-table td {
    color: var(--text-secondary);
}

.compare-table .row-label {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-secondary);
    width: 150px;
}

.compare-project-header {
    text-align: center;
    padding: var(--spacing-lg);
}

.compare-project-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
    font-size: 24px;
    color: white;
}

.compare-project-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.compare-project-subtitle {
    font-size: 14px;
    color: var(--text-muted);
}

.compare-table .btn-visit {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.compare-table .btn-visit:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* QR Modal */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.qr-modal.active {
    display: flex;
}

.qr-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
}

.qr-modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    animation: modalSlideIn 0.3s ease;
}

.qr-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-secondary);
}

.qr-modal-header h2 {
    font-size: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.qr-modal-body {
    padding: var(--spacing-xl);
    text-align: center;
}

.qr-project-info {
    margin-bottom: var(--spacing-lg);
}

.qr-project-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.qr-project-subtitle {
    font-size: 16px;
    color: var(--text-muted);
}

.qr-code-container {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: inline-block;
    margin: var(--spacing-md) 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.qr-code-container img {
    display: block;
    max-width: 100%;
    height: auto;
}

.qr-url {
    font-size: 14px;
    color: var(--text-muted);
    word-break: break-all;
    margin-top: var(--spacing-md);
}

.qr-download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.qr-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.card-ribbon {
    position: absolute;
    top: 20px;
    right: -30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6px 40px;
    font-size: 14px;
    font-weight: 700;
    transform: rotate(45deg);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.card-icon i {
    font-size: 40px;
    color: white;
}

.card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.card-subtitle {
    font-size: 16px;
    color: var(--gray-medium);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.card-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--gray-light);
    border-radius: var(--radius-lg);
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-dark);
    transition: all var(--transition-fast);
}

.project-card:hover .tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.card-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tech-badge {
    display: inline-block;
    padding: 4px 10px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: #667eea;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--gray-light);
    margin-top: auto;
}

.team-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-secondary);
}

.card-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.qr-btn {
    background: transparent;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #667eea;
    transition: all var(--transition-fast);
}

.qr-btn:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.15);
}

.qr-btn i {
    font-size: 18px;
}

.card-footer .fa-arrow-right {
    font-size: 20px;
    color: #667eea;
    transition: transform var(--transition-fast);
}

.project-card:hover .card-footer .fa-arrow-right {
    transform: translateX(4px);
}

/* ==========================================
   기술 스택 섹션
   ========================================== */
.tech-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

.section-title {
    text-align: center;
    font-size: 48px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2xl);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.tech-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--gray-light);
    border-radius: var(--radius-xl);
    transition: all var(--transition-medium);
}

.tech-item:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.tech-item i {
    font-size: 48px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.tech-item h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.tech-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ==========================================
   푸터
   ========================================== */
.main-footer {
    background: var(--primary-dark);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: rgba(255,255,255,0.9);
}

.footer-section p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--spacing-xs);
}

.footer-bottom i {
    color: var(--accent-red);
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

@keyframes heartBeat {
    0% {
        transform: scale(1);
    }
    25% {
        transform: scale(1.3) rotate(-15deg);
    }
    50% {
        transform: scale(1.1) rotate(15deg);
    }
    75% {
        transform: scale(1.2) rotate(-10deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
    }
}

/* ==========================================
   반응형 디자인
   ========================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 48px;
    }
    
    .section-header h2,
    .section-title {
        font-size: 40px;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-text h1 {
        font-size: 28px;
    }
    
    .logo-text p {
        font-size: 16px;
    }
    
    .header-info {
        justify-content: center;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .stat-number {
        font-size: 40px;
    }
    
    .section-header h2,
    .section-title {
        font-size: 32px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    /* 검색 & 필터 반응형 */
    .search-filter-container {
        padding: var(--spacing-md);
    }
    
    .filter-buttons {
        gap: var(--spacing-xs);
    }
    
    .filter-btn {
        font-size: 14px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .logo-section i {
        font-size: 40px;
    }
    
    .logo-text h1 {
        font-size: 24px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .card-title {
        font-size: 24px;
    }
    
    .card-ribbon {
        font-size: 12px;
        padding: 4px 35px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* ==========================================
   애니메이션
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeInUp 0.6s ease backwards;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }
.project-card:nth-child(5) { animation-delay: 0.5s; }
.project-card:nth-child(6) { animation-delay: 0.6s; }
.project-card:nth-child(7) { animation-delay: 0.7s; }
.project-card:nth-child(8) { animation-delay: 0.8s; }
.project-card:nth-child(9) { animation-delay: 0.9s; }

/* ==========================================
   접근성
   ========================================== */
*:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   프린트 스타일
   ========================================== */
@media print {
    .main-header,
    .main-footer {
        background: white !important;
        color: black !important;
    }
    
    .project-card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ==========================================
   유틸리티 클래스
   ========================================== */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.p-lg {
    padding: var(--spacing-lg);
}