/**
 * ToolMaster - 도구 페이지 공통 스타일
 * 모든 도구 페이지에서 이 파일을 먼저 로드해야 합니다.
 */

/* ========================================
   CSS 변수 정의 (밝게 조정된 다크 테마)
   ======================================== */

:root {
    /* 배경색 - 약간 밝게 조정 */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    /* 액센트 색상 */
    --accent-primary: #06b6d4;
    --accent-primary-light: #22d3ee;
    --accent-secondary: #8b5cf6;
    --accent-warning: #f59e0b;
    --accent-success: #10b981;
    --accent-danger: #ef4444;
    
    /* 텍스트 색상 */
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    
    /* 테두리 */
    --border-color: rgba(6, 182, 212, 0.2);
    --border-color-light: rgba(255, 255, 255, 0.1);
    --border-color-medium: rgba(255, 255, 255, 0.15);
    
    /* 그림자 */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.25);
    
    /* 그라데이션 - 약간 밝게 */
    --gradient-bg: linear-gradient(135deg, #111827 0%, #1f2937 100%);
    --gradient-primary: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    --gradient-secondary: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.06) 100%);
    
    /* 타이포그래피 */
    --font-primary: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* 폰트 사이즈 */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    
    /* 간격 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* 둥근 모서리 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ========================================
   전체 페이지 다크 테마 적용
   ======================================== */

/* 도구 페이지일 때 body 배경 다크 적용 */
body:has(.tool-page) {
    background: var(--bg-primary) !important;
}

/* :has() 미지원 브라우저를 위한 폴백 - JS로 클래스 추가 필요 */
body.dark-theme {
    background: var(--bg-primary) !important;
}

/* main 영역도 다크 배경 */
body:has(.tool-page) main,
body.dark-theme main {
    background: var(--bg-primary);
}

/* ========================================
   도구 페이지 기본 레이아웃
   ======================================== */

.tool-page {
    min-height: calc(100vh - 140px);
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    color: var(--text-primary);
}

.tool-page-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ========================================
   도구 헤더
   ======================================== */

.tool-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.tool-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.tool-icon i {
    font-size: 1.75rem;
    color: #fff;
}

.tool-info {
    flex: 1;
}

.tool-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
}

.tool-description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ========================================
   섹션 카드
   ======================================== */

.tool-section {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.section-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(0, 212, 255, 0.05);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.section-header h2,
.section-header h3,
.section-header h4,
.section-header h5 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--accent-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

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

/* ========================================
   버튼
   ======================================== */

.btn-tool {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-tool:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary 버튼 */
.btn-tool-primary {
    background: var(--gradient-primary);
    color: #fff;
}

.btn-tool-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: #fff;
}

/* Secondary 버튼 */
.btn-tool-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color-light);
}

.btn-tool-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* Outline 버튼 */
.btn-tool-outline {
    background: transparent;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
}

.btn-tool-outline:hover:not(:disabled) {
    background: rgba(0, 212, 255, 0.1);
    color: var(--accent-primary);
}

/* Success 버튼 */
.btn-tool-success {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: #fff;
}

.btn-tool-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
    color: #fff;
}

/* Danger 버튼 */
.btn-tool-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: #fff;
}

.btn-tool-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
    color: #fff;
}

/* Warning 버튼 */
.btn-tool-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #fff;
}

.btn-tool-warning:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
    color: #fff;
}

/* Info 버튼 */
.btn-tool-info {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: #fff;
}

.btn-tool-info:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.3);
    color: #fff;
}

/* 버튼 크기 */
.btn-tool-sm {
    padding: 0.5rem 0.875rem;
    font-size: var(--text-xs);
    border-radius: 8px;
}

.btn-tool-lg {
    padding: 1rem 2rem;
    font-size: var(--text-base);
}

/* 아이콘 전용 버튼 */
.btn-tool-icon {
    padding: 0.5rem;
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.btn-tool-icon i {
    margin: 0;
}

/* 버튼 그룹 */
.btn-tool-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* 전체 너비 버튼 */
.btn-tool.w-100 {
    width: 100%;
}

/* ========================================
   그리드 선택 버튼 (아이콘+라벨+설명)
   ======================================== */

.btn-grid-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.btn-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 0.75rem 0.5rem;
    min-height: 70px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.06) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-grid:hover {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(6, 182, 212, 0.15) 100%);
    border-color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.2);
}

.btn-grid:active {
    transform: translateY(-1px);
}

.btn-grid i {
    font-size: 1.25rem;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
}

.btn-grid:hover i {
    transform: scale(1.1);
}

.btn-grid .btn-grid-label {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-primary);
}

.btn-grid .btn-grid-desc {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* 그리드 버튼 색상 변형 */
.btn-grid.btn-grid-danger {
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-grid.btn-grid-danger:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(239, 68, 68, 0.2) 100%);
    border-color: var(--accent-danger);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.2);
}

.btn-grid.btn-grid-danger i,
.btn-grid.btn-grid-danger .btn-grid-label {
    color: var(--accent-danger);
}

.btn-grid.btn-grid-success:hover {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(34, 197, 94, 0.2) 100%);
    border-color: var(--accent-success);
    box-shadow: 0 8px 25px rgba(34, 197, 94, 0.2);
}

.btn-grid.btn-grid-success i {
    color: var(--accent-success);
}

/* 그리드 버튼 활성 상태 */
.btn-grid.active {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(6, 182, 212, 0.25) 100%);
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.btn-grid.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
}

/* 버튼 활성 상태 (토글) */
.btn-tool.active {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Bootstrap 버튼 다크 테마 오버라이드 */
.tool-page .btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color-light);
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.tool-page .btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: var(--border-color-medium);
}

.tool-page .btn-primary {
    background: var(--gradient-primary);
    border: none;
    color: #fff;
}

.tool-page .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.tool-page .btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color-light);
    color: var(--text-secondary);
}

.tool-page .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
}

.tool-page .btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border: none;
    color: #fff;
}

.tool-page .btn-success:hover {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.tool-page .btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border: none;
    color: #fff;
}

.tool-page .btn-danger:hover {
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
}

.tool-page .btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    border: none;
    color: #fff;
}

.tool-page .btn-warning:hover {
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
}

.tool-page .btn-info {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    border: none;
    color: #fff;
}

.tool-page .btn-info:hover {
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.tool-page .btn-outline-primary {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.tool-page .btn-outline-primary:hover {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-primary);
}

.tool-page .btn-outline-secondary {
    background: transparent;
    border: 1px solid var(--border-color-light);
    color: var(--text-secondary);
}

.tool-page .btn-outline-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: var(--border-color-medium);
}

.tool-page .btn-outline-success {
    background: transparent;
    border: 1px solid var(--accent-success);
    color: var(--accent-success);
}

.tool-page .btn-outline-success:hover {
    background: rgba(16, 185, 129, 0.15);
}

.tool-page .btn-outline-danger {
    background: transparent;
    border: 1px solid var(--accent-danger);
    color: var(--accent-danger);
}

.tool-page .btn-outline-danger:hover {
    background: rgba(239, 68, 68, 0.15);
}

.tool-page .btn-outline-warning {
    background: transparent;
    border: 1px solid var(--accent-warning);
    color: var(--accent-warning);
}

.tool-page .btn-outline-warning:hover {
    background: rgba(245, 158, 11, 0.15);
}

.tool-page .btn-outline-info {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.tool-page .btn-outline-info:hover {
    background: rgba(6, 182, 212, 0.15);
}

/* ========================================
   입력 필드
   ======================================== */

.input-tool {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--text-base);
    font-family: var(--font-primary);
    transition: all 0.3s ease;
}

.input-tool::placeholder {
    color: var(--text-muted);
}

.input-tool:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(0, 212, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.input-tool:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 텍스트 영역 */
.textarea-tool {
    min-height: 150px;
    resize: vertical;
    font-family: var(--font-mono);
    line-height: 1.6;
    background: rgba(0, 0, 0, 0.3) !important;
    color: var(--text-primary) !important;
}

.textarea-tool::placeholder {
    color: var(--text-muted) !important;
}

/* readonly 텍스트 영역 */
.textarea-tool[readonly],
.input-tool[readonly] {
    background: rgba(0, 0, 0, 0.4) !important;
    color: var(--text-secondary) !important;
    cursor: default;
}

/* 셀렉트 */
.select-tool {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2300d4ff' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

/* 라벨 */
.label-tool {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* 폼 그룹 */
.form-group-tool {
    margin-bottom: var(--spacing-lg);
}

/* 입력 그룹 */
.input-group-tool {
    display: flex;
    gap: var(--spacing-sm);
}

.input-group-tool .input-tool {
    flex: 1;
}

/* ========================================
   결과 표시 영역
   ======================================== */

.result-box {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    min-height: 100px;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.result-box.success {
    border-color: var(--accent-success);
    background: rgba(34, 197, 94, 0.1);
}

.result-box.error {
    border-color: var(--accent-danger);
    background: rgba(239, 68, 68, 0.1);
}

.result-box.info {
    border-color: var(--accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

/* ========================================
   알림 메시지
   ======================================== */

.alert-tool {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: var(--spacing-md);
}

.alert-tool i {
    margin-top: 2px;
}

.alert-tool-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #86efac;
}

.alert-tool-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-tool-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #fcd34d;
}

.alert-tool-info {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    color: #67e8f9;
}

/* ========================================
   로딩 상태
   ======================================== */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color-light);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 3px;
}

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

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 28, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: var(--radius-lg);
}

/* ========================================
   통계/정보 표시
   ======================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.stat-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.stat-number {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-primary);
    display: block;
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ========================================
   옵션 컨트롤
   ======================================== */

/* 체크박스 */
.checkbox-tool {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.checkbox-tool input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

/* 라디오 버튼 그룹 */
.radio-group-tool {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.radio-tool {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.radio-tool:hover {
    background: rgba(255, 255, 255, 0.05);
}

.radio-tool input[type="radio"] {
    accent-color: var(--accent-primary);
}

.radio-tool.active,
.radio-tool:has(input:checked) {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* 범위 슬라이더 */
.range-tool {
    width: 100%;
    height: 6px;
    appearance: none;
    background: var(--border-color-light);
    border-radius: 3px;
    outline: none;
}

.range-tool::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.range-tool::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* ========================================
   그리드 레이아웃
   ======================================== */

.tool-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.tool-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.tool-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
    .tool-grid-2,
    .tool-grid-3 {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   파일 업로드 영역
   ======================================== */

.file-drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-drop-zone:hover,
.file-drop-zone.dragover {
    border-color: var(--accent-primary);
    background: rgba(0, 212, 255, 0.05);
}

.file-drop-zone i {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.file-drop-zone p {
    color: var(--text-secondary);
    margin: 0;
}

.file-drop-zone .file-types {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

/* ========================================
   탭 네비게이션
   ======================================== */

.tabs-tool {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.tab-tool {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

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

.tab-tool.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

/* ========================================
   반응형
   ======================================== */

@media (max-width: 576px) {
    .tool-page {
        padding: var(--spacing-md);
    }
    
    .tool-header {
        flex-direction: column;
        text-align: center;
    }
    
    .tool-icon {
        margin: 0 auto;
    }
    
    .section-content {
        padding: var(--spacing-md);
    }
    
    .btn-tool-group {
        flex-direction: column;
    }
    
    .btn-tool {
        width: 100%;
    }
}

@media (min-width: 577px) and (max-width: 768px) {
    .tool-page {
        padding: var(--spacing-lg);
    }
}

@media (min-width: 769px) {
    .tool-page {
        padding: var(--spacing-xl);
    }
}

/* ========================================
   유틸리티 클래스
   ======================================== */

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

.text-primary { color: var(--text-primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-accent { color: var(--accent-primary) !important; }
.text-success { color: var(--accent-success) !important; }
.text-danger { color: var(--accent-danger) !important; }
.text-warning { color: var(--accent-warning) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-sm) !important; }
.mt-2 { margin-top: var(--spacing-md) !important; }
.mt-3 { margin-top: var(--spacing-lg) !important; }
.mt-4 { margin-top: var(--spacing-xl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-sm) !important; }
.mb-2 { margin-bottom: var(--spacing-md) !important; }
.mb-3 { margin-bottom: var(--spacing-lg) !important; }
.mb-4 { margin-bottom: var(--spacing-xl) !important; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }

.gap-1 { gap: var(--spacing-sm) !important; }
.gap-2 { gap: var(--spacing-md) !important; }
.gap-3 { gap: var(--spacing-lg) !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

/* ========================================
   Bootstrap 다크 테마 오버라이드
   기존 Bootstrap 클래스를 다크 테마에 맞게 변환
   ======================================== */

/* 전체 페이지 다크 배경 */
body.dark-theme {
    background-color: var(--bg-primary) !important;
    color: var(--text-primary) !important;
    font-family: var(--font-primary);
}

body.dark-theme .container,
body.dark-theme .container-fluid {
    color: var(--text-primary);
}

/* 카드 컴포넌트 */
body.dark-theme .card {
    background: var(--gradient-card) !important;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-xl) !important;
    box-shadow: var(--shadow-lg) !important;
    color: var(--text-primary);
}

body.dark-theme .card-header {
    background: rgba(6, 182, 212, 0.08) !important;
    border-bottom: 1px solid var(--border-color) !important;
    color: var(--text-primary) !important;
    padding: 1rem 1.5rem;
}

body.dark-theme .card-header h5,
body.dark-theme .card-header h6 {
    color: var(--text-primary) !important;
    margin: 0;
}

body.dark-theme .card-body {
    background: transparent !important;
    color: var(--text-primary);
    padding: 1.5rem;
}

body.dark-theme .card-footer {
    background: rgba(0, 0, 0, 0.2) !important;
    border-top: 1px solid var(--border-color) !important;
}

/* 폼 컨트롤 */
body.dark-theme .form-control,
body.dark-theme .form-select {
    background-color: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid var(--border-color-light) !important;
    color: var(--text-primary) !important;
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

body.dark-theme .form-control::placeholder {
    color: var(--text-muted) !important;
}

body.dark-theme .form-control:focus,
body.dark-theme .form-select:focus {
    background-color: rgba(6, 182, 212, 0.05) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15) !important;
    color: var(--text-primary) !important;
}

body.dark-theme .form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") !important;
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

body.dark-theme .form-select option {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* 폼 레이블 */
body.dark-theme .form-label {
    color: var(--text-secondary) !important;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

body.dark-theme .form-text {
    color: var(--text-muted) !important;
}

/* 폼 체크박스/라디오 */
body.dark-theme .form-check-input {
    background-color: rgba(255, 255, 255, 0.1) !important;
    border-color: var(--border-color-light) !important;
}

body.dark-theme .form-check-input:checked {
    background-color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
}

body.dark-theme .form-check-label {
    color: var(--text-secondary) !important;
}

/* 폼 레인지 (슬라이더) */
body.dark-theme .form-range {
    background: transparent;
}

body.dark-theme .form-range::-webkit-slider-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
}

body.dark-theme .form-range::-webkit-slider-thumb {
    background: var(--accent-primary);
    border: none;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

body.dark-theme .form-range::-moz-range-track {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-theme .form-range::-moz-range-thumb {
    background: var(--accent-primary);
    border: none;
}

/* 버튼 */
body.dark-theme .btn {
    border-radius: var(--radius-md);
    padding: 0.6rem 1.25rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

body.dark-theme .btn-primary {
    background: var(--gradient-primary) !important;
    border: none !important;
    color: #fff !important;
}

body.dark-theme .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow) !important;
}

body.dark-theme .btn-secondary {
    background: rgba(255, 255, 255, 0.08) !important;
    border: 1px solid var(--border-color-light) !important;
    color: var(--text-secondary) !important;
}

body.dark-theme .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12) !important;
    color: var(--text-primary) !important;
}

body.dark-theme .btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    border: none !important;
    color: #fff !important;
}

body.dark-theme .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3) !important;
}

body.dark-theme .btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
    border: none !important;
    color: #fff !important;
}

body.dark-theme .btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3) !important;
}

body.dark-theme .btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%) !important;
    border: none !important;
    color: #fff !important;
}

body.dark-theme .btn-info {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%) !important;
    border: none !important;
    color: #fff !important;
}

body.dark-theme .btn-outline-primary {
    background: transparent !important;
    border: 1px solid var(--accent-primary) !important;
    color: var(--accent-primary) !important;
}

body.dark-theme .btn-outline-primary:hover,
body.dark-theme .btn-outline-primary.active {
    background: rgba(6, 182, 212, 0.15) !important;
    color: var(--accent-primary) !important;
}

body.dark-theme .btn-outline-secondary {
    background: transparent !important;
    border: 1px solid var(--border-color-light) !important;
    color: var(--text-secondary) !important;
}

body.dark-theme .btn-outline-secondary:hover {
    background: rgba(255, 255, 255, 0.08) !important;
    color: var(--text-primary) !important;
}

body.dark-theme .btn-outline-success {
    border-color: var(--accent-success) !important;
    color: var(--accent-success) !important;
}

body.dark-theme .btn-outline-success:hover {
    background: rgba(16, 185, 129, 0.15) !important;
}

body.dark-theme .btn-outline-danger {
    border-color: var(--accent-danger) !important;
    color: var(--accent-danger) !important;
}

body.dark-theme .btn-outline-danger:hover {
    background: rgba(239, 68, 68, 0.15) !important;
}

/* 버튼 그룹 */
body.dark-theme .btn-group .btn {
    border-radius: 0;
}

body.dark-theme .btn-group .btn:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

body.dark-theme .btn-group .btn:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

body.dark-theme .btn-check:checked + .btn-outline-primary {
    background: var(--accent-primary) !important;
    color: #fff !important;
}

/* 테이블 */
body.dark-theme .table {
    --bs-table-bg: transparent !important;
    --bs-table-color: var(--text-primary) !important;
    --bs-table-border-color: var(--border-color-light) !important;
    --bs-table-striped-bg: rgba(255, 255, 255, 0.02) !important;
    --bs-table-hover-bg: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-primary);
    border-color: var(--border-color-light);
    background: transparent !important;
}

body.dark-theme .table > :not(caption) > * > * {
    background-color: transparent !important;
    color: var(--text-secondary);
    border-bottom-color: var(--border-color-light) !important;
}

body.dark-theme .table tbody {
    background: transparent !important;
}

body.dark-theme .table tbody tr {
    background: transparent !important;
}

body.dark-theme .table tbody td {
    background: transparent !important;
    color: var(--text-secondary);
}

body.dark-theme .table th,
body.dark-theme .table td {
    border-color: var(--border-color-light) !important;
    padding: 0.75rem 1rem;
}

body.dark-theme .table thead th {
    background: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

body.dark-theme .table-hover tbody tr:hover {
    background: rgba(255, 255, 255, 0.02) !important;
    color: var(--text-primary);
}

body.dark-theme .table-striped tbody tr:nth-of-type(odd) {
    background: rgba(255, 255, 255, 0.02);
}

/* 뱃지 */
body.dark-theme .badge {
    padding: 0.35rem 0.65rem;
    font-weight: 500;
    border-radius: 6px;
}

body.dark-theme .badge.bg-primary,
body.dark-theme .bg-primary {
    background: var(--accent-primary) !important;
}

body.dark-theme .badge.bg-secondary,
body.dark-theme .bg-secondary {
    background: rgba(255, 255, 255, 0.15) !important;
}

body.dark-theme .badge.bg-success,
body.dark-theme .bg-success {
    background: var(--accent-success) !important;
}

body.dark-theme .badge.bg-danger,
body.dark-theme .bg-danger {
    background: var(--accent-danger) !important;
}

body.dark-theme .badge.bg-warning,
body.dark-theme .bg-warning {
    background: var(--accent-warning) !important;
    color: #fff !important;
}

body.dark-theme .badge.bg-info,
body.dark-theme .bg-info {
    background: var(--accent-primary) !important;
}

body.dark-theme .badge.bg-light {
    background: rgba(255, 255, 255, 0.1) !important;
    color: var(--text-primary) !important;
}

body.dark-theme .badge.bg-dark {
    background: rgba(0, 0, 0, 0.5) !important;
}

/* 알림 */
body.dark-theme .alert {
    border-radius: var(--radius-lg);
    border: none;
}

body.dark-theme .alert-primary {
    background: rgba(6, 182, 212, 0.15) !important;
    color: #67e8f9 !important;
    border-left: 4px solid var(--accent-primary);
}

body.dark-theme .alert-success {
    background: rgba(16, 185, 129, 0.15) !important;
    color: #6ee7b7 !important;
    border-left: 4px solid var(--accent-success);
}

body.dark-theme .alert-danger {
    background: rgba(239, 68, 68, 0.15) !important;
    color: #fca5a5 !important;
    border-left: 4px solid var(--accent-danger);
}

body.dark-theme .alert-warning {
    background: rgba(245, 158, 11, 0.15) !important;
    color: #fcd34d !important;
    border-left: 4px solid var(--accent-warning);
}

body.dark-theme .alert-info {
    background: rgba(6, 182, 212, 0.15) !important;
    color: #67e8f9 !important;
    border-left: 4px solid var(--accent-primary);
}

body.dark-theme .alert-secondary {
    background: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-secondary) !important;
    border-left: 4px solid var(--border-color);
}

body.dark-theme .alert .btn-close {
    filter: invert(1);
}

/* 모달 */
body.dark-theme .modal-content {
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-xl) !important;
}

body.dark-theme .modal-header {
    border-bottom: 1px solid var(--border-color) !important;
    background: rgba(6, 182, 212, 0.05);
}

body.dark-theme .modal-header .modal-title {
    color: var(--text-primary);
}

body.dark-theme .modal-header .btn-close {
    filter: invert(1);
}

body.dark-theme .modal-body {
    color: var(--text-secondary);
}

body.dark-theme .modal-footer {
    border-top: 1px solid var(--border-color) !important;
}

/* 드롭다운 */
body.dark-theme .dropdown-menu {
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-lg);
}

body.dark-theme .dropdown-item {
    color: var(--text-secondary) !important;
    padding: 0.5rem 1rem;
}

body.dark-theme .dropdown-item:hover,
body.dark-theme .dropdown-item:focus {
    background: rgba(6, 182, 212, 0.1) !important;
    color: var(--text-primary) !important;
}

body.dark-theme .dropdown-divider {
    border-color: var(--border-color-light);
}

/* 프로그레스 바 */
body.dark-theme .progress {
    background: rgba(255, 255, 255, 0.1) !important;
    border-radius: var(--radius-md);
    height: 8px;
}

body.dark-theme .progress-bar {
    background: var(--gradient-primary) !important;
    border-radius: var(--radius-md);
}

/* 리스트 그룹 */
body.dark-theme .list-group-item {
    background: rgba(255, 255, 255, 0.02) !important;
    border-color: var(--border-color-light) !important;
    color: var(--text-secondary);
}

body.dark-theme .list-group-item:hover {
    background: rgba(255, 255, 255, 0.05) !important;
}

body.dark-theme .list-group-item.active {
    background: rgba(6, 182, 212, 0.15) !important;
    border-color: var(--accent-primary) !important;
    color: var(--accent-primary);
}

/* 텍스트 색상 오버라이드 */
body.dark-theme .text-dark {
    color: var(--text-primary) !important;
}

body.dark-theme .text-muted {
    color: var(--text-muted) !important;
}

body.dark-theme .text-primary {
    color: var(--accent-primary) !important;
}

body.dark-theme .text-success {
    color: var(--accent-success) !important;
}

body.dark-theme .text-danger {
    color: var(--accent-danger) !important;
}

body.dark-theme .text-warning {
    color: var(--accent-warning) !important;
}

body.dark-theme .text-info {
    color: var(--accent-primary) !important;
}

/* 배경 오버라이드 */
body.dark-theme .bg-light {
    background: rgba(255, 255, 255, 0.05) !important;
}

body.dark-theme .bg-white {
    background: var(--bg-secondary) !important;
}

/* 테두리 */
body.dark-theme .border {
    border-color: var(--border-color-light) !important;
}

body.dark-theme .border-top,
body.dark-theme .border-bottom,
body.dark-theme .border-start,
body.dark-theme .border-end {
    border-color: var(--border-color-light) !important;
}

body.dark-theme hr {
    border-color: var(--border-color-light);
    opacity: 1;
}

/* 제목 태그 */
body.dark-theme h1, body.dark-theme h2, body.dark-theme h3,
body.dark-theme h4, body.dark-theme h5, body.dark-theme h6,
body.dark-theme .h1, body.dark-theme .h2, body.dark-theme .h3,
body.dark-theme .h4, body.dark-theme .h5, body.dark-theme .h6 {
    color: var(--text-primary);
}

body.dark-theme .display-1, body.dark-theme .display-2,
body.dark-theme .display-3, body.dark-theme .display-4,
body.dark-theme .display-5, body.dark-theme .display-6 {
    color: var(--text-primary);
}

body.dark-theme .lead {
    color: var(--text-secondary);
}

body.dark-theme p {
    color: var(--text-secondary);
}

body.dark-theme small,
body.dark-theme .small {
    color: var(--text-muted);
}

/* 링크 */
body.dark-theme a {
    color: var(--accent-primary);
}

body.dark-theme a:hover {
    color: var(--accent-primary-light);
}

/* 업로드 영역 (공통) */
body.dark-theme .upload-area {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.05) 100%);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

body.dark-theme .upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.05);
}

body.dark-theme .upload-area.dragover {
    border-color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.1);
    transform: scale(1.01);
}

body.dark-theme .upload-area i {
    color: var(--accent-primary);
}

body.dark-theme .upload-area h5 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

body.dark-theme .upload-area p {
    color: var(--text-muted);
}

/* 이미지 프리뷰 (공통) */
body.dark-theme .preview-container,
body.dark-theme .image-preview-container {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-lg);
    padding: 1rem;
    text-align: center;
}

body.dark-theme .image-info {
    margin-top: 0.5rem;
    color: var(--text-muted);
}

/* Nav Tabs / Pills */
body.dark-theme .nav-tabs {
    border-bottom-color: var(--border-color-light);
}

body.dark-theme .nav-tabs .nav-link {
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
}

body.dark-theme .nav-tabs .nav-link:hover {
    color: var(--text-primary);
    border-color: transparent;
}

body.dark-theme .nav-tabs .nav-link.active {
    color: var(--accent-primary);
    background: transparent;
    border-bottom-color: var(--accent-primary);
}

body.dark-theme .nav-pills .nav-link {
    color: var(--text-secondary);
    border-radius: var(--radius-md);
}

body.dark-theme .nav-pills .nav-link:hover {
    background: rgba(255, 255, 255, 0.05);
}

body.dark-theme .nav-pills .nav-link.active {
    background: var(--accent-primary);
    color: #fff;
}

/* Accordion */
body.dark-theme .accordion-item {
    background: transparent;
    border-color: var(--border-color-light);
}

body.dark-theme .accordion-button {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
}

body.dark-theme .accordion-button:not(.collapsed) {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-primary);
}

body.dark-theme .accordion-button::after {
    filter: invert(1);
}

body.dark-theme .accordion-body {
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-secondary);
}

/* Collapse */
body.dark-theme .collapse,
body.dark-theme .collapsing {
    background: transparent;
}

/* Input Group */
body.dark-theme .input-group-text {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color-light);
    color: var(--text-muted);
}

/* Spinner */
body.dark-theme .spinner-border {
    color: var(--accent-primary);
}

body.dark-theme .spinner-grow {
    color: var(--accent-primary);
}

/* Tooltip */
body.dark-theme .tooltip-inner {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Popover */
body.dark-theme .popover {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

body.dark-theme .popover-header {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color-light);
    color: var(--text-primary);
}

body.dark-theme .popover-body {
    color: var(--text-secondary);
}

/* 공통 이미지 도구 스타일 */
body.dark-theme .resize-options,
body.dark-theme .compression-options,
body.dark-theme .format-options {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

body.dark-theme .resize-options h6,
body.dark-theme .compression-options h6,
body.dark-theme .format-options h6,
body.dark-theme .image-preview h6 {
    color: var(--accent-primary);
    font-weight: 600;
}

/* 통계 아이템 (stat-item) */
body.dark-theme .stat-item {
    background: rgba(255, 255, 255, 0.03) !important;
    border: 1px solid var(--border-color-light) !important;
    border-radius: var(--radius-md);
    padding: 1rem;
    color: var(--text-primary);
}

body.dark-theme .stat-item h5,
body.dark-theme .stat-item .stat-label {
    color: var(--accent-primary) !important;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

body.dark-theme .stat-item .stat-value,
body.dark-theme .stat-item p,
body.dark-theme .stat-item span {
    color: var(--text-secondary) !important;
}

/* QR 코드 컨테이너 */
body.dark-theme #qrCodeContainer {
    background: rgba(255, 255, 255, 0.95) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-lg);
}

/* 결과 카드 */
body.dark-theme #resultsCard {
    background: var(--gradient-card) !important;
    border: 1px solid var(--border-color) !important;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Shadow 오버라이드 */
body.dark-theme .shadow,
body.dark-theme .shadow-sm,
body.dark-theme .shadow-lg {
    box-shadow: var(--shadow-lg) !important;
}

/* Rounded 유지 */
body.dark-theme .rounded {
    border-radius: var(--radius-md) !important;
}

body.dark-theme .rounded-lg {
    border-radius: var(--radius-lg) !important;
}

body.dark-theme .rounded-xl {
    border-radius: var(--radius-xl) !important;
}