/* ===== CSS 변수 (Design Tokens) ===== */
:root {
    /* 색상 팔레트 */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #64748b;
    --color-accent: #10b981;
    --color-accent-dark: #059669;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* 배경색 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    /* 텍스트 */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* 보더 */
    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;

    /* 그림자 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* 간격 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* 전환 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

html, body {
    height: 100%;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1a2e 100%);
    min-height: 100vh;
}

/* ===== 레이아웃 ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 헤더 */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 28px;
}

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

.admin-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.admin-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 메인 콘텐츠 */
.main-content {
    flex: 1;
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* 캔버스 섹션 */
.canvas-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.canvas-wrapper {
    position: relative;
    flex: 1;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 2px dashed var(--border-color);
    overflow: hidden;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.canvas-wrapper.has-image {
    border-style: solid;
    border-color: var(--color-primary);
}

.canvas-wrapper.drag-over {
    border-color: var(--color-accent);
    background: rgba(16, 185, 129, 0.1);
}

#imageCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    max-height: 100%;
    cursor: crosshair;
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
    pointer-events: none;
}

.placeholder-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.placeholder-hint {
    font-size: 12px;
    margin-top: var(--spacing-sm);
    color: var(--text-muted);
}

.image-info {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 12px;
    text-align: center;
}

/* 확대/축소 컨트롤 */
.zoom-controls {
    position: absolute;
    bottom: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(30, 41, 59, 0.9);
    padding: 8px 12px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.zoom-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.zoom-level {
    min-width: 50px;
    text-align: center;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
}

/* 캔버스 도움말 */
.canvas-help {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 12px;
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.canvas-help b {
    color: var(--color-primary-light);
}


/* 컨트롤 패널 */
.control-panel {
    width: 320px;
    min-width: 320px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

.section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

/* 버튼 */
.button-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

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

.btn-icon {
    font-size: 18px;
    flex-shrink: 0;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: #475569;
}

.btn-accent {
    background: var(--color-accent);
    color: white;
}

.btn-accent:hover:not(:disabled) {
    background: var(--color-accent-dark);
}

.btn-transform {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 16px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #8b5cf6 100%);
    color: white;
    border: none;
}

.btn-transform:hover:not(:disabled) {
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
    transform: translateY(-2px);
}

/* 체크박스 */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs) 0;
    transition: var(--transition-fast);
    font-size: 15px;
}

.checkbox-label:hover {
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

/* 모달 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    max-width: 90vw;
    max-height: 90vh;
    width: 800px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    overflow: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.result-image-wrapper {
    position: relative;
    max-width: 100%;
    max-height: 60vh;
    overflow: hidden;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    cursor: default;
}

#resultImage {
    display: block;
    max-width: 100%;
    max-height: 60vh;
    border-radius: var(--border-radius-sm);
    transition: none;
    user-select: none;
    -webkit-user-drag: none;
}

/* 결과 이미지 확대/축소 컨트롤 */
.result-zoom-controls {
    position: absolute;
    bottom: 12px;
    right: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(30, 41, 59, 0.9);
    padding: 8px 12px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 10;
}

/* 결과 도움말 */
.result-help {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 12px;
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.3);
    margin-top: var(--spacing-sm);
}

.result-help b {
    color: var(--color-primary-light);
}

.result-info {
    color: var(--text-secondary);
    font-size: 13px;
}

.modal-footer {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* 로딩 오버레이 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 반응형 */
@media (max-width: 900px) {
    .main-content {
        flex-direction: column;
    }

    .control-panel {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
    }

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

    .canvas-wrapper {
        min-height: 400px;
    }
}

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .main-content {
        padding: var(--spacing-md);
    }

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

    .button-group {
        flex-direction: column;
    }

    .modal-footer {
        flex-direction: column;
    }
}

/* ===== 관리자 페이지 스타일 ===== */
.admin-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-box {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border-color);
}

.login-box h1 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 24px;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 13px;
}

.form-group input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.login-btn {
    width: 100%;
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.error-message {
    color: var(--color-error);
    font-size: 13px;
    margin-top: var(--spacing-sm);
    text-align: center;
}

/* 대시보드 */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.dashboard-header h1 {
    font-size: 24px;
}

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

.stat-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    text-align: center;
}

.stat-card .stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-card .stat-label {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: var(--spacing-xs);
}

.history-section {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.history-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.history-header h2 {
    font-size: 16px;
    font-weight: 600;
}

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

.filter-form input[type="date"] {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-family: inherit;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
}

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

.history-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.history-table td {
    font-size: 13px;
}

.history-table tr:hover td {
    background: rgba(99, 102, 241, 0.1);
}

.status-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
}

.status-badge.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-accent);
}

.status-badge.fail {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-error);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
}

.pagination button {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    font-family: inherit;
}

.pagination button:hover:not(:disabled) {
    background: var(--color-primary);
}

.pagination button.active {
    background: var(--color-primary);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 푸터 스타일 ===== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    max-width: 1600px;
    margin: 0 auto;
}

.footer-logo-link {
    display: inline-flex;
    align-items: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.footer-logo-link:hover {
    opacity: 0.8;
}

.footer-logo {
    height: 28px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.8;
}

.footer-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 12px;
    margin: 0;
}

.footer-company {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    margin: 0;
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-text {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}