:root { 
  color-scheme: light dark; 
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-dashed: #cbd5e1;
  --hover-bg: #eff6ff;
  --drag-bg: #dbeafe;
  --button-bg: #2563eb;
  --button-hover: #1d4ed8;
  --button-disabled: #94a3b8;
  --button-secondary: #64748b;
  --button-danger: #ef4444;
  --button-danger-hover: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --border-color: #475569;
    --border-dashed: #64748b;
    --hover-bg: #1e3a8a;
    --drag-bg: #1e40af;
    --button-bg: #3b82f6;
    --button-hover: #2563eb;
    --button-disabled: #64748b;
    --button-secondary: #94a3b8;
    --button-danger: #f87171;
    --button-danger-hover: #ef4444;
  }
}

body { 
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans KR', Arial, sans-serif; 
  margin: 0; 
  padding: 0; 
  background-color: var(--bg-primary);
  color: var(--text-primary);
}
.container { max-width: 720px; margin: 40px auto; padding: 0 16px; }
h1 { font-size: 24px; margin-bottom: 8px; color: var(--text-primary); }
p { opacity: 0.8; color: var(--text-primary); }

/* 드래그앤드랍 영역 스타일 */
.drop-zone {
    min-height: 120px; /* 드롭존 최소 높이 고정 */
    border: 2px dashed var(--border-dashed);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 24px 0;
    background: var(--bg-secondary);
}

.drop-zone:hover {
    border-color: var(--button-bg);
    background: var(--hover-bg);
}

.drop-zone.drag-over {
    border-color: var(--button-bg);
    background: var(--drag-bg);
    transform: scale(1.02);
}

.drop-zone-content p {
    margin: 8px 0;
    font-size: 16px;
    color: var(--text-primary);
}

.drop-zone-hint {
    font-size: 14px !important;
    opacity: 0.6 !important;
    color: var(--text-secondary) !important;
}

/* 파일 리스트 스타일 */
.file-list {
    max-height: 300px;
    overflow-y: auto;
    overflow-x: hidden;
    margin: 16px 0;
    min-height: 30px;
    /* 스크롤바 스타일링 */
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-secondary);
}

/* Webkit 브라우저용 스크롤바 스타일 */
.file-list::-webkit-scrollbar {
    width: 8px;
}

.file-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.file-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.file-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    margin: 4px 0;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border-left: 3px solid var(--button-bg);
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-size {
    font-size: 12px;
    color: var(--text-secondary);
}

.remove-file {
    background: var(--button-danger);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
    font-size: 12px;
}

.remove-file:hover {
    background: var(--button-danger-hover);
}

/* 폼 스타일 */
form { margin: 24px 0; }
input[type="file"] { flex: 1; }

.form-buttons {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 16px;
}

.hidden {
    display: none !important;
}
button, .button { 
    background: var(--button-bg); 
    color: white; 
    border: 0; 
    padding: 12px 24px; 
    border-radius: 8px; 
    cursor: pointer; 
    text-decoration: none; 
    display: inline-block;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s ease;
}

button:hover, .button:hover { 
    background: var(--button-hover);
    transform: translateY(-1px);
}

button:disabled {
    background: var(--button-disabled);
    cursor: not-allowed;
    transform: none;
}

button.secondary { background: var(--button-secondary); }
.status {
  display: none; /* 로그 영역 바깥에 표시되는 status 요소 숨김 */ 
    margin: 12px 0; 
    min-height: 24px; 
    color: var(--text-primary);
}
.result.hidden { display: none; }
.result { 
    margin-top: 24px; 
    padding: 16px; 
    border: 1px solid var(--border-color); 
    border-radius: 8px; 
    background: var(--bg-secondary);
}

.result h2 {
    color: var(--text-primary);
    margin-top: 0;
}

.result p {
    color: var(--text-primary);
}

.download-buttons {
    display: flex;
    gap: 12px;
    margin: 16px 0;
    flex-wrap: wrap;
}

.download-buttons .button {
    flex: none;
    min-width: auto;
    width: auto;
    max-width: none;
    padding: 12px 24px;
    text-align: center;
    font-size: 16px;
    white-space: nowrap;
}

/* 진행률 바 스타일 */
.progress-container {
    margin: 24px 0;
    padding: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.progress-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 18px;
}

.file-counter {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: normal;
    margin-left: 8px;
}

#progress-percentage {
    font-weight: bold;
    color: var(--button-bg);
    font-size: 18px;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--button-bg), var(--button-hover));
    border-radius: 6px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-message {
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

/* 로그 영역 스타일 */
.log-container {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.log-container h4 {
    margin: 0 0 12px 0;
    color: var(--text-primary);
    font-size: 16px;
}

.log-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    max-height: 200px;
    overflow-y: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 12px;
    line-height: 1.4;
}

.log-entry {
    margin: 2px 0;
    padding: 2px 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.log-entry:last-child {
    border-bottom: none;
}

.log-timestamp {
    color: var(--text-secondary);
    font-size: 10px;
    margin-right: 8px;
}

.log-message {
    color: var(--text-primary);
}

.log-error {
    color: var(--button-danger);
}

.log-success {
    color: #10b981;
}

.log-info {
    color: var(--button-bg);
}

/* 섹션 제목 스타일 */
.section-title {
    display: inline-flex;
    align-items: center;
    position: relative;
    margin-bottom: 15px;
    padding-bottom: 10px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.section-title-primary {
    border-bottom: 2px solid var(--button-bg);
}

.section-title-success {
    border-bottom: 2px solid #28a745;
}

@media (prefers-color-scheme: dark) {
    .section-title-success {
        border-bottom: 2px solid #4ade80;
    }
}

/* 도움말 아이콘 스타일 */
.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    margin-left: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    position: relative;
}

.help-icon:hover {
    color: var(--button-bg);
}

/* 도움말 팝업 스타일 */
.help-popup {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 8px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    pointer-events: none;
}

.help-icon:hover + .help-popup,
.help-popup:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.help-popup-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    width: 600px;
    height: auto;
    max-height: 550px;
    box-sizing: border-box;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.help-popup-content h4 {
    margin: 0 0 8px 0;
    color: var(--text-primary);
    font-size: 32px;
    font-weight: 600;
    flex-shrink: 0;
}

.guide-images-container {
    position: relative;
    width: 100%;
    padding-top: 30px; /* 설명 문구 공간 확보 */
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    padding-left: 0;
    padding-right: 0;
}

.guide-image-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 65%; /* 이미지 영역 높이 조정 */
    overflow: visible;
    border-radius: 8px;
    flex-shrink: 0;
    margin: 0;
}

.guide-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    display: flex;
    flex-direction: column;
}

.guide-slide.active {
    opacity: 1;
}

.guide-caption {
    position: absolute;
    top: -30px;
    left: 0;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
    z-index: 10;
    white-space: nowrap;
    width: 100%;
    text-align: left;
    margin-bottom: 0;
}

.guide-slide:not(.active) .guide-caption {
    opacity: 0;
}

.guide-slide.active .guide-caption {
    opacity: 1;
}

.guide-image {
    width: 95%;
    height: 95%;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
}

.guide-indicators {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: auto;
    margin-bottom: 4px;
    padding-top: 8px;
    padding-bottom: 0;
    flex-shrink: 0;
    position: relative;
    z-index: 100;
}

.guide-indicator {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: background 0.3s ease;
}

.guide-indicator.active {
    background: var(--button-bg);
}

@media (prefers-color-scheme: dark) {
    .help-popup-content {
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    }
}

/* 섹션 구분선 */
.section-divider {
    margin: 24px 0;
    border: none;
    border-top: 2px solid var(--border-color);
    background: none;
}

/* 섹션 설명 */
.section-description {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

/* Excel 드롭존 스타일 */
.excel-drop-zone {
    background-color: var(--bg-secondary);
    border: 2px dashed #28a745;
}

@media (prefers-color-scheme: dark) {
    .excel-drop-zone {
        border-color: #4ade80;
    }
}

/* 경고 박스 */
.warning-box {
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    color: #856404;
}

@media (prefers-color-scheme: dark) {
    .warning-box {
        background-color: #78350f;
        border-color: #fbbf24;
        color: #fef3c7;
    }
}

/* 페이지 제목 및 텍스트 */
.page-container h1 {
    color: var(--text-primary);
}

.page-container p {
    color: var(--text-secondary);
}

.page-container h2 {
    color: var(--text-primary);
}

/* 좌우 2단 레이아웃 */
.two-column-layout {
    display: flex;
    gap: 24px;
    margin-top: 24px;
    align-items: stretch; /* 두 섹션의 높이를 동일하게 맞춤 */
}

.step-section {
    flex: 1;
    min-width: 0; /* flexbox에서 overflow 방지 */
    display: flex;
    flex-direction: column; /* 내부 요소들을 세로로 배치 */
}

.step-left {
    border-right: 2px solid var(--border-color);
    padding-right: 24px;
}

/* 1단계 드롭존 테두리 색상을 1단계 색상과 동일하게 설정 */
.step-left .drop-zone {
    border-color: var(--button-bg);
}

.step-right {
    padding-left: 24px;
}

/* 반응형: 작은 화면에서는 세로 배치 */
@media (max-width: 1024px) {
    .two-column-layout {
        flex-direction: column;
    }
    
    .step-left {
        border-right: none;
        border-bottom: 2px solid var(--border-color);
        padding-right: 0;
        padding-bottom: 24px;
    }
    
    .step-right {
        padding-left: 0;
        padding-top: 24px;
    }
}

/* 피드백 페이지 스타일 */
.feedback-form-section {
    margin: 24px 0;
    padding: 32px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feedback-form-section h2 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 24px;
}

.section-description {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.feedback-form {
    margin-top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group .required {
    color: var(--button-danger);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--button-bg);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
    line-height: 1.6;
}

.form-hint {
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.form-actions {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
}

.form-message {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    font-weight: 500;
}

.form-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.form-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
}

.feedback-list-section {
    margin: 24px 0;
}

.feedback-list-section h2 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 24px;
}

.feedback-write-section {
    margin: 32px 0;
    text-align: center;
}

.feedback-write-section .button {
    min-width: 200px;
    font-size: 18px;
    padding: 14px 28px;
}

.feedback-list {
    margin-bottom: 24px;
}

.feedback-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.feedback-table thead {
    background: var(--bg-tertiary);
}

.feedback-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.feedback-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.feedback-table tbody tr:hover {
    background: var(--hover-bg);
}

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

.col-number {
    width: 80px;
    text-align: center;
}

.col-department {
    width: 150px;
}

.col-author {
    width: 120px;
}

.col-content {
    min-width: 300px;
    word-break: break-word;
}

.col-date {
    width: 180px;
}

.col-actions {
    width: 100px;
    text-align: center;
}

.edit-btn,
.delete-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.2s ease;
    margin: 0 2px;
}

.edit-btn:hover,
.delete-btn:hover {
    background-color: var(--hover-bg);
}

.edit-btn:active {
    background-color: var(--button-bg);
    color: white;
}

.delete-btn:active {
    background-color: var(--button-danger);
    color: white;
}

.loading,
.empty-message,
.error-message {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.error-message {
    color: var(--button-danger);
}

/* 페이지네이션 스타일 */
.pagination {
    margin-top: 24px;
    display: flex;
    justify-content: center;
}

.pagination-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.pagination-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
}

.pagination-btn:hover:not(.disabled):not(.active) {
    background: var(--hover-bg);
    border-color: var(--button-bg);
}

.pagination-btn.active {
    background: var(--button-bg);
    color: white;
    border-color: var(--button-bg);
}

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

.pagination-ellipsis {
    padding: 8px 4px;
    color: var(--text-secondary);
}