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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 헤더 스타일 */
header {
    background-color: #fff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-bottom: 3px solid #3498db;
    margin-bottom: 2rem;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

nav a {
    text-decoration: none;
    color: #666;
    margin-right: 1.5rem;
    padding: 0.5rem 0;
    position: relative;
}

nav a.active {
    color: #3498db;
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #3498db;
}

/* 메인 컨테이너 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 필터 스타일 */
.filters {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
}

select {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

/* 필기 카드 그리드 */
.note-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.note-card {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s;
    border: 1px solid #e1e1e1;
}

/* 파일 입력 스타일 */
.file-inputs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-inputs > div {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.file-inputs label {
    color: #666;
    font-size: 0.9rem;
}

/* 수정/삭제 버튼 스타일 */
.note-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.edit-btn,
.delete-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.edit-btn {
    background-color: #f39c12;
    color: #fff;
}

.delete-btn {
    background-color: #e74c3c;
    color: #fff;
}

.edit-btn:hover {
    background-color: #d68910;
}

.delete-btn:hover {
    background-color: #c0392b;
}

.no-notes-message {
    text-align: center;
    padding: 2rem;
    color: #666;
    font-size: 1.2rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    margin: 2rem auto;
    max-width: 600px;
}

/* 첨부파일 배지 스타일 */
.pdf-badge,
.image-badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-top: 1rem;
    color: #fff;
}

.pdf-badge {
    background-color: #3498db;
}

.image-badge {
    background-color: #2ecc71;
}

/* 기타 제목 입력 필드 스타일 */
#customTitle {
    margin-top: 0.5rem;
}

.note-card:hover {
    transform: translateY(-5px);
}

.note-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.note-card .meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
}

.note-card .content {
    margin-bottom: 1rem;
    color: #666;
}

.note-card .view-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.note-card .view-btn:hover {
    background-color: #2980b9;
}

/* 업로드 폼 스타일 */
.upload-form {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    resize: vertical;
}

.submit-btn {
    background-color: #3498db;
    color: #fff;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    width: 100%;
    transition: background-color 0.2s;
}

.submit-btn:hover {
    background-color: #2980b9;
}

/* 상세 보기 페이지 스타일 */
.view-container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.note-details .note-header {
    margin-bottom: 2rem;
}

.note-details .note-meta {
    color: #666;
    margin-top: 0.5rem;
}

.note-details .note-meta span {
    margin-right: 1rem;
}

.note-content {
    margin-bottom: 2rem;
}

.pdf-container {
    margin-bottom: 2rem;
}

.actions {
    display: flex;
    gap: 1rem;
}

.download-btn,
.back-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.download-btn {
    background-color: #3498db;
    color: #fff;
}

.back-btn {
    background-color: #95a5a6;
    color: #fff;
}

.download-btn:hover {
    background-color: #2980b9;
}

.back-btn:hover {
    background-color: #7f8c8d;
}

/* 수정/삭제/공유 버튼 스타일 */
.edit-btn,
.delete-btn,
.share-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: background-color 0.2s;
    margin-right: 0.5rem;
}

.edit-btn {
    background-color: #f39c12;
    color: #fff;
}

.delete-btn {
    background-color: #e74c3c;
    color: #fff;
}

.share-btn {
    background-color: #17a2b8;
    color: #fff;
}

.edit-btn:hover {
    background-color: #e67e22;
}

.delete-btn:hover {
    background-color: #c0392b;
}

.share-btn:hover {
    background-color: #138496;
}

/* 노트 액션 버튼 컨테이너 */
.note-actions {
    margin-top: 1rem;
    text-align: center;
}

.note-actions .view-btn {
    background-color: #3498db;
    color: #fff;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s;
}

.note-actions .view-btn:hover {
    background-color: #2980b9;
}

/* 첨부파일 아이콘 스타일 */
.note-header-with-icons {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.note-header-with-icons h3 {
    margin: 0;
    flex: 1;
}

.attachment-icons {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.attachment-icon {
    font-size: 1.2rem;
    padding: 0.2rem;
    border-radius: 4px;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    cursor: help;
    transition: transform 0.2s;
}

.attachment-icon:hover {
    transform: scale(1.1);
}

.pdf-icon {
    color: #dc3545;
}

.image-icon {
    color: #28a745;
}

/* 이미지 컨테이너 스타일 */
.image-container {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #dee2e6;
}

.image-container h3 {
    margin-top: 0;
    color: #495057;
}