/* 자료공유 스타일 */

/* === 헤더: 필터 + 정렬 === */
.rs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.rs-header-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 6px;
}

.rs-header-title .material-icons {
    color: var(--primary-color);
}

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

.rs-filter-select {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.85rem;
    font-family: inherit;
    background: var(--surface-color);
    color: var(--text-secondary-color);
    cursor: pointer;
}

/* === 검색 === */
.rs-search {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.rs-search input {
    flex: 1;
    min-width: 0;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.rs-search input:focus {
    border-color: var(--primary-color);
}

.rs-search button {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 10px;
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: background 0.15s;
}

.rs-search button:hover {
    background: var(--primary-dark);
}

.rs-search button .material-icons {
    font-size: 20px;
}

/* === 뱃지 (과목/유형) === */
.rs-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
}

/* 과목 뱃지 */
.rs-badge--essay         { background: #ede7f6; color: #4527a0; }
.rs-badge--curriculum    { background: #e3f2fd; color: #1565c0; }
.rs-badge--integrated    { background: #fff8e1; color: #f57f17; }
.rs-badge--korean        { background: #fce4ec; color: #c62828; }
.rs-badge--english       { background: #e8f5e9; color: #2e7d32; }
.rs-badge--math          { background: #fff3e0; color: #e65100; }
.rs-badge--science       { background: #e0f7fa; color: #00695c; }
.rs-badge--social        { background: #f3e5f5; color: #6a1b9a; }
.rs-badge--ethics        { background: #fbe9e7; color: #bf360c; }
.rs-badge--physical      { background: #e8eaf6; color: #283593; }
.rs-badge--music         { background: #fff8e1; color: #f57f17; }
.rs-badge--art           { background: #fce4ec; color: #ad1457; }
.rs-badge--practical     { background: #e0f2f1; color: #004d40; }
.rs-badge--other-subject { background: var(--surface-alt-color); color: var(--text-secondary-color); }

/* 유형 뱃지 */
.rs-badge--past-exam      { background: #ffebee; color: #b71c1c; }
.rs-badge--summary        { background: #e8f5e9; color: #1b5e20; }
.rs-badge--single-book    { background: #efebe9; color: #4e342e; }
.rs-badge--subject-essay  { background: #e0f7fa; color: #006064; }
.rs-badge--mock-exam      { background: #e3f2fd; color: #0d47a1; }
.rs-badge--study-material { background: #fff8e1; color: #f57f17; }
.rs-badge--lecture-note   { background: #f3e5f5; color: #4a148c; }
.rs-badge--other-type     { background: var(--surface-alt-color); color: var(--text-secondary-color); }

/* === 리스트 === */
.rs-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.rs-item {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    background: var(--surface-color);
    text-decoration: none;
    color: inherit;
    transition: background 0.15s;
    align-items: flex-start;
}

.rs-item:hover {
    background: var(--surface-alt-color);
}

.rs-item-main {
    flex: 1;
    min-width: 0;
}

.rs-item-title-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 4px;
}

.rs-item-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.rs-item:hover .rs-item-title {
    color: var(--primary-color);
}

.rs-item-file-count {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    color: var(--text-muted-color);
    font-size: 0.78rem;
}

.rs-item-file-count .material-icons {
    font-size: 14px;
}

.rs-item-meta {
    display: flex;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--text-muted-color);
    flex-wrap: wrap;
    align-items: center;
}

.rs-item-meta span {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.rs-item-meta .material-icons {
    font-size: 14px;
}

/* === 상세 페이지 === */
.rs-post-header {
    margin-bottom: 20px;
}

.rs-post-badges {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.rs-post-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 8px;
    line-height: 1.4;
}

.rs-post-info {
    display: flex;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--text-muted-color);
    align-items: center;
    flex-wrap: wrap;
}

.rs-post-info .material-icons {
    font-size: 14px;
}

.rs-post-body {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    line-height: 1.8;
    color: var(--text-color);
}

/* === 첨부파일 목록 === */
.rs-files {
    margin-top: 16px;
    padding: 16px;
    background: var(--surface-alt-color);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.rs-files-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.rs-files-title .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.rs-file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--surface-color);
    border-radius: 8px;
    margin-bottom: 6px;
    border: 1px solid var(--border-color);
    transition: border-color 0.15s;
}

.rs-file-item:last-child {
    margin-bottom: 0;
}

.rs-file-item:hover {
    border-color: var(--border-color);
}

.rs-file-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
}

.rs-file-icon--pdf  { background: #e53935; }
.rs-file-icon--hwp  { background: #1565c0; }
.rs-file-icon--docx { background: #2e7d32; }
.rs-file-icon--pptx { background: #e65100; }
.rs-file-icon--img  { background: #888; }

.rs-file-info {
    flex: 1;
    min-width: 0;
}

.rs-file-name {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rs-file-meta {
    font-size: 0.72rem;
    color: var(--text-muted-color);
    display: flex;
    gap: 8px;
    margin-top: 2px;
}

.rs-file-download {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-secondary-color);
    text-decoration: none;
    transition: all 0.15s;
}

.rs-file-download:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--tint-orange-bg);
}

.rs-file-download .material-icons {
    font-size: 18px;
}

/* 이미지 미리보기 */
.rs-image-previews {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
    margin-top: 12px;
}

.rs-image-previews img {
    width: 100%;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.15s;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.rs-image-previews img:hover {
    opacity: 0.9;
}

/* === 좋아요 + URL 복사 === */
.rs-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.rs-like-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--surface-color);
    color: var(--text-secondary-color);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    font-family: inherit;
}

.rs-like-btn:hover {
    border-color: var(--border-color);
    background: var(--surface-alt-color);
}

.rs-like-btn--active {
    border-color: #e53935;
    color: #e53935;
    background: #ffebee;
}

.rs-like-btn--active:hover {
    background: #ffcdd2;
}

.rs-like-btn .material-icons {
    font-size: 18px;
}

.rs-url-copy {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--surface-color);
    color: var(--text-secondary-color);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.rs-url-copy:hover {
    border-color: var(--border-color);
    background: var(--surface-alt-color);
}

.rs-url-copy .material-icons {
    font-size: 18px;
}

.rs-url-copy--copied {
    border-color: #4caf50;
    color: #4caf50;
    background: #e8f5e9;
}

/* === 댓글 === */
.rs-comments {
    margin-top: 24px;
}

.rs-comments-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
}

.rs-comment {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
}

.rs-comment-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.rs-comment-author {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
}

.rs-comment-author:hover {
    color: var(--primary-color);
}

.rs-comment-date {
    font-size: 0.75rem;
    color: var(--text-muted-color);
}

.rs-comment-body {
    font-size: 0.9rem;
    color: var(--text-color);
    line-height: 1.6;
}

.rs-comment--deleted {
    color: var(--text-muted-color);
    font-style: italic;
}

.rs-reply {
    margin-left: 40px;
    padding-left: 16px;
    border-left: 2px solid var(--border-color);
}

.rs-reply-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
    border: none;
    background: none;
    color: var(--text-muted-color);
    font-size: 0.78rem;
    cursor: pointer;
    font-family: inherit;
    margin-top: 4px;
}

.rs-reply-toggle:hover {
    color: var(--primary-color);
}

.rs-reply-toggle .material-icons {
    font-size: 16px;
}

.rs-reply-form {
    display: none;
    margin-top: 8px;
}

.rs-reply-form.active {
    display: flex;
    gap: 8px;
}

.rs-reply-form textarea {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    min-height: 60px;
    box-sizing: border-box;
}

.rs-reply-form button {
    align-self: flex-end;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.rs-comment-form {
    margin-top: 16px;
}

.rs-comment-form textarea {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    min-height: 80px;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s;
}

.rs-comment-form textarea:focus {
    border-color: var(--primary-color);
}

.rs-comment-form button {
    margin-top: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
}

/* === 파일 업로드 (작성 페이지) === */
.rs-file-input-hidden {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

.rs-file-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    background: var(--surface-alt-color);
    color: var(--text-secondary-color);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.15s;
    min-height: 44px;
}

.rs-file-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--tint-orange-bg);
}

.rs-file-btn .material-icons {
    font-size: 20px;
}

.rs-file-info {
    font-size: 0.78rem;
    color: var(--text-muted-color);
    margin-left: 8px;
}

.rs-file-upload {
    margin-top: 8px;
}

.rs-file-previews {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

.rs-file-preview-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--surface-alt-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.rs-file-preview-item .rs-file-name {
    flex: 1;
    min-width: 0;
    font-size: 0.85rem;
}

.rs-file-preview-item .remove-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: none;
    background: #e53935;
    color: white;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    flex-shrink: 0;
}

/* === 페이지네이션 === */
.rs-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
}

.rs-page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary-color);
    text-decoration: none;
    transition: background 0.15s;
}

.rs-page-btn:hover {
    background: var(--surface-alt-color);
}

.rs-page-info {
    font-size: 0.85rem;
    color: var(--text-muted-color);
}

/* === 빈 상태 === */
.rs-empty {
    padding: 48px 16px;
    text-align: center;
    color: var(--text-muted-color);
}

.rs-empty .material-icons {
    font-size: 48px;
    display: block;
    margin-bottom: 12px;
}

.rs-empty p {
    font-size: 0.92rem;
    margin: 0 0 4px;
}

/* === 카테고리 선택 (작성 페이지) === */
.rs-category-group {
    margin-bottom: 16px;
}

.rs-category-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary-color);
    margin-bottom: 6px;
}

.rs-category-select {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s;
}

.rs-category-select:focus {
    border-color: var(--primary-color);
}

/* === 모바일 === */
@media (max-width: 767px) {
    .rs-header {
        flex-direction: column;
        align-items: stretch;
    }

    .rs-controls {
        justify-content: flex-end;
    }

    .rs-item {
        padding: 14px 16px;
    }

    .rs-reply {
        margin-left: 24px;
        padding-left: 12px;
    }

    .rs-image-previews {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

    .rs-filter-select {
        font-size: 16px;
    }

    /* iOS 입력 확대 방지 */
    .rs-search input {
        font-size: 16px;
    }

    .rs-post-title {
        font-size: 1.15rem;
    }

    .rs-files {
        padding: 12px;
    }

    .rs-file-item {
        padding: 8px 10px;
    }
}

/* === 공지 배지 === */
.rs-notice-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 700;
    background: #ffebee;
    color: #e53935;
    flex-shrink: 0;
}

.rs-item--notice {
    background: var(--tint-yellow-bg);
}

.rs-item--notice:hover {
    background: var(--tint-yellow-bg-strong);
}