/* ====================================
   Paper Tab Styles - News/Magazine Reading Mode
   ==================================== */

/* Paper Feed Container */
.paper-feed {
    max-width: 100%;  /* 🆕 1200px → 100% (동영상과 동일) */
    margin: 0 auto;
    padding: 20px 0;  /* 상하만 패딩, 좌우는 그리드에서 처리 */
    position: relative;
    min-height: 400px;
}

/* ====================================
   Paper Admin Buttons in Category Panel
   ==================================== */

/* Category Panel Paper Admin Section */
.category-paper-admin {
    padding: 16px;
    border-top: 2px solid #eee;
    margin-top: 12px;
}

.bottom-sheet-paper-admin {
    padding: 16px;
    border-top: 2px solid #eee;
    margin-top: 12px;
}

.paper-admin-category-btn {
    width: 100%;
    padding: 12px 16px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
    margin-bottom: 8px;
}

.paper-admin-category-btn:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
    transform: translateY(-2px);
}

.paper-admin-category-btn:active {
    transform: translateY(0);
}

.paper-logout-category-btn {
    width: 100%;
    padding: 10px 16px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.paper-logout-category-btn:hover {
    background: #7f8c8d;
}

/* OLD Paper Admin Controls (REMOVED) */
.paper-admin-controls {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px;
    background: white;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: var(--header-height);
    z-index: 100;
}

.paper-add-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
}

.paper-add-btn:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
    transform: translateY(-2px);
}

.paper-add-btn:active {
    transform: translateY(0);
}

.paper-logout-btn {
    padding: 10px 20px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-logout-btn:hover {
    background: #7f8c8d;
}

/* Paper Cards Grid - 동영상 메인과 동일한 반응형 레이아웃 */
.paper-cards-grid {
    display: grid;
    gap: 16px;
    margin-top: 20px;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
    padding: 0 16px;  /* 기본 패딩 (모바일) */
    position: relative;
}

/* Responsive Grid Layout */
/* 모바일: 1줄에 1개 (가로 꽉 참) */
@media (max-width: 767px) {
    .paper-cards-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 0 16px;  /* 터치 영역 고려 */
    }
}

/* 태블릿: 1줄에 2개 (카테고리 패널 없음) */
@media (min-width: 768px) and (max-width: 1023px) {
    .paper-cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        padding: 0 16px;  /* 터치 영역 고려 */
    }
}

/* 데스크톱: 1줄에 3개 (우측 카테고리 패널 280px 고려) */
@media (min-width: 1024px) and (max-width: 1919px) {
    .paper-cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 18px;
        padding: 0 8px;  /* 좌우 패딩 최소화 */
    }
}

/* FHD: 1줄에 정확히 4개 (카테고리 패널 280px 고려, 화면 꽉 참) */
@media (min-width: 1920px) and (max-width: 2559px) {
    .paper-cards-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        padding: 0 8px;  /* 좌우 패딩 최소화 - 화면 꽉 참 ★ */
    }
}

/* Ultra-wide: 1줄에 5개 이상 (카테고리 패널 280px 고려) */
@media (min-width: 2560px) {
    .paper-cards-grid {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
        gap: 24px;
        padding: 0 12px;  /* 좌우 패딩 최소화 */
    }
}

/* Paper Card */
.paper-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
    border-left: 4px solid #e74c3c;
    position: relative;
}

.paper-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

.paper-card-thumbnail {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.paper-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.paper-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.8), rgba(192, 57, 43, 0.8));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.paper-card:hover .paper-card-overlay {
    opacity: 1;
}

.paper-card-overlay i {
    font-size: 3rem;
    color: white;
}

.paper-card-content {
    padding: 20px;
}

.paper-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-card-description {
    font-size: 0.9rem;
    color: #7f8c8d;
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #95a5a6;
}

.paper-card-category {
    background: #e74c3c;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.paper-card-read-time {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Paper Card Admin Actions */
.paper-card-actions {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    gap: 8px;
    z-index: 10;
}

.paper-action-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.paper-edit-btn {
    background: rgba(52, 152, 219, 0.9);
}

.paper-edit-btn:hover {
    background: rgba(41, 128, 185, 1);
    transform: scale(1.1);
}

.paper-delete-btn {
    background: rgba(231, 76, 60, 0.9);
}

.paper-delete-btn:hover {
    background: rgba(192, 57, 43, 1);
    transform: scale(1.1);
}

/* Empty State */
.paper-empty-state {
    text-align: center;
    padding: 80px 20px;
}

.paper-empty-state i {
    font-size: 4rem;
    color: #bdc3c7;
    margin-bottom: 20px;
}

.paper-empty-state h3 {
    font-size: 1.3rem;
    color: #7f8c8d;
    margin-bottom: 12px;
}

.paper-empty-state p {
    font-size: 0.95rem;
    color: #95a5a6;
}

/* ====================================
   Paper Registration Modal
   ==================================== */

.paper-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
}

.paper-modal.active {
    display: flex;
}

.paper-modal-content {
    background: white;
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.paper-modal-header {
    padding: 24px;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.paper-modal-header h2 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin: 0;
}

.paper-modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: #ecf0f1;
    color: #7f8c8d;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-modal-close:hover {
    background: #e74c3c;
    color: white;
    transform: rotate(90deg);
}

.paper-modal-body {
    padding: 24px;
}

/* Paper Form */
.paper-form-group {
    margin-bottom: 20px;
}

.paper-form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
}

.paper-form-group input,
.paper-form-group textarea,
.paper-form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.paper-form-group input:focus,
.paper-form-group textarea:focus,
.paper-form-group select:focus {
    outline: none;
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.paper-form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.paper-form-note {
    font-size: 0.85rem;
    color: #95a5a6;
    margin-top: 6px;
}

/* URL Input Group with Duplicate Check */
.paper-url-input-group {
    display: flex;
    gap: 8px;
    align-items: stretch;
}

.paper-url-input-group input {
    flex: 1;
}

.paper-duplicate-check-btn {
    padding: 12px 20px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.paper-duplicate-check-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.paper-duplicate-check-btn:active {
    transform: translateY(0);
}

.paper-duplicate-check-btn i {
    font-size: 1rem;
}

/* Duplicate Check Result */
.paper-duplicate-result {
    margin-top: 10px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    display: none;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.paper-duplicate-result.show {
    display: block;
}

.paper-duplicate-result.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.paper-duplicate-result.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.paper-duplicate-result.warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.paper-duplicate-result i {
    margin-right: 8px;
}

/* Preview Section */
.paper-preview-section {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 16px;
    margin-top: 20px;
    display: none;
}

.paper-preview-section.active {
    display: block;
}

.paper-preview-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #7f8c8d;
    margin-bottom: 12px;
}

.paper-preview-content {
    background: white;
    border-radius: 8px;
    padding: 16px;
}

/* Form Actions */
.paper-form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #eee;
}

.paper-form-btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-preview-btn {
    background: #3498db;
    color: white;
}

.paper-preview-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.paper-save-btn {
    background: #27ae60;
    color: white;
}

.paper-save-btn:hover {
    background: #229954;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

.paper-cancel-btn {
    background: #95a5a6;
    color: white;
}

.paper-cancel-btn:hover {
    background: #7f8c8d;
}

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

/* 🆕 Loading State - Fixed Center (No Animation) - v3.7.59 */
.paper-loading {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    text-align: center;
    padding: 24px 32px;
    color: #7f8c8d;
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 10000 !important;
    max-width: 400px;
    min-width: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    pointer-events: none;
    /* 🆕 애니메이션 완전 제거 */
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
}

/* 모바일 최적화 */
@media (max-width: 768px) {
    .paper-loading {
        padding: 20px 24px;
        min-width: auto;
        max-width: 90%;
        gap: 6px;
        /* 🆕 모바일도 중앙 고정 */
        position: fixed !important;
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%) !important;
    }
}

@media (max-width: 480px) {
    .paper-loading {
        padding: 16px 20px;
        max-width: 85%;
        gap: 5px;
    }
    
    .paper-loading p {
        font-size: 0.85rem;
        line-height: 1.3;
        word-break: keep-all;
        margin: 0;
        white-space: nowrap;  /* 🔥 v3.7.72 - 1줄 강제 */
    }
}

/* HASRI AI 로딩 아이콘 */
.paper-loading-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 4px;
}

/* 모바일 아이콘 크기 조정 */
@media (max-width: 480px) {
    .paper-loading-icon {
        width: 56px;
        height: 56px;
        margin-bottom: 2px;
    }
}

/* HASRI AI 브랜드 텍스트 (🔥 v3.7.69 - 반응형 최적화) */
.paper-loading-brand {
    font-size: 1.15rem;
    font-weight: 700;
    background: linear-gradient(135deg, #DC143C, #B71C1C);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2px;
    letter-spacing: 1.5px;
    animation: pulse 2s ease-in-out infinite;
    white-space: nowrap;  /* 🔥 1줄 강제 */
}

/* 모바일 브랜드 텍스트 (🔥 v3.7.69 - 더 작게) */
@media (max-width: 480px) {
    .paper-loading-brand {
        font-size: 0.95rem;
        letter-spacing: 1px;
        margin-bottom: 1px;
    }
}

/* 초소형 모바일 (🔥 v3.7.69 - 추가) */
@media (max-width: 360px) {
    .paper-loading-brand {
        font-size: 0.85rem;
        letter-spacing: 0.5px;
    }
}

/* Fallback: FontAwesome Spinner (if SVG fails) */
.paper-loading i {
    font-size: 2rem;
    margin-bottom: 12px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 🆕 HASRI AI 깜박임 애니메이션 */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ====================================
   Paper Viewer Modal (Reading Mode)
   ==================================== */

.paper-viewer-modal {
    position: fixed;
    inset: 0;
    background: #fafafa; /* Slightly off-white for better reading */
    z-index: 10000;
    display: none;
    overflow-y: auto;
    overflow-x: hidden;
}

.paper-viewer-modal.active {
    display: block;
    animation: slideInFromRight 0.3s ease-out;
}

@keyframes slideInFromRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Progress Bar (top) */
.paper-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #e74c3c, #c0392b);
    width: 0%;
    z-index: 10002;
    transition: width 0.1s ease-out;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

/* Header (auto-hide) */
.paper-viewer-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10001;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease-out, opacity 0.3s ease-out;
}

.paper-viewer-header.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.paper-viewer-title-bar {
    flex: 1;
    margin: 0 16px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #2c3e50;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    transition: opacity 0.3s ease;
    max-width: 60%; /* 제목 너비 제한 - 버튼과 겹치지 않도록 */
}

.paper-viewer-title-bar.visible {
    opacity: 1;
}

.paper-viewer-back-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #2c3e50;
    font-size: 1.2rem;
}

.paper-viewer-back-btn:hover {
    background: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
    transform: scale(1.1);
}

.paper-viewer-back-btn:active {
    transform: scale(0.95);
}

.paper-viewer-actions {
    display: flex;
    gap: 8px;
}

.paper-viewer-action-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #7f8c8d;
    font-size: 1rem;
}

.paper-viewer-action-btn:hover {
    background: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
    transform: scale(1.1);
}

.paper-viewer-action-btn:active {
    transform: scale(0.95);
}

/* Container */
.paper-viewer-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 120px 24px 100px; /* 🆕 Top padding 증가 (100px → 120px) - 헤더 높이 고려 */
    min-height: 100vh;
}

/* Title */
.paper-viewer-title {
    font-size: 2rem;
    line-height: 1.4;
    color: #2c3e50;
    margin: 0 0 16px 0;
    font-weight: 700;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Meta Info */
.paper-viewer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 16px 0;
    border-bottom: 2px solid #ecf0f1;
    margin-bottom: 32px;
    font-size: 0.9rem;
    color: #7f8c8d;
    animation: fadeInUp 0.6s ease-out;
}

.paper-viewer-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.paper-viewer-meta i {
    color: #e74c3c;
}

/* Content */
.paper-viewer-content {
    font-family: 'Noto Serif KR', Georgia, serif;
    font-size: 1.1rem;
    line-height: 1.9;
    color: #34495e;
    /* 🔥 v3.7.65 - 애니메이션 완전 제거 (로딩 UI fadeInUp 방지) */
    animation: none !important;
}

/* 🔥 v3.7.65 CRITICAL - Paper 로딩 UI: 애니메이션 완전 제거 + 즉시 중앙 고정 */
.paper-viewer-content .paper-loading {
    /* 🔥 부모 fadeInUp 애니메이션 상속 차단 */
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    
    /* 🔥 중앙 위치 즉시 고정 (위에서 내려오지 않음) */
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    
    /* 🔥 최상위 레이어 + 레이아웃 독립 */
    z-index: 10000 !important;
    will-change: auto !important;
    contain: layout style paint !important;
    isolation: isolate !important;
    
    /* 스타일 유지 */
    margin: 0 !important;
    padding: 24px 32px !important;
}

/* 🆕 Paper viewer 모달 자체도 애니메이션 없애기 */
.paper-viewer-modal.active .paper-viewer-content {
    animation: none !important;
}

.paper-viewer-modal .paper-viewer-content {
    animation: none !important;
}

/* 🆕 Paper 뷰어 로딩 시 배경 오버레이 (v3.7.59) */
.paper-viewer-modal.active .paper-loading::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 250, 250, 0.95);
    z-index: -1;
}

.paper-viewer-content p {
    margin: 1.5em 0;
}

.paper-viewer-content h1,
.paper-viewer-content h2,
.paper-viewer-content h3 {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 700;
    color: #2c3e50;
    margin: 2em 0 1em;
    line-height: 1.4;
}

.paper-viewer-content h1 {
    font-size: 1.8rem;
}

.paper-viewer-content h2 {
    font-size: 1.5rem;
}

.paper-viewer-content h3 {
    font-size: 1.3rem;
}

.paper-viewer-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 2em auto;
    display: block;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.paper-viewer-content blockquote {
    border-left: 4px solid #e74c3c;
    padding: 16px 24px;
    margin: 2em 0;
    background: rgba(231, 76, 60, 0.05);
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #555;
}

.paper-viewer-content a {
    color: #e74c3c;
    text-decoration: none;
    border-bottom: 1px solid rgba(231, 76, 60, 0.3);
    transition: all 0.2s ease;
}

.paper-viewer-content a:hover {
    border-bottom-color: #e74c3c;
    background: rgba(231, 76, 60, 0.05);
}

.paper-viewer-content ul,
.paper-viewer-content ol {
    margin: 1.5em 0;
    padding-left: 2em;
}

.paper-viewer-content li {
    margin: 0.5em 0;
}

.paper-viewer-content code {
    background: #f8f9fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: #e74c3c;
}

.paper-viewer-content pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2em 0;
}

.paper-viewer-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* Scroll to Top Button */
.paper-scroll-top-btn {
    position: fixed;
    bottom: 80px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    display: none; /* Hidden by default */
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(231, 76, 60, 0.4);
    z-index: 1000;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.paper-scroll-top-btn.visible {
    display: flex;
    animation: bounceIn 0.5s ease-out;
}

.paper-scroll-top-btn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 24px rgba(231, 76, 60, 0.5);
}

.paper-scroll-top-btn:active {
    transform: translateY(-2px) scale(0.95);
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}
    border-radius: 50%;
    border: none;
    background: #ecf0f1;
    color: #2c3e50;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-viewer-back-btn:hover {
    background: #e74c3c;
    color: white;
}

.paper-viewer-actions {
    display: flex;
    gap: 8px;
}

.paper-viewer-action-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: #ecf0f1;
    color: #2c3e50;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-viewer-action-btn:hover {
    background: #3498db;
    color: white;
}

/* Paper Viewer Content - Title (중복 정의 제거, 808번 줄 사용) */
.paper-viewer-title {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    line-height: 1.3;
    margin-bottom: 20px;
    font-family: 'Noto Serif KR', serif;
}

.paper-viewer-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-bottom: 20px;
    margin-bottom: 32px;
    border-bottom: 2px solid #eee;
    font-size: 0.9rem;
    color: #7f8c8d;
}

.paper-viewer-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.paper-viewer-meta a {
    color: #3498db;
    text-decoration: none;
    transition: color 0.3s ease;
}

.paper-viewer-meta a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* Paper Content (Readability Output) */
.paper-viewer-content {
    font-family: 'Noto Serif KR', serif;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #34495e;
}

.paper-viewer-content p {
    margin-bottom: 20px;
}

.paper-viewer-content h1,
.paper-viewer-content h2,
.paper-viewer-content h3,
.paper-viewer-content h4 {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 700;
    color: #2c3e50;
    margin-top: 32px;
    margin-bottom: 16px;
    line-height: 1.4;
}

.paper-viewer-content h1 { font-size: 1.8rem; }
.paper-viewer-content h2 { font-size: 1.5rem; }
.paper-viewer-content h3 { font-size: 1.3rem; }
.paper-viewer-content h4 { font-size: 1.1rem; }

.paper-viewer-content img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 24px 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.paper-viewer-content a {
    color: #3498db;
    text-decoration: none;
    border-bottom: 1px solid #3498db;
    transition: all 0.3s ease;
}

.paper-viewer-content a:hover {
    color: #2980b9;
    border-bottom-color: #2980b9;
}

.paper-viewer-content blockquote {
    border-left: 4px solid #e74c3c;
    padding-left: 20px;
    margin: 24px 0;
    font-style: italic;
    color: #7f8c8d;
}

.paper-viewer-content ul,
.paper-viewer-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.paper-viewer-content li {
    margin-bottom: 8px;
}

.paper-viewer-content code {
    background: #f8f9fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: #e74c3c;
}

.paper-viewer-content pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 24px 0;
}

.paper-viewer-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

/* ====================================
   Login Modal
   ==================================== */

.paper-login-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
}

.paper-login-modal.active {
    display: flex;
}

.paper-login-content {
    background: white;
    border-radius: 16px;
    padding: 32px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.paper-login-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.paper-login-header h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin: 0;
}

.paper-login-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #95a5a6;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.paper-login-close:hover {
    color: #e74c3c;
}

.paper-login-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.paper-login-body p {
    color: #7f8c8d;
    margin: 0 0 8px 0;
    font-size: 0.95rem;
}

/* Password Input with Toggle */
.password-input-wrapper {
    position: relative;
    width: 100%;
}

.paper-password-input {
    width: 100%;
    padding: 12px 45px 12px 16px; /* Right padding for toggle button */
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.paper-password-input:focus {
    outline: none;
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.password-toggle-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: #95a5a6;
    transition: color 0.2s;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.password-toggle-btn:hover {
    color: #e74c3c;
}

.password-toggle-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.paper-login-error {
    color: #e74c3c;
    font-size: 0.9rem;
    text-align: center;
    min-height: 20px;
    display: none;
}

.paper-login-error.show {
    display: block;
}

.paper-login-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.paper-btn-secondary {
    flex: 1;
    padding: 12px 24px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-btn-secondary:hover {
    background: #7f8c8d;
}

.paper-btn-primary {
    flex: 1;
    padding: 12px 24px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-btn-primary:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
}

.paper-login-title {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 24px;
    text-align: center;
}

.paper-login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.paper-login-input {
    padding: 12px 16px;
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.paper-login-input:focus {
    outline: none;
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.paper-login-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-login-btn:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
}

.paper-login-cancel {
    padding: 12px 24px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.paper-login-cancel:hover {
    background: #7f8c8d;
}

.paper-login-error {
    color: #e74c3c;
    font-size: 0.85rem;
    text-align: center;
    display: none;
}

.paper-login-error.active {
    display: block;
}

/* ====================================
   Responsive Design
   ==================================== */

@media (max-width: 768px) {
    .paper-cards-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    /* Paper Viewer 모바일 최적화 */
    .paper-viewer-container {
        padding: 80px 16px 60px;
        max-width: 100%;
    }
    
    .paper-viewer-header {
        padding: 10px 16px;
    }
    
    .paper-viewer-title-bar {
        font-size: 0.85rem;
        max-width: 55%;
    }
    
    .paper-viewer-back-btn,
    .paper-viewer-action-btn {
        width: 36px;
        height: 36px;
        font-size: 0.95rem;
    }
    
    .paper-viewer-title {
        font-size: 1.5rem;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    .paper-viewer-meta {
        font-size: 0.85rem;
        gap: 10px;
        padding: 12px 0;
        margin-bottom: 24px;
    }
    
    .paper-viewer-content {
        font-size: 1rem;
        line-height: 1.7;
    }
    
    .paper-viewer-content h1 {
        font-size: 1.5rem;
        margin: 1.5em 0 0.8em;
    }
    
    .paper-viewer-content h2 {
        font-size: 1.3rem;
        margin: 1.5em 0 0.8em;
    }
    
    .paper-viewer-content h3 {
        font-size: 1.1rem;
        margin: 1.5em 0 0.8em;
    }
    
    .paper-viewer-content p {
        margin: 1.2em 0;
    }
    
    .paper-viewer-content img {
        margin: 1.5em auto;
        border-radius: 8px;
    }
    
    .paper-viewer-content blockquote {
        padding: 12px 16px;
        margin: 1.5em 0;
        font-size: 0.95rem;
    }
    
    .paper-scroll-top-btn {
        bottom: 70px;
        right: 16px;
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
    
    .paper-admin-controls {
        flex-wrap: wrap;
    }
    
    .paper-form-actions {
        flex-direction: column;
    }
    
    .paper-form-btn {
        width: 100%;
    }
    
    /* Mobile: URL Input Group (Stack vertically) */
    .paper-url-input-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .paper-duplicate-check-btn {
        width: 100%;
        justify-content: center;
    }
}

/* 작은 모바일 화면 (480px 이하) */
@media (max-width: 480px) {
    .paper-viewer-container {
        padding: 70px 12px 50px;
    }
    
    .paper-viewer-header {
        padding: 8px 12px;
    }
    
    .paper-viewer-title-bar {
        font-size: 0.8rem;
        max-width: 50%;
    }
    
    .paper-viewer-back-btn,
    .paper-viewer-action-btn {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
    
    .paper-viewer-title {
        font-size: 1.3rem;
        margin-bottom: 10px;
    }
    
    .paper-viewer-meta {
        font-size: 0.8rem;
        gap: 8px;
        padding: 10px 0;
        margin-bottom: 20px;
    }
    
    .paper-viewer-content {
        font-size: 0.95rem;
        line-height: 1.65;
    }
    
    .paper-viewer-content h1 {
        font-size: 1.3rem;
    }
    
    .paper-viewer-content h2 {
        font-size: 1.15rem;
    }
    
    .paper-viewer-content h3 {
        font-size: 1.05rem;
    }
    
    .paper-scroll-top-btn {
        bottom: 60px;
        right: 12px;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .paper-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}