/* Common Page Styles */
.page-wrapper {
    padding: 40px 0;
}

.page-header {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.page-header h1 {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.page-subtitle {
    font-size: 18px;
    color: #666;
    font-weight: 400;
}

/* =========================
   CV PAGE STYLES
   ========================= */

/* CV Download Section */
.cv-download-section {
    background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%);
    border-radius: 16px;
    padding: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.cv-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.cv-info i {
    font-size: 48px;
    color: var(--primary-color);
}

.cv-details h3 {
    font-size: 24px;
    margin-bottom: 5px;
    color: var(--text-color);
}

.cv-details p {
    color: #666;
    font-size: 20px;
}

.download-btn {
    background-color: var(--primary-color);
    color: #fff;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    transition: all 0.3s;
}

.download-btn:hover {
    background-color: var(--link-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(165, 20, 23, 0.3);
}

/* PDF Viewer Section */
.pdf-viewer-section {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 40px;
}

.pdf-viewer-header {
    background: #f8f8f8;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.pdf-viewer-header h2 {
    font-size: 20px;
    color: var(--text-color);
    margin: 0;
}

.pdf-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.pdf-btn {
    background: #fff;
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.pdf-btn:hover {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

#pageInfo {
    font-size: 14px;
    color: #666;
    padding: 0 10px;
}

.pdf-container {
    height: 800px;
    background: #f5f5f5;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
}

#pdf-canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.pdf-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    color: #666;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-loading:before {
    content: "";
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Quick Links */
.cv-quick-links {
    margin-top: 50px;
}

.cv-quick-links h2 {
    font-size: 28px;
    margin-bottom: 30px;
    text-align: center;
    color: var(--text-color);
}

.quick-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.quick-link-card {
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
}

.quick-link-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.quick-link-card i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.quick-link-card span {
    font-size: 16px;
    font-weight: 600;
    display: block;
}

/* =========================
   RESEARCH PAGE STYLES
   ========================= */

/* Research Introduction */
.research-intro {
    margin-bottom: 50px;
}

.intro-text {
    font-size: 20px;
    line-height: 1.85;
    color: #555;
    text-align: justify;
    padding: 30px;
    background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%);
    border-radius: 12px;
}

/* Research Level Sections */
.research-level-section {
    margin-bottom: 60px;
}

.research-level-section .section-label {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 25px;
}

.section-content {
    padding-left: 20px;
}

.section-description {
    font-size: 20px;
    line-height: 1.85;
    color: #555;
    margin-bottom: 30px;
    text-align: justify;
}

/* Publications List (Research) */
.research-level-section .publications-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.publication-entry {
    padding: 20px;
    background: #fff;
    border-left: 3px solid var(--primary-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.publication-entry:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.publication-text {
    font-size: 20px;
    line-height: 1.7;
    color: #444;
    margin-bottom: 10px;
}

.publication-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

.publication-text em {
    font-style: italic;
}

.publication-entry .pub-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
}

.publication-entry .pub-link:hover {
    color: var(--link-hover);
    transform: translateX(3px);
}

.publication-entry .pub-link i {
    font-size: 20px;
}

/* =========================
   TEACHING PAGE STYLES
   ========================= */

/* Teaching Section */
.teaching-section {
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 25px;
}

/* Pedagogy Section */
.pedagogy-content p {
    font-size: 16px;
    line-height: 1.85;
    color: #555;
    margin-bottom: 20px;
    text-align: justify;
}

.pedagogy-list {
    margin-top: 30px;
}

.pedagogy-item {
    margin-bottom: 30px;
    padding: 25px;
    background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s;
}

.pedagogy-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.pedagogy-item h3 {
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pedagogy-item h3 i {
    color: var(--primary-color);
    font-size: 20px;
}

.pedagogy-item p {
    font-size: 18px;
    line-height: 1.8;
    color: #666;
    margin: 0;
}

/* Courses Table Section */
.courses-table {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.university-courses {
    display: flex;
    align-items: center;
    gap: 30px;
    padding: 25px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s;
}

.university-courses:hover {
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.university-logo {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8f8f8;
    border-radius: 12px;
    padding: 10px;
}

.university-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.university-info h3 {
    font-size: 18px;
    color: var(--text-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.course-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.course-list li {
    padding: 8px 0;
    color: #666;
    font-size: 16px;
    position: relative;
    padding-left: 20px;
}

.course-list li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Student Quotes Section */
.student-quotes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.quote-card {
    background: linear-gradient(135deg, #fff 0%, #f9f9f9 100%);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    position: relative;
    transition: all 0.3s;
}

.quote-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.quote-icon {
    font-size: 24px;
    color: var(--primary-color);
    opacity: 0.3;
    position: absolute;
    top: 20px;
    left: 25px;
}

.quote-card p {
    font-size: 18px;
    line-height: 1.8;
    color: #555;
    font-style: italic;
    margin: 15px 0 20px 30px;
}

.quote-source {
    display: block;
    text-align: right;
    font-size: 15px;
    color: #999;
    font-weight: 500;
}

/* Teaching Resources (reusing from original) */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.resource-card {
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
}

.resource-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.resource-card i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: block;
}

.resource-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.resource-card p {
    font-size: 16px;
    color: #666;
}

/* =========================
   NEWS PAGE STYLES
   ========================= */

/* News Controls */
.news-controls {
    margin-bottom: 40px;
}

.search-bar {
    margin-bottom: 20px;
}

.news-search-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
}

.news-search-input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid var(--border-color);
    border-right: none;
    border-radius: 25px 0 0 25px;
    font-size: 15px;
}

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

.news-search-btn {
    padding: 12px 25px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 0 25px 25px 0;
    cursor: pointer;
    transition: all 0.3s;
}

.news-search-btn:hover {
    background: var(--link-hover);
}

.news-filters {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-chip {
    padding: 8px 20px;
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    font-weight: 500;
}

.filter-chip:hover {
    border-color: var(--primary-color);
}

.filter-chip.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* News Grid */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.news-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.news-card-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
    overflow: hidden;
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-category {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--primary-color);
    color: #fff;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.news-card-content {
    padding: 25px;
}

.news-meta {
    margin-bottom: 15px;
}

.news-date {
    font-size: 13px;
    color: #fff;
    display: block;
    margin-bottom: 8px;
}

.news-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.news-tag {
    background: #f0f0f0;
    color: #666;
    font-size: 11px;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s;
}

.news-tag:hover {
    background: var(--primary-color);
    color: #fff;
    cursor: pointer;
}

.news-title {
    margin-bottom: 15px;
}

.news-title a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    transition: color 0.3s;
}

.news-title a:hover {
    color: var(--primary-color);
}

.news-excerpt {
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 15px;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s;
}

.read-more:hover {
    gap: 10px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.page-btn,
.page-number {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    background: #fff;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    font-weight: 500;
}

.page-btn:hover:not(:disabled),
.page-number:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.page-number.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.page-dots {
    padding: 0 10px;
    color: #999;
}

/* =========================
   RESPONSIVE DESIGN
   ========================= */

@media (max-width: 768px) {
    .page-header h1 {
        font-size: 32px;
    }

    .page-subtitle {
        font-size: 16px;
    }

    /* CV Page Mobile */
    .cv-download-section {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }

    .cv-info {
        flex-direction: column;
    }

    .pdf-container {
        height: 500px;
    }

    .pdf-controls {
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }

    .pdf-viewer-header {
        padding: 15px;
        flex-direction: column;
        gap: 15px;
    }

    .pdf-viewer-header h2 {
        font-size: 18px;
    }

    .pdf-btn {
        padding: 10px 12px;
        min-width: 44px;
    }

    #pageInfo {
        font-size: 12px;
        order: -1;
    }

    /* Research Page Mobile */
    .intro-text {
        padding: 20px;
        font-size: 15px;
        text-align: left;
    }

    .section-content {
        padding-left: 10px;
    }

    .section-description {
        font-size: 15px;
        text-align: left;
    }

    .publication-entry {
        padding: 15px;
    }

    .publication-text {
        font-size: 14px;
    }

    /* Teaching Page Mobile */
    .pedagogy-item {
        padding: 20px;
    }

    .pedagogy-item h3 {
        font-size: 16px;
    }

    .university-courses {
        flex-direction: column;
        text-align: center;
    }

    .university-logo {
        width: 60px;
        height: 60px;
    }

    .student-quotes {
        grid-template-columns: 1fr;
    }

    .quote-card {
        padding: 25px;
    }

    /* News Page Mobile */
    .news-grid {
        grid-template-columns: 1fr;
    }

    .news-search-form {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 28px;
    }

    .quick-links-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }

    .stat-number {
        font-size: 28px;
    }

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

    .news-title a {
        font-size: 18px;
    }

    .pagination {
        flex-wrap: wrap;
    }

    /* PDF Viewer Extra Small Mobile */
    .pdf-container {
        height: 400px;
        padding: 10px;
    }

    #pdf-canvas {
        max-width: calc(100% - 20px);
        max-height: calc(100% - 20px);
    }

    .pdf-viewer-header {
        padding: 10px;
    }

    .pdf-btn {
        padding: 8px 10px;
        font-size: 12px;
        min-width: 40px;
    }

    #pageInfo {
        font-size: 11px;
    }

    .cv-details h3 {
        font-size: 20px;
    }

    .cv-details p {
        font-size: 12px;
    }

    .cv-info i {
        font-size: 36px;
    }
}

@media (max-width: 360px) {
    /* Ultra Small Mobile (360px) */
    .pdf-container {
        height: 350px;
        padding: 5px;
    }

    #pdf-canvas {
        max-width: calc(100% - 10px);
        max-height: calc(100% - 10px);
    }

    .pdf-viewer-header {
        padding: 8px;
    }

    .pdf-viewer-header h2 {
        font-size: 16px;
    }

    .pdf-controls {
        gap: 5px;
    }

    .pdf-btn {
        padding: 6px 8px;
        font-size: 11px;
        min-width: 36px;
    }

    .pdf-btn i {
        font-size: 10px;
    }

    #pageInfo {
        font-size: 10px;
        padding: 0 5px;
    }

    .cv-download-section {
        padding: 20px;
        margin-bottom: 20px;
    }

    .download-btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .cv-details h3 {
        font-size: 18px;
    }

    .cv-info i {
        font-size: 32px;
    }

    .quick-link-card {
        padding: 20px;
    }

    .quick-link-card i {
        font-size: 28px;
    }

    .quick-link-card span {
        font-size: 14px;
    }
}

/* About Me Section Styles */
.about-intro-section {
    padding: 40px 0;
}

.about-profile-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
}

@media (min-width: 768px) {
    .about-profile-box {
        flex-direction: row;
        align-items: flex-start;
    }
}

.about-profile-img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 8px; /* 사각형 모서리를 둥글게 */
    border: 3px solid var(--primary-color);
    flex-shrink: 0;
}

.about-text-content {
    flex-grow: 1;
}

.about-text-content h2 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 24px;
}

.about-text-content p {
    line-height: 1.8;
    margin-bottom: 15px;
}

/* Key Interests Section Styles */
.key-interests-section {
    padding: 40px 0;
}

.key-interests-section h2 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 25px;
    text-align: center;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.interest-card {
    background-color: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--card-shadow);
}

.interest-card:hover {
    transform: translateY(-5px); /* 호버 시 살짝 위로 올라가는 효과 */
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.interest-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: all 0.3s;
}

.interest-card:hover i {
    transform: scale(1.1);
}

.interest-card h3 {
    margin: 0 0 10px 0;
    font-size: 20px;
    color: var(--text-color);
}

.interest-card p {
    font-size: 15px;
    color: #666;
    line-height: 1.6;
}

/* Mobile responsive adjustments */
@media (max-width: 767px) {
    .about-profile-box {
        padding: 20px;
        flex-direction: column;
    }

    .about-profile-img {
        width: 150px;
        height: 150px;
    }

    .about-text-content h2 {
        text-align: center;
    }

    .key-interests-section h2 {
        font-size: 24px;
    }
}