/* CSS Variables for Light/Dark Mode */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --sidebar-bg: #f8f9fa;
    --border-color: #e9ecef;
    --icon-color: #6c757d;
    --hover-color: #f1f3f4;
    --shadow: rgba(0, 0, 0, 0.1);
    --accent-color: #007bff;
    --accent-hover: #0056b3;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e9ecef;
    --sidebar-bg: #2d2d2d;
    --border-color: #404040;
    --icon-color: #adb5bd;
    --hover-color: #3a3a3a;
    --shadow: rgba(0, 0, 0, 0.3);
    --accent-color: #4dabf7;
    --accent-hover: #339af0;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.header {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    background: var(--bg-color);
    transition: background-color 0.3s ease;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 16px;
    border-radius: 6px;
}

.nav-link:hover {
    color: var(--accent-color);
    background: var(--hover-color);
}

/* Theme Toggle Button - now in navbar */
.theme-toggle {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow);
}

.theme-toggle:hover {
    background: var(--hover-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow);
}

.theme-toggle i {
    color: var(--icon-color);
    font-size: 16px;
    transition: all 0.3s ease;
}

/* Main Content Layout - Updated for three columns */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
    display: grid;
    grid-template-columns: 300px 1fr 300px;
    gap: 40px;
    min-height: calc(100vh - 100px);
    align-items: start;
}

/* Left Sidebar */
.sidebar {
    background: var(--sidebar-bg);
    padding: 35px;
    border-radius: 12px;
    height: fit-content;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border-color);
}

.profile-section {
    text-align: left;
}

/* .profile-image {
    width: 130px;
    height: 130px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.2);
}

.profile-image i {
    font-size: 50px;
    color: white;
} */

.profile-image {
    width: 130px;
    height: 130px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    overflow: hidden;
    /* ensures round crop */
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.2);
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* fills nicely */
    display: block;
}

.profile-name {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-color);
}

.profile-title {
    color: var(--icon-color);
    margin-bottom: 25px;
    font-size: 16px;
    font-weight: 500;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 6px 8px;
    border-radius: 6px;
    cursor: pointer;
}

.contact-item:hover {
    color: var(--accent-color);
    background: var(--hover-color);
    padding-left: 8px;
    text-decoration: none;
}

.contact-item i {
    width: 18px;
    color: var(--accent-color);
    transition: all 0.3s ease;
    text-decoration: none;
}

.contact-item:visited {
    color: var(--text-color);
}

.contact-item:active {
    color: var(--accent-color);
}

/* Main Content - Centered */
.content {
    padding: 0 20px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 35px;
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 2px;
}

.content-text {
    font-size: 17px;
    line-height: 1.8;
}

.content-text p {
    margin-bottom: 22px;
    color: var(--text-color);
}

.content-text strong {
    font-weight: 600;
    color: var(--accent-color);
}

/* Right Sidebar - News Section */
.news-sidebar {
    background: var(--sidebar-bg);
    padding: 35px;
    border-radius: 12px;
    height: fit-content;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border-color);
}

.news-section {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.news-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-color);
    position: relative;
}

.news-title::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 30px;
    height: 2px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 1px;
}

.news-container {
    margin-bottom: 20px;
}

.news-item {
    margin-bottom: 15px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.news-item:last-child {
    border-bottom: none;
}

.news-item:hover {
    background: var(--hover-color);
    padding-left: 8px;
    border-radius: 6px;
}

.news-date {
    font-size: 13px;
    color: var(--icon-color);
    font-weight: 500;
    margin-bottom: 6px;
}

.news-content {
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-color);
}

.news-content a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-content a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* News Pagination */
.news-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
}

.pagination-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    min-width: 32px;
    text-align: center;
    font-weight: 500;
}

.pagination-btn:hover {
    background: var(--hover-color);
    color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--shadow);
}

.pagination-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.3);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.pagination-btn:disabled:hover {
    background: var(--bg-color);
    color: var(--text-color);
    transform: none;
    box-shadow: none;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 280px 1fr 280px;
        gap: 30px;
    }

    .sidebar,
    .news-sidebar {
        padding: 25px;
    }
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .sidebar {
        order: 1;
    }

    .content {
        order: 2;
        padding: 0;
    }

    .news-sidebar {
        order: 3;
    }

    .header-content {
        flex-direction: column;
        gap: 20px;
    }

    .nav {
        gap: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .theme-toggle {
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 20px 15px;
    }

    .sidebar,
    .news-sidebar {
        padding: 20px;
    }

    .profile-image {
        width: 110px;
        height: 110px;
    }

    .profile-image i {
        font-size: 45px;
    }

    .section-title {
        font-size: 30px;
    }

    .nav {
        gap: 15px;
    }

    .news-pagination {
        gap: 6px;
    }

    .pagination-btn {
        padding: 5px 8px;
        font-size: 12px;
        min-width: 28px;
    }
}

@media (max-width: 480px) {
    .news-pagination {
        flex-wrap: wrap;
        gap: 4px;
    }

    .pagination-btn {
        padding: 4px 6px;
        font-size: 11px;
        min-width: 24px;
    }
}

/* Research Page Specific Styles */
.research-main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: calc(100vh - 100px);
}

.research-section {
    margin-bottom: 60px;
}

.research-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 40px;
    color: var(--text-color);
    position: relative;
}

.research-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 2px;
}

.research-subtitle {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-color);
}

.research-content {
    font-size: 17px;
    line-height: 1.8;
}

.research-content p {
    margin-bottom: 20px;
    color: var(--text-color);
}

.research-content strong {
    font-weight: 700;
    color: var(--accent-color);
}

/* External Links */
.external-link {
    color: var(--accent-color);
    text-decoration: underline;
    transition: all 0.3s ease;
    display: inline-block;
    margin-right: 5px;
}

.external-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

.external-link i {
    font-size: 12px;
    margin-left: 3px;
}

/* Publications Section */
.publications-section {
    margin-top: 50px;
}

.publications-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-color);
    position: relative;
}

.publications-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 2px;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.publication-item {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow);
}

.publication-content {
    flex: 1;
}

.publication-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
    line-height: 1.4;
}

.publication-venue {
    font-size: 14px;
    color: var(--icon-color);
    font-weight: 500;
}

.publication-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

.action-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--hover-color);
    color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--shadow);
}

/* Dropdown Styles */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-btn {
    display: flex;
    align-items: center;
    gap: 6px;
}

.dropdown-content {
    display: none;
    position: absolute;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 1000;
    min-width: 120px;
    top: 100%;
    right: 0;
    margin-top: 5px;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 10px 16px;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
    font-size: 13px;
}

.dropdown-content a:hover {
    background: var(--hover-color);
    color: var(--accent-color);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Active Navigation Link */
.nav-link.active {
    color: var(--accent-color);
    background: var(--hover-color);
}

/* Responsive Design for Research Page */
@media (max-width: 768px) {
    .research-main {
        padding: 20px 15px;
    }

    .research-title {
        font-size: 30px;
    }

    .research-subtitle {
        font-size: 20px;
    }

    .publication-item {
        flex-direction: column;
        gap: 15px;
    }

    .publication-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .publication-title {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .publication-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .action-btn {
        justify-content: center;
    }
}

/* Research Page Specific Styles */
.research-main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: calc(100vh - 100px);
}

.research-section {
    margin-bottom: 60px;
}

.research-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--text-color);
    position: relative;
}

.research-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 2px;
}

.research-subtitle {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-color);
}

.research-content {
    font-size: 17px;
    line-height: 1.8;
}

.research-content p {
    margin-bottom: 20px;
    color: var(--text-color);
}

.research-content strong {
    font-weight: 700;
    color: var(--accent-color);
}

/* External Links */
.external-link {
    color: var(--accent-color);
    text-decoration: underline;
    transition: all 0.3s ease;
    display: inline-block;
    margin-right: 5px;
}

.external-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

.external-link i {
    font-size: 12px;
    margin-left: 3px;
}

/* Publications Section */
.publications-section {
    margin-bottom: 60px;
}

.publications-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-color);
    position: relative;
}

.publications-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 2px;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.publication-item {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow);
}

.publication-content {
    flex: 1;
}

.publication-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
    line-height: 1.4;
}

.publication-venue {
    font-size: 14px;
    color: var(--icon-color);
    font-weight: 500;
}

.publication-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

/* Patents Section */
.patents-section {
    margin-bottom: 40px;
}

.patents-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.patent-item {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.patent-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow);
}

.patent-content {
    flex: 1;
}

.patent-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
    line-height: 1.4;
}

.patent-status {
    font-size: 14px;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.patent-description {
    font-size: 14px;
    color: var(--icon-color);
    line-height: 1.5;
}

.patent-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

/* Action Buttons */
.action-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--hover-color);
    color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--shadow);
}

/* Dropdown Styles */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-btn {
    display: flex;
    align-items: center;
    gap: 6px;
}

.dropdown-content {
    display: none;
    position: absolute;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 1000;
    min-width: 120px;
    top: 100%;
    right: 0;
    margin-top: 5px;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 10px 16px;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
    font-size: 13px;
}

.dropdown-content a:hover {
    background: var(--hover-color);
    color: var(--accent-color);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Active Navigation Link */
.nav-link.active {
    color: var(--accent-color);
    background: var(--hover-color);
}

/* Responsive Design for Research Page */
@media (max-width: 768px) {
    .research-main {
        padding: 20px 15px;
    }
    
    .research-title {
        font-size: 30px;
    }
    
    .research-subtitle {
        font-size: 20px;
    }
    
    .publication-item,
    .patent-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .publication-actions,
    .patent-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .publication-title,
    .patent-title {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .publication-actions,
    .patent-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .action-btn {
        justify-content: center;
    }
}

/* Patents Section */
.patents-section {
    margin-bottom: 40px;
}

.patents-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.patent-item {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
}

.patent-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow);
}

.patent-content {
    width: 100%;
}

.patent-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-color);
    line-height: 1.4;
}

.patent-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.patent-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.patent-info:last-child {
    border-bottom: none;
}

.patent-label {
    font-size: 14px;
    color: var(--icon-color);
    font-weight: 500;
}

.patent-value {
    font-size: 14px;
    color: var(--text-color);
    font-weight: 600;
}

/* Responsive Design for Patents */
@media (max-width: 768px) {
    .patent-item {
        padding: 20px;
    }

    .patent-title {
        font-size: 16px;
    }

    .patent-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}