/* CSS Variables for theming */
:root {
    --bg-primary: #fff;
    --bg-secondary: #f8f9fa;
    --bg-card: #fff;
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #6b7280;
    --border-color: #ddd;
    --border-light: #e9ecef;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --shadow-sm: rgba(0, 0, 0, 0.1);
    --shadow-md: rgba(0, 0, 0, 0.15);
    --code-bg: #f8f9fa;
}

[data-theme="dark"] .pf-card-cat {
    background: rgba(59, 130, 246, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #1f2937;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-color: #374151;
    --border-light: #374151;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --shadow-sm: rgba(0, 0, 0, 0.3);
    --shadow-md: rgba(0, 0, 0, 0.4);
    --code-bg: #374151;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background: var(--bg-primary);
    box-shadow: 0 2px 4px var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.logo img.nav-profile-photo {
    width: 32px !important;
    height: 32px !important;
    max-width: 32px !important;
    max-height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    border-radius: 50%;
    object-fit: cover;
    border: none;
    display: block;
}

.logo img.nav-profile-photo:hover {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

main {
    margin: 2rem auto;
    min-height: calc(100vh - 200px);
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

footer {
    background: var(--bg-secondary);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    transition: background-color 0.3s;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.world-map-container {
    margin-top: 2rem;
    width: 100%;
}

#world-map-canvas {
    display: block;
    width: 100%;
    border-radius: 8px;
    opacity: 0.9;
}

.hero-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-photo {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 4px var(--border-light), 0 4px 20px var(--shadow-md);
    margin-bottom: 1.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.profile-photo:hover {
    transform: scale(1.03);
    box-shadow: 0 0 0 4px var(--border-light), 0 8px 30px var(--shadow-md);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.25s ease;
    border: 2px solid var(--border-light);
}

.social-link:hover {
    transform: translateY(-3px);
    text-decoration: none;
}

/* LinkedIn */
.social-link.linkedin:hover {
    background: #0077b5;
    color: #fff;
    border-color: #0077b5;
    box-shadow: 0 4px 12px rgba(0, 119, 181, 0.4);
}

/* GitHub */
.social-link.github:hover {
    background: #333;
    color: #fff;
    border-color: #333;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Email */
.social-link.email:hover {
    background: #ea4335;
    color: #fff;
    border-color: #ea4335;
    box-shadow: 0 4px 12px rgba(234, 67, 53, 0.4);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.quick-links {
    margin: 4rem 0;
}

.quick-links h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.link-card {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    background: var(--bg-card);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.link-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow-sm);
}

.link-card h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.link-card p {
    color: var(--text-secondary);
}

.recent-posts {
    margin: 4rem 0;
}

.recent-posts h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.posts-preview {
    display: grid;
    gap: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.3s;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn-primary {
    background: var(--accent-color);
}

.cv {
    max-width: 900px;
}

.cv-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--accent-color);
}

.cv-section {
    margin-bottom: 3rem;
}

.cv-section h2 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.cv-item {
    margin-bottom: 2rem;
}

.cv-item h3 {
    margin-bottom: 0.25rem;
}

.cv-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.cv-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    list-style: none;
}

.cv-skills li {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 4px;
    transition: background-color 0.3s;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.portfolio-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-card);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.portfolio-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow-sm);
}

.portfolio-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.portfolio-content {
    padding: 1.5rem;
}

.portfolio-content h2 {
    margin-bottom: 0.5rem;
}

.portfolio-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 1rem;
}

/* ── About page redesign ── */

.about-hero {
    text-align: center;
    padding: 3rem 0 2rem;
}

.about-portrait {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 4px var(--border-light), 0 4px 20px var(--shadow-md);
    margin-bottom: 1.25rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.about-hero h1 {
    font-size: 2rem;
    margin-bottom: 0.4rem;
}

.about-tagline {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.about-body {
    max-width: 740px;
    margin: 0 auto;
    padding-bottom: 3rem;
}

.about-section {
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-light);
}

.about-section-last {
    border-bottom: none;
}

.about-section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.about-section-icon {
    font-size: 1.1rem;
}

.about-section p {
    color: var(--text-secondary);
    margin-bottom: 0.9rem;
    line-height: 1.75;
}

.about-section p:last-child {
    margin-bottom: 0;
}

.about-section a {
    color: var(--accent-color);
    text-decoration: none;
}

.about-section a:hover {
    text-decoration: underline;
}

.about-list {
    list-style: none;
    margin: 0.75rem 0 1rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.about-list li {
    padding: 0.65rem 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
    color: var(--text-secondary);
    line-height: 1.5;
    transition: background-color 0.3s;
}

.about-interest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.about-interest-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s;
}

.about-interest-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow-sm);
}

.interest-icon {
    font-size: 1.6rem;
}

.about-contact-btn {
    display: inline-block;
    margin-top: 1.25rem;
    padding: 0.7rem 1.75rem;
    border-radius: 6px;
}

/* ── Portfolio redesign ── */

.pf-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.pf-filter-btn {
    padding: 0.4rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.2s;
}

.pf-filter-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.pf-filter-btn.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

.pf-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.pf-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s;
    outline: none;
}

.pf-card:hover,
.pf-card:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px var(--shadow-sm);
    border-color: var(--accent-color);
}

.pf-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.75rem 1rem 1rem;
    color: var(--accent-color);
    opacity: 0.8;
}

.pf-card-icon svg {
    width: 48px;
    height: 48px;
}

.pf-card-body {
    flex: 1;
    padding: 0 1.25rem 0.75rem;
}

.pf-card-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.5rem;
}

.pf-card-cat {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--accent-color);
    background: rgba(0, 123, 255, 0.12);
    padding: 0.15rem 0.55rem;
    border-radius: 20px;
}

.pf-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.pf-card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.pf-card-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pf-card-footer {
    padding: 0.75rem 1.25rem 1rem;
    border-top: 1px solid var(--border-light);
    margin-top: 0.5rem;
}

.pf-card-cta {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-color);
}

.portfolio-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    padding: 3rem 0;
}

/* PDF Modal */
.pdf-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.65);
    display: flex;
    align-items: stretch;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
}

.pdf-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.pdf-modal-inner {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 960px;
    margin: 1.5rem;
    background: var(--bg-card);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    transform: translateY(12px);
    transition: transform 0.25s;
}

.pdf-modal.open .pdf-modal-inner {
    transform: translateY(0);
}

.pdf-modal-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-light);
    gap: 1rem;
    flex-shrink: 0;
}

.pdf-modal-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pdf-modal-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
}

.pdf-modal-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.82rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
}

.pdf-modal-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.pdf-modal-close {
    padding: 0.4rem;
}

.pdf-modal-frame {
    flex: 1;
    border: none;
    width: 100%;
    min-height: 0;
    height: calc(100vh - 8rem);
}

@media (max-width: 600px) {
    .pdf-modal-inner {
        margin: 0;
        border-radius: 0;
    }
    .pdf-modal-btn span {
        display: none;
    }
}

/* ── CV redesign (cv2) ── */

.cv2 {
    max-width: 860px;
    padding-bottom: 4rem;
}

.cv2-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    padding: 2.5rem 0 2rem;
    border-bottom: 2px solid var(--accent-color);
    margin-bottom: 2.5rem;
}

.cv2-header h1 {
    font-size: 2rem;
    margin-bottom: 0.3rem;
}

.cv2-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.cv2-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1.5rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.cv2-contact span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.cv2-contact svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.cv2-download {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
    flex-shrink: 0;
    border-radius: 6px;
    padding: 0.6rem 1.25rem;
    font-size: 0.9rem;
}

.cv2-section {
    margin-bottom: 2.75rem;
}

.cv2-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

/* Timeline */
.cv2-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding-left: 1.25rem;
    border-left: 2px solid var(--border-light);
}

.cv2-entry {
    position: relative;
    padding: 0 0 1.75rem 1.5rem;
}

.cv2-entry:last-child {
    padding-bottom: 0;
}

.cv2-entry-dot {
    position: absolute;
    left: -0.55rem;
    top: 0.35rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 2px solid var(--bg-primary);
    flex-shrink: 0;
}

.cv2-entry-body {
    flex: 1;
}

.cv2-entry-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.35rem;
}

.cv2-entry-header h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.1rem;
}

.cv2-org {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.cv2-date {
    font-size: 0.82rem;
    color: var(--text-muted);
    white-space: nowrap;
    padding-top: 0.1rem;
}

.cv2-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-top: 0.4rem;
}

/* Skills grid */
.cv2-skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}

.cv2-skill-group {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.25rem;
    transition: background-color 0.3s;
}

.cv2-skill-group h3 {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
}

.cv2-skill-group ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.cv2-skill-group li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 0.75rem;
    position: relative;
}

.cv2-skill-group li::before {
    content: "–";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Publications */
.cv2-pub {
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--accent-color);
    background: var(--bg-secondary);
    border-radius: 0 6px 6px 0;
    transition: background-color 0.3s;
}

.cv2-pub-title a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.55;
}

.cv2-pub-title a:hover {
    color: var(--accent-color);
}

.cv2-pub-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

@media (max-width: 600px) {
    .cv2-header {
        flex-direction: column;
    }
    .cv2-download {
        align-self: flex-start;
    }
    .cv2-entry-header {
        flex-direction: column;
        gap: 0.15rem;
    }
}

/* ── GitHub Repos section ── */

.gh-section {
    margin-bottom: 4rem;
}

.gh-section-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.gh-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.gh-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 10px;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background-color 0.3s;
    gap: 0.75rem;
}

.gh-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px var(--shadow-sm);
    border-color: var(--accent-color);
}

.gh-card-body {
    flex: 1;
}

.gh-card-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.4rem;
    word-break: break-word;
}

.gh-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gh-card-footer {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--border-light);
    padding-top: 0.75rem;
}

.gh-lang {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.gh-lang-dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    flex-shrink: 0;
}


/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 2px solid var(--border-light);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.25s ease;
    margin-left: 1rem;
}

.theme-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

.nav-right {
    display: flex;
    align-items: center;
}