/* ========================================
   Style: Editorial / Magazine
   Design Philosophy: Academic authority,
   like Nature/Science journal typography
   ======================================== */

.exp-list {
    display: flex;
    flex-direction: column;
}

:root {
    /* Light Theme - Classic Print */
    --bg-primary: #fdfcfa;
    --bg-secondary: #f7f5f0;
    --bg-tertiary: #edeae3;
    --bg-card: #ffffff;

    --text-primary: #1a1a1a;
    --text-secondary: #3d3d3d;
    --text-muted: #6b6b6b;

    --accent-primary: #1e3a5f;
    --accent-secondary: #2c5282;
    --accent-tertiary: #c9a227;
    --accent-gradient: linear-gradient(135deg, #1e3a5f 0%, #c9a227 100%);

    --border-color: #d4d0c8;
    --border-hover: #b8b4ac;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);

    /* Typography - Serif for Authority */
    --font-display: 'Playfair Display', 'Georgia', serif;
    --font-body: 'Source Serif 4', 'Georgia', serif;
    --font-mono: 'IBM Plex Mono', monospace;
    --font-sans: 'Source Sans 3', sans-serif;

    /* Generous Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    --transition-fast: 200ms ease;
    --transition-base: 300ms ease;

    --radius-sm: 0;
    --radius-md: 2px;
    --radius-lg: 4px;
    --radius-xl: 6px;
}
/* ---- Global Resets ---- */
* { -webkit-tap-highlight-color: transparent; }
[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }
::selection { background: var(--accent-primary); color: #fff; }


/* Dark Theme - Evening Reading */
[data-theme="dark"] {
    --bg-primary: #1c1b19;
    --bg-secondary: #252420;
    --bg-tertiary: #2e2d28;
    --bg-card: #232220;

    --text-primary: #f0ede6;
    --text-secondary: #c4c0b8;
    --text-muted: #8a8680;

    --border-color: #3a3835;
    --border-hover: #4a4845;

    --accent-primary: #5b8dd6;
    --accent-secondary: #7ba3e0;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 17px;
    transition: background-color var(--transition-base), color var(--transition-base);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    text-decoration: underline;
}

/* ========================================
   Navigation - Classic Top Bar
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-logo:hover {
    text-decoration: none;
}

.logo-bracket {
    color: var(--accent-primary);
}

.logo-text {
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-links a:hover {
    color: var(--accent-primary);
    text-decoration: none;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 2px;
    border: 1px solid var(--border-color);
    padding: 2px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-btn:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.nav-btn-icon {
    width: 14px;
    height: 14px;
}

.nav-btn-label {
    white-space: nowrap;
}

.nav-divider {
    width: 1px;
    height: 18px;
    background: var(--border-color);
    margin: 0 2px;
}

.sun-icon { display: block; }
.moon-icon { display: none; }

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

[data-theme="dark"] .theme-label::after { content: "Light"; }
[data-theme="light"] .theme-label::after { content: "Dark"; }

.theme-label {
    font-size: 0;
}

.theme-label::after {
    font-size: 0.75rem;
}

/* ========================================
   Hero - Magazine Cover Layout
   ======================================== */

.hero {
    min-height: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 100px var(--space-xl) var(--space-lg);
    position: relative;
}

.hero-bg {
    display: none;
}

.hero-content {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-3xl);
    align-items: center;
    width: 100%;
}

.hero-greeting {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-md);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.hero-title {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    font-style: italic;
    border-left: 3px solid var(--accent-primary);
    padding-left: var(--space-md);
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.hero-description p {
    margin-bottom: 0.5em;
}

.hero-description p:last-child {
    margin-bottom: 0;
}

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: block;
}

.stat-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
}

.btn {
    font-family: var(--font-sans);
    padding: var(--space-md) var(--space-xl);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    border: none;
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-primary);
}

.btn-secondary:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.hero-image {
    display: flex;
    justify-content: center;
    order: -1;
}

.image-frame {
    width: 240px;
    height: 300px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    padding: 0;
    background: var(--bg-secondary);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder svg {
    width: 60px;
    height: 60px;
    color: var(--text-muted);
    opacity: 0.5;
}

/* ========================================
   Sections Base
   ======================================== */

.section {
    padding: 48px var(--space-xl);
}

.section-alt {
    background: var(--bg-secondary);
}

.section-container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.title-icon {
    display: inline-block;
    width: 6px;
    height: 1.3em;
    background: var(--accent-gradient);
    border-radius: 2px;
    font-size: 0;
}

/* ========================================
   Publications - Journal Style
   ======================================== */

.publications-filter {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.filter-btn {
    font-family: var(--font-sans);
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.filter-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.pub-card {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.pub-card:last-child {
    border-bottom: none;
}

.pub-year {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-xs);
}

.pub-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
    min-width: 0;
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.pub-venue {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

.pub-links {
    display: flex;
    gap: var(--space-sm);
    flex-shrink: 0;
    white-space: nowrap;
}

.pub-link {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    padding: 2px var(--space-sm);
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
}

.pub-link:hover {
    background: var(--accent-primary);
    color: white;
    text-decoration: none;
}

/* ========================================
   Projects - Column Layout
   ======================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.project-card {
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: border-color var(--transition-fast);
    cursor: pointer;
}

.project-card:hover {
    border-color: var(--accent-primary);
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 2px var(--space-sm);
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.project-links {
    display: flex;
    gap: var(--space-lg);
}

.project-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-link:hover {
    text-decoration: underline;
}

.project-link svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   News - Timeline
   ======================================== */

#news .news-list {
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    padding: var(--space-sm) var(--space-lg);
}

.news-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.news-item {
    position: relative;
    text-align: center;
    padding: var(--space-md) 140px;
    border-bottom: 1px solid var(--border-color);
}

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

.news-date {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.news-content {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.news-badge {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.6rem;
    padding: 2px 8px;
    background: var(--accent-primary);
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    flex-shrink: 0;
    min-width: 50px;
    text-align: center;
}

.news-badge[data-type="award"] {
    background: #c9a227;
}

.news-text {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

.news-text {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
    flex-basis: 100%;
}

.news-link {
    color: inherit;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: var(--border-color);
}

.news-link:hover {
    color: var(--accent-primary);
    text-decoration-color: var(--accent-primary);
}

.news-people {
    flex-basis: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: 4px;
    font-size: 0.75rem;
}

.news-people-link {
    color: var(--text-muted);
    text-decoration: underline;
    text-decoration-style: dotted;
}

.news-people-link:hover {
    color: var(--accent-primary);
}

/* ========================================
   Experience - Timeline Items
   ======================================== */

.experience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
}

.exp-category {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--accent-primary);
}

.exp-item {
    position: relative;
    text-align: center;
    padding: var(--space-md) 140px;
    border-bottom: 1px solid var(--border-color);
}

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

.exp-period {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.exp-title {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.exp-org {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.exp-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

.exp-link {
    color: inherit;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: var(--border-color);
}

.exp-link:hover {
    color: var(--accent-primary);
    text-decoration-color: var(--accent-primary);
}

.exp-people {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
    font-size: 0.75rem;
}

.exp-people-link {
    color: var(--text-muted);
    text-decoration: underline;
    text-decoration-style: dotted;
}

.exp-people-link:hover {
    color: var(--accent-primary);
}

/* ---- Internships / Education / Teaching: individual small cards, narrower & centered ---- */
#internships .exp-item,
#education .exp-item,
#teaching .exp-item {
    width: 700px;
    max-width: 100%;
    margin: 0 auto var(--space-lg) auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
}

#internships .exp-item:last-child,
#education .exp-item:last-child,
#teaching .exp-item:last-child {
    margin-bottom: 0;
}

/* ---- Services: one unified big card ---- */
#services .exp-list {
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    padding: var(--space-sm) var(--space-lg);
}

/* ========================================
   Contact
   ======================================== */

.contact-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.contact-content p {
    margin-bottom: 1.5em;
}

.contact-content p:last-child {
    margin-bottom: 0;
}

.contact-intro {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.contact-item:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    text-decoration: none;
}

.contact-item svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.visitor-stats {
    margin-top: var(--space-sm);
    font-size: 0.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
}

.visitor-stats svg {
    opacity: 0.7;
}

.stat-divider {
    color: var(--border-color);
}

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

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .hero-title {
        border-left: none;
        padding-left: 0;
        border-bottom: 3px solid var(--accent-primary);
        padding-bottom: var(--space-sm);
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .experience-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 100px var(--space-md) var(--space-2xl);
    }

    .hero-name {
        font-size: 2rem;
    }

    .image-frame {
        width: 180px;
        height: 220px;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
    }

    .section {
        padding: var(--space-2xl) var(--space-md);
    }

    .pub-card {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    .exp-item,
    .news-item {
        padding: var(--space-md) var(--space-sm);
    }

    .exp-period,
    .news-date {
        position: static;
        display: block;
        text-align: center;
        margin-bottom: var(--space-xs);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   Hide SPA-specific elements
   ======================================== */

.spa-layout {
    display: block;
}

.sidebar {
    display: none;
}

.content-area {
    margin-left: 0;
    padding: 0;
    min-height: auto;
}

.content-section {
    display: block !important;
}

.about-cards,
.about-news-card {
    display: none;
}

/* Scroll Down Arrow */
.scroll-arrow {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    animation: bounce 2s infinite;
}

.scroll-arrow:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateX(-50%) scale(1.1);
}

.scroll-arrow svg {
    width: 24px;
    height: 24px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========================================
   Editorial Magazine Animations
   ======================================== */

/* Elegant fade in from bottom */
@keyframes editorialFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Typewriter cursor blink */
@keyframes cursorBlink {
    0%, 50% { border-color: var(--accent-primary); }
    51%, 100% { border-color: transparent; }
}

/* Line draw from left */
@keyframes lineDrawLeft {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

/* Line draw from center */
@keyframes lineDrawCenter {
    from {
        transform: scaleX(0);
    }
    to {
        transform: scaleX(1);
    }
}

/* Elegant scale reveal */
@keyframes scaleReveal {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Slide in from left */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide in from right */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Apply animations to Hero elements */

.hero-greeting {
    animation: slideInLeft 0.6s ease-out forwards;
    animation-delay: 0.1s;
    opacity: 0;
}

.hero-name {
    animation: editorialFadeIn 0.8s ease-out forwards;
    animation-delay: 0.3s;
    opacity: 0;
}

.hero-title {
    animation: slideInLeft 0.7s ease-out forwards;
    animation-delay: 0.5s;
    opacity: 0;
}

.hero-description {
    animation: editorialFadeIn 0.7s ease-out forwards;
    animation-delay: 0.7s;
    opacity: 0;
}

.hero-stats {
    animation: scaleReveal 0.6s ease-out forwards;
    animation-delay: 0.9s;
    opacity: 0;
}

.hero-cta {
    animation: editorialFadeIn 0.6s ease-out forwards;
    animation-delay: 1.1s;
    opacity: 0;
}

.hero-image {
    animation: slideInRight 0.8s ease-out forwards;
    animation-delay: 0.4s;
    opacity: 0;
}

/* Image frame elegant border animation */
.image-frame {
    position: relative;
    transition: all 0.4s ease;
}

.image-frame::after {
    content: '';
    position: absolute;
    inset: -8px;
    border: 1px solid var(--accent-primary);
    opacity: 0;
    transition: all 0.4s ease;
}

.image-frame:hover::after {
    opacity: 1;
    inset: -12px;
}

/* Section title underline animation */
.section-title {
    position: relative;
    overflow: hidden;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width 0.6s ease;
}

.section:hover .section-title::after {
    width: 120px;
}

/* Publication card hover effects */
.pub-card {
    transition: all 0.3s ease;
    position: relative;
}

.pub-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: var(--accent-primary);
    transition: width 0.3s ease;
}

.pub-card:hover {
    padding-left: calc(var(--space-lg) + 4px);
}

.pub-card:hover::before {
    width: 3px;
}

/* Project card hover */
.project-card {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

/* News item hover */
.news-item {
    transition: all 0.3s ease;
}

.news-item:hover {
    background: var(--bg-secondary);
}

/* Button elegant hover */
.btn-primary {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 58, 95, 0.3);
}

/* Contact item hover */
.contact-item {
    transition: all 0.3s ease;
    position: relative;
}

.contact-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Tag hover effect */
.tag {
    transition: all 0.2s ease;
}

.tag:hover {
    background: var(--accent-primary);
    color: white;
}

/* Publication link hover */
.pub-link {
    transition: all 0.2s ease;
}

.pub-link:hover {
    transform: scale(1.05);
}

/* Experience item hover */
.exp-item {
    transition: all 0.3s ease;
}

.exp-item:hover {
    background: var(--bg-secondary);
}

/* ========================================
   Scroll-Triggered Animations
   ======================================== */

.scroll-animate {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.section.scroll-animate {
    transform: translateY(30px);
}

.section.scroll-animate.visible {
    transform: translateY(0);
}

.pub-card.scroll-animate {
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.pub-card.scroll-animate.visible {
    opacity: 1;
    transform: translateX(0);
}

.project-card.scroll-animate {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.project-card.scroll-animate.visible {
    opacity: 1;
    transform: scale(1);
}

.news-item.scroll-animate {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.news-item.scroll-animate.visible {
    opacity: 1;
    transform: translateX(0);
}

.exp-item.scroll-animate {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.exp-item.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-item.scroll-animate {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.contact-item.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title.scroll-animate {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.section-title.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.filter-btn.scroll-animate {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.filter-btn.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Navbar Scroll Effect
   ======================================== */

.navbar.scrolled {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.navbar.scrolled .nav-container {
    padding: var(--space-sm) var(--space-xl);
}

.navbar.scrolled .nav-logo {
    font-size: 1.1rem;
}

/* ========================================
   Theme Transition Animation
   ======================================== */

.theme-transitioning,
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
    transition: background-color 0.5s ease,
                color 0.5s ease,
                border-color 0.5s ease,
                box-shadow 0.5s ease !important;
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ---- Focus Styles ---- */
:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: 3px; border-radius: 2px; }

/* ---- Skip Link ---- */
.skip-link { position: absolute; top: -40px; left: 0; background: var(--accent-primary); color: #fff; padding: 8px 16px; z-index: 9999; font-size: 0.875rem; transition: top 0.2s; }
.skip-link:focus { top: 0; }