/* ── Reset & Base ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --accent: #4a6fa5;
    --accent-light: #6b8fc0;
    --accent-bg: #e8f0fc;
    --bg: #fafcff;
    --bg-card: rgba(255, 255, 255, 0.35);
    --text: #1a1f2e;
    --text-secondary: #3d4a5c;
    --text-tertiary: #7a8899;
    --border: #b0c8e8;
    --gold: #4a6fa5;
    --sand: #dce8f5;
    --sage: #b8d0ed;
    --shadow-sm: 0 1px 2px rgba(26,31,46,0.06);
    --shadow-md: 0 4px 16px rgba(26,31,46,0.08), 0 1px 3px rgba(26,31,46,0.04);
    --shadow-lg: 0 12px 32px rgba(26,31,46,0.1), 0 4px 8px rgba(26,31,46,0.04);
    --radius: 12px;
    --nav-height: 64px;
    --max-w: 960px;
    --nav-bg: rgba(250, 252, 255, 0.8);
    --nav-bg-scroll: rgba(250, 252, 255, 0.95);
    --mesh: rgba(74, 111, 165, 0.02);
}

[data-theme="dark"] {
    --accent: #6b8fc0;
    --accent-light: #8dadd6;
    --accent-bg: rgba(74, 111, 165, 0.12);
    --bg: #0c0f14;
    --bg-card: #141820;
    --text: #dce4f0;
    --text-secondary: #94a3b8;
    --text-tertiary: #5c6b80;
    --border: #1e2a3a;
    --gold: #6b8fc0;
    --sand: #1a2535;
    --sage: #1e2a3a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.35), 0 1px 3px rgba(0,0,0,0.25);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.45), 0 4px 8px rgba(0,0,0,0.25);
    --nav-bg: rgba(14, 14, 12, 0.8);
    --nav-bg-scroll: rgba(14, 14, 12, 0.95);
    --mesh: rgba(107, 143, 192, 0.06);
}

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 40px + 24px); }

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg);
    background-image:
        linear-gradient(to right, var(--mesh) 1px, transparent 1px),
        linear-gradient(to bottom, var(--mesh) 1px, transparent 1px);
    background-size: 48px 48px;
    color: var(--text);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background 0.4s, color 0.4s;
}

::selection { background: var(--accent); color: #fff; }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-light); }



/* ── Animations ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}
.animate-on-scroll.visible.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.visible.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.visible.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.visible.delay-4 { transition-delay: 0.4s; }

/* ── Navbar ── */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    transition: box-shadow 0.3s;
}
nav.scrolled {
    box-shadow: 0 1px 12px rgba(0,0,0,0.06);
}

/* Primary bar */
.nav-primary {
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-brand {
    font-weight: 700;
    font-size: 16px;
    color: var(--text);
    letter-spacing: -0.02em;
}
.nav-pages { display: flex; gap: 4px; }
.nav-pages a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
}
.nav-pages a:hover, .nav-pages a.active {
    color: var(--text);
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Sub bar */
.nav-sub {
    height: 40px;
    background: var(--nav-bg-scroll);
    border-bottom: 1px solid var(--border);
}
.nav-sub .nav-inner { height: 40px; justify-content: center; }
.nav-sections { display: flex; gap: 4px; }
.nav-sections a {
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}
.nav-sections a:hover, .nav-sections a.active {
    color: var(--accent);
    background: var(--accent-bg);
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text);
}
.nav-mobile-toggle svg { display: block; }

/* ── Layout ── */
main { padding-top: calc(var(--nav-height) + 40px); }
.section {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 48px 24px;
}
.section-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 12px;
}
.section-title {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 28px;
    line-height: 1.2;
}
.divider {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}
.divider hr {
    border: none;
    height: 1px;
    background: var(--border);
}

/* ── News ── */
.news-list {
    display: flex;
    flex-direction: column;
    max-height: 200px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
    padding: 0 12px 0 0;
    position: relative;
}
.news-list::-webkit-scrollbar { width: 3px; }
.news-list::-webkit-scrollbar-track { background: transparent; }
.news-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.news-list::after {
    content: '';
    position: sticky;
    bottom: 0;
    left: 0;
    right: 0;
    height: 48px;
    background: linear-gradient(transparent, var(--bg));
    pointer-events: none;
    display: block;
}
.news-item {
    display: flex;
    gap: 20px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}
.news-item:last-child { border-bottom: none; }
.news-date {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    white-space: nowrap;
    min-width: 90px;
    font-variant-numeric: tabular-nums;
}
.news-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.news-text strong { color: var(--text); font-weight: 600; }
.news-icon {
    width: 18px;
    height: 18px;
    object-fit: contain;
    vertical-align: -3px;
    margin-right: 2px;
}

/* ── Hero ── */
.hero {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 80px 24px 48px;
    display: flex;
    align-items: center;
    gap: 48px;
}
.hero-photo-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}
.hero-address {
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 1.6;
    text-align: center;
    letter-spacing: 0.01em;
}
.hero-text { flex: 1; min-width: 0; }
.hero-photo {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}
.hero-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    filter: grayscale(20%);
    transition: filter 0.4s;
}
.hero-photo:hover img {
    filter: grayscale(0%);
}
.hero h1 {
    font-size: clamp(40px, 7vw, 60px);
    font-weight: 400;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--text);
}
.hero h1 .hero-first-name {
    font-weight: 800;
    color: var(--accent);
}
.hero h1 .hero-word {
    display: inline-block;
    opacity: 0;
    filter: blur(8px);
    transform: translateY(30px) scale(0.95);
    animation: heroWordIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.hero h1 .hero-word:nth-child(1) { animation-delay: 0.2s; }
.hero h1 .hero-word:nth-child(2) { animation-delay: 0.4s; }
.hero h1 .hero-word:nth-child(3) { animation-delay: 0.6s; }
@keyframes heroWordIn {
    0% { opacity: 0; filter: blur(8px); transform: translateY(30px) scale(0.95); }
    60% { opacity: 1; filter: blur(0); transform: translateY(-4px) scale(1.02); }
    100% { opacity: 1; filter: blur(0); transform: translateY(0) scale(1); }
}

/* Stagger the bio and links too */
.hero-bio {
    animation: heroFadeIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.8s both;
}
.hero-links {
    animation: heroFadeIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 1s both;
}
.hero-photo-wrap {
    animation: heroPhotoIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}
@keyframes heroFadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes heroPhotoIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}
.hero-bio {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 32px;
}
.hero-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: space-between;
    max-width: 360px;
}
.hero-link.icon-only {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
}
.hero-link.icon-only:hover {
    color: var(--accent);
    transform: translateY(-2px);
    background: transparent;
    box-shadow: none;
}
.hero-link.icon-only svg { width: 20px; height: 20px; }
.hero-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}
.hero-link.primary {
    background: var(--accent);
    color: #fff;
}
.hero-link.primary:hover {
    background: var(--accent-light);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(74, 111, 165, 0.25);
}
.hero-link.secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}
.hero-link.secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.hero-link svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ── Dark mode toggle ── */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 10px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s, border-color 0.3s, background 0.3s;
    flex-shrink: 0;
}
.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-bg);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ── Education ── */
.edu-grid { display: flex; flex-direction: column; gap: 16px; }
.edu-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    display: flex;
    align-items: center;
    gap: 18px;
    transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
}
.edu-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-light);
}
.edu-logo {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.edu-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: none;
    opacity: 1;
    transition: filter 0.4s, opacity 0.4s;
}
.edu-card:hover .edu-logo img {
    filter: none;
    opacity: 1;
}
.edu-info { flex: 1; min-width: 0; }
.edu-card--courses { align-items: flex-start; }
.edu-card--courses .edu-logo { margin-top: 2px; }
.edu-courses-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 0;
    margin-top: 6px;
    transition: color 0.2s;
}
.edu-courses-toggle:hover { color: var(--accent-light); }
.edu-courses-toggle svg {
    width: 14px;
    height: 14px;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.edu-courses-toggle.open svg { transform: rotate(180deg); }
.edu-courses {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s;
    opacity: 0;
}
.edu-courses.open {
    max-height: 300px;
    opacity: 1;
}
.edu-courses ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding-top: 10px;
}
.edu-courses li {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 5px 12px;
    border-radius: 6px;
    transition: border-color 0.2s, color 0.2s;
}
.edu-courses li:hover {
    border-color: var(--accent-light);
    color: var(--accent);
}
.edu-degree {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}
.edu-gpa {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-left: 8px;
}
.edu-school {
    font-size: 14px;
    color: var(--text-secondary);
}
.edu-year {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    white-space: nowrap;
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 100px;
}

/* ── Experience ── */
.timeline { position: relative; }
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    border: none;
    background: repeating-linear-gradient(
        to bottom,
        var(--border) 0px,
        var(--border) 8px,
        transparent 8px,
        transparent 20px
    );
}
.timeline-item {
    position: relative;
    padding-left: 48px;
    padding-bottom: 40px;
    display: flex;
    align-items: center;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
    position: absolute;
    left: 9px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--border);
    z-index: 1;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 0 0 4px var(--bg);
}
.timeline-item:first-child .timeline-dot {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--bg), 0 0 0 6px var(--accent-bg);
}
.timeline-item:hover .timeline-dot {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.3);
    box-shadow: 0 0 0 4px var(--bg), 0 0 0 6px var(--accent-bg);
}
.timeline-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.timeline-item:hover .timeline-card {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-light);
}
.timeline-logo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--sage);
}
.timeline-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: none;
    opacity: 1;
    transition: filter 0.4s, opacity 0.4s;
}
.timeline-item:hover .timeline-logo img {
    filter: none;
    opacity: 1;
}
.timeline-content { flex: 1; min-width: 0; }
.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.timeline-role {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}
.timeline-date {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    white-space: nowrap;
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 100px;
}
.timeline-org {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 10px;
}
.timeline-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ── Publications ── */
.pub-list { display: flex; flex-direction: column; gap: 16px; }
.pub-thumb {
    width: 100%;
    height: 160px;
    object-fit: contain;
    border-radius: 8px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    display: block;
    background: var(--bg-card);
    padding: 8px;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.pub-card:hover .pub-thumb {
    transform: scale(1.02);
}
.pub-thumb-row {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}
.pub-thumb-row .pub-thumb {
    width: 50%;
    margin-bottom: 0;
}

.pub-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    padding-left: 32px;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
                box-shadow 0.35s cubic-bezier(0.22, 1, 0.36, 1),
                border-color 0.35s cubic-bezier(0.22, 1, 0.36, 1),
                background 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    overflow: hidden;
}
.pub-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.pub-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--accent-light);
    background: var(--accent-bg);
}
.pub-card:hover::before {
    transform: scaleY(1);
}
.pub-card .pub-title,
.pub-card .pub-authors,
.pub-card .pub-meta {
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.pub-card:hover .pub-title { transform: translateX(4px); }
.pub-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    line-height: 1.4;
}
.pub-authors {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.6;
}
.pub-authors strong { color: var(--text); font-weight: 600; }
.pub-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.pub-venue {
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    background: var(--gold);
    padding: 4px 12px;
    border-radius: 100px;
}
.pub-year {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
}
.pub-doi {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}
.pub-doi:hover { color: var(--accent-light); }
.pub-doi svg { width: 12px; height: 12px; }
.pub-badge {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    background: var(--accent-bg);
    padding: 3px 10px;
    border-radius: 100px;
}
.pub-badge--oral {
    color: #7c4a1e;
    background: #fef0e4;
}
.pub-badge--journal {
    color: #1a5c38;
    background: #e4f5ec;
}
[data-theme="dark"] .pub-badge--oral { color: #e8a87c; background: rgba(228, 120, 40, 0.12); }
[data-theme="dark"] .pub-badge--journal { color: #5ec48a; background: rgba(40, 180, 100, 0.1); }
.scholar-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: all 0.25s;
}
.scholar-link:hover {
    border-color: var(--accent);
    background: var(--accent-bg);
    transform: translateY(-1px);
}
.scholar-link svg { width: 16px; height: 16px; }
.pub-links {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    flex-wrap: wrap;
}

/* ── Projects ── */
.project-grid { display: flex; flex-direction: column; gap: 16px; }
.project-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
}
.project-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-light);
}
.project-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}
.project-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tag {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-bg);
    padding: 4px 10px;
    border-radius: 6px;
}

/* ── Skills ── */
#skills .skills-tags {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}
#skills .skill-tag {
    justify-content: center;
}
.skills-group { margin-bottom: 28px; }
.skills-group:last-child { margin-bottom: 0; }
.skills-group-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}
.skills-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    padding: 10px 18px;
    border-radius: 10px;
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    cursor: default;
}
.skill-tag:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-bg);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.skill-tag i,
.skill-tag svg {
    font-size: 20px;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.skill-tag:hover i,
.skill-tag:hover svg {
    transform: scale(1.15);
}
.skill-tag .skill-icon-color { color: var(--text-tertiary); transition: color 0.3s; }
.skill-tag:hover .skill-icon-color { color: var(--accent); }

/* ── Footer ── */
footer {
    border-top: 1px solid var(--border);
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 40px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}
.footer-links {
    display: flex;
    gap: 20px;
}
.footer-links a {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }

/* ── Scroll to Top ── */
.scroll-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 4px 14px rgba(74, 111, 165, 0.25);
    z-index: 999;
}
.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.scroll-top:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 111, 165, 0.35);
}
.scroll-top svg { width: 20px; height: 20px; }

/* ── Mobile ── */
@media (max-width: 640px) {
    .section { padding: 40px 16px; }
    .section-title { font-size: 24px; margin-bottom: 24px; }

    /* Nav */
    .nav-sub { display: none; }
    main { padding-top: var(--nav-height); }
    .nav-pages a { font-size: 13px; padding: 6px 10px; }
    .nav-sections { display: none; }
    .nav-sections.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--nav-bg-scroll);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        padding: 12px 20px;
        gap: 4px;
        animation: fadeIn 0.2s ease;
    }
    .nav-mobile-toggle { display: block; }

    /* Hero */
    .hero {
        padding: 60px 16px 40px;
        flex-direction: column;
        text-align: center;
        gap: 28px;
    }
    .hero-photo { width: 160px; height: 160px; }
    .hero-photo-wrap { align-items: center; }
    .hero-links { justify-content: center; flex-wrap: wrap; }
    .hero-link { padding: 8px 16px; font-size: 13px; }
    .hero h1 { font-size: 30px; white-space: nowrap; }
    .hero-bio { font-size: 15px; margin-bottom: 24px; }
    .hero-address { font-size: 11px; }

    /* News */
    .news-item { gap: 12px; }
    .news-date { min-width: 75px; font-size: 12px; }
    .news-text { font-size: 13px; }

    /* Education */
    .edu-card { flex-direction: column; gap: 10px; align-items: flex-start !important; }
    .edu-gpa { display: block; margin-left: 0; margin-top: 2px; }

    /* Experience */
    .timeline-header { flex-direction: column; gap: 6px; }
    .timeline::before { left: 11px; }
    .timeline-item { padding-left: 36px; }
    .timeline-dot { left: 5px; }
    .timeline-card { flex-direction: column; gap: 12px; padding: 20px; }

    /* Publications */
    .pub-card { padding: 20px; }
    .pub-title { font-size: 15px; }
    .pub-links { flex-direction: column; }
    .pub-links .scholar-link { justify-content: center; }

    /* Skills */
    #skills .skills-tags { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
    .skill-tag { padding: 8px 14px; font-size: 12px; }

    /* Footer */
    .footer-inner { flex-direction: column; text-align: center; }
    .scroll-top { bottom: 16px; right: 16px; width: 36px; height: 36px; border-radius: 10px; }
}