:root {
    --font-main: "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
    --max-width: 1180px;
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --space-2xs: 0.35rem;
    --space-xs: 0.7rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.25rem;
    --space-xl: 3.5rem;
    --space-2xl: 5.5rem;
    --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.12);
    --shadow-strong: 0 28px 75px rgba(0, 0, 0, 0.2);
    --transition-fast: 180ms ease;
    --transition-base: 280ms ease;
}

body.dark {
    --bg: #07111f;
    --bg-alt: #0d1a2d;
    --hero: rgba(10, 20, 38, 0.9);
    --surface: rgba(13, 26, 45, 0.82);
    --surface-strong: rgba(16, 31, 54, 0.96);
    --border: rgba(150, 178, 228, 0.18);
    --text: #f4f7fb;
    --muted: #a8b8d4;
    --accent: #7dd3fc;
    --accent-strong: #a78bfa;
    --accent-soft: rgba(125, 211, 252, 0.14);
    --focus: #93c5fd;
    --brand-mark-text: #04111f;
    --btn-primary-text: #07111f;
    --hero-gradient: radial-gradient(circle at top left, rgba(125, 211, 252, 0.18), transparent 34%), radial-gradient(circle at top right, rgba(167, 139, 250, 0.18), transparent 34%), linear-gradient(180deg, #07111f 0%, #091525 52%, #07111f 100%);
}

body:not(.dark) {
    --bg: #f6f7fb;
    --bg-alt: #edf2f8;
    --hero: rgba(255, 255, 255, 0.9);
    --surface: rgba(255, 255, 255, 0.84);
    --surface-strong: rgba(255, 255, 255, 0.97);
    --border: rgba(37, 56, 88, 0.12);
    --text: #111827;
    --muted: #53627e;
    --accent: #0f5fd7;
    --accent-strong: #6d4aff;
    --accent-soft: rgba(15, 95, 215, 0.08);
    --focus: #2563eb;
    --brand-mark-text: #04111f;
    --btn-primary-text: #07111f;
    --hero-gradient: radial-gradient(circle at top left, rgba(15, 95, 215, 0.12), transparent 34%), radial-gradient(circle at top right, rgba(109, 74, 255, 0.1), transparent 34%), linear-gradient(180deg, #f6f7fb 0%, #eef3f9 52%, #f6f7fb 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-main);
    color: var(--text);
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
    line-height: 1.65;
}

img {
    display: block;
    max-width: 100%;
}

button,
a {
    color: inherit;
}

a {
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.2em;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 3px;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 1rem;
    z-index: 1000;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--surface-strong);
    border: 1px solid var(--border);
}

.skip-link:focus {
    left: 1rem;
}

.hero-shell {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    background: var(--hero-gradient);
    border-bottom: 1px solid var(--border);
}

.hero-backdrop {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(120deg, rgba(255, 255, 255, 0.03), transparent 28%),
        radial-gradient(circle at 15% 20%, rgba(125, 211, 252, 0.14), transparent 22%),
        radial-gradient(circle at 85% 15%, rgba(167, 139, 250, 0.14), transparent 24%);
    z-index: -1;
}

.site-nav,
.hero,
main,
.site-footer {
    width: min(var(--max-width), calc(100vw - 2rem));
    margin-left: auto;
    margin-right: auto;
}

.site-nav {
    position: sticky;
    top: 1rem;
    z-index: 20;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: 0.9rem 1.1rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--hero) 90%, transparent);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-soft);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
    font-weight: 700;
}

.brand-mark {
    width: 2.5rem;
    height: 2.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: var(--brand-mark-text);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.brand-text {
    font-size: 0.96rem;
    letter-spacing: 0.01em;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.35rem;
}

.nav-link {
    text-decoration: none;
    color: var(--muted);
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
    font-size: 0.92rem;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover,
.nav-link.is-active {
    background: var(--accent-soft);
    color: var(--text);
}

#toggle-dark {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.65rem 0.95rem;
    font: inherit;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

#toggle-dark:hover {
    transform: translateY(-1px);
    background: var(--accent-soft);
}

.hero {
    padding: 4.5rem 0 4rem;
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.9fr);
    gap: var(--space-lg);
    align-items: start;
}

.hero-copy,
.hero-panel,
.panel,
.contact-note,
.contact-card,
.timeline-card,
.info-card,
.publication-card,
.stat-card,
.about-sidecard {
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-soft);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.hero-copy {
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
}

.eyebrow,
.section-index,
.profile-kicker,
.card-label,
.contact-note-label {
    margin: 0 0 0.8rem;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
}

.hero-copy h1 {
    margin: 0;
    font-size: clamp(2.7rem, 7vw, 5.25rem);
    line-height: 1;
    letter-spacing: -0.05em;
    max-width: 11ch;
    text-wrap: balance;
}

.hero-copy h1 span,
.section-heading h2,
.hero-panel h2,
.contact-note h3 {
    background: linear-gradient(135deg, var(--text) 0%, color-mix(in srgb, var(--accent) 45%, var(--text) 55%) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#tagline {
    margin: 1.4rem 0 0;
    max-width: 60ch;
    font-size: clamp(1.05rem, 2vw, 1.28rem);
    color: color-mix(in srgb, var(--text) 88%, var(--accent) 12%);
}

.hero-points {
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.9rem;
}

.hero-points li {
    position: relative;
    padding-left: 1.4rem;
    color: var(--muted);
}

.hero-points li::before,
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 0.48rem;
    height: 0.48rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.cta-row,
.link-row,
.profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.cta-row {
    margin-top: 2rem;
}

.btn,
.chip-link,
.profile-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.9rem;
    padding: 0.7rem 1.05rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    text-decoration: none;
    font-weight: 600;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover,
.chip-link:hover,
.profile-links a:hover {
    transform: translateY(-1px);
}

.btn-primary {
    border-color: transparent;
    color: var(--btn-primary-text);
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.btn-secondary,
.chip-link,
.profile-links a {
    background: color-mix(in srgb, var(--surface-strong) 86%, transparent);
}

.chip-primary {
    background: var(--accent-soft);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border) 65%);
    color: var(--text);
}

.hero-stats {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-sm);
}

.stat-card {
    border-radius: var(--radius-md);
    padding: 1.15rem;
}

.stat-num {
    display: block;
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.stat-label {
    display: block;
    margin-top: 0.55rem;
    color: var(--muted);
    font-size: 0.85rem;
}

.hero-panel {
    padding: var(--space-lg);
    border-radius: var(--radius-xl);
}

.profile-head {
    display: grid;
    grid-template-columns: 132px 1fr;
    gap: var(--space-md);
    align-items: center;
}

.profile-pic {
    width: 132px;
    height: 132px;
    border-radius: 24px;
    object-fit: cover;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.25);
}

.hero-panel h2,
.section-heading h2,
.contact-note h3 {
    margin: 0;
    font-size: clamp(1.4rem, 2.4vw, 2.1rem);
    line-height: 1.1;
}

.hero-panel p,
.about-copy p,
.timeline-card p,
.info-card p,
.publication-card p,
.contact-copy p,
.contact-note p {
    color: var(--muted);
}

.profile-details {
    margin: 1.5rem 0;
    display: grid;
    gap: 0.9rem;
}

.profile-details div {
    display: grid;
    gap: 0.2rem;
}

.profile-details dt {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

.profile-details dd {
    margin: 0;
    font-weight: 600;
}

.profile-details dd a {
    color: inherit;
}

.topic-pills,
.check-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.topic-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-bottom: 1.5rem;
}

.topic-pills li {
    padding: 0.45rem 0.8rem;
    border-radius: 999px;
    background: var(--accent-soft);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border) 78%);
    font-size: 0.84rem;
}

main {
    padding: var(--space-2xl) 0;
    display: grid;
    gap: var(--space-lg);
}

.panel {
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.section-heading {
    display: grid;
    grid-template-columns: 90px minmax(0, 1fr);
    gap: var(--space-md);
    align-items: start;
    margin-bottom: var(--space-lg);
}

.section-heading p:last-child {
    margin: 0.5rem 0 0;
    color: var(--muted);
    max-width: 64ch;
}

.about-grid,
.contact-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr);
    gap: var(--space-lg);
}

.about-copy {
    display: grid;
    gap: 1rem;
}

.about-copy p {
    margin: 0;
}

.lead {
    font-size: 1.1rem;
    color: color-mix(in srgb, var(--text) 88%, var(--accent) 12%);
}

.about-sidecard,
.contact-note {
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.about-sidecard h3 {
    margin-top: 0;
    margin-bottom: 1rem;
}

.check-list {
    display: grid;
    gap: 1rem;
}

.check-list li {
    position: relative;
    padding-left: 1.35rem;
    color: var(--muted);
}

.timeline {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-md);
}

.timeline-item {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: var(--space-md);
    align-items: start;
}

.timeline-year {
    padding-top: 0.95rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.timeline-card {
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
}

.timeline-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 -0.6rem;
    width: 2px;
    background: color-mix(in srgb, var(--accent) 28%, transparent);
}

.timeline-item-current .timeline-card {
    border-color: color-mix(in srgb, var(--accent) 36%, var(--border) 64%);
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.16);
}

.timeline-card h3,
.info-card h3,
.publication-card h3,
.contact-note h3 {
    margin: 0 0 0.8rem;
    line-height: 1.3;
}

.card-grid {
    display: grid;
    gap: var(--space-md);
}

.three-up,
.code-grid,
.publication-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.publication-card {
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.info-card-accent,
.publication-card-featured,
.contact-card-primary {
    border-color: color-mix(in srgb, var(--accent) 36%, var(--border) 64%);
    background: color-mix(in srgb, var(--surface-strong) 92%, var(--accent-soft) 8%);
}

.pub-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.95rem;
}

.pub-year,
.pub-tag {
    display: inline-flex;
    align-items: center;
    min-height: 1.85rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.pub-year {
    background: var(--accent-soft);
    color: var(--accent);
}

.pub-tag {
    border: 1px solid var(--border);
    color: var(--muted);
}

.contact-copy p {
    margin-top: 0;
    font-size: 1.02rem;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-sm);
}

.contact-card {
    border-radius: var(--radius-md);
    padding: 1rem 1.05rem;
    text-decoration: none;
    transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.contact-card:hover,
.info-card:hover,
.publication-card:hover,
.timeline-card:hover,
.about-sidecard:hover,
.contact-note:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--accent) 34%, var(--border) 66%);
}

.contact-card span {
    display: block;
    margin-bottom: 0.3rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

.contact-card strong {
    display: block;
    color: var(--text);
    word-break: break-word;
}

.site-footer {
    padding-bottom: 1.5rem;
    text-align: center;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.83rem;
}

.view-counter {
    margin-top: 0.9rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.view-counter-card {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    min-width: 128px;
    padding: 0.65rem 0.85rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface-strong) 92%, transparent);
    border: 1px solid var(--border);
}

.view-counter-label {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.7rem;
}

.view-counter-badge {
    height: 20px;
    width: auto;
    border-radius: 999px;
}

.view-counter-value {
    color: var(--text);
}

.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 540ms ease, transform 540ms ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1120px) {
    .hero,
    .about-grid,
    .contact-layout,
    .publication-grid,
    .three-up,
    .code-grid {
        grid-template-columns: 1fr;
    }

    .hero-copy h1 {
        max-width: 13ch;
    }
}

@media (max-width: 860px) {
    .site-nav {
        border-radius: var(--radius-lg);
        flex-wrap: wrap;
        justify-content: center;
    }

    .section-heading,
    .timeline-item,
    .profile-head {
        grid-template-columns: 1fr;
    }

    .timeline-year {
        padding-top: 0;
    }

    .timeline-card::before {
        display: none;
    }

    .hero-copy,
    .hero-panel,
    .panel {
        padding: var(--space-lg);
    }

    .contact-cards,
    .hero-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .site-nav,
    .hero,
    main,
    .site-footer {
        width: min(var(--max-width), calc(100vw - 1rem));
    }

    .hero {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }

    .brand {
        justify-content: center;
        width: 100%;
    }

    .nav-links {
        width: 100%;
    }

    #toggle-dark {
        width: 100%;
    }

    .profile-pic {
        width: 108px;
        height: 108px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}