:root {
    --ink: #111827;
    --muted: #556070;
    --soft: #eef3f7;
    --paper: #fbfcfd;
    --panel: #ffffff;
    --line: #d8e0e8;
    --navy: #123454;
    --teal: #0f7f8d;
    --cyan: #57c4d5;
    --amber: #bc7a28;
    --shadow: 0 20px 60px rgba(13, 32, 53, 0.11);
    --radius: 8px;
    --max: 1180px;
    --font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --serif: Georgia, "Times New Roman", serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: var(--font);
    line-height: 1.55;
    text-rendering: optimizeLegibility;
}

body.nav-open {
    overflow: hidden;
}

a {
    color: inherit;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -4rem;
    z-index: 20;
    background: var(--navy);
    color: white;
    padding: 0.7rem 1rem;
    border-radius: var(--radius);
    transition: top 0.2s ease;
}

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

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 10;
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
    background: rgba(8, 18, 31, 0.52);
    backdrop-filter: blur(18px);
}

.site-header.scrolled {
    background: rgba(251, 252, 253, 0.93);
    border-bottom-color: rgba(18, 52, 84, 0.12);
}

.site-header.scrolled .brand,
.site-header.scrolled .nav-links a,
.site-header.scrolled .nav-toggle span {
    color: var(--ink);
}

.nav-shell {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0.82rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: white;
    text-decoration: none;
    font-weight: 760;
}

.brand-mark {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.34);
    border-radius: 50%;
    color: white;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.78rem;
}

.site-header.scrolled .brand-mark {
    color: var(--navy);
    border-color: rgba(18, 52, 84, 0.2);
    background: rgba(18, 52, 84, 0.05);
}

.brand-text {
    letter-spacing: 0.01em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.05rem;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.86);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 680;
    letter-spacing: 0.02em;
}

.nav-links a:hover {
    color: var(--cyan);
}

.nav-toggle {
    display: none;
    width: 2.35rem;
    height: 2.35rem;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: var(--radius);
    background: transparent;
    color: white;
    padding: 0.55rem;
}

.nav-toggle span {
    display: block;
    height: 2px;
    margin: 4px 0;
    background: currentColor;
}

.hero {
    min-height: 94vh;
    position: relative;
    display: grid;
    align-items: end;
    overflow: hidden;
    background: #06111d;
}

.hero-image,
.hero-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero-image {
    object-fit: cover;
    object-position: center;
    opacity: 0.92;
}

.hero-overlay {
    background:
        linear-gradient(90deg, rgba(4, 13, 23, 0.92) 0%, rgba(4, 13, 23, 0.76) 34%, rgba(4, 13, 23, 0.2) 72%),
        linear-gradient(0deg, rgba(4, 13, 23, 0.92) 0%, rgba(4, 13, 23, 0.08) 45%, rgba(4, 13, 23, 0.48) 100%);
}

.hero-content {
    position: relative;
    width: min(var(--max), calc(100% - 2.5rem));
    margin: 0 auto;
    padding: 8rem 0 4rem;
    color: white;
}

.eyebrow,
.section-kicker {
    margin: 0 0 0.7rem;
    color: var(--teal);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    font-weight: 800;
}

.hero .eyebrow {
    color: #88e1ec;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

.hero h1 {
    max-width: 860px;
    margin-bottom: 1.1rem;
    font-size: clamp(2.55rem, 6vw, 5.9rem);
    line-height: 0.98;
    letter-spacing: -0.04em;
}

.hero-lede {
    max-width: 680px;
    color: rgba(255, 255, 255, 0.83);
    font-size: clamp(1.05rem, 1.8vw, 1.32rem);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 1.7rem 0 2.3rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.85rem;
    padding: 0.78rem 1.05rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 760;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button.primary {
    background: #d6f7fb;
    color: #06111d;
    box-shadow: 0 12px 32px rgba(87, 196, 213, 0.2);
}

.button.secondary {
    border: 1px solid rgba(255, 255, 255, 0.34);
    color: white;
    background: rgba(255, 255, 255, 0.08);
}

.hero-facts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.85rem;
    max-width: 980px;
    margin: 0;
}

.hero-facts article {
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius);
    padding: 0.95rem;
    background: rgba(5, 18, 31, 0.48);
}

.hero-facts h2 {
    margin: 0;
    color: #8de0ec;
    font-size: 0.74rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero-facts p {
    margin: 0.35rem 0 0;
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.95rem;
}

.section-inner {
    width: min(var(--max), calc(100% - 2.5rem));
    margin: 0 auto;
}

.intro-band {
    padding: 4.8rem 0;
    background: var(--panel);
}

.intro-grid,
.contact-grid,
.teaching-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.4fr;
    gap: 3rem;
    align-items: start;
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(250px, 0.68fr) 1.32fr;
    gap: 3rem;
    align-items: center;
}

.profile-photo {
    margin: 0;
}

.profile-photo img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    object-position: center 38%;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.about-copy h2 {
    margin-bottom: 1.2rem;
    color: var(--navy);
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.05;
    letter-spacing: -0.035em;
}

.about-copy p:not(.section-kicker) {
    color: var(--muted);
    font-size: 1.08rem;
}

.intro-grid h2,
.section-heading h2,
.teaching-grid h2,
.contact-grid h2 {
    margin-bottom: 0;
    color: var(--navy);
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.05;
    letter-spacing: -0.035em;
}

.intro-copy {
    color: var(--muted);
    font-size: 1.08rem;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    margin-top: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    transform: translateY(-1.5rem);
    box-shadow: var(--shadow);
}

.metrics article {
    background: var(--paper);
    padding: 1.2rem;
}

.metric-value {
    display: block;
    color: var(--navy);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    line-height: 1;
    font-weight: 850;
    letter-spacing: -0.04em;
}

.metric-label {
    display: block;
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.section-block {
    padding: 5.2rem 0;
}

.section-block.alt {
    background: var(--soft);
}

.section-heading {
    max-width: 760px;
    margin-bottom: 2.4rem;
}

.section-heading p:not(.section-kicker) {
    margin: 0.9rem 0 0;
    color: var(--muted);
    font-size: 1.05rem;
}

.section-heading.split {
    max-width: none;
    display: grid;
    grid-template-columns: 0.9fr 1fr;
    gap: 3rem;
    align-items: end;
}

.pillar-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.pillar,
.teaching-panel,
.contact-card,
.publication-list article,
.document-grid a {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    box-shadow: 0 12px 34px rgba(13, 32, 53, 0.06);
}

.pillar {
    padding: 1.35rem;
}

.pillar-number {
    display: inline-block;
    margin-bottom: 1.3rem;
    color: var(--amber);
    font-size: 0.82rem;
    font-weight: 820;
}

.pillar h3,
.impact-item h3,
.publication-list h3,
.teaching-panel h3 {
    margin-bottom: 0.55rem;
    color: var(--navy);
    line-height: 1.2;
}

.pillar p,
.impact-item p,
.publication-list p,
.teaching-grid p,
.teaching-panel li {
    color: var(--muted);
}

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

.impact-item {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 1.5rem;
    padding: 1.3rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
}

.impact-item.featured {
    border-color: rgba(15, 127, 141, 0.34);
    box-shadow: var(--shadow);
}

.impact-meta {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.impact-meta span,
.pub-year,
.document-grid span {
    color: var(--teal);
    font-size: 0.76rem;
    font-weight: 820;
    text-transform: uppercase;
    letter-spacing: 0.09em;
}

.impact-meta strong {
    color: var(--ink);
}

.impact-item a {
    color: var(--teal);
    font-weight: 760;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.experience-layout {
    display: grid;
    grid-template-columns: 0.75fr 1.25fr;
    gap: 3.2rem;
    align-items: start;
}

.sticky-heading {
    position: sticky;
    top: 6rem;
    margin-bottom: 0;
}

.timeline {
    border-left: 2px solid var(--line);
    padding-left: 1.4rem;
}

.timeline article {
    position: relative;
    padding: 0 0 2rem;
}

.timeline article::before {
    content: "";
    position: absolute;
    left: calc(-1.4rem - 6px);
    top: 0.35rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--teal);
    box-shadow: 0 0 0 5px var(--paper);
}

.timeline article:last-child {
    padding-bottom: 0;
}

.date {
    color: var(--amber);
    font-weight: 780;
    font-size: 0.88rem;
}

.timeline h3 {
    margin: 0.25rem 0 0.4rem;
    color: var(--navy);
}

.timeline p {
    color: var(--muted);
}

.publication-list {
    display: grid;
    gap: 0.75rem;
}

.publication-list article {
    padding: 1rem 1.15rem;
}

.publication-list h3 {
    margin-top: 0.25rem;
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.publication-list p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

.teaching-grid {
    align-items: center;
}

.teaching-panel {
    padding: 1.5rem;
}

.teaching-panel ul {
    margin: 0;
    padding-left: 1.15rem;
}

.teaching-panel li + li {
    margin-top: 0.7rem;
}

.docs-block {
    background: linear-gradient(180deg, var(--paper), #edf5f7);
}

.document-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.document-grid a {
    min-height: 9.4rem;
    padding: 1.15rem;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.16s ease, border-color 0.16s ease;
}

.document-grid a:hover {
    transform: translateY(-2px);
    border-color: rgba(15, 127, 141, 0.45);
}

.document-grid strong {
    color: var(--navy);
    font-size: 1.05rem;
    line-height: 1.2;
}

.contact-section {
    padding: 5.2rem 0;
    background: #07131f;
    color: white;
}

.contact-grid h2 {
    color: white;
}

.contact-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.16);
    padding: 1.35rem;
    box-shadow: none;
}

.contact-card a {
    display: block;
    padding: 0.85rem 0;
    color: rgba(255, 255, 255, 0.86);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.contact-card a:last-child {
    border-bottom: 0;
}

.contact-card a:hover {
    color: #8de0ec;
}

.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.35rem max(1.25rem, calc((100% - var(--max)) / 2));
    color: var(--muted);
    background: #f4f7fa;
    border-top: 1px solid var(--line);
    font-size: 0.9rem;
}

.site-footer p {
    margin: 0;
}

.site-footer a {
    color: var(--navy);
    font-weight: 760;
    text-decoration: none;
}

.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

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

@media (max-width: 980px) {
    .hero {
        min-height: 88vh;
    }

    .hero-facts,
    .metrics,
    .pillar-grid,
    .document-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .intro-grid,
    .about-layout,
    .section-heading.split,
    .experience-layout,
    .teaching-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 1.6rem;
    }

    .profile-photo {
        max-width: 420px;
    }

    .sticky-heading {
        position: static;
    }
}

@media (max-width: 760px) {
    .nav-toggle {
        display: inline-block;
    }

    .nav-links {
        position: fixed;
        inset: 4rem 1rem auto;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.7rem;
        border: 1px solid var(--line);
        border-radius: var(--radius);
        background: rgba(251, 252, 253, 0.98);
        box-shadow: var(--shadow);
    }

    .nav-links a {
        color: var(--ink);
        padding: 0.85rem;
        border-radius: 6px;
    }

    .nav-links a:hover {
        background: var(--soft);
    }

    body.nav-open .nav-links {
        display: flex;
    }

    .brand-text {
        display: none;
    }

    .hero {
        min-height: auto;
    }

    .hero-content {
        width: min(100% - 2rem, var(--max));
        padding-top: 7.8rem;
        padding-bottom: 2.5rem;
    }

    .hero-overlay {
        background:
            linear-gradient(90deg, rgba(4, 13, 23, 0.94), rgba(4, 13, 23, 0.62)),
            linear-gradient(0deg, rgba(4, 13, 23, 0.96), rgba(4, 13, 23, 0.18));
    }

    .hero-facts,
    .metrics,
    .pillar-grid,
    .document-grid {
        grid-template-columns: 1fr;
    }

    .section-inner {
        width: min(100% - 2rem, var(--max));
    }

    .intro-band,
    .section-block,
    .contact-section {
        padding: 3.6rem 0;
    }

    .metrics {
        transform: none;
        margin-top: 1rem;
    }

    .impact-item {
        grid-template-columns: 1fr;
        gap: 0.65rem;
    }

    .site-footer {
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}