:root {
  --ink: #10223d;
  --ink-soft: #4c5d70;
  --paper: #f5f1e9;
  --surface: #fffdf9;
  --line: #dcd4c7;
  --blue: #1f5f9f;
  --blue-dark: #174878;
  --teal: #147d76;
  --teal-soft: #e1f2ef;
  --blue-soft: #e8f0fa;
  --warm: #efe7da;
  --shadow: 0 18px 50px rgba(16, 34, 61, .09);
  --radius: 22px;
  --shell: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 9% 5%, rgba(31, 95, 159, .09), transparent 28rem),
    radial-gradient(circle at 94% 26%, rgba(20, 125, 118, .08), transparent 30rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #f3a712; outline-offset: 4px; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 100; padding: 10px 14px; border-radius: 10px; background: var(--ink); color: white; font-weight: 800; }
.skip-link:focus { top: 12px; }
.shell { width: min(calc(100% - 40px), var(--shell)); margin-inline: auto; }
.surface { background: rgba(255, 253, 249, .94); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(220, 212, 199, .92); background: rgba(245, 241, 233, .9); backdrop-filter: blur(14px); }
.nav-shell { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 850; letter-spacing: -.02em; }
.brand-mark { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 14px; color: white; background: linear-gradient(135deg, var(--blue), var(--teal)); box-shadow: 0 8px 22px rgba(31, 95, 159, .22); font-size: 13px; letter-spacing: .02em; }
.primary-nav { display: flex; align-items: center; gap: 4px; }
.primary-nav a { min-height: 44px; display: inline-flex; align-items: center; padding: 8px 12px; border-radius: 999px; color: var(--ink-soft); text-decoration: none; font-size: 14px; font-weight: 760; }
.primary-nav a:hover { color: var(--ink); background: var(--surface); }
.menu-toggle { display: none; min-height: 44px; align-items: center; gap: 9px; border: 1px solid var(--line); border-radius: 12px; padding: 9px 12px; color: var(--ink); background: var(--surface); font: inherit; font-weight: 800; cursor: pointer; }
.menu-icon, .menu-icon::before, .menu-icon::after { width: 18px; height: 2px; display: block; border-radius: 2px; background: currentColor; transition: transform .2s ease; }
.menu-icon { position: relative; }
.menu-icon::before, .menu-icon::after { content: ""; position: absolute; left: 0; }
.menu-icon::before { top: -6px; }
.menu-icon::after { top: 6px; }
.menu-toggle[aria-expanded="true"] .menu-icon { background: transparent; }
.menu-toggle[aria-expanded="true"] .menu-icon::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-icon::after { top: 0; transform: rotate(-45deg); }

.hero { display: grid; grid-template-columns: 1.18fr .82fr; gap: 20px; padding-block: 42px 18px; }
.hero-copy { padding: clamp(24px, 4vw, 48px); }
.eyebrow, .kicker, .label { margin: 0; color: var(--blue-dark); font-size: 12px; font-weight: 850; letter-spacing: .09em; text-transform: uppercase; }
.eyebrow { width: fit-content; padding: 8px 12px; border-radius: 999px; background: var(--blue-soft); }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { max-width: 770px; margin: 18px 0 16px; font-size: clamp(42px, 5.5vw, 72px); line-height: .99; letter-spacing: -.055em; }
h2 { margin: 6px 0 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.08; letter-spacing: -.04em; }
h3 { margin: 0; font-size: 21px; line-height: 1.25; letter-spacing: -.025em; }
.hero-lead { max-width: 760px; margin: 0; color: var(--ink-soft); font-size: 18px; }
.topic-list, .tags, .actions, .inline-links, .centered-links { display: flex; flex-wrap: wrap; gap: 10px; }
.topic-list { margin-top: 24px; }
.topic-list span, .tags span { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 999px; background: #fbf9f4; }
.topic-list span { min-height: 38px; padding: 7px 12px; font-size: 13px; }
.actions { margin-top: 26px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; border-radius: 13px; padding: 11px 16px; text-decoration: none; font-weight: 850; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: linear-gradient(135deg, var(--blue), var(--teal)); box-shadow: 0 10px 24px rgba(31, 95, 159, .22); }
.button-secondary { border: 1px solid var(--line); background: var(--surface); }
.inline-links a { color: var(--blue-dark); font-weight: 800; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.hero-side { display: grid; gap: 16px; }
.portrait { margin: 0; padding: 14px; overflow: hidden; }
.portrait img { width: 100%; height: 100%; min-height: 360px; display: block; border-radius: 16px; object-fit: cover; object-position: center 35%; }
.availability { display: flex; align-items: flex-start; gap: 12px; padding: 20px; }
.availability p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }
.status-dot { width: 11px; height: 11px; margin-top: 7px; flex: 0 0 auto; border-radius: 50%; background: #21a179; box-shadow: 0 0 0 5px rgba(33, 161, 121, .12); }

.profile-strip { padding-block: 10px 18px; }
.profile-strip-label { margin: 0 0 10px; color: var(--ink-soft); font-size: 12px; font-weight: 850; letter-spacing: .09em; text-transform: uppercase; }
.profile-link-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.profile-link-grid a { min-height: 72px; display: flex; align-items: center; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: 0 8px 24px rgba(16,34,61,.06); text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
.profile-link-grid a:hover { transform: translateY(-2px); border-color: var(--blue); }
.profile-link-grid strong, .profile-link-grid small { display: block; }
.profile-link-grid strong { font-size: 13px; line-height: 1.2; }
.profile-link-grid small { margin-top: 3px; color: var(--ink-soft); font-size: 10px; line-height: 1.25; }
.profile-mark { width: 38px; height: 38px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 11px; color: white; font-size: 10px; font-weight: 900; box-shadow: inset 0 0 0 1px rgba(255,255,255,.18); }
.profile-mark img { width: 21px; height: 21px; display: block; filter: invert(1); }
.linkedin-mark { background: #0a66c2; }
.scholar-mark { background: #4285f4; }
.github-mark { background: #181717; }
.orcid-mark { background: #a6ce39; }
.bsu-mark { background: #d64309; letter-spacing: -.03em; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; padding-block: 10px 18px; }
.metric { padding: 19px; }
.metric strong, .metric span, .metric small { display: block; }
.metric strong { color: var(--blue-dark); font-size: 30px; line-height: 1.1; letter-spacing: -.04em; }
.metric span { margin-top: 5px; font-weight: 850; }
.metric small { margin-top: 3px; color: var(--ink-soft); line-height: 1.4; }

.section { padding-block: 54px; }
.section-heading { display: grid; grid-template-columns: 1fr .75fr; align-items: end; gap: 32px; margin-bottom: 22px; }
.section-heading > p { margin: 0; color: var(--ink-soft); }
.research-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 16px; }
.research-feature, .compact-card { padding: clamp(22px, 3vw, 32px); }
.research-feature { background: linear-gradient(145deg, rgba(232, 240, 250, .94), rgba(255, 253, 249, .96)); }
.research-feature h3 { max-width: 720px; margin-top: 10px; font-size: clamp(25px, 3.4vw, 36px); }
.research-feature > p:not(.label), .compact-card p:last-child { color: var(--ink-soft); }
.evidence-list { margin: 18px 0; padding-left: 20px; color: var(--ink-soft); }
.evidence-list li { margin-block: 8px; }
.research-stack { display: grid; gap: 16px; }
.compact-card h3 { margin-top: 8px; }
.compact-card p { margin-bottom: 0; }

.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.project-card { min-height: 100%; display: flex; flex-direction: column; padding: 22px; }
.project-card.featured { grid-column: span 1; border-top: 4px solid var(--teal); }
.project-top { display: flex; justify-content: space-between; gap: 14px; margin-bottom: 13px; color: var(--blue-dark); font-size: 11px; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }
.project-card > p { color: var(--ink-soft); }
.tags { margin-block: auto 18px; }
.tags span { min-height: 31px; padding: 5px 9px; font-size: 11px; }
.card-link { width: fit-content; color: var(--blue-dark); font-weight: 850; text-decoration: none; }
.card-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.more-projects { margin-top: 16px; overflow: hidden; }
.more-projects summary { min-height: 54px; display: flex; align-items: center; justify-content: space-between; padding: 15px 20px; cursor: pointer; font-weight: 850; }
.more-projects summary::after { content: "+"; color: var(--blue); font-size: 24px; }
.more-projects[open] summary::after { content: "−"; }
.more-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; border-top: 1px solid var(--line); background: var(--line); }
.more-grid a { display: flex; flex-direction: column; gap: 4px; padding: 18px; background: var(--surface); text-decoration: none; }
.more-grid a:hover strong { color: var(--blue); }
.more-grid span { color: var(--ink-soft); font-size: 13px; }

.publication-list { display: grid; gap: 12px; }
.publication { display: grid; grid-template-columns: 84px 1fr; gap: 20px; padding: 22px; }
.pub-year { color: var(--blue-dark); font-size: 25px; font-weight: 900; letter-spacing: -.04em; }
.pub-status { display: inline-flex; margin-bottom: 6px; padding: 4px 8px; border-radius: 999px; color: #0b625b; background: var(--teal-soft); font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .05em; }
.pub-status.preprint { color: var(--blue-dark); background: var(--blue-soft); }
.publication h3 a { text-decoration: none; }
.publication h3 a:hover { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.publication p { margin: 7px 0 0; color: var(--ink-soft); font-size: 14px; }
.centered-links { justify-content: center; margin-top: 18px; }

.timeline-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.timeline { padding: 24px; }
.timeline h3 { margin-top: 7px; }
.timeline p, .timeline ul { color: var(--ink-soft); }
.timeline .institution { margin: 5px 0 12px; color: var(--ink); font-weight: 800; }
.timeline ul { padding-left: 20px; }
.timeline li { margin-block: 7px; }
.skill-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.skill-grid article { padding: 21px; }
.skill-grid p { margin-bottom: 0; color: var(--ink-soft); font-size: 14px; }

.contact-section { padding-block: 42px 70px; }
.contact-card { padding: clamp(28px, 5vw, 52px); border-radius: 28px; color: white; background: linear-gradient(135deg, #102b50 0%, #174e70 55%, #147d76 100%); box-shadow: 0 24px 60px rgba(16, 43, 80, .24); }
.contact-card .kicker { color: #a9e2dc; }
.contact-card h2 { max-width: 780px; }
.contact-card > p:not(.kicker) { max-width: 780px; color: #dce9ef; }
.button-light { color: var(--ink); background: white; }
.button-outline-light { border: 1px solid rgba(255,255,255,.5); color: white; background: rgba(255,255,255,.08); }
.contact-meta { margin: 22px 0 0; font-size: 14px; }
.site-footer { border-top: 1px solid var(--line); color: var(--ink-soft); }
.site-footer .shell { min-height: 84px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }

@media (max-width: 980px) {
  .hero, .research-grid { grid-template-columns: 1fr; }
  .hero-side { grid-template-columns: .85fr 1.15fr; }
  .portrait img { min-height: 280px; }
  .metrics, .project-grid, .skill-grid { grid-template-columns: repeat(2, 1fr); }
  .more-grid { grid-template-columns: repeat(2, 1fr); }
  .profile-link-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 76px; }
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .nav-shell { min-height: 68px; flex-wrap: wrap; gap: 8px; padding-block: 10px; }
  .brand { font-size: 15px; }
  .brand-mark { width: 40px; height: 40px; border-radius: 12px; }
  .menu-toggle { display: inline-flex; }
  .primary-nav { width: 100%; display: none; grid-template-columns: repeat(2, 1fr); padding: 8px 0 4px; }
  .primary-nav[data-open="true"] { display: grid; }
  .primary-nav a { justify-content: center; border: 1px solid transparent; }
  .primary-nav a:hover { border-color: var(--line); }
  .hero { padding-top: 22px; }
  .hero-copy { padding: 22px; }
  .hero-side { grid-template-columns: 1fr; }
  .portrait { order: -1; }
  .portrait img { min-height: 300px; }
  h1 { font-size: clamp(40px, 12vw, 54px); }
  .hero-lead { font-size: 16px; }
  .section { padding-block: 42px; }
  .section-heading { grid-template-columns: 1fr; gap: 12px; }
  .metrics, .project-grid, .timeline-grid, .skill-grid, .more-grid { grid-template-columns: 1fr; }
  .profile-link-grid { grid-template-columns: repeat(2, 1fr); }
  .metric { display: grid; grid-template-columns: 70px 1fr; column-gap: 10px; align-items: center; }
  .metric strong { grid-row: span 2; }
  .publication { grid-template-columns: 1fr; gap: 8px; }
  .pub-year { font-size: 18px; }
  .site-footer .shell { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0; padding-block: 20px; }
  .site-footer p { margin: 3px 0; }
}

@media (max-width: 430px) {
  .brand > span:last-child { max-width: 150px; line-height: 1.15; }
  .menu-label { display: none; }
  .actions .button { width: 100%; }
  .topic-list { gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media print {
  .site-header, .actions, .profile-strip, .more-projects, .site-footer { display: none !important; }
  body { background: white; color: black; }
  .shell { width: 100%; }
  .surface { box-shadow: none; break-inside: avoid; }
}