:root {
  --ink: #101c29;
  --navy: #0b1724;
  --navy-2: #12283b;
  --paper: #f5f7f7;
  --white: #ffffff;
  --muted: #526370;
  --line: #ccd5d8;
  --aqua: #55d4c5;
  --aqua-dark: #1b8277;
  --soft-aqua: #dff7f3;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: 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; }
.skip-link { position: fixed; top: -60px; left: 1rem; z-index: 100; padding: .7rem 1rem; background: var(--white); }
.skip-link:focus { top: 1rem; }
.section-shell { width: min(calc(100% - 3rem), var(--max)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  padding: 0 max(1.5rem, calc((100vw - var(--max)) / 2));
  color: var(--white);
  background: rgba(11, 23, 36, .94);
  border-bottom: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: .85rem; font-weight: 700; text-decoration: none; letter-spacing: -.01em; }
.brand-mark { display: grid; place-items: center; width: 2.3rem; height: 2.3rem; color: var(--navy); background: var(--aqua); font-size: .78rem; font-weight: 900; letter-spacing: .08em; }
.primary-nav { display: flex; align-items: center; gap: 1.8rem; }
.primary-nav a { color: #d6e0e5; text-decoration: none; font-size: .9rem; font-weight: 650; }
.primary-nav a:hover, .primary-nav a:focus-visible { color: var(--aqua); }
.primary-nav .nav-contact { padding: .55rem .9rem; color: var(--navy); background: var(--aqua); }
.menu-button { display: none; border: 1px solid rgba(255,255,255,.35); color: var(--white); background: transparent; padding: .5rem .75rem; font: inherit; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, .7fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: center;
  min-height: calc(100vh - 78px);
  padding-block: clamp(5rem, 10vw, 9rem);
}
.hero::before { content: ""; position: fixed; inset: 0 0 auto auto; z-index: -1; width: 37vw; height: 70vh; background: linear-gradient(145deg, rgba(85,212,197,.12), transparent 70%); pointer-events: none; }
.eyebrow { margin: 0 0 1.15rem; color: var(--aqua-dark); font-size: .76rem; font-weight: 850; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { max-width: 850px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.4rem, 7.4vw, 7rem); font-weight: 400; line-height: .98; letter-spacing: -.055em; }
.hero-intro { max-width: 720px; margin: 2rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 1.6vw, 1.3rem); line-height: 1.65; }
.hero-actions, .contact-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; margin-top: 2.2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-height: 48px; padding: .72rem 1.15rem; border: 1px solid transparent; font-size: .92rem; font-weight: 800; text-decoration: none; }
.button-primary { color: var(--navy); background: var(--aqua); }
.button-primary:hover, .button-primary:focus-visible { background: #72e4d7; }
.button-secondary { border-color: var(--line); background: rgba(255,255,255,.55); }
.button-secondary:hover, .button-secondary:focus-visible { border-color: var(--aqua-dark); }
.hero-panel { position: relative; padding: 2.1rem; color: var(--white); background: var(--navy); box-shadow: 28px 28px 0 var(--soft-aqua); }
.signal-lines { display: flex; align-items: flex-end; gap: 6px; height: 35px; margin-bottom: 2rem; }
.signal-lines i { display: block; width: 4px; background: var(--aqua); }
.signal-lines i:nth-child(1) { height: 35%; }.signal-lines i:nth-child(2) { height: 100%; }.signal-lines i:nth-child(3) { height: 65%; }
.panel-label { margin: 0; color: #91a8b7; font-size: .72rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.focus-list { list-style: none; padding: 0; margin: 1rem 0 2rem; }
.focus-list li { display: grid; grid-template-columns: 2.2rem 1fr; gap: .6rem; padding: .9rem 0; border-bottom: 1px solid rgba(255,255,255,.12); font-weight: 650; line-height: 1.4; }
.focus-list span { color: var(--aqua); font-size: .76rem; }
.location { margin: 0; color: #9eb0ba; font-size: .88rem; }

.section { padding-block: clamp(5rem, 9vw, 8.5rem); }
.section-heading { max-width: 790px; margin-bottom: 3rem; }
.section-heading h2, .contact-section h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.25rem, 4.7vw, 4.3rem); font-weight: 400; line-height: 1.08; letter-spacing: -.045em; }
.expertise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.expertise-card { display: flex; flex-direction: column; min-height: 370px; padding: 1.8rem; border: 1px solid var(--line); background: rgba(255,255,255,.5); }
.expertise-card.featured-card { color: var(--white); background: var(--navy-2); border-color: var(--navy-2); transform: translateY(-1.25rem); }
.card-index { color: var(--aqua-dark); font-size: .76rem; font-weight: 850; }
.featured-card .card-index { color: var(--aqua); }
.expertise-card h3 { margin: auto 0 .7rem; font-size: 1.42rem; letter-spacing: -.025em; }
.expertise-card p { margin: 0 0 1.5rem; color: var(--muted); }
.featured-card p { color: #c7d6de; }
.tag-list { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; padding: 1.2rem 0 0; margin: 0; border-top: 1px solid var(--line); }
.featured-card .tag-list { border-color: rgba(255,255,255,.14); }
.tag-list li { padding: .25rem .55rem; background: var(--soft-aqua); color: var(--aqua-dark); font-size: .72rem; font-weight: 800; }
.featured-card .tag-list li { background: rgba(85,212,197,.12); color: var(--aqua); }

.frameworks-section { padding-block: clamp(4rem, 7vw, 6.5rem); color: var(--white); background: var(--navy-2); }
.frameworks-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2.5rem, 7vw, 7rem); align-items: center; }
.frameworks-layout h2 { max-width: 520px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.2rem, 4.4vw, 4rem); font-weight: 400; line-height: 1.08; letter-spacing: -.045em; }
.frameworks-layout .eyebrow { color: var(--aqua); }
.framework-card { padding: clamp(1.6rem, 4vw, 2.7rem); border-left: 4px solid var(--aqua); background: rgba(255,255,255,.06); }
.framework-kicker { margin: 0 0 .35rem; color: var(--aqua); font-size: .76rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.framework-card h3 { margin: 0 0 .75rem; font-size: clamp(1.6rem, 3vw, 2.35rem); letter-spacing: -.03em; }
.framework-card > p:last-of-type { margin: 0; color: #c7d6de; }
.framework-list { display: flex; flex-wrap: wrap; gap: .55rem; list-style: none; padding: 1.4rem 0 0; margin: 1.4rem 0 0; border-top: 1px solid rgba(255,255,255,.14); }
.framework-list li { padding: .3rem .65rem; color: var(--aqua); background: rgba(85,212,197,.12); font-size: .75rem; font-weight: 800; }

.section-dark { color: var(--white); background: var(--navy); }
.section-heading-light h2 { max-width: 850px; }
.section-heading-light .eyebrow { color: var(--aqua); }
.timeline { border-top: 1px solid rgba(255,255,255,.16); }
.timeline-item { display: grid; grid-template-columns: minmax(180px, .38fr) 1fr; gap: 3rem; padding: 2.4rem 0; border-bottom: 1px solid rgba(255,255,255,.16); }
.timeline-meta { display: flex; flex-direction: column; gap: .35rem; color: #8fa6b4; font-size: .86rem; }
.timeline-meta time { color: var(--aqua); font-size: 1.05rem; font-weight: 850; }
.timeline-body h3 { margin: 0; font-size: 1.45rem; letter-spacing: -.02em; }
.organization { margin: .15rem 0 .8rem; color: var(--aqua); font-weight: 700; }
.timeline-body > p:last-child { max-width: 760px; margin-bottom: 0; color: #bfd0d8; }

.split-heading { display: grid; grid-template-columns: 1.35fr .65fr; gap: 4rem; max-width: none; align-items: end; }
.split-heading > p { max-width: 430px; margin: 0; color: var(--muted); }
.publication-list { border-top: 1px solid var(--line); }
.publication { display: grid; grid-template-columns: 85px 1fr 30px; gap: 1.5rem; align-items: center; padding: 1.55rem .2rem; border-bottom: 1px solid var(--line); text-decoration: none; }
.publication:hover, .publication:focus-visible { background: var(--soft-aqua); padding-inline: 1rem; }
.pub-year { color: var(--aqua-dark); font-weight: 850; }
.pub-title { display: flex; flex-direction: column; gap: .25rem; line-height: 1.35; }
.pub-title strong { font-size: 1.03rem; }.pub-title small { color: var(--muted); font-size: .82rem; }
.pub-arrow { color: var(--aqua-dark); font-size: 1.2rem; }

.section-muted { background: #e9eeee; }
.education-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(3rem, 8vw, 8rem); }
.degree-list { border-top: 1px solid var(--line); }
.degree-list article { padding: 1.6rem 0; border-bottom: 1px solid var(--line); }
.degree-list span { color: var(--aqua-dark); font-size: .78rem; font-weight: 850; }
.degree-list h3 { margin: .35rem 0 .15rem; font-size: 1.15rem; }.degree-list p { margin: 0; color: var(--muted); }
.contact-section { padding-block: clamp(6rem, 12vw, 11rem); text-align: center; }
.contact-section h2 { max-width: 900px; margin-inline: auto; }
.contact-section > p:not(.eyebrow) { max-width: 650px; margin: 1.5rem auto 0; color: var(--muted); font-size: 1.1rem; }
.contact-actions { justify-content: center; }
.text-link { padding: .75rem; color: var(--aqua-dark); font-weight: 800; text-underline-offset: 4px; }
.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding-block: 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.site-footer p { margin: 0; }

@media (max-width: 850px) {
  .menu-button { display: block; }
  .primary-nav { display: none; position: absolute; top: 78px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: .7rem 1.5rem 1.2rem; background: var(--navy); border-bottom: 1px solid rgba(255,255,255,.12); }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: .75rem 0; }
  .primary-nav .nav-contact { padding-inline: .75rem; text-align: center; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero h1 { font-size: clamp(3.2rem, 13vw, 5.7rem); }
  .hero-panel { max-width: 580px; }
  .expertise-grid { grid-template-columns: 1fr; }
  .expertise-card { min-height: 300px; }
  .expertise-card.featured-card { transform: none; }
  .split-heading, .education-layout, .frameworks-layout { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 560px) {
  .section-shell { width: min(calc(100% - 2rem), var(--max)); }
  .site-header { min-height: 68px; padding-inline: 1rem; }
  .brand span:last-child { display: none; }
  .primary-nav { top: 68px; }
  .hero { padding-block: 4.5rem 5.5rem; }
  .hero h1 { font-size: clamp(2.9rem, 15vw, 4.2rem); }
  .hero-actions .button { width: 100%; }
  .hero-panel { padding: 1.5rem; box-shadow: 14px 14px 0 var(--soft-aqua); }
  .timeline-item { grid-template-columns: 1fr; gap: 1.1rem; }
  .publication { grid-template-columns: 60px 1fr 18px; gap: .75rem; }
  .site-footer { flex-direction: column; }
}

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