/* ============ Design tokens ============ */
:root {
  --navy: #142439;
  --navy-soft: #1f3550;
  --teal: #078d96;
  --teal-light: #e8f1f6;
  --gray: #58708a;
  --gray-light: #f7f9fc;
  --line: #d8e2ec;
  --white: #ffffff;
  --cream: #faf8f3;
  --gold: #c08a3e;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --max-w: 1120px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--navy);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0; }

a { color: inherit; text-decoration: none; }

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

.noise-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 10%, rgba(7,141,150,0.06), transparent 40%),
    radial-gradient(circle at 85% 0%, rgba(192,138,62,0.05), transparent 35%);
}

/* ============ Header / nav ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 30px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--navy-soft);
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--teal); }

.nav-cta {
  background: var(--navy);
  color: var(--white) !important;
  padding: 9px 18px;
  border-radius: 100px;
}
.nav-cta:hover { background: var(--teal) !important; color: var(--white) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px; height: 2px; background: var(--navy); border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}

/* ============ Hero ============ */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 92px 28px 72px;
}

.hero-inner { max-width: 760px; }

.eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  letter-spacing: -0.02em;
  line-height: 1.02;
  margin-bottom: 20px;
}

.hero-tagline {
  font-size: 1.18rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 0 28px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}

.tag {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--navy-soft);
  background: var(--teal-light);
  border: 1px solid var(--line);
  padding: 7px 14px;
  border-radius: 100px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 26px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all .15s ease;
  border: 1px solid transparent;
}
.btn-primary { background: var(--navy); color: var(--white); }
.btn-primary:hover { background: var(--teal); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); }
.btn-sm { padding: 9px 18px; font-size: 0.85rem; }

/* ============ Sections ============ */
.section { padding: 86px 0; }
.section-alt { background: var(--gray-light); }

.section-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }
.section-inner.narrow { max-width: 820px; }

.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-title .num {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.05em;
}

.section-sub {
  color: var(--gray);
  font-size: 1.02rem;
  max-width: 640px;
  margin-bottom: 44px;
}

.lede { font-size: 1.08rem; color: var(--navy-soft); margin-bottom: 20px; }
.lede em { color: var(--teal); font-style: normal; font-weight: 600; }

/* ============ Publications ============ */
.pub-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 10px;
}

.pub-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pub-featured { grid-column: span 1; background: var(--white); box-shadow: 0 2px 18px rgba(20,36,57,0.05); }

.pub-status {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: 100px;
  display: inline-block;
  width: fit-content;
}
.status-published { background: #e4f4e6; color: #1f7a3d; }
.status-progress   { background: var(--teal-light); color: var(--teal); }
.status-review     { background: #fdf1e0; color: var(--gold); }
.status-award      { background: #f1ecfb; color: #6b4fbb; }

.pub-card h3 {
  font-size: 1.12rem;
  line-height: 1.32;
  letter-spacing: -0.005em;
}

.pub-card p { color: var(--gray); font-size: 0.95rem; margin: 0; }

.pub-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--teal);
  margin-top: 4px;
}
.pub-link:hover { text-decoration: underline; }

/* ============ Timeline ============ */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--line);
}

.timeline-item {
  position: relative;
  padding: 0 0 40px 32px;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--teal);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 1px var(--teal);
}

.tl-date {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}

.tl-body h3 { font-size: 1.08rem; margin-bottom: 8px; line-height: 1.3; }
.tl-body p { color: var(--gray); font-size: 0.95rem; margin: 0; }
.tl-body em { color: var(--navy-soft); font-style: normal; font-weight: 600; }

/* ============ Impact ============ */
.impact-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px;
}
.impact-card h3 { font-size: 1.3rem; margin-bottom: 18px; }
.impact-stat {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  color: var(--teal);
  margin: 0;
  line-height: 1;
}
.impact-stat span { color: var(--gold); }
.impact-stat-label {
  color: var(--gray);
  font-size: 0.92rem;
  max-width: 420px;
  margin: 10px 0 24px;
}
.impact-card > p { color: var(--navy-soft); margin-bottom: 18px; }
.impact-links { margin-bottom: 18px; }
.impact-footnote {
  font-size: 0.88rem;
  color: var(--gray);
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin: 0;
}

/* ============ Apps ============ */
.app-card {
  background: var(--teal-light);
  border-radius: var(--radius);
  padding: 36px;
}
.app-card h3 { font-size: 1.25rem; margin-bottom: 12px; }
.app-card p { color: var(--navy-soft); margin-bottom: 20px; }

/* ============ Honors / grid ============ */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.subhead {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin-bottom: 16px;
  margin-top: 32px;
}
.subhead:first-child { margin-top: 0; }

.plain-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}
.plain-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.94rem;
  color: var(--navy-soft);
}
.plain-list li:last-child { border-bottom: none; }

.edu-item { margin-bottom: 24px; }
.edu-school { font-weight: 700; font-size: 1.02rem; margin: 0 0 3px; }
.edu-meta { font-size: 0.86rem; color: var(--teal); font-weight: 600; margin: 0 0 8px; }
.edu-detail { font-size: 0.92rem; color: var(--gray); margin: 0; }

/* ============ Contact ============ */
.contact { text-align: left; }
.contact-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 8px; }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 28px;
  text-align: center;
  color: var(--gray);
  font-size: 0.85rem;
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .pub-list { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 28px 20px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform .25s ease, opacity .25s ease;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-links li { width: 100%; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links li:last-child { border-bottom: none; padding-top: 18px; }
  .nav-cta { display: inline-block; }
  .nav-toggle { display: flex; }
  .hero { padding: 56px 22px 48px; }
  .section { padding: 60px 0; }
  .section-inner { padding: 0 22px; }
}