/* ===== Tokens ===== */
:root {
  --navy-900: #0a1c30;
  --navy-800: #0f2c4c;
  --navy-700: #163d68;
  --ink: #16212e;
  --body: #4a5a6b;
  --muted: #7b8a99;
  --line: #e2e8ef;
  --bg: #ffffff;
  --bg-alt: #f5f8fb;
  --accent: #0f8f8a;
  --accent-soft: #e6f4f3;

  --wrap: 1120px;
  --radius: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 33, 51, .06), 0 4px 12px rgba(16, 33, 51, .05);
  --shadow-md: 0 6px 28px rgba(16, 33, 51, .10);
  --header-h: 68px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { color: var(--ink); line-height: 1.2; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0; padding: 0; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--navy-800); color: #fff; padding: 12px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, box-shadow .25s;
}
.site-header.scrolled { border-bottom-color: var(--line); box-shadow: var(--shadow-sm); }

.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
}

.brand {
  font-family: "Fraunces", Georgia, serif;
  font-size: 22px; letter-spacing: .06em;
  color: var(--navy-800); text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--body); font-size: 15px; font-weight: 500;
  padding: 8px 12px; border-radius: 8px; text-decoration: none;
  transition: color .2s, background .2s;
}
.nav a:hover { color: var(--navy-800); background: var(--bg-alt); text-decoration: none; }
.nav a.active { color: var(--accent); }

.nav .nav-cta {
  margin-left: 8px; background: var(--navy-800); color: #fff;
}
.nav .nav-cta:hover { background: var(--navy-700); color: #fff; }

.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer;
  width: 44px; height: 44px; padding: 10px; border-radius: 8px;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--navy-800); border-radius: 2px;
  margin: 5px 0; transition: transform .25s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, #fdfefe 0%, var(--bg-alt) 100%);
  border-bottom: 1px solid var(--line);
  padding: 84px 0 92px;
}
/* Soft drifting colour blobs behind the hero */
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%;
  filter: blur(70px); z-index: 0; pointer-events: none;
}
.hero::before {
  width: 460px; height: 460px; top: -120px; right: -90px;
  background: radial-gradient(circle, rgba(15, 143, 138, .28), transparent 70%);
  animation: drift 15s ease-in-out infinite;
}
.hero::after {
  width: 380px; height: 380px; bottom: -140px; left: -110px;
  background: radial-gradient(circle, rgba(111, 220, 214, .24), transparent 70%);
  animation: drift2 19s ease-in-out infinite;
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.35fr .9fr; gap: 56px; align-items: center;
}

.eyebrow {
  text-transform: uppercase; letter-spacing: .14em; font-size: 12px; font-weight: 600;
  color: var(--accent); margin-bottom: 18px;
}

.hero h1 {
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(42px, 6vw, 68px);
  letter-spacing: -.02em; color: var(--navy-900); margin-bottom: 20px;
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--accent), #6fdcd6, var(--navy-700), var(--accent));
  background-size: 200% auto;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  animation: shimmer 7s linear infinite;
}

.lede { font-size: 19px; max-width: 56ch; color: var(--body); }
.lede strong { color: var(--ink); font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }

.btn {
  display: inline-block; padding: 13px 26px; border-radius: 10px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  transition: transform .18s, box-shadow .18s, background .2s, color .2s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--navy-800); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--navy-700); color: #fff; box-shadow: var(--shadow-md); }
.btn-ghost { border: 1px solid var(--line); background: #fff; color: var(--navy-800); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-links { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 15px; }
.hero-links a { color: var(--body); border-bottom: 1px solid var(--line); padding-bottom: 2px; }
.hero-links a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.hero-aside { display: flex; flex-direction: column; gap: 30px; align-items: center; }

/* Circular photo with a slowly rotating gradient ring and gentle float */
.hero-photo {
  position: relative; margin: 0;
  width: min(320px, 80%); aspect-ratio: 1; border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}
.hero-photo::before {
  content: ""; position: absolute; inset: -12px; border-radius: 50%; z-index: 0;
  background: conic-gradient(from 0deg, var(--accent), #6fdcd6, var(--navy-700), var(--accent));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 12px), #000 calc(100% - 12px));
          mask: radial-gradient(farthest-side, transparent calc(100% - 12px), #000 calc(100% - 12px));
  animation: spin 9s linear infinite;
}
.hero-photo-img,
.hero-photo-fallback {
  position: absolute; inset: 0; width: 100%; height: 100%;
  border-radius: 50%; object-fit: cover; display: block; z-index: 1;
  box-shadow: 0 14px 36px rgba(16, 33, 51, .22);
}
.hero-photo-fallback {
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--accent-soft), #eef3f8);
  font-family: "Fraunces", Georgia, serif; font-size: 60px; letter-spacing: .08em;
  color: #9fc4c1; user-select: none;
}
/* Fallback text hides once a real photo loads; shows if photo.jpg is missing. */
.hero-photo-img + .hero-photo-fallback { display: none; }
.hero-photo.is-empty .hero-photo-fallback { display: flex; }

.hero-card {
  width: 100%;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-md); padding: 12px 28px;
}
.stat { padding: 18px 0; border-bottom: 1px solid var(--line); }
.stat:last-child { border-bottom: 0; }
.stat-num {
  display: block; font-family: "Fraunces", Georgia, serif;
  font-size: 34px; color: var(--navy-800); line-height: 1.1;
}
.stat-lbl { display: block; font-size: 14px; color: var(--muted); margin-top: 2px; }

/* ===== Sections ===== */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-title {
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(28px, 3.6vw, 38px);
  color: var(--navy-900); margin-bottom: 40px;
  display: flex; align-items: baseline; gap: 14px;
}
.section-title { position: relative; }
.section-title .num {
  font-family: "Inter", sans-serif; font-size: 13px; font-weight: 700;
  letter-spacing: .12em; color: var(--accent);
}
/* Accent underline that draws itself when the section scrolls into view */
.section-title::after {
  content: ""; position: absolute; left: 0; bottom: -12px;
  width: 66px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), #6fdcd6);
  transform: scaleX(0); transform-origin: left;
  transition: transform .7s cubic-bezier(.2, .7, .2, 1) .1s;
}
.wrap.visible .section-title::after { transform: scaleX(1); }
.section-title.light { color: #fff; }
.section-title.light .num { color: #6fdcd6; }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; }
.about-lead {
  font-family: "Fraunces", Georgia, serif; font-size: 24px; line-height: 1.4;
  color: var(--navy-800);
}
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.chips li {
  background: var(--accent-soft); color: #0b6763;
  font-size: 13px; font-weight: 600; padding: 6px 14px; border-radius: 999px;
}

/* ===== Cards ===== */
.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px;
}
.cards-2 { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 26px 22px; box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: #cfdbe6; }
.card h3 { font-size: 17px; font-weight: 600; margin-bottom: 14px; }

.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 7px; }
.tags li {
  font-size: 13px; color: var(--body); background: var(--bg-alt);
  border: 1px solid var(--line); padding: 5px 11px; border-radius: 7px;
}

.list { list-style: none; }
.list li {
  position: relative; padding-left: 20px; margin-bottom: 10px; font-size: 15px;
}
.list li::before {
  content: ""; position: absolute; left: 0; top: 10px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

.edu h3 { color: var(--navy-800); }
.edu-school { margin-bottom: 4px; font-size: 15px; }
.edu-gpa { margin: 0; font-size: 14px; font-weight: 600; color: var(--accent); }

/* ===== Timeline ===== */
.timeline { position: relative; }
.tl-item {
  display: grid; grid-template-columns: 260px 1fr; gap: 32px;
  padding: 30px 0 30px 0; border-top: 1px solid var(--line);
}
.tl-item:first-child { border-top: 0; padding-top: 0; }

.tl-meta { display: flex; flex-direction: column; gap: 4px; }
.tl-date {
  font-size: 13px; font-weight: 700; letter-spacing: .06em;
  text-transform: uppercase; color: var(--accent);
}
.tl-org { font-size: 15px; color: var(--muted); }

.tl-body h3 { font-size: 21px; font-weight: 600; margin-bottom: 12px; }
.tl-body ul { list-style: none; }
.tl-body li {
  position: relative; padding-left: 22px; margin-bottom: 9px; font-size: 15.5px;
}
.tl-body li::before {
  content: ""; position: absolute; left: 0; top: 11px;
  width: 8px; height: 1.5px; background: var(--accent);
}

/* ===== Publications ===== */
.pubs { list-style: none; counter-reset: pub; }
.pubs li {
  border-left: 3px solid var(--accent); background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px; margin-bottom: 16px;
}
.pub-year, .pub-status {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 6px;
}
.pub-status { color: #a9670c; }
.pub-title { font-size: 17px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.pub-cite { font-size: 14.5px; color: var(--muted); margin: 0; }
.pub-more { margin-top: 22px; font-size: 15px; }

/* ===== Projects ===== */
.project .proj-tool {
  font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px;
}
.project h3 { font-size: 20px; margin-bottom: 2px; }
.project .proj-sub { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.project ul { list-style: none; }
.project li {
  position: relative; padding-left: 20px; margin-bottom: 9px; font-size: 15px;
}
.project li::before {
  content: ""; position: absolute; left: 0; top: 10px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

/* ===== Contact ===== */
.contact {
  background:
    radial-gradient(700px 340px at 15% 0%, rgba(15, 143, 138, .26), transparent 60%),
    var(--navy-900);
  color: #c6d4e2;
}
.contact-lead { font-size: 19px; color: #d7e3ee; max-width: 56ch; margin-bottom: 34px; }

.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px;
}
.contact-card {
  display: block; padding: 22px 24px; border-radius: var(--radius);
  background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .12);
  color: #fff; text-decoration: none;
  transition: background .2s, border-color .2s, transform .2s;
}
.contact-card:hover {
  background: rgba(255, 255, 255, .1); border-color: #4fd1c5;
  transform: translateY(-3px); text-decoration: none;
}
.c-label {
  display: block; font-size: 12px; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: #6fdcd6; margin-bottom: 6px;
}
.c-value { display: block; font-size: 15.5px; word-break: break-word; }

.refs { margin-top: 28px; font-size: 14px; color: #8fa4b8; }

/* ===== Footer ===== */
.site-footer { background: #06121f; color: #7f93a8; padding: 26px 0; }
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px; font-size: 14px;
}
.site-footer p { margin: 0; }
.site-footer a { color: #7f93a8; }
.site-footer a:hover { color: #4fd1c5; text-decoration: none; }

/* ===== Reveal + motion ===== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Individual items that fade + rise in sequence (delay set inline by JS) */
.reveal-item { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal-item.visible { opacity: 1; transform: none; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes shimmer { to { background-position: 200% center; } }
@keyframes drift { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(-36px, 34px); } }
@keyframes drift2 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(30px, -34px); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-item { opacity: 1; transform: none; transition: none; }
  .section-title::after { transform: scaleX(1); }
  .hero-photo, .hero-photo::before, .hero::before, .hero::after, .hero h1 .accent {
    animation: none;
  }
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* ===== Responsive ===== */
@media (max-width: 940px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .tl-item { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 780px) {
  body { font-size: 16px; }
  .section { padding: 64px 0; }
  .hero { padding: 60px 0 68px; }

  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md); padding: 8px 16px 16px;
    transform: translateY(-120%); opacity: 0; pointer-events: none;
    transition: transform .28s ease, opacity .2s ease;
  }
  .nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav a { padding: 14px 8px; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav a:last-child { border-bottom: 0; }
  .nav .nav-cta { margin: 12px 0 0; text-align: center; border-radius: 10px; }
}

/* ===== Print ===== */
@media print {
  .site-header, .nav-toggle, .hero-actions, .site-footer { display: none; }
  body { font-size: 11pt; color: #000; }
  .section, .hero { padding: 16px 0; break-inside: avoid; }
  .card, .tl-item, .pubs li { break-inside: avoid; box-shadow: none; }
  .contact { background: #fff; color: #000; }
  .contact .section-title.light, .contact-lead, .c-value { color: #000; }
}