/* ==========================================================================
   Tokens
   ========================================================================== */
:root {
  --mist: #fcf9f2;
  --coal: #231f20;
  --cacao: #603620;
  --moss: #63703d;
  --meadow: #b5c37c;
  --meadow-pale: #e5ecd2;
  --meadow-deep-text: #2f3a17;
  --meadow-mid-text: #3f4a29;
  --hairline: #e2e6d5;
  --text-muted: #6f6f5f;
  --text-faint: #8a8a75;
  --tint-bg: #f2f4e9;

  --font-display: 'Fraunces', serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-width: 720px;
}

/* ==========================================================================
   Reset + base
   ========================================================================== */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--mist);
  color: var(--coal);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

h2 { margin: 0; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--coal);
  color: var(--mist);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
}

:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  border-bottom: 1px solid var(--hairline);
  padding: 20px 30px;
}

.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}

.identity {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--moss);
  flex-shrink: 0;
}

.identity-text {
  display: flex;
  flex-direction: column;
}

.name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--coal);
  line-height: 1.2;
}

.socials {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}

.socials a {
  color: var(--moss);
  font-size: 15px;
  line-height: 1;
  transition: opacity 0.15s ease;
}

.socials a:hover { opacity: 0.7; }

.main-nav ul {
  display: flex;
  gap: 18px;
  font-size: 13px;
  padding-top: 4px;
}

.main-nav a {
  color: var(--coal);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--moss);
  border-bottom-color: var(--moss);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--coal);
  cursor: pointer;
  padding: 4px;
}

/* ==========================================================================
   Section layout
   ========================================================================== */
.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 30px;
}

.section-tint {
  max-width: none;
  background: var(--tint-bg);
}

.section-tint > * {
  max-width: 940px;
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: 16px;
}

/* ==========================================================================
   About
   ========================================================================== */
.about {
  max-width: 900px;
  padding-top: 32px;
}

.experience {
  border-top: 1px solid var(--hairline);
  padding-top: 40px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
  margin-left: 110px;
}

.tags li {
  font-size: 10px;
  padding: 3px 8px;
  background: var(--meadow);
  color: var(--meadow-deep-text);
  border-radius: 2px;
  font-family: var(--font-mono);
}

.about-content {
  display: flex;
  align-items: flex-start;
  gap: 24px;
}

.about-image {
  width: 220px;
  height: auto;
  border-radius: 8px;
  flex-shrink: 0;
  margin-left: -140px;
  margin-right: 8px;
}

.intro {
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.75;
  color: var(--coal);
  margin: 0;
}

.intro a {
  color: var(--moss);
  border-bottom: 1px solid var(--moss);
}

/* ==========================================================================
   Experience timeline
   ========================================================================== */
.timeline {
  max-width: var(--max-width);
}

.timeline li {
  display: flex;
  gap: 16px;
  padding-bottom: 18px;
}

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

.timeline-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  width: 78px;
  flex-shrink: 0;
  padding-top: 2px;
}

.timeline-content {
  border-left: 2px solid var(--hairline);
  padding-left: 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.timeline li:first-child .timeline-content {
  border-left-color: var(--meadow);
}

.timeline-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--coal);
}

.timeline-sub {
  font-size: 12px;
  color: var(--text-faint);
}

/* ==========================================================================
   Research list
   ========================================================================== */
.research-visual {
  width: 100%;
  max-width: none;
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

.research-image {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.research-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}

.research-list li:last-child { border-bottom: none; }

.research-main {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.research-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--coal);
}

.research-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.research-meta {
  font-size: 11px;
  color: var(--moss);
  font-family: var(--font-mono);
  flex-shrink: 0;
  white-space: nowrap;
}

/* ==========================================================================
   Publications
   ========================================================================== */
.pub-list {
  max-width: var(--max-width);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.pub-title {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--coal);
  margin-bottom: 4px;
}

.pub-title:hover,
.pub-title:focus-visible {
  color: var(--moss);
}

.pub-meta {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.project-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  border-radius: 8px;
  padding: 16px;
  min-height: 120px;
  background: var(--meadow-pale);
  transition: transform 0.15s ease;
}

.project-card:hover,
.project-card:focus-visible {
  transform: translateY(-2px);
}

.project-image {
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 220px;
  border-radius: 8px;
  background: #fff;
  object-fit: contain;
  flex-shrink: 0;
}

.project-card-emergency .project-image {
  background: #bbe4ff;
}

.project-card-viz .project-image {
  background: #000;
}

.project-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}

.project-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--meadow-deep-text);
}

.project-desc {
  font-size: 12px;
  line-height: 1.5;
  color: var(--meadow-mid-text);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 24px 30px 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--moss);
  border-bottom: 1px solid var(--moss);
}

.footer-note {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 6px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    gap: 12px;
  }

  .nav-toggle {
    display: block;
    position: absolute;
    top: 20px;
    right: 30px;
  }

  .main-nav ul {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding-top: 16px;
    width: 100%;
  }

  .main-nav.open ul {
    display: flex;
  }

  .site-header {
    position: relative;
  }

  .research-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}