/* ============ Tokens ============ */
:root {
  --bg: #FAFAFA;
  --ink: #0A0A0A;
  --muted: #6B6B6B;
  --faint: #9B9B9B;
  --line: rgba(10, 10, 10, 0.10);
  --line-strong: rgba(10, 10, 10, 0.18);
  --surface-hover: rgba(10, 10, 10, 0.035);

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

  --nav-w: 220px;
  --content-max: 640px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"] {
  --bg: #0A0A0A;
  --ink: #F2F2F0;
  --muted: #9A9A9A;
  --faint: #6E6E6E;
  --line: rgba(255, 255, 255, 0.10);
  --line-strong: rgba(255, 255, 255, 0.18);
  --surface-hover: rgba(255, 255, 255, 0.04);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; }
p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }

::selection {
  background: var(--ink);
  color: var(--bg);
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ============ Theme toggle ============ */
.theme-toggle {
  position: fixed;
  top: 24px;
  right: 28px;
  z-index: 100;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  cursor: pointer;
  transition: border-color var(--transition), transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  transform: scale(1.06);
}

.theme-toggle svg circle,
.theme-toggle svg path {
  transition: all var(--transition);
}

html[data-theme="dark"] .theme-toggle svg path {
  opacity: 0;
}

html[data-theme="dark"] .theme-toggle svg circle {
  r: 6.5;
}

/* ============ Sidenav ============ */
.sidenav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  border-right: 1px solid var(--line);
  z-index: 90;
}

.sidenav-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 28px;
}

.mark {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.02em;
}

.sidenav ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.navlink {
  display: block;
  padding: 7px 0;
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.01em;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.navlink:hover {
  color: var(--ink);
  padding-left: 4px;
}

.sidenav-cta {
  font-size: 13px;
  color: var(--faint);
  border-top: 1px solid var(--line);
  padding-top: 18px;
  transition: color 0.2s ease;
}

.sidenav-cta:hover { color: var(--ink); }

/* ============ Layout ============ */
main {
  margin-left: var(--nav-w);
  padding: 0 64px;
}

section.block, .hero {
  max-width: var(--content-max);
}

/* ============ Hero ============ */
.hero {
  padding: 120px 0 96px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 76px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.01em;
}

.role {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--muted);
  margin-top: 14px;
}

.hero-sub {
  margin-top: 28px;
  font-size: 16px;
  color: var(--muted);
  max-width: 480px;
  line-height: 1.7;
}

.hero-links {
  margin-top: 40px;
  display: flex;
  gap: 14px;
}

.btn-primary, .btn-ghost {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  padding: 12px 22px;
  border-radius: 100px;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--bg);
}

.btn-primary:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
}

/* ============ Blocks ============ */
.block {
  padding: 88px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 40px;
}

.block-head {
  margin-bottom: 40px;
}

.block-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}

.block-body p {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  max-width: 560px;
}

.block-body p + p {
  margin-top: 18px;
}

/* ============ Timeline (signature element) ============ */
.timeline {
  display: flex;
  flex-direction: column;
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 36px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.timeline-item:first-child {
  border-top: none;
}

.timeline-year {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  white-space: nowrap;
}

.year-suffix {
  display: block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  color: var(--faint);
  letter-spacing: 0.03em;
  margin-top: 4px;
}

.timeline-content h3 {
  font-size: 18px;
  font-weight: 600;
}

.timeline-org {
  font-size: 14px;
  color: var(--faint);
  margin-top: 3px;
}

.timeline-content p:last-child {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
  max-width: 440px;
}

/* ============ Work list ============ */
.worklist {
  display: flex;
  flex-direction: column;
}

.workrow {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  padding: 30px 20px;
  margin: 0 -20px;
  border-top: 1px solid var(--line);
  border-radius: 6px;
  transition: background 0.2s ease, padding-left 0.2s ease;
}

.worklist a:first-child { border-top: none; }

.workrow:hover {
  background: var(--surface-hover);
  padding-left: 28px;
}

.workrow-main h3 {
  font-size: 18px;
  font-weight: 600;
}

.workrow-main p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--muted);
  max-width: 420px;
  line-height: 1.7;
}

.workrow-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  font-size: 13px;
  color: var(--faint);
  white-space: nowrap;
  padding-top: 3px;
}

/* ============ Skills ============ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.skill-group h4 {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}

.skill-group p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.7;
}

/* ============ Contact ============ */
.contact-lead {
  max-width: 480px;
}

.contact-links {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-link {
  font-family: var(--font-display);
  font-size: 22px;
  padding: 10px 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  width: fit-content;
}

.contact-link:hover {
  opacity: 0.6;
  transform: translateX(4px);
}

.contact-block {
  border-bottom: none;
}

/* ============ Footer ============ */
.site-footer {
  margin-left: var(--nav-w);
  padding: 32px 64px 48px;
}

.site-footer p {
  font-size: 13px;
  color: var(--faint);
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  :root { --nav-w: 0px; }

  .sidenav {
    width: 100%;
    height: auto;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 90;
  }

  .sidenav-inner {
    flex-direction: row;
    align-items: center;
    padding: 18px 24px;
  }

  .sidenav ul {
    flex-direction: row;
    gap: 18px;
  }

  .sidenav-cta {
    display: none;
  }

  main, .site-footer {
    margin-left: 0;
    padding-left: 24px;
    padding-right: 24px;
  }

  .hero {
    padding: 56px 0 64px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .timeline-year {
    font-size: 26px;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .workrow {
    flex-direction: column;
    gap: 12px;
  }

  .workrow-meta {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .theme-toggle {
    top: 16px;
    right: 16px;
  }
}

@media (max-width: 520px) {
  .sidenav ul {
    display: none;
  }
  .sidenav-inner {
    justify-content: space-between;
  }
}