/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  color-scheme: light;
  --bg: #f7f6f2;
  --surface: #fffefa;
  --surface-2: #eeede7;
  --text: #1b282b;
  --text-muted: #526064;
  --border: #d8d8d1;
  --accent: #12665f;
  --accent-contrast: #ffffff;
  --focus: #155eef;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step--1: clamp(0.82rem, 0.79rem + 0.12vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.08rem + 0.65vw, 1.55rem);
  --step-2: clamp(1.6rem, 1.3rem + 1.35vw, 2.35rem);
  --step-3: clamp(2.15rem, 1.6rem + 2.8vw, 3.75rem);
  --step-4: clamp(3rem, 1.8rem + 5vw, 5.75rem);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.25rem;
  --space-5: 3.5rem;
  --space-6: clamp(4.5rem, 3.5rem + 5vw, 7.5rem);

  --radius: 12px;
  --container: 76rem;
  --measure: 62ch;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 1px 2px rgb(27 40 43 / 0.04), 0 16px 40px -20px rgb(27 40 43 / 0.24);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #141c1d;
    --surface: #1b2526;
    --surface-2: #263233;
    --text: #f2f0e9;
    --text-muted: #bcc5c0;
    --border: #3b4949;
    --accent: #8bd0be;
    --accent-contrast: #13201f;
    --focus: #a6c8ff;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.28), 0 16px 40px -20px rgb(0 0 0 / 0.65);
  }
}

/* ==========================================================================
   Base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 var(--space-2); text-wrap: balance; }
h1, h2 { font-family: var(--font-display); font-weight: 500; }
h1 { font-size: var(--step-4); letter-spacing: -0.045em; }
h2 { font-size: var(--step-3); letter-spacing: -0.035em; }
h3 { font-size: var(--step-1); }
p { margin: 0 0 var(--space-2); max-width: var(--measure); text-wrap: pretty; }
a { color: inherit; text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
ul, ol { padding: 0; margin: 0; list-style: none; }

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

.skip-link {
  position: absolute; left: var(--space-2); top: -4rem; z-index: 100;
  padding: 0.75rem 1rem; background: var(--text); color: var(--bg); border-radius: 8px;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: var(--space-2); }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container { width: min(100% - 2.5rem, var(--container)); margin-inline: auto; }
.section { padding-block: var(--space-6); }
.section + .section { border-top: 1px solid var(--border); }
.section__head { margin-bottom: var(--space-4); }
.section__head--row { display: flex; align-items: end; justify-content: space-between; gap: var(--space-3); }
.section__head--row h2 { max-width: 17ch; margin-bottom: 0; }
.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }
.stack > * + * { margin-top: var(--space-2); }
.eyebrow {
  display: inline-block; margin-bottom: var(--space-2);
  font: 500 var(--step--1)/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent);
}
.lead { font-size: var(--step-1); color: var(--text-muted); line-height: 1.5; }
.text-link { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 650; text-decoration-thickness: 1px; text-underline-offset: 0.25em; }
.text-link span { transition: transform 0.2s var(--ease); }
.text-link:hover span { transform: translate(0.15rem, -0.1rem); }
.section--soft { background: var(--surface-2); }

/* ==========================================================================
   Header / navigation
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.site-header.is-scrolled { border-bottom-color: var(--border); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 4rem; gap: var(--space-2); }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 650; text-decoration: none; letter-spacing: -0.01em; }
.brand__mark { width: 1.2rem; height: 1.2rem; border-radius: 50%; background: var(--accent); box-shadow: inset 0 0 0 3px var(--bg), 0 0 0 1px var(--accent); }
.nav-toggle {
  display: none; align-items: center; justify-content: center; min-height: 2.75rem; gap: 0.5rem; padding: 0.5rem 0.9rem;
  font: inherit; font-size: var(--step--1); color: var(--text); background: transparent;
  border: 1px solid var(--border); border-radius: 999px; cursor: pointer;
}
.js .nav-toggle { display: inline-flex; }
.site-nav { position: absolute; inset: 100% 0 auto; padding: var(--space-2) 1.25rem var(--space-3); background: var(--bg); border-bottom: 1px solid var(--border); }
.js .site-nav:not(.is-open) { display: none; }
.site-nav ul { display: grid; gap: 0.25rem; }
.site-nav a { display: block; padding: 0.7rem 0; text-decoration: none; color: var(--text-muted); }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--text); }
.site-nav a[aria-current] { font-weight: 600; }

@media (min-width: 48rem) {
  .js .nav-toggle { display: none; }
  .js .site-nav:not(.is-open) { display: block; }
  .site-nav { position: static; padding: 0; background: none; border: 0; }
  .site-nav ul { display: flex; gap: var(--space-3); }
  .site-nav a { position: relative; padding: 0.5rem 0; font-size: var(--step--1); }
  .site-nav a::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
    background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 0.25s var(--ease);
  }
  .site-nav a:hover::after, .site-nav a[aria-current]::after { transform: scaleX(1); }
}

/* ==========================================================================
   Buttons, tags, cards
   ========================================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 2.9rem; gap: 0.5rem; padding: 0.85rem 1.25rem;
  font: 600 var(--step--1)/1 var(--font-sans); text-decoration: none; cursor: pointer;
  border: 1px solid var(--text); border-radius: 999px; color: var(--bg); background: var(--text);
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}
.btn:hover { transform: translateY(-2px); background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }

.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  padding: 0.3rem 0.75rem; font: 500 0.78rem/1.2 var(--font-mono);
  color: var(--text-muted); background: var(--surface-2); border-radius: 999px;
}

.card {
  display: flex; flex-direction: column; overflow: hidden; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.3s;
}
.card:hover, .card:focus-within { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--accent); }
.card__media { overflow: hidden; aspect-ratio: 16 / 10; background: var(--surface-2); }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.card:hover .card__media img { transform: scale(1.04); }
.card__body { display: flex; flex-direction: column; flex: 1; gap: var(--space-1); padding: var(--space-3); }
.card__body p { color: var(--text-muted); font-size: var(--step--1); margin: 0; }
.card__title { margin: 0; font-size: var(--step-1); }
.card__link { text-decoration: none; }
.card__link::after { content: ""; position: absolute; inset: 0; } /* whole card clickable */
.card:has(.card__link:focus-visible) { outline: 3px solid var(--focus); outline-offset: 3px; }
.card { position: relative; }
.card__meta { font: 500 0.78rem/1 var(--font-mono); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.card .tags { margin-top: auto; padding-top: var(--space-2); }
.card__prompt { display: inline-block; width: fit-content; margin-top: 0.25rem; color: var(--text-muted); font: 500 0.7rem/1.3 var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero { padding-block: clamp(4rem, 8vw, 8rem) var(--space-5); }
.hero__grid { display: grid; gap: var(--space-4); align-items: center; }
.hero__content h1 { max-width: 12ch; margin-bottom: var(--space-3); }
.hero__content > .lead { max-width: 56ch; }
.hero__portrait { margin: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.hero__portrait img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.hero__portrait figcaption { padding: 0.75rem 1rem; color: var(--text-muted); font-size: var(--step--1); }
.hero__disciplines { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-top: var(--space-4); color: var(--text-muted); font-size: var(--step--1); }
.hero__disciplines li::before { content: ""; display: inline-block; width: 0.4rem; height: 0.4rem; margin: 0 0.5rem 0.08rem 0; border-radius: 50%; background: var(--accent); }
.project-grid > li { min-width: 0; }
.portfolio-intro { max-width: 58rem; }
.portfolio-intro h1 { max-width: 15ch; margin-bottom: var(--space-2); }
.experience-slot { padding: var(--space-3); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.contact-section { padding-block: var(--space-5); }
.contact-panel { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--space-4); padding: clamp(1.5rem, 4vw, 3rem); background: var(--surface); border: 1px solid var(--border); border-radius: calc(var(--radius) * 1.5); }
.contact-panel h2 { max-width: 16ch; font-size: var(--step-2); }
.contact-panel .lead { max-width: 55ch; margin-bottom: 0; }
@media (min-width: 56rem) {
  .hero__grid { grid-template-columns: minmax(0, 1.5fr) minmax(16rem, 0.8fr); gap: clamp(3rem, 8vw, 7rem); }
  .hero__portrait { max-width: 23rem; justify-self: end; }
}

/* ==========================================================================
   Resume / timeline
   ========================================================================== */
.timeline { border-left: 1px solid var(--border); margin-left: 0.4rem; }
.timeline__item { position: relative; padding: 0 0 var(--space-4) var(--space-3); }
.timeline__item::before {
  content: ""; position: absolute; left: -0.36rem; top: 0.6rem; width: 0.7rem; height: 0.7rem;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.timeline__date { font: 500 var(--step--1)/1.4 var(--font-mono); color: var(--text-muted); }
.timeline__item h3 { margin: 0.25rem 0; }
.split { display: grid; gap: var(--space-3); }
@media (min-width: 56rem) { .split { grid-template-columns: minmax(14rem, 0.8fr) minmax(0, 1.5fr); gap: var(--space-5); } }
.skill-list { display: grid; gap: var(--space-2); }
.skill-list > div { padding-block: var(--space-2); border-bottom: 1px solid var(--border); }
.skill-list dt { font-weight: 600; }
.skill-list dd { margin: 0.25rem 0 0; color: var(--text-muted); }

/* ==========================================================================
   Filters (portfolio)
   ========================================================================== */
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: var(--space-4); }
.filter {
  min-height: 2.75rem; padding: 0.5rem 1rem; font: inherit; font-size: var(--step--1); color: var(--text);
  background: transparent; border: 1px solid var(--border); border-radius: 999px; cursor: pointer;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}
.filter:hover { border-color: var(--accent); }
.filter[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
[hidden] { display: none !important; }

/* ==========================================================================
   Case study
   ========================================================================== */
.cs-meta { display: grid; gap: var(--space-3); grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); margin-block: var(--space-4); padding-block: var(--space-3); border-block: 1px solid var(--border); }
.cs-meta dt { font: 500 0.78rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); margin-bottom: 0.4rem; }
.cs-meta dd { margin: 0; font-weight: 600; }
.cs-header { max-width: 70rem; margin-inline: auto; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 0.65rem; margin-bottom: var(--space-4); color: var(--text-muted); font-size: var(--step--1); }
.breadcrumbs a { text-decoration: none; }
.cs-header h1 { max-width: 15ch; }
.cs-header > .lead { max-width: 60ch; }
.cs-layout { display: grid; gap: var(--space-3); margin-top: var(--space-5); }
.cs-toc { font-size: var(--step--1); }
.cs-toc ol { display: flex; gap: 0.35rem; overflow-x: auto; overscroll-behavior-inline: contain; padding: 0.5rem 0; scrollbar-width: thin; }
.cs-toc li { flex: 0 0 auto; }
.cs-toc a { display: block; padding: 0.55rem 0.75rem; border-bottom: 2px solid transparent; text-decoration: none; color: var(--text-muted); white-space: nowrap; transition: color 0.2s, border-color 0.2s; }
.cs-toc a:hover, .cs-toc a.is-active { color: var(--text); border-bottom-color: var(--accent); }
.cs-content { min-width: 0; }
.cs-section { padding-block: var(--space-4); border-top: 1px solid var(--border); }
.cs-section:first-child { border-top: 0; padding-top: 0; }
.cs-section h2 { font-size: var(--step-2); }
.cs-figure { margin: var(--space-3) 0; }
.cs-figure img { border-radius: var(--radius); border: 1px solid var(--border); width: 100%; }
.cs-figure figcaption { margin-top: 0.5rem; font-size: var(--step--1); color: var(--text-muted); }
.cs-hero img { aspect-ratio: 16 / 9; object-fit: cover; }
.pager { display: flex; justify-content: space-between; gap: var(--space-2); flex-wrap: wrap; padding-top: var(--space-3); }
@media (min-width: 64rem) {
  .cs-layout { grid-template-columns: minmax(12rem, 0.35fr) minmax(0, 1fr); gap: var(--space-5); }
  .cs-toc { position: sticky; top: 5.5rem; align-self: start; max-height: calc(100vh - 7rem); overflow-y: auto; }
  .cs-toc ol { display: grid; gap: 0.4rem; overflow: visible; padding: 0; }
  .cs-toc a { white-space: normal; padding: 0.45rem 0 0.45rem 0.85rem; border-bottom: 0; border-left: 2px solid var(--border); }
  .cs-toc a:hover, .cs-toc a.is-active { border-left-color: var(--accent); }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { padding-block: var(--space-4); border-top: 1px solid var(--border); font-size: var(--step--1); color: var(--text-muted); }
.site-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2); }
.site-footer ul { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.site-footer a { text-underline-offset: 0.25em; }

/* ==========================================================================
   Motion
   ========================================================================== */
.js [data-reveal] { opacity: 0; transform: translateY(0.75rem); transition: opacity 0.55s var(--ease), transform 0.55s var(--ease); transition-delay: var(--delay, 0ms); }
.js [data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
}

@media (forced-colors: active) {
  .btn, .filter, .tag, .card { border: 1px solid CanvasText; }
  .brand__mark, .hero__disciplines li::before { background: CanvasText; }
}

@media print {
  .site-header, .site-footer, .btn-row, .nav-toggle { display: none; }
  body { background: #fff; color: #000; }
}

@media (max-width: 40rem) {
  .section__head--row { align-items: start; flex-direction: column; }
  .contact-panel { align-items: start; flex-direction: column; }
  .contact-panel .btn { width: 100%; }
  .site-footer__inner { flex-direction: column; }
}