/* ---------------------------------------------------
   Design tokens
--------------------------------------------------- */
:root {
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-ink: #0a0a0a;
  --color-ink-soft: #6b6b6b;
  --color-line: #d9d9d9;
  --color-accent: #8a6a00;
  --color-accent-fill: #ffcc00;
  --color-accent-ink: #0a0a0a;

  --font-body: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", "Consolas", "Liberation Mono", monospace;
  --font-display: var(--font-body);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --radius: 0px;
  --max-width: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0a0a;
    --color-surface: #0a0a0a;
    --color-ink: #ffffff;
    --color-ink-soft: #9a9a9a;
    --color-line: #2c2c2c;
    --color-accent: #ffcc00;
    --color-accent-fill: #ffcc00;
    --color-accent-ink: #0a0a0a;
  }
}

/* ---------------------------------------------------
   Reset
--------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.5;
  font-size: 1rem;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
  text-transform: uppercase;
}
p { margin: 0 0 var(--space-2); }
ul { margin: 0; padding: 0; }
button, input, textarea { font-family: inherit; font-size: inherit; }

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

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

/* ---------------------------------------------------
   Layout
--------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

section { padding: var(--space-5) 0; border-bottom: 1px solid var(--color-line); }
section:last-of-type { border-bottom: none; }

/* ---------------------------------------------------
   Nav
--------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  max-width: var(--max-width);
  margin: 0 auto;
}
.nav__brand {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.nav__brand::before {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--color-accent-fill);
}
.nav__links {
  display: flex;
  gap: var(--space-3);
  list-style: none;
}
.nav__links a {
  text-decoration: none;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
}
.nav__links a:hover,
.nav__links a[aria-current="page"] {
  border-bottom-color: var(--color-accent);
}
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  color: var(--color-ink);
}
.nav__toggle svg { width: 24px; height: 24px; }

@media (max-width: 640px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    inset: 100% 0 auto 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) var(--space-3);
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { display: block; padding: var(--space-2) 0; }
}

/* ---------------------------------------------------
   Buttons
--------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.85rem;
  border: 1px solid var(--color-ink);
  cursor: pointer;
}
.btn--primary {
  background: var(--color-ink);
  color: var(--color-bg);
}
.btn--primary:hover { background: var(--color-accent-fill); border-color: var(--color-accent-fill); color: var(--color-accent-ink); }
.btn--secondary {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn--secondary:hover { background: var(--color-ink); color: var(--color-bg); }

/* ---------------------------------------------------
   Hero
--------------------------------------------------- */
.hero {
  padding: var(--space-6) 0 var(--space-5);
}
.hero__eyebrow {
  color: var(--color-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin-bottom: var(--space-2);
}
.hero__eyebrow::before { content: "// "; }
.hero h1 {
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  max-width: 18ch;
}
.hero__lead {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 52ch;
  margin-bottom: var(--space-3);
  text-transform: none;
}
.hero__actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* ---------------------------------------------------
   Section headers
--------------------------------------------------- */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.section-header h2 { margin: 0; font-size: 1.3rem; }
.section-header__link {
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.section-header__link:hover { color: var(--color-accent); }

/* ---------------------------------------------------
   Cards (projects)
--------------------------------------------------- */
.grid {
  display: grid;
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: background 0.15s ease, color 0.15s ease;
}
.card:hover { background: var(--color-ink); color: var(--color-bg); }
.card:hover .card__media { background: var(--color-ink-soft); color: var(--color-bg); }
.card__media {
  aspect-ratio: 4 / 3;
  background: var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-soft);
  font-size: 0.8rem;
  text-align: center;
  padding: var(--space-2);
}
.card__body { padding: var(--space-3); flex: 1; display: flex; flex-direction: column; }
.card__tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: var(--space-1);
}
.card h3 { font-size: 1rem; margin-bottom: var(--space-1); text-transform: none; }
.card p { color: var(--color-ink-soft); font-size: 0.9rem; margin-bottom: 0; }
.card:hover p, .card:hover .card__tag { color: var(--color-bg); }
.card--placeholder .card__media { font-style: normal; }

/* ---------------------------------------------------
   Blog: principle cards
--------------------------------------------------- */
.principle-grid {
  display: grid;
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
}
.principle-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-3);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: background 0.15s ease, color 0.15s ease;
}
.principle-card:hover { background: var(--color-ink); color: var(--color-bg); }
.principle-card:hover p { color: var(--color-bg); opacity: 0.7; }
.principle-card__icon { font-size: 1.5rem; margin-bottom: var(--space-1); }
.principle-card h3 { font-size: 0.95rem; margin-bottom: 0.25rem; text-transform: uppercase; }
.principle-card p { color: var(--color-ink-soft); font-size: 0.85rem; margin-bottom: 0; text-transform: none; }

.category-label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  margin: var(--space-4) 0 var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.category-label::before { content: "["; }
.category-label::after { content: "]"; }

/* ---------------------------------------------------
   Accordion: collapsible entries (blog principles, services)
--------------------------------------------------- */
.accordion-list {
  border-top: 1px solid var(--color-line);
  margin-bottom: var(--space-3);
}
.accordion-item {
  border-bottom: 1px solid var(--color-line);
}
.accordion-item__summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  cursor: pointer;
  list-style: none;
}
.accordion-item__summary::-webkit-details-marker { display: none; }
.accordion-item__summary::marker { content: ""; }
.accordion-item__summary:hover .accordion-item__name { color: var(--color-accent); }
.accordion-item__icon { font-size: 1.5rem; flex-shrink: 0; }
.accordion-item__meta { flex: 1; min-width: 0; }
.accordion-item__code { color: var(--color-accent); font-size: 0.75rem; font-weight: 700; }
.accordion-item__name { font-size: 1rem; text-transform: uppercase; margin: 0.15rem 0; transition: color 0.15s ease; }
.accordion-item__teaser { color: var(--color-ink-soft); font-size: 0.85rem; }
.accordion-item__toggle {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: transform 0.15s ease;
}
.accordion-item[open] .accordion-item__toggle { transform: rotate(45deg); }

.accordion-content {
  padding: 0 0 var(--space-4);
}
.accordion-content .article-body { max-width: none; }
.accordion-content .article-body h2:first-child { margin-top: 0; }

.service-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.service-list li {
  padding: var(--space-1) 0;
  color: var(--color-ink-soft);
  border-bottom: 1px dashed var(--color-line);
}
.service-list li:last-child { border-bottom: none; }

/* ---------------------------------------------------
   Article
--------------------------------------------------- */
.article-header { padding-bottom: var(--space-3); }
.article-header__icon { font-size: 2.5rem; }
.article-header h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
.article-header__summary {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 55ch;
  text-transform: none;
}

.article-body { max-width: 42rem; }
.article-body h2 { font-size: 1.1rem; margin-top: var(--space-4); }
.article-body p { color: var(--color-ink); }

.callout {
  background: var(--color-surface);
  border: 1px solid var(--color-ink);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--space-3);
  margin: var(--space-3) 0;
}
.callout__label {
  font-weight: 700;
  color: var(--color-accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-1);
}

.figure {
  margin: var(--space-3) 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
}
.figure__media {
  aspect-ratio: 16 / 9;
  background: var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-soft);
  font-size: 0.8rem;
  text-align: center;
  padding: var(--space-2);
}
.figure figcaption {
  padding: var(--space-2);
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  border-top: 1px solid var(--color-line);
}

.article-nav {
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-3);
  margin-top: var(--space-5);
}
.article-nav a {
  text-decoration: none;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.article-nav a:hover { color: var(--color-accent); }

/* ---------------------------------------------------
   Contact
--------------------------------------------------- */
.contact-list { list-style: none; margin-top: var(--space-3); border-top: 1px solid var(--color-line); }
.contact-list li { padding: var(--space-3) 0; border-bottom: 1px solid var(--color-line); }
.contact-list a {
  text-decoration: none;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.contact-list a:hover { color: var(--color-accent); }
.contact-list__placeholder { color: var(--color-ink-soft); text-transform: uppercase; letter-spacing: 0.02em; font-size: 0.9rem; }

/* ---------------------------------------------------
   Footer
--------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: var(--space-4) 0;
  color: var(--color-ink-soft);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--color-accent); }

/* ---------------------------------------------------
   About: bio
--------------------------------------------------- */
.bio {
  max-width: 60ch;
  font-size: 1.05rem;
}
.bio__placeholder {
  color: var(--color-ink-soft);
  border: 1px dashed var(--color-line);
  padding: var(--space-3);
}

/* ---------------------------------------------------
   Playful scene switcher
--------------------------------------------------- */
.scene-switcher__controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  margin-bottom: 1px;
}
.scene-switcher__btn {
  flex: 1;
  min-width: 7rem;
  background: var(--color-surface);
  border: none;
  padding: var(--space-2);
  font-family: inherit;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  cursor: pointer;
  color: var(--color-ink-soft);
}
.scene-switcher__btn:hover { color: var(--color-ink); }
.scene-switcher__btn[aria-pressed="true"] {
  background: var(--color-ink);
  color: var(--color-bg);
}

.scene-switcher__stage {
  border: 1px solid var(--color-line);
  border-top: none;
  aspect-ratio: 16 / 10;
  position: relative;
  background: var(--color-surface);
}
.scene {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-3);
  color: var(--color-ink-soft);
  font-size: 0.9rem;
}
.scene.is-active { display: flex; }