/* ==========================================================================
   Variables
   ========================================================================== */

:root {
  color-scheme: light;

  /* Color */
  --background: #f8f8f6;
  --text-primary: #111111;
  --text-secondary: #737373;
  --text-muted: #a0a0a0;
  --border: #dededb;
  --surface-hover: #f1f1ef;

  /* Type */
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  /* Spacing scale: 4 8 12 16 24 32 48 64 96 */
  --space-1: 0.25rem;   /* 4  */
  --space-2: 0.5rem;    /* 8  */
  --space-3: 0.75rem;   /* 12 */
  --space-4: 1rem;      /* 16 */
  --space-6: 1.5rem;    /* 24 */
  --space-8: 2rem;      /* 32 */
  --space-12: 3rem;     /* 48 */
  --space-16: 4rem;     /* 64 */
  --space-24: 6rem;     /* 96 */

  /* Layout */
  --content-width: 42rem; /* ~672px */

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 180ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --background: #161616;
    --text-primary: #ededed;
    --text-secondary: #ababab;
    --text-muted: #868686;
    --border: #30302e;
    --surface-hover: #242422;
  }
}

html:has(#theme-toggle:checked) {
  color-scheme: dark;
  --background: #161616;
  --text-primary: #ededed;
  --text-secondary: #ababab;
  --text-muted: #868686;
  --border: #30302e;
  --surface-hover: #242422;
}

@media (prefers-color-scheme: dark) {
  html:has(#theme-toggle:checked) {
    color-scheme: light;
    --background: #f8f8f6;
    --text-primary: #111111;
    --text-secondary: #737373;
    --text-muted: #a0a0a0;
    --border: #dededb;
    --surface-hover: #f1f1ef;
  }
}

/* ==========================================================================
   Reset / base
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  background: var(--background);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.0625rem; /* 17px */
  line-height: 1.6;
  font-weight: 400;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

ul {
  list-style: none;
  padding: 0;
}

::selection {
  background: var(--text-primary);
  color: var(--background);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.site-header,
main,
.site-footer {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-12);
  padding-bottom: var(--space-16);
}

main {
  padding-bottom: var(--space-24);
}

.section {
  padding-top: var(--space-16);
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1 {
  font-size: clamp(1.75rem, 1.4rem + 1.6vw, 2.25rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.prose {
  color: var(--text-primary);
  max-width: 34rem;
}

.prose + .prose {
  margin-top: var(--space-4);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-name {
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: color var(--duration) var(--ease);
}

.site-nav a:hover {
  color: var(--text-primary);
}

.theme-toggle {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    background-color var(--duration) var(--ease),
    color var(--duration) var(--ease);
}

.theme-toggle:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.theme-toggle input {
  position: absolute;
  opacity: 0;
}

.theme-toggle:has(input:focus-visible) {
  outline: 2px solid var(--text-primary);
  outline-offset: 3px;
  border-radius: 50%;
}

.theme-toggle-icon::before {
  content: "☾";
  font-size: 1.25rem;
  line-height: 1;
}

#theme-toggle:checked + .theme-toggle-icon::before {
  content: "☼";
}

@media (prefers-color-scheme: dark) {
  .theme-toggle-icon::before {
    content: "☼";
  }

  #theme-toggle:checked + .theme-toggle-icon::before {
    content: "☾";
  }
}

/* ==========================================================================
   Intro
   ========================================================================== */

.intro .role {
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

.intro .lede {
  margin-top: var(--space-8);
  max-width: 32rem;
  font-size: 1.125rem;
  line-height: 1.55;
}

.intro .lede + .prose {
  margin-top: var(--space-4);
}

.intro .quote {
  margin-top: var(--space-6);
  margin-inline: 0;
  padding-inline-start: var(--space-4);
  border-inline-start: 2px solid var(--border);
  color: var(--text-secondary);
  font-style: italic;
}

.intro .location {
  margin-top: var(--space-6);
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* ==========================================================================
   Selected work
   ========================================================================== */

.work-item + .work-item {
  border-top: 1px solid var(--border);
}

.work-link,
.work-static {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: var(--space-6);
  row-gap: var(--space-2);
  padding: var(--space-6);
  /* pull padding back to the content edge while keeping a hover inset */
  margin-inline: calc(var(--space-6) * -1);
  border-radius: 4px;
}

.work-link {
  transition: background-color var(--duration) var(--ease);
}

.work-link:hover {
  background: var(--surface-hover);
}

.work-head {
  grid-column: 1;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
}

.work-name {
  font-weight: 500;
  letter-spacing: -0.01em;
}

.work-year {
  color: var(--text-muted);
  font-size: 0.875rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.work-desc {
  grid-column: 1;
  color: var(--text-secondary);
  max-width: 32rem;
}

.work-arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  color: var(--text-muted);
  transition:
    transform var(--duration) var(--ease),
    color var(--duration) var(--ease);
}

.work-link:hover .work-arrow,
.work-link:focus-visible .work-arrow {
  color: var(--text-primary);
  transform: translate(2px, -2px);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding-top: var(--space-16);
  padding-bottom: var(--space-12);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 34rem) {
  .site-header {
    flex-direction: column;
    gap: var(--space-4);
    padding-top: var(--space-8);
    padding-bottom: var(--space-12);
  }

  .site-nav {
    justify-content: flex-start;
    gap: var(--space-4);
  }

  .section {
    padding-top: var(--space-12);
  }

  /* Stack name and year on narrow screens */
  .work-head {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

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

:focus:not(:focus-visible) {
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}