/* Timothy Wong — site styles. Tokens and rules are documented in DESIGN.md; change values there first. */

/* ---------- Tokens ---------- */

:root {
  color-scheme: light;
  --paper: #F6F7F9;
  --surface: #FFFFFF;
  --ink: #16213D;
  --ink-2: #46506A;
  --muted: #5D6680;
  --rule: #DCE0E7;
  --rule-strong: #C3C9D5;
  --data: #2A78D6;
  --wash: rgba(42, 120, 214, 0.08);
  --ambient-strength: 1;

  --font: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.625rem;
  --step-3: 2.25rem;
  --step-display: clamp(2.75rem, 1.6rem + 5.2vw, 5.25rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6.5rem;

  --radius-s: 4px;
  --radius-m: 8px;
  --radius-pill: 999px;

  --wrap: 74rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --measure: 66ch;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0E1424;
    --surface: #151C2F;
    --ink: #E9ECF3;
    --ink-2: #B9C1D2;
    --muted: #929CB2;
    --rule: #2A3450;
    --rule-strong: #3B4766;
    --data: #3987E5;
    --wash: rgba(57, 135, 229, 0.14);
    --ambient-strength: 1.1;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0E1424;
  --surface: #151C2F;
  --ink: #E9ECF3;
  --ink-2: #B9C1D2;
  --muted: #929CB2;
  --rule: #2A3450;
  --rule-strong: #3B4766;
  --data: #3987E5;
  --wash: rgba(57, 135, 229, 0.14);
  --ambient-strength: 1.1;
}

/* ---------- Base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

a, button { touch-action: manipulation; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; }

a { color: inherit; }

h1, h2, h3 {
  margin: 0;
  line-height: 1.15;
  font-weight: 650;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { margin: 0; }

::selection { background: rgba(42, 120, 214, 0.22); }

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

main:focus { outline: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-s);
}

.skip-link:focus { top: var(--space-4); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.icon {
  width: 1.125em;
  height: 1.125em;
  flex: none;
}

/* ---------- Ambient background (assets/js/ambient.js) ---------- */

.ambient {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  /* 100vh is the large viewport on mobile, so the address bar showing or hiding never resizes the canvas. */
  height: 100vh;
  pointer-events: none;
  /* Strongest at the top right, fading towards the reading column on the left. */
  -webkit-mask-image: radial-gradient(135% 115% at 100% 0%, #000 22%, rgba(0, 0, 0, 0.45) 58%, rgba(0, 0, 0, 0.16) 100%);
  mask-image: radial-gradient(135% 115% at 100% 0%, #000 22%, rgba(0, 0, 0, 0.45) 58%, rgba(0, 0, 0, 0.16) 100%);
}

/* ---------- Controls ---------- */

.button,
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0.625rem 1.125rem;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease), color 150ms var(--ease);
}

.button:hover { background: var(--ink-2); border-color: var(--ink-2); }

.button--quiet {
  background: transparent;
  border-color: var(--rule-strong);
  color: var(--ink);
}

.button--quiet:hover { background: var(--wash); border-color: var(--ink-2); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 600;
  cursor: pointer;
}

.icon-button:hover { background: var(--wash); }

/* ---------- Header ---------- */

.site-header { border-bottom: 1px solid var(--rule); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: 4.25rem;
}

.site-name {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-right: auto;
  font-weight: 700;
  font-stretch: 112%;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: var(--space-2) var(--space-2);
  color: var(--ink-2);
  font-size: var(--step--1);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-s);
}

.site-nav a:hover { color: var(--ink); background: var(--wash); }

.site-nav a[aria-current] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--data);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.45em;
}

.nav-toggle { display: none; }
.nav-toggle .icon:nth-of-type(2),
.nav-toggle[aria-expanded="true"] .icon:first-of-type { display: none; }
.nav-toggle[aria-expanded="true"] .icon:nth-of-type(2) { display: block; }

/* The toggle shows the theme you would switch to: a moon in light mode, a sun in dark mode. */
.theme-toggle { display: none; }
.js .theme-toggle { display: inline-flex; }
.theme-toggle .icon:last-child { display: none; }
:root[data-theme="dark"] .theme-toggle .icon:first-child { display: none; }
:root[data-theme="dark"] .theme-toggle .icon:last-child { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon:first-child { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon:last-child { display: block; }
}

@media (max-width: 63.99rem) {
  .js .nav-toggle { display: inline-flex; order: 2; }
  .js .theme-toggle { order: 1; }
  .site-header__inner { flex-wrap: wrap; }
  .site-nav { order: 3; width: 100%; }
  .js .site-nav { display: none; }
  .js .site-nav.is-open { display: block; padding-bottom: var(--space-4); }
  .js .site-nav ul { flex-direction: column; gap: 0; }
  .js .site-nav a {
    padding: var(--space-3) var(--space-2);
    font-size: var(--step-0);
    border-top: 1px solid var(--rule);
    border-radius: 0;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  margin-top: var(--space-9);
  border-top: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: var(--step--1);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-5);
  padding-block: var(--space-6);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  color: var(--muted);
}

.site-footer__meta a { text-underline-offset: 0.2em; }

/* ---------- Profile links ---------- */

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  color: var(--ink);
  font-size: var(--step--1);
  font-weight: 500;
  text-decoration: none;
}

.social-links a:hover span {
  text-decoration: underline;
  text-decoration-color: var(--data);
  text-underline-offset: 0.25em;
}

.social-links--footer a { color: var(--ink-2); }

/* ---------- Home: hero ---------- */

.hero {
  display: grid;
  gap: var(--space-6);
  padding-block: var(--space-8) var(--space-6);
}

.hero__name {
  font-size: var(--step-display);
  font-weight: 720;
  font-stretch: 125%;
  line-height: 0.95;
  letter-spacing: -0.035em;
}

.hero__tagline {
  margin-top: var(--space-4);
  color: var(--ink-2);
  font-size: var(--step-2);
  line-height: 1.3;
  font-weight: 450;
}

.hero__bio {
  max-width: 62ch;
  margin-top: var(--space-6);
}

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

.hero__actions { margin-top: var(--space-6); }

.social-links--hero { margin-top: var(--space-5); }

.hero__portrait {
  width: 7rem;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-m);
  order: -1;
}

@media (min-width: 64rem) {
  .hero {
    grid-template-columns: minmax(0, 1fr) 17rem;
    gap: var(--space-8);
    align-items: center;
    min-height: calc(100vh - 4.25rem - 14rem);
    padding-block: var(--space-9) var(--space-8);
  }
  .hero__portrait {
    order: 0;
    width: 100%;
    aspect-ratio: 4 / 5;
    object-position: 50% 20%;
  }
}

/* ---------- Work list ---------- */

.work-year {
  display: grid;
  gap: var(--space-3);
  padding-block: var(--space-5);
  border-top: 1px solid var(--rule);
}

.work-year__label {
  color: var(--ink-2);
  font-size: var(--step-1);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.work-year__items {
  display: grid;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.work-item { position: relative; }

.work-item__title::after {
  content: "";
  position: absolute;
  inset: calc(-1 * var(--space-2)) calc(-1 * var(--space-3));
  border-radius: 6px;
}

.work-item__title:active::after { background: var(--wash); }

.work-item__title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  text-decoration: none;
}

.work-item__title:hover {
  text-decoration: underline;
  text-decoration-color: var(--data);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.work-item__meta {
  margin-top: var(--space-1);
  color: var(--muted);
  font-size: var(--step--1);
}

@media (min-width: 48rem) {
  .work-year { grid-template-columns: 8.5rem minmax(0, 1fr); gap: 0; }
  .work-year__label { padding-top: 0.1rem; }
  .work-year__items { max-width: 46rem; }
}

/* ---------- Author card (every page except home) ---------- */

.with-author {
  display: grid;
  gap: 0;
}

.author-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-5);
}

.author-card__photo {
  flex: none;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  object-fit: cover;
}

.author-card__text {
  display: grid;
  gap: var(--space-1);
}

.author-card__name {
  justify-self: start;
  color: var(--ink);
  font-weight: 700;
  font-stretch: 112%;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.author-card__name:hover {
  text-decoration: underline;
  text-decoration-color: var(--data);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.author-card__line {
  color: var(--ink-2);
  font-size: var(--step--1);
  line-height: 1.45;
}

@media (min-width: 64rem) {
  .with-author {
    grid-template-columns: 13rem minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }
  .author-card {
    position: sticky;
    top: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    padding-top: var(--space-7);
  }
  .author-card__photo {
    width: 8rem;
    height: 8rem;
  }
  .author-card__name { font-size: var(--step-1); }
}

/* ---------- Section pages ---------- */

.page-head {
  display: grid;
  gap: var(--space-4);
  padding-block: var(--space-7) var(--space-6);
}

/* Inner pages share their width with the author card, so titles stop below the home page's display size. */
.page-head h1,
.entry__title {
  font-size: clamp(2.5rem, 1.5rem + 3.6vw, 4.25rem);
  font-weight: 700;
  font-stretch: 112%;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-head__lede,
.entry__lede {
  max-width: 60ch;
  color: var(--ink-2);
  font-size: var(--step-1);
  line-height: 1.5;
}

.work-year:first-child { border-top-color: var(--rule-strong); }

/* ---------- Entry (detail pages) ---------- */

.entry__head {
  display: grid;
  gap: var(--space-4);
  padding-block: var(--space-7) var(--space-6);
}

.entry__back a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--muted);
  font-size: var(--step--1);
  font-weight: 500;
  text-underline-offset: 0.25em;
}

.entry__back a:hover { color: var(--ink); }

/* Collection items have long titles; keep them a step smaller than page titles. */
.entry__back + .entry__title {
  max-width: 24ch;
  font-size: clamp(2rem, 1.3rem + 2.8vw, 3.25rem);
  line-height: 1.08;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-7);
  margin: var(--space-2) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--rule);
}

.facts div { max-width: 28rem; }

.facts dt {
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 500;
}

.facts dd {
  margin: 0;
  font-size: var(--step--1);
  font-weight: 500;
}

.citation,
.share {
  max-width: var(--measure);
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--rule);
}

.citation h2,
.share__title {
  margin-bottom: var(--space-3);
  font-size: var(--step-0);
  font-weight: 600;
}

.citation__text {
  margin-bottom: var(--space-4);
  color: var(--ink-2);
  font-size: var(--step--1);
}

.share__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.share__links a,
.share__links button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
}

.share__links a:hover,
.share__links button:hover { background: var(--wash); border-color: var(--ink-2); }

/* ---------- Prose ---------- */

.prose { max-width: var(--measure); }

.prose > * + * { margin-top: 1em; }

.prose h2 {
  margin-top: 2.25em;
  font-size: var(--step-2);
}

.prose h3 {
  margin-top: 1.75em;
  font-size: var(--step-1);
}

.prose h2 + *,
.prose h3 + * { margin-top: 0.6em; }

.prose a {
  text-decoration-color: var(--data);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.prose a:hover { text-decoration-thickness: 2px; }

.prose a.button,
.prose a.btn { text-decoration: none; }

.prose ul,
.prose ol { padding-left: 1.25em; }

.prose li + li { margin-top: 0.4em; }

.prose img {
  display: block;
  border-radius: var(--radius-s);
}

.prose blockquote {
  margin-inline: 0;
  padding-left: var(--space-4);
  border-left: 2px solid var(--rule-strong);
  color: var(--ink-2);
}

.prose code {
  font-family: var(--mono);
  font-size: 0.875em;
  padding: 0.1em 0.3em;
  border-radius: var(--radius-s);
  background: var(--wash);
}

.prose pre {
  overflow-x: auto;
  padding: var(--space-4);
  border: 1px solid var(--rule);
  border-radius: var(--radius-s);
  background: var(--surface);
  font-size: var(--step--1);
  line-height: 1.5;
}

.prose pre code { padding: 0; background: none; }

.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
}

.prose th,
.prose td {
  padding: var(--space-3) var(--space-4) var(--space-3) 0;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

.prose thead th {
  color: var(--muted);
  font-weight: 600;
  border-bottom-color: var(--rule-strong);
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin-block: var(--space-7);
}

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

/* ---------- Gallery ---------- */

.prose .gallery,
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  gap: var(--space-6) var(--space-4);
  margin: var(--space-7) 0 0;
  padding: 0;
  list-style: none;
}

/* The gallery sits inside .prose but should use the full page width. */
.entry__body:has(.gallery) { max-width: none; }
.entry__body:has(.gallery) > p { max-width: var(--measure); }

.prose .gallery__item { margin: 0; }

.gallery__open {
  display: block;
  border-radius: var(--radius-s);
  overflow: hidden;
}

.gallery__open img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 0;
  transition: transform 300ms var(--ease);
}

@media (hover: hover) {
  .gallery__open:hover img { transform: scale(1.03); }
}

.gallery__caption {
  margin-top: var(--space-2);
  color: var(--ink-2);
  font-size: var(--step--1);
  line-height: 1.45;
}

.lightbox {
  width: 100%;
  max-width: none;
  height: 100%;
  max-height: none;
  margin: 0;
  padding: var(--space-4);
  border: 0;
  background: transparent;
  color: #E9ECF3;
}

.lightbox[open] {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: var(--space-3);
}

/* ::backdrop does not inherit custom properties in older browsers, so the scrim is a literal. */
.lightbox::backdrop { background: rgba(10, 14, 26, 0.92); }

.lightbox__figure {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: var(--space-3);
  min-height: 0;
  margin: 0;
}

.lightbox__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  min-height: 0;
}

.lightbox__caption {
  max-width: 60ch;
  margin-inline: auto;
  text-align: center;
  font-size: var(--step--1);
}

.lightbox__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.lightbox .icon-button { color: #E9ECF3; }
.lightbox .icon-button:hover { background: rgba(255, 255, 255, 0.12); }

.lightbox__count {
  min-width: 4rem;
  text-align: center;
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
}

.lightbox__close { margin-left: var(--space-5); }

/* ---------- Phones and touch ---------- */

/* Below 64rem the header hides while you scroll down and comes back as soon as you scroll up (site.js). */
@media (max-width: 63.99rem) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--paper);
    background: color-mix(in srgb, var(--paper) 90%, transparent);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    transition: transform 220ms var(--ease);
  }
  .site-header.is-hidden { transform: translateY(-100%); }
  .site-header:focus-within { transform: none; }
}

@media (max-width: 47.99rem) {
  /* Home: tighter hero so the buttons and profile links fit on the first screen. */
  .hero { gap: var(--space-4); padding-block: var(--space-5) var(--space-4); }
  .hero__portrait { width: 5.5rem; }
  .hero__tagline { margin-top: var(--space-3); font-size: 1.375rem; }
  .hero__bio { margin-top: var(--space-4); }
  .hero__actions { margin-top: var(--space-5); }
  .hero__actions .button { flex: 1 1 0; justify-content: center; }
  .social-links--hero { margin-top: var(--space-3); gap: 0 var(--space-4); }

  /* Gallery: two columns, captions clamped to three lines (the viewer shows them in full). */
  .prose .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5) var(--space-3); }
  .gallery__caption {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
    font-size: 0.8125rem;
  }

  .page-head, .entry__head { padding-top: var(--space-5); }
}

/* Long URLs in abstracts and references wrap instead of widening the page. */
.prose p, .citation__text { overflow-wrap: break-word; }

/* Touch screens: 48dp targets (Android's guideline) and visible press feedback. */
@media (pointer: coarse) {
  .button, .btn, .icon-button, .share__links a, .share__links button { min-height: 48px; }
  .icon-button { min-width: 48px; }
  .site-name, .entry__back a, .social-links a { min-height: 48px; }
  .social-links a { min-width: 48px; }
  .site-footer__meta a, .site-footer__meta span { display: inline-flex; align-items: center; min-height: 48px; }
  .site-footer__meta { gap: 0 var(--space-5); }
  .sitemap li a { display: inline-flex; align-items: center; min-height: 44px; }
  .button:active, .btn:active, .share__links a:active, .share__links button:active, .icon-button:active { transform: scale(0.97); }
  .button, .btn, .share__links a, .share__links button, .icon-button { transition: transform 120ms var(--ease), background-color 150ms var(--ease); }
}

/* While the photo viewer is open, the page behind it stays put. */
html:has(.lightbox[open]) { overflow: hidden; }

.lightbox__figure { touch-action: pinch-zoom; }

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Print ---------- */

@media print {
  .site-header, .site-footer, .share, .actions, .skip-link, .ambient { display: none !important; }
  body { background: #fff; color: #000; }
}