/* ==========================================================================
   Natania Wong: site styles, shared by every page.
   Colors live in the tokens below; dark mode redefines them.
   ========================================================================== */

:root {
  --bg:          #fcfcfa;
  --surface:     #ffffff;
  --ink:         #111316;
  --ink-2:       #3f444b;
  --muted:       #7b8089;
  --line:        #e8e8e4;
  --accent:      #114971;
  --accent-soft: rgba(17, 73, 113, .08);
  --live:        #2f9e68;

  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --container: 1040px;
  --gutter: clamp(1.25rem, 5vw, 2.5rem);
  --radius: 14px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg:          #0f1113;
  --surface:     #16191c;
  --ink:         #f2f3f5;
  --ink-2:       #c5c9cf;
  --muted:       #8a9099;
  --line:        #25292e;
  --accent:      #8dbbe6;
  --accent-soft: rgba(141, 187, 230, .12);
  --live:        #4cc38a;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s, color .3s;
}

img { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color .2s, text-decoration-color .2s;
}
a:hover { color: var(--accent); text-decoration-color: currentColor; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--accent-soft); color: var(--ink); }

h1, h2, h3 { color: var(--ink); font-weight: 600; letter-spacing: -.02em; line-height: 1.2; text-wrap: balance; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.skip-link {
  position: absolute; left: -999px; top: .5rem; z-index: 200;
  background: var(--ink); color: var(--bg); padding: .5rem .9rem; border-radius: 8px; text-decoration: none;
}
.skip-link:focus { left: .5rem; }

/* ---------- Navigation ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, background-color .3s;
}
.site-nav.is-scrolled, .site-nav.is-open { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 4rem; }

/* "NW." logo: set in the site font, with a navy period like the typing headline */
.brand {
  font-weight: 600; font-size: 1.4rem; line-height: 1; letter-spacing: -.06em;
  color: var(--ink); text-decoration: none;
}
.brand:hover { color: var(--accent); }
.brand-dot { color: var(--accent); }

.nav-menu { display: flex; align-items: center; gap: .25rem; }
.nav-links { display: flex; gap: .1rem; list-style: none; }
.nav-links a {
  display: block; padding: .4rem .75rem; border-radius: 999px;
  font-size: .9rem; color: var(--muted); text-decoration: none;
}
.nav-links a:hover, .nav-links a.is-active, .nav-links a[aria-current="page"] { color: var(--ink); }

.icon-btn {
  display: grid; place-items: center;
  width: 2.25rem; height: 2.25rem; border-radius: 999px;
  color: var(--muted); transition: color .2s, background-color .2s;
}
.icon-btn:hover { color: var(--ink); background: var(--accent-soft); }
.icon-btn svg { width: 1.1rem; height: 1.1rem; }

.menu-toggle { display: none; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }

/* ---------- Buttons ---------- */
.btn-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .6rem 1rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface);
  font-size: .875rem; font-weight: 500; line-height: 1.2;
  color: var(--ink); text-decoration: none;
  transition: border-color .2s, background-color .2s, color .2s;
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn svg { width: 1rem; height: 1rem; flex-shrink: 0; }
.btn-primary { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }

/* ---------- Hero ---------- */
.hero {
  display: grid; grid-template-columns: 1fr auto;
  gap: clamp(2rem, 6vw, 5rem); align-items: center;
  padding-block: clamp(4rem, 12vw, 8rem) clamp(3.5rem, 9vw, 6rem);
}
.hero h1 {
  font-size: clamp(2.6rem, 6.5vw, 4.25rem);
  line-height: 1.02; letter-spacing: -.045em;
  margin-bottom: 1.25rem;
}
.rotator {
  font-size: clamp(1.2rem, 2.5vw, 1.55rem);
  line-height: 1.35; letter-spacing: -.015em;
  color: var(--ink);
  min-height: 2.7em;            /* room for two lines so the page doesn't jump */
  margin-bottom: 1rem;
}
.caret {
  display: inline-block; width: 2px; height: 1em; margin-left: 2px;
  vertical-align: -.1em; background: var(--accent);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.hero .lead { max-width: 34rem; color: var(--muted); margin-bottom: 2rem; }

.portrait {
  width: clamp(190px, 24vw, 260px); aspect-ratio: 1;
  overflow: hidden; background: var(--line);
  border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%;
  animation: morph 8s ease-in-out infinite;   /* lower the seconds to move faster */
}
.portrait img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 22%; }
@keyframes morph {
  0%, 100% { border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%; }
  25%      { border-radius: 40% 60% 70% 30% / 50% 62% 38% 50%; }
  50%      { border-radius: 33% 67% 40% 60% / 66% 35% 65% 34%; }
  75%      { border-radius: 60% 40% 30% 70% / 38% 64% 36% 62%; }
}

/* ---------- Sections ---------- */
.section { padding: clamp(3.5rem, 8vw, 5.5rem) 0; border-top: 1px solid var(--line); }
.section h2 { font-size: clamp(1.5rem, 3vw, 1.85rem); letter-spacing: -.03em; }
.section > .container > h2 { margin-bottom: 2rem; }
.note { margin-top: 1.75rem; font-size: .9rem; color: var(--muted); }

/* About */
.about { display: grid; grid-template-columns: 1.45fr 1fr; gap: clamp(2rem, 6vw, 4.5rem); }
.prose p + p { margin-top: 1.1rem; }
.facts { display: grid; gap: 1.15rem; align-content: start; }
.facts dt { font-size: .8rem; color: var(--muted); }
.facts dd { font-size: .95rem; color: var(--ink); line-height: 1.6; }

/* Projects */
.projects { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.project {
  display: flex; flex-direction: column; gap: .5rem;
  padding: 1.5rem; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  transition: border-color .25s, transform .25s;
}
.project:hover { border-color: var(--muted); }
.project-title { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.project h3 { font-size: 1.08rem; }
.project-org { font-size: .85rem; color: var(--muted); }
.project-desc { font-size: .94rem; }
.status { display: inline-flex; align-items: center; gap: .4rem; font-size: .75rem; color: var(--muted); white-space: nowrap; }
.status::before {
  content: ''; width: .45rem; height: .45rem; border-radius: 50%;
  background: var(--live); animation: live 2.4s ease-in-out infinite;
}
@keyframes live { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 50%, transparent); } 50% { box-shadow: 0 0 0 5px transparent; } }

/* Paper / prototype / GitHub links at the bottom of a card */
.project-links {
  display: flex; flex-wrap: wrap; gap: .4rem 1.25rem;
  margin-top: auto; padding-top: .9rem; border-top: 1px solid var(--line);
}
.project-desc { margin-bottom: .9rem; }
.project-links a { font-size: .875rem; font-weight: 500; text-decoration: none; }
.project-links a::after { content: ' ↗'; color: var(--muted); }

/* ---------- Experience timeline ---------- */
.timeline { list-style: none; position: relative; max-width: 46rem; padding-left: 1.75rem; }
.timeline::before { content: ''; position: absolute; left: .3rem; top: .6rem; bottom: .6rem; width: 1px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 2.25rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ''; position: absolute; left: -1.75rem; top: .5rem; margin-left: .3rem;
  width: .65rem; height: .65rem; border-radius: 50%; transform: translateX(-50%);
  background: var(--bg); border: 2px solid var(--muted);
  transition: background-color .25s, border-color .25s;
}
.tl-item.is-current::before { background: var(--accent); border-color: var(--accent); }
.tl-head { display: flex; flex-wrap: wrap; align-items: baseline; column-gap: 1rem; }
.tl-item h3 { font-size: 1.02rem; }
.tl-date { margin-left: auto; font-size: .8rem; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.tl-org { font-size: .9rem; color: var(--ink-2); }
.tl-desc { margin-top: .35rem; font-size: .9rem; color: var(--muted); }

/* ---------- Inner page header ---------- */
.page-header { padding-block: clamp(4rem, 12vw, 7rem) clamp(2.5rem, 6vw, 3.5rem); }
.page-header h1 { font-size: clamp(2.4rem, 6vw, 3.75rem); line-height: 1.05; letter-spacing: -.045em; margin-bottom: 1rem; }
.page-header .lead { max-width: 34rem; color: var(--muted); }
.page-short { min-height: calc(100vh - 11rem); }   /* keeps the footer at the bottom on short pages */

/* Gallery */
.gallery { list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.25rem; }
.gallery img { width: 100%; aspect-ratio: 3 / 4; object-fit: cover; border-radius: var(--radius); background: var(--line); }
.gallery h3 { font-size: 1rem; margin-top: .85rem; }
.gallery p { font-size: .85rem; color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 2rem 0 2.5rem; font-size: .85rem; color: var(--muted); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-links { display: flex; gap: 1.25rem; list-style: none; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

/* ---------- Motion ---------- */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s ease, transform .8s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

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

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .menu-toggle { display: grid; }
  .nav-links {
    display: none;
    position: absolute; top: 4rem; left: 0; right: 0;
    flex-direction: column; gap: 0;
    padding: .25rem var(--gutter) 1rem;
    background: var(--bg); border-bottom: 1px solid var(--line);
  }
  .site-nav.is-open .nav-links { display: flex; }
  .nav-links a { padding: .7rem 0; font-size: 1rem; border-radius: 0; }

  .hero { grid-template-columns: 1fr; gap: 2rem; }
  .portrait { order: -1; width: 140px; }
  .about { grid-template-columns: 1fr; }
  .projects { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}