/* Personal site of Ming-Yen Ho. Plain CSS, no build step. */

:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --ink: #1c2128;
  --muted: #586271;
  --rule: #dde1e7;
  --panel: #f5f7fa;
  --link: #002676;
  --link-hover: #0b4fd1;
  --button-ink: #ffffff;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --ink: #e6e9ee;
    --muted: #a3acb8;
    --rule: #2a313b;
    --panel: #1a2029;
    --link: #8fb4ff;
    --link-hover: #c0d4ff;
    --button-ink: #0b1220;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 1rem/1.65 var(--sans);
  text-rendering: optimizeLegibility;
}

.wrap { max-width: 46rem; margin-inline: auto; padding-inline: 1.25rem; }

a { color: var(--link); text-underline-offset: 0.18em; text-decoration-thickness: 0.06em; }
a:hover { color: var(--link-hover); }
a:focus-visible, .button:focus-visible {
  outline: 3px solid var(--link);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--ink); color: var(--bg);
  padding: 0.5rem 0.9rem; border-radius: 4px; z-index: 10;
}
.skip:focus { top: 0.75rem; }

/* Header and navigation */
.site { border-bottom: 1px solid var(--rule); }
.site .wrap {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem;
  justify-content: space-between; align-items: baseline;
  padding-block: 1.1rem;
}
.brand {
  font: 600 1.2rem/1.2 var(--serif);
  color: var(--ink); text-decoration: none; letter-spacing: 0.01em;
}
.brand:hover { color: var(--ink); }
nav ul { display: flex; gap: 1.4rem; list-style: none; margin: 0; padding: 0; }
nav a {
  color: var(--muted); text-decoration: none;
  padding-block: 0.25rem; border-bottom: 2px solid transparent;
}
nav a:hover { color: var(--ink); }
nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--link); }

/* Page body */
main { padding-block: 2.5rem 3.5rem; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.25; margin: 0; text-wrap: balance; }
h1 { font-size: 2.15rem; letter-spacing: -0.005em; }
h3 { font-size: 1.25rem; }

.label {
  font: 600 0.78rem/1.3 var(--sans);
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 0.6rem;
}

.muted { color: var(--muted); }
.role { margin: 0.35rem 0 1.25rem; color: var(--muted); }
p { margin: 0 0 1rem; text-wrap: pretty; }

/* Home */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 13.5rem;
  gap: 2.5rem;
  align-items: start;
}
.portrait {
  display: block; width: 100%; height: auto;
  border-radius: 6px; border: 1px solid var(--rule);
}
.section { margin-top: 2.5rem; }
.jmp {
  margin: 0; padding: 1rem 1.15rem;
  background: var(--panel);
  border-left: 3px solid var(--link);
  border-radius: 0 6px 6px 0;
  font: 600 1.1rem/1.4 var(--serif);
}
.jmp a { text-decoration-thickness: 0.05em; }

.plain { list-style: none; margin: 0; padding: 0; }
.plain li { margin: 0 0 0.9rem; }

/* Research */
.lede { margin-top: 0.5rem; color: var(--muted); }
.group { margin-top: 2.75rem; }
.group:first-of-type { margin-top: 2rem; }
.paper {
  padding-block: 1.5rem;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 1rem;
}
.paper:last-child { padding-bottom: 0; }
.paper .tag {
  display: inline-block; margin: 0 0 0.55rem;
  font: 600 0.72rem/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--link);
}
.paper h3 { margin: 0 0 0.35rem; }
.paper .with { margin: 0 0 0.8rem; color: var(--muted); }
.paper .abstract { margin: 0; max-width: 66ch; font-size: 0.95rem; line-height: 1.6; }
.paper .links { margin: 0.9rem 0 0; font-weight: 600; }

/* CV */
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; align-items: center; margin: 1.1rem 0 1.5rem; }
.button {
  display: inline-block; padding: 0.6rem 1.05rem;
  background: var(--link); color: var(--button-ink);
  border-radius: 6px; text-decoration: none; font-weight: 600;
}
.button:hover { color: var(--button-ink); filter: brightness(1.12); }
.pdf {
  display: block; width: 100%; height: min(86vh, 1150px);
  border: 1px solid var(--rule); border-radius: 6px; background: var(--panel);
}
.pdf-note { display: none; }

/* Footer */
.foot { border-top: 1px solid var(--rule); color: var(--muted); font-size: 0.9rem; }
.foot .wrap { padding-block: 1.25rem 2rem; }

@media (max-width: 40rem) {
  body { font-size: 1rem; }
  h1 { font-size: 1.85rem; }
  .hero { grid-template-columns: 1fr; gap: 1.5rem; }
  .portrait { order: -1; width: 11rem; }
  .pdf { display: none; }
  .pdf-note { display: block; }
}

@media print {
  .site nav, .skip, .actions { display: none; }
  body { font-size: 11pt; }
}