/* ============================================================
   Joonsuk Bae — personal site
   Design: Muji / Hara Kenya restraint. Off-white field, ink text,
   single hanko-red accent used sparingly. Asymmetric column at
   wide widths. Strict vertical rhythm. No animation, no shadow.
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}
ul, ol { list-style: none; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

/* ---------- Tokens ---------- */
:root {
  /* Type — system stack first; serif as accent; tabular for numbers */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI",
               "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Newsreader", "Source Serif Pro", "Iowan Old Style",
                "Apple Garamond", "Baskerville", "Times New Roman",
                "Droid Serif", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo,
               Consolas, "Liberation Mono", monospace;

  /* Scale (modular, 1.2 ratio anchored at 16px) */
  --fs-xs:   0.75rem;   /* 12 */
  --fs-sm:   0.875rem;  /* 14 */
  --fs-base: 1rem;      /* 16 */
  --fs-md:   1.125rem;  /* 18 */
  --fs-lg:   1.375rem;  /* 22 */
  --fs-xl:   1.75rem;   /* 28 */
  --fs-2xl:  2.25rem;   /* 36 */
  --fs-3xl:  3rem;      /* 48 */

  /* Rhythm (8px baseline) */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4rem;
  --s-9: 6rem;
  --s-10: 8rem;

  /* Color — off-white / sumi ink / hanko vermilion */
  --c-paper: #fafaf7;
  --c-ink:   #1a1a1a;
  --c-ink-2: #4a4a48;     /* secondary text */
  --c-ink-3: #6f6f6a;     /* tertiary captions; ≥4.5:1 contrast on paper */
  --c-rule:  #e5e3dc;     /* hairlines */
  --c-rule-2:#d4d1c8;     /* slightly stronger rule */
  --c-accent:#9b2c2c;     /* hanko red, used only on hover/marker */

  /* Layout */
  --content-max: 720px;     /* main reading column */
  --wide-max:   1100px;     /* full page frame */
  --gutter:     2rem;

  /* Motion */
  --t-fast: 90ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-paper: #0e0e0d;
    --c-ink:   #ebe9e1;
    --c-ink-2: #b6b4ac;
    --c-ink-3: #7a7872;
    --c-rule:  #2a2925;
    --c-rule-2:#3a3833;
    --c-accent:#c97070;
  }
}

/* ---------- Base ---------- */
html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  font-feature-settings: "ss01", "kern", "liga", "calt";
  font-variant-numeric: oldstyle-nums proportional-nums;
  letter-spacing: -0.005em;
}

/* ---------- Layout frame ---------- */
.page {
  max-width: var(--wide-max);
  margin: 0 auto;
  padding: var(--s-7) var(--gutter) var(--s-10);
}

.col {
  max-width: var(--content-max);
}

/* Asymmetric two-column at wide widths — rehlers-style:
   a slim left rail with section labels, wide reading column right. */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-5);
}

@media (min-width: 900px) {
  .grid {
    grid-template-columns: 160px minmax(0, var(--content-max));
    gap: var(--s-7);
  }
  .grid > .label {
    text-align: left;
    padding-top: var(--s-1);
  }
}

/* ---------- Header ---------- */
.site-header {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding-bottom: var(--s-7);
  margin-bottom: var(--s-7);
  border-bottom: 1px solid var(--c-rule);
}
@media (min-width: 700px) {
  .site-header {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--s-6);
  }
}

.brand {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--fs-lg);
  letter-spacing: -0.01em;
  line-height: 1;
}
.brand a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5em;
}
.brand .mark {
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  background: var(--c-accent);
  border-radius: 1px;
  transform: translateY(-0.05em);
}

.nav {
  display: flex;
  gap: var(--s-5);
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
  flex-wrap: wrap;
}
.nav a {
  position: relative;
  padding-bottom: 2px;
  transition: color var(--t-fast) ease;
}
.nav a:hover { color: var(--c-ink); }
.nav a.is-current {
  color: var(--c-ink);
  border-bottom: 1px solid var(--c-ink);
}

/* ---------- Section labels (left rail) ---------- */
.label {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  font-weight: 500;
}

/* ---------- Headings ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--c-ink);
}

h1 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--s-4);
}
@media (min-width: 700px) {
  h1 { font-size: var(--fs-3xl); }
}

h2 {
  font-size: var(--fs-xl);
  margin-bottom: var(--s-4);
}

h3 {
  font-size: var(--fs-md);
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: var(--s-2);
}

/* ---------- Prose ---------- */
.prose p + p { margin-top: var(--s-4); }
.prose p,
.prose li {
  color: var(--c-ink);
  max-width: 64ch;
}
.prose a {
  border-bottom: 1px solid var(--c-rule-2);
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}
.prose a:hover {
  border-bottom-color: var(--c-accent);
  color: var(--c-accent);
}

.lede {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  line-height: 1.5;
  color: var(--c-ink);
  max-width: 38em;
  margin-bottom: var(--s-6);
}

/* ---------- Section ---------- */
section + section {
  margin-top: var(--s-8);
  padding-top: var(--s-7);
  border-top: 1px solid var(--c-rule);
}

/* ---------- Lists ---------- */
.list {
  display: flex;
  flex-direction: column;
  gap: var(--s-5);
}
.list-tight { gap: var(--s-3); }

.entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-1);
}
.entry .meta {
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-ink-3);
}
.entry .title {
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--c-ink);
}
.entry .title em { font-style: italic; color: var(--c-ink); }
.entry .sub {
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
}
.entry a {
  border-bottom: 1px solid var(--c-rule-2);
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}
.entry a:hover { border-bottom-color: var(--c-accent); color: var(--c-accent); }

/* Two-column row: title on left, date on right */
.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-4);
  align-items: baseline;
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--c-rule);
}
.row:last-child { border-bottom: none; }
.row .when {
  font-size: var(--fs-sm);
  color: var(--c-ink-3);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-top: 0.18em;
}
.row .what { font-size: var(--fs-base); line-height: 1.45; }
.row .what em { font-style: italic; color: var(--c-ink-2); }
/* When a .kind tag precedes the title <em>, drop the title onto its own line */
.row .what .kind + em,
.row .what .kind ~ em {
  display: block;
  margin-top: var(--s-1);
  font-size: var(--fs-sm);
}
.row .what .where { font-weight: 500; }
.row .what .where a,
.row .what a .where { color: inherit; }
.row .what .kind {
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  margin-left: var(--s-3);
  padding-left: var(--s-3);
  border-left: 1px solid var(--c-rule);
}

/* ---------- Publications ---------- */
.pub {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: var(--s-4);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--c-rule);
}
.pub:last-child { border-bottom: none; }
.pub .num {
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-xs);
  color: var(--c-ink-3);
  padding-top: 0.35em;
  letter-spacing: 0.05em;
}
.pub .body { display: flex; flex-direction: column; gap: var(--s-2); }
.pub .authors {
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
  line-height: 1.5;
}
.pub .authors .me { color: var(--c-ink); font-weight: 500; }
.pub .ptitle {
  font-size: var(--fs-base);
  color: var(--c-ink);
  font-weight: 400;
}
.pub .venue {
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
}
.pub .venue em { font-style: italic; }
.pub .links {
  display: flex;
  gap: var(--s-4);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  margin-top: var(--s-1);
}
.pub .links a {
  border-bottom: 1px solid var(--c-rule-2);
  padding-bottom: 1px;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.pub .links a:hover { color: var(--c-accent); border-bottom-color: var(--c-accent); }
.pub .role {
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
  font-style: italic;
}
.pub .tag,
.role .tag {
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  margin-right: var(--s-3);
  padding-right: var(--s-3);
  border-right: 1px solid var(--c-rule);
}
.tag-lead { color: var(--c-accent); }

/* ---------- Hero (home) ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-6);
  margin-bottom: var(--s-9);
  padding-top: var(--s-3);
}
@media (min-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--s-8);
    align-items: start;
  }
  .hero:has(.portrait) {
    grid-template-columns: minmax(0, 1fr) 220px;
  }
}

/* Availability strip */
.availability {
  color: var(--c-accent, #9b2c2c);
  margin-bottom: var(--s-5);
  font-size: var(--fs-md, 1rem);
}
.availability strong { color: var(--c-accent, #9b2c2c); }

/* Primary CTA style for CV link */
a.cta {
  background: var(--c-accent, #9b2c2c);
  color: #fff;
  padding: 0.3em 0.8em;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 600;
}
a.cta:hover { background: #7a2222; }

/* Small dimmed text inline (e.g., city after venue name) */
.dim { color: var(--c-ink-3, #888); font-weight: normal; }
.hero .kicker {
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  margin-bottom: var(--s-4);
}
.hero h1 {
  margin-bottom: var(--s-5);
  font-size: var(--fs-2xl);
}
@media (min-width: 700px) {
  .hero h1 { font-size: var(--fs-3xl); }
}
.hero .lede {
  margin-bottom: var(--s-6);
  max-width: 36em;
}
.hero .portrait {
  margin: 0;
}
.hero .portrait img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(8%);
}

/* Definition list — used on home "Now" */
.dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
}
.dl dt {
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  padding-top: var(--s-4);
  margin-top: var(--s-4);
  border-top: 1px solid var(--c-rule);
}
.dl dt:first-of-type { border-top: none; margin-top: 0; padding-top: 0; }
.dl dd {
  margin: var(--s-2) 0 0 0;
  max-width: 60ch;
  color: var(--c-ink);
}

/* Skip-link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 0.75rem;
  background: var(--c-ink);
  color: var(--c-paper);
  font-size: var(--fs-sm);
}
.skip:focus { left: 1rem; top: 1rem; z-index: 100; }

/* ---------- Quick links cluster ---------- */
.quick {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2) var(--s-5);
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
}
.quick a {
  border-bottom: 1px solid var(--c-rule-2);
  padding-bottom: 1px;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.quick a:hover { color: var(--c-accent); border-bottom-color: var(--c-accent); }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--s-10);
  padding-top: var(--s-5);
  border-top: 1px solid var(--c-rule);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-3);
  font-size: var(--fs-xs);
  color: var(--c-ink-3);
  letter-spacing: 0.03em;
}

/* ---------- Utilities ---------- */
.muted { color: var(--c-ink-3); }
.serif { font-family: var(--font-serif); }
.italic { font-style: italic; }
.center { text-align: center; }
.kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* CV embed */
.cv-embed {
  width: 100%;
  height: 80vh;
  border: 1px solid var(--c-rule);
  background: var(--c-rule);
}

/* Focus */
a:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* Print */
@media print {
  .nav, .site-footer { display: none; }
  body { background: white; color: black; }
}