/* ==========================================================================
   jasonclau.com — one stylesheet for the whole site.
   Design intent: restrained, typographic, fast. No JavaScript.
   Body face: Source Serif 4 (self-hosted variable font, /fonts/).
   Until the font files are uploaded, the site falls back to Georgia.
   Chinese characters render in each system's native serif CJK face.
   ========================================================================== */

@font-face {
  font-family: "Source Serif 4 Variable";
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url("/fonts/source-serif-4-latin-wght-normal.woff2") format("woff2-variations");
}
@font-face {
  font-family: "Source Serif 4 Variable";
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url("/fonts/source-serif-4-latin-wght-italic.woff2") format("woff2-variations");
}

:root {
  --paper: #fdfcf8;
  --ink: #21201d;
  --muted: #6e675e;
  --line: #e4dfd6;
  --accent: #8c3b2e;         /* madder red — links only */
  --accent-hover: #6d2c22;
  --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171614;
    --ink: #e8e4dc;
    --muted: #a09888;
    --line: #33302b;
    --accent: #d08a77;
    --accent-hover: #e0a695;
  }
}

* { box-sizing: border-box; }

html {
  font-size: 106.25%; /* 17px base */
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Serif 4 Variable", "Source Serif 4", Georgia,
    "Iowan Old Style", "Times New Roman",
    "Songti SC", "Noto Serif CJK SC", SimSun, serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

/* ---- links ---- */
a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}
a:hover { color: var(--accent-hover); }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--paper);
  padding: 0.5rem 1rem;
}
.skip:focus { left: 0; z-index: 10; }

/* ---- header & nav ---- */
.site-header {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.25rem 1.25rem 0;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.wordmark {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.wordmark:hover { color: var(--accent); }

body.home .wordmark { display: none; }
body.home .site-header { justify-content: flex-end; }

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 0.92rem;
}
.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}
.site-header nav a:hover { color: var(--accent); }
.site-header nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.35em;
}

/* ---- main ---- */
main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  width: 100%;
  flex: 1;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.2;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.25rem;
  font-weight: 650;
  margin: 2.5rem 0 0.5rem;
}

h3 {
  font-size: 1.02rem;
  font-weight: 650;
  margin: 1.75rem 0 0.25rem;
}

p { margin: 0 0 1.1rem; }

ul { padding-left: 1.2rem; }
li { margin-bottom: 0.5rem; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

.muted { color: var(--muted); }

.smallcaps {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.06em;
}

/* ---- home ---- */
.role {
  color: var(--muted);
  margin-bottom: 2.25rem;
  font-size: 0.98rem;
}

.rule {
  width: 34px;
  height: 3px;
  background: var(--accent);
  border: 0;
  margin: 0 0 1.25rem;
}

.thesis {
  font-size: 1.55rem;
  line-height: 1.45;
  font-weight: 500;
  margin: 0 0 1.5rem;
  text-wrap: balance;
}

.home-links {
  list-style: none;
  padding: 0;
  margin-top: 2rem;
}
.home-links li { margin-bottom: 0.4rem; }


/* ---- entry lists (writing index, cv) ---- */
.entry { margin-bottom: 1.75rem; }
.entry .when {
  color: var(--muted);
  font-size: 0.88rem;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.06em;
}
.entry p { margin: 0.15rem 0 0; }

/* ---- essay ---- */
article.essay { max-width: 38rem; }

article.essay .dek {
  font-size: 1.2rem;
  font-style: italic;
  color: var(--muted);
  line-height: 1.5;
  margin: 0.25rem 0 0.75rem;
}

article.essay .meta {
  font-size: 0.88rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

article.essay p { margin-bottom: 1.35rem; }

article.essay h2 {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.14em;
  font-weight: 500;
  font-size: 1.05rem;
  text-align: center;
  margin: 3rem 0 1.75rem;
}

article.essay .kicker { font-weight: 500; }

.sep {
  text-align: center;
  color: var(--muted);
  letter-spacing: 0.5em;
  margin: 2.75rem 0 2.75rem 0.5em;
  font-size: 0.95rem;
}

.cite-block {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}
.cite-block .essay-ref {
  font-size: 0.82rem;
  color: var(--muted);
}
.cite-block details { margin-top: 0.75rem; }
.cite-block summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.85rem;
}
.cite-block pre {
  font-size: 0.72rem;
  line-height: 1.5;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  color: var(--muted);
}

/* ---- footer ---- */
.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.25rem;
  width: 100%;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

/* ---- small screens ---- */
@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .thesis { font-size: 1.3rem; }
  .site-header { padding-top: 1.5rem; }
}