/* Indra Imanuel — personal site
   Plain CSS, no build step. Edit freely. */

:root {
  --paper: #F7F8F6;
  --panel: #FFFFFF;
  --ink: #1E2A32;
  --ink-soft: #46545E;
  --meta: #5B6970;
  --rule: #DADFE1;
  --accent: #1F5F73;
  --accent-ink: #164A5B;
  --tag: #E6EDEF;
  --tag-ink: #2E4652;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --max: 860px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #131A1F; --panel: #1A2329; --ink: #E6EAEC; --ink-soft: #B7C1C7;
    --meta: #93A0A8; --rule: #2C3940; --accent: #7FC0D4; --accent-ink: #A3D3E2;
    --tag: #22313A; --tag-ink: #C7D5DC;
  }
}
:root[data-theme="dark"] {
  --paper: #131A1F; --panel: #1A2329; --ink: #E6EAEC; --ink-soft: #B7C1C7;
  --meta: #93A0A8; --rule: #2C3940; --accent: #7FC0D4; --accent-ink: #A3D3E2;
  --tag: #22313A; --tag-ink: #C7D5DC;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: 17px; line-height: 1.6; font-optical-sizing: auto;
}
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-ink); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); color: var(--ink);
        padding: 8px 12px; font-family: var(--sans); font-size: 14px; border: 1px solid var(--rule); z-index: 10; }
.skip:focus { left: 16px; }

/* ---------- header / nav ---------- */
header.top {
  max-width: var(--max); margin: 0 auto; padding: 28px 16px 0;
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--sans);
}
header.top .brand { font-size: 17px; font-weight: 500; color: var(--ink); text-decoration: none; }
header.top nav { display: flex; gap: 22px; font-size: 15px; align-items: center; }
header.top nav a { color: var(--ink-soft); text-decoration: none; padding-bottom: 3px; border-bottom: 1px solid transparent; }
header.top nav a:hover { color: var(--accent); }
header.top nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }
.lang-toggle {
  font-family: var(--sans); font-size: 13px; font-weight: 500; letter-spacing: 0.02em;
  color: var(--ink-soft); text-decoration: none; border: 1px solid var(--rule); border-radius: 999px;
  padding: 6px 10px; line-height: 1; margin-left: 10px; background: var(--panel);
}
.lang-toggle:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
html[lang="ko"] body { font-family: "Noto Serif KR", var(--serif); }
html[lang="ko"] .hero h1, html[lang="ko"] h1.page { letter-spacing: 0; }
.theme-toggle {
  appearance: none; background: var(--panel); border: 1px solid var(--rule); color: var(--ink-soft);
  border-radius: 999px; width: 34px; height: 34px; cursor: pointer; display: inline-flex;
  align-items: center; justify-content: center; padding: 0; margin-left: 6px; vertical-align: middle;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
.theme-toggle .moon { display: block; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
}

main { max-width: var(--max); margin: 0 auto; padding: 44px 16px 64px; }

/* ---------- home hero ---------- */
.hero { display: grid; grid-template-columns: 1fr 200px; gap: 40px; align-items: start; }
.hero h1 { font-size: 34px; line-height: 1.15; font-weight: 600; letter-spacing: -0.01em; margin: 0 0 6px; }
.hero .role { font-family: var(--sans); font-size: 15px; color: var(--ink-soft); margin: 0 0 22px; }
.hero p { margin: 0 0 14px; }
.hero .portrait img { width: 200px; height: 200px; object-fit: cover; border-radius: 6px; display: block; border: 1px solid var(--rule); }
.contacts { list-style: none; padding: 0; margin: 18px 0 0; font-family: var(--sans); font-size: 14.5px;
            display: flex; flex-wrap: wrap; gap: 8px 18px; }
.contacts a { text-decoration: none; }
.contacts a:hover { text-decoration: underline; }

.interests { margin: 30px 0 0; padding: 16px 18px; background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; }
.interests p { margin: 0; font-size: 16px; }

/* ---------- sections ---------- */
section { margin-top: 52px; }
section h2 {
  font-family: var(--sans); font-weight: 500; font-size: 15px; color: var(--meta);
  margin: 0 0 18px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
section h2 a.more { float: right; font-weight: 400; font-size: 14px; }
h1.page { font-size: 30px; font-weight: 600; margin: 0 0 8px; letter-spacing: -0.01em; }
p.page-intro { color: var(--ink-soft); margin: 0 0 36px; max-width: 640px; }

/* news */
.news { list-style: none; padding: 0; margin: 0; }
.news li { display: grid; grid-template-columns: 92px 1fr; gap: 14px; margin: 0 0 10px; font-size: 16px; line-height: 1.55; }
.news time { font-family: var(--sans); font-size: 13.5px; color: var(--meta); padding-top: 3px; }

/* publications */
.pub { display: grid; grid-template-columns: 150px 1fr; gap: 22px; margin: 0 0 30px; align-items: start; }
.pub figure { margin: 0; }
.pub figure img { width: 150px; height: 100px; object-fit: cover; display: block; border: 1px solid var(--rule); background: var(--panel); border-radius: 4px; }
.pub.nothumb { grid-template-columns: 1fr; }
.pub h3 { font-size: 18px; line-height: 1.35; font-weight: 600; margin: 0 0 4px; }
.pub h3 a { color: var(--ink); text-decoration: none; }
.pub h3 a:hover { color: var(--accent); text-decoration: underline; }
.pub .authors { margin: 0 0 4px; font-size: 15.5px; color: var(--ink-soft); }
.pub .authors b { color: var(--ink); font-weight: 600; }
.pub .venue { font-family: var(--sans); font-size: 14px; color: var(--meta); margin: 0 0 8px; }
.pub .abstract { margin: 0 0 8px; font-size: 15.5px; }
.pub .links { font-family: var(--sans); font-size: 14px; }
.pub .links a { margin-right: 16px; }

.tag { font-family: var(--sans); font-size: 12px; background: var(--tag); color: var(--tag-ink);
       padding: 2px 8px; border-radius: 3px; white-space: nowrap; margin-left: 6px; vertical-align: 2px; }

/* projects */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: 16px 18px 14px; display: flex; flex-direction: column; }
.card h3 { font-size: 17px; line-height: 1.35; font-weight: 600; margin: 0 0 4px; }
.card .when { font-family: var(--sans); font-size: 13px; color: var(--meta); margin: 0 0 10px; }
.card p { margin: 0 0 12px; font-size: 15px; line-height: 1.55; flex: 1; }
.card p.when { flex: 0 0 auto; }
.card .stack { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 8px; }
.card .stack span { font-family: var(--sans); font-size: 12px; background: var(--tag); color: var(--tag-ink); padding: 2px 8px; border-radius: 3px; }
.card .links { font-family: var(--sans); font-size: 13.5px; }
.card .links a { margin-right: 14px; }
.group-note { color: var(--ink-soft); font-size: 15.5px; margin: -6px 0 18px; max-width: 640px; }

/* experience / lists */
.exp { list-style: none; padding: 0; margin: 0; }
.exp li { display: grid; grid-template-columns: 130px 1fr; gap: 16px; margin: 0 0 16px; font-size: 16px; line-height: 1.55; }
.exp time { font-family: var(--sans); font-size: 13.5px; color: var(--meta); padding-top: 3px; }
.exp b { font-weight: 600; }
.exp .sub { color: var(--ink-soft); }

.plain { list-style: none; padding: 0; margin: 0; }
.plain li { margin: 0 0 12px; font-size: 16px; line-height: 1.55; }
.plain li .when { font-family: var(--sans); font-size: 13px; color: var(--meta); margin-left: 6px; }

.prose p { margin: 0 0 16px; }
.prose h3 { font-size: 20px; font-weight: 600; margin: 30px 0 8px; }
.prose figure { margin: 22px 0; }
.prose figure img { display: block; width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 4px; }
.prose figcaption { font-family: var(--sans); font-size: 13px; color: var(--meta); margin-top: 8px; }

/* videos */
.videos { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; margin: 4px 0 14px; }
.video { margin: 0; }
.video .frame { position: relative; aspect-ratio: 16 / 9; background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video figcaption { font-family: var(--sans); font-size: 13.5px; color: var(--meta); margin-top: 8px; }
.links-line { font-family: var(--sans); font-size: 14.5px; margin: 0; }

/* blog */
.posts { list-style: none; padding: 0; margin: 0; }
.posts li { margin: 0 0 22px; }
.posts h3 { font-size: 19px; margin: 0 0 2px; font-weight: 600; }
.posts time { font-family: var(--sans); font-size: 13.5px; color: var(--meta); }
.posts p { margin: 6px 0 0; color: var(--ink-soft); font-size: 15.5px; }
.empty { color: var(--ink-soft); font-size: 16px; padding: 18px; border: 1px dashed var(--rule); border-radius: 6px; }

footer.bottom {
  max-width: var(--max); margin: 0 auto; padding: 18px 16px 40px; border-top: 1px solid var(--rule);
  font-family: var(--sans); font-size: 13px; color: var(--meta); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
footer.bottom a { color: var(--meta); }

@media (max-width: 720px) {
  .hero { grid-template-columns: 1fr; }
  .hero .portrait { order: -1; }
  .hero .portrait img { width: 120px; height: 120px; }
  .pub { grid-template-columns: 1fr; gap: 10px; }
  .pub figure img { width: 100%; height: auto; max-height: 180px; }
  .news li, .exp li { grid-template-columns: 1fr; gap: 2px; }
  header.top nav { gap: 16px; font-size: 14px; }
}
@media print {
  header.top nav, .skip { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: none; }
}