/* ==========================================================================
   Hyunsoo Kim — personal site
   Minimal academic layout inspired by the al-folio theme.
   Accent color lives in --accent (one place to change the whole site).
   ========================================================================== */

:root {
  --accent: #bf5700;              /* UT Austin burnt orange */
  --accent-soft: rgba(191, 87, 0, 0.10);
  --text: #1c1c1c;
  --text-muted: #6f6f6f;
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --border: rgba(0, 0, 0, 0.10);
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --nav-bg: rgba(255, 255, 255, 0.88);
  --font-body: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-head: "Roboto Slab", Georgia, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #ff8f3f;
    --accent-soft: rgba(255, 143, 63, 0.14);
    --text: #e8e8e8;
    --text-muted: #a0a0a0;
    --bg: #121212;
    --bg-soft: #1b1b1b;
    --border: rgba(255, 255, 255, 0.14);
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(18, 18, 18, 0.88);
  }
}

html[data-theme="dark"] {
  --accent: #ff8f3f;
  --accent-soft: rgba(255, 143, 63, 0.14);
  --text: #e8e8e8;
  --text-muted: #a0a0a0;
  --bg: #121212;
  --bg-soft: #1b1b1b;
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  --nav-bg: rgba(18, 18, 18, 0.88);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

a:hover { border-bottom-color: var(--accent); }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

h1 { font-size: 2.2rem; margin: 0 0 0.2rem; }
h2 { font-size: 1.45rem; margin: 2.6rem 0 1rem; }
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.4rem; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.2rem 0;
}

img { max-width: 100%; }

/* ---------- navigation ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-nav__inner {
  max-width: 940px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-nav__brand {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--text);
  border: 0;
  white-space: nowrap;
}

.site-nav__brand:hover { color: var(--accent); border: 0; }

.site-nav__links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.site-nav__links a {
  color: var(--text);
  font-size: 0.94rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  border: 0;
}

.site-nav__links a:hover { background: var(--accent-soft); color: var(--accent); }

.site-nav__links a.is-active { color: var(--accent); font-weight: 500; }

.theme-toggle {
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  padding: 0.3rem 0.4rem;
  line-height: 1;
}

.theme-toggle:hover { color: var(--accent); }

/* ---------- page frame ---------- */

.page {
  max-width: 940px;
  margin: 0 auto;
  padding: 2.6rem 1.5rem 3rem;
}

.page__title { margin-bottom: 0.35rem; }

.page__subtitle {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin: 0 0 1.6rem;
}

/* ---------- about header ---------- */

.profile {
  float: right;
  width: 260px;
  margin: 0.2rem 0 1.5rem 2rem;
  text-align: center;
}

.profile img {
  width: 100%;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.profile__caption {
  margin-top: 0.6rem;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.social {
  margin: 0.9rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-size: 1.28rem;
}

.social a { color: var(--text-muted); border: 0; }
.social a:hover { color: var(--accent); }

.about-body p { margin: 0 0 1.05rem; }

.contact-line {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- news ---------- */

.news {
  max-height: 22rem;
  overflow-y: auto;
  padding-right: 0.4rem;
}

.news table {
  width: 100%;
  border-collapse: collapse;
}

.news td {
  padding: 0.5rem 0.2rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.news tr:last-child td { border-bottom: 0; }

.news .news__date {
  width: 7.5rem;
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- publications ---------- */

.pub-list { margin-top: 0.6rem; }

.pub {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 1.4rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border);
}

.pub:last-child { border-bottom: 0; }

.pub__thumb {
  position: relative;
  align-self: start;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.pub__thumb img {
  width: 100%;
  height: 118px;
  object-fit: contain;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 3px;
}

.pub__badge {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pub__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.03rem;
  line-height: 1.4;
  margin: 0 0 0.25rem;
}

.pub__authors { margin: 0 0 0.1rem; font-size: 0.95rem; }
.pub__authors .me { font-weight: 700; }

.pub__venue {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-style: italic;
}

.pub__note { color: var(--text-muted); font-size: 0.88rem; }

.pub__links { margin-top: 0.55rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }

.pub__links a {
  display: inline-block;
  padding: 0.12rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.pub__links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- simple entry lists (teaching, cv-ish sections) ---------- */

.entry-list { list-style: none; margin: 0.4rem 0 0; padding: 0; }

.entry-list > li {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}

.entry-list > li:last-child { border-bottom: 0; }

.entry-list .entry__when {
  color: var(--text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.entry__what { margin: 0; }
.entry__what strong { font-weight: 700; }

.entry__meta {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.tag-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0 0; padding: 0; list-style: none; }

.tag-row li {
  padding: 0.1rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.site-footer__inner {
  max-width: 940px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem 2rem;
  color: var(--text-muted);
  font-size: 0.86rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
}

.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .profile {
    float: none;
    width: 190px;
    margin: 0 auto 1.4rem;
  }

  .pub { grid-template-columns: 1fr; gap: 0.7rem; }
  .pub__thumb { max-width: 260px; }
  .entry-list > li { grid-template-columns: 1fr; gap: 0.15rem; }
  h1 { font-size: 1.8rem; }
  .site-nav__inner { padding: 0.6rem 1rem; gap: 0.5rem; }
  .site-nav__links { gap: 0.1rem; }
  .site-nav__links a { padding: 0.25rem 0.4rem; font-size: 0.9rem; }
  .page { padding: 1.8rem 1.15rem 2.4rem; }
}