/* =========================================================
   zvihrosen.com — shared stylesheet
   Refined academic: warm cream, Source Serif 4 + Inter,
   ink blue accent, generous whitespace.
   ========================================================= */

:root {
  --bg: #EEF3FB;
  --surface: #FFFFFF;
  --surface-2: #DDE6F3;
  --ink: #14181F;
  --ink-2: #2E3645;
  --muted: #6B7689;
  --border: #D2DCEC;
  --border-strong: #B2C0D6;
  --accent: #2C4A6B;       /* deep ink blue */
  --accent-hover: #1B3553;
  --accent-soft: #DCE6F4;

  --maxw: 880px;
  --maxw-wide: 1100px;

  --radius: 4px;
  --radius-lg: 10px;

  --shadow-sm: 0 1px 0 rgba(28, 26, 22, 0.04);
  --shadow-md: 0 6px 20px -8px rgba(28, 26, 22, 0.18);

  --serif: "Source Serif 4", "Source Serif Pro", "Palatino", "Georgia", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  font-feature-settings: "ss01", "kern";
}

/* ---------- Layout containers ---------- */

.site {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
  width: 100%;
}

.wrap--wide {
  max-width: var(--maxw-wide);
}

main {
  flex: 1;
  padding: 56px 0 96px;
}

section + section {
  margin-top: 64px;
}

/* ---------- Top nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 90%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav.is-scrolled {
  border-bottom-color: var(--border);
}

.nav__inner {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav__brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.nav__brand-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
  transform: translateY(-1px);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 450;
}

.nav__links a {
  color: var(--ink-2);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius);
  position: relative;
  transition: color 0.15s ease, background-color 0.15s ease;
}

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

.nav__links a.is-current {
  color: var(--ink);
  font-weight: 550;
}

.nav__links a.is-current::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
}

.nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-2);
}

@media (max-width: 720px) {
  .nav__toggle { display: inline-flex; align-items: center; gap: 6px; }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    right: 16px;
    left: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    flex-direction: column;
    align-items: stretch;
    padding: 8px;
    gap: 0;
    box-shadow: var(--shadow-md);
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 10px 12px; }
  .nav__links a.is-current::after { display: none; }
  .nav__links a.is-current { background: var(--accent-soft); color: var(--accent); }
}

/* ---------- Typography ---------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(40px, 6vw, 64px); font-weight: 600; letter-spacing: -0.025em; }
h2 { font-size: 32px; margin-top: 0; }
h3 { font-size: 22px; font-weight: 600; margin-top: 0; }
h4 { font-size: 18px; font-weight: 600; }
h5 { font-size: 16px; font-style: italic; font-weight: 500; }

.eyebrow {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 12px;
}

.section-title {
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

p {
  margin: 0 0 1em;
  text-wrap: pretty;
  max-width: 68ch;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

strong, b { font-weight: 600; color: var(--ink); }
em, i { font-style: italic; }

ul, ol {
  padding-left: 22px;
  margin: 0 0 1em;
}

li { margin-bottom: 6px; }
li > ul, li > ol { margin-top: 6px; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

img { max-width: 100%; height: auto; display: block; }

/* ---------- Hero (home + page headers) ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  column-gap: 64px;
  row-gap: 56px;
  align-items: start;
  padding: 32px 0 16px;
}

.hero__name {
  font-size: clamp(48px, 7.5vw, 84px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 0 0 20px;
}

.hero__role {
  font-family: var(--sans);
  font-size: 16px;
  color: var(--muted);
  font-weight: 450;
  margin: 0 0 32px;
  line-height: 1.55;
}

.hero__role b { color: var(--ink-2); font-weight: 550; }

.hero__role .gap { display: block; height: 14px; }

.hero__portrait {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  box-shadow: var(--shadow-sm);
  max-width: 340px;
  justify-self: end;
  width: 100%;
}

.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.hero__portrait:hover img { transform: scale(1.02); }

@media (max-width: 720px) {
  .hero {
    grid-template-columns: 1fr;
    column-gap: 0;
    row-gap: 32px;
    padding-top: 8px;
  }
  .hero__portrait { aspect-ratio: 4 / 3; max-height: 360px; max-width: 100%; justify-self: stretch; }
}

/* Bottom-row columns on the home grid */
.hero__col {
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.hero__heading {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 16px;
}

/* Page header (non-home pages) */
.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding: 24px 0 36px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

.page-header__title h1 {
  font-size: clamp(40px, 5.5vw, 56px);
  margin: 0;
}

.page-header__title .eyebrow { margin-bottom: 8px; }

/* ---------- Contact / icon row ---------- */

.icon-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.icon-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 10px;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.icon-row a:hover {
  color: var(--accent);
  background: var(--surface);
  border-color: var(--border);
  text-decoration: none;
  transform: translateY(-1px);
}

.icon-row a i, .icon-row a svg {
  font-size: 24px;
  padding: 0;
}

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

.pub {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 28px;
  padding: 22px 0;
}

.pub__thumb {
  border-radius: 6px;
  overflow: hidden;
  background: var(--surface-2);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.pub:hover .pub__thumb img { transform: scale(1.04); }

.pub__title {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.pub__authors {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 10px;
  line-height: 1.5;
}

.pub__authors em { color: var(--ink-2); font-style: normal; }

.pub__abstract {
  font-size: 15.5px;
  color: var(--ink-2);
  margin: 0 0 12px;
  line-height: 1.55;
  max-width: none;
}

.pub__meta {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
}

.pub__meta .venue { color: var(--ink-2); }

.pub__meta .badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 550;
  background: var(--accent-soft);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pub__links {
  display: inline-flex;
  gap: 10px;
  margin-left: auto;
  font-family: var(--sans);
  font-size: 13.5px;
}

.pub__links a {
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink-2);
  background: transparent;
  transition: all 0.15s ease;
}

.pub__links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface);
  text-decoration: none;
}

@media (max-width: 720px) {
  .pub { grid-template-columns: 80px 1fr; gap: 16px; padding: 22px 0; }
  .pub__title { font-size: 17px; }
  .pub__links { margin-left: 0; }
}

/* ---------- Tables (teaching) ---------- */

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15.5px;
}

.table tr {
  transition: background 0.15s ease;
}

.table tr:hover { background: var(--surface); }

.table td {
  padding: 14px 16px;
  vertical-align: top;
}

.table td:first-child {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  width: 130px;
  white-space: nowrap;
  padding-top: 17px;
  font-weight: 550;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.table td:nth-child(3) {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--muted);
  width: 110px;
}

.table td:nth-child(4) {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--muted);
  width: 220px;
}

.table .course-code {
  font-weight: 600;
  color: var(--ink);
}

@media (max-width: 720px) {
  .table td { padding: 12px 8px; font-size: 14.5px; }
  .table td:first-child { width: auto; padding-right: 12px; }
  .table td:nth-child(3), .table td:nth-child(4) { display: none; }
}

/* ---------- Two-column blocks ---------- */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; gap: 32px; }
}

.col h4 {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.col ul, .col ol { padding-left: 18px; }

.col .lead {
  font-family: var(--serif);
  font-size: 16px;
  font-style: italic;
  color: var(--ink-2);
}

/* ---------- Event list ---------- */

.events {
  list-style: none;
  padding: 0;
  margin: 0;
}

.events > li {
  padding: 12px 0;
  font-size: 16px;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  align-items: baseline;
}

.events .date {
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 550;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
  padding-top: 3px;
}

.events .detail ul {
  font-size: 14.5px;
  font-family: var(--sans);
  color: var(--muted);
  margin: 6px 0 0;
  padding-left: 18px;
}

@media (max-width: 720px) {
  .events > li { grid-template-columns: 1fr; gap: 4px; }
}

/* ---------- Education / positions list (about) ---------- */

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline > li {
  padding: 14px 0;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 28px;
}

.timeline .when {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 550;
}

.timeline .what { font-size: 16px; }
.timeline .what .role { font-weight: 600; }
.timeline .what .place {
  display: block;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  margin-top: 2px;
}

@media (max-width: 720px) {
  .timeline > li { grid-template-columns: 1fr; gap: 4px; }
}

/* ---------- Notes & Code grouped lists ---------- */

.note-list { list-style: none; padding: 0; margin: 0; }

.note-list > li {
  padding: 10px 0;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  align-items: baseline;
}

.note-list .term { white-space: nowrap; }

.note-list .term {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 550;
}

.note-list .what .title { font-weight: 600; }
.note-list .what .meta {
  display: block;
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--muted);
  margin-top: 2px;
}

@media (max-width: 720px) {
  .note-list > li { grid-template-columns: 1fr; gap: 4px; }
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  background: var(--surface);
}

.footer__inner {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer a { color: var(--ink-2); text-decoration: none; }
.footer a:hover { color: var(--accent); text-decoration: underline; }

.footer__dept { max-width: 60ch; }

/* ---------- Misc utilities ---------- */

.muted { color: var(--muted); }
.center { text-align: center; }
.lead-text { font-size: 18.5px; line-height: 1.6; color: var(--ink-2); max-width: 65ch; }

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.gif-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.gif-row img {
  width: 220px;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* Subtle entrance for content */
@media (prefers-reduced-motion: no-preference) {
  main > * {
    animation: fadeUp 0.5s ease both;
  }
  main > *:nth-child(2) { animation-delay: 0.05s; }
  main > *:nth-child(3) { animation-delay: 0.1s; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}