/* ==========================================================================
   Omar Al Humsi: academic website
   Plain HTML and CSS: no JavaScript, no web fonts, no frameworks.
   To restyle the site, edit the tokens in :root only.
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f6f9;
  --text: #1b2027;
  --text-soft: #39424e;
  --muted: #5b6573;
  --rule: #dfe3e8;
  --accent: #1f3a5f;          /* navy, same as the JMP slides */
  --accent-strong: #142a47;
  --on-accent: #ffffff;

  /* System fonts only: fast, private (no third-party requests), stable. */
  --font-text: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  --container: 54rem;
  --gutter: 1.25rem;
  --radius: 4px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --bg-soft: #181d23;
    --text: #e6e9ed;
    --text-soft: #c7ced6;
    --muted: #9ba6b2;
    --rule: #2b323b;
    --accent: #a8c7ef;
    --accent-strong: #cfe0f7;
    --on-accent: #0f1a2a;
  }
}

/* ---------- 2. Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-text);
  font-size: 1.0625rem;          /* 17px on phones */
  line-height: 1.6;
}

@media (min-width: 48rem) {
  body { font-size: 1.125rem; }  /* 18px from tablets up */
}

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

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  text-wrap: balance;
}

p, ul, dl, address { margin: 0; }

a {
  color: var(--accent);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

main:focus { outline: none; }

[id] { scroll-margin-top: 4.75rem; }

.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

@media (min-width: 48rem) {
  :root { --gutter: 2rem; }
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 20;
  padding: 0.5rem 0.85rem;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  border-radius: var(--radius);
  text-decoration: none;
}

.skip-link:focus { top: 0.75rem; }

/* ---------- 3. Header and navigation ---------- */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 48rem) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem 1.5rem;
  padding-block: 0.8rem;
}

.site-name {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

.site-name:hover { color: var(--accent); }

.site-name__icon {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 5px;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  padding: 0;
  list-style: none;
  font-family: var(--font-ui);
  font-size: 0.9375rem;
}

@media (min-width: 48rem) {
  .site-nav ul { column-gap: 1.25rem; }
}

.site-nav a {
  display: inline-block;
  padding-block: 0.2rem;
  color: var(--text-soft);
  text-decoration: none;
}

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

.site-nav .site-nav__cv {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 4. Identity block ---------- */
.intro {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: 1.25rem;
  align-items: center;
  padding-block: 1.75rem 2rem;
}

.intro__photo {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-soft);
}

.intro__head {
  grid-column: 2;
  grid-row: 1;
}

.intro__body {
  grid-column: 1 / -1;
  grid-row: 2;
}

@media (min-width: 40rem) {
  .intro {
    grid-template-columns: 14rem minmax(0, 1fr);
    column-gap: 2.5rem;
    row-gap: 1rem;
    align-items: start;
    padding-block: 2.25rem 2rem;
  }

  .intro__photo { grid-row: 1 / span 2; }

  .intro__body {
    grid-column: 2;
    grid-row: 2;
  }
}

.intro h1 {
  font-size: clamp(1.6rem, 1.1rem + 2.4vw, 2.6rem);
  letter-spacing: -0.01em;
}

.intro__role {
  margin-top: 0.4rem;
  color: var(--text-soft);
  font-family: var(--font-ui);
  font-size: 0.975rem;
  line-height: 1.45;
}

.intro__status {
  margin-top: 0.6rem;
  color: var(--accent);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
}

.intro__bio {
  max-width: 62ch;
  color: var(--text-soft);
}

.facts {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 0.2rem 1rem;
  margin-top: 1rem;
  font-size: 1rem;
}

.facts dt {
  padding-top: 0.15rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.facts dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.actions,
.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.actions { margin-top: 1.25rem; }

@media (max-width: 39.99rem) {
  .actions .btn {
    flex: 1 1 13rem;
    text-align: center;
  }
}
.paper-links { margin-top: 1rem; }

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.6rem 1rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--on-accent);
}

.btn--primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--on-accent);
}

.btn--secondary {
  background: transparent;
  color: var(--accent);
}

.btn--secondary:hover { background: var(--bg-soft); }

.btn--small {
  padding: 0.4rem 0.8rem;
  font-size: 0.875rem;
}

/* ---------- 6. Job market paper ---------- */
.jmp { padding-bottom: 2.75rem; }

.jmp__panel {
  padding: 1.4rem 1.25rem 1.5rem;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
}

@media (min-width: 40rem) {
  .jmp__panel { padding: 1.9rem 2.25rem 2rem; }
}

.label {
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.jmp__title {
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.65rem);
  line-height: 1.25;
}

.jmp__title a {
  color: var(--text);
  text-decoration: none;
}

.jmp__title a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.meta {
  margin-top: 0.4rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  line-height: 1.5;
}

.abstract {
  max-width: 68ch;
  margin-top: 1.1rem;
  color: var(--text-soft);
}

.abstract p + p { margin-top: 0.75rem; }

.presented {
  margin-top: 1.1rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  line-height: 1.55;
}

.presented__label {
  margin-right: 0.35rem;
  color: var(--text-soft);
  font-weight: 600;
}

/* ---------- 7. Sections ---------- */
.section {
  padding-block: 2.5rem;
  border-top: 1px solid var(--rule);
}

.section__title {
  margin-bottom: 1.25rem;
  font-size: 1.45rem;
}

.section__note {
  margin: -0.6rem 0 1rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.subhead {
  margin: 2rem 0 0.8rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section__title + .subhead { margin-top: 0; }

.section--plain { border-top: 0; }

.paper + .paper { margin-top: 1.5rem; }

.paper__title {
  font-size: 1.15rem;
  line-height: 1.35;
}

.paper__summary {
  max-width: 68ch;
  margin-top: 0.5rem;
  color: var(--text-soft);
}

/* CV-style list: date column + content (presentations, teaching, education) */
.cv-list {
  padding: 0;
  list-style: none;
}

.cv-list > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.1rem;
  padding-block: 0.75rem;
  border-top: 1px solid var(--rule);
}

.cv-list > li:first-child {
  padding-top: 0;
  border-top: 0;
}

@media (min-width: 40rem) {
  .cv-list > li {
    grid-template-columns: 7.75rem minmax(0, 1fr);
    column-gap: 1.25rem;
  }
}

.cv-list__date {
  padding-top: 0.2rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.cv-list__detail {
  display: block;
  color: var(--text-soft);
  font-size: 0.95em;
}

cite { font-style: italic; }

/* References */
.refs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1.25rem 2rem;
  padding: 0;
  list-style: none;
}

.refs > li {
  padding-top: 0.8rem;
  border-top: 2px solid var(--accent);
}

.ref__name { font-weight: 700; }

.ref__role {
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.5;
}

.ref__email {
  margin-top: 0.3rem;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

/* Contact */
.contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem 2rem;
}

address { font-style: normal; }

.contact__links {
  padding: 0;
  list-style: none;
}

.contact__links li + li { margin-top: 0.3rem; }

/* ---------- 8. Footer ---------- */
.site-footer {
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

/* ---------- 9. Print: a clean one-column handout ---------- */
@media print {
  :root {
    --bg: #ffffff;
    --bg-soft: #ffffff;
    --text: #000000;
    --text-soft: #000000;
    --muted: #333333;
    --rule: #bbbbbb;
    --accent: #000000;
  }

  body { font-size: 10.5pt; }

  .skip-link,
  .site-nav,
  .actions,
  .paper-links { display: none; }

  .site-header { position: static; }

  .intro { grid-template-columns: 2.6cm minmax(0, 1fr); padding-block: 0.4cm; }

  .jmp__panel {
    padding: 0;
    border: 0;
  }

  .section { padding-block: 0.5cm; }

  .paper,
  .cv-list > li,
  .refs > li { break-inside: avoid; }

  a { text-decoration: none; }
}