/* Ali Habiboglu - personal research site
   Layout: fixed left rail, single measured column.
   Structure: hairline rules act as layer interfaces, echoing thin-film stacks. */

:root {
  --ink: #0c234b;
  --ink-soft: #41547a;
  --ink-faint: #6c7b98;
  --paper: #ffffff;
  --surface: #eef1f7;
  --rule: #ccd5e4;
  --accent: #ab0520;
  --accent-soft: #f2dfe2;
  --sans: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --measure: 68ch;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  font-weight: 400;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 0.9rem;
  z-index: 20;
}

/* ---------- shell ---------- */

.shell {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3.5rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 3.5rem 2rem 5rem;
}

.rail { position: relative; }

.rail-inner {
  position: sticky;
  top: 3.5rem;
}

.namemark {
  font-family: var(--serif);
  font-size: 1.55rem;
  line-height: 1.15;
  font-weight: 500;
  margin: 0 0 0.35rem;
  letter-spacing: -0.01em;
}

.namemark a { text-decoration: none; }

.rolemark {
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.45;
  margin: 0 0 1.5rem;
}

.nav { border-top: 2px solid var(--ink); }

.nav a {
  display: block;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  font-size: 0.94rem;
}

.nav a:hover { color: var(--accent); }

.nav a.here {
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--accent);
  padding-left: 0.7rem;
}

.rail-contact {
  margin-top: 1.6rem;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.rail-contact a { color: var(--ink-soft); }

/* ---------- content ---------- */

main { max-width: var(--measure); }

h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 2.5rem;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 1.1rem;
}

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.5rem;
  line-height: 1.25;
  margin: 0 0 0.9rem;
  padding-top: 0.7rem;
  border-top: 2px solid var(--ink);
}

h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.35;
  margin: 0 0 0.35rem;
}

p { margin: 0 0 1.1rem; }

.lede {
  font-size: 1.16rem;
  line-height: 1.55;
  color: var(--ink);
}

section { margin-bottom: 3.2rem; }

.sub {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin: -0.2rem 0 1.4rem;
}

/* ---------- hero figure ---------- */

.figure {
  margin: 0 0 2.6rem;
  padding: 1.4rem 1.4rem 1rem;
  background: var(--surface);
}

.figure svg { display: block; width: 100%; height: auto; }

.figure figcaption {
  font-size: 0.8rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin-top: 0.8rem;
  max-width: 46ch;
}

.svg-label { font-family: var(--sans); font-size: 11px; fill: var(--ink-soft); }
.svg-label-strong { font-family: var(--sans); font-size: 11px; font-weight: 600; fill: var(--ink); }

/* ---------- entries ---------- */

.entry {
  border-top: 1px solid var(--rule);
  padding: 1.15rem 0;
}

.entry:last-child { border-bottom: 1px solid var(--rule); }

.entry p { margin: 0.35rem 0 0; }

.entry .meta {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin: 0.15rem 0 0;
}

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

.stack-list li {
  border-top: 1px solid var(--rule);
  padding: 0.85rem 0;
}

.stack-list li:last-child { border-bottom: 1px solid var(--rule); }

.dated {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 0 1.2rem;
}

.dated .when {
  font-size: 0.85rem;
  color: var(--ink-faint);
  padding-top: 0.15rem;
}

.numbered { padding-left: 1.4rem; margin: 0; }

.numbered li {
  margin-bottom: 1.05rem;
  padding-left: 0.3rem;
}

.numbered li::marker {
  color: var(--ink-faint);
  font-size: 0.85rem;
}

.cite-title { font-weight: 600; }

.authors { color: var(--ink-soft); font-size: 0.93rem; }

.venue { font-style: italic; }

.self { font-weight: 600; color: var(--ink); }

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

.plain li { margin-bottom: 0.5rem; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0 0 1.2rem;
  list-style: none;
}

.tags li {
  font-size: 0.83rem;
  padding: 0.2rem 0.6rem;
  background: var(--surface);
  color: var(--ink-soft);
}

.note {
  border-left: 3px solid var(--accent);
  padding: 0.1rem 0 0.1rem 1rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

footer.foot {
  grid-column: 1 / -1;
  border-top: 1px solid var(--rule);
  padding-top: 1.2rem;
  margin-top: 1.5rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

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

@media (max-width: 860px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
    padding: 2rem 1.3rem 3.5rem;
  }
  .rail-inner { position: static; }
  .nav { display: flex; flex-wrap: wrap; gap: 0 1.1rem; border-bottom: 2px solid var(--ink); }
  .nav a { border-bottom: none; padding: 0.5rem 0; }
  .nav a.here { box-shadow: none; padding-left: 0; text-decoration: underline; text-decoration-color: var(--accent); }
  .rail-contact { display: none; }
  h1 { font-size: 2rem; }
  .dated { grid-template-columns: minmax(0, 1fr); gap: 0.15rem; }
  body { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

@media print {
  .rail, .figure { display: none; }
  .shell { display: block; padding: 0; }
  body { font-size: 11pt; color: #000; }
  a { text-decoration: none; color: #000; }
  h2 { border-top: 1px solid #000; }
}

/* ---------- added for the CV-based pages ---------- */

.figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}

.cols {
  columns: 2;
  column-gap: 2.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.cols li {
  break-inside: avoid;
  padding: 0.22rem 0 0.22rem 0.85rem;
  position: relative;
  color: var(--ink-soft);
}

.cols li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 5px;
  height: 1px;
  background: var(--accent);
}

.status {
  color: var(--accent);
  font-weight: 500;
}

.numbered .authors { display: block; }
.numbered .cite-title { display: block; margin: 0.1rem 0; }

.mentees li { margin-bottom: 1.5rem; }

.mentee-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.2rem;
}

.mentee-head .when {
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.sub-bullets { margin-top: 0.5rem; font-size: 0.95rem; }
.sub-bullets li { margin-bottom: 0.3rem; }

.lbl {
  color: var(--ink-faint);
  font-size: 0.8rem;
  display: inline-block;
  min-width: 4.6rem;
}

@media (max-width: 860px) {
  .cols { columns: 1; }
  .lbl { min-width: 0; margin-right: 0.35rem; }
}

/* ---------- projects page ---------- */

.projects > li { margin-bottom: 1.8rem; }
.projects h3 { margin: 0 0 0.15rem; }
.projects .meta { margin: 0 0 0.4rem; }
.projects .sub-bullets li {
  padding-left: 0.85rem;
  position: relative;
}
.projects .sub-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 5px;
  height: 1px;
  background: var(--rule-strong, #0c234b);
}