/* =========================================================
   Onur Deniz Akan — Unified site CSS
   ========================================================= */

/* ---------- Theme variables ---------- */
:root {
  --container-w: 960px;
  --brand: rgb(126, 32, 32);
  --bg: rgb(230, 230, 230);
  --text: rgb(50, 50, 50);
  --muted: rgb(70, 70, 70);
  --footer-h: 30px;
}

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

html {
  height: 100%;
  overflow-y: scroll;
}
body {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Tahoma", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

a {
  color: inherit;
  text-decoration: none;
}
a:focus-visible {
  outline: 2px solid rgba(0,0,0,.25);
  outline-offset: 2px;
}

/* ---------- Navigation ---------- */
nav {
  background-color: var(--brand);
  margin: 0;
  padding: 0;
}

nav ul {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  margin: 0 auto;
  padding: 35px;
  width: 100%;
  max-width: var(--container-w);
  gap: 0;
}

nav ul li {
  margin: 0 auto;
  font-size: 1.1em;
}

nav ul li a {
  color: rgb(230, 230, 230);
  display: inline-block;
  padding: 6px 8px;
}
nav ul li a:hover,
nav ul li a:focus-visible {
  text-decoration: underline;
}

/* ---------- Typography ---------- */
h1, h2, h3, p {
  margin: 0 auto;
}

h1 {
  font-size: 2em;
  line-height: 2;
  margin-top: 30px;
  margin-bottom: 5px;
}

h2 {
  font-size: 1.4em;
  line-height: 1.6;
  margin-top: 30px;
  margin-bottom: 5px;
}

h3 {
  font-size: 1.2em;
  line-height: 1.4;
  margin-top: 0;
  margin-bottom: 0;
}

p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.2;
  text-align: justify;
}

/* ---------- Main layout ---------- */
.container {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 15px;
  flex: 1 0 auto;
}

.courses-info,
.videos {
  flex: 1;
  text-align: left;
  margin-top: 10px;
}

.courses-intro {
  font-size: 15px;
  line-height: 1.5;
  color: var(--muted);
  margin-bottom: 25px;
  max-width: 720px;
}

/* ---------- Course cards (landing page) ---------- */
.course-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 10px;
  margin-bottom: 30px;
}

.course-card {
  background: #fff;
  border-left: 4px solid var(--brand);
  border-radius: 3px;
  padding: 18px 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.course-card h3 {
  font-size: 1.05em;
  color: var(--text);
  margin: 0 0 6px 0;
  line-height: 1.3;
}

.course-card .course-meta {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
  margin: 0 0 8px 0;
  text-align: left;
}

.course-card .course-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.45;
  margin: 0 0 10px 0;
  text-align: left;
}

.course-card .course-tools {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 10px 0;
  text-align: left;
}

.course-card .course-tools strong {
  color: var(--text);
}

.course-link {
  font-size: 13px;
  font-weight: bold;
  color: var(--brand);
}
.course-link:hover {
  text-decoration: underline;
}

/* ---------- Course detail pages ---------- */
.course-detail {
  flex: 1;
  text-align: left;
  margin-top: 10px;
}

.back-link {
  display: inline-block;
  font-size: 13px;
  color: var(--brand);
  margin-top: 10px;
  margin-bottom: 5px;
}
.back-link:hover {
  text-decoration: underline;
}

.course-detail h1 {
  font-size: 1.6em;
  line-height: 1.3;
  margin-top: 10px;
  margin-bottom: 5px;
}

.course-detail .course-meta {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
  text-align: left;
}

.course-detail h2 {
  font-size: 1.15em;
  margin-top: 25px;
  margin-bottom: 8px;
  line-height: 1.3;
}

.course-detail p {
  text-align: left;
  line-height: 1.5;
}

.course-objectives {
  padding-left: 20px;
  margin: 8px 0 20px 0;
  color: var(--muted);
}
.course-objectives li {
  font-size: 14px;
  margin-bottom: 8px;
  line-height: 1.4;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 25px 0;
  font-size: 13.5px;
}
.schedule-table th {
  background-color: var(--brand);
  color: #fff;
  text-align: left;
  padding: 8px 12px;
  font-weight: bold;
}
.schedule-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgb(210, 210, 210);
  vertical-align: top;
  line-height: 1.4;
  color: var(--muted);
}
.schedule-table tr:nth-child(even) td {
  background-color: rgb(242, 242, 242);
}
.schedule-table td:first-child {
  font-weight: bold;
  color: var(--text);
  white-space: nowrap;
  width: 80px;
}

.week-header {
  font-size: 1em;
  font-weight: bold;
  margin-top: 20px;
  margin-bottom: 8px;
  color: var(--text);
}

/* ---------- Footer ---------- */
.footer-wrapper {
  position: static;
  left: 0;
  bottom: 0;
  width: 100%;
  border-top: 2.5px solid var(--brand);
  background: var(--bg);
  margin-top: auto;
  height: auto;
}

.footer {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  text-align: left;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text);
}

/* ---------- Research article styles ---------- */
.article {
  flex: 1;
  text-align: left;
  margin-top: 10px;
  max-width: 100%;
}

.article h1 {
  font-size: 1.7em;
  line-height: 1.3;
  margin-top: 15px;
  margin-bottom: 4px;
}

.article .subtitle {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 4px;
  text-align: left;
}

.article .byline {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
  border-bottom: 1px solid rgb(200,200,200);
  padding-bottom: 12px;
  text-align: left;
}

.article h2 {
  font-size: 1.25em;
  margin-top: 30px;
  margin-bottom: 10px;
  line-height: 1.3;
  color: var(--brand);
}

.article h3 {
  font-size: 1.05em;
  margin-top: 20px;
  margin-bottom: 6px;
}

.article p {
  font-size: 14.5px;
  line-height: 1.7;
  margin-bottom: 12px;
  text-align: left;
  color: var(--text);
}

.article ul, .article ol {
  padding-left: 22px;
  margin-bottom: 12px;
  color: var(--text);
}
.article li {
  font-size: 14.5px;
  line-height: 1.6;
  margin-bottom: 6px;
}

/* Table of contents */
.toc {
  background: rgb(240, 240, 240);
  border-left: 4px solid var(--brand);
  padding: 14px 18px;
  margin-bottom: 25px;
  border-radius: 0 4px 4px 0;
}
.toc h3 {
  margin-top: 0;
  color: var(--brand);
  font-size: 1em;
}
.toc ol { padding-left: 18px; }
.toc li { margin-bottom: 3px; line-height: 1.5; font-size: 14px; }
.toc a { color: var(--brand); }
.toc a:hover { text-decoration: underline; }

/* Algorithm box */
.algorithm-box {
  background: rgb(248, 248, 243);
  border: 2px solid var(--brand);
  border-radius: 6px;
  padding: 18px;
  margin: 18px 0;
}
.algorithm-box h4 {
  color: var(--brand);
  margin-bottom: 10px;
  font-size: 1em;
}
.algorithm-box ol { padding-left: 18px; }
.algorithm-box li { margin-bottom: 8px; }
.step-label {
  font-weight: bold;
  color: var(--brand);
}

/* Highlight and warning boxes */
.highlight {
  background: rgb(255, 248, 225);
  border-left: 4px solid rgb(212, 120, 10);
  padding: 12px 16px;
  margin: 15px 0;
  border-radius: 0 4px 4px 0;
}
.highlight p { margin-bottom: 0; }

.warning {
  background: rgb(252, 228, 236);
  border-left: 4px solid rgb(192, 57, 43);
  padding: 12px 16px;
  margin: 15px 0;
  border-radius: 0 4px 4px 0;
}
.warning ul { margin-bottom: 0; }

/* Collapsible details */
.article details {
  background: rgb(244, 244, 244);
  border: 1px solid rgb(208, 208, 208);
  border-radius: 4px;
  padding: 10px 16px;
  margin: 12px 0;
}
.article details summary {
  cursor: pointer;
  font-weight: bold;
  color: var(--brand);
  font-size: 14px;
}
.article details[open] summary { margin-bottom: 10px; }

/* Figures */
.figure {
  margin: 18px 0;
  text-align: center;
}
.figure img {
  max-width: 100%;
  border-radius: 4px;
  border: 1px solid rgb(208, 208, 208);
}
.figure figcaption {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
  font-style: italic;
  text-align: center;
}

/* Equation annotation */
.eq-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: -6px;
  margin-bottom: 12px;
  text-align: center;
  font-style: italic;
}

/* References */
.references {
  font-size: 13px;
  border-top: 1px solid rgb(200, 200, 200);
  margin-top: 25px;
  padding-top: 12px;
}
.references li { margin-bottom: 6px; }
.references a { color: var(--brand); }

/* Research entry cards (landing page) */
.research-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 10px;
  margin-bottom: 30px;
}

.research-card {
  background: #fff;
  border-left: 4px solid var(--brand);
  border-radius: 3px;
  padding: 18px 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.research-card h3 {
  font-size: 1.05em;
  color: var(--text);
  margin: 0 0 6px 0;
  line-height: 1.3;
}

.research-card .research-meta {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
  margin: 0 0 8px 0;
  text-align: left;
}

.research-card .research-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.45;
  margin: 0;
  text-align: left;
}

.research-link {
  font-weight: bold;
  color: var(--brand);
}
.research-link:hover {
  text-decoration: underline;
}

/* ---------- Profile layout (home & about) ---------- */
.profile-section {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 15px;
  flex: 1 0 auto;
  min-height: unset;
}

.profile-text {
  flex: 1;
  text-align: left;
  font-size: 1em;
  line-height: 1.2;
  margin-top: 10px;
  padding-right: 80px;
}

/* Publications */
.pub-list {
  font-size: 1em;
  line-height: 1.2;
  color: var(--muted);
  margin: 0 auto;
  margin-top: 0;
  padding-left: 20px;
}
.pub-list li {
  font-size: 0.9em;
  margin-bottom: 15px;
  text-align: justify;
}

/* Teaching */
.teach-list {
  font-size: 1em;
  line-height: 1.2;
  color: var(--muted);
  margin: 0 auto;
  margin-top: 0;
  padding-left: 20px;
}
.teach-list li {
  font-size: 14px;
  margin-bottom: 15px;
}
.teach-list h2 {
  font-size: 15px;
  margin: 0;
  padding: 0;
  line-height: 1.2;
  font-weight: normal;
}
.teach-list h3 {
  font-size: 14px;
  margin: 0;
  padding: 0;
  line-height: 1.2;
  font-style: italic;
  font-weight: normal;
}
.teach-list p {
  font-size: 13px;
  margin: 0;
  padding: 0;
  line-height: 1.2;
  text-align: justify;
}

/* Right column */
.profile-column {
  text-align: left;
  font-size: 0.75em;
  margin-top: 30px;
  margin-bottom: 5px;
}
.profile-column h1 {
  font-size: 1.8em;
  line-height: 1;
  margin-top: 10px;
  margin-bottom: 0;
}
.profile-column h2 {
  font-size: 1em;
  line-height: 1;
  margin-top: 5px;
  margin-bottom: 0;
}

.profile-pic {
  width: 200px;
  max-width: 100%;
  height: auto;
  border-radius: 2%;
  flex-shrink: 0;
}

/* Social links */
.social-links {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 15px;
}
.social-links a {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.social-links svg {
  width: 24px;
  height: 24px;
  display: block;
}

/* CV / Curriculum */
.curriculum {
  text-align: left;
  font-size: 1.4em;
  display: flex;
  justify-content: center;
  gap: 50px;
  margin-top: 30px;
}
.curriculum a {
  color: var(--brand);
  width: 50px;
  height: 50px;
}
.curriculum svg {
  width: 45px;
  height: 45px;
  display: block;
}

/* Research highlight image (homepage right column) */
.research-pic {
  width: 300px;
  max-width: 100%;
  height: auto;
  border-radius: 2%;
}

/* News list */
.news-list {
  font-size: 1em;
  line-height: 1.2;
  color: var(--muted);
  margin: 0 auto;
  margin-top: 0;
  padding-left: 20px;
}
.news-list li {
  font-size: 14px;
  margin-bottom: 12px;
  text-align: left;
}
.news-date {
  font-weight: bold;
  color: var(--text);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .profile-text { padding-right: 20px; }
  .courses-info { padding-right: 20px; }
  .course-detail { padding-right: 20px; }
  .article { padding-right: 20px; }
}

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