/* ==========================================================================
   Madjid Sadallah — Academic Site
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #fff;
  --bg-alt: #f7f7f8;
  --text: #111;
  --text-secondary: #555;
  --text-muted: #888;
  --text-faint: #bbb;
  --accent: #1a3a5c;
  --accent-light: #2a5a8c;
  --accent-bg: rgba(26, 58, 92, 0.04);
  --border: #e5e5e5;
  --border-light: #eee;
  --border-faint: #f3f3f3;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --mono: 'SF Mono', 'JetBrains Mono', Consolas, monospace;
  --content: 700px;
  --wide: 1000px;
  --ultra: 1160px;
  --nav-h: 52px;
  --ease: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; transition: color var(--ease); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
::selection { background: var(--accent); color: #fff; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- NAV ---- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-faint);
}
.nav__inner {
  max-width: var(--ultra);
  margin: 0 auto;
  padding: 0 2.5rem;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
}
.nav__brand {
  font-family: var(--sans); font-weight: 600; font-size: 0.8125rem;
  color: var(--text); letter-spacing: -0.02em;
  transition: opacity var(--ease);
}
.nav__brand:hover { opacity: 0.5; color: var(--text); }
.nav__links { display: flex; gap: 0.125rem; align-items: center; }
.nav__link {
  font-family: var(--sans); font-size: 0.75rem; font-weight: 500;
  color: var(--text-muted); padding: 0.375rem 0.75rem;
  border-radius: 100px; transition: all var(--ease);
}
.nav__link:hover { color: var(--text); background: var(--bg-alt); }
.nav__toggle {
  display: none; background: none; border: none; cursor: pointer;
  color: var(--text); padding: 0.5rem; border-radius: 5px;
}
.nav__toggle:hover { background: var(--bg-alt); }

@media (max-width: 768px) {
  .nav__toggle { display: block; }
  .nav__links {
    display: none; position: absolute; top: var(--nav-h);
    left: 0; right: 0; background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 0.5rem 1rem;
    animation: slideDown 0.3s ease both;
  }
  .nav__links--open { display: flex; }
  .nav__link { padding: 0.75rem 1rem; width: 100%; border-radius: 5px; }
}

/* ---- LAYOUT ---- */
.main { padding-top: var(--nav-h); }

.page {
  max-width: var(--content);
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
}
.page--wide { max-width: var(--wide); }

/* ---- TYPOGRAPHY ---- */
h1, h2, h3, h4 {
  font-family: var(--sans); font-weight: 600;
  letter-spacing: -0.025em; line-height: 1.25; color: var(--text);
}
h1 { font-size: 2rem; margin-bottom: 1.5rem; letter-spacing: -0.035em; }
h2 {
  font-size: 1.25rem; margin-top: 3.5rem; margin-bottom: 1.25rem;
  padding-bottom: 0.625rem; border-bottom: 1px solid var(--border-light);
}
h3 { font-size: 1rem; margin-top: 2.25rem; margin-bottom: 0.75rem; }
h4 { font-size: 0.9375rem; margin-top: 1.75rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1.375rem; }
strong { font-weight: 600; }
em { font-style: italic; }
small { font-size: 0.85em; color: var(--text-secondary); }
ul, ol { margin-bottom: 1.375rem; padding-left: 1.25rem; }
li { margin-bottom: 0.5rem; line-height: 1.7; }
hr { border: none; border-top: 1px solid var(--border); margin: 3.5rem 0; }

/* ---- CONTENT LINKS ---- */
.page p a, .page li a {
  text-decoration: underline;
  text-decoration-color: rgba(26,58,92,0.15);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.page p a:hover, .page li a:hover { text-decoration-color: var(--accent); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-family: var(--sans); font-size: 0.6875rem; font-weight: 600;
  letter-spacing: 0.04em; padding: 0.35em 0.75em;
  border-radius: 100px; border: 1px solid transparent;
  cursor: pointer; transition: all var(--ease);
  text-decoration: none !important; text-transform: uppercase; line-height: 1.5;
}
.btn--primary {
  background: var(--accent); border-color: var(--accent); color: #fff !important;
}
.btn--primary:hover {
  background: var(--accent-light); border-color: var(--accent-light); color: #fff !important;
}
.btn--outline {
  background: transparent; border-color: var(--border); color: var(--text-secondary) !important;
}
.btn--outline:hover {
  border-color: var(--accent); color: var(--accent) !important; background: var(--accent-bg);
}
.btn--large { font-size: 0.75rem; padding: 0.55em 1.5em; text-transform: none; }

/* ---- PUBLICATIONS ---- */
.pub-year {
  font-family: var(--sans); font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--accent);
  margin-top: 2.5rem; margin-bottom: 1rem;
  padding-bottom: 0.5rem; padding-left: 0;
  border-bottom: 2px solid var(--accent);
  display: block;
}
.pub-year:first-child { margin-top: 0; }

.pub-item {
  padding: 1rem 0;
  margin: 0;
  border-bottom: 1px solid var(--border-light);
}
.pub-item:first-of-type { padding-top: 0; }

.pub-item:last-child { border-bottom: none; }

.pub-item p {
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text);
}

/* Bold authors, normal title */
.pub-item p:first-child strong {
  font-weight: 600;
}

.pub-item p:first-child em {
  font-style: italic;
  font-weight: 400;
}

/* Buttons */
.pub-item .btn {
  margin-top: 0.25rem;
  margin-right: 0.375rem;
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
}

/* Abstract/Bibtex toggle boxes */
.pub-abstract, .pub-bibtex {
  margin-top: 0.75rem;
  padding: 0.875rem 1rem;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  font-size: 0.875rem;
  line-height: 1.6;
}
.pub-abstract p { margin-bottom: 0; }
.pub-abstract strong { color: var(--accent); }
.pub-bibtex { background: #f4f4f4; }
.pub-bibtex pre { margin: 0; background: transparent; }

/* Abstract toggle divs */
.pub-container div[id*="_abstract"],
.pub-container div[id*="_bibtex"] {
  display: none;
  margin: 0.5rem 0 0.5rem 0;
  padding: 0.875rem 1rem;
  background: #f8f8fa;
  border-radius: 6px;
  border: 1px solid #eee;
  font-size: 0.85rem;
  line-height: 1.7;
}
}

.pub-container div[id*="_abstract"] .notice--info,
.pub-container div[id*="_bibtex"] .notice--info {
  padding: 0; margin: 0; background: none; border: none;
}

.pub-container div[id*="_abstract"] strong,
.pub-container div[id*="_bibtex"] strong {
  font-family: var(--sans); font-size: 0.65rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent); font-weight: 700;
}

/* BibTeX code blocks */
.highlighter-rouge { margin: 0.5rem 0 0 0; }
.highlighter-rouge pre {
  margin: 0; font-family: var(--mono); font-size: 0.75rem;
  line-height: 1.7; overflow-x: auto; white-space: pre;
  color: var(--text-secondary); background: var(--bg);
  padding: 0.75rem 1rem; border-radius: 5px;
  border: 1px solid var(--border-light);
}

/* ---- CODE ---- */
code {
  font-family: var(--mono); font-size: 0.825em;
  background: var(--bg-alt); padding: 0.15em 0.4em; border-radius: 4px;
}
pre {
  background: var(--bg-alt); padding: 1.25rem 1.5rem;
  border-radius: 8px; overflow-x: auto; margin-bottom: 1.5rem;
  border: 1px solid var(--border-light);
}
pre code { background: none; padding: 0; font-size: 0.775rem; line-height: 1.75; }

/* ---- BADGES ---- */
.badge, .badge-journal {
  display: inline-block; font-family: var(--sans);
  font-size: 0.625rem; font-weight: 600; letter-spacing: 0.06em;
  padding: 0.2em 0.6em; border-radius: 100px;
  text-transform: uppercase; background: var(--bg-alt); color: var(--text-secondary);
}

/* ---- PROJECT CARDS (2-col grid) ---- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}
.project-card {
  display: flex; flex-direction: column;
  padding: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  transition: all var(--ease);
}
.project-card:hover {
  border-color: var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.04);
  transform: translateY(-2px);
}
.project-card__image {
  width: 100%; height: 100px; object-fit: cover;
  border-radius: 5px; background: var(--bg-alt); margin-bottom: 0.875rem;
}
.project-card__title {
  font-family: var(--sans); font-size: 0.875rem; font-weight: 600;
  margin-bottom: 0.375rem; letter-spacing: -0.015em; line-height: 1.3;
}
.project-card__title a { color: var(--text); text-decoration: none; }
.project-card__title a:hover { color: var(--accent); }
.project-card__excerpt {
  font-family: var(--serif); font-size: 0.825rem;
  color: var(--text-secondary); line-height: 1.6;
  margin-bottom: 0.625rem; flex-grow: 1;
}
.project-card__link {
  font-family: var(--sans); font-size: 0.6875rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--accent); text-decoration: none;
}
.project-card__link:hover { opacity: 0.7; text-decoration: none; }

@media (max-width: 700px) {
  .projects-grid { grid-template-columns: 1fr; }
}

/* ---- TALK CARDS ---- */
.talks-list {
  display: flex; flex-direction: column; gap: 0.5rem; margin-top: 2.5rem;
}
.talk-card {
  display: grid; grid-template-columns: 56px 1fr; gap: 0.875rem;
  padding: 0.875rem 1rem;
  background: var(--bg); border: 1px solid var(--border-light);
  border-radius: 8px; transition: all var(--ease);
}
.talk-card:hover {
  border-color: var(--border); box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}
.talk-card__image {
  width: 56px; height: 40px; object-fit: cover;
  border-radius: 5px; background: var(--bg-alt);
}
.talk-card__title {
  font-family: var(--sans); font-size: 0.8125rem; font-weight: 600;
  margin-bottom: 0.125rem; letter-spacing: -0.01em;
}
.talk-card__meta {
  font-family: var(--sans); font-size: 0.6875rem;
  color: var(--text-faint); margin-bottom: 0.25rem;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.talk-card__excerpt {
  font-family: var(--serif); font-size: 0.8rem;
  color: var(--text-secondary); line-height: 1.6;
}
.talk-card__actions { display: flex; gap: 0.375rem; margin-top: 0.5rem; }

@media (max-width: 600px) {
  .talk-card { grid-template-columns: 1fr; }
  .talk-card__image { width: 100%; height: 80px; }
}

/* ---- THESIS CARDS ---- */
.thesis-list {
  display: flex; flex-direction: column; gap: 0.75rem; margin-top: 2.5rem;
}
.thesis-card {
  padding: 1.5rem;
  background: var(--bg); border: 1px solid var(--border-light);
  border-radius: 8px; transition: all var(--ease);
}
.thesis-card:hover { border-color: var(--border); box-shadow: 0 4px 20px rgba(0,0,0,0.03); }
.thesis-card__image {
  width: 100%; max-width: 280px; border-radius: 5px; margin-bottom: 1rem;
}
.thesis-card__title {
  font-family: var(--sans); font-size: 0.9375rem; font-weight: 600;
  margin-bottom: 0.5rem; letter-spacing: -0.015em;
}
.thesis-card__meta {
  font-family: var(--serif); font-size: 0.85rem;
  color: var(--text-secondary); line-height: 1.7;
}
.thesis-card__meta dt {
  font-family: var(--sans); font-weight: 600; color: var(--text);
  display: inline; font-size: 0.8rem;
}
.thesis-card__meta dd { display: inline; margin-left: 0.25rem; }

/* ---- TEACHING ---- */
.teaching-entry {
  margin-bottom: 3rem; padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-light);
}
.teaching-entry:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.teaching-entry__title {
  font-family: var(--sans); font-size: 1.0625rem; font-weight: 600;
  margin-bottom: 0.25rem; letter-spacing: -0.02em;
}
.teaching-entry__meta {
  font-family: var(--sans); font-size: 0.75rem;
  color: var(--text-faint); margin-bottom: 1rem;
  text-transform: uppercase; letter-spacing: 0.04em;
}

/* ---- ACTIVITIES ---- */
.activity-entry {
  margin-bottom: 2rem; padding-left: 1.25rem;
  border-left: 2px solid var(--border-light);
  transition: border-color var(--ease);
}
.activity-entry:hover { border-left-color: var(--accent); }
.activity-entry:last-child { margin-bottom: 0; }
.activity-entry__title {
  font-family: var(--sans); font-size: 0.875rem; font-weight: 600;
  margin-bottom: 0.25rem; letter-spacing: -0.01em;
}
.activity-entry__role {
  font-family: var(--sans); font-size: 0.6875rem; font-weight: 600;
  color: var(--accent); text-transform: uppercase;
  letter-spacing: 0.06em; margin-bottom: 0.5rem;
}
.activity-entry__desc {
  font-family: var(--serif); font-size: 0.875rem;
  color: var(--text-secondary); line-height: 1.75;
}

/* ---- AUTHOR PROFILE ---- */
.author-profile {
  display: flex; gap: 1.5rem; align-items: flex-start;
  margin-bottom: 3rem; padding: 1.75rem;
  background: var(--bg-alt); border: 1px solid var(--border-light);
  border-radius: 8px;
}
.author-profile__avatar {
  width: 88px; height: 88px; border-radius: 50%; object-fit: cover;
  border: 2px solid var(--bg); box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  flex-shrink: 0;
}
.author-profile__name {
  font-family: var(--sans); font-size: 1.125rem; font-weight: 700;
  letter-spacing: -0.025em; margin-bottom: 0.125rem;
}
.author-profile__bio {
  font-family: var(--sans); font-size: 0.8125rem;
  color: var(--text-secondary); margin-bottom: 0.375rem;
}
.author-profile__location {
  font-family: var(--sans); font-size: 0.75rem;
  color: var(--text-faint); margin-bottom: 0.875rem;
  display: flex; align-items: center; gap: 0.375rem;
}
.author-profile__social { display: flex; gap: 1rem; flex-wrap: wrap; }
.author-profile__social a {
  font-family: var(--sans); font-size: 0.75rem;
  color: var(--text-secondary); display: flex;
  align-items: center; gap: 0.3rem; font-weight: 500;
}
.author-profile__social a:hover { color: var(--accent); }

@media (max-width: 600px) {
  .author-profile {
    flex-direction: column; align-items: center; text-align: center;
  }
  .author-profile__location { justify-content: center; }
  .author-profile__social { justify-content: center; }
}

/* ---- FOOTER ---- */
.footer {
  border-top: 1px solid var(--border-light);
  background: var(--bg-alt);
}
.footer__inner {
  max-width: var(--ultra); margin: 0 auto;
  padding: 2rem 2.5rem;
  display: flex; justify-content: space-between; align-items: center;
}
.footer__copy {
  font-family: var(--sans); font-size: 0.6875rem;
  color: var(--text-faint); letter-spacing: 0.01em;
}
.footer__links { display: flex; gap: 1.25rem; }
.footer__links a {
  font-family: var(--sans); font-size: 0.6875rem;
  color: var(--text-faint); transition: color var(--ease);
}
.footer__links a:hover { color: var(--accent); }

@media (max-width: 600px) {
  .footer__inner { flex-direction: column; gap: 1rem; text-align: center; }
}

/* ---- HERO ---- */
.hero {
  padding: 7rem 2rem 3.5rem;
  max-width: var(--content);
  margin:0 auto;
  text-align: center;
}
.hero__name {
  font-family: var(--sans); font-size: 2.75rem; font-weight: 700;
  letter-spacing: -0.04em; margin-bottom: 0.5rem; line-height: 1.1;
  color: var(--text);
}
.hero__tagline {
  font-family: var(--serif); font-size: 1.0625rem;
  color: var(--text-secondary); font-weight: 400; font-style: italic;
}

/* ---- DETAIL HEADER ---- */
.detail-header {
  margin-bottom: 2.5rem; padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}
.detail-header__title {
  font-size: 1.75rem; font-weight: 700;
  letter-spacing: -0.035em; margin-bottom: 0.375rem;
}
.detail-header__meta {
  font-family: var(--sans); font-size: 0.8125rem;
  color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em;
}

/* ---- UTILITY ---- */
.text-muted { color: var(--text-faint); }
.text-secondary { color: var(--text-secondary); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

.link-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.link-list li { margin-bottom: 0; }

/* ---- COMPATIBILITY ---- */
.notice--info { margin: 0; padding: 0; background: none; border: none; font-size: inherit; line-height: inherit; }
a[style*="color:white"].btn { color: inherit !important; }
a[style*="color:white"].btn--primary { color: #fff !important; }
a[style*="cursor: pointer"].btn { cursor: pointer !important; }