/* =============================================
   Abraham Owodunni – Personal Website Styles
   Inspired by tejuadeyinka.com
   ============================================= */

/* --- Google Font: Jost (same as tejuadeyinka.com) --- */
@import url('https://fonts.googleapis.com/css2?family=Jost:wght@300;400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  --bg: #ffffff;
  --bg-muted: #f5f5f5;
  --bg-card: #ffffff;
  --text: #111111;
  --text-muted: #555555;
  --text-faint: #888888;
  --border: #e5e5e5;
  --accent: #c25e48;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --shadow: 0 2px 16px rgba(0,0,0,0.07);
  --radius: 12px;
}

[data-theme="dark"] {
  --bg: #111111;
  --bg-muted: #1a1a1a;
  --bg-card: #1e1e1e;
  --text: #f0f0f0;
  --text-muted: #aaaaaa;
  --text-faint: #666666;
  --border: #2a2a2a;
  --nav-bg: rgba(17, 17, 17, 0.92);
  --shadow: 0 2px 16px rgba(0,0,0,0.4);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Jost', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 18px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul { list-style: none; }

/* --- Layout --- */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   NAVIGATION
   ============================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav__logo {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  transition: opacity 0.2s;
}
.nav__logo:hover { opacity: 0.7; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.nav__link:hover,
.nav__link.active {
  color: var(--text);
  background: var(--bg-muted);
}

/* Dark mode toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.theme-toggle svg { width: 16px; height: 16px; }

/* Mobile nav */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s;
}

.nav__mobile {
  display: none;
  flex-direction: column;
  padding: 12px 0 16px;
  border-top: 1px solid var(--border);
  gap: 4px;
}
.nav__mobile.open { display: flex; }
.nav__mobile .nav__link {
  display: block;
  padding: 10px 16px;
}

/* =============================================
   HERO / ABOUT
   ============================================= */
.hero {
  padding: 72px 0 64px;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 64px;
  align-items: center;
}

.hero__greeting {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero__bio {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

.hero__bio a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.hero__bio a:hover { color: var(--accent); }

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero__img-wrap {
  position: relative;
}

.hero__img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

/* =============================================
   CHIPS / BADGES
   ============================================= */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-muted);
}
.chip--accent {
  background: rgba(194, 94, 72, 0.1);
  border-color: rgba(194, 94, 72, 0.3);
  color: var(--accent);
}
.chip--green {
  background: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.3);
  color: #16a34a;
}
[data-theme="dark"] .chip--green { color: #4ade80; }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  text-decoration: none;
  color: var(--text);
  background: transparent;
}
.btn:hover {
  background: var(--bg-muted);
}
.btn--solid {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn--solid:hover {
  opacity: 0.85;
  background: var(--text);
}

/* =============================================
   SECTIONS
   ============================================= */
.section {
  padding: 72px 0;
  border-top: 1px solid var(--border);
}

.section--muted {
  background: var(--bg-muted);
}

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section__title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.section__link {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.section__link:hover { color: var(--text); }

/* =============================================
   NEWS / TIMELINE
   ============================================= */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.news-item:first-child { border-top: 1px solid var(--border); }

.news-item__date {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-faint);
  padding-top: 3px;
  white-space: nowrap;
}

.news-item__text {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}
.news-item__text a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.news-item__text a:hover { color: var(--accent); }
.news-item__text strong { color: var(--text); }

/* =============================================
   FEATURED PAPERS (tejuadeyinka alternating style)
   ============================================= */
.featured-list {
  display: flex;
  flex-direction: column;
}

.featured-paper {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}
.featured-paper:first-child {
  border-top: 1px solid var(--border);
}

/* Reverse: image on right — flip column sizes so image still gets the 2fr slot */
.featured-paper--reverse {
  grid-template-columns: 1fr 2fr;
}
.featured-paper--reverse .featured-paper__img-wrap {
  grid-column: 2;
  grid-row: 1;
}
.featured-paper--reverse .featured-paper__content {
  grid-column: 1;
  grid-row: 1;
}

.featured-paper__img-wrap {
  border-radius: 14px;
  overflow: hidden;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.featured-paper__img-wrap:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow);
}
.featured-paper__img-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.featured-paper__placeholder {
  width: 100%;
  height: 100%;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--text-faint);
  font-style: italic;
}

.featured-paper__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.featured-paper__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.featured-paper__desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .featured-paper {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0;
  }
  .featured-paper--reverse .featured-paper__img-wrap,
  .featured-paper--reverse .featured-paper__content {
    grid-column: 1;
    grid-row: unset;
  }
  .featured-paper__title {
    font-size: 18px;
  }
}

/* =============================================
   PUBLICATION CARDS
   ============================================= */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pub-card {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}
.pub-card:first-child { border-top: 1px solid var(--border); }

.pub-card__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.pub-card__venue {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.pub-card__year {
  font-size: 13px;
  color: var(--text-faint);
  font-weight: 500;
}

.pub-card__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.pub-card__authors {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.5;
}
.pub-card__authors .me {
  color: var(--text);
  font-weight: 500;
}

.pub-card__abstract {
  font-size: 15px;
  color: var(--text-faint);
  line-height: 1.6;
  display: none;
}
.pub-card__abstract.open { display: block; }

.pub-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.pub-link {
  font-size: 14px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: background 0.2s, color 0.2s;
  cursor: pointer;
  background: transparent;
  font-family: inherit;
}
.pub-link:hover {
  background: var(--bg-muted);
  color: var(--text);
}

.pub-card__award {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  color: #d97706;
  background: rgba(217, 119, 6, 0.1);
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: 20px;
  padding: 2px 8px;
}

/* =============================================
   CV PAGE
   ============================================= */
.cv-section {
  margin-bottom: 48px;
}

.cv-section__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.cv-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.cv-item:last-child { border-bottom: none; }

.cv-item__year {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-faint);
  padding-top: 2px;
}

.cv-item__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.cv-item__subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.cv-item__desc {
  font-size: 15px;
  color: var(--text-faint);
  line-height: 1.6;
}
.cv-item__desc a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* =============================================
   SOCIAL ICONS ROW
   ============================================= */
.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.social-icon {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: background 0.2s, color 0.2s;
  text-decoration: none;
}
.social-icon:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.social-icon svg { width: 15px; height: 15px; flex-shrink: 0; }

/* =============================================
   FOOTER  (tejuadeyinka.com style)
   ============================================= */
.footer {
  margin-top: 80px;
}

.footer__divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.footer__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer__name {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-faint);
  letter-spacing: 0.01em;
}

.footer__links {
  display: flex;
  gap: 4px;
}

.footer__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: var(--text-faint);
  transition: background 0.2s, color 0.2s;
}
.footer__icon:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.footer__icon svg { width: 15px; height: 15px; }

/* =============================================
   BLOG LISTING
   ============================================= */
.blog-empty {
  padding: 48px 0;
  color: var(--text-faint);
  font-size: 16px;
}

.blog-post-card {
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.blog-post-card:first-of-type {
  border-top: 1px solid var(--border);
}

.blog-post-card__date {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 6px;
  font-weight: 500;
}

.blog-post-card__title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.blog-post-card__title a {
  color: var(--text);
  text-decoration: none;
}
.blog-post-card__title a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.blog-post-card__excerpt {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

/* =============================================
   PAGE HEADER (inner pages)
   ============================================= */
.page-header {
  padding: 56px 0 48px;
}

.page-header__title {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-header__desc {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero__img-wrap {
    order: -1;
    max-width: 220px;
  }

  .hero__greeting {
    font-size: 32px;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .footer__inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .news-item {
    grid-template-columns: 80px 1fr;
  }

  .cv-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .cv-item__year {
    font-size: 11px;
  }

  .page-header__title {
    font-size: 30px;
  }

  .section {
    padding: 48px 0;
  }
}

@media (max-width: 480px) {
  .hero__greeting { font-size: 28px; }
  .container { padding: 0 16px; }
}