/*
  Apple-inspired academic interface for buchaovo.com
  --------------------------------------------------
  Principles:
  - native system font stack; no remote font requests
  - generous whitespace and large type
  - restrained grayscale palette + one blue accent
  - translucent navigation and subtle surfaces
  - low-motion, fast, accessible interactions
*/

:root {
  --apple-bg: #f5f5f7;
  --apple-surface: #ffffff;
  --apple-surface-2: #fbfbfd;
  --apple-text: #1d1d1f;
  --apple-muted: #6e6e73;
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-line: rgba(0, 0, 0, 0.08);
  --apple-shadow: 0 14px 40px rgba(0, 0, 0, 0.055);
  --apple-radius: 24px;
  --apple-radius-sm: 16px;
  --site-max: 1180px;
  --reading-max: 780px;
}

html {
  scroll-behavior: smooth;
  background: var(--apple-bg);
}

body {
  color: var(--apple-text);
  background: var(--apple-bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.008em;
}

/* ---------- Navigation ---------- */
.navbar {
  min-height: 52px;
  background: rgba(250, 250, 252, 0.82) !important;
  border-bottom: 1px solid var(--apple-line);
  box-shadow: none;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.navbar .container-fluid,
.navbar .container-xxl {
  max-width: var(--site-max);
}

.navbar-brand {
  color: var(--apple-text) !important;
  font-size: 0.98rem;
  font-weight: 650;
  letter-spacing: -0.025em;
}

.navbar-nav .nav-link {
  color: rgba(29, 29, 31, 0.82) !important;
  font-size: 0.86rem;
  font-weight: 450;
  padding-left: 0.78rem !important;
  padding-right: 0.78rem !important;
  transition: color 140ms ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--apple-blue) !important;
}

.navbar-toggler {
  border: 0;
  box-shadow: none !important;
}

/* ---------- Global typography ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--apple-text);
  font-weight: 650;
  letter-spacing: -0.035em;
}

h1 {
  font-size: clamp(2.7rem, 6vw, 4.8rem);
  line-height: 0.98;
}

h2 {
  margin-top: 3.4rem;
  margin-bottom: 1.2rem;
  font-size: clamp(1.8rem, 3vw, 2.45rem);
  line-height: 1.08;
}

h3 {
  font-size: 1.28rem;
  line-height: 1.2;
}

p,
li {
  color: var(--apple-text);
  line-height: 1.72;
}

main.content p,
main.content li {
  line-height: 1.72;
}

a {
  color: var(--apple-blue);
  text-decoration: none;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--apple-blue-hover);
}

hr {
  border: 0;
  border-top: 1px solid var(--apple-line);
  opacity: 1;
  margin: 3rem 0;
}

/* ---------- Quarto layout ---------- */
#quarto-content {
  background: var(--apple-bg);
}

#quarto-document-content {
  padding-top: 1.2rem;
  padding-bottom: 5rem;
}

.quarto-title-banner {
  background: transparent;
}

.quarto-title-block .quarto-title-banner {
  padding-bottom: 0;
}

.quarto-title .title {
  font-weight: 650;
  letter-spacing: -0.045em;
}

.quarto-title .subtitle,
.description,
.quarto-title-meta {
  color: var(--apple-muted);
}

/* ---------- Home hero ---------- */
.hero {
  max-width: var(--site-max);
  margin: 4.5rem auto 6rem;
  padding: 2.6rem 1rem 0;
}

.hero h1 {
  margin: 0 0 1.1rem;
  max-width: 900px;
  font-size: clamp(3.3rem, 8vw, 6.6rem);
  line-height: 0.92;
  letter-spacing: -0.065em;
}

.hero-kicker,
.eyebrow {
  color: var(--apple-blue);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  margin-bottom: 0.9rem;
}

.hero-copy {
  max-width: 800px;
  color: var(--apple-muted);
  font-size: clamp(1.25rem, 2.35vw, 1.75rem);
  line-height: 1.42;
  letter-spacing: -0.025em;
  margin-bottom: 2rem;
}

.hero-links,
.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.72rem;
}

/* ---------- Buttons ---------- */
.btn {
  border-radius: 999px;
  padding: 0.62rem 1.18rem;
  font-size: 0.94rem;
  font-weight: 520;
  box-shadow: none !important;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--apple-blue);
  border-color: var(--apple-blue);
}

.btn-primary:hover {
  background: var(--apple-blue-hover);
  border-color: var(--apple-blue-hover);
}

.btn-outline-primary,
.btn-outline-secondary {
  color: var(--apple-text);
  background: rgba(255, 255, 255, 0.68);
  border-color: rgba(0, 0, 0, 0.12);
}

.btn-outline-primary:hover,
.btn-outline-secondary:hover {
  color: var(--apple-text);
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.18);
}

/* ---------- Cards / listings ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem;
  margin: 1.4rem 0 3.4rem;
}

.feature-card,
.quarto-grid-item.card,
.card {
  overflow: hidden;
  border: 1px solid var(--apple-line) !important;
  border-radius: var(--apple-radius) !important;
  background: rgba(255, 255, 255, 0.88) !important;
  box-shadow: none !important;
}

.feature-card {
  min-height: 220px;
  padding: 1.75rem 1.85rem;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.feature-card:hover,
.quarto-grid-item.card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 0, 0, 0.12) !important;
  box-shadow: var(--apple-shadow) !important;
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 0.8rem;
  font-size: 1.45rem;
}

.feature-card p {
  color: var(--apple-muted);
}

.quarto-grid-item .card-title,
.listing-title {
  font-weight: 620;
  letter-spacing: -0.025em;
}

.quarto-grid-item .card-text,
.listing-description,
.listing-date,
.listing-categories {
  color: var(--apple-muted) !important;
}

.home-list {
  max-width: var(--reading-max);
  margin-bottom: 3rem;
}

/* ---------- Apple-style About page ---------- */
.about-page {
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 3.8rem 1rem 5rem;
}

.about-hero {
  max-width: 940px;
  padding: 3.5rem 0 5rem;
}

.about-hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(3.7rem, 9vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.068em;
}

.about-role {
  margin-bottom: 1rem;
  color: var(--apple-text);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 590;
  letter-spacing: -0.025em;
}

.about-deck {
  max-width: 850px;
  margin-bottom: 2rem;
  color: var(--apple-muted);
  font-size: clamp(1.28rem, 2.35vw, 1.72rem);
  line-height: 1.46;
  letter-spacing: -0.028em;
}

.about-section {
  padding: 1rem 0 2rem;
}

.about-section > h2:first-child {
  margin-top: 1.2rem;
}

.interest-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.4rem 0 1rem;
}

.interest-card {
  min-height: 240px;
  padding: 1.65rem;
  border: 1px solid var(--apple-line);
  border-radius: var(--apple-radius);
  background: var(--apple-surface);
}

.interest-card h3 {
  margin: 0 0 1rem;
  font-size: 1.28rem;
}

.interest-card ul {
  padding-left: 1.08rem;
  margin-bottom: 0;
}

.interest-card li {
  color: var(--apple-muted);
  margin-bottom: 0.42rem;
}

.apple-list {
  overflow: hidden;
  margin: 1.2rem 0 1rem;
  border: 1px solid var(--apple-line);
  border-radius: var(--apple-radius);
  background: var(--apple-surface);
}

.apple-list-item {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 1.15rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--apple-line);
}

.apple-list-item:last-child {
  border-bottom: 0;
}

.apple-list-date {
  color: var(--apple-muted);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.apple-list-item p {
  margin: 0;
}

.publication-list {
  margin-top: 1rem;
}

.publication-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--apple-line);
}

.publication-item:first-child {
  border-top: 1px solid var(--apple-line);
}

.publication-item h3 {
  margin: 0 0 0.45rem;
  font-size: 1.18rem;
}

.publication-meta {
  color: var(--apple-muted);
  font-size: 0.96rem;
}

.timeline {
  margin-top: 1rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 1.3rem;
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--apple-line);
}

.timeline-item:first-child {
  border-top: 1px solid var(--apple-line);
}

.timeline-label {
  color: var(--apple-muted);
}

.timeline-item strong {
  display: block;
  margin-bottom: 0.22rem;
}

.contact-panel {
  margin-top: 1.5rem;
  padding: 1.8rem;
  border-radius: var(--apple-radius);
  background: #1d1d1f;
  color: #f5f5f7;
}

.contact-panel h2,
.contact-panel p,
.contact-panel strong {
  color: #f5f5f7;
}

.contact-panel a {
  color: #2997ff;
}

/* ---------- TOC / search / code ---------- */
#TOC {
  font-size: 0.86rem;
}

#TOC .nav-link {
  color: var(--apple-muted);
}

#TOC .nav-link.active,
#TOC .nav-link:hover {
  color: var(--apple-text);
}

.quarto-search-button,
.aa-DetachedSearchButton {
  border-radius: 999px !important;
}

pre,
div.sourceCode {
  border: 1px solid var(--apple-line) !important;
  border-radius: var(--apple-radius-sm) !important;
}

code {
  font-size: 0.92em;
}

/* ---------- Footer ---------- */
.nav-footer {
  background: #f5f5f7;
  border-top: 1px solid var(--apple-line);
  color: var(--apple-muted);
  font-size: 0.82rem;
}

.nav-footer a {
  color: var(--apple-muted);
}

.nav-footer a:hover {
  color: var(--apple-text);
}

/* ---------- Dark mode ---------- */
body.quarto-dark,
html[data-bs-theme="dark"] body {
  --apple-bg: #000000;
  --apple-surface: #1c1c1e;
  --apple-surface-2: #141414;
  --apple-text: #f5f5f7;
  --apple-muted: #a1a1a6;
  --apple-blue: #2997ff;
  --apple-blue-hover: #5ac8fa;
  --apple-line: rgba(255, 255, 255, 0.12);
  --apple-shadow: 0 16px 48px rgba(0, 0, 0, 0.42);
}

body.quarto-dark .navbar,
html[data-bs-theme="dark"] .navbar {
  background: rgba(18, 18, 18, 0.78) !important;
}

body.quarto-dark .btn-outline-primary,
body.quarto-dark .btn-outline-secondary,
html[data-bs-theme="dark"] .btn-outline-primary,
html[data-bs-theme="dark"] .btn-outline-secondary {
  color: var(--apple-text);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.16);
}

body.quarto-dark .nav-footer,
html[data-bs-theme="dark"] .nav-footer {
  background: #000;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .interest-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (max-width: 760px) {
  .hero {
    margin-top: 2rem;
    margin-bottom: 4rem;
    padding-top: 1.5rem;
  }

  .hero h1,
  .about-hero h1 {
    letter-spacing: -0.055em;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .about-page {
    padding-top: 1.4rem;
  }

  .about-hero {
    padding-top: 2.1rem;
    padding-bottom: 3.3rem;
  }

  .apple-list-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ---------- Education cards ---------- */
.education-section {
  padding-bottom: 2.6rem;
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.35rem;
}

.education-card {
  position: relative;
  min-height: 230px;
  padding: 1.55rem 1.6rem 1.5rem;
  overflow: hidden;
  border: 1px solid var(--apple-line);
  border-radius: var(--apple-radius);
  background: var(--apple-surface);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.education-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 0, 0, 0.13);
  box-shadow: var(--apple-shadow);
}

.education-current {
  background:
    radial-gradient(circle at 90% 0%, rgba(0, 113, 227, 0.11), transparent 42%),
    var(--apple-surface);
  border-color: rgba(0, 113, 227, 0.22);
}

.education-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 2.5rem;
}

.education-period {
  color: var(--apple-muted);
  font-size: 0.88rem;
  font-weight: 520;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.education-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.25rem 0.68rem;
  border-radius: 999px;
  color: var(--apple-muted);
  background: var(--apple-bg);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.education-current .education-badge {
  color: var(--apple-blue);
  background: rgba(0, 113, 227, 0.09);
}

.education-card h3 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.28rem, 2vw, 1.55rem);
  line-height: 1.14;
  letter-spacing: -0.035em;
}

.education-degree {
  margin-bottom: 0.25rem;
  color: var(--apple-text);
  font-size: 1rem;
  font-weight: 590;
  line-height: 1.4;
}

.education-location {
  color: var(--apple-muted);
  font-size: 0.94rem;
  line-height: 1.4;
}

body.quarto-dark .education-current,
html[data-bs-theme="dark"] .education-current {
  background:
    radial-gradient(circle at 90% 0%, rgba(41, 151, 255, 0.15), transparent 42%),
    var(--apple-surface);
  border-color: rgba(41, 151, 255, 0.25);
}

body.quarto-dark .education-card:hover,
html[data-bs-theme="dark"] .education-card:hover {
  border-color: rgba(255, 255, 255, 0.18);
}

@media (max-width: 900px) {
  .education-grid {
    grid-template-columns: 1fr;
  }

  .education-card {
    min-height: 0;
  }

  .education-head {
    margin-bottom: 1.7rem;
  }
}


/* ---------- Portrait integration ---------- */
.hero-with-photo {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) 300px;
  align-items: center;
  gap: 2.2rem;
}

.hero-main {
  min-width: 0;
}

.hero-photo-wrap,
.about-photo-wrap {
  display: flex;
  justify-content: center;
}

.profile-photo {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 28px;
  border: 1px solid var(--apple-line);
  background: #ffffff;
  box-shadow: var(--apple-shadow);
}

.home-profile-photo {
  width: min(100%, 300px);
  aspect-ratio: 4 / 5;
}

.about-hero-with-photo {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) 320px;
  align-items: center;
  gap: 2.5rem;
  max-width: 1120px;
}

.about-hero-main {
  min-width: 0;
}

.about-profile-photo {
  width: min(100%, 320px);
  aspect-ratio: 4 / 5;
}

@media (max-width: 980px) {
  .hero-with-photo,
  .about-hero-with-photo {
    grid-template-columns: 1fr;
  }

  .hero-photo-wrap,
  .about-photo-wrap {
    justify-content: flex-start;
  }

  .home-profile-photo,
  .about-profile-photo {
    width: min(100%, 280px);
  }
}

@media (max-width: 760px) {
  .hero-photo-wrap,
  .about-photo-wrap {
    justify-content: center;
  }
}