/* Minimal layout — clean single-column design.
   The hero keeps the animated stars/watercolor background as the one creative element. */

/* ---------- Theme toggle (fixed top right) ---------- */

.theme-toggle--fixed {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 110;
  margin-left: 0;
}

/* ---------- Floating top nav (hidden until scrolled past the hero photo) ---------- */

.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 14px var(--spacing-md);
  padding-right: 90px; /* keep clear of the fixed theme toggle */
  background: rgba(15, 15, 15, 0.45);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transform: translateY(-100%);
  transition: transform 0.35s ease;
}

.light-mode .topnav {
  background: rgba(250, 250, 248, 0.55);
}

.topnav--visible {
  transform: translateY(0);
}

.topnav__links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.1rem;
}

.topnav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.85;
  border-bottom: 1px solid transparent;
  transition: opacity 0.2s ease, border-color 0.2s ease;
}

.topnav__links a:hover {
  opacity: 1;
  border-bottom-color: var(--color-text);
}

/* ---------- Hero ---------- */

.hero {
  --hero-height: 400px; /* single knob for the top section's size */
  position: relative;
  overflow: visible;
  min-height: var(--hero-height);
  display: flex;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-md) 0;
  box-sizing: border-box;
}

@media screen and (max-width: 768px) {
  .hero {
    --hero-height: 460px;
  }
}

/* Layer stack: watercolor image (0) -> particle canvas (2, set inline)
   -> fade gradient (3) -> content (4) */
.hero > #stars-background {
  z-index: 0;
}

/* Fade the creative background into the plain page background */
.hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 400px;
  background: linear-gradient(to bottom, transparent, var(--color-background));
  z-index: 3;
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 4;
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
}

.hero__text {
  padding-bottom: var(--spacing-lg);
}

.hero__photo {
  width: 216px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
  margin-bottom: -48px;
  flex-shrink: 0;
}

@media screen and (max-width: 768px) {
  .hero__photo {
    margin-bottom: -32px;
  }
}

.hero__name {
  font-size: 3rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.hero__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs) 1.1rem;
}

.hero__nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.8;
  border-bottom: 1px solid transparent;
  transition: opacity 0.2s ease, border-color 0.2s ease;
}

.hero__nav a:hover {
  opacity: 1;
  border-bottom-color: var(--color-text);
}

/* Easter egg under the nav — a whisper pointing at the fission animation.
   Brightens on hover to reward anyone who notices it. */
.hero__hint {
  margin: var(--spacing-sm) 0 0;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  font-style: italic;
  color: var(--color-text);
  opacity: 0.32;
  transition: opacity 0.3s ease;
  cursor: default;
}

.hero__hint:hover {
  opacity: 0.75;
}

/* Swap the wording with the theme: embers in dark, Cherenkov blue in light */
.hero__hint--light {
  display: none;
}

.light-mode .hero__hint--dark {
  display: none;
}

.light-mode .hero__hint--light {
  display: inline;
}

/* Legibility over the watercolor image in both themes */
.light-mode .hero__name,
.light-mode .hero__nav a {
  text-shadow: 0 1px 12px rgba(255, 255, 255, 0.5);
}

:root:not(.light-mode) .hero__name,
:root:not(.light-mode) .hero__nav a {
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
}

/* ---------- Page & sections ---------- */

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  /* Single knob for space between sections. Applied both above and below the
     divider line, so the visible gap is roughly 2x this value. */
  --section-gap: 5.5rem;
  padding: var(--section-gap) 0 0;
  margin-top: var(--section-gap);
  border-top: 1px solid var(--color-border);
}

/* The intro (About) flows straight from the hero — no rule above it.
   The top padding matches the hero photo's -48px overhang so the intro
   copy hugs the hero without running underneath the photo. */
#about {
  border-top: none;
  margin-top: 0;
  padding-top: 48px;
}

.section__heading {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-heading);
}

/* Small accent underline to anchor each section.
   Follows each theme's particle palette: amber embers in dark, teal in light. */
.section__heading::after {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: #f0a030;
  border-radius: 1px;
  margin-top: 10px;
}

.light-mode .section__heading::after {
  background: #2e86ff;
}

.section__note {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.section__footnote {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-md);
  margin-bottom: 0;
}

/* ---------- About ---------- */

.about__text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.about__links {
  display: flex;
  gap: var(--spacing-md);
  margin: var(--spacing-sm) 0 0;
}

.about__links a {
  font-size: 0.875rem;
  color: var(--color-primary);
}

.about__links a:hover {
  text-decoration: underline;
}

/* ---------- Publications ---------- */

.pubs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.pub {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.pub__title {
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--color-text);
  font-family: var(--font-heading);
  letter-spacing: -0.01em;
  line-height: 1.45;
}

.pub__authors {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pub__venue {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pub__venue a {
  color: var(--color-primary);
}

.pub__venue a:hover {
  text-decoration: underline;
}

/* ---------- Experience ---------- */

.jobs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.job {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--spacing-md);
}

.job__period {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding-top: 2px;
  white-space: nowrap;
}

.job__body {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.job__role {
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--color-text);
  font-family: var(--font-heading);
  letter-spacing: -0.01em;
}

.job__org {
  color: var(--color-primary);
}

.job__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- Generic item lists (projects, geopolitics, writing) ---------- */

.items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.item__link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  color: inherit;
}

.item__title {
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--color-text);
  font-family: var(--font-heading);
  letter-spacing: -0.01em;
}

.item__arrow {
  color: var(--color-primary);
  font-weight: 400;
  display: inline-block;
  transition: transform 0.2s ease;
}

.item__link:hover .item__arrow {
  transform: translateX(4px);
}

.item__link:hover .item__title {
  color: var(--color-primary);
}

.item__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- Footer ---------- */

.footer {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.footer p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
}

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

.footer a:hover {
  color: var(--color-primary);
}

/* ---------- Animations ---------- */

.fade-in {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Mobile ---------- */

@media screen and (max-width: 640px) {
  /* Tighten the vertical rhythm on phones — 5.5rem between sections leaves
     big dead gaps (most noticeably right after the hero photo). */
  .section {
    --section-gap: 2rem;
  }

  .hero__inner {
    flex-direction: column-reverse; /* photo above the name */
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
  }

  .hero__text {
    padding-bottom: 0;
  }

  /* No photo overhang on phones (it sits above the name), so no clearance needed */
  #about {
    padding-top: 0;
  }

  .hero__nav {
    justify-content: center;
  }

  .hero__photo {
    width: 160px;
    margin-bottom: 0;
  }

  .hero__name {
    font-size: 2rem;
  }

  .job {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .topnav {
    padding: 12px var(--spacing-sm);
    padding-right: 70px;
  }

  .topnav__links {
    gap: 0.7rem;
  }

  .topnav__links a {
    font-size: 0.75rem;
  }

  /* Drop Home on small screens; the name at top serves the same purpose */
  .topnav__links a[href="#home"] {
    display: none;
  }
}