/* layout.css - page frame, tab bar, panels, breakpoints, print. */

html {
  background: var(--bg);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* The particle canvas sits behind everything and never takes pointer events. */
#particles {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* A soft accent glow anchored behind the masthead. Fixed and non-interactive,
   so it reads as light in the room rather than as an element on the page. */
body::before {
  content: '';
  position: fixed;
  top: -220px;
  left: 50%;
  width: min(1100px, 130vw);
  height: 620px;
  transform: translateX(-50%);
  background:
    radial-gradient(closest-side, var(--accent-glow), transparent 72%);
  opacity: 0.55;
  z-index: 0;
  pointer-events: none;
}

.shell {
  position: relative;
  z-index: 1;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--s-5) var(--s-8);
}

/* ------------------------------------------------------------- skip link */

.skip {
  position: absolute;
  left: var(--s-4);
  top: -100px;
  z-index: 100;
  padding: var(--s-2) var(--s-4);
  border-radius: var(--radius-sm);
  background: var(--accent-solid);
  color: var(--on-accent);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}

.skip:focus {
  top: var(--s-4);
}

/* ---------------------------------------------------------------- masthead */

.masthead {
  display: flex;
  align-items: center;
  gap: var(--s-5);
  padding: var(--s-7) 0 var(--s-5);
}

.masthead__avatar {
  flex: 0 0 auto;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow);
  background: var(--bg-sunken);
}

.masthead__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.masthead__id {
  flex: 1 1 auto;
  min-width: 0;
}

.masthead__name {
  font-size: clamp(1.7rem, 4.2vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-strong);
  font-weight: 700;
}

.masthead__role {
  color: var(--accent-ink);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
}

.masthead__tools {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

/* ---------------------------------------------------------------- tab bar */

.tabbar {
  position: sticky;
  top: 0;
  z-index: 20;
  margin: 0 calc(var(--s-5) * -1);
  padding: 0 var(--s-5);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.tablist {
  position: relative;
  display: flex;
  gap: var(--s-1);
  overflow-x: auto;
  scrollbar-width: none;
}

.tablist::-webkit-scrollbar {
  display: none;
}

.tab {
  position: relative;
  flex: 0 0 auto;
  padding: var(--s-4) var(--s-3) calc(var(--s-4) - 2px);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.tab:hover {
  color: var(--text);
  background: var(--accent-wash);
}

.tab[aria-selected='true'] {
  color: var(--accent-ink);
}

/* One shared underline that slides, rather than a border per tab. */
.tablist__indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
  transition: transform var(--dur) var(--ease), width var(--dur) var(--ease);
  will-change: transform, width;
}

/* --------------------------------------------------------------- panels */

.panel {
  display: none;
  padding-top: var(--s-7);
}

.panel.is-active {
  display: block;
}

/* A small rise on tab change. Applied per activation by tabs.js.
 *
 * Transform only, deliberately. An earlier version faded opacity from 0, which
 * meant a panel rendered invisible whenever the animation clock was not
 * advancing: a running animation reports its 0% keyframe, and in a throttled or
 * non-visible view it can sit there indefinitely. Timers are throttled in that
 * same state, so no JS fallback can rescue it either. Keeping opacity out of
 * the keyframes makes the worst case a harmless 8px offset instead of blank
 * content. */
.panel.is-entering {
  animation: panel-in 190ms var(--ease);
}

@keyframes panel-in {
  from {
    transform: translateY(8px);
  }
  to {
    transform: none;
  }
}

.panel > * + * {
  margin-top: var(--s-6);
}

/* --------------------------------------------------------------- headings */

/* Small caps label with a rule that fades out to the right. */
.section-title {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: var(--s-4);
}

.section-title::after {
  content: '';
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(to right, var(--line), transparent);
}

h2.head {
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--text-strong);
  font-weight: 700;
}

h3.subhead {
  font-size: 1.1rem;
  line-height: 1.35;
  color: var(--text-strong);
  font-weight: 650;
}

.prose {
  max-width: var(--measure);
}

.prose p + p {
  margin-top: var(--s-4);
}

.lede {
  font-size: clamp(1.2rem, 2.7vw, 1.55rem);
  line-height: 1.42;
  color: var(--text-strong);
  max-width: 40ch;
  font-weight: 700;
  letter-spacing: -0.022em;
  text-wrap: balance;
}

/* The lede is the first thing read, so it gets a little colour on the tail. */
.lede em {
  font-style: normal;
  color: var(--accent-ink);
}

/* ----------------------------------------------------------------- footer */

.foot {
  margin-top: var(--s-8);
  padding-top: var(--s-5);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--faint);
}

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

.foot a:hover {
  color: var(--accent-ink);
}

/* ------------------------------------------------------------ focus rings */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------------------------------------------------------- breakpoints */

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .shell {
    padding: 0 var(--s-4) var(--s-7);
  }

  .tabbar {
    margin: 0 calc(var(--s-4) * -1);
    padding: 0 var(--s-4);
  }

  .masthead {
    flex-wrap: wrap;
    padding-top: var(--s-5);
    gap: var(--s-4);
  }

  .masthead__avatar {
    width: 68px;
    height: 68px;
  }

  .masthead__tools {
    order: 3;
    width: 100%;
  }
}

/* ---------------------------------------------------------------- print */

/* Printing should produce the whole CV, not whichever tab happened to be open. */
@media print {
  :root {
    --bg: #fff;
    --bg-panel: #fff;
    --bg-raised: #fff;
    --bg-sunken: #fff;
    --text: #000;
    --text-strong: #000;
    --muted: #333;
    --faint: #555;
    --line: #bbb;
    --accent: #000;
    --accent-ink: #000;
    --shadow: none;
    --shadow-lift: none;
  }

  #particles,
  .tabbar,
  .skip,
  .theme-toggle,
  .filterbar,
  .foot {
    display: none !important;
  }

  .panel {
    display: block !important;
    page-break-inside: auto;
    padding-top: var(--s-5);
  }

  .panel::before {
    content: attr(data-print-title);
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    border-bottom: 2px solid #000;
    padding-bottom: 4px;
    margin-bottom: var(--s-4);
  }

  /* Flip cards print flat, showing the front only. */
  .flip__inner {
    transform: none !important;
  }

  .flip__back {
    display: none !important;
  }

  .card,
  .pub {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #bbb;
  }

  a {
    text-decoration: underline;
  }

  /* Make link targets recoverable on paper. */
  .prose a[href^='http']::after,
  .pub a[href^='http']::after {
    content: ' (' attr(href) ')';
    font-size: 0.75em;
    color: #555;
    word-break: break-all;
  }
}

/* -------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  #particles {
    display: none;
  }
}