/* ===== Tile ===== */
.tile {
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: var(--r-lg);
  padding: var(--s-5);
}
.tile__label {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-1);
  background: var(--bg-3);
  border: 1px solid var(--border-1);
  padding: 4px 12px;
  border-radius: var(--r-pill);
  margin-bottom: var(--s-3);
}
.tile__title {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--s-2);
}
.tile__body {
  font-size: 20px;
  color: var(--fg-1);
  line-height: 1.5;
}
.tile.frag.is-current {
  border-color: var(--border-2);
  background: var(--bg-3);
  box-shadow: 0 0 0 4px var(--accent-glow);
  transform: translateY(-2px);
}
.tile.frag.is-current .tile__label { color: var(--accent-2-text); }

.tile--feature { padding: var(--s-6); border-color: var(--border-2); }
.tile--feature .tile__title { font-size: 36px; }

.tile--ghost {
  border-style: dashed;
  background: transparent;
  position: relative;
}
.tile--ghost .tile__title,
.tile--ghost .tile__body,
.tile--ghost .tile__label { color: var(--fg-3); background: transparent; }
.tile--ghost.is-orphan-loud {
  animation: orphan-pulse 2.4s ease-in-out infinite;
}
.tile--ghost.is-orphan-loud::after {
  content: "0 ←";
  position: absolute;
  right: -10px; top: -10px;
  background: var(--err);
  color: white;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  letter-spacing: 0.08em;
}
@keyframes orphan-pulse {
  0%, 100% { border-color: var(--fg-3); box-shadow: 0 0 0 0 rgba(239,68,68,0); }
  50%      { border-color: var(--err); box-shadow: 0 0 0 6px rgba(239,68,68,0.18); }
}

/* Act divider — sparse slot between sections.
   Display is governed by .slide / .slide.is-active; here we only set inner layout
   (which applies when the slide is shown via the base rule). */
.act-divider {
  justify-content: center;
  align-items: flex-start;
  padding: 0 var(--s-8);
}
.act-divider__num { display: none; }
.act-divider__title {
  font-size: 108px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.025em;
  max-width: 1700px;
}
.act-divider__sub {
  font-size: 28px;
  color: var(--fg-1);
  margin-top: var(--s-4);
  max-width: 1500px;
  line-height: 1.4;
}

.tile--ok { border-left: 3px solid var(--ok); }
.tile--warn { border-left: 3px solid var(--warn); }
.tile--err { border-left: 3px solid var(--err); }

/* Neutral contrast variant — for "the other side" without quality judgment */
.tile--alt { background: var(--bg-1); border-color: var(--border-1); }
.tile--alt .tile__label { color: var(--accent-2-text); }

/* Stat tile — for big numbers */
.tile--stat { text-align: center; padding: var(--s-6); }
.tile--stat .stat__num { font-size: 160px; font-weight: 900; line-height: 1; letter-spacing: -0.03em; }
.tile--stat .stat__num--md { font-size: 96px; }
.tile--stat .stat__sub { font-size: 22px; color: var(--fg-1); margin-top: var(--s-3); }
.tile--stat .stat__cap { font-size: 16px; color: var(--fg-2); margin-top: var(--s-2); font-family: 'JetBrains Mono', monospace; }

/* ===== Tile Grid Helpers ===== */
.tiles-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-5); }
.tiles-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); }
.tiles-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-4); }

/* ===== Language pill ===== */
.lang-pill {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-1);
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  min-width: 100px;
  text-align: center;
  margin-right: var(--s-3);
}

.lang-example {
  display: flex;
  align-items: center;
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--border-1);
  font-size: 26px;
}
.lang-example:last-child { border-bottom: none; }

/* ===== Pull quote ===== */
.pull-quote {
  position: relative;
  background: var(--bg-1);
  padding: var(--s-6) var(--s-7);
  border-radius: var(--r-lg);
  border: 1px solid var(--border-1);
}
.pull-quote::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 6px; border-radius: 3px 0 0 3px; background: var(--grad);
}
.pull-quote__body {
  font-size: 44px;
  font-style: italic;
  font-weight: 400;
  line-height: 1.4;
  color: var(--fg-0);
  letter-spacing: -0.005em;
}
.pull-quote__body--sm { font-size: 36px; }
.pull-quote__attr {
  margin-top: var(--s-4);
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  color: var(--fg-1);
}

/* ===== Citation ===== */
sup.cite { color: var(--accent-1-text); font-weight: 700; padding: 0 2px;
  font-family: 'JetBrains Mono', monospace; font-size: 0.6em; }

/* ===== Eyebrow pill (reusable label) ===== */
.eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-1-text);
}

/* ===== Code block ===== */
.code-block {
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: var(--r-md);
  padding: var(--s-4);
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-mono);
  line-height: 1.5;
  color: var(--fg-0);
  overflow: hidden;
}
.code-block .kw { color: var(--syntax-purple); }
.code-block .fn { color: var(--syntax-blue); }
.code-block .str { color: var(--syntax-green); }
.code-block .num { color: var(--syntax-orange); }
.code-block .com { color: var(--fg-2); font-style: italic; }

/* ===== Big stat / number ===== */
.bigstat {
  font-size: 160px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
}
.bigstat__sub {
  font-size: 24px;
  color: var(--fg-1);
  font-weight: 500;
  margin-top: var(--s-3);
  max-width: 480px;
}

/* ===== Two-column split ===== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-7);
  align-items: start;
}
.split--narrow-left { grid-template-columns: 1fr 2fr; }
.split--narrow-right { grid-template-columns: 2fr 1fr; }
.split--fill { height: 100%; }

/* ===== Big lede ===== */
.lede {
  font-size: 36px;
  line-height: 1.4;
  color: var(--fg-0);
  font-weight: 500;
  max-width: 1200px;
}
.lede em { font-style: italic; color: var(--fg-1); }
.lede strong { font-weight: 700; }

/* ===== Section header for slide bodies ===== */
.body-heading {
  font-size: var(--t-h3);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--s-4);
}

/* ===== Body paragraph ===== */
.body-p {
  font-size: var(--t-body);
  color: var(--fg-0);
  line-height: 1.5;
  max-width: 1280px;
}
.body-p + .body-p { margin-top: var(--s-4); }
/* ===== Fill-in-the-blank call widget (mirrors the platform's probe /
   test-the-claim interface: boxed argument inputs, live return value) ===== */
.pcall {
  font-family: 'JetBrains Mono', monospace;
  color: var(--fg-0);
  display: flex; align-items: center; flex-wrap: wrap; row-gap: 8px;
}
.pcall__chip {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 2.1em; height: 1.6em; padding: 0 0.4em; margin: 0 0.25em;
  background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 8px;
  font-weight: 700; color: var(--fg-0);
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}
.pcall__chip.is-typing {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 1px var(--accent-2), 0 0 16px rgba(236, 72, 153, 0.22);
}
.pcall__ret {
  font-weight: 700; margin-left: 0.35em; opacity: 0.3;
  transition: opacity 200ms var(--ease);
}
.pcall__ret.is-on { opacity: 1; }
.pcall__note {
  margin-left: 0.6em; color: var(--fg-2); opacity: 0; transform: translateX(-6px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}
.pcall__note.is-on { opacity: 1; transform: translateX(0); }
.pcall__btn {
  display: inline-flex; align-items: center; justify-content: center;
  margin-top: 12px; padding: 8px 24px; border-radius: 999px;
  background: linear-gradient(135deg, #4338ca, #5b21b6); color: #fff;
  font-family: 'JetBrains Mono', monospace; font-size: 20px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  transition: transform 140ms var(--ease), filter 140ms var(--ease);
}
.pcall__btn.is-pressed { transform: scale(0.94); filter: brightness(1.3); }
@keyframes pcall-count-pop {
  0% { transform: translateY(-0.55em); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}
.pcall__count { display: inline-block; }
.pcall__count.is-flip { animation: pcall-count-pop 260ms var(--ease); }