/* KARIZ interaction layer. Every value comes from ds-classical.css tokens.
   Only things that cannot be expressed inline live here: scroll reveal,
   descendant hover states, tooltips, accordions, drawers, snap rails. */

:root { --kz-ink: #1a1918; }

/* Tooltips are laid out even while hidden; clip (not hidden) keeps them from
   inflating scrollWidth without creating a scroll container that would
   break the sticky header. */
html, body { overflow-x: clip; }

/* ── scroll reveal ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  html.kz-motion [data-reveal] { opacity: 0; transform: translateY(22px); }
  html.kz-motion [data-reveal].kz-in {
    opacity: 1; transform: none;
    transition: opacity .75s cubic-bezier(.2,.7,.2,1), transform .75s cubic-bezier(.2,.7,.2,1);
    transition-delay: var(--kz-d, 0ms);
  }
}

/* ── high-contrast block that inverts on hover ─────────────────── */
.kz-block {
  transition: background-color .38s ease, color .38s ease, box-shadow .38s ease, transform .32s ease;
}
.kz-block:hover, .kz-block:focus-within {
  background: var(--kz-ink); color: var(--color-bg);
  box-shadow: var(--shadow-md); transform: translateY(-4px);
}
.kz-block:hover .kz-dim, .kz-block:focus-within .kz-dim { color: color-mix(in srgb, var(--color-bg) 70%, transparent); }
.kz-block:hover .kz-gold, .kz-block:focus-within .kz-gold { color: var(--color-accent-300); }
.kz-block:hover .kz-rule, .kz-block:focus-within .kz-rule { background: color-mix(in srgb, var(--color-bg) 28%, transparent); border-color: color-mix(in srgb, var(--color-bg) 28%, transparent); }
.kz-block:hover .kz-more, .kz-block:focus-within .kz-more { color: var(--color-accent-300); border-color: var(--color-accent-400); }
.kz-block:hover .kz-tagline, .kz-block:focus-within .kz-tagline { border-color: color-mix(in srgb, var(--color-bg) 34%, transparent); color: color-mix(in srgb, var(--color-bg) 80%, transparent); }

/* ── buttons: readable, high contrast ──────────────────────────── */
.kz-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 15.5px; line-height: 1.2; letter-spacing: .01em;
  text-decoration: none; cursor: pointer; padding: 13px 26px;
  border-radius: var(--radius-md); border: 1px solid var(--kz-ink);
  background: var(--kz-ink); color: var(--color-bg);
  transition: background .25s ease, border-color .25s ease, color .25s ease, transform .2s ease, box-shadow .25s ease;
}
.kz-btn:hover { background: var(--color-accent-800); border-color: var(--color-accent-800); color: var(--color-bg); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.kz-btn:active { background: var(--color-accent-900); transform: none; box-shadow: none; }
.kz-btn-sm { font-size: 14px; padding: 10px 18px; }

.kz-btn-out { background: transparent; color: var(--color-accent-800); border-color: var(--color-accent-600); }
.kz-btn-out:hover { background: var(--color-accent-100); color: var(--color-accent-900); border-color: var(--color-accent-800); box-shadow: none; }
.kz-btn-out:active { background: var(--color-accent-200); }

.kz-on-dark { background: transparent; color: var(--color-accent-200); border-color: var(--color-accent-400); }
.kz-on-dark:hover { background: color-mix(in srgb, var(--color-accent-300) 16%, transparent); color: var(--color-accent-100); border-color: var(--color-accent-300); }
.kz-on-dark:active { background: color-mix(in srgb, var(--color-accent-300) 26%, transparent); }

/* ── nav link with a rule that grows ──────────────────────────── */
.kz-nav-link { position: relative; text-decoration: none; color: inherit; }
.kz-nav-link::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -7px; height: 1px;
  background: var(--color-accent-600); transform: scaleX(0); transform-origin: left;
  transition: transform .28s cubic-bezier(.2,.7,.2,1);
}
.kz-nav-link:hover::after, .kz-nav-link:focus-visible::after { transform: scaleX(1); }
.kz-nav-link[aria-current='page']::after { transform: scaleX(1); background: var(--color-accent); }

/* ── hover tooltip on a key term ──────────────────────────────── */
.kz-term { border-bottom: 1px dotted var(--color-accent-600); cursor: help; position: relative; }
.kz-term::after {
  content: attr(data-tip); position: absolute; left: 50%; bottom: calc(100% + 11px);
  width: max-content; max-width: min(300px, 66vw);
  background: var(--kz-ink); color: var(--color-bg);
  font-family: var(--font-body); font-size: 12.5px; line-height: 1.6;
  letter-spacing: 0; text-transform: none; text-align: left;
  padding: 11px 13px; border-radius: var(--radius-md); box-shadow: var(--shadow-md);
  opacity: 0; transform: translate(-50%, 5px); pointer-events: none; z-index: 90;
  transition: opacity .2s ease, transform .2s ease;
}
.kz-term:hover::after, .kz-term:focus-visible::after { opacity: 1; transform: translate(-50%, 0); }

/* ── accordion (native details) ───────────────────────────────── */
.kz-acc { border-top: 1px solid var(--color-divider); }
.kz-acc:last-of-type { border-bottom: 1px solid var(--color-divider); }
.kz-acc > summary {
  list-style: none; cursor: pointer; display: flex; align-items: baseline; gap: var(--space-4);
  padding: var(--space-4) 0; font-family: var(--font-heading);
  font-size: clamp(18px, 1.6vw, 22px); transition: color .22s ease;
}
.kz-acc > summary::-webkit-details-marker { display: none; }
.kz-acc > summary:hover { color: var(--color-accent-800); }
.kz-acc > summary::after {
  content: '+'; margin-left: auto; font-size: 21px; line-height: 1;
  color: var(--color-accent-600); transition: transform .3s cubic-bezier(.2,.7,.2,1);
}
.kz-acc[open] > summary::after { transform: rotate(45deg); }
.kz-acc-body { padding: 0 0 var(--space-6); animation: kz-open .42s cubic-bezier(.2,.7,.2,1) both; }
@keyframes kz-open { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ── horizontal snap rail ─────────────────────────────────────── */
.kz-rail {
  display: flex; gap: var(--space-4); overflow-x: auto; scroll-snap-type: x proximity;
  padding-bottom: var(--space-4); scrollbar-width: thin;
  scrollbar-color: var(--color-neutral-400) transparent;
}
.kz-rail > * { scroll-snap-align: start; flex: 0 0 min(390px, 80vw); }
.kz-rail::-webkit-scrollbar { height: 6px; }
.kz-rail::-webkit-scrollbar-thumb { background: var(--color-neutral-400); border-radius: 999px; }

/* ── filter chips ─────────────────────────────────────────────── */
.kz-chip {
  appearance: none; cursor: pointer; white-space: nowrap;
  font-family: var(--font-heading); font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase;
  padding: 9px 17px; border-radius: 999px; background: transparent; color: var(--color-text);
  border: 1px solid var(--color-divider);
  transition: background .22s ease, color .22s ease, border-color .22s ease;
}
.kz-chip:hover { border-color: var(--color-accent-600); color: var(--color-accent-800); }
.kz-chip-on { background: var(--kz-ink); border-color: var(--kz-ink); color: var(--color-bg); }
.kz-chip-on:hover { background: var(--color-accent-800); border-color: var(--color-accent-800); color: var(--color-bg); }

/* ── side drawer ──────────────────────────────────────────────── */
.kz-scrim {
  position: fixed; inset: 0; z-index: 200; border: 0; padding: 0; cursor: pointer;
  background: color-mix(in srgb, var(--kz-ink) 48%, transparent);
  animation: kz-fade-in .3s ease both;
}
@keyframes kz-fade-in { from { opacity: 0; } to { opacity: 1; } }
.kz-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 210;
  width: min(580px, 100%); overflow-y: auto; overscroll-behavior: contain;
  background: var(--color-bg); border-left: 1px solid var(--color-divider);
  box-shadow: var(--shadow-lg);
  animation: kz-slide-in .4s cubic-bezier(.2,.75,.2,1) both;
}
@keyframes kz-slide-in { from { transform: translateX(100%); } to { transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .kz-drawer, .kz-scrim, .kz-acc-body { animation: none; }
  .kz-block:hover, .kz-block:focus-within { transform: none; }
}

/* ── misc ─────────────────────────────────────────────────────── */
.kz-lift { transition: box-shadow .3s ease, transform .3s ease, border-color .3s ease; }
.kz-lift:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-accent-400); }
.kz-count { font-variant-numeric: tabular-nums; }