/* ══════════════════════════════════════════════════════════════════════
 * HOC Motion · Pack 01: Editorial Weight (Scale-derived)
 * Version 0.1 · 2026-05-20
 *
 * Six named motion profiles for HOC web surfaces. Scale-derived character:
 * measured, editorial, never twee. Sister to the Wang / iOS 26 vocabulary
 * which governs app-internal transitions.
 *
 * Source of truth: Notion page (HOC Motion · Pack 01: Editorial Weight)
 *   https://www.notion.so/36724e67052c816ca819e7bd3477c5d2
 *
 * Companion runtime: hoc-motion-pack-01.js (IntersectionObserver +
 * scroll listeners for the three profiles that need JS).
 *
 * Apply by name (data attributes or utility classes). Never re-derive
 * a curve — version-bump the pack instead.
 * ══════════════════════════════════════════════════════════════════════ */

:root {
  /* Easing curves — names, not numbers, in app code */
  --hoc-ease-settle:   cubic-bezier(0.16, 1, 0.3, 1);
  --hoc-ease-standard: cubic-bezier(0.4, 0, 0.2, 1);

  /* Durations */
  --hoc-dur-quick:     180ms;
  --hoc-dur-medium:    240ms;
  --hoc-dur-crossfade: 350ms;
  --hoc-dur-reveal:    600ms;
  --hoc-dur-marquee:   45s;

  /* Stagger between siblings (editorial-reveal) */
  --hoc-stagger:       80ms;

  /* Parallax coefficient for scroll-horizon (background) */
  --hoc-parallax-bg:   0.35;
}

/* ── 01 · editorial-reveal ─────────────────────────────────────────────
 * Mark elements with [data-reveal]. Stagger via :nth-child or
 * style="--hoc-reveal-delay: 240ms". Runtime sets [data-reveal-visible]
 * via IntersectionObserver at 20% threshold.
 */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--hoc-dur-reveal) var(--hoc-ease-settle),
              transform var(--hoc-dur-reveal) var(--hoc-ease-settle);
  transition-delay: var(--hoc-reveal-delay, 0ms);
}
[data-reveal][data-reveal-visible] {
  opacity: 1;
  transform: translateY(0);
}

/* Common stagger pattern — auto-cascade via nth-child */
[data-reveal-group] > [data-reveal]:nth-child(1) { --hoc-reveal-delay: 0ms; }
[data-reveal-group] > [data-reveal]:nth-child(2) { --hoc-reveal-delay: 80ms; }
[data-reveal-group] > [data-reveal]:nth-child(3) { --hoc-reveal-delay: 160ms; }
[data-reveal-group] > [data-reveal]:nth-child(4) { --hoc-reveal-delay: 240ms; }
[data-reveal-group] > [data-reveal]:nth-child(5) { --hoc-reveal-delay: 320ms; }
[data-reveal-group] > [data-reveal]:nth-child(6) { --hoc-reveal-delay: 400ms; }

/* ── 02 · tab-crossfade ────────────────────────────────────────────────
 * Apply to a parent wrapping multiple tab panels.
 * Tab visibility is driven by [data-tab-active] on the panel.
 */
[data-tab-panel] {
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 250ms var(--hoc-ease-settle),
              transform 250ms var(--hoc-ease-settle);
  pointer-events: none;
  position: absolute;
  inset: 0;
}
[data-tab-panel][data-tab-active] {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
  position: relative;
}

/* ── 03 · logo-marquee ─────────────────────────────────────────────────
 * Wrap a row of logos in [data-marquee]; the inner track gets
 * [data-marquee-track]. Duplicate content inside the track for
 * seamless loop.
 */
[data-marquee] {
  overflow: hidden;
  position: relative;
}
[data-marquee-track] {
  display: flex;
  width: max-content;
  animation: hoc-marquee var(--hoc-dur-marquee) linear infinite;
}
[data-marquee]:hover [data-marquee-track] {
  animation-play-state: paused;
}
@keyframes hoc-marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── 04 · hover-lift ───────────────────────────────────────────────────
 * Apply [data-lift] to interactive surfaces (cards, buttons that
 * shouldn't sit as primary CTA — let primary CTAs stand still).
 */
[data-lift] {
  transition: transform var(--hoc-dur-quick) var(--hoc-ease-standard),
              box-shadow var(--hoc-dur-quick) var(--hoc-ease-standard);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
[data-lift]:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ── 05 · sticky-peek ──────────────────────────────────────────────────
 * Sticky header that hides on scroll-down past 80px, returns on any
 * upward gesture. Runtime sets [data-peek-hidden] + [data-peek-elevated].
 */
[data-peek] {
  position: sticky;
  top: 0;
  z-index: 50;
  transition: transform var(--hoc-dur-medium) var(--hoc-ease-standard),
              box-shadow var(--hoc-dur-medium) var(--hoc-ease-standard);
}
[data-peek][data-peek-hidden] {
  transform: translateY(-100%);
}
[data-peek][data-peek-elevated] {
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

/* ── 06 · scroll-horizon ───────────────────────────────────────────────
 * Background parallax for decorative elements only. Runtime writes
 * --hoc-horizon-offset on each [data-horizon] element each scroll frame.
 * Use the variable as a transform.
 */
[data-horizon] {
  will-change: transform;
  transform: translateY(var(--hoc-horizon-offset, 0));
}

/* ── Reduced-motion gate ──────────────────────────────────────────────
 * Honor accessibility preference globally. Reveal items show immediately,
 * tab-crossfade snaps, marquee pauses, hover-lift becomes pure shadow
 * change, sticky-peek loses the transform, horizon loses the parallax.
 */
@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  [data-tab-panel],
  [data-tab-panel][data-tab-active] {
    transition: none !important;
    transform: none !important;
  }
  [data-marquee-track] {
    animation: none !important;
  }
  [data-lift] {
    transition: box-shadow var(--hoc-dur-quick) var(--hoc-ease-standard) !important;
  }
  [data-lift]:hover {
    transform: none !important;
  }
  [data-peek] {
    transition: box-shadow var(--hoc-dur-medium) var(--hoc-ease-standard) !important;
  }
  [data-peek][data-peek-hidden] {
    transform: none !important;
  }
  [data-horizon] {
    transform: none !important;
  }
}