/**
 * LabScope Motion System — Phase A foundation
 *
 * Content is visible without JS. Motion activates on html.pp-motion-idle only.
 */

:root {
  --pp-motion-instant: 120ms;
  --pp-motion-fast: 200ms;
  --pp-motion-base: 240ms;
  --pp-motion-slow: 360ms;
  --pp-motion-reveal: 480ms;
  --pp-motion-emphasis: 600ms;
  --pp-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --pp-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --pp-ease-linear: linear;
  --pp-motion-stagger: 40ms;
}

/* --- Page boot (session fade) --- */
html.pp-motion-boot body {
  opacity: 0;
}

html.pp-motion-ready body {
  opacity: 1;
  transition: opacity var(--pp-motion-fast) var(--pp-ease-out);
}

/* --- View transition chrome (progressive) --- */
@supports (view-transition-name: none) {
  .pp-view-header {
    view-transition-name: pp-header;
  }

  .pp-view-footer {
    view-transition-name: pp-footer;
  }

  .pp-motion-main {
    view-transition-name: pp-main;
  }
}

::view-transition-old(pp-main),
::view-transition-new(pp-main) {
  animation-duration: var(--pp-motion-base);
  animation-timing-function: var(--pp-ease-in-out);
}

::view-transition-old(pp-header),
::view-transition-new(pp-header),
::view-transition-old(pp-footer),
::view-transition-new(pp-footer) {
  animation-duration: var(--pp-motion-fast);
}

/* --- Header scroll (sentinel-driven, all headers) --- */
.pp-header-sentinel {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
  visibility: hidden;
}

.pp-header {
  transition:
    background-color var(--pp-motion-fast) var(--pp-ease-in-out),
    box-shadow var(--pp-motion-fast) var(--pp-ease-in-out),
    border-color var(--pp-motion-fast) var(--pp-ease-in-out);
}

.pp-header.is-scrolled {
  box-shadow: 0 10px 30px color-mix(in srgb, var(--pp-dark) 8%, transparent);
}

.pp-header--premium.is-scrolled {
  box-shadow: 0 12px 36px color-mix(in srgb, var(--pp-primary) 10%, transparent);
}

/* --- Focus polish --- */
.pp-motion :is(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--pp-primary);
  outline-offset: 3px;
  transition: outline-offset var(--pp-motion-fast) var(--pp-ease-out);
}

/* --- Internal link press feedback --- */
.pp-motion-link {
  transition: opacity var(--pp-motion-instant) var(--pp-ease-out);
}

.pp-motion-link:active {
  opacity: 0.82;
}

/* --- Reveal system (idle-gated) --- */
.pp-reveal {
  opacity: 1;
  transform: none;
  filter: none;
  will-change: auto;
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal:not(.pp-revealed) {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--pp-motion-reveal) var(--pp-ease-out),
    transform var(--pp-motion-reveal) var(--pp-ease-out),
    filter var(--pp-motion-reveal) var(--pp-ease-out);
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal--fade:not(.pp-revealed) {
  transform: none;
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal--scale:not(.pp-revealed) {
  transform: scale(0.98);
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal--left:not(.pp-revealed) {
  transform: translateX(-12px);
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal--rise:not(.pp-revealed) {
  transform: translateY(24px);
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-reveal.pp-revealed {
  opacity: 1;
  transform: none;
  filter: none;
}

/* Grid stagger (first 6) */
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(1):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 0); }
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(2):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 1); }
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(3):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 2); }
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(4):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 3); }
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(5):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 4); }
html.pp-motion-idle:not(.pp-reduced-motion) .pp-grid > .pp-reveal:nth-child(6):not(.pp-revealed) { transition-delay: calc(var(--pp-motion-stagger) * 5); }

/* Orchestrated hero (signature — session gated via JS class on html) */
html.pp-motion-idle.pp-motion-hero:not(.pp-reduced-motion) .pp-motion-hero__media {
  opacity: 0;
  transform: translateX(-12px);
  transition:
    opacity var(--pp-motion-reveal) var(--pp-ease-out),
    transform var(--pp-motion-reveal) var(--pp-ease-out);
}

html.pp-motion-idle.pp-motion-hero:not(.pp-reduced-motion) .pp-motion-hero__content {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--pp-motion-reveal) var(--pp-ease-out) 80ms,
    transform var(--pp-motion-reveal) var(--pp-ease-out) 80ms;
}

html.pp-motion-idle.pp-motion-hero.is-hero-revealed:not(.pp-reduced-motion) .pp-motion-hero__media,
html.pp-motion-idle.pp-motion-hero.is-hero-revealed:not(.pp-reduced-motion) .pp-motion-hero__content {
  opacity: 1;
  transform: none;
}

@media (min-width: 768px) {
  html.pp-motion-idle.pp-motion-hero:not(.pp-reduced-motion) .pp-hero__media img,
  html.pp-motion-idle.pp-motion-hero:not(.pp-reduced-motion) .pp-hero__media .pp-hero__fallback-image {
    transform: scale(1);
    transition: transform 8s var(--pp-ease-out);
  }

  html.pp-motion-idle.pp-motion-hero.is-hero-revealed:not(.pp-reduced-motion) .pp-hero__card:hover .pp-hero__media img,
  html.pp-motion-idle.pp-motion-hero.is-hero-revealed:not(.pp-reduced-motion) .pp-hero__card:hover .pp-hero__media .pp-hero__fallback-image {
    transform: scale(1.04);
  }
}

/* Section eyebrow line (editorial rhythm) */
html.pp-motion-idle:not(.pp-reduced-motion) .pp-section__heading .pp-section__title {
  position: relative;
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-section.pp-revealed .pp-section__title::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  margin-top: 0.65rem;
  background: linear-gradient(90deg, var(--pp-primary), var(--pp-accent));
  border-radius: 999px;
  transform: scaleX(0);
  transform-origin: left center;
  animation: pp-motion-line-grow var(--pp-motion-reveal) var(--pp-ease-out) forwards;
}

@keyframes pp-motion-line-grow {
  to { transform: scaleX(1); }
}

/* Archive masthead band */
.pp-archive-header.pp-reveal {
  position: relative;
}

html.pp-motion-idle:not(.pp-reduced-motion) .pp-archive-header.pp-revealed::before {
  content: "";
  position: absolute;
  inset: -1.5rem -1rem auto;
  height: calc(100% + 2rem);
  background: color-mix(in srgb, var(--pp-primary) 6%, transparent);
  border-radius: calc(var(--pp-radius) + 4px);
  z-index: -1;
  animation: pp-motion-band-in var(--pp-motion-slow) var(--pp-ease-out) forwards;
}

@keyframes pp-motion-band-in {
  from { opacity: 0; transform: scaleX(0.92); transform-origin: left center; }
  to { opacity: 1; transform: scaleX(1); }
}

/* Cards — unified lift (functional layer always on for .pp-motion) */
.pp-motion .pp-card {
  transition:
    transform var(--pp-motion-base) var(--pp-ease-out),
    box-shadow var(--pp-motion-base) var(--pp-ease-out),
    border-color var(--pp-motion-base) var(--pp-ease-out);
}

.pp-motion .pp-card:hover {
  transform: translateY(-4px);
}

.pp-motion .pp-card:active {
  transform: translateY(-1px) scale(0.995);
  transition-duration: var(--pp-motion-instant);
}

.pp-motion .pp-card__read-more,
.pp-motion .pp-section__link {
  transition: gap var(--pp-motion-fast) var(--pp-ease-out), color var(--pp-motion-fast) var(--pp-ease-out);
}

/* Search modal motion */
.pp-search-modal {
  transition: opacity var(--pp-motion-base) var(--pp-ease-out);
}

.pp-search-modal:not([hidden]) {
  animation: pp-motion-fade-in var(--pp-motion-base) var(--pp-ease-out);
}

.pp-search-modal__panel {
  transition: transform var(--pp-motion-base) var(--pp-ease-out), opacity var(--pp-motion-base) var(--pp-ease-out);
}

.pp-search-modal:not([hidden]) .pp-search-modal__panel {
  animation: pp-motion-scale-in var(--pp-motion-base) var(--pp-ease-out);
}

@keyframes pp-motion-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pp-motion-scale-in {
  from { opacity: 0; transform: scale(0.98) translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* Mobile nav stagger */
.pp-nav.is-opening .pp-nav__list > li {
  opacity: 0;
  transform: translateY(8px);
  animation: pp-motion-nav-in var(--pp-motion-base) var(--pp-ease-out) forwards;
}

.pp-nav.is-opening .pp-nav__list > li:nth-child(1) { animation-delay: 0ms; }
.pp-nav.is-opening .pp-nav__list > li:nth-child(2) { animation-delay: 40ms; }
.pp-nav.is-opening .pp-nav__list > li:nth-child(3) { animation-delay: 80ms; }
.pp-nav.is-opening .pp-nav__list > li:nth-child(4) { animation-delay: 120ms; }
.pp-nav.is-opening .pp-nav__list > li:nth-child(5) { animation-delay: 160ms; }

@keyframes pp-motion-nav-in {
  to { opacity: 1; transform: none; }
}

/* Consent banner */
.pp-consent:not([hidden]) {
  animation: pp-motion-consent-in var(--pp-motion-slow) var(--pp-ease-out);
}

.pp-consent.is-dismissed {
  animation: pp-motion-consent-out var(--pp-motion-base) var(--pp-ease-out) forwards;
}

@keyframes pp-motion-consent-in {
  from { opacity: 0; transform: translateY(100%); }
  to { opacity: 1; transform: none; }
}

@keyframes pp-motion-consent-out {
  to { opacity: 0; transform: translateY(100%); }
}

body.pp-motion-consent-open {
  padding-bottom: var(--pp-consent-height, 0px);
  transition: padding-bottom var(--pp-motion-base) var(--pp-ease-out);
}

/* Skeleton shimmer (search / async) */
.pp-motion-skeleton {
  position: relative;
  overflow: hidden;
  background: color-mix(in srgb, var(--pp-border) 40%, var(--pp-surface));
  border-radius: calc(var(--pp-radius) + 2px);
  min-height: 220px;
}

.pp-motion-skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--pp-surface) 70%, transparent),
    transparent
  );
  animation: pp-motion-shimmer 1.2s var(--pp-ease-in-out) infinite;
}

@keyframes pp-motion-shimmer {
  100% { transform: translateX(100%); }
}

/* Theme icon swap */
.pp-theme-icon {
  transition:
    opacity var(--pp-motion-instant) var(--pp-ease-out),
    transform var(--pp-motion-instant) var(--pp-ease-out);
}

.pp-dark-toggle:active .pp-theme-icon {
  transform: scale(0.88) rotate(12deg);
}

/* Reduced motion */
html.pp-reduced-motion *,
html.pp-reduced-motion *::before,
html.pp-reduced-motion *::after {
  animation: none !important;
  transition: none !important;
  scroll-behavior: auto !important;
}

html.pp-reduced-motion .pp-reveal {
  opacity: 1 !important;
  transform: none !important;
  filter: none !important;
}

@media (prefers-reduced-motion: reduce) {
  html.pp-motion-boot body {
    opacity: 1;
  }
}