/* Motion graphics: background canvases, page transitions, scroll reveals,
   quiz effects and micro-interactions. Everything that moves is gated on
   html[data-motion="full"], which motion.js sets only when the OS "reduce
   motion" setting and the in-app «Спокійний режим» both allow it. */

:root {
  --c-rose: #C23D5C;
  --c-rose-soft: #E8798F;
  --c-rose-tint: #FDEBEF;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}
:root[data-theme="dark"] {
  --c-rose: #F2A0B0;
  --c-rose-soft: #E8798F;
  --c-rose-tint: #3A2230;
}

/* ---------- Layers ---------- */
.bg-canvas, .fx-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
}
.bg-canvas { z-index: 0; }
.fx-canvas { z-index: 45; }
.app-shell { position: relative; z-index: 1; }

/* Glassy chrome so the garden shows through. */
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .sidebar, .bottom-nav {
    background: color-mix(in srgb, var(--c-surface) 78%, transparent);
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
    backdrop-filter: blur(14px) saturate(1.2);
  }
}

/* Reading-progress stem with a rose bud riding its tip. */
.scroll-stem {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 30;
  pointer-events: none;
}
.scroll-stem > span {
  position: absolute;
  inset: 0;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--c-teal-soft), var(--c-rose-soft));
  border-radius: 0 3px 3px 0;
}
.scroll-stem > i {
  position: absolute;
  top: -4px;
  left: -6px;
  width: 11px;
  height: 11px;
  border-radius: 50% 0 50% 50%;
  background: var(--c-rose-soft);
  box-shadow: 0 0 10px color-mix(in srgb, var(--c-rose-soft) 70%, transparent);
}
:root[data-motion="reduced"] .scroll-stem > i { display: none; }

/* ---------- Page transitions ---------- */
#main { view-transition-name: page; }
::view-transition-old(page) { animation: page-out 220ms var(--ease) both; }
::view-transition-new(page) { animation: page-in 520ms var(--ease-out) both; }
::view-transition-old(root), ::view-transition-new(root) { animation: none; }
@keyframes page-out {
  to { opacity: 0; transform: translateY(-10px) scale(0.985); filter: blur(4px); }
}
@keyframes page-in {
  from { opacity: 0; transform: translateY(18px) scale(0.99); filter: blur(6px); }
}
/* Fallback for browsers without View Transitions. */
:root[data-motion="full"] .view-enter { animation: page-in 480ms var(--ease-out) both; }
:root[data-motion="reduced"] .view-enter { animation: none; }

/* ---------- Scroll reveals ---------- */
:root[data-motion="full"] .reveal:not(.is-in) {
  opacity: 0;
  transform: translateY(22px) scale(0.985);
}
:root[data-motion="full"] .reveal.is-in {
  animation: reveal-in 640ms var(--ease-out) both;
  animation-delay: var(--reveal-delay, 0ms);
}
@keyframes reveal-in {
  from { opacity: 0; transform: translateY(22px) scale(0.985); filter: blur(3px); }
  to { opacity: 1; transform: none; filter: none; }
}
@media print { .reveal { opacity: 1 !important; transform: none !important; } }

/* Headings get a petal-coloured underline that draws in. */
:root[data-motion="full"] .prose h2.reveal { position: relative; }
:root[data-motion="full"] .prose h2.reveal::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 56px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-rose-soft), transparent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 900ms var(--ease-out) 250ms;
}
:root[data-motion="full"] .prose h2.reveal.is-in::after { transform: scaleX(1); }

/* ---------- Micro-interactions ---------- */
:root[data-motion="full"] .card,
:root[data-motion="full"] .quiz-item {
  transition: transform 260ms var(--ease-out), box-shadow 260ms var(--ease-out), border-color var(--dur) var(--ease);
}
@media (hover: hover) {
  :root[data-motion="full"] a.card:hover,
  :root[data-motion="full"] .card.example:hover,
  :root[data-motion="full"] .flower-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow), 0 12px 28px -14px color-mix(in srgb, var(--c-rose-soft) 55%, transparent);
  }
  :root[data-motion="full"] .option:hover { transform: translateX(3px); }
}
:root[data-motion="full"] .option {
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform 220ms var(--ease-out);
}

:root[data-motion="full"] .btn {
  position: relative;
  overflow: hidden;
  transition: background var(--dur) var(--ease), transform 160ms var(--ease-spring), box-shadow var(--dur) var(--ease);
}
:root[data-motion="full"] .btn:active { transform: scale(0.96); }
:root[data-motion="full"] .btn:not(.btn-ghost):not(.btn-danger)::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  pointer-events: none;
}
@media (hover: hover) {
  :root[data-motion="full"] .btn:not(.btn-ghost):not(.btn-danger):hover::after {
    transform: translateX(120%);
    transition: transform 700ms var(--ease-out);
  }
}

/* Progress bars fill with a moving sheen. */
:root[data-motion="full"] .progress > span {
  transition: width 1100ms var(--ease-out);
  background-image: linear-gradient(110deg, transparent 35%, rgba(255, 255, 255, 0.35) 50%, transparent 65%);
  background-size: 220% 100%;
  animation: sheen 2.8s linear infinite;
}
@keyframes sheen { from { background-position: 120% 0; } to { background-position: -120% 0; } }

/* Brand mark breathes gently. */
:root[data-motion="full"] .brand-mark { animation: breathe 6s ease-in-out infinite; }
@keyframes breathe { 50% { transform: scale(1.06) rotate(-3deg); } }

/* ---------- Flower metaphor card ---------- */
.flower-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s2);
  align-items: start;
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--c-rose-tint) 100%, transparent), transparent 60%),
    var(--c-surface);
  border-color: color-mix(in srgb, var(--c-rose-soft) 35%, var(--c-border));
  overflow: hidden;
}
.flower-card::before {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--c-rose-soft) 22%, transparent), transparent 70%);
  pointer-events: none;
}
.flower-card__bloom {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--c-rose-tint);
  color: var(--c-rose);
}
.flower-card__eyebrow { color: var(--c-rose); }
.flower-card h2 { font-family: var(--font-serif); font-weight: 600; }
.flower-card__body > :last-child { margin-bottom: 0; }
@media (max-width: 480px) {
  .flower-card { grid-template-columns: 1fr; gap: var(--s1); }
  .flower-card__bloom { width: 60px; height: 60px; }
  .flower-card__bloom .icon { width: 44px; height: 44px; }
}
/* The rose draws itself, then sways. */
:root[data-motion="full"] .flower-card.reveal:not(.was-seen) .icon path,
:root[data-motion="full"] .flower-card.was-seen .icon path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}
:root[data-motion="full"] .flower-card.was-seen .icon path {
  animation: draw 1.6s var(--ease-out) forwards;
}
:root[data-motion="full"] .flower-card.was-seen .icon path:nth-child(2n) { animation-delay: 180ms; }
:root[data-motion="full"] .flower-card.was-seen .icon path:nth-child(3n) { animation-delay: 360ms; }
:root[data-motion="full"] .flower-card.was-seen .icon {
  transform-origin: 50% 95%;
  animation: sway 5s ease-in-out 1.6s infinite;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes sway { 0%, 100% { transform: rotate(-4deg); } 50% { transform: rotate(4deg); } }

/* ---------- Quiz effects ---------- */
:root[data-motion="full"] .option.fx-bloom { animation: bloom-pop 700ms var(--ease-spring); }
@keyframes bloom-pop {
  0% { transform: scale(1); box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-rose-soft) 60%, transparent); }
  35% { transform: scale(1.035); }
  100% { transform: scale(1); box-shadow: 0 0 0 14px transparent; }
}
.option.is-correct { position: relative; }
:root[data-motion="full"] .option.is-correct { padding-right: 44px; }
:root[data-motion="full"] .option.is-correct::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 18px;
  height: 18px;
  margin-top: -9px;
  border-radius: 50% 0 50% 50%;
  background: var(--c-rose-soft);
  transform: rotate(-45deg) scale(0);
  animation: bud 600ms var(--ease-spring) 250ms forwards;
}
@keyframes bud { to { transform: rotate(-45deg) scale(1); } }

:root[data-motion="full"] .option.fx-wilt { animation: wilt 820ms var(--ease-out); transform-origin: 50% 0; }
@keyframes wilt {
  0% { transform: none; filter: none; }
  15% { transform: translateX(-6px) rotate(-0.6deg); }
  30% { transform: translateX(5px) rotate(0.5deg); }
  45% { transform: translateX(-3px); }
  70% { transform: translateY(3px) rotate(0.4deg); filter: saturate(0.5); }
  100% { transform: none; filter: none; }
}

:root[data-motion="full"] .quiz-item.fx-nudge { animation: nudge 1.2s var(--ease-out); }
@keyframes nudge {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-focus) 55%, transparent); transform: none; }
  12% { transform: translateY(-4px); }
  24% { transform: translateY(0); }
  36% { transform: translateY(-2px); }
  48% { transform: none; }
  100% { box-shadow: 0 0 0 18px transparent; }
}
/* In calm mode, unanswered cards still get a clear (static) outline. */
.quiz-item.fx-nudge { border-color: var(--c-focus); }

.card.fx-bloom { animation: card-bloom 900ms var(--ease-spring); }
:root[data-motion="reduced"] .card.fx-bloom { animation: none; }
@keyframes card-bloom {
  0% { transform: scale(0.98); box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-rose-soft) 50%, transparent); }
  50% { transform: scale(1.015); }
  100% { transform: none; box-shadow: 0 0 0 20px transparent; }
}

:root[data-motion="full"] .result-card { animation: result-in 700ms var(--ease-spring) both; }
@keyframes result-in { from { opacity: 0; transform: translateY(16px) scale(0.96); } }
.result-score { font-variant-numeric: tabular-nums; }