/* ============================================================
   STUDY-QUIZ — Playful Bouncy Design System
   Theme: Sunset Confetti (dark)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,700;9..144,900&family=Nunito:wght@400;600;700;800;900&family=Caveat:wght@600;700&family=DM+Mono:wght@400;500&display=swap');

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* shared tokens */
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --shadow-soft: 0 12px 32px -10px rgba(0,0,0,0.18), 0 2px 6px -2px rgba(0,0,0,0.08);

  /* spring durations */
  --t-fast: 140ms;
  --t-spring: 480ms;
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out-soft: cubic-bezier(0.22, 1, 0.36, 1);

  /* Sunset Confetti — Dark (Twilight Desert) */
  --bg: #1B1530;
  --bg-tint: #25204A;
  --surface: #2E2952;
  --surface-2: #3A3568;
  --ink: #FFF3E4;
  --ink-soft: #D9C9D8;
  --muted: #8E85A8;
  --line: transparent;

  --primary: #FF8A5C;       /* warm coral, glowing */
  --primary-ink: #1B1530;
  --secondary: #FFB97A;     /* peach */
  --tertiary: #FFD86B;      /* honey */
  --accent: #E27387;

  --correct: #6FCB8E;
  --correct-bg: #1F3528;
  --incorrect: #F77272;
  --incorrect-bg: #3A1F22;
  --warn: #F4A261;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Nunito', system-ui, sans-serif;
  --font-mono: 'DM Mono', ui-monospace, monospace;
  --font-hand: 'Caveat', cursive;

  --outline-width: 0px;
  --shadow-pop: 0 14px 28px -10px rgba(0,0,0,0.6), 0 4px 8px -4px rgba(0,0,0,0.4);
  --shadow-pop-sm: 0 6px 14px -6px rgba(0,0,0,0.5);
  --noise-opacity: 0.04;
}

/* ============================================================
   BASE
   ============================================================ */
html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  font-weight: 600;
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background var(--t-fast) ease, color var(--t-fast) ease;
}

/* paper noise */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: var(--noise-opacity, 0);
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.5 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
}

#app {
  height: 100vh;
  width: 100vw;
  overflow: auto;
  position: relative;
  z-index: 1;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-wrap: balance;
  margin: 0;
}
p { margin: 0; }
h1 { line-height: 1.08; }

.font-hand { font-family: var(--font-hand); font-weight: 700; }
.font-mono { font-family: var(--font-mono); font-weight: 500; }

/* ============================================================
   COMPONENTS — buttons, cards, chips
   ============================================================ */

/* the workhorse button — quiet press with a tiny step-down */
.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 22px;
  font: inherit;
  font-weight: 800;
  font-size: 15px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: var(--outline-width) solid var(--line);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-pop-sm);
  cursor: pointer;
  transition: transform 120ms var(--ease-out-soft), box-shadow 120ms var(--ease-out-soft), background 160ms ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  text-decoration: none;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px -10px rgba(0,0,0,0.55), 0 3px 6px -3px rgba(0,0,0,0.4);
}
.btn:active, .btn.is-pressed {
  transform: translateY(2px) scale(0.985);
  box-shadow: 0 2px 6px -3px rgba(0,0,0,0.5);
  transition-duration: 60ms;
}
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  --btn-bg: var(--primary);
  --btn-fg: var(--primary-ink);
}
.btn-secondary { --btn-bg: var(--secondary); --btn-fg: var(--ink); }
.btn-tertiary  { --btn-bg: var(--tertiary);  --btn-fg: var(--ink); }
.btn-ghost {
  --btn-bg: transparent;
  box-shadow: none;
  border-color: transparent;
}
.btn-ghost:hover { background: var(--surface-2); transform: none; box-shadow: none; }
.btn-ghost:active { transform: scale(0.96); }

.btn-sm  { padding: 8px 14px;  font-size: 13px; }
.btn-lg  { padding: 18px 30px; font-size: 17px; }
.btn-xl  { padding: 22px 36px; font-size: 20px; }

/* the chunky card */
.card {
  background: var(--surface);
  border: var(--outline-width) solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-pop);
  transition: transform var(--t-fast) var(--ease-out-soft), box-shadow var(--t-fast) var(--ease-out-soft);
}

.card-tap {
  cursor: pointer;
}
.card-tap:hover {
  transform: translate(-2px, -3px);
  box-shadow: 0 9px 0 var(--line);
}
.card-tap:active {
  transform: translate(0, 4px);
  box-shadow: 0 2px 0 var(--line);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--ink-soft);
  border: var(--outline-width) solid var(--line);
}
.chip-primary  { background: var(--primary);   color: var(--primary-ink); }
.chip-secondary{ background: var(--secondary); color: var(--ink); }
.chip-tertiary { background: var(--tertiary);  color: var(--ink); }
.chip-correct  { background: var(--correct-bg); color: var(--correct); border-color: var(--correct); }
.chip-wrong    { background: var(--incorrect-bg); color: var(--incorrect); border-color: var(--incorrect); }

/* progress bar — bouncy */
.bar {
  height: 18px;
  background: var(--surface-2);
  border: var(--outline-width) solid var(--line);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}
.bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: var(--radius-pill);
  transform-origin: left center;
  transition: width 800ms var(--ease-out-soft), background 200ms ease;
  position: relative;
}
.bar-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.35) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: shimmer 2.4s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
   ANIMATIONS — creature-quiet motion vocabulary
   ============================================================ */

@keyframes pop-in {
  0%   { transform: translateY(8px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}
.pop-in { animation: pop-in 360ms var(--ease-out-soft) both; }

/* button press: tiny step-down rather than squish */
@keyframes squish {
  0%   { transform: translateY(0); }
  50%  { transform: translateY(2px) scaleY(0.97); }
  100% { transform: translateY(0); }
}
.squish { animation: squish 220ms var(--ease-out-soft); }

/* mascot acknowledgement nod */
@keyframes wiggle {
  0%, 100% { transform: rotate(0deg); }
  30% { transform: rotate(-3deg); }
  70% { transform: rotate(3deg); }
}
.wiggle { animation: wiggle 520ms ease-in-out; }

/* feedback shake — softer */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-3px); }
  40%, 80% { transform: translateX(3px); }
}
.shake { animation: shake 360ms ease-in-out; }

/* ambient breathing — Lucius's idle */
@keyframes breathe {
  0%, 100% { transform: translateY(0) scale(1, 1); }
  50%      { transform: translateY(-2px) scale(1.015, 0.985); }
}
.float-y { animation: breathe 4.4s ease-in-out infinite; }
.breathe { animation: breathe 4.4s ease-in-out infinite; }

/* ====== Lucius reaction animations — quieter, more creature ====== */

/* small celebratory hop */
@keyframes jump-cheer {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  35%      { transform: translateY(-10px) rotate(-3deg); }
  60%      { transform: translateY(0) rotate(2deg); }
  80%      { transform: translateY(-3px) rotate(0deg); }
}
.jump-cheer { animation: jump-cheer 1.6s var(--ease-out-soft) infinite; }

/* soft sympathetic sway */
@keyframes head-shake {
  0%, 100% { transform: rotate(0deg); }
  50%      { transform: rotate(-2deg); }
}
.head-shake { animation: head-shake 2.4s ease-in-out infinite; }

/* hand wave — gentle bob */
@keyframes wave-body {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-2px) rotate(-2deg); }
}
.wave-body { animation: wave-body 2.6s ease-in-out infinite; }

/* dance — slow happy sway */
@keyframes dance {
  0%, 100% { transform: translate(0, 0) rotate(-2deg); }
  50%      { transform: translate(2px, -3px) rotate(3deg); }
}
.dance { animation: dance 1.6s ease-in-out infinite; }

/* yawn — long slow breath */
@keyframes yawn-breathe {
  0%, 100% { transform: scale(1, 1); }
  50%      { transform: scale(1.025, 0.975); }
}
.yawn-breathe { animation: yawn-breathe 4s ease-in-out infinite; }

/* sad droop */
@keyframes droop {
  0%, 100% { transform: translateY(1px) rotate(0); }
  50%      { transform: translateY(3px) rotate(-1deg); }
}
.droop { animation: droop 3.4s ease-in-out infinite; }

/* fire-streak — eager but not jittery */
@keyframes fire-vibe {
  0%, 100% { transform: translateY(-1px) rotate(-1deg); }
  50%      { transform: translateY(-4px) rotate(1deg); }
}
.fire-vibe { animation: fire-vibe 0.9s ease-in-out infinite; }

/* eager hop for ready */
@keyframes ready-hop {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-5px); }
}
.ready-hop { animation: ready-hop 1.1s var(--ease-out-soft) infinite; }

/* sweat drop drip */
@keyframes drip {
  0%   { transform: translateY(0); opacity: 0; }
  20%  { opacity: 1; }
  100% { transform: translateY(18px); opacity: 0; }
}
.drip { animation: drip 1.4s ease-in infinite; }

/* shimmer for trophy */
@keyframes shine {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}
.shine { animation: shine 1.2s ease-in-out infinite; }

/* sparkle pulse */
@keyframes sparkle-pop {
  0%, 100% { transform: scale(0.8); opacity: 0.6; }
  50%      { transform: scale(1.2); opacity: 1; }
}
.sparkle-pop { animation: sparkle-pop 1.4s ease-in-out infinite; transform-origin: center; }

@keyframes spin-slow {
  to { transform: rotate(360deg); }
}
.spin-slow { animation: spin-slow 18s linear infinite; }

/* leaf / petal drift — slower, softer than confetti */
@keyframes leaf-drift {
  0%   { transform: translate(0, -24px) rotate(0deg); opacity: 0; }
  10%  { opacity: 1; }
  100% { transform: translate(var(--cx, 0px), 110vh) rotate(var(--cr, 360deg)); opacity: 0; }
}
.leaf-drift {
  animation: leaf-drift var(--cd, 2800ms) cubic-bezier(0.3, 0.4, 0.5, 1) forwards;
}

/* ============================================================
   UTILS
   ============================================================ */
.row { display: flex; }
.col { display: flex; flex-direction: column; }
.stack-tight > * + * { margin-top: 8px; }
.stack > * + * { margin-top: 16px; }
.stack-lg > * + * { margin-top: 28px; }
.center { display: flex; align-items: center; justify-content: center; }

.scroll-y { overflow-y: auto; }
.scroll-y::-webkit-scrollbar { width: 8px; }
.scroll-y::-webkit-scrollbar-thumb { background: var(--ink-soft); border-radius: 4px; }

input[type="checkbox"], input[type="radio"] { accent-color: var(--primary); }

::selection { background: var(--primary); color: var(--primary-ink); }

/* focus ring */
:focus-visible {
  outline: 3px dashed var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
   MOBILE — narrow viewport overrides (≤720px)
   ============================================================ */
@media (max-width: 720px) {
  body { font-size: 15px; }

  .btn     { padding: 12px 18px; font-size: 14px; }
  .btn-sm  { padding: 7px 12px;  font-size: 12px; }
  .btn-lg  { padding: 14px 22px; font-size: 15px; }
  .btn-xl  { padding: 16px 24px; font-size: 16px; }

  .card    { padding: 18px; border-radius: 22px; }
  .chip    { padding: 5px 10px; font-size: 11px; }
}

@media (max-width: 480px) {
  .card    { padding: 14px; border-radius: 18px; }
}

/* respect iOS safe areas when launched standalone (Dynamic Island, home indicator) */
@supports (padding: max(0px)) {
  #app {
    padding-top: env(safe-area-inset-top);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    padding-bottom: env(safe-area-inset-bottom);
  }
}