/* Brynn Math — warm, cartoony playground vibe */
:root {
  --sky: #7ec4e8;
  --sky-deep: #4aa3d5;
  --grass: #8fd694;
  --grass-dark: #5cb85c;
  --sun: #ffd966;
  --sun-deep: #f5b041;
  --coral: #ff9a8b;
  --lavender: #c4a8ff;
  --cream: #fff8ee;
  --ink: #2d3436;
  --ink-soft: #636e72;
  --white: #ffffff;
  --shadow: rgba(45, 52, 54, 0.12);
  --shadow-strong: rgba(45, 52, 54, 0.2);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  /* Home · Race · Learn toolbar — shared rainbow fill */
  --play-toolbar-rainbow: linear-gradient(
    92deg,
    #ff8a9a 0%,
    #ffb07a 14%,
    #ffd666 28%,
    #b8e86e 42%,
    #6ee7d8 56%,
    #6eb8ff 70%,
    #9b8cff 84%,
    #e89ae8 100%
  );
  /* Question / race prompt boxes: rainbow frame + soft rainbow wash inside */
  --question-rainbow-frame: linear-gradient(
    135deg,
    #ff8a9a 0%,
    #ffb07a 12%,
    #ffd666 26%,
    #b8e86e 40%,
    #6ee7d8 54%,
    #6eb8ff 68%,
    #9b8cff 82%,
    #e89ae8 96%,
    #ff8a9a 100%
  );
  /* Inner wash for cards & “squares” — stronger rainbow bands, still readable */
  --question-rainbow-fill: linear-gradient(
    155deg,
    #fff0f2 0%,
    #fff8e0 14%,
    #e9ffec 28%,
    #dff6ff 42%,
    #eee8ff 56%,
    #ffe8f5 70%,
    #fff0e6 84%,
    #fff5fb 100%
  );
  /* Badges, streak dots — full hue wheel */
  --rainbow-conic: conic-gradient(
    from 220deg,
    #ff8a9a,
    #ffd666,
    #b8e86e,
    #6ee7d8,
    #6eb8ff,
    #9b8cff,
    #e89ae8,
    #ff8a9a
  );
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 106%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  min-height: -webkit-fill-available;
  font-family: "Nunito", system-ui, sans-serif;
  font-weight: 700;
  color: var(--ink);
  /* Full rainbow sweep (red → violet), still soft for little eyes */
  background: linear-gradient(
    118deg,
    #ff8a9a 0%,
    #ffb07a 11%,
    #ffd666 22%,
    #b8e86e 33%,
    #6ee7d8 44%,
    #6eb8ff 55%,
    #9b8cff 66%,
    #e89ae8 77%,
    #ff8a9a 88%,
    #ffd666 100%
  );
  background-attachment: fixed;
  background-size: 220% 220%;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: no-preference) {
  body {
    animation: rainbow-shift 28s ease-in-out infinite alternate;
  }
}

@keyframes rainbow-shift {
  0% {
    background-position: 0% 40%;
  }
  100% {
    background-position: 100% 60%;
  }
}

.bg-doodles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(255, 255, 255, 0.45) 0%, transparent 28%),
    radial-gradient(circle at 88% 12%, rgba(255, 255, 255, 0.35) 0%, transparent 24%),
    radial-gradient(circle at 78% 78%, rgba(255, 255, 255, 0.3) 0%, transparent 32%),
    radial-gradient(circle at 8% 85%, rgba(255, 255, 255, 0.25) 0%, transparent 30%),
    linear-gradient(
      125deg,
      rgba(255, 138, 154, 0.12) 0%,
      rgba(255, 214, 102, 0.1) 25%,
      rgba(110, 231, 216, 0.1) 50%,
      rgba(110, 184, 255, 0.12) 75%,
      rgba(232, 154, 232, 0.1) 100%
    );
}

.site-header,
#app,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  text-align: center;
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 1.25rem
    max(1rem, env(safe-area-inset-left));
}

.logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/*
 * Header meteors: gradient tail + slide, adapted from the common “Only CSS shooting star”
 * pattern (widely shared; e.g. Yusuke Nakaya on CodePen). Warm colors for this app.
 */
.logo-meteor {
  position: relative;
  width: clamp(3.1rem, 8.5vw, 4.15rem);
  height: clamp(2.35rem, 6.5vw, 3.1rem);
  flex-shrink: 0;
  overflow: visible;
  pointer-events: none;
}

.logo-meteor--right {
  transform: scaleX(-1);
}

.meteor-streak {
  position: absolute;
  left: -5%;
  top: 42%;
  height: 2px;
  width: 0;
  border-radius: 999px;
  transform-origin: left center;
  transform: rotate(-36deg);
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 236, 180, 0.75) 45%,
    #fffef5 85%,
    #ffffff 100%
  );
  filter: drop-shadow(0 0 5px rgba(255, 220, 140, 0.95)) drop-shadow(0 0 10px rgba(126, 196, 232, 0.45));
  animation: meteor-tail 2.75s ease-in-out infinite, meteor-slide 2.75s ease-in-out infinite;
}

.meteor-streak::before {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: clamp(0.95rem, 3vw, 1.2rem);
  height: clamp(0.95rem, 3vw, 1.2rem);
  transform: translate(42%, -50%);
  border-radius: 1px;
  /* Five-point star — easy to read at the head of the streak */
  clip-path: polygon(
    50% 0%,
    61% 32%,
    98% 32%,
    69% 54%,
    80% 96%,
    50% 72%,
    20% 96%,
    31% 54%,
    2% 32%,
    39% 32%
  );
  background: linear-gradient(160deg, #ffffff 0%, #fff8dc 45%, #ffe066 100%);
  box-shadow:
    0 0 10px 4px rgba(255, 235, 180, 0.95),
    0 0 18px 8px rgba(255, 210, 120, 0.55);
  filter: drop-shadow(0 0 4px rgba(255, 220, 140, 0.9));
  opacity: 0;
  animation: meteor-head 2.75s ease-in-out infinite;
}

.logo-meteor--right .meteor-streak,
.logo-meteor--right .meteor-streak::before {
  animation-delay: 1.35s;
}

@keyframes meteor-tail {
  0% {
    width: 0;
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  28% {
    width: 4.25rem;
  }
  62% {
    width: 4.25rem;
    opacity: 1;
  }
  85% {
    width: 0;
    opacity: 0;
  }
  100% {
    width: 0;
    opacity: 0;
  }
}

@keyframes meteor-slide {
  0% {
    transform: rotate(-36deg) translate(0, 0);
  }
  100% {
    transform: rotate(-36deg) translate(1.35rem, 1.1rem);
  }
}

@keyframes meteor-head {
  0%,
  18% {
    opacity: 0;
  }
  26%,
  64% {
    opacity: 1;
  }
  78%,
  100% {
    opacity: 0;
  }
}

.site-title {
  font-family: "Fredoka", "Nunito", sans-serif;
  font-weight: 700;
  font-size: clamp(2.1rem, 6vw, 3rem);
  letter-spacing: 0.02em;
  margin: 0;
  color: var(--ink);
  text-shadow:
    3px 3px 0 var(--white),
    -1px -1px 0 var(--white),
    6px 6px 0 rgba(255, 217, 102, 0.5);
}

.tagline {
  margin: 0.5rem 0 0;
  font-size: 1.05rem;
  font-weight: 800;
  background: var(--play-toolbar-rainbow);
  background-size: 160% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@supports not (background-clip: text) {
  .tagline {
    color: var(--ink-soft);
    background: none;
  }
}

#app {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 max(1rem, env(safe-area-inset-right)) max(2rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
}

.screen {
  display: none;
}

.screen-active {
  display: block;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 1rem;
}

.category-card {
  border: 3px solid transparent;
  cursor: pointer;
  text-align: center;
  padding: 1.35rem 1rem;
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-weight: 800;
  color: var(--ink);
  box-shadow:
    0 6px 0 var(--shadow-strong),
    0 10px 24px var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
  overflow: hidden;
}

.category-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.45), transparent 55%);
  pointer-events: none;
}

.category-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow:
    0 8px 0 var(--shadow-strong),
    0 14px 28px var(--shadow);
}

.category-card:active {
  transform: translateY(2px);
  box-shadow:
    0 3px 0 var(--shadow-strong),
    0 6px 16px var(--shadow);
}

.cat-add {
  background:
    linear-gradient(145deg, #fff5e6, var(--sun)) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
}

.cat-sub {
  background:
    linear-gradient(145deg, #e8f8ff, var(--sky)) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
}

.cat-mul {
  background:
    linear-gradient(145deg, #f3ebff, var(--lavender)) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
}

.cat-div {
  background:
    linear-gradient(145deg, #e8ffe8, var(--grass)) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
}

.cat-icon {
  display: block;
  font-size: 2.25rem;
  margin-bottom: 0.35rem;
  filter: drop-shadow(0 2px 0 rgba(0, 0, 0, 0.08));
}

.cat-name {
  display: block;
  font-family: "Fredoka", sans-serif;
  font-size: 1.25rem;
}

.cat-hint {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-top: 0.25rem;
}

#screen-play {
  padding-top: 0;
}

/* Home · Race · Learn — above streak, on the play screen only */
.play-top {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

/* Streak sits tight above the white play card */
.play-streak-row {
  display: flex;
  justify-content: center;
  margin-bottom: 0.2rem;
  min-height: 0.75rem;
  align-items: center;
}

.btn-back {
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  background: var(--play-toolbar-rainbow);
  background-size: 140% 100%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.85),
    0 0 1px rgba(255, 255, 255, 0.6);
  cursor: pointer;
  box-shadow: 0 4px 0 var(--ink);
  transition: transform 0.1s ease, box-shadow 0.1s ease, filter 0.1s ease;
}

.btn-back:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--ink);
  filter: brightness(1.05) saturate(1.05);
}

.btn-back:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--ink);
}

.streak-badges {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  min-height: 0;
  align-items: center;
}

.streak-dot {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--rainbow-conic);
  border: 3px solid var(--ink);
  box-shadow: 0 2px 0 var(--ink);
}

.btn-learn {
  font-family: "Fredoka", inherit;
  font-weight: 700;
  font-size: 1.15rem;
  padding: 0.5rem 1.6rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  cursor: pointer;
  background: var(--play-toolbar-rainbow);
  background-size: 140% 100%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.85),
    0 0 1px rgba(255, 255, 255, 0.6);
  box-shadow: 0 5px 0 var(--ink);
  transition: transform 0.1s ease, box-shadow 0.1s ease, filter 0.1s ease;
}

.btn-learn:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 0 var(--ink);
  filter: brightness(1.05) saturate(1.05);
}

.btn-learn:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 var(--ink);
}

.learn-dialog {
  box-sizing: border-box;
  max-width: min(94vw, calc(100vw - env(safe-area-inset-left) - env(safe-area-inset-right)));
  width: min(38rem, calc(100vw - env(safe-area-inset-left) - env(safe-area-inset-right) - 1rem));
  max-height: 92dvh;
  padding: 0;
  margin: auto;
  border: none;
  border-radius: var(--radius-lg);
  background: transparent;
}

.learn-dialog::backdrop {
  background: rgba(45, 52, 54, 0.45);
}

.learn-dialog-inner {
  position: relative;
  padding: 2.75rem 1.35rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 4px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  box-shadow: 0 8px 0 var(--ink);
  max-height: min(88dvh, calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 1.5rem));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.learn-dialog-close {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  font-size: 1.5rem;
  line-height: 1;
  font-weight: 700;
  border: 3px solid var(--ink-soft);
  border-radius: 50%;
  background: var(--white);
  color: var(--ink-soft);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.learn-dialog-close:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.learn-dialog-topic {
  font-family: "Fredoka", sans-serif;
  font-size: 1.35rem;
  margin: 0 clamp(4.75rem, 22vw, 6.5rem) 0.35rem;
  color: var(--ink);
  text-align: center;
}

.learn-dialog-meta {
  display: flex;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.learn-step-counter {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--ink-soft);
}

.btn-learn-sound {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: inherit;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  background: var(--play-toolbar-rainbow);
  background-size: 150% 100%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.75),
    0 0 1px rgba(255, 255, 255, 0.45);
  cursor: pointer;
  box-shadow: 0 3px 0 var(--ink);
}

.btn-learn-sound--top {
  position: absolute;
  top: 0.55rem;
  left: 0.65rem;
  z-index: 2;
}

.btn-learn-sound:hover {
  filter: brightness(1.03);
}

.btn-learn-sound[aria-pressed="true"] {
  background: linear-gradient(180deg, #fab1a0, #e17055);
  color: var(--white);
}

.btn-learn-sound:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-learn-sound-icon {
  font-size: 1.1rem;
}

.learn-step-title {
  font-family: "Fredoka", sans-serif;
  font-size: 1.2rem;
  margin: 0 0 0.65rem;
  text-align: center;
  color: var(--ink);
}

.learn-dialog-body {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-soft);
}

.learn-dialog-body > p {
  margin: 0 0 0.75rem;
}

.learn-dialog-body > p:last-child {
  margin-bottom: 0;
}

.learn-demo {
  margin: 1rem 0;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  background:
    linear-gradient(180deg, #ffffff, #f5fbff) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45);
}

.learn-demo-equation {
  font-family: "Fredoka", sans-serif;
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--ink);
}

.learn-demo-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 0.65rem;
}

.learn-demo-label {
  width: 100%;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink-soft);
  margin-bottom: 0.2rem;
}

.learn-demo-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.28rem;
  justify-content: center;
}

.learn-demo-op {
  font-family: "Fredoka", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  padding: 0 0.15rem;
}

.learn-dot {
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  border: 2px solid var(--ink);
  flex-shrink: 0;
}

.learn-dot--a {
  background: #ff8fb8;
}

.learn-dot--b {
  background: #7ec4e8;
}

.learn-dot--n {
  background: #ffe066;
}

.learn-dot--struck {
  background: #dfe6e9;
  opacity: 0.5;
  position: relative;
}

.learn-dot--struck::after {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(
    to bottom left,
    transparent calc(50% - 2px),
    #e17055 calc(50% - 2px),
    #e17055 calc(50% + 2px),
    transparent calc(50% + 2px)
  );
  border-radius: 50%;
}

.learn-demo-grid {
  display: grid;
  gap: 0.3rem;
  width: fit-content;
  margin: 0.5rem auto 0;
}

.learn-demo-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 0.5rem;
}

.learn-demo-group {
  border: 3px solid var(--ink);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.45rem;
  background: var(--white);
}

.learn-demo-caption {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--ink-soft);
  margin-top: 0.65rem;
}

.learn-dialog-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 3px dashed rgba(45, 52, 54, 0.15);
}

.btn-learn-nav {
  font-family: inherit;
  font-weight: 800;
  font-size: 0.95rem;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 4px 0 var(--ink);
}

.btn-learn-nav:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn-learn-nav:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--ink);
}

.btn-learn-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

#btn-learn-prev {
  justify-self: start;
}

#btn-learn-next {
  justify-self: end;
}

.learn-progress {
  display: flex;
  gap: 0.35rem;
  justify-content: center;
}

.learn-progress-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #b2bec3;
  border: 2px solid var(--ink);
}

.learn-progress-dot.is-active {
  background: var(--rainbow-conic);
  transform: scale(1.15);
}

.play-card {
  margin-top: 0;
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  border: 4px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  box-shadow:
    0 8px 0 var(--ink),
    0 16px 40px var(--shadow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

.btn-race {
  font-family: "Fredoka", inherit;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  cursor: pointer;
  background: var(--play-toolbar-rainbow);
  background-size: 140% 100%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.85),
    0 0 1px rgba(255, 255, 255, 0.6);
  box-shadow: 0 4px 0 var(--ink);
  transition: transform 0.1s ease, box-shadow 0.1s ease, filter 0.1s ease;
}

.btn-race:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--ink);
  filter: brightness(1.05) saturate(1.05);
}

.btn-race:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--ink);
}

.race-dialog {
  box-sizing: border-box;
  max-width: min(94vw, calc(100vw - env(safe-area-inset-left) - env(safe-area-inset-right)));
  width: min(26rem, calc(100vw - env(safe-area-inset-left) - env(safe-area-inset-right) - 1rem));
  max-height: 92dvh;
  padding: 0;
  margin: auto;
  border: none;
  border-radius: var(--radius-lg);
  background: transparent;
}

.race-dialog::backdrop {
  background: rgba(45, 52, 54, 0.5);
}

.race-dialog-inner {
  position: relative;
  padding: 2.5rem 1.25rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 4px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  box-shadow: 0 8px 0 var(--ink);
  max-height: min(88dvh, calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 1.5rem));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.race-dialog-close {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  font-size: 1.35rem;
  font-weight: 700;
  border: 3px solid var(--ink-soft);
  border-radius: 50%;
  background: var(--white);
  color: var(--ink-soft);
  cursor: pointer;
}

.race-dialog-close:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.race-dialog-title {
  font-family: "Fredoka", sans-serif;
  font-size: 1.35rem;
  margin: 0 2.25rem 0.75rem 0;
  text-align: center;
  color: var(--ink);
}

.race-intro {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-soft);
}

.race-setup-actions,
.race-result-actions,
.race-play-actions {
  display: flex;
  justify-content: center;
  margin-top: 0.75rem;
}

.btn-race-start,
.btn-race-check {
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  cursor: pointer;
  background: linear-gradient(180deg, var(--grass), var(--grass-dark));
  color: var(--white);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
  box-shadow: 0 5px 0 var(--ink);
}

.btn-race-check {
  background: linear-gradient(180deg, #9ee5ff, #7ec4e8);
  color: var(--ink);
  text-shadow: none;
}

.btn-race-start:hover,
.btn-race-check:hover {
  transform: translateY(-2px);
}

.btn-race-start:active,
.btn-race-check:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 var(--ink);
}

.race-countdown {
  text-align: center;
  font-family: "Fredoka", sans-serif;
  font-size: clamp(2.5rem, 10vw, 4rem);
  font-weight: 700;
  color: #e17055;
  min-height: 3.5rem;
  margin-bottom: 0.5rem;
}

.race-hud {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.race-who {
  font-weight: 800;
  font-size: 1rem;
  color: var(--ink);
}

.race-timer {
  font-family: "Fredoka", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #d63031;
}

.race-scores {
  text-align: center;
  font-weight: 800;
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
  color: var(--ink-soft);
}

.race-question {
  font-family: "Fredoka", sans-serif;
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 700;
  text-align: center;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.race-answer {
  display: block;
  width: min(100%, 200px);
  margin: 0 auto 0.5rem;
  font-family: "Fredoka", sans-serif;
  font-size: 1.65rem;
  font-weight: 700;
  text-align: center;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  outline: none;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 252, 250, 0.8)) padding-box,
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, padding-box, border-box;
  box-shadow: inset 0 2px 0 rgba(0, 0, 0, 0.05);
}

.race-feedback {
  min-height: 1.75rem;
  text-align: center;
  font-weight: 800;
  font-size: 0.95rem;
  margin-top: 0.35rem;
}

.race-feedback.ok {
  color: var(--grass-dark);
}

.race-feedback.no {
  color: #e17055;
}

.race-result-title {
  font-family: "Fredoka", sans-serif;
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  text-align: center;
  color: var(--ink);
}

.race-result-detail {
  margin: 0;
  text-align: center;
  font-weight: 700;
  color: var(--ink-soft);
}

.play-title {
  font-family: "Fredoka", sans-serif;
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
  text-align: center;
}

.question-label {
  text-align: center;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.question-big {
  font-family: "Fredoka", sans-serif;
  font-size: clamp(2rem, 8vw, 3rem);
  text-align: center;
  margin: 0.75rem 0 1.25rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

/* Varied question formats (emoji groups, grids, phrases) */
.question-big .q-line,
.race-question .q-line {
  display: block;
}

.question-big .q-num,
.race-question .q-num {
  font-weight: 800;
}

.question-big .q-emoji-group,
.race-question .q-emoji-group {
  display: inline;
  font-size: clamp(0.82rem, 3vw, 1.2rem);
  letter-spacing: 0.02em;
  word-break: break-all;
}

.question-big .q-visual,
.race-question .q-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  width: 100%;
  font-size: clamp(1.15rem, 4.5vw, 2rem);
}

.question-big .q-visual--add,
.race-question .q-visual--add {
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  align-content: center;
  gap: 0.2rem 0.35rem;
}

.question-big .q-visual--add .q-eq,
.race-question .q-visual--add .q-eq {
  flex: 0 0 auto;
  margin-left: 0.15rem;
  font-weight: 800;
}

.question-big .q-visual--add-mix .q-line,
.race-question .q-visual--add-mix .q-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.2rem 0.35rem;
  font-size: clamp(1.2rem, 5vw, 2.2rem);
}

.question-big .q-op,
.race-question .q-op {
  font-weight: 800;
  margin: 0 0.1rem;
}

.question-big .q-eq,
.race-question .q-eq {
  font-weight: 800;
}

.question-big .q-visual--sub,
.race-question .q-visual--sub {
  gap: 0.55rem;
}

.question-big .q-sub-block,
.race-question .q-sub-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  max-width: 100%;
}

.question-big .q-mini-label,
.race-question .q-mini-label {
  font-family: "Nunito", "Fredoka", sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.question-big .q-mini-label--bottom,
.race-question .q-mini-label--bottom {
  margin-top: 0.15rem;
  text-transform: none;
  letter-spacing: normal;
  font-size: clamp(0.95rem, 3.5vw, 1.25rem);
}

.question-big .q-mul-caption,
.race-question .q-mul-caption {
  font-size: clamp(0.8rem, 2.8vw, 1rem);
  font-weight: 800;
  color: var(--ink-soft);
}

.question-big .q-mul-rows,
.race-question .q-mul-rows {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.12rem;
}

.question-big .q-mul-row,
.race-question .q-mul-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.05rem 0.08rem;
  font-size: clamp(0.7rem, 2.6vw, 1.05rem);
  line-height: 1.2;
}

.question-big .q-line--repeat,
.race-question .q-line--repeat {
  font-size: clamp(0.95rem, 3.8vw, 1.65rem);
  line-height: 1.35;
  word-break: break-word;
}

.question-big .q-visual--repeat-add,
.race-question .q-visual--repeat-add {
  gap: 0.35rem;
}

.question-big .q-visual--one-group,
.race-question .q-visual--one-group {
  gap: 0.35rem;
}

.question-big .q-phrase,
.race-question .q-phrase {
  display: block;
  font-size: clamp(1.05rem, 4vw, 1.85rem);
  line-height: 1.35;
  max-width: 22rem;
  margin: 0 auto;
  font-weight: 700;
}

.question-big .q-line--missing .q-missing,
.race-question .q-line--missing .q-missing {
  color: var(--sky-deep);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-style: wavy;
  text-underline-offset: 0.12em;
}

.race-question .q-visual,
.race-question .q-phrase,
.race-question .q-line--repeat {
  font-size: clamp(1rem, 3.8vw, 1.55rem);
}

.race-question .q-emoji-group {
  font-size: clamp(0.72rem, 2.8vw, 1.05rem);
}

.answer-row {
  display: flex;
  justify-content: center;
}

.answer-input {
  width: min(100%, 200px);
  font-family: "Fredoka", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  border: 4px solid transparent;
  outline: none;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 253, 250, 0.75)) padding-box,
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, padding-box, border-box;
  box-shadow: inset 0 3px 0 rgba(0, 0, 0, 0.06);
}

.answer-input:focus {
  box-shadow:
    0 0 0 3px rgba(255, 180, 200, 0.45),
    0 0 0 6px rgba(255, 230, 160, 0.35),
    0 0 0 9px rgba(160, 230, 200, 0.3),
    0 0 0 12px rgba(160, 200, 255, 0.25),
    inset 0 3px 0 rgba(0, 0, 0, 0.06);
}

.feedback {
  min-height: 2.5rem;
  margin: 1rem 0 0.5rem;
  text-align: center;
  font-size: 1.1rem;
  font-weight: 800;
}

.feedback.ok {
  color: var(--grass-dark);
}

.feedback.no {
  color: #e17055;
}

.play-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 0.5rem;
}

.btn-primary,
.btn-secondary,
.btn-help {
  font-family: inherit;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 0.75rem 1.35rem;
  border-radius: 999px;
  border: 3px solid var(--ink);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn-primary {
  background: var(--play-toolbar-rainbow);
  background-size: 155% 100%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 1px rgba(255, 255, 255, 0.45);
  box-shadow: 0 5px 0 var(--ink);
}

.btn-secondary {
  background: var(--play-toolbar-rainbow);
  background-size: 155% 100%;
  background-position: 100% 50%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 1px rgba(255, 255, 255, 0.45);
  box-shadow: 0 5px 0 var(--ink);
}

.btn-help {
  background: var(--play-toolbar-rainbow);
  background-size: 155% 100%;
  background-position: 40% 50%;
  color: var(--ink);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 1px rgba(255, 255, 255, 0.45);
  box-shadow: 0 5px 0 var(--ink);
}

.btn-primary:hover,
.btn-secondary:hover,
.btn-help:hover {
  transform: translateY(-2px);
}

.btn-primary:active,
.btn-secondary:active,
.btn-help:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 var(--ink);
}

.help-panel {
  margin-top: 1.25rem;
  padding: 1.1rem 1rem;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  background:
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, border-box;
  text-align: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45);
}

.help-panel-intro {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.help-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  margin: 0.5rem 0 0.75rem;
}

.help-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  max-width: 100%;
}

.help-row-label {
  width: 100%;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--ink-soft);
  margin-bottom: 0.15rem;
}

.help-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  justify-content: center;
  max-width: 100%;
}

.help-dot {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  border: 2px solid var(--ink);
  flex-shrink: 0;
}

.help-dot--a {
  background: #ff8fb8;
}

.help-dot--b {
  background: #7ec4e8;
}

.help-dot--neutral {
  background: #ffe066;
}

.help-dot--struck {
  background: #dfe6e9;
  opacity: 0.45;
  position: relative;
}

.help-dot--struck::after {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(
    to bottom left,
    transparent calc(50% - 2px),
    #e17055 calc(50% - 2px),
    #e17055 calc(50% + 2px),
    transparent calc(50% + 2px)
  );
  border-radius: 50%;
  pointer-events: none;
}

.help-grid-wrap {
  width: 100%;
  overflow-x: auto;
  padding: 0.25rem 0;
}

.help-grid {
  display: grid;
  gap: 0.25rem;
  margin: 0 auto;
  width: fit-content;
}

.help-grid .help-dot {
  width: 0.7rem;
  height: 0.7rem;
}

.help-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.help-group {
  border: 3px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.4rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 252, 248, 0.88)) padding-box,
    var(--question-rainbow-fill) padding-box,
    var(--question-rainbow-frame) border-box;
  background-clip: padding-box, padding-box, border-box;
}

.help-group .help-dots {
  gap: 0.2rem;
}

.help-panel-hint {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.btn-help-close {
  font-family: inherit;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  border: 2px solid var(--ink-soft);
  background: var(--white);
  color: var(--ink-soft);
  cursor: pointer;
}

.btn-help-close:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.score-line {
  text-align: center;
  margin: 1.25rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.score-line strong {
  color: var(--ink);
}

.site-footer {
  text-align: center;
  padding: 1rem max(1rem, env(safe-area-inset-right)) max(1.25rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
  color: var(--ink-soft);
}

/* Full-screen overlay for canvas-confetti (Magic UI uses this library + a canvas) */
.confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Phones & small tablets: safe layout, big taps, scrollable modals */
@media (max-width: 640px) {
  body {
    background-attachment: scroll;
  }

  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .category-card {
    padding: 1.15rem 0.65rem;
    min-height: 7.5rem;
  }

  .play-card {
    padding: 1.35rem 1rem 1.5rem;
  }

  .play-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }

  .play-actions .btn-primary,
  .play-actions .btn-secondary,
  .play-actions .btn-help {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 3rem;
  }

  .answer-input {
    width: 100%;
    max-width: none;
    font-size: max(1.125rem, 16px);
  }

  .btn-back,
  .btn-race,
  .btn-learn {
    min-height: 2.75rem;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
  }

  .learn-dialog-nav {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }

  #btn-learn-prev,
  #btn-learn-next {
    width: 100%;
    min-height: 2.75rem;
  }

  .btn-race-start,
  .btn-race-check {
    width: 100%;
    min-height: 2.85rem;
  }

  .race-setup-actions,
  .race-play-actions,
  .race-result-actions {
    width: 100%;
  }

  .race-answer {
    width: 100%;
    max-width: none;
    font-size: max(1.125rem, 16px);
  }

  .question-big {
    padding: 0.85rem 0.65rem;
  }
}

button,
.category-card,
.btn-back,
.btn-race,
.btn-learn,
.btn-primary,
.btn-secondary,
.btn-help,
.btn-race-start,
.btn-race-check,
.btn-learn-nav,
.btn-learn-sound,
.race-dialog-close,
.learn-dialog-close,
.btn-help-close {
  touch-action: manipulation;
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
    background-position: 50% 50%;
  }

  .logo-meteor .meteor-streak,
  .logo-meteor .meteor-streak::before,
  .category-card {
    animation: none;
  }

  .logo-meteor .meteor-streak {
    width: 2.75rem;
    opacity: 0.9;
    transform: rotate(-36deg) translate(0.35rem, 0.25rem);
  }

  .logo-meteor .meteor-streak::before {
    opacity: 1;
  }

  .category-card:hover {
    transform: none;
  }
}