/* Tvesha's Math — pink, blue, purple */

:root {
  --pink: #ff7eb9;
  --pink-light: #ffd6ea;
  --blue: #5eb5ff;
  --blue-deep: #3a8fd9;
  --purple: #a855f7;
  --purple-deep: #7c3aed;
  --white: #fffdf8;
  --text: #2d1b3d;
  --shadow: rgba(124, 58, 237, 0.25);
}

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

html {
  font-size: 18px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Fredoka", system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(
    135deg,
    var(--pink-light) 0%,
    #c4e4ff 45%,
    #e9d5ff 100%
  );
  background-attachment: fixed;
}

.bg-bubbles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-bubbles::before,
.bg-bubbles::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  opacity: 0.35;
}

.bg-bubbles::before {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, var(--pink) 0%, transparent 70%);
  top: -80px;
  right: -60px;
}

.bg-bubbles::after {
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, var(--blue) 0%, transparent 70%);
  bottom: -100px;
  left: -80px;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
}

.header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--purple-deep), var(--blue-deep), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text);
  opacity: 0.85;
}

.score-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  margin-bottom: 1.25rem;
}

@media (min-width: 480px) {
  .score-panel {
    grid-template-columns: repeat(4, 1fr);
  }
}

.score-card {
  background: var(--white);
  border-radius: 16px;
  padding: 0.65rem 0.75rem;
  text-align: center;
  box-shadow: 0 6px 20px var(--shadow);
  border: 3px solid transparent;
  background-image:
    linear-gradient(var(--white), var(--white)),
    linear-gradient(135deg, var(--pink), var(--blue), var(--purple));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

.score-card .label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.75;
}

.score-card .value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--purple-deep);
}

.problem-card {
  background: var(--white);
  border-radius: 24px;
  padding: 1.5rem 1.25rem;
  box-shadow: 0 12px 40px var(--shadow);
  border: 4px solid transparent;
  background-image:
    linear-gradient(var(--white), var(--white)),
    linear-gradient(145deg, var(--pink), var(--blue), var(--purple));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

.problem-work-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.problem-question {
  flex: 1 1 260px;
  min-width: 0;
}

.problem-text {
  font-size: 1.15rem;
  line-height: 1.55;
  margin: 0;
  min-height: 4.5rem;
}

.scratch-pad {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: min(100%, 400px);
  margin-left: auto;
}

@media (max-width: 639px) {
  .scratch-pad {
    width: 100%;
    margin-left: 0;
  }
}

.scratch-pad-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--purple-deep);
  text-align: center;
}

.scratch-canvas-wrap {
  flex: 1;
  min-height: 260px;
  border-radius: 14px;
  border: 3px dashed var(--blue);
  background: linear-gradient(180deg, #fffdf8 0%, #f5f0ff 100%);
  overflow: hidden;
  touch-action: none;
}

#scratch-canvas {
  display: block;
  width: 100%;
  height: 300px;
  cursor: crosshair;
  vertical-align: top;
}

.btn-scratch-clear {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.65rem;
  border-radius: 12px;
  border: 2px solid var(--pink);
  background: var(--white);
  color: var(--purple-deep);
  cursor: pointer;
  align-self: center;
  transition: transform 0.15s, background 0.15s;
}

.btn-scratch-clear:hover {
  background: var(--pink-light);
}

.btn-scratch-clear:active {
  transform: scale(0.98);
}

.hint-box,
.answer-box {
  border-radius: 14px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}

.hint-box {
  background: linear-gradient(135deg, #fff5fb, #e8f4ff);
  border: 2px dashed var(--blue);
}

.hint-box.hidden,
.answer-box.hidden {
  display: none;
}

.hint-label,
.answer-label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--purple-deep);
}

#hint-text,
#answer-text {
  margin: 0.35rem 0 0;
  font-size: 1rem;
}

.answer-box {
  background: linear-gradient(135deg, #f3e8ff, #ffe8f4);
  border: 2px solid var(--purple);
}

.answer-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.input-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

#answer-input {
  flex: 1;
  min-width: 140px;
  padding: 0.75rem 1rem;
  font-size: 1.1rem;
  font-family: inherit;
  border-radius: 14px;
  border: 3px solid var(--blue);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

#answer-input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.25);
}

.btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.1rem;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--purple), var(--purple-deep));
  color: white;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.45);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.5);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: white;
  box-shadow: 0 4px 14px rgba(58, 143, 217, 0.4);
}

.btn-outline {
  background: var(--white);
  color: var(--purple-deep);
  border: 3px solid var(--pink);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.feedback {
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
  font-weight: 600;
  font-size: 1rem;
}

.feedback.ok {
  color: #059669;
}

.feedback.bad {
  color: #dc2626;
}

.feedback.neutral {
  color: var(--purple-deep);
}

.footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.85rem;
  opacity: 0.8;
}

.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;
}

#answer-input:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}