:root {
  --bg-a: #13233f;
  --bg-b: #234e7a;
  --bg-c: #4ca17b;
  --surface: #eff8ffde;
  --ink: #0f1e2e;
  --accent: #ff6f3c;
  --accent-2: #ffe66d;
  --line: #ffffff52;
  --good: #1f9d61;
  --bad: #c2354b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Space Grotesk', 'Trebuchet MS', sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 15%, #5cbfd8 0%, transparent 38%),
    radial-gradient(circle at 85% 85%, #f7c164 0%, transparent 30%),
    linear-gradient(135deg, var(--bg-a) 0%, var(--bg-b) 48%, var(--bg-c) 100%);
}

.sky-gradient {
  position: fixed;
  inset: 0;
  background: linear-gradient(to top, #12203566 0%, #ffffff00 42%);
  pointer-events: none;
}

.game-shell {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 14px 30px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: #eef6ff;
  font-weight: 700;
}

h1 {
  margin: 4px 0 0;
  font-family: 'Bungee', 'Impact', sans-serif;
  color: #ffffff;
  line-height: 1;
  font-size: clamp(2rem, 8vw, 3rem);
  text-shadow: 0 6px 16px #0d182f66;
}

.hud {
  margin: 14px 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.hud-chip {
  background: #f2fbffdd;
  border: 1px solid #ffffff66;
  border-radius: 999px;
  padding: 9px 12px;
  text-align: center;
  font-weight: 500;
  backdrop-filter: blur(3px);
}

.canvas-wrap {
  border: 3px solid #ffffff5f;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 20px 45px #0f193170;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  background: linear-gradient(to bottom, #74d9f3 0%, #90e4ff 42%, #d9f6ff 100%);
}

.controls-card {
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  color: #12304c;
}

.controls-card p {
  margin: 0 0 6px;
}

.controls-card p:last-child {
  margin-bottom: 0;
}

kbd {
  font-family: inherit;
  border: 1px solid #b7cbe3;
  border-bottom-width: 3px;
  border-radius: 8px;
  padding: 1px 6px;
  background: #fff;
}

.action-btn,
.touch-btn {
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.action-btn {
  background: linear-gradient(135deg, var(--accent), #ff9867);
  color: #fff;
  padding: 10px 18px;
  box-shadow: 0 10px 20px #952f1250;
}

.action-btn:hover {
  transform: translateY(-1px);
}

.touch-controls {
  margin-top: 10px;
  display: none;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.touch-btn {
  background: #ffffffdd;
  color: #19314f;
  padding: 12px;
  font-size: 1.2rem;
}

.overlay {
  position: fixed;
  inset: 0;
  background: #091428b8;
  display: grid;
  place-items: center;
  padding: 12px;
  z-index: 40;
}

.overlay-card {
  width: min(560px, 100%);
  max-height: 90vh;
  overflow: auto;
  background: #fbfeffff;
  border-radius: 18px;
  border: 2px solid #b3cde6;
  padding: 18px;
}

.overlay-card h2 {
  margin: 0;
  font-family: 'Bungee', 'Impact', sans-serif;
  color: #163259;
  letter-spacing: 0.02em;
}

.quiz-word {
  font-size: 1.7rem;
  margin: 8px 0 6px;
  color: #1e5790;
  font-weight: 700;
}

.quiz-options {
  display: grid;
  gap: 8px;
}

.quiz-opt {
  text-align: left;
  border-radius: 12px;
  border: 1px solid #c5d9ee;
  background: #f3f8ff;
  color: #10294a;
  padding: 10px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}

.quiz-opt:hover {
  background: #e6f2ff;
}

.quiz-opt.correct {
  border-color: #45b874;
  background: #e7faef;
}

.quiz-opt.wrong {
  border-color: #cf4864;
  background: #ffeef2;
}

.quiz-feedback {
  min-height: 24px;
  margin: 10px 0;
  font-weight: 700;
}

.quiz-feedback.good {
  color: var(--good);
}

.quiz-feedback.bad {
  color: var(--bad);
}

.summary-list {
  margin: 8px 0 16px;
  padding-left: 18px;
  color: #123458;
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .touch-controls {
    display: grid;
  }
}