:root {
  --bg: #0d1f2d;
  --card: #142737;
  --accent: #43c1ff;
  --text: #f7f9fb;
  --muted: #a3b5c3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #1b3a5a 0%, #0d1f2d 45%, #08131e 100%);
  color: var(--text);
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.card {
  background: rgba(18, 36, 56, 0.96);
  border: 1px solid rgba(67, 193, 255, 0.2);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.25);
}

#grade-screen.girl-theme,
#quiz-screen.girl-theme,
#game-choice-screen.girl-theme,
#game-screen.girl-theme {
  background: rgba(213, 28, 105, 0.95);
  border-color: rgba(229, 17, 102, 0.45);
}

#grade-screen.boy-theme,
#quiz-screen.boy-theme,
#game-choice-screen.boy-theme,
#game-screen.boy-theme {
  background: rgba(18, 18, 18, 0.96);
  border-color: rgba(255, 85, 85, 0.55);
}

.preference-panel {
  display: grid;
  gap: 16px;
  margin-bottom: 20px;
}

.preference-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.preference-group span {
  min-width: 110px;
  font-weight: 600;
}

.preference-group label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.preference-group input {
  accent-color: var(--accent);
}

.hidden {
  display: none;
}

#game-screen.flash-warning {
  animation: screen-flash 0.75s ease-in-out infinite alternate;
}

@keyframes screen-flash {
  from {
    box-shadow: 0 0 0 rgba(255, 0, 0, 0);
    background-color: rgba(0, 0, 0, 0.0);
  }
  to {
    box-shadow: 0 0 45px rgba(255, 60, 60, 0.8);
    background-color: rgba(255, 55, 55, 0.08);
  }
}

#questions {
  display: grid;
  gap: 18px;
  margin: 16px 0;
}

.question-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.question-row label {
  flex: 1;
  margin-right: 12px;
}

.question-row input {
  width: 100px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 1rem;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 1rem;
  color: #0b1a27;
  background: linear-gradient(135deg, #43c1ff, #6efaff);
  transition: transform 0.2s ease, filter 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
}

.game-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.grade-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.feedback {
  margin-top: 16px;
  font-size: 0.95rem;
  min-height: 1.3em;
  color: #ffd369;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

#game-canvas {
  width: 100%;
  max-width: 100%;
  border-radius: 16px;
  background: #0b1625;
}

.instructions {
  margin-top: 12px;
  color: var(--muted);
}

@media (max-width: 600px) {
  .game-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Additional UI styles for admin/analytics */
.row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.form-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.meta {
  margin-top: 10px;
  color: var(--muted);
}
#register-panel label,
#analytics-panel label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.report {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}
.report th, .report td {
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,0.06);
  text-align: left;
  background: rgba(255,255,255,0.02);
  color: var(--text);
}
.report thead th {
  background: rgba(67,193,255,0.08);
}

.container footer { margin-top: 16px; text-align: center; color: var(--muted); }