/* ── Boss Fight Screen ── */

.boss-screen {
  min-height: 100vh;
  margin: calc(-1 * var(--space-lg));
  padding: 0;
}

.boss-arena {
  min-height: 100vh;
  background-color: #1a1a2e;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

.boss-arena::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,20,0.5) 0%, rgba(10,10,20,0.3) 40%, rgba(10,10,20,0.6) 100%);
  pointer-events: none;
  z-index: 0;
}

.boss-arena > * {
  position: relative;
  z-index: 1;
}

/* Boss (top section) */
.boss-top {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-direction: row-reverse;
}

.boss-info {
  flex: 1;
}

.boss-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: #FFF;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.boss-character {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.boss-svg {
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.4));
}

/* Player (bottom section) */
.boss-bottom {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.player-info {
  flex: 1;
}

.player-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: #FFF;
}

.player-character {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.player-svg {
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.4));
}

/* HP Bars */
.hp-bar {
  height: 16px;
  background: rgba(255,255,255,0.15);
  border-radius: 8px;
  overflow: hidden;
  margin: 4px 0;
  border: 1px solid rgba(255,255,255,0.1);
}

.hp-bar__fill {
  height: 100%;
  border-radius: 8px;
  transition: width 0.5s ease;
  position: relative;
}

.hp-bar__fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: rgba(255,255,255,0.2);
  border-radius: 8px 8px 0 0;
}

.hp-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.7);
}

/* Battle area (center) */
.boss-battle-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.boss-problem-card {
  background: rgba(255,255,255,0.95);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  max-width: 500px;
  width: 100%;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.boss-problem-question {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.boss-submit-area {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

/* Timer */
.boss-timer-container {
  position: relative;
  width: 60px;
  height: 60px;
}

.boss-timer-ring {
  transform: rotate(-90deg);
}

.boss-timer-bg {
  fill: none;
  stroke: rgba(255,255,255,0.15);
  stroke-width: 4;
}

.boss-timer-fill {
  fill: none;
  stroke: #22C55E;
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.1s linear, stroke 0.3s ease;
}

.boss-timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #FFF;
}

/* Hit flash animation */
.boss-hit-flash {
  animation: hitFlash 0.5s ease;
}

@keyframes hitFlash {
  0% { transform: translateX(0); filter: brightness(1); }
  10% { transform: translateX(-8px); filter: brightness(2); }
  20% { transform: translateX(8px); filter: brightness(1.5); }
  30% { transform: translateX(-4px); filter: brightness(1.2); }
  40% { transform: translateX(4px); }
  100% { transform: translateX(0); filter: brightness(1); }
}

/* ── Boss Card on Topic Screen ── */

.boss-fight-section {
  margin-top: var(--space-xl);
}

.boss-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.boss-card--ready {
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  border: 2px solid #F59E0B;
  cursor: pointer;
}

.boss-card--ready:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.boss-card--defeated {
  background: linear-gradient(135deg, #DCFCE7, #BBF7D0);
  border: 2px solid #22C55E;
  cursor: pointer;
}

.boss-card--locked {
  background: var(--bg-card);
  border: 2px dashed #D1D5DB;
  opacity: 0.6;
}

.boss-card__icon {
  font-size: var(--text-3xl);
}

.boss-card__info {
  flex: 1;
}

.boss-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
}

.boss-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.boss-card__arrow {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: #92400E;
}

/* ── Boss Badge on Topic Card ── */
.boss-badge {
  position: absolute;
  top: -6px;
  left: -6px;
  font-size: 22px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
  z-index: 1;
}

/* ── Character Card (Home Screen) ── */

.character-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-lg);
}

.character-card:hover {
  transform: translateY(-2px);
}

.character-card__avatar {
  flex-shrink: 0;
}

.character-card__info {
  flex: 1;
  min-width: 0;
}

.character-card__level {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: #FFF;
  margin-bottom: 2px;
}

.character-card__stats {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-sm);
}

/* XP Bar */
.xp-bar {
  height: 10px;
  background: rgba(255,255,255,0.15);
  border-radius: 5px;
  overflow: hidden;
}

.xp-bar--large {
  height: 14px;
  border-radius: 7px;
}

.xp-bar__fill {
  height: 100%;
  border-radius: 5px;
  background: linear-gradient(90deg, #F59E0B, #FBBF24);
  transition: width var(--transition-slow);
}

.xp-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.6);
  margin-top: 2px;
}

/* XP Reward toast */
.xp-reward {
  display: inline-block;
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  border: 2px solid #F59E0B;
  border-radius: var(--radius-lg);
  padding: var(--space-sm) var(--space-xl);
  margin-bottom: var(--space-lg);
}

.xp-amount {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: #92400E;
}

/* Level up banner */
.level-up-banner {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: #FFF;
  background: linear-gradient(135deg, #4A90D9, #8B5CF6);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  display: inline-block;
}

/* Achievement unlock toast */
.achievement-unlock {
  margin-bottom: var(--space-lg);
}

.achievement-badge {
  display: inline-block;
  background: var(--bg-card);
  border: 2px solid #F59E0B;
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-heading);
  font-weight: 700;
  margin: var(--space-xs);
}

/* ── Character Screen ── */

.char-display {
  text-align: center;
  padding: var(--space-lg) 0;
}

.char-avatar {
  margin: 0 auto var(--space-lg);
}

.char-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  background: linear-gradient(135deg, #F59E0B, #D97706);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.char-level {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.char-xp-section {
  max-width: 400px;
  margin: 0 auto var(--space-xl);
}

.char-xp-section .xp-bar {
  background: #E5E7EB;
}

.char-xp-section .xp-label {
  color: var(--text-secondary);
}

.char-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  min-width: 100px;
  text-align: center;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--text-primary);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

.char-section {
  margin-bottom: var(--space-xl);
}

.char-section-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

/* Trophy grid */
.trophy-grid {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.trophy-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
  min-width: 100px;
  opacity: 0.4;
}

.trophy-item--earned {
  opacity: 1;
  border: 2px solid #22C55E;
}

.trophy-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-xs);
}

.trophy-name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
}

/* Achievement grid */
.achievement-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.achievement-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  opacity: 0.4;
}

.achievement-item--earned {
  opacity: 1;
  border-left: 4px solid #F59E0B;
}

.achievement-icon {
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.achievement-info {
  flex: 1;
}

.achievement-name {
  font-family: var(--font-heading);
  font-weight: 700;
}

.achievement-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ── Topic Grid: 3 columns for 9 topics ── */
@media (min-width: 641px) {
  .topic-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ── Responsive boss fight ── */
@media (max-width: 640px) {
  .boss-arena {
    padding: var(--space-sm);
  }

  .boss-problem-card {
    padding: var(--space-md);
  }

  .boss-problem-question {
    font-size: var(--text-lg);
  }

  .character-card__stats {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  .char-stats {
    flex-wrap: wrap;
  }
}