/* Gamification: streak + level/XP widget, XP toasts, celebration overlays.
   The widget lives in the study top-nav (compact, always visible). */

.stats-widget {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  /* Sit on the left of the right-aligned nav actions for prominence. */
  margin-right: auto;
}

.stats-widget__main {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-1) var(--space-3);
  border: var(--border-width-soft) solid var(--color-border-card);
  border-radius: var(--radius-pill);
  background: var(--color-surface-card);
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-base);
}

.stats-widget__main:hover {
  border-color: var(--color-border-card-hover);
  transform: translateY(-1px);
}

/* --- Streak --- */
.stats-widget__streak {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-unit) * 1.25);
}

.stats-widget__flame {
  font-size: 16px;
  line-height: 1;
  filter: grayscale(1) opacity(0.45);
  transition: filter var(--transition-base), transform var(--transition-fast);
}

.stats-widget__flame.is-lit {
  filter: drop-shadow(0 0 4px var(--color-flame-glow));
}

.stats-widget__streak-num {
  font-size: 13px;
  font-weight: 900;
  color: var(--color-text-strong);
}

.stats-widget__streak.is-dim .stats-widget__streak-num {
  color: var(--color-text-faint);
}

/* --- Level + XP bar --- */
.stats-widget__level {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-left: var(--space-3);
  border-left: var(--border-width-soft) solid var(--color-border-card);
}

.stats-widget__badge {
  display: inline-flex;
  align-items: center;
  padding: calc(var(--space-unit) * 0.5) var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-tier-slate);
  color: #fff;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

.stats-widget__badge[data-tier="bronze"] { background: var(--color-tier-bronze); }
.stats-widget__badge[data-tier="silver"] { background: var(--color-tier-silver); }
.stats-widget__badge[data-tier="gold"] { background: var(--color-tier-gold); }
.stats-widget__badge[data-tier="amethyst"] { background: var(--color-tier-amethyst); }

.stats-widget__bar {
  position: relative;
  width: calc(var(--space-unit) * 16);
  height: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-050);
  overflow: hidden;
}

.stats-widget__bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-flame), var(--color-xp-bar));
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Detail popover --- */
.stats-widget__popover {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  z-index: 20;
  min-width: calc(var(--space-unit) * 52);
  padding: var(--space-3) var(--space-4);
  border: var(--border-width-soft) solid var(--color-border-card);
  border-radius: var(--radius-lg);
  background: var(--color-surface-card);
  box-shadow: 0 12px 28px rgba(30, 10, 60, 0.16);
}

.stats-widget__popover-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  padding: calc(var(--space-unit) * 1.25) 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.stats-widget__popover-row strong {
  font-size: 13px;
  font-weight: 900;
  color: var(--color-text-strong);
}

.stats-widget__popover-row + .stats-widget__popover-row {
  border-top: var(--border-width-soft) solid var(--color-border-soft);
}

/* --- Floating "+XP" toast --- */
.xp-toast-host {
  position: fixed;
  top: calc(72px + var(--space-3));
  right: var(--space-6);
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  pointer-events: none;
}

.xp-toast {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--color-text-strong);
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 8px 20px rgba(30, 10, 60, 0.22);
  animation: xp-toast-rise 2.2s ease forwards;
}

.xp-toast__amount {
  color: var(--color-flame-glow);
}

@keyframes xp-toast-rise {
  0% { opacity: 0; transform: translateY(10px) scale(0.92); }
  12% { opacity: 1; transform: translateY(0) scale(1); }
  78% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-12px) scale(0.98); }
}

/* --- Celebration overlay (level-up + streak milestone) --- */
.celebration-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: rgba(30, 10, 60, 0.45);
  animation: celebration-fade 0.25s ease forwards;
}

.celebration-card {
  position: relative;
  max-width: calc(var(--space-unit) * 88);
  width: 100%;
  padding: var(--space-8) var(--space-6) var(--space-6);
  border-radius: var(--radius-3xl);
  background: var(--color-surface-card);
  text-align: center;
  box-shadow: 0 24px 60px rgba(30, 10, 60, 0.3);
  animation: celebration-pop 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.celebration-card__emoji {
  font-size: 48px;
  line-height: 1;
}

.celebration-card__title {
  margin-top: var(--space-3);
  font-size: 22px;
  font-weight: 900;
  color: var(--color-text-strong);
}

.celebration-card__sub {
  margin-top: var(--space-2);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.celebration-card__xp {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--color-primary-050);
  color: var(--color-primary-700);
  font-size: 13px;
  font-weight: 900;
}

.celebration-card__dismiss {
  margin-top: var(--space-5);
  width: 100%;
  border-radius: var(--radius-2xl);
  padding: calc(var(--space-unit) * 3);
  font-size: 14px;
  font-weight: 900;
}

/* Confetti rains from the top of the overlay. */
.celebration-confetti {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.confetti-piece {
  position: absolute;
  top: -16px;
  width: 9px;
  height: 14px;
  border-radius: 2px;
  opacity: 0;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  0% { opacity: 1; transform: translateY(-10vh) rotate(0deg); }
  100% { opacity: 0.9; transform: translateY(105vh) rotate(540deg); }
}

@keyframes celebration-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes celebration-pop {
  0% { opacity: 0; transform: scale(0.85); }
  100% { opacity: 1; transform: scale(1); }
}

/* Respect users who prefer reduced motion: no rising, no confetti, no pop. */
@media (prefers-reduced-motion: reduce) {
  .xp-toast { animation: xp-toast-static 2.2s ease forwards; }
  .celebration-confetti { display: none; }
  .celebration-card { animation: celebration-fade 0.25s ease forwards; }
  .stats-widget__bar-fill { transition: none; }

  @keyframes xp-toast-static {
    0% { opacity: 0; }
    12% { opacity: 1; }
    82% { opacity: 1; }
    100% { opacity: 0; }
  }
}