/* ============================================
   단어단어 (WordWord) Design System
   Dark + Neon Purple/Cyan Glassmorphism
   ============================================ */

@font-face {
  font-family: 'SUITE';
  src: url('../fonts/SUITE-Variable.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-display: swap;
}

/* ── CSS Variables ── */
:root {
  --font: 'SUITE', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', monospace;

  /* Colors */
  --bg-deep: #0a0a1a;
  --bg-mid: #12122a;
  --bg-surface: rgba(255,255,255,0.04);

  --purple: #a855f7;
  --purple-glow: #c084fc;
  --cyan: #06b6d4;
  --cyan-glow: #22d3ee;
  --pink: #ec4899;
  --green: #22c55e;
  --red: #ef4444;
  --amber: #f59e0b;
  --white: #f1f5f9;
  --white-dim: #94a3b8;
  --white-muted: #64748b;

  /* Glassmorphism */
  --glass-bg: rgba(255,255,255,0.06);
  --glass-bg-hover: rgba(255,255,255,0.10);
  --glass-border: rgba(255,255,255,0.10);
  --glass-border-active: rgba(168,85,247,0.4);
  --glass-blur: blur(24px);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.3);

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout */
  --max-w: 680px;
  --pad: 20px;
  --hud-h: 56px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset ── */
*, *::before, *::after {
  margin: 0; padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-weight: 400;
  color: var(--white);
  background: var(--bg-deep);
  min-height: 100dvh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Mesh Gradient Background ── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 20%, rgba(168,85,247,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 80%, rgba(6,182,212,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 50% 50%, rgba(236,72,153,0.06) 0%, transparent 60%);
  animation: meshDrift 20s ease-in-out infinite alternate;
}

@keyframes meshDrift {
  0% { opacity: 0.8; }
  50% { opacity: 1; }
  100% { opacity: 0.8; }
}

/* ── Particle Canvas ── */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* ── App Container ── */
#app {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--pad);
  min-height: 100dvh;
}

/* ── Screens ── */
.screen {
  display: none;
  animation: fadeIn 0.3s var(--ease);
}
.screen.active {
  display: flex;
  flex-direction: column;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Glass Card ── */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
}

.glass-sm {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

/* ── HOME SCREEN ── */
.home-header {
  text-align: center;
  padding: 48px 0 32px;
}

.home-logo {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--purple-glow), var(--cyan-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
  line-height: 1.2;
}

.home-sub {
  color: var(--white-dim);
  font-size: 0.95rem;
  margin-top: 8px;
  font-weight: 300;
}

/* Player Stats Bar */
.player-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  margin-bottom: 24px;
}

.stat-level {
  display: flex;
  align-items: center;
  gap: 8px;
}

.level-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.stat-level-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--white-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.xp-bar-wrap {
  width: 100px;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
  border-radius: var(--radius-full);
  transition: width 0.6s var(--spring);
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--glass-border);
}

.stat-numbers {
  display: flex;
  gap: 20px;
  flex: 1;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
}

/* Model Grid */
.model-section-title {
  font-size: 0.8rem;
  color: var(--white-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  padding-left: 4px;
}

.model-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.model-card {
  padding: 20px 16px;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.model-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(168,85,247,0.08));
  opacity: 0;
  transition: opacity 0.25s var(--ease);
}

.model-card:hover {
  border-color: var(--glass-border-active);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(168,85,247,0.15);
}

.model-card:hover::before { opacity: 1; }

.model-card:active {
  transform: translateY(0) scale(0.98);
}

.model-key {
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 0.65rem;
  color: var(--white-muted);
  background: rgba(255,255,255,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.model-flag {
  font-size: 1.8rem;
  margin-bottom: 6px;
  display: block;
  position: relative;
  z-index: 1;
}

.model-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--white);
  position: relative;
  z-index: 1;
}

.model-desc {
  font-size: 0.72rem;
  color: var(--white-muted);
  margin-top: 4px;
  position: relative;
  z-index: 1;
}

/* Bottom nav */
.home-nav {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.nav-btn {
  flex: 1;
  padding: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--white-dim);
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  text-align: center;
}

.nav-btn:hover {
  background: var(--glass-bg-hover);
  color: var(--white);
  border-color: var(--glass-border-active);
}

/* ── HUD (Game Top Bar) ── */
.hud {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  margin: -20px -20px 20px;
  background: rgba(10,10,26,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
}

.hud-left, .hud-center, .hud-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-timer-ring {
  width: 40px;
  height: 40px;
  position: relative;
}

.hud-timer-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.hud-timer-ring .ring-bg {
  fill: none;
  stroke: rgba(255,255,255,0.08);
  stroke-width: 3;
}

.hud-timer-ring .ring-fill {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.3s linear, stroke 0.3s;
}

.hud-timer-ring .ring-fill.warning {
  stroke: var(--amber);
}

.hud-timer-ring .ring-fill.danger {
  stroke: var(--red);
  animation: timerPulse 0.5s ease-in-out infinite;
}

.hud-timer-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.hud-streak {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--amber);
}

.hud-streak .streak-fire {
  animation: streakFire 0.4s ease-in-out infinite alternate;
}

.hud-score {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--purple-glow), var(--cyan-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hud-combo {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--purple), var(--pink));
  font-weight: 700;
  animation: comboBounce 0.3s var(--spring);
}

.hud-progress {
  font-size: 0.72rem;
  color: var(--white-muted);
}

/* ── GAME AREA ── */
.game-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Question Card */
.question-card {
  padding: 32px 24px;
  text-align: center;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.question-type-badge {
  font-size: 0.68rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
}

.question-word {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  word-break: keep-all;
}

.question-hint {
  font-size: 0.82rem;
  color: var(--white-muted);
  font-weight: 300;
}

.question-sentence {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.6;
}

.question-sentence .blank {
  display: inline-block;
  min-width: 80px;
  border-bottom: 2px dashed var(--cyan);
  margin: 0 4px;
  color: var(--cyan);
}

/* Options Grid (2x2) */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.option-btn {
  padding: 16px 12px;
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s var(--ease);
  text-align: center;
  position: relative;
  word-break: keep-all;
  line-height: 1.4;
}

.option-btn .option-key {
  position: absolute;
  top: 6px;
  left: 8px;
  font-size: 0.6rem;
  color: var(--white-muted);
  font-weight: 700;
  background: rgba(255,255,255,0.06);
  width: 18px;
  height: 18px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-active);
  transform: scale(1.02);
}

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

.option-btn.correct {
  border-color: var(--green);
  background: rgba(34,197,94,0.15);
  animation: correctFlash 0.4s var(--ease);
}

.option-btn.wrong {
  border-color: var(--red);
  background: rgba(239,68,68,0.15);
  animation: wrongShake 0.4s var(--ease);
}

.option-btn.disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* O/X Buttons */
.ox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.ox-btn {
  padding: 28px;
  font-size: 2.5rem;
  font-weight: 900;
  cursor: pointer;
  border-radius: var(--radius-lg);
  transition: all 0.15s var(--ease);
  text-align: center;
  border: 2px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--white);
  font-family: var(--font);
}

.ox-btn.o-btn:hover {
  border-color: var(--green);
  background: rgba(34,197,94,0.1);
}

.ox-btn.x-btn:hover {
  border-color: var(--red);
  background: rgba(239,68,68,0.1);
}

.ox-btn.correct { border-color: var(--green); background: rgba(34,197,94,0.15); }
.ox-btn.wrong { border-color: var(--red); background: rgba(239,68,68,0.15); animation: wrongShake 0.4s; }

/* Text Input */
.input-area {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.text-input {
  width: 100%;
  padding: 16px 20px;
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: var(--font);
  font-size: 1.1rem;
  font-weight: 500;
  outline: none;
  transition: border-color 0.2s var(--ease);
  text-align: center;
}

.text-input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(168,85,247,0.15);
}

.text-input::placeholder {
  color: var(--white-muted);
  font-weight: 300;
}

.submit-btn {
  padding: 14px;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}

.submit-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.submit-btn:active {
  transform: translateY(1px);
}

/* Matching Pairs */
.match-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.match-column {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.match-item {
  padding: 14px 12px;
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s var(--ease);
  text-align: center;
  word-break: keep-all;
}

.match-item:hover {
  border-color: var(--glass-border-active);
  background: var(--glass-bg-hover);
}

.match-item.selected {
  border-color: var(--purple);
  background: rgba(168,85,247,0.15);
  box-shadow: 0 0 12px rgba(168,85,247,0.2);
}

.match-item.matched {
  border-color: var(--green);
  background: rgba(34,197,94,0.12);
  opacity: 0.6;
  pointer-events: none;
}

.match-item.wrong-match {
  animation: wrongShake 0.4s var(--ease);
}

/* Sentence Reorder */
.reorder-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 48px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  justify-content: center;
}

.word-chip {
  padding: 8px 14px;
  background: rgba(168,85,247,0.12);
  border: 1px solid rgba(168,85,247,0.25);
  border-radius: var(--radius-full);
  color: var(--white);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s var(--ease);
  user-select: none;
}

.word-chip:hover {
  background: rgba(168,85,247,0.25);
  transform: translateY(-2px);
}

.word-chip.placed {
  opacity: 0.3;
  pointer-events: none;
}

.answer-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 52px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 2px dashed var(--glass-border);
  justify-content: center;
  align-items: center;
}

.answer-slots .word-chip {
  background: rgba(6,182,212,0.15);
  border-color: rgba(6,182,212,0.3);
}

.answer-slots-placeholder {
  color: var(--white-muted);
  font-size: 0.82rem;
}

/* Feedback overlay */
.feedback {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 50;
  font-size: 4rem;
  font-weight: 900;
  pointer-events: none;
  opacity: 0;
}

.feedback.correct-fb {
  color: var(--green);
  animation: scoreFloat 0.8s var(--ease) forwards;
}

.feedback.wrong-fb {
  color: var(--red);
  animation: scoreFloat 0.6s var(--ease) forwards;
}

/* ── RESULT SCREEN ── */
.result-screen {
  align-items: center;
  padding-top: 40px;
  gap: 20px;
}

.result-rank {
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  animation: rankReveal 0.8s var(--spring);
}

.rank-S { background: linear-gradient(135deg, #fbbf24, #f59e0b, #fbbf24); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; text-shadow: none; filter: drop-shadow(0 0 24px rgba(245,158,11,0.5)); }
.rank-A { background: linear-gradient(135deg, var(--purple-glow), var(--pink)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.rank-B { background: linear-gradient(135deg, var(--cyan), var(--green)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.rank-C { color: var(--white-dim); }
.rank-D { color: var(--white-muted); }
.rank-F { color: var(--red); }

.result-score {
  font-size: 2.4rem;
  font-weight: 800;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
}

.result-stat-card {
  padding: 16px;
  text-align: center;
}

.result-stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 2px;
}

.result-stat-label {
  font-size: 0.72rem;
  color: var(--white-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.result-xp {
  width: 100%;
  padding: 16px 20px;
  text-align: center;
}

.xp-gain {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--amber);
}

.xp-progress {
  margin-top: 8px;
}

.xp-bar-full {
  width: 100%;
  height: 10px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 6px;
}

.xp-bar-full .xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
  border-radius: var(--radius-full);
  transition: width 1.5s var(--spring);
}

.result-actions {
  display: flex;
  gap: 10px;
  width: 100%;
}

.result-btn {
  flex: 1;
  padding: 14px;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  text-align: center;
  border: none;
}

.result-btn-primary {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: white;
}

.result-btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--white-dim);
}

.result-btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

/* ── ACHIEVEMENTS / STATS SCREENS ── */
.screen-title {
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  margin: 16px 0;
  background: linear-gradient(135deg, var(--purple-glow), var(--cyan-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.achievement-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.achievement-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
}

.achievement-icon {
  font-size: 1.8rem;
  width: 44px;
  text-align: center;
  flex-shrink: 0;
}

.achievement-info {
  flex: 1;
}

.achievement-name {
  font-weight: 700;
  font-size: 0.92rem;
}

.achievement-desc {
  font-size: 0.78rem;
  color: var(--white-muted);
  margin-top: 2px;
}

.achievement-item.locked {
  opacity: 0.4;
  filter: grayscale(0.6);
}

.achievement-item.locked .achievement-icon {
  filter: grayscale(1);
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stat-card {
  padding: 16px;
  text-align: center;
}

.stat-card-value {
  font-size: 1.8rem;
  font-weight: 800;
}

.stat-card-label {
  font-size: 0.72rem;
  color: var(--white-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 2px;
}

/* Back button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--white-dim);
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 12px;
}

.back-btn:hover {
  background: var(--glass-bg-hover);
  color: var(--white);
}

/* ── Level Up Overlay ── */
.levelup-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s var(--ease);
}

.levelup-content {
  text-align: center;
  animation: levelUp 0.6s var(--spring);
}

.levelup-label {
  font-size: 1rem;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 4px;
  font-weight: 600;
}

.levelup-number {
  font-size: 5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--amber), var(--pink), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.levelup-unlock {
  font-size: 0.9rem;
  color: var(--cyan-glow);
  margin-top: 8px;
}

/* ── ANIMATIONS ── */
@keyframes correctFlash {
  0% { box-shadow: 0 0 0 0 rgba(34,197,94,0.4); }
  50% { box-shadow: 0 0 20px 4px rgba(34,197,94,0.3); }
  100% { box-shadow: none; }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes comboBounce {
  0% { transform: scale(0.5); opacity: 0; }
  60% { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes scoreFloat {
  0% { opacity: 1; transform: translate(-50%, -50%) scale(0.5); }
  50% { opacity: 1; transform: translate(-50%, -70%) scale(1.2); }
  100% { opacity: 0; transform: translate(-50%, -120%) scale(0.8); }
}

@keyframes timerPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes streakFire {
  0% { transform: scale(1); }
  100% { transform: scale(1.2); }
}

@keyframes levelUp {
  0% { transform: scale(0.3) rotate(-10deg); opacity: 0; }
  60% { transform: scale(1.1) rotate(2deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes rankReveal {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes particleBurst {
  0% { transform: translate(0,0) scale(1); opacity: 1; }
  100% { opacity: 0; }
}

/* ── Toast Notifications ── */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-md);
  background: rgba(20,20,40,0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 500;
  animation: toastIn 0.3s var(--spring), toastOut 0.3s var(--ease) 2.7s forwards;
  max-width: 300px;
}

.toast-achievement {
  border-color: var(--amber);
}

@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toastOut {
  from { opacity: 1; }
  to { opacity: 0; transform: translateY(-10px); }
}

/* ── Listen Question ── */
.listen-btn {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  display: flex;
  align-items: center;
  justify-content: center;
}

.listen-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 32px rgba(168,85,247,0.4);
}

.listen-btn:active {
  transform: scale(0.95);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 3px;
}

/* ── Selection ── */
::selection {
  background: rgba(168,85,247,0.3);
  color: var(--white);
}

/* ── Responsive ── */
@media (max-width: 480px) {
  :root {
    --pad: 14px;
  }

  .home-logo { font-size: 2.2rem; }

  .question-word { font-size: 1.7rem; }

  .model-grid { gap: 8px; }
  .model-card { padding: 14px 10px; }
  .model-flag { font-size: 1.4rem; }
  .model-label { font-size: 0.78rem; }

  .option-btn { padding: 12px 8px; font-size: 0.9rem; }
  .ox-btn { padding: 20px; font-size: 2rem; }

  .hud { padding: 8px 12px; margin: -14px -14px 16px; }
  .hud-score { font-size: 0.95rem; }

  .player-stats { flex-wrap: wrap; gap: 10px; padding: 12px 14px; }
  .stat-numbers { gap: 12px; }

  .result-rank { font-size: 4.5rem; }
  .result-score { font-size: 1.8rem; }
  .result-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .result-stat-card { padding: 10px; }
  .result-stat-value { font-size: 1.2rem; }

  .match-item { padding: 10px 8px; font-size: 0.82rem; }
  .word-chip { padding: 6px 10px; font-size: 0.82rem; }

  .toast-container { right: 10px; left: 10px; }
  .toast { max-width: 100%; }
}

@media (max-width: 360px) {
  .options-grid { grid-template-columns: 1fr; }
  .result-stats { grid-template-columns: 1fr 1fr; }
}

/* ── Settings ── */
.settings-group {
  padding: 16px;
  margin-bottom: 12px;
}

.settings-label {
  font-size: 0.8rem;
  color: var(--white-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}

.settings-row-label {
  font-size: 0.9rem;
  font-weight: 500;
}

/* Toggle Switch */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  cursor: pointer;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.12);
  border-radius: var(--radius-full);
  transition: background 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.3s var(--spring);
}

.toggle input:checked + .toggle-slider {
  background: var(--purple);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* Reset button */
.danger-btn {
  width: 100%;
  padding: 12px;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-md);
  color: var(--red);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 12px;
}

.danger-btn:hover {
  background: rgba(239,68,68,0.2);
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 24px 0 8px;
  font-size: 0.72rem;
  color: var(--white-muted);
}