/* =========================
   FONTS & RESET
========================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

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

/* =========================
   CSS VARIABLES
========================= */

:root {
  --bg-primary: #f0f2f5;
  --bg-secondary: rgba(255, 255, 255, 0.55);
  --bg-panel: rgba(255, 255, 255, 0.75);
  --bg-card: rgba(255, 255, 255, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  --border-color: rgba(0, 0, 0, 0.06);
  --border-inner: rgba(0, 0, 0, 0.04);

  --correct: #16a34a;
  --correct-bg: rgba(22, 163, 74, 0.1);
  --wrong: #dc2626;
  --wrong-bg: rgba(220, 38, 38, 0.12);
  --cursor: #6366f1;

  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.1);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);

  --glass-blur: blur(20px);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);

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

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

html.dark-mode {
  --bg-primary: #0a0a0f;
  --bg-secondary: rgba(20, 20, 35, 0.6);
  --bg-panel: rgba(30, 30, 50, 0.65);
  --bg-card: rgba(25, 25, 45, 0.8);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-color: rgba(255, 255, 255, 0.06);
  --border-inner: rgba(255, 255, 255, 0.04);

  --cursor: #818cf8;
  --correct: #4ade80;
  --correct-bg: rgba(74, 222, 128, 0.1);

  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* =========================
   BASE
========================= */

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.4s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: #fff;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 50px; }

/* Particle Canvas */
#particleCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

html.dark-mode #particleCanvas {
  opacity: 0.35;
}

/* =========================
   CONTAINER
========================= */

.container {
  max-width: 960px;
  width: 100%;
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: translateY(24px);
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.1s forwards;
}

@keyframes slideUpFade {
  to { opacity: 1; transform: translateY(0); }
}

/* =========================
   HEADER
========================= */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding: 0 4px;
}

.title-group {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.title {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 4px;
}

.title-icon {
  font-size: 1.8rem;
  -webkit-text-fill-color: initial;
  animation: titleBounce 2s ease-in-out infinite;
}

@keyframes titleBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.title-dot {
  -webkit-text-fill-color: initial;
  color: var(--accent);
}

.title-tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Streak Badge */
.streak-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid rgba(99, 102, 241, 0.15);
  transition: all var(--transition-normal);
}

.streak-badge:hover {
  transform: scale(1.05);
}

/* Sound Toggle */
.sound-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.sound-toggle:hover {
  background: var(--bg-panel);
  color: var(--text-primary);
  transform: scale(1.06);
}

.sound-toggle .sound-on { display: block; }
.sound-toggle .sound-off { display: none; }
.sound-toggle.muted .sound-on { display: none; }
.sound-toggle.muted .sound-off { display: block; }

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.theme-toggle:hover {
  background: var(--bg-panel);
  color: var(--text-primary);
  transform: scale(1.06) rotate(15deg);
}

.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
html.dark-mode .theme-toggle .icon-sun { display: none; }
html.dark-mode .theme-toggle .icon-moon { display: block; }

/* =========================
   SELECTORS GRID
========================= */

.selectors-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

@media (max-width: 640px) {
  .selectors-grid { grid-template-columns: 1fr; }
}

.selector-panel {
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--glass-shadow);
  transition: all var(--transition-normal);
}

.selector-panel:hover {
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: var(--shadow-md);
}

.panel-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.options-flex {
  display: flex;
  gap: 8px;
}

.opt-btn {
  flex: 1;
  padding: 11px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  position: relative;
  overflow: hidden;
}

.opt-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.opt-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--text-primary);
}

.opt-btn:active {
  transform: translateY(0) scale(0.98);
}

/* Difficulty Dots */
.opt-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-easy { background: #22c55e; }
.dot-medium { background: #eab308; }
.dot-hard { background: #ef4444; }

/* Active States */
.opt-btn.active[data-diff="easy"] {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.08);
}

.opt-btn.active[data-diff="medium"] {
  border-color: #eab308;
  background: rgba(234, 179, 8, 0.1);
  color: #b45309;
  box-shadow: 0 0 0 3px rgba(234, 179, 8, 0.08);
}

html.dark-mode .opt-btn.active[data-diff="medium"] { color: #facc15; }

.opt-btn.active[data-diff="hard"] {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.08);
}

.opt-btn.active[data-mode] {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

/* =========================
   TEST AREA
========================= */

.test-area {
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-xl);
  padding: 36px 40px;
  margin-bottom: 24px;
  border: 1px solid var(--border-color);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
}

.test-area::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.test-area.active::before {
  opacity: 1;
}

/* Test Header */
.test-area-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.badge-container {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--transition-normal);
}

.timer-display {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.timer-display.urgent {
  color: var(--wrong);
  border-color: rgba(220, 38, 38, 0.3);
  background: var(--wrong-bg);
  animation: timerPulse 0.5s ease-in-out infinite alternate;
}

@keyframes timerPulse {
  to { transform: scale(1.05); }
}

/* Live Stats */
.live-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 28px;
  padding: 14px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-inner);
  animation: slideUpFade 0.4s ease;
}

.live-stats.hidden { display: none; }

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

.live-stat-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.live-stat-errors {
  color: var(--wrong) !important;
}

.live-stat-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

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

/* =========================
   TEXT DISPLAY
========================= */

.text-container-wrapper {
  position: relative;
  margin-bottom: 32px;
  min-height: 120px;
  width: 100%;
}

.text-display {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 2.2;
  font-weight: 500;
  text-align: left;
  display: flex;
  flex-wrap: wrap;
  gap: 0 12px;
  user-select: none;
  transition: transform 0.3s ease;
}

.placeholder-text {
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.6;
}

.word-box {
  display: inline-flex;
  white-space: nowrap;
  position: relative;
}

.text-display span {
  position: relative;
  color: var(--text-muted);
  transition: color 0.1s ease;
  border-radius: 2px;
}

.text-display span.correct {
  color: var(--text-primary);
}

html.dark-mode .text-display span.correct {
  color: #e2e8f0;
}

.text-display span.wrong {
  color: var(--wrong);
  background-color: var(--wrong-bg);
  border-radius: 3px;
  animation: charShake 0.25s ease;
}

@keyframes charShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-2px); }
  75% { transform: translateX(2px); }
}

/* Caret */
.typing-caret {
  position: absolute;
  width: 2.5px;
  height: 2rem;
  background: var(--cursor);
  left: 0;
  top: 0;
  transition: left 0.08s cubic-bezier(0.1, 0.9, 0.2, 1), top 0.12s ease;
  pointer-events: none;
  z-index: 10;
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent-glow);
}

.typing-caret.blinking {
  animation: caretBlink 1s ease-in-out infinite;
}

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

/* Focus Overlay */
.focus-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.02);
  backdrop-filter: blur(5px);
  border-radius: var(--radius-xl);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 20;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.focus-overlay.active {
  display: flex;
}

html.dark-mode .focus-overlay {
  background: rgba(0, 0, 0, 0.15);
}

.focus-overlay-content {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  animation: focusBounce 2s ease-in-out infinite;
}

@keyframes focusBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* Hidden Input */
.hidden-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* =========================
   ACTION BUTTONS
========================= */

.action-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.btn {
  padding: 12px 28px;
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 650;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-ghost {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  background: var(--bg-panel);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* =========================
   RESULTS PANEL
========================= */

.results-panel {
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-xl);
  padding: 40px;
  border: 1px solid var(--border-color);
  box-shadow: var(--glass-shadow);
  animation: resultsReveal 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes resultsReveal {
  from { opacity: 0; transform: scale(0.95) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.results-header {
  text-align: center;
  margin-bottom: 32px;
}

.results-trophy {
  font-size: 3rem;
  animation: trophyBounce 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-block;
}

@keyframes trophyBounce {
  0% { transform: scale(0) rotate(-20deg); }
  50% { transform: scale(1.3) rotate(10deg); }
  100% { transform: scale(1) rotate(0deg); }
}

.results-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-top: 8px;
}

.results-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

@media (max-width: 640px) {
  .results-grid { grid-template-columns: repeat(2, 1fr); }
}

.result-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  border: 1px solid var(--border-inner);
  transition: all var(--transition-normal);
  animation: cardReveal 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.result-card:nth-child(1) { animation-delay: 0.1s; }
.result-card:nth-child(2) { animation-delay: 0.2s; }
.result-card:nth-child(3) { animation-delay: 0.3s; }
.result-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes cardReveal {
  from { opacity: 0; transform: translateY(20px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.result-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Animated Ring */
.result-ring {
  width: 90px;
  height: 90px;
  position: relative;
  margin: 0 auto 10px;
}

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

.ring-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 6;
}

.ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: 264;
  stroke-dashoffset: 264;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.ring-fill-green {
  stroke: var(--correct);
}

.ring-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 800;
}

.result-big-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.result-errors-value {
  color: var(--wrong);
}

.result-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* Graph */
.graph-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border-inner);
  margin-bottom: 24px;
}

.graph-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.analytics-graph {
  width: 100%;
  height: 200px;
}

.graph-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 2px 4px var(--accent-glow));
}

.graph-area {
  fill: url(#graphGradient);
  opacity: 0.2;
}

.graph-axis {
  stroke: var(--border-color);
  stroke-width: 1;
}

.graph-text {
  fill: var(--text-muted);
  font-size: 11px;
  font-family: var(--font-sans);
}

.graph-grid {
  stroke: var(--border-inner);
  stroke-width: 0.5;
  stroke-dasharray: 4 4;
}

/* Personal Best */
.personal-best {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(234, 179, 8, 0.08));
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: #b45309;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 24px;
  animation: personalBestPop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

html.dark-mode .personal-best {
  color: #fbbf24;
}

@keyframes personalBestPop {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

/* Results Actions */
.results-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

/* =========================
   KEYBOARD HINT
========================= */

.keyboard-hint {
  text-align: center;
  padding: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
  animation: slideUpFade 0.7s ease 0.5s both;
}

.kbd {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* =========================
   TOAST
========================= */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: auto;
  backdrop-filter: var(--glass-blur);
}

.toast.toast-out {
  animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateX(40px) scale(0.9); }
}

/* =========================
   RESPONSIVE
========================= */

@media (max-width: 640px) {
  body { padding: 16px; }
  .header { flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
  .title { font-size: 1.8rem; }
  .title-tag { display: none; }
  .test-area { padding: 24px 20px; }
  .text-display { font-size: 1.15rem; line-height: 2; gap: 0 10px; }
  .selectors-grid { gap: 10px; margin-bottom: 16px; }
  .opt-btn { padding: 9px 6px; font-size: 0.75rem; }
  .results-panel { padding: 24px 20px; }
  .results-title { font-size: 1.4rem; }
  .live-stats { gap: 16px; padding: 12px 16px; }
  .live-stat-value { font-size: 1.1rem; }
  .keyboard-hint { display: none; }
  .streak-badge { display: none; }
}

/* =========================
   HIDDEN UTILITY
========================= */

.hidden {
  display: none !important;
}

/* =========================
   CONFETTI
========================= */

.confetti-piece {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  animation: confettiFall 1.8s ease-out forwards;
}

@keyframes confettiFall {
  0% { opacity: 1; transform: translateY(0) rotate(0deg) scale(1); }
  100% { opacity: 0; transform: translateY(500px) rotate(1080deg) scale(0.2); }
}