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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --accent: #58a6ff;
  --accent-glow: rgba(88, 166, 255, 0.3);
  --success: #3fb950;
  --error: #f85149;
  --warning: #e3b341;
  --text: #e6edf3;
  --text-muted: #7d8590;
  --font: 'Courier New', Courier, monospace;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Background grid effect */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(88, 166, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 166, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

#app {
  width: 100%;
  max-width: 700px;
  padding: 24px;
  position: relative;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}

h1 {
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
}

#highscore-display {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

#highscore {
  color: var(--warning);
}

/* Screens */
.screen {
  display: none;
}

.screen.active {
  display: block;
}

/* Start Screen */
#start-screen {
  text-align: center;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 32px;
  letter-spacing: 0.1em;
  font-size: 1rem;
}

.difficulty-selector {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.mode-selector {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
}

.mode-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  transition: all 0.2s;
}

.mode-btn:hover,
.mode-btn.active {
  border-color: var(--error);
  color: var(--error);
  box-shadow: 0 0 10px rgba(248, 81, 73, 0.2);
}

.mode-btn[data-mode="normal"]:hover,
.mode-btn[data-mode="normal"].active {
  border-color: var(--success);
  color: var(--success);
  box-shadow: 0 0 10px rgba(63, 185, 80, 0.2);
}

.diff-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  transition: all 0.2s;
}

.diff-btn:hover,
.diff-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}

.primary-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 14px 48px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 1rem;
  letter-spacing: 0.3em;
  transition: all 0.2s;
  text-shadow: 0 0 10px var(--accent-glow);
  box-shadow: 0 0 20px var(--accent-glow);
}

.primary-btn:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 30px var(--accent-glow);
}

.ready-message {
  text-align: center;
  padding: 60px 0;
}

.ready-text {
  font-size: 1.2rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

kbd {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  font-family: var(--font);
  font-size: 1rem;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Game Screen */
.stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
  padding: 16px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

.stat span:last-child {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--text);
}

.timer-stat span:last-child {
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-glow);
}

.timer-stat.warning span:last-child {
  color: var(--warning);
  text-shadow: 0 0 10px rgba(227, 179, 65, 0.4);
  animation: pulse 0.5s ease-in-out infinite alternate;
}

@keyframes pulse {
  from { opacity: 1; }
  to { opacity: 0.5; }
}

/* Word Display */
#word-container {
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 32px;
}

#word-display {
  font-size: 3rem;
  letter-spacing: 0.15em;
  color: var(--text);
  transition: all 0.15s;
}

#word-display.correct-flash {
  color: var(--success);
  text-shadow: 0 0 20px rgba(63, 185, 80, 0.5);
}

#word-display.wrong-flash {
  color: var(--error);
  text-shadow: 0 0 20px rgba(248, 81, 73, 0.5);
  animation: shake 0.2s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

/* Typed characters coloring */
#word-display span.correct {
  color: var(--success);
}

#word-display span.wrong {
  color: var(--error);
  text-decoration: underline;
}

#word-display span.pending {
  color: var(--text-muted);
}

/* Input */
#input-container {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

#type-input {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 20px;
  font-family: var(--font);
  font-size: 1.1rem;
  color: var(--text);
  text-align: center;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  letter-spacing: 0.1em;
}

#type-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

#type-input.input-wrong {
  border-color: var(--error);
  box-shadow: 0 0 10px rgba(248, 81, 73, 0.2);
}

/* Feedback */
.feedback {
  text-align: center;
  min-height: 24px;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--success);
  transition: opacity 0.3s;
}

/* Result Screen */
#result-screen {
  text-align: center;
}

#result-screen h2 {
  font-size: 1.6rem;
  letter-spacing: 0.4em;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
  margin-bottom: 36px;
}

.result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.result-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-item.highlight {
  border-color: var(--warning);
  box-shadow: 0 0 15px rgba(227, 179, 65, 0.15);
}

.result-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

.result-item span:last-child {
  font-size: 2rem;
  font-weight: bold;
}

.result-item.highlight span:last-child {
  color: var(--warning);
}

.new-record {
  color: var(--warning);
  font-size: 1rem;
  letter-spacing: 0.3em;
  margin-bottom: 24px;
  text-shadow: 0 0 15px rgba(227, 179, 65, 0.5);
  animation: flicker 0.5s ease-in-out infinite alternate;
}

@keyframes flicker {
  from { opacity: 1; }
  to { opacity: 0.6; }
}

.hidden {
  display: none !important;
}