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

:root {
  --bg: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-light: #999999;
  --border: #e0e0e0;
  --hover: #f5f5f5;
  --accent: #333333;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
}

header {
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 40px;
  text-align: center;
}

h1 {
  color: var(--text-primary);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.5px;
  margin: 0 0 12px 0;
}

.subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-weight: 400;
}

.difficulty-selector {
  margin-bottom: 32px;
  padding: 16px;
  background-color: var(--hover);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.difficulty-label {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.difficulty-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.difficulty-btn {
  background-color: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 20px;
  font-weight: 500;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: all 0.2s ease;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
}

.difficulty-btn:hover {
  border-color: var(--accent);
  background-color: var(--text-secondary);
  color: var(--bg);
}

.difficulty-btn.active {
  background-color: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.custom-time-input {
  margin-top: 12px;
}

.custom-time-input input {
  width: 100%;
  max-width: 250px;
  margin: 0 auto;
  padding: 10px;
  font-size: 14px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  text-align: center;
}

.custom-time-input input:focus {
  outline: none;
  border-color: var(--accent);
}

.stats-row {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  gap: 40px;
}

.stat {
  text-align: center;
}

.label {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 8px;
  letter-spacing: 0.3px;
  font-weight: 500;
}

.value {
  font-size: 32px;
  color: var(--text-primary);
  font-weight: 600;
}

.word-display {
  background-color: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 48px 24px;
  font-size: 36px;
  margin-bottom: 24px;
  color: var(--text-primary);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
  font-weight: 500;
}

.word-display.correct {
  background-color: #f0f0f0;
  border-color: var(--accent);
}

input {
  width: 100%;
  background-color: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  font-size: 18px;
  color: var(--text-primary);
  outline: none;
  margin-bottom: 24px;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.3px;
}

input:focus {
  border-color: var(--accent);
}

input:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background-color: var(--hover);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 12px;
}

button {
  background-color: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  padding: 12px 28px;
  font-weight: 500;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: all 0.2s ease;
  font-family: 'Inter', sans-serif;
  font-size: 14px;
}

button:hover:not(:disabled) {
  background-color: #1a1a1a;
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#reset-btn {
  background-color: #666666;
}

#reset-btn:hover:not(:disabled) {
  background-color: #555555;
}

.match-feedback {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
  opacity: 0;
  transform: translateY(-5px);
  transition: all 0.3s ease;
  min-height: 20px;
}

.match-feedback.show {
  opacity: 1;
  transform: translateY(0);
}