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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #1a1a2e;
  color: #eee;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.container {
  text-align: center;
  max-width: 560px;
  width: 100%;
}

h1 {
  font-size: 3rem;
  color: #e94560;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.subtitle {
  color: #8888aa;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

/* ── Buttons ── */
.btn {
  padding: 0.7rem 1.8rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: #e94560;
  color: #fff;
}

.btn-secondary {
  background: #0f3460;
  color: #fff;
}

/* ── Letter display ── */
.letters-display {
  display: flex;
  gap: 2.5rem;
  justify-content: center;
  margin: 2rem 0 1.5rem;
}

.letters-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.group-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #6666aa;
}

.letters {
  display: flex;
  gap: 0.5rem;
}

.letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 62px;
  height: 62px;
  font-size: 1.9rem;
  font-weight: 700;
  border-radius: 10px;
  animation: pop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

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

.letter.vowel {
  background: #16213e;
  border: 2px solid #e94560;
  color: #e94560;
}

.letter.consonant {
  background: #16213e;
  border: 2px solid #2255aa;
  color: #7ec8e3;
}

/* ── Input row ── */
.input-section {
  margin: 0.5rem 0 1.2rem;
}

.input-row {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
}

input[type="text"] {
  padding: 0.7rem 1rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  border: 2px solid #0f3460;
  border-radius: 8px;
  background: #16213e;
  color: #eee;
  outline: none;
  min-width: 200px;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: #e94560;
}

/* ── Result ── */
.result {
  padding: 0.9rem 1.4rem;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  display: inline-block;
  max-width: 100%;
}

.result.success {
  background: #0e2e1a;
  border: 2px solid #4caf50;
  color: #81c784;
}

.result.error {
  background: #2e0e14;
  border: 2px solid #e94560;
  color: #ef9a9a;
}

/* ── Norwegian toggle ── */
.toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: #8888aa;
  margin-bottom: 1.5rem;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  display: none;
}

.toggle-track {
  position: relative;
  width: 40px;
  height: 22px;
  background: #16213e;
  border: 2px solid #0f3460;
  border-radius: 11px;
  transition: background 0.2s, border-color 0.2s;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: #6666aa;
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle-label input:checked + .toggle-track {
  background: #1a3a1a;
  border-color: #e94560;
}

.toggle-label input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
  background: #e94560;
}

/* ── Controls ── */
.controls {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  min-width: 140px;
}

.control-group label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #8888aa;
}

.control-group label span {
  color: #e94560;
  font-weight: 700;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #16213e;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #e94560;
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: #e94560;
  cursor: pointer;
}

/* ── Utility ── */
.hidden {
  display: none;
}