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

:root {
  --bg: #121213;
  --surface: #1a1a1b;
  --tile-default: #3a3a3c;
  --tile-absent: #3a3a3c;
  --tile-present: #b59f3b;
  --tile-correct: #538d4e;
  --text: #ffffff;
  --text-muted: #818384;
  --border: #565758;
  --key-bg: #818384;
  --key-bg-present: #b59f3b;
  --key-bg-correct: #538d4e;
  --key-bg-absent: #3a3a3c;
  --accent: #538d4e;
  --font: "DM Sans", system-ui, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
}

.hidden {
  display: none !important;
}

/* ---------- Level screen ---------- */
.level-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  text-align: center;
}

.level-screen h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 0 0 0.25rem;
}

.level-screen > p {
  color: var(--text-muted);
  margin: 0 0 2rem;
  font-size: 1.1rem;
}

.level-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.level-title-row h1 {
  margin: 0;
}

/* ---------- How to play button ---------- */
.how-to-play-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.how-to-play-btn:hover {
  border-color: var(--text);
  color: var(--text);
  background: var(--surface);
}

/* ---------- How to play modal ---------- */
.how-to-play-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 1rem;
}

.how-to-play-modal {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 12px;
  max-width: 420px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.how-to-play-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.how-to-play-header h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.how-to-play-close {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, background 0.2s;
}

.how-to-play-close:hover {
  color: var(--text);
  background: var(--tile-default);
}

.how-to-play-body {
  padding: 1.25rem;
}

.how-to-play-body p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text);
}

.how-to-play-body p:last-of-type {
  margin-bottom: 0;
}

.how-to-play-body ul {
  margin: 0.5rem 0 1rem;
  padding-left: 1.5rem;
}

.how-to-play-body li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tile-demo {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
}

.tile-demo-correct {
  background: var(--tile-correct);
  border: 2px solid var(--tile-correct);
}

.tile-demo-present {
  background: var(--tile-present);
  border: 2px solid var(--tile-present);
}

.tile-demo-absent {
  background: var(--tile-absent);
  border: 2px solid var(--tile-absent);
}

.level-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  max-width: 520px;
}

.level-btn {
  flex: 1 1 200px;
  min-width: 180px;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.level-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.level-btn .level-name {
  font-weight: 700;
}

.level-btn .level-desc {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
}

/* ---------- Game screen ---------- */
.game-screen {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 0;
}

.level-badge {
  padding: 0.35rem 0.75rem;
  background: var(--tile-default);
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: capitalize;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, background 0.2s;
}

.btn {
  background: var(--accent);
  color: var(--text);
}

.btn:hover {
  opacity: 0.9;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.btn-large {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

/* ---------- Hint toggle & area ---------- */
.hint-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-muted);
  user-select: none;
}

.hint-toggle input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.hint-toggle-label {
  white-space: nowrap;
}

.hint-area {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
  min-height: 1.5em;
  text-align: center;
  font-style: italic;
}

.hint-area:not(.hidden)::before {
  content: "Hint: ";
  font-style: normal;
  color: var(--text);
}

/* ---------- Board ---------- */
.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
}

.board {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.board-row {
  display: flex;
  gap: 5px;
  justify-content: center;
}

.tile {
  width: 52px;
  height: 52px;
  border: 2px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  text-transform: uppercase;
  transition: transform 0.1s, border-color 0.15s, background 0.2s, color 0.2s;
}

.tile.filled {
  border-color: var(--text);
  animation: pop 0.1s ease;
}

.tile.correct {
  background: var(--tile-correct);
  border-color: var(--tile-correct);
  color: var(--text);
  animation: flip 0.5s ease;
}

.tile.present {
  background: var(--tile-present);
  border-color: var(--tile-present);
  color: var(--text);
  animation: flip 0.5s ease;
}

.tile.absent {
  background: var(--tile-absent);
  border-color: var(--tile-absent);
  color: var(--text);
  animation: flip 0.5s ease;
}

.tile.shake {
  animation: shake 0.5s ease;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes flip {
  0% { transform: rotateX(0); }
  50% { transform: rotateX(90deg); }
  100% { transform: rotateX(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* Smaller tiles for 7-letter (expert) */
.board.size-7 .tile {
  width: 42px;
  height: 42px;
  font-size: 1.4rem;
}

.board.size-6 .tile {
  width: 46px;
  height: 46px;
  font-size: 1.5rem;
}

/* ---------- Keyboard ---------- */
.keyboard {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  max-width: 480px;
}

.keyboard-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}

.key {
  min-width: 36px;
  height: 48px;
  padding: 0 0.5rem;
  border: none;
  border-radius: 4px;
  background: var(--key-bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-transform: uppercase;
}

.key:hover {
  background: #6b6b6d;
}

.key:active {
  transform: scale(0.96);
}

.key.wide {
  min-width: 52px;
  font-size: 0.75rem;
}

.key.correct {
  background: var(--key-bg-correct);
  color: var(--text);
}

.key.present {
  background: var(--key-bg-present);
  color: var(--text);
}

.key.absent {
  background: var(--key-bg-absent);
  color: var(--text-muted);
}

/* ---------- Result overlay ---------- */
.result-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  padding: 1rem;
}

.result-box {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  max-width: 360px;
  width: 100%;
  text-align: center;
}

.result-box h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.result-word {
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--tile-correct);
  margin: 0 0 1.5rem;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

@media (max-width: 420px) {
  .tile {
    width: 46px;
    height: 46px;
    font-size: 1.5rem;
  }

  .board.size-7 .tile {
    width: 36px;
    height: 36px;
    font-size: 1.15rem;
  }

  .board.size-6 .tile {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
  }

  .key {
    min-width: 28px;
    height: 44px;
    font-size: 0.8rem;
  }

  .key.wide {
    min-width: 42px;
  }
}