/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --felt: #1a3a2a;
  --felt-dark: #0f281b;
  --wood: #2b1810;
  --wood-light: #5a3a28;
  --parchment: #f5e6c8;
  --parchment-dark: #e8d5b0;
  --tile-bg: #fff8e7;
  --tile-border: #c4a882;
  --tile-shadow: #b89a70;
  --ink: #1a1a2e;
  --ink-light: #5a4a3a;
  --gold: #f39c12;
  --gold-glow: #f1c40f;
  --green: #2ecc71;
  --green-dark: #27ae60;
  --red: #e74c3c;
  --red-dark: #c0392b;
  --ladder-arrow: #8b7355;
  --white: #ffffff;
  --font-title: Georgia, Cambria, "Times New Roman", serif;
  --font-hud: "Trebuchet MS", Verdana, system-ui, sans-serif;
  --font-mono: "Courier New", ui-monospace, monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 12px rgba(0,0,0,0.3);
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: var(--font-hud);
  background: var(--felt);
  color: var(--ink);
  -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#app {
  width: 100%; height: 100%;
  position: relative;
}

.screen {
  position: absolute; inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.screen.active { display: flex; }

.hidden { display: none !important; }

/* ===== START SCREEN ===== */
#start-screen {
  background: radial-gradient(ellipse at center, var(--felt) 0%, var(--felt-dark) 100%);
  padding: 20px;
}
.start-frame {
  max-width: 440px; width: 100%;
  display: flex; flex-direction: column; align-items: center;
  gap: 20px;
}
.title-block {
  text-align: center;
  position: relative;
  padding: 24px 20px 16px;
  background: linear-gradient(180deg, rgba(245,230,200,0.15), transparent);
  border: 2px solid rgba(245,230,200,0.2);
  border-radius: 20px;
  width: 100%;
}
.game-title {
  font-family: var(--font-title);
  font-size: 3rem;
  color: var(--parchment);
  text-shadow: 0 3px 0 var(--wood), 0 6px 16px rgba(0,0,0,0.5);
  letter-spacing: 1px;
  line-height: 1.1;
}
.title-ornament {
  width: 80px; height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: 0 auto 12px;
  border-radius: 2px;
}
.title-sub {
  color: var(--parchment-dark);
  font-size: 0.9rem;
  margin-top: 6px;
  opacity: 0.8;
}

/* Difficulty cards */
.difficulty-cards {
  display: flex;
  gap: 10px;
  width: 100%;
}
.diff-card {
  flex: 1;
  display: flex; flex-direction: column; align-items: center;
  gap: 4px;
  padding: 14px 8px;
  border: 3px solid var(--tile-border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--tile-bg), var(--parchment));
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 0 4px 0 var(--tile-shadow), 0 6px 16px rgba(0,0,0,0.25);
  font-family: var(--font-hud);
}
.diff-card:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 var(--tile-shadow), 0 3px 8px rgba(0,0,0,0.2);
}
.diff-icon {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--wood);
  background: var(--gold);
  width: 36px; height: 36px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: inset 0 -2px 0 rgba(0,0,0,0.15);
}
.diff-label {
  font-weight: 800;
  font-size: 1rem;
}
.diff-desc {
  font-size: 0.75rem;
  color: var(--ink-light);
}

.daily-btn {
  width: 100%;
  padding: 14px;
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  gap: 8px;
}
.daily-icon { color: var(--gold); font-size: 1.2rem; }
.puzzle-count {
  color: var(--parchment-dark);
  font-size: 0.8rem;
  opacity: 0.6;
}

/* ===== GAME SCREEN ===== */
#game-screen {
  background: radial-gradient(ellipse at center 30%, #1f4634, var(--felt-dark));
}
.game-container {
  width: 100%; max-width: 480px;
  height: 100%;
  display: flex; flex-direction: column;
  padding: 8px 12px;
  position: relative;
  overflow: hidden;
}

/* Header */
.game-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  flex-shrink: 0;
}
.icon-btn {
  width: 36px; height: 36px;
  border: 2px solid var(--tile-border);
  border-radius: var(--radius-sm);
  background: var(--parchment);
  color: var(--ink);
  font-size: 1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 0 var(--tile-shadow);
  transition: transform 0.08s;
}
.icon-btn:active { transform: translateY(2px); box-shadow: 0 0 0 var(--tile-shadow); }
.hud-info { display: flex; gap: 6px; flex-shrink: 0; }
.hud-chip {
  display: inline-flex; align-items: center;
  padding: 4px 10px;
  border: 2px solid var(--tile-border);
  border-radius: 999px;
  background: var(--tile-bg);
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: 0 2px 0 var(--tile-shadow);
  white-space: nowrap;
}
.diff-chip { background: linear-gradient(180deg, var(--gold), #e67e22); color: #fff; border-color: #b86d1e; }
.hud-stats {
  display: flex; gap: 6px;
  margin-left: auto;
}
.stat-chip {
  display: flex; flex-direction: column; align-items: center;
  padding: 3px 8px;
  background: var(--tile-bg);
  border: 2px solid var(--tile-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 0 var(--tile-shadow);
  min-width: 44px;
}
.stat-label { font-size: 0.6rem; color: var(--ink-light); font-weight: 600; }
.stat-value { font-size: 0.95rem; font-weight: 900; font-family: var(--font-mono); }
.goal-chip .stat-value { color: var(--green-dark); }

/* Target banner */
.target-banner {
  text-align: center;
  padding: 6px 0;
  flex-shrink: 0;
}
.target-label {
  font-size: 0.8rem;
  color: var(--parchment-dark);
  font-weight: 600;
  margin-right: 6px;
}
.target-word {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--gold);
  text-shadow: 0 0 20px rgba(243,156,18,0.3);
  letter-spacing: 6px;
}

/* Ladder area */
.ladder-area {
  flex: 1;
  overflow-y: auto;
  margin: 4px 0;
  -webkit-overflow-scrolling: touch;
  position: relative;
}
.ladder-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 0;
  min-height: 100%;
}
.ladder-word {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: var(--tile-bg);
  border: 2px solid var(--tile-border);
  box-shadow: 0 2px 0 var(--tile-shadow);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 4px;
  transition: all 0.15s;
  position: relative;
}
.ladder-word.start-word {
  border-color: var(--gold);
  background: linear-gradient(180deg, #fff8e7, #f5e6c8);
  box-shadow: 0 2px 0 var(--tile-shadow), 0 0 12px rgba(243,156,18,0.2);
}
.ladder-word.target-word-reached {
  border-color: var(--green);
  background: linear-gradient(180deg, #e8f8e8, #d0f0d0);
  box-shadow: 0 2px 0 var(--green-dark);
}
.ladder-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ladder-arrow);
  font-size: 0.8rem;
  height: 16px;
  opacity: 0.6;
}

/* Changed letter highlight */
.ladder-word .ladder-letter {
  display: inline-block;
  transition: all 0.2s;
}
.ladder-word .ladder-letter.changed {
  background: var(--gold);
  color: var(--ink);
  border-radius: 3px;
  padding: 0 2px;
  animation: letter-pop 0.2s ease-out;
}
@keyframes letter-pop {
  0% { transform: scale(1.3); }
  100% { transform: scale(1); }
}

/* Input area */
.input-area {
  flex-shrink: 0;
  padding: 6px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.letter-slots {
  display: flex;
  gap: 6px;
  justify-content: center;
}
.letter-slot {
  width: 44px; height: 50px;
  border: 3px solid var(--tile-border);
  border-radius: var(--radius-sm);
  background: var(--tile-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--ink);
  text-transform: uppercase;
  box-shadow: 0 3px 0 var(--tile-shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
  position: relative;
}
.letter-slot.active {
  border-color: var(--gold);
  box-shadow: 0 3px 0 var(--tile-shadow), 0 0 0 3px rgba(243,156,18,0.25);
  animation: slot-pulse 1.5s ease-in-out infinite;
}
@keyframes slot-pulse {
  0%, 100% { box-shadow: 0 3px 0 var(--tile-shadow), 0 0 0 3px rgba(243,156,18,0.25); }
  50% { box-shadow: 0 3px 0 var(--tile-shadow), 0 0 0 5px rgba(243,156,18,0.1); }
}
.letter-slot.filled {
  border-color: var(--wood-light);
  background: var(--white);
}
.letter-slot.error-shake {
  animation: shake 0.3s ease-out;
  border-color: var(--red);
  box-shadow: 0 3px 0 var(--red-dark);
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.input-feedback {
  font-size: 0.8rem;
  font-weight: 600;
  min-height: 1.2em;
  color: var(--red);
  text-align: center;
}

/* Action bar */
.action-bar {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-shrink: 0;
  padding: 4px 0;
}
.sm-btn {
  padding: 8px 16px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}
.hint-btn { background: linear-gradient(180deg, var(--gold), #e67e22); }
.undo-btn { background: linear-gradient(180deg, var(--parchment), var(--parchment-dark)); }
.restart-btn { background: linear-gradient(180deg, #e8d5b0, var(--parchment-dark)); }

/* Keyboard */
.keyboard {
  flex-shrink: 0;
  padding: 4px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.kb-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}
.key-btn {
  width: 32px; height: 42px;
  border: 2px solid var(--tile-border);
  border-radius: 6px;
  background: linear-gradient(180deg, var(--tile-bg), var(--parchment));
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 3px 0 var(--tile-shadow);
  transition: transform 0.05s;
  display: flex; align-items: center; justify-content: center;
  text-transform: uppercase;
  font-family: var(--font-hud);
}
.key-btn:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--tile-shadow);
}
.kb-wide { width: 52px; }
.kb-action {
  background: linear-gradient(180deg, var(--green), var(--green-dark));
  color: #fff;
  border-color: var(--green-dark);
  width: 48px;
  font-weight: 800;
}

/* ===== WIN SCREEN ===== */
#win-screen {
  background: rgba(0,0,0,0.6);
  z-index: 10;
}
.win-overlay {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, rgba(243,156,18,0.08), transparent);
}
.win-panel {
  position: relative;
  max-width: 360px; width: 90%;
  padding: 32px 24px 24px;
  border: 3px solid var(--gold);
  border-radius: 20px;
  background: linear-gradient(180deg, var(--tile-bg), var(--parchment));
  box-shadow: 0 8px 0 var(--tile-shadow), 0 24px 48px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  z-index: 1;
}
.win-stars {
  display: flex;
  gap: 8px;
}
.win-stars .star {
  font-size: 2.2rem;
  color: #ddd;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform: scale(0);
}
.win-stars .star.active {
  color: var(--gold);
  text-shadow: 0 0 16px rgba(243,156,18,0.5);
  transform: scale(1);
}
.win-title {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--ink);
}
.win-stats {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.win-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: rgba(0,0,0,0.03);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
}
.win-num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 900;
}
.win-message {
  font-size: 0.9rem;
  color: var(--ink-light);
  text-align: center;
  font-weight: 600;
}
.win-buttons {
  display: flex;
  gap: 8px;
  width: 100%;
}
.win-buttons .game-button { flex: 1; text-align: center; padding: 10px; font-size: 0.85rem; }

/* ===== BUTTONS ===== */
.game-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--gold), #e67e22);
  color: var(--ink);
  font-family: var(--font-hud);
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--ink), 0 8px 20px rgba(0,0,0,0.25);
  transition: transform 0.08s, box-shadow 0.08s;
  padding: 12px 20px;
  font-size: 1rem;
}
.game-button:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 var(--ink), 0 4px 12px rgba(0,0,0,0.2);
}
.secondary-btn {
  background: linear-gradient(180deg, var(--parchment), var(--parchment-dark));
  color: var(--ink);
  box-shadow: 0 4px 0 var(--tile-shadow), 0 6px 16px rgba(0,0,0,0.2);
}

/* ===== HINT OVERLAY ===== */
.hint-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hint-panel {
  max-width: 320px; width: 85%;
  padding: 24px 20px 20px;
  border: 3px solid var(--gold);
  border-radius: 16px;
  background: var(--tile-bg);
  box-shadow: 0 8px 0 var(--tile-shadow), 0 24px 48px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.hint-title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  color: var(--ink);
}
.hint-text {
  font-size: 0.95rem;
  color: var(--ink-light);
  text-align: center;
  line-height: 1.4;
}
.hint-close-btn {
  background: linear-gradient(180deg, var(--gold), #e67e22);
  padding: 8px 28px;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  left: 50%; bottom: 90px;
  transform: translateX(-50%);
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(0,0,0,0.85);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  z-index: 30;
  pointer-events: none;
  transition: opacity 0.25s;
  opacity: 0;
  white-space: nowrap;
}
.toast.show { opacity: 1; }
.toast.error { background: rgba(231,76,60,0.9); }

/* ===== CONFETTI ===== */
.confetti-canvas {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 15;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 420px) {
  .game-title { font-size: 2.2rem; }
  .difficulty-cards { gap: 6px; }
  .diff-card { padding: 10px 6px; }
  .diff-icon { width: 30px; height: 30px; font-size: 1.3rem; }
  .letter-slot { width: 38px; height: 44px; font-size: 1.2rem; }
  .key-btn { width: 28px; height: 38px; font-size: 0.75rem; }
  .kb-wide { width: 44px; }
  .kb-action { width: 42px; }
  .target-word { font-size: 1.3rem; }
  .ladder-word { font-size: 1rem; padding: 4px 10px; }
  .win-panel { padding: 24px 16px 20px; }
  .hud-stats .stat-chip { min-width: 36px; padding: 2px 6px; }
  .stat-value { font-size: 0.85rem; }
}

@media (min-width: 768px) {
  .game-container { max-width: 520px; }
  .letter-slot { width: 52px; height: 58px; font-size: 1.6rem; }
  .key-btn { width: 38px; height: 48px; font-size: 0.9rem; }
  .kb-wide { width: 60px; }
  .kb-action { width: 56px; }
}