/**
 * Word Forge - Main Stylesheet
 * Mobile-first responsive design
 */

/* ===== CSS Variables ===== */
:root {
  /* Modern Blue & Coral Palette (Distinctive from Wordle) */
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --grey: #64748b;
  --grey-light: #cbd5e1;
  --grey-lighter: #f1f5f9;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --background: #ffffff;
  --surface: #f8fafc;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;

  /* Spacing - Mobile-first */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-2xl: 32px;

  /* Typography */
  --font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-xxl: 28px;
  --font-size-huge: 36px;

  /* Shadows - Subtle */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Transitions */
  --transition: 0.15s ease-in-out;
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--background);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Loading Screen ===== */
#loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--background);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--grey-lighter);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#loading-screen p {
  margin-top: var(--spacing-xl);
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
}

/* ===== Game Container ===== */
#game-container {
  max-width: 500px;
  margin: 0 auto;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

@media (min-width: 768px) {
  #game-container {
    padding: var(--spacing-lg) var(--spacing-xl);
    min-height: auto;
  }
}

/* ===== Header ===== */
.game-header {
  padding: 10px var(--spacing-md) 8px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--border);
  position: relative;
}

.header-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-content h1 {
  font-size: 22px;
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

.date {
  display: none; /* Hide on mobile */
}

.score-container {
  display: flex;
  gap: var(--spacing-md);
  margin-right: 32px; /* Space for hamburger button */
}

.score-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 40px;
}

.score-item .label {
  font-size: 8px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  font-weight: 600;
  margin-bottom: -2px;
}

.score-item .value {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

@media (min-width: 768px) {
  .game-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    flex-direction: column;
    text-align: center;
  }

  .header-content h1 {
    font-size: 42px;
    margin-bottom: var(--spacing-xs);
  }

  .date {
    display: block;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 400;
  }

  .score-container {
    margin-top: var(--spacing-lg);
    justify-content: center;
    gap: var(--spacing-2xl);
  }

  .score-item .label {
    font-size: var(--font-size-xs);
    margin-bottom: var(--spacing-xs);
  }

  .score-item .value {
    font-size: var(--font-size-xxl);
  }

  .hamburger-button {
    top: var(--spacing-lg);
    right: var(--spacing-xl);
    transform: none;
  }
}

/* ===== Progress ===== */
.progress-container {
  padding: 0 var(--spacing-md) 6px;
  text-align: center;
}

.progress-text {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
}

@media (min-width: 768px) {
  .progress-container {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }

  .progress-text {
    font-size: var(--font-size-sm);
  }
}

/* ===== Message Display ===== */
.message {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  margin: 0 var(--spacing-md) var(--spacing-sm);
  text-align: center;
  font-weight: 500;
  animation: slideDown 0.2s ease-out;
  font-size: var(--font-size-sm);
}

.message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.message.info {
  background: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Letter Grid ===== */
.letter-grid-container {
  padding: 0 var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.instructions {
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  margin-bottom: var(--spacing-sm);
  font-weight: 400;
  padding: 0;
}

@media (min-width: 768px) {
  .letter-grid-container {
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-xl);
  }

  .instructions {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
  }
}

.letter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
  gap: var(--spacing-sm);
  max-width: 380px;
  margin: 0 auto;
}

.letter-tile {
  aspect-ratio: 1;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 54px;
  -webkit-tap-highlight-color: transparent;
}

.letter-tile:hover:not(:disabled) {
  transform: scale(1.05);
  opacity: 0.9;
}

.letter-tile:active:not(:disabled) {
  transform: scale(0.95);
}

.letter-tile .letter {
  font-size: 24px;
}

.letter-tile .usage {
  font-size: 10px;
  opacity: 0.85;
  margin-top: var(--spacing-xs);
  font-weight: 600;
}

/* Power Letter */
.letter-tile.power-letter {
  background: var(--accent);
  position: relative;
}

.letter-tile.power-letter::before {
  content: '⭐';
  position: absolute;
  top: 4px;
  right: 4px;
  font-size: 12px;
}

/* Maxed out letter */
.letter-tile.maxed {
  background: var(--grey-light);
  cursor: not-allowed;
  opacity: 0.5;
  color: var(--grey);
}

.hint-text {
  text-align: center;
  color: var(--text-light);
  font-size: 10px;
  margin-top: var(--spacing-md);
  font-weight: 400;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .letter-grid {
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: var(--spacing-md);
    max-width: 450px;
  }

  .letter-tile {
    min-height: 70px;
  }

  .letter-tile .letter {
    font-size: 28px;
  }

  .hint-text {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-lg);
  }
}

/* ===== Input Section ===== */
.input-section {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .input-section {
    margin-bottom: var(--spacing-xl);
    padding: 0;
    gap: var(--spacing-sm);
  }
}

.input-wrapper {
  flex: 1;
  display: flex;
  gap: var(--spacing-xs);
  background: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  border: 2px solid var(--border);
  transition: border-color var(--transition);
  min-width: 0; /* Allow flex item to shrink below content size */
}

.input-wrapper:focus-within {
  border-color: var(--grey);
}

.word-input {
  flex: 1;
  min-width: 0; /* Allow input to shrink */
  border: none;
  background: transparent;
  font-size: var(--font-size-base);
  font-weight: 700;
  padding: var(--spacing-sm);
  outline: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text);
}

.word-input::placeholder {
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
  color: var(--text-light);
  font-size: var(--font-size-sm);
}

@media (min-width: 768px) {
  .word-input {
    font-size: var(--font-size-lg);
    padding: var(--spacing-md);
    letter-spacing: 2px;
  }

  .word-input::placeholder {
    font-size: var(--font-size-base);
  }
}

.word-input.shake {
  animation: shake 0.4s ease-in-out;
}

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

.btn {
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--primary);
  color: white;
  min-width: 70px;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary:active {
  transform: scale(0.96);
}

.btn-secondary {
  background: var(--grey-lighter);
  color: var(--text);
  padding: var(--spacing-sm);
  min-width: 44px;
}

.btn-secondary:hover {
  background: var(--grey-light);
}

@media (min-width: 768px) {
  .word-input {
    font-size: var(--font-size-xl);
  }

  .btn {
    min-height: 56px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }

  .btn-primary {
    min-width: 100px;
  }

  .btn-secondary {
    padding: var(--spacing-md);
    min-width: 50px;
  }
}

/* ===== Word List ===== */
.word-list-container {
  background: var(--surface);
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  margin: 0 var(--spacing-md) var(--spacing-md);
  border: 1px solid var(--border);
}

.word-list-container h2 {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
  color: var(--text);
  font-weight: 700;
}

@media (min-width: 768px) {
  .word-list-container {
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
  }

  .word-list-container h2 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
  }
}

.word-list {
  max-height: 300px;
  overflow-y: auto;
}

.empty-state {
  text-align: center;
  color: var(--text-light);
  padding: var(--spacing-2xl) var(--spacing-md);
  font-style: italic;
  font-size: var(--font-size-sm);
}

/* Word Cloud */
.word-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm) var(--spacing-md);
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-sm);
  min-height: 100px;
}

.word-cloud-item {
  display: inline-block;
  font-weight: 700;
  transition: all 0.2s;
  cursor: default;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1.4;
}

.word-cloud-item:hover {
  transform: scale(1.1);
  background: var(--grey-lighter);
}

.word-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-xs);
  border-bottom: 1px solid var(--grey-lighter);
  transition: background var(--transition);
}

.word-item:last-child {
  border-bottom: none;
}

.word-item:hover {
  background: var(--grey-lighter);
}

.word-item.new {
  animation: slideIn 0.4s ease-out;
  background: #f0fdf4;
}

@media (min-width: 768px) {
  .word-list {
    max-height: 400px;
  }

  .word-item {
    padding: var(--spacing-md);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.word-item .word {
  font-weight: 600;
  font-size: var(--font-size-base);
  color: var(--text);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.word-item .points {
  color: var(--success);
  font-weight: 700;
  font-size: var(--font-size-sm);
}

/* ===== Celebration Message ===== */
.celebration-message {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--success);
  color: white;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-xxl);
  font-weight: 700;
  text-align: center;
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  animation: celebrationPop 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  line-height: 1.3;
  max-width: 90%;
}

.celebration-message.fade-out {
  animation: fadeOut 0.3s ease-out forwards;
}

@keyframes celebrationPop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.5);
  }
  50% {
    transform: translate(-50%, -50%) scale(1.05);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
  }
}

@media (min-width: 768px) {
  .celebration-message {
    font-size: var(--font-size-huge);
    max-width: 400px;
  }
}

/* ===== Hamburger Menu Button ===== */
.hamburger-button {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 100;
  -webkit-tap-highlight-color: transparent;
}

.hamburger-button span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger-button.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.hamburger-button.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-button.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ===== Side Menu ===== */
.side-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  max-width: 85vw;
  height: 100vh;
  background: white;
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
  z-index: 5000;
  transition: right 0.3s ease;
  overflow-y: auto;
}

.side-menu.open {
  right: 0;
}

.side-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 4999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.side-menu-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.side-menu-header {
  padding: var(--spacing-lg);
  border-bottom: 2px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.side-menu-header h2 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin: 0;
  color: var(--text);
}

.side-menu-close {
  background: transparent;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

.side-menu-content {
  padding: var(--spacing-md);
}

.side-menu-section {
  margin-bottom: var(--spacing-xl);
}

.side-menu-section h3 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.5px;
}

/* Theme Menu Items */
.theme-menu-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid var(--border);
  margin-bottom: var(--spacing-sm);
  background: var(--surface);
}

.theme-menu-item:hover {
  background: var(--grey-lighter);
  border-color: var(--primary);
}

.theme-menu-item.active {
  border-color: var(--primary);
  background: #f0fdf4;
}

.theme-menu-item.locked {
  opacity: 0.6;
}

.theme-menu-preview {
  display: flex;
  gap: 4px;
}

.theme-menu-color {
  width: 20px;
  height: 20px;
  border-radius: 4px;
}

.theme-menu-info {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.theme-menu-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text);
}

.theme-menu-status {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.theme-menu-status.active {
  background: var(--success);
  color: white;
}

.theme-menu-status.locked {
  background: var(--grey-lighter);
  color: var(--text-secondary);
}

/* Hide old theme button */
.theme-button {
  display: none;
}

/* ===== Theme Modal ===== */
.theme-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5000;
  padding: var(--spacing-lg);
  animation: fadeIn 0.2s ease-out;
}

.theme-modal-content {
  background: var(--background);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.theme-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.theme-modal-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.theme-modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  transition: all var(--transition);
  border-radius: var(--radius-sm);
}

.theme-modal-close:hover {
  background: var(--grey-lighter);
  color: var(--text);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
}

.theme-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}

.theme-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.theme-card.active {
  border-color: var(--primary);
}

.theme-card.locked {
  opacity: 0.6;
}

.theme-preview {
  height: 80px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.theme-preview-accent {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 20px;
}

.theme-info {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.theme-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text);
}

.theme-status {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  font-weight: 500;
}

.theme-status.active {
  color: var(--primary);
}

.theme-status.locked {
  color: var(--text-light);
}

/* ===== Combo Meter ===== */
.combo-meter {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: translateX(-50%) scale(1); }
  50% { transform: translateX(-50%) scale(1.05); }
}

.combo-meter .combo-icon {
  font-size: 20px;
}

.combo-meter .combo-mult {
  background: rgba(255, 255, 255, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
}

/* ===== Combo Activation ===== */
.combo-activation {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  box-shadow: var(--shadow-lg);
  z-index: 3500;
  transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.combo-activation.show {
  transform: translate(-50%, -50%) scale(1);
}

.combo-activation .combo-icon {
  font-size: 48px;
}

.combo-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.combo-mult {
  font-size: var(--font-size-base);
  opacity: 0.9;
}

/* ===== Hint Button ===== */
.hint-button {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  margin: 0 var(--spacing-md) var(--spacing-sm);
  width: calc(100% - var(--spacing-md) * 2);
  min-height: 44px;
}

.hint-button:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

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

/* ===== Hints Accordion ===== */
.hints-accordion {
  margin: 0 var(--spacing-md) var(--spacing-sm);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface);
}

.hints-accordion-header {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--surface);
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text);
  transition: background 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.hints-accordion-header:hover {
  background: var(--grey-lighter);
}

.hints-accordion-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.hints-accordion-icon {
  transition: transform 0.3s;
  font-size: 12px;
  color: var(--text-secondary);
}

.hints-accordion.open .hints-accordion-icon {
  transform: rotate(180deg);
}

.hints-accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.hints-accordion.open .hints-accordion-content {
  max-height: 400px;
  overflow-y: auto;
}

.hint-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: 1px solid var(--border);
  font-size: var(--font-size-xs);
  line-height: 1.5;
  color: var(--text-secondary);
  background: white;
}

.hint-item:first-child {
  border-top: none;
}

.hint-item-number {
  display: inline-block;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  text-align: center;
  line-height: 20px;
  font-size: 11px;
  font-weight: 700;
  margin-right: var(--spacing-xs);
}

/* ===== Achievement Unlock Notification ===== */
.achievement-unlock {
  position: fixed;
  top: 80px;
  right: var(--spacing-lg);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-md);
  max-width: 350px;
  z-index: 4000;
  transform: translateX(400px);
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  border: 2px solid var(--primary);
}

.achievement-unlock.show {
  transform: translateX(0);
}

.achievement-unlock.fade-out {
  opacity: 0;
  transform: translateX(400px);
}

.achievement-icon {
  font-size: 40px;
  flex-shrink: 0;
}

.achievement-info {
  flex: 1;
}

.achievement-title {
  font-size: var(--font-size-xs);
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.achievement-name {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--spacing-xs);
}

.achievement-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.achievement-reward {
  font-size: var(--font-size-xs);
  color: var(--accent);
  font-weight: 600;
  margin-top: var(--spacing-xs);
}

@media (max-width: 767px) {
  .achievement-unlock {
    right: var(--spacing-md);
    left: var(--spacing-md);
    max-width: none;
  }
}

/* ===== End Screen ===== */
.end-screen-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 6000;
  padding: var(--spacing-lg);
  animation: fadeIn 0.3s ease-out;
}

.end-screen-content {
  background: var(--background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.end-screen-content h2 {
  font-size: var(--font-size-xxl);
  color: var(--text);
  margin-bottom: var(--spacing-xl);
  font-weight: 700;
}

.end-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: var(--spacing-2xl);
  gap: var(--spacing-lg);
}

.end-stat {
  flex: 1;
}

.stat-value {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

.missed-words {
  background: var(--surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xl);
}

.missed-words h3 {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.missed-words-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.missed-words-grid span {
  background: var(--grey-lighter);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text);
}

.show-all-missed-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.show-all-missed-btn:hover {
  background: var(--accent-dark);
}

.perfect-game {
  font-size: var(--font-size-xl);
  color: var(--success);
  font-weight: 700;
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.end-actions {
  display: flex;
  gap: var(--spacing-md);
}

.end-actions .btn {
  flex: 1;
}

/* ===== Footer ===== */
.game-footer {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.game-footer a {
  color: var(--primary);
  text-decoration: none;
  margin: 0 var(--spacing-md);
  font-weight: 600;
  transition: all var(--transition);
}

.game-footer a:hover {
  text-decoration: underline;
}

/* ===== Ad Containers ===== */
.ad-container {
  max-width: 728px;
  margin: var(--spacing-md) auto;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
  border-radius: var(--radius-md);
}

/* ===== Responsive Design ===== */
@media (min-width: 768px) {
  #game-container {
    padding: var(--spacing-xl);
  }

  .letter-grid {
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }

  .letter-tile {
    min-height: 100px;
  }

  .letter-tile .letter {
    font-size: 36px;
  }
}

/* ===== Tutorial & Onboarding ===== */

/* Tutorial overlay - Non-blocking banner at bottom */
.tutorial-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
  pointer-events: none;
  z-index: 2000;
  animation: fadeIn 0.2s ease-out;
}

.tutorial-overlay.fade-out {
  animation: fadeOut 0.2s ease-out forwards;
}

.tutorial-demo {
  position: fixed;
  bottom: var(--spacing-lg);
  left: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--text);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    transform: translateY(100px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.demo-instruction {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: white;
  margin-bottom: var(--spacing-xs);
}

.demo-skip {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.7);
  font-weight: 400;
}

@media (min-width: 768px) {
  .tutorial-demo {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    max-width: 400px;
  }

  .tutorial-overlay.fade-out .tutorial-demo {
    transform: translateX(-50%) translateY(100px);
  }
}

/* Demo highlight for letter tiles */
.letter-tile.demo-highlight {
  animation: demoHighlight 0.6s ease-out;
  box-shadow: 0 0 0 3px var(--accent);
}

@keyframes demoHighlight {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 3px var(--accent); }
  50% { transform: scale(1.08); box-shadow: 0 0 0 5px var(--accent); }
}

/* Demo pulse for submit button */
.btn.demo-pulse {
  animation: demoPulse 0.4s ease-out;
}

@keyframes demoPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

/* Contextual tips */
.tutorial-tip {
  position: fixed;
  bottom: var(--spacing-2xl);
  left: var(--spacing-md);
  right: var(--spacing-md);
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 1500;
  opacity: 0;
  transition: all var(--transition);
  border: 2px solid var(--border);
  transform: translateY(20px);
}

.tutorial-tip.show {
  opacity: 1;
  transform: translateY(0);
}

.tutorial-tip.fade-out {
  opacity: 0;
  transform: translateY(20px);
}

.tutorial-tip.success {
  border-color: var(--success);
  background: #f0fdf4;
}

.tutorial-tip.warning {
  border-color: var(--warning);
  background: #fffbeb;
}

.tutorial-tip.tip {
  border-color: var(--accent);
  background: #fefce8;
}

.tip-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.tip-message {
  flex: 1;
  color: var(--text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

.tip-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 18px;
  padding: var(--spacing-xs);
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.tip-close:hover {
  background: var(--grey-lighter);
  color: var(--text);
}

@media (min-width: 768px) {
  .tutorial-tip {
    left: 50%;
    right: auto;
    transform: translateX(-50%) translateY(20px);
    max-width: 400px;
  }

  .tutorial-tip.show {
    transform: translateX(-50%) translateY(0);
  }

  .tutorial-tip.fade-out {
    transform: translateX(-50%) translateY(20px);
  }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus indicators */
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #000000;
  }

  .letter-tile {
    border: 2px solid currentColor;
  }
}