/* Game Styles - ChainWhich */

/* ========================================
   GLOBAL
   ======================================== */

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-loose);
  color: var(--color-gray-900);
  background-color: var(--color-white);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========================================
   HEADER
   ======================================== */

.header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
  padding: 0 var(--container-padding);
}

.header__logo {
  display: flex;
  gap: 0.25rem;
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
  line-height: var(--line-height-tight);
}

.logo__word {
  padding: 0.25rem 0.5rem;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
  background: var(--color-white);
  color: var(--color-gray-900);
}

.header__menu {
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-700);
  font-size: 1.5rem;
  transition: color var(--duration-fast) var(--ease-out);
}

.header__menu:hover {
  color: var(--color-primary);
}

.header__menu:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

.header__info {
  display: flex;
  justify-content: center;
  align-items: center;
  height: var(--header-info-height);
  padding: 0 var(--container-padding);
  font-size: var(--font-size-headline);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-snug);
  color: var(--color-gray-900);
}

.streak {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.streak__label {
  font-size: var(--font-size-subhead);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  margin-right: var(--space-xs);
}

/* Tutorial header (replaces puzzle info during tutorial mode) */
.tutorial-header {
  text-align: center;
  font-size: var(--font-size-headline);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-snug);
  color: var(--color-gray-900);
}

.tutorial-header[hidden] {
  display: none !important;
}

.tutorial-header h2 {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

/* Daily header wrapper (same styling as header__info) */
.daily-header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
}

.daily-header[hidden] {
  display: none !important;
}

/* ========================================
   MENU
   ======================================== */

.menu {
  position: absolute;
  top: var(--header-height);
  right: 0;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-xs);
  margin: var(--space-xs) var(--container-padding);
  min-width: 200px;
  z-index: var(--z-menu);
}

.menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-body);
  text-align: left;
  color: var(--color-gray-900);
  border-radius: var(--border-radius-sm);
  transition: background-color var(--duration-fast) var(--ease-out);
  min-height: var(--touch-target-min);
}

.menu__item:hover {
  background-color: var(--color-gray-50);
}

.menu__item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.menu__icon {
  font-size: 1.25rem;
}

/* ========================================
   MAIN GAME AREA
   ======================================== */

.game {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-sm) var(--space-md);  /* 12px top/bottom, 16px left/right on mobile */
  gap: var(--space-md);  /* 16px on mobile */
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

/* ========================================
   TUTORIAL CAPTION
   ======================================== */

.tutorial-caption {
  text-align: center;
  padding: var(--space-md);
  background-color: var(--color-info-bg);
  border: 2px solid var(--color-info);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-body);
  color: var(--color-gray-700);
  margin-bottom: var(--space-md);
}

/* Respect the hidden attribute */
.tutorial-caption[hidden] {
  display: none !important;
}

.tutorial-caption p {
  margin: 0;
}

.tutorial-caption p + p {
  margin-top: var(--space-sm);
}

/* ========================================
   CHAIN AREA
   ======================================== */

.chain {
  flex-shrink: 0;
}

.chain__slots {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);  /* 12px on mobile */
}

.slot {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-height: var(--slot-height);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-white);
  border: var(--border-width) dashed var(--color-gray-300);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-word-slot);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  color: var(--color-gray-900);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
}

.slot__number {
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-400);
  flex-shrink: 0;
  width: 1.5rem;
}

.slot__content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);  /* Space between word and icon */
  min-height: 32px;
}

/* Slot States */
.slot--empty {
  border-style: dashed;
}

.slot--filled {
  border: var(--border-width) solid var(--color-primary);
  border-style: solid;
}

.slot--prefilled {
  background-color: var(--color-gray-50);
  border: var(--border-width) solid var(--color-gray-400);
  color: var(--color-gray-500);
  cursor: default;
}

.slot--prefilled::after {
  content: '🔒';
  margin-left: var(--space-xs);
  font-size: 0.875rem;
}

.slot--highlight {
  border: var(--border-width) solid var(--color-primary);
  box-shadow: var(--glow-primary);
  animation: pulse 2s var(--ease-in-out) infinite;
}

.slot--correct {
  background-color: var(--color-success-bg);
  border: var(--border-width) solid var(--color-success);
}

.slot--wrong {
  background-color: var(--color-error-bg);
  border: var(--border-width) solid var(--color-error);
  /* Shake animation removed per ux-steve spec - color + icon is sufficient feedback */
  transition: all var(--duration-normal) var(--ease-out);
}

.slot--decoy {
  background-color: var(--color-gray-100);
  border: var(--border-width) solid var(--color-gray-500);
  color: var(--color-gray-400);
  text-decoration: line-through;
  opacity: 0.6;
}

/* Locked slot (revealed by second hint) */
.slot--locked {
  background-color: var(--color-info-bg);
  border: var(--border-width) solid var(--color-info);
  cursor: not-allowed;
  pointer-events: none;
  position: relative;
}

.slot--locked .slot__content::after {
  content: '🔒';
  margin-left: var(--space-xs);
  font-size: 1rem;
  opacity: 0.8;
}

/* Icon styling - visible to all users for WCAG 2.1 AA compliance */
.slot--correct .slot__icon,
.slot--wrong .slot__icon {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  animation: scaleIn var(--duration-medium) var(--ease-bounce);
}

.slot--correct .slot__icon {
  color: var(--color-success);
}

.slot--wrong .slot__icon {
  color: var(--color-error);
}

/* Focus Styles */
.slot:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   STATUS BAR
   ======================================== */

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--status-bar-height);
  font-size: var(--font-size-subhead);
  font-weight: var(--font-weight-regular);
  color: var(--color-gray-500);
}

.status-bar__attempts {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.attempts-circles {
  display: flex;
  gap: var(--space-xs);
}

.circle {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--color-gray-300);
  transition: background-color var(--duration-fast) var(--ease-out);
}

.circle.filled {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.status-bar__hint {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-regular);
  color: var(--color-gray-500);
  background: transparent;
  border: none;
  padding: var(--space-xs);
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.status-bar__hint:hover {
  color: var(--color-primary);
}

.status-bar__hint:active {
  transform: scale(0.96);
}

.status-bar__hint:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

.status-bar__hint:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status-bar__hint[hidden] {
  display: none;
}

.status-bar__timer {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-variant-numeric: tabular-nums;
}

/* ========================================
   WORD BANK
   ======================================== */

.word-bank {
  flex: 1;
  overflow-y: auto;
}

.word-bank__container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-sm);
}

.word {
  min-height: var(--touch-target-min);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-gray-200);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-word-bank);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-gray-900);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-fast) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
}

.word:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.word--selected {
  background-color: var(--color-teal-50);
  border-color: var(--color-primary);
  box-shadow: var(--glow-primary);
  transform: scale(1.05);
}

.word--used {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-200);
  color: var(--color-gray-400);
  opacity: 0.5;
  pointer-events: none;
}

/* Eliminated word (removed by first hint) */
.word--eliminated {
  /* Text styling */
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--color-gray-400);  /* Neutral gray */

  /* Opacity */
  opacity: 0.4;

  /* Interaction */
  pointer-events: none;
  cursor: not-allowed;

  /* Background */
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-300);
}

.word:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Loading and Error States */
.loading-state,
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  min-height: 200px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-md);
}

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

.loading-message {
  font-size: var(--font-size-body);
  color: var(--color-gray-600);
  font-weight: var(--font-weight-medium);
}

.error-state {
  background-color: var(--color-gray-50);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-gray-200);
}

.error-icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.error-message {
  font-size: var(--font-size-body);
  color: var(--color-gray-700);
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-medium);
}

.error-fallback {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  font-style: italic;
}

/* ========================================
   SUBMIT BUTTON
   ======================================== */

.submit-button {
  position: sticky;
  bottom: var(--space-md);
  width: 100%;
  min-height: var(--slot-height);
  padding: var(--space-md);
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wide);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
}

.submit-button:not(:disabled):hover {
  background-color: var(--color-primary-hover);
}

.submit-button:not(:disabled):active {
  transform: scale(0.96);
}

.submit-button:disabled {
  background-color: var(--color-gray-200);
  color: var(--color-gray-400);
  border: 1px solid var(--color-gray-300);
  box-shadow: none;
  cursor: not-allowed;
  opacity: 1;
}

.submit-button:not(:disabled) {
  animation: pulse 2s var(--ease-in-out) infinite;
}

.submit-button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.submit-button--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.submit-button--loading::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  top: 50%;
  left: 50%;
  margin-left: -10px;
  margin-top: -10px;
  border: 3px solid var(--color-white);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 800ms linear infinite;
}

/* ========================================
   MODALS
   ======================================== */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

/* Respect the hidden attribute - prevent CSS display override */
.modal[hidden] {
  display: none !important;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: var(--z-modal-backdrop);
}

.modal__content {
  position: relative;
  z-index: var(--z-modal);
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn var(--duration-medium) var(--ease-out);
}

.modal__header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  font-size: var(--font-size-headline);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.modal__close {
  width: var(--touch-target-min);  /* 48px - WCAG 2.1 AA compliant */
  height: var(--touch-target-min); /* 48px */
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-500);
  font-size: 1.5rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.modal__close:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
}

.modal__close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.modal__body {
  padding: var(--space-lg);
  font-size: var(--font-size-body);
  color: var(--color-gray-700);
  line-height: var(--line-height-loose);
}

.modal__body ul {
  list-style: disc;
  padding-left: var(--space-lg);
  margin-top: var(--space-sm);
}

.modal__body li {
  margin-top: var(--space-xs);
}

.modal__actions {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

/* ========================================
   STATS
   ======================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.stat {
  text-align: center;
  padding: var(--space-md);
  background-color: var(--color-gray-50);
  border-radius: var(--border-radius-md);
}

.stat__value {
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: var(--line-height-tight);
}

.stat__label {
  font-size: var(--font-size-caption);
  color: var(--color-gray-500);
  margin-top: var(--space-xs);
}

/* ========================================
   SETTINGS
   ======================================== */

.settings-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background-color: var(--color-gray-50);
  border-radius: var(--border-radius-md);
}

.setting-item label {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-900);
}

.toggle {
  width: 48px;
  height: 24px;
  appearance: none;
  background-color: var(--color-gray-300);
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.toggle::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-white);
  top: 2px;
  left: 2px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.toggle:checked {
  background-color: var(--color-primary);
}

.toggle:checked::before {
  transform: translateX(24px);
}

.toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   BUTTONS
   ======================================== */

.button {
  min-height: var(--touch-target-min);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.button--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.button--primary:hover {
  background-color: var(--color-primary-hover);
}

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

.button--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: var(--border-width) solid var(--color-primary);
}

.button--secondary:hover {
  background-color: var(--color-teal-50);
}

.button--secondary:active {
  transform: scale(0.96);
}

.button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
  20%, 40%, 60%, 80% { transform: translateX(8px); }
}

@keyframes scaleIn {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes modalSlideIn {
  0% {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

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

/* ========================================
   RESPONSIVE BREAKPOINTS
   ======================================== */

@media (min-width: 768px) {
  .game {
    padding: var(--space-md);  /* 16px all sides on tablet+ */
    gap: var(--space-lg);  /* 24px on tablet+ */
  }

  .chain__slots {
    gap: var(--space-md);  /* 16px on tablet+ */
  }
}

/* ========================================
   UTILITIES
   ======================================== */

.hidden {
  display: none !important;
}

/* Skip Tutorial Link */
.skip-tutorial {
  display: block;
  text-align: center;
  margin-top: var(--space-md);
  font-size: var(--font-size-micro);
  color: var(--color-gray-500);
  text-decoration: underline;
  cursor: pointer;
}

.skip-tutorial:hover {
  color: var(--color-primary);
}