/* Sandbox Page — Centered list + detail layout
 * Literary aesthetic: serif titles, warm cream palette, minimal chrome
 */

/* ============================================================================
 * Variables (override design-system where needed)
 * ============================================================================ */

:root {
  --bg-page: var(--color-background, #f5f0ea);
  --bg-card: var(--color-surface-alt, #faf7f3);
  --bg-panel: var(--color-surface-alt, #faf7f3);
  --text-primary: var(--color-text-primary, #3a342d);
  --text-secondary: var(--color-text-secondary, #7a7168);
  --text-muted: var(--color-text-muted, #a89e93);
  --border-light: var(--color-border, #ddd5ca);
  --border-medium: var(--color-border-hover, #c4bab0);
  --accent-teal: var(--color-primary, #3d8f80);
  --accent-teal-dark: var(--color-primary-hover, #347a6d);
}

/* ============================================================================
 * Page Layout
 * ============================================================================ */

.sandbox-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  color: var(--text-primary);
  background-color: var(--bg-page);
}

.page-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.page-spacer {
  flex: 1;
  min-height: 40px;
}

/* ============================================================================
 * Header
 * ============================================================================ */

.sandbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-light);
  height: 56px;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: inherit;
}

.logo-prompt {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-teal);
}

.logo-text {
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

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

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sign-in-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  background-color: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.sign-in-btn:hover {
  background-color: var(--color-surface-alt, #faf7f3);
  border-color: var(--text-muted);
}

.sign-in-btn.signed-in {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

/* User dropdown menu */
.user-menu-container {
  position: relative;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 140px;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(58, 52, 45, 0.1);
  z-index: 100;
  overflow: hidden;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.1s ease;
}

.dropdown-item:hover {
  background-color: var(--bg-page);
  color: var(--text-primary);
}

/* ============================================================================
 * Room Description (narrative flavor text)
 * ============================================================================ */

.room-description {
  font-style: italic;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-muted);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.room-description p {
  margin: 0;
}

/* ============================================================================
 * Filter Config (left column, above puzzle list)
 * ============================================================================ */

.puzzle-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-content: start;
}

.filter-config {
  display: flex;
  align-items: baseline;
  gap: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.filter-prompt {
  color: var(--accent-teal);
  margin-right: 6px;
  font-weight: 600;
}

.filter-key {
  color: var(--text-muted);
  margin-right: 4px;
}

.filter-value {
  font-family: inherit;
  font-size: inherit;
  color: var(--text-primary);
  background: none;
  border: none;
  border-bottom: 1px dashed var(--text-muted);
  padding: 0;
  cursor: pointer;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.filter-value:hover {
  color: var(--accent-teal);
  border-bottom-color: var(--accent-teal);
}

.filter-select {
  border-radius: 0;
  height: auto;
  border-bottom: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.filter-pipe {
  margin: 0 8px;
  color: var(--text-muted);
  opacity: 0.5;
}

.filter-cursor {
  margin-left: 6px;
  color: var(--accent-teal);
  animation: cursor-pulse 1.2s step-end infinite;
}

@keyframes cursor-pulse {
  0%, 50% { opacity: 1; }
  55%, 95% { opacity: 0; }
  100% { opacity: 1; }
}

/* ============================================================================
 * Main Content — List + Detail
 * ============================================================================ */

.main-content {
  max-width: 1140px;
  margin: 0 auto;
  padding: 40px 24px 32px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 36px;
  width: 100%;
}

/* ============================================================================
 * Puzzle List (left column)
 * ============================================================================ */

.puzzle-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-content: start;
}

.puzzle-loading,
.no-puzzles {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  color: var(--text-muted);
  gap: 16px;
  grid-column: 1 / -1;
}

.puzzle-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s ease;
  border: none;
  background: none;
  text-align: left;
  width: 100%;
  position: relative;
}

.puzzle-list-item:hover {
  background-color: var(--color-surface-hover, #e8e1d8);
}

.puzzle-list-item:focus {
  outline: none;
}

.puzzle-list-item.selected {
  background-color: var(--color-surface, #f0ebe3);
}

.puzzle-list-item.selected::before {
  content: '\203A';
  position: absolute;
  left: 2px;
  font-size: 18px;
  font-weight: 600;
  color: var(--accent-teal);
  line-height: 1;
}

.puzzle-list-item.solved {
  opacity: 0.6;
}

.puzzle-list-item:focus-visible {
  outline: 2px solid var(--accent-teal);
  outline-offset: -2px;
}

.item-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  background-color: var(--text-muted);
}

.item-indicator.solved {
  background-color: var(--accent-teal);
}

.item-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.item-title {
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
}

.item-subtitle {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* ============================================================================
 * Detail Card (right column)
 * ============================================================================ */

.detail-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-self: start;
}

.detail-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 0;
  color: var(--text-muted);
  text-align: center;
  gap: 12px;
}

.detail-placeholder p {
  margin: 0;
  font-size: 14px;
}

.keyboard-hint {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 12px;
  color: var(--text-muted);
}

.keyboard-hint kbd {
  display: inline-block;
  padding: 2px 6px;
  margin: 0 2px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  background-color: var(--color-surface, #f0ebe3);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
}

/* Detail content layout */
.detail-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.detail-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 13px;
  color: var(--text-muted);
}

.detail-meta-row .difficulty-label {
  font-weight: 500;
}

.detail-meta-row .meta-separator {
  color: var(--border-medium);
}

.detail-title {
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
}

.detail-flavor {
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-style: italic;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.detail-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Systems tags */
.detail-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.detail-section-title {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.systems-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.system-tag {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 12px;
  padding: 4px 10px;
  background-color: var(--color-surface, #f0ebe3);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text-secondary);
}

.system-tag.highlight {
  background-color: var(--color-warning, #B8973D);
  color: white;
  border-color: var(--color-warning, #B8973D);
}

/* Available data */
.available-data {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.data-tag {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 12px;
  padding: 4px 10px;
  background-color: var(--color-surface, #f0ebe3);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text-secondary);
}

.data-tag.inactive {
  opacity: 0.4;
}

/* Solved banner */
.solved-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background-color: var(--color-success-bg, #E2EDE8);
  border: 1px solid var(--color-success, #5A8A72);
  border-radius: 6px;
  color: var(--color-success-text, #2D4A3C);
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 13px;
  font-weight: 500;
}

.solved-banner i {
  color: var(--color-success, #5A8A72);
}

/* Begin button */
.begin-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  background-color: var(--accent-teal);
  color: white;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease;
  align-self: flex-start;
}

.begin-btn:hover {
  background-color: var(--accent-teal-dark);
}

.begin-btn:disabled {
  background-color: var(--border-medium);
  cursor: not-allowed;
}

.begin-btn .kbd {
  font-size: 14px;
  opacity: 0.6;
  margin-left: 4px;
}

/* ============================================================================
 * Page Footer
 * ============================================================================ */

.page-footer {
  max-width: 1140px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 24px 32px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.footer-save {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.footer-save label {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.footer-save input[type="email"] {
  padding: 6px 10px;
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 13px;
  color: var(--text-primary);
  background-color: var(--color-surface-alt, #faf7f3);
  width: 180px;
}

.footer-save input[type="email"]:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 2px rgba(61, 143, 128, 0.15);
}

.footer-save-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  background: none;
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.footer-save-btn:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.footer-save-btn:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
}

/* ============================================================================
 * Modal
 * ============================================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(58, 52, 45, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background-color: var(--bg-panel);
  border-radius: 12px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 40px rgba(58, 52, 45, 0.15);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
}

.modal-header h2 {
  margin: 0;
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  padding: 4px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
}

.modal-close:hover {
  background-color: var(--color-surface, #f0ebe3);
  color: var(--text-secondary);
}

.modal-body {
  padding: 24px;
}

.modal-body p {
  margin: 0 0 16px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.modal-body form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-body input[type="email"] {
  padding: 12px 14px;
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 15px;
  color: var(--text-primary);
  background-color: var(--color-surface-alt, #faf7f3);
}

.modal-body input[type="email"]:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px rgba(61, 143, 128, 0.15);
}

.sign-in-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  background-color: var(--accent-teal);
  color: white;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}

.sign-in-submit:hover {
  background-color: var(--accent-teal-dark);
}

.sign-in-submit:disabled {
  background-color: var(--border-medium);
  cursor: not-allowed;
}

/* Mailing list consent */
.consent-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.consent-label input[type="checkbox"] {
  accent-color: var(--accent-teal);
  width: 16px;
  height: 16px;
  margin: 0;
  cursor: pointer;
}

/* Email sent state */
.email-sent-state {
  text-align: center;
}

.email-sent-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent-teal);
}

.email-sent-title {
  font-family: var(--font-family-serif, 'Source Serif 4', Georgia, serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px 0;
}

.email-sent-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 4px 0;
}

.email-sent-address {
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0 0 16px 0;
  word-break: break-all;
}

.email-sent-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 20px 0;
  line-height: 1.5;
}

.resend-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  background-color: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 140px;
}

.resend-btn:hover:not(:disabled) {
  background-color: var(--color-surface, #f0ebe3);
  border-color: var(--text-muted);
}

.resend-btn:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
}

.resend-btn .spinner {
  width: 14px;
  height: 14px;
}

/* ============================================================================
 * Error Message
 * ============================================================================ */

.error-message {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background-color: var(--color-error-bg, #F5E5E5);
  border: 1px solid var(--color-error, #B85C5C);
  border-radius: 8px;
  color: var(--color-error-text, #6B2D2D);
  font-family: var(--font-family-ui, 'DM Sans', sans-serif);
  font-size: 14px;
  z-index: 200;
  box-shadow: 0 4px 12px rgba(58, 52, 45, 0.1);
}

.error-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ============================================================================
 * Spinner
 * ============================================================================ */

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-medium);
  border-top-color: var(--accent-teal);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ============================================================================
 * Responsive — Tablet (stack to single column)
 * ============================================================================ */

@media (max-width: 768px) {
  .sandbox-header {
    padding: 12px 16px;
  }

  .header-center {
    display: none;
  }

  .main-content {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 16px;
  }

  .puzzle-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
  }

  .detail-card {
    padding: 24px;
  }

  .page-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 16px 48px;
  }

  .footer-save input[type="email"] {
    width: 160px;
  }

  .modal {
    margin: 16px;
    max-width: calc(100% - 32px);
  }
}

/* ============================================================================
 * Responsive — Small mobile
 * ============================================================================ */

@media (max-width: 480px) {
  .puzzle-list {
    grid-template-columns: 1fr;
  }

  .detail-card {
    padding: 20px;
  }
}

/* ============================================================================
 * Reduced Motion
 * ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}