/**
 * Site-Specific Custom Styles (Layer 5)
 * =====================================
 *
 * Layout: masonry
 *
 * This is the 5th and final layer in the CSS cascade:
 *
 * 1. main.css           → Platform base (header, footer, buttons)
 * 2. base-structure.css → Page layout (grids, sections, cards)
 * 3. tokens.css         → Design tokens (colors, spacing, typography)
 * 4. skin.css           → Theme skin (gradients, shadows, effects)
 * 5. site.css           → Site-specific customization (THIS FILE)
 *
 * Site 015: Logic Puzzle
 * Primary: #3b82f6  Accent: #8b5cf6
 * All interactive components use CSS variables from tokens.css.
 */

/* ==========================================================
   LAYOUT: Masonry — Pinterest-Style Gallery
   ==========================================================
   Visual: Categories flow like a waterfall/Pinterest board.
   ========================================================== */

/* ── Homepage: Hero Section ── */
.hero {
  border-bottom: none;
  border-radius: 0 0 24px 24px;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  letter-spacing: -0.03em;
}

/* ── Homepage: Categories — CSS Columns Masonry ── */
.categories-grid {
  display: block;
  column-count: 3;
  column-gap: 1.75rem;
}

.category-card {
  break-inside: avoid;
  margin-bottom: 1.75rem;
  display: block;
}

/* Variable heights through padding variation */
.category-card:nth-child(3n)   { padding: 2.5rem 2rem; }
.category-card:nth-child(3n+1) { padding: 1.75rem 2rem 2.25rem; }
.category-card:nth-child(3n+2) { padding: 2rem; }

/* ── Category meta — reveal on hover ── */
.category-meta {
  border-top: none;
  padding-top: 0.75rem;
  margin-top: 0.75rem;
  opacity: 0;
  transition: opacity var(--dur-fast, 150ms) ease;
}

.category-card:hover .category-meta {
  opacity: 1;
}

/* ── Homepage: Intro Section ── */
.intro-section {
  border-radius: 16px;
  text-align: center;
}

/* ── List Page: Subcategories — 2-Column Masonry ── */
.subcategories {
  column-count: 2;
  column-gap: 1.5rem;
}

.category-list {
  display: block;
  list-style: none;
  padding: 0;
}

.category-list li {
  break-inside: avoid;
  margin-bottom: 1rem;
}

.category-list li a {
  border-radius: var(--radius-lg, 12px);
}

/* ── List Page: Worksheets — Compact Pills ── */
.worksheet-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
}

.worksheet-list li a {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border: 1.5px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-full, 9999px);
  text-decoration: none;
  color: var(--site-text, #0f172a);
  font-weight: 500;
  font-size: 0.9rem;
  transition: border-color var(--dur-fast, 150ms) ease,
              background var(--dur-fast, 150ms) ease;
}

.worksheet-list li a:hover {
  border-color: var(--site-primary, #3b82f6);
  background: var(--site-primary-light, #eff6ff);
  color: var(--site-primary-hover, #2563eb);
}

/* ── SEO Components — Tight 2-Column ── */
.seo-components--primary {
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.seo-card { border-radius: 14px; }

.seo-more-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .categories-grid { column-count: 2; }
  .seo-more-grid   { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .categories-grid          { column-count: 1; }
  .subcategories            { column-count: 1; }
  .seo-components--primary  { grid-template-columns: 1fr; }
  .seo-more-grid            { grid-template-columns: 1fr; }
}

/* ============================================
   LOGIC PUZZLE — INTERACTIVE COMPONENTS
   All tokens reference vars from tokens.css
   ============================================ */

/* ── Puzzle Grid Cell ─────────────────────────── */
.lp-cell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 40px;
  font-family: var(--font-mono, monospace);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--site-border-medium, #cbd5e1);
  background: var(--site-background, #ffffff);
  cursor: pointer;
  transition: background var(--dur-fast, 150ms) ease,
              border-color var(--dur-fast, 150ms) ease;
}

.lp-cell:hover {
  background: var(--site-primary-light, #eff6ff);
  border-color: var(--site-primary-border, #bfdbfe);
}

.lp-cell.is-focused {
  outline: 2px solid var(--site-primary, #3b82f6);
  outline-offset: -2px;
  background: rgba(59, 130, 246, 0.08);
}

.lp-cell.is-given {
  font-weight: 700;
  background: var(--site-surface, #f8fafc);
  color: var(--site-text, #0f172a);
  cursor: default;
}

/* Check / X marks — semantic colors, not brand colors */
.lp-cell.is-correct {
  background: var(--color-success-light, #f0fdf4);
  color: var(--color-success-text, #166534);
  border-color: var(--color-success, #22c55e);
}

.lp-cell.is-wrong {
  background: var(--color-error-light, #fef2f2);
  color: var(--color-error-text, #991b1b);
  border-color: var(--color-error, #ef4444);
}

.lp-cell.is-candidate {
  font-size: 0.6rem;
  line-height: 1.1;
  color: var(--site-text-muted, #64748b);
  padding: 2px;
}

.lp-cell:focus-visible {
  outline: 2px solid var(--site-primary, #3b82f6);
  outline-offset: 2px;
}

/* ── Logic Grid Table — clean white cells, precise borders ── */
.logic-grid-table {
  border-collapse: collapse;
  background: var(--site-background, #ffffff);
  font-family: var(--font-mono, monospace);
}

.logic-grid-table th,
.logic-grid-table td {
  border: 1px solid var(--site-border-medium, #cbd5e1);
  padding: 0;
  text-align: center;
  min-width: 40px;
  min-height: 40px;
}

/* Thick outer border for classic logic grid look */
.logic-grid-table {
  border: 2px solid var(--site-text, #0f172a);
}

/* Group dividers — heavier lines between categories */
.logic-grid-table .group-border-right  { border-right: 2px solid var(--site-text, #0f172a); }
.logic-grid-table .group-border-bottom { border-bottom: 2px solid var(--site-text, #0f172a); }

/* Header cells */
.logic-grid-table th {
  background: var(--site-surface, #f8fafc);
  font-family: var(--font-heading, 'DM Sans', system-ui, sans-serif);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--site-text-light, #475569);
  padding: 0.5rem 0.4rem;
  letter-spacing: 0.02em;
}

/* Cell marks */
.lp-mark-check {
  color: var(--color-success, #22c55e);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
}

.lp-mark-cross {
  color: var(--color-error, #ef4444);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
}

/* ── Puzzle Type Tabs ─────────────────────────── */
.lp-type-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 1rem;
  padding: 0.3rem;
  background: var(--site-surface, #f8fafc);
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-md, 8px);
}

.lp-type-tab {
  padding: 0.4rem 0.875rem;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm, 4px);
  background: transparent;
  color: var(--site-text-muted, #64748b);
  cursor: pointer;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: background var(--dur-fast, 150ms) ease,
              color var(--dur-fast, 150ms) ease;
}

.lp-type-tab:hover {
  background: var(--site-primary-light, #eff6ff);
  color: var(--site-primary-hover, #2563eb);
}

.lp-type-tab.is-active {
  background: var(--site-primary, #3b82f6);
  color: var(--site-text-inverse, #ffffff);
  box-shadow: var(--shadow-sm);
}

/* ── Clue Section ─────────────────────────────── */
.lp-clues {
  background: var(--site-background, #ffffff);
  border: 1px solid var(--site-primary-border, #bfdbfe);
  border-radius: var(--radius-lg, 12px);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.lp-clues__title {
  font-family: var(--font-heading, 'DM Sans', system-ui, sans-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--site-primary-dark, #1e3a8a);
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.lp-clues__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lp-clues__item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  padding: 0.625rem 0.875rem;
  background: var(--site-surface, #f8fafc);
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-sm, 4px);
  font-size: 0.9rem;
  color: var(--site-text, #0f172a);
  line-height: 1.5;
  transition: background var(--dur-fast, 150ms) ease,
              border-color var(--dur-fast, 150ms) ease;
}

.lp-clues__item:hover {
  background: var(--site-primary-light, #eff6ff);
  border-color: var(--site-primary-border, #bfdbfe);
}

.lp-clues__item.is-used {
  opacity: 0.45;
  text-decoration: line-through;
}

.lp-clue-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5rem;
  height: 1.5rem;
  background: var(--site-primary, #3b82f6);
  color: var(--site-text-inverse, #ffffff);
  border-radius: var(--radius-full, 9999px);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-heading);
  flex-shrink: 0;
}

/* ── Rule Card ────────────────────────────────── */
.lp-rule-card {
  padding: 0.875rem 1.125rem;
  background: var(--site-primary-light, #eff6ff);
  border: 1px solid var(--site-primary-border, #bfdbfe);
  border-radius: var(--radius-md, 8px);
  margin-bottom: 1rem;
}

.lp-rule-card__title {
  font-family: var(--font-heading, 'DM Sans', system-ui, sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--site-primary-dark, #1e3a8a);
  margin-bottom: 0.4rem;
}

.lp-rule-card__text {
  font-size: 0.875rem;
  color: var(--site-text, #0f172a);
  line-height: 1.55;
}

.lp-rule-card__example {
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--site-background, #ffffff);
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-sm, 4px);
  font-family: var(--font-mono, monospace);
  font-size: 0.8rem;
  color: var(--site-text-muted, #64748b);
}

/* ── Candidate Marking Toolbar ────────────────── */
.lp-candidate-toolbar {
  display: flex;
  gap: 0.3rem;
  padding: 0.4rem;
  background: var(--site-surface, #f8fafc);
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-md, 8px);
  margin-bottom: 0.75rem;
}

.lp-candidate-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono, monospace);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--site-border-medium, #cbd5e1);
  border-radius: var(--radius-sm, 4px);
  background: var(--site-background, #ffffff);
  color: var(--site-text, #0f172a);
  cursor: pointer;
  transition: border-color var(--dur-fast, 150ms) ease,
              background var(--dur-fast, 150ms) ease;
}

.lp-candidate-btn:hover {
  border-color: var(--site-primary, #3b82f6);
  background: var(--site-primary-light, #eff6ff);
}

.lp-candidate-btn.is-active {
  border-color: var(--site-primary, #3b82f6);
  background: rgba(59, 130, 246, 0.1);
  color: var(--site-primary, #3b82f6);
}

/* ── Undo/Redo Bar ────────────────────────────── */
.lp-undo-bar {
  display: flex;
  gap: 0.3rem;
  align-items: center;
}

.lp-undo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 1.1rem;
  border: 1px solid var(--site-border-medium, #cbd5e1);
  border-radius: var(--radius-sm, 4px);
  background: var(--site-background, #ffffff);
  color: var(--site-text-muted, #64748b);
  cursor: pointer;
  transition: color var(--dur-fast, 150ms) ease,
              background var(--dur-fast, 150ms) ease;
}

.lp-undo-btn:hover {
  color: var(--site-text, #0f172a);
  background: var(--site-primary-light, #eff6ff);
}

.lp-undo-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

/* ── Difficulty Rating — Violet accent ─────────── */
.lp-difficulty {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.lp-difficulty__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--site-border-medium, #cbd5e1);
  transition: background var(--dur-fast, 150ms) ease;
}

.lp-difficulty__dot.is-filled {
  background: var(--site-accent, #8b5cf6);
}

.lp-difficulty__label {
  margin-left: 0.375rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--site-accent, #8b5cf6);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Difficulty star variant */
.lp-difficulty__star {
  font-size: 0.9rem;
  color: var(--site-border-medium, #cbd5e1);
}

.lp-difficulty__star.is-filled {
  color: var(--site-accent, #8b5cf6);
}

/* ── Hint Budget ──────────────────────────────── */
.lp-hint-budget {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-sm, 4px);
  background: var(--site-background, #ffffff);
  color: var(--site-text-muted, #64748b);
}

.lp-hint-budget__dots {
  display: flex;
  gap: 3px;
}

.lp-hint-budget__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--site-primary, #3b82f6);
}

.lp-hint-budget__dot.is-used {
  background: var(--site-border-medium, #cbd5e1);
}

/* ── Daily Challenge Entry ────────────────────── */
.lp-daily {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, var(--site-primary, #3b82f6) 0%, var(--site-accent, #8b5cf6) 100%);
  color: var(--site-text-inverse, #ffffff);
  border-radius: var(--radius-lg, 12px);
  margin-bottom: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: opacity var(--dur-fast, 150ms) ease,
              transform var(--dur-fast, 150ms) ease;
}

.lp-daily:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.lp-daily__icon { font-size: 1.5rem; }

.lp-daily__text {
  flex: 1;
  font-family: var(--font-heading, 'DM Sans', system-ui, sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
}

.lp-daily__type {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.625rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full, 9999px);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Progress per Puzzle Type ─────────────────── */
.lp-progress-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.lp-progress-card {
  padding: 0.625rem 0.875rem;
  background: var(--site-surface, #f8fafc);
  border: 1px solid var(--site-border, #e2e8f0);
  border-radius: var(--radius-md, 8px);
}

.lp-progress-card__name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--site-text-muted, #64748b);
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.lp-progress-card__bar {
  height: 5px;
  background: var(--site-border, #e2e8f0);
  border-radius: var(--radius-full, 9999px);
  overflow: hidden;
}

.lp-progress-card__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--site-primary, #3b82f6), var(--site-accent, #8b5cf6));
  border-radius: var(--radius-full, 9999px);
  transition: width var(--dur-slow, 400ms) var(--ease-std, cubic-bezier(0.4, 0, 0.2, 1));
}

/* ── Puzzle Completion Banner ─────────────────── */
.lp-complete {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 2rem;
  background: linear-gradient(135deg, var(--site-primary-light, #eff6ff) 0%, var(--site-accent-light, #f5f3ff) 100%);
  border: 1px solid var(--site-primary-border, #bfdbfe);
  border-radius: var(--radius-xl, 16px);
  text-align: center;
  animation: fadeInUp 400ms var(--ease-std, cubic-bezier(0.4, 0, 0.2, 1)) both;
}

.lp-complete__icon {
  font-size: 3rem;
  line-height: 1;
}

.lp-complete__title {
  font-family: var(--font-heading, 'DM Sans', system-ui, sans-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--site-primary-dark, #1e3a8a);
  letter-spacing: -0.02em;
}

.lp-complete__subtitle {
  font-size: 0.95rem;
  color: var(--site-text-muted, #64748b);
}

/* ── Print Suppression for Interactive UI ────── */
@media print {
  .lp-type-tabs,
  .lp-candidate-toolbar,
  .lp-undo-bar,
  .lp-hint-budget,
  .lp-daily,
  .lp-progress-grid,
  .lp-rule-card,
  .lp-difficulty,
  .lp-complete { display: none !important; }

  .lp-cell.is-focused { outline: none; background: #fff; }

  .logic-grid-table th,
  .logic-grid-table td { border: 0.75pt solid #999; }

  .logic-grid-table {
    border: 2pt solid #000;
  }

  .lp-clues__item { background: #fff; border: 0.5pt solid #ccc; }
}