:root {
  --color-bg: #f7f5f0;
  --color-surface: #ffffff;
  --color-text: #23252b;
  --color-muted: #62666f;
  --color-border: #dfdcd3;
  --color-primary: #1f6f5c;
  --color-primary-dark: #16513f;
  --color-primary-contrast: #ffffff;
  --color-accent: #e4572e;
  --color-solution: #ffe8a3;
  --color-found: #9fe0b6;
  --color-selecting: #bcdcf2;
  --radius: 10px;
  --max-width: 1080px;
  --font-sans: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

a {
  color: var(--color-primary-dark);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  padding: 1.1rem 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-primary-contrast);
}

.site-logo .logo-mark {
  font-size: 1.5rem;
}

.site-logo .logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-tagline {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.9;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-primary-contrast);
  text-decoration: none;
  font-size: 0.95rem;
  opacity: 0.9;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  opacity: 1;
  text-decoration: underline;
}

/* ---------- Breadcrumb ---------- */

.breadcrumb {
  max-width: var(--max-width);
  margin: 1rem auto 0;
  padding: 0 1.25rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb .sep {
  margin: 0 0.4rem;
}

/* ---------- Ad slots ---------- */

.ad-slot {
  max-width: var(--max-width);
  margin: 1.25rem auto;
  padding: 0.75rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

/* ---------- Hero / intro ---------- */

.hero {
  padding: 2rem 0 0.5rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  margin: 0 0 0.5rem;
}

.hero p {
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto;
}

.category-intro {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem auto 0;
  max-width: var(--max-width);
}

.category-intro h2 {
  margin-top: 0;
}

.category-facts {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.category-facts li {
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

/* ---------- How it works ---------- */

.how-it-works {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding: 0 1.25rem;
}

.how-it-works h2 {
  text-align: center;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
}

.step h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.step p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ---------- Category hub (Categories page) ---------- */

.category-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.category-hub-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.category-hub-card .icon {
  font-size: 1.75rem;
}

.category-hub-card h2 {
  margin: 0;
  font-size: 1.1rem;
}

.category-hub-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  flex: 1;
}

.category-hub-card a.btn {
  align-self: flex-start;
}

/* ---------- Content pages (About / Privacy / Contact) ---------- */

.content-page {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  max-width: var(--max-width);
  margin: 1.5rem auto 3rem;
  padding: 2rem;
}

.content-page h1 {
  margin-top: 0;
}

.content-page h2 {
  margin-top: 1.75rem;
}

.content-page p,
.content-page li {
  color: var(--color-text);
  line-height: 1.7;
}

.content-page ul,
.content-page ol {
  padding-left: 1.25rem;
}

.content-page .updated-date {
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ---------- Generator card ---------- */

.generator {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  max-width: var(--max-width);
  margin: 1.5rem auto;
  padding: 1.5rem;
}

.generator fieldset {
  border: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.generator legend {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
  padding: 0;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.6rem;
}

.option-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--color-text);
  text-align: left;
}

.option-btn .icon {
  font-size: 1.15rem;
}

.option-btn:hover {
  border-color: var(--color-primary);
}

.option-btn[aria-pressed="true"] {
  border-color: var(--color-primary);
  background: #eaf5f1;
  font-weight: 600;
}

.complexity-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.6rem;
}

.complexity-btn {
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  cursor: pointer;
  text-align: left;
}

.complexity-btn strong {
  display: block;
  font-size: 1rem;
}

.complexity-btn span {
  display: block;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.complexity-btn:hover {
  border-color: var(--color-primary);
}

.complexity-btn[aria-pressed="true"] {
  border-color: var(--color-primary);
  background: #eaf5f1;
}

.generate-row {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}

.btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

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

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
}

/* ---------- Puzzle ---------- */

.puzzle-section {
  max-width: var(--max-width);
  margin: 1.5rem auto 3rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.puzzle-section[hidden] {
  display: none;
}

.puzzle-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.puzzle-title h2 {
  margin: 0 0 0.15rem;
  font-size: 1.4rem;
}

.puzzle-meta {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.puzzle-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.puzzle-body {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(220px, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.grid-wrapper {
  overflow-x: auto;
}

.letter-grid {
  display: grid;
  border: 2px solid var(--color-text);
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 640px;
  margin: 0 auto;
  user-select: none;
  touch-action: none;
}

.letter-grid .cell {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #d8d5cc;
  font-weight: 600;
  font-family: "Courier New", monospace;
  aspect-ratio: 1 / 1;
  cursor: pointer;
}

.letter-grid .cell.selecting {
  background: var(--color-selecting);
}

.letter-grid .cell.revealed {
  background: var(--color-solution);
}

.letter-grid .cell.found {
  background: var(--color-found);
}

.puzzle-hint {
  margin: 0 0 1rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.puzzle-complete {
  background: var(--color-found);
  color: #16513f;
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  margin: 0 0 1rem;
  font-weight: 600;
  text-align: center;
}

.puzzle-complete[hidden] {
  display: none;
}

.word-list-panel h3 {
  margin-top: 0;
}

.word-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem 0.75rem;
}

.word-list li {
  font-family: "Courier New", monospace;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.15rem 0;
}

.word-list li.found {
  text-decoration: line-through;
  color: var(--color-muted);
}

.word-list li.revealed {
  color: var(--color-accent);
  font-style: italic;
}

/* ---------- Category link grid (homepage / footer) ---------- */

.category-links {
  max-width: var(--max-width);
  margin: 2rem auto;
}

.category-links h2 {
  text-align: center;
}

.category-link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.75rem;
}

.category-link-grid a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.9rem;
}

.category-link-grid a:hover {
  border-color: var(--color-primary);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0 2.5rem;
  color: var(--color-muted);
  font-size: 0.85rem;
  text-align: center;
}

.site-footer a {
  color: var(--color-muted);
}

.footer-nav {
  margin: 0 0 0.75rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer-nav a {
  text-decoration: none;
}

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

.footer-nav .sep {
  color: var(--color-border);
}

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  .puzzle-body {
    grid-template-columns: 1fr;
  }

  .word-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  .word-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .letter-grid .cell {
    font-size: 0.65rem;
  }

  .content-page {
    padding: 1.25rem;
  }
}

/* ---------- Print ---------- */

@media print {
  .site-header,
  .site-nav,
  .ad-slot,
  .generator,
  .site-footer,
  .puzzle-actions,
  .hero,
  .category-intro,
  .category-links,
  .puzzle-hint,
  .puzzle-complete {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .puzzle-section {
    border: none;
    box-shadow: none;
    margin: 0;
    padding: 0;
  }

  .puzzle-body {
    display: block;
  }

  .letter-grid {
    max-width: 100%;
    page-break-inside: avoid;
    border-color: #000;
  }

  .letter-grid .cell {
    border-color: #999;
    color: #000;
  }

  .letter-grid .cell.found,
  .letter-grid .cell.revealed,
  .letter-grid .cell.selecting {
    background: none;
  }

  .word-list-panel {
    margin-top: 1rem;
    page-break-inside: avoid;
  }

  .word-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .word-list li.found,
  .word-list li.revealed {
    text-decoration: none;
    font-style: normal;
    color: #000;
  }
}