/* ============================================================
   Shared theme — Engaging Starters
   Every page in this site links to this file. Page-specific
   styles (the puzzle panel, the homepage's card grid, etc.)
   stay in that page's own <style> block below this link.
   ============================================================ */

:root{
  /* foundation */
  --ink: #241b18;
  --ink-soft: #6f6159;
  --ground: #fff8f3;
  --paper: #fffefb;
  --card: #ffffff;
  --paper-line: #ece1d3;
  --line: rgba(36,27,24,0.10);

  /* brand */
  --brand: #ff4b3e;
  --brand-dark: #c22e23;

  /* subject accents */
  --maths: #2f6fed;
  --maths-dark: #1b3e85;
  --science: #1fa679;
  --science-dark: #146349;
  --english: #c23b7a;
  --english-dark: #7a2450;
  --humanities: #e8912b;
  --humanities-dark: #a85f10;

  /* legacy tokens, aliased so every page recolors from here */
  --chalkboard: var(--ink);
  --chalkboard-dark: var(--ink);
  --chalk-white: var(--ink);
  --chalk-dim: var(--ink-soft);
  --easy: var(--science);
  --easy-dark: var(--science-dark);
  --medium: var(--humanities);
  --medium-dark: var(--humanities-dark);
  --hard: var(--brand);
  --hard-dark: var(--brand-dark);
  --gold: #d6a01a;
  --gold-dark: #96700f;
  --p1: var(--maths);
  --p1-dark: var(--maths-dark);
  --p2: var(--humanities);
  --p2-dark: var(--humanities-dark);
  --wood: var(--ink);
  --focus: var(--maths);
  --pin: var(--brand);
  --pin-dark: var(--brand-dark);

  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: 'Karla', system-ui, sans-serif;
  min-height: 100vh;
}

body {
  padding: 28px 16px 60px;
}

a { color: inherit; }

.board {
  max-width: 640px;
  margin: 0 auto;
  padding: 12px 4px 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  margin-bottom: 8px;
  transition: color 0.15s ease;
}
.back-link:hover, .back-link:focus-visible { color: var(--brand-dark); }

header { text-align: center; margin-bottom: 30px; }

header h1 {
  font-family: 'Fredoka', system-ui, sans-serif;
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  margin: 0;
  color: var(--ink);
  letter-spacing: -0.01em;
}

header .num24 {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  color: var(--brand);
}

header p {
  font-family: 'Karla', sans-serif;
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin: 6px 0 0;
}

footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.82rem;
  margin-top: 34px;
  font-family: 'Karla', sans-serif;
}

/* ---------- logo lockup, shared by every page header ---------- */

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 18px;
}
.brand-mark { width: 30px; height: 30px; flex-shrink: 0; }
.brand-wordmark {
  font-family: 'Fredoka', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.brand-wordmark .a { color: var(--ink); }
.brand-wordmark .b { color: var(--brand); }

/* ---------- subject cover cards — used on the homepage ---------- */

.cover-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 22px;
}

.cover-card {
  border-radius: 22px;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 2px rgba(36,27,24,0.04);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.cover-card:hover, .cover-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(36,27,24,0.14);
}
.cover-card:focus-visible { outline: 3px solid var(--maths); outline-offset: 2px; }

.cover-card .cover {
  height: 104px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 16px 18px;
}
.cover-card .cover svg { width: 28px; height: 28px; }
.cover-card .cover .count {
  font-family: 'Space Mono', monospace;
  font-size: 0.66rem;
  font-weight: 700;
  color: #fff;
  background: rgba(255,255,255,0.24);
  padding: 4px 9px;
  border-radius: 999px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.cover-card.maths .cover { background: var(--maths); }
.cover-card.science .cover { background: var(--science); }
.cover-card.english .cover { background: var(--english); }
.cover-card.humanities .cover { background: var(--humanities); }

.cover-card .body {
  padding: 16px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-grow: 1;
}
.cover-card h2 {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 1.3rem;
  margin: 0;
}
.cover-card p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.45;
  margin: 0;
  flex-grow: 1;
}
.cover-card .go {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.cover-card.maths .go { color: var(--maths-dark); }
.cover-card.science .go { color: var(--science-dark); }
.cover-card.english .go { color: var(--english-dark); }
.cover-card.humanities .go { color: var(--humanities-dark); }

.cover-card-empty {
  border: 2px dashed var(--line);
  border-radius: 22px;
  min-height: 210px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--ink-soft);
  padding: 20px;
}
.cover-card-empty .plus {
  font-family: 'Space Mono', monospace;
  font-size: 1.4rem;
  line-height: 1;
  margin-bottom: 8px;
  opacity: 0.5;
}
.cover-card-empty p { font-family: 'Karla', sans-serif; font-size: 0.95rem; margin: 0; }

/* ---------- strand filter, used on subject pages with multiple strands ---------- */

.strand-filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}
.strand-filter button {
  font-family: 'Karla', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 18px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, transform 0.08s ease;
}
.strand-filter button:hover { transform: translateY(-1px); }
.strand-filter button.active { background: var(--ink); color: var(--ground); border-color: var(--ink); }

.game-row.hidden { display: none; }

/* ---------- subject page header + game list ---------- */

.subject-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.subject-chip {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.subject-chip svg { width: 24px; height: 24px; }
.subject-chip.maths { background: var(--maths); }
.subject-chip.science { background: var(--science); }
.subject-chip.english { background: var(--english); }
.subject-chip.humanities { background: var(--humanities); }

.game-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.game-row {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 20px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.game-row:hover, .game-row:focus-visible { transform: translateY(-2px); }
.game-row:focus-visible { outline: 3px solid var(--maths); outline-offset: 2px; }

.game-row .num {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ink-soft);
  width: 22px;
  flex-shrink: 0;
}
.game-row .info { flex-grow: 1; min-width: 0; }
.game-row h3 {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 1.08rem;
  margin: 0 0 3px;
}
.game-row p { font-size: 0.85rem; color: var(--ink-soft); margin: 0; line-height: 1.4; }
.game-row .meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.game-row.maths:hover { border-color: var(--maths); }
.game-row.science:hover { border-color: var(--science); }
.game-row.english:hover { border-color: var(--english); }
.game-row.humanities:hover { border-color: var(--humanities); }

.pill {
  font-family: 'Space Mono', monospace;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.pill.maths { background: rgba(47,111,237,0.12); color: var(--maths-dark); }
.pill.science { background: rgba(31,166,121,0.12); color: var(--science-dark); }
.pill.english { background: rgba(194,59,122,0.12); color: var(--english-dark); }
.pill.humanities { background: rgba(232,145,43,0.14); color: var(--humanities-dark); }

.timer-badge {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  font-size: 0.72rem;
  background: var(--ink);
  color: var(--ground);
  padding: 5px 9px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}
.timer-badge svg { width: 11px; height: 11px; }

@media (prefers-reduced-motion: reduce) {
  .cover-card, .cover-card:hover, .cover-card:focus-visible,
  .game-row, .game-row:hover, .game-row:focus-visible {
    transition: none;
  }
}