:root {
  --color-bg: #f7f7f5;
  --color-surface: #ffffff;
  --color-surface-muted: #eeeeeb;
  --color-text: #171717;
  --color-muted: #6f6f69;
  --color-border: #deded8;
  --color-accent: #111111;
  --radius-sm: 6px;
  --radius-md: 10px;
  --shadow-subtle: 0 10px 30px rgba(20, 20, 20, 0.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
}

.site-header { box-shadow: 0 1px 0 rgba(0,0,0,.03); }
.navbar-brand { font-weight: 650; letter-spacing: -0.02em; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-sm);
  font-size: .75rem;
  font-weight: 700;
}
.nav-link { color: var(--color-muted); }
.nav-link.active, .nav-link:hover { color: var(--color-text); }

.hero-section { background: var(--color-bg); }
.eyebrow {
  color: var(--color-muted);
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
}
.lead { font-size: 1.05rem; line-height: 1.65; }
.panel, .ad-panel, .ad-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
}
.ad-panel {
  min-height: 180px;
  padding: 24px;
  display: grid;
  align-content: center;
  gap: 8px;
}
.ad-box {
  min-height: 170px;
  display: grid;
  place-items: center;
  color: var(--color-muted);
  background: #fbfbfa;
  border-style: dashed;
}

.btn { border-radius: var(--radius-sm); font-weight: 600; }
.btn-lg { padding: .72rem 1rem; font-size: 1rem; }
.form-control, .form-select, .list-group-item { border-radius: var(--radius-sm); }
.form-control:focus, .form-select:focus, .cell:focus-visible, .btn:focus-visible {
  border-color: #111;
  box-shadow: 0 0 0 .2rem rgba(17,17,17,.12);
}

.puzzle-list .active {
  background: var(--color-text);
  border-color: var(--color-text);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(82px, 1fr));
  gap: 8px;
}
.stats-grid div {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: #fbfbfa;
}
.stats-grid span { display: block; font-weight: 750; font-size: 1.05rem; }
.stats-grid small { color: var(--color-muted); text-transform: uppercase; letter-spacing: .08em; font-size: .68rem; }

.word-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-size), minmax(0, 1fr));
  gap: 4px;
  touch-action: none;
  user-select: none;
  max-width: min(100%, 660px);
}
.cell {
  aspect-ratio: 1;
  border: 1px solid var(--color-border);
  background: #fbfbfa;
  border-radius: 5px;
  color: var(--color-text);
  font-weight: 700;
  font-size: clamp(.72rem, 2.3vw, 1rem);
  line-height: 1;
  display: grid;
  place-items: center;
  padding: 0;
}
.cell:hover, .cell.selected { background: var(--color-surface-muted); }
.cell.found {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}
.word-bank {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  background: #fbfbfa;
}
.word-pill {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--color-surface);
  font-size: .82rem;
  font-weight: 650;
  color: var(--color-text);
}
.word-pill.found, .word-pill.found-static {
  background: var(--color-text);
  border-color: var(--color-text);
  color: #fff;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}
.toast-container { z-index: 1080; }
.app-toast {
  background: var(--color-text);
  color: #fff;
  border-radius: var(--radius-md);
  border: 0;
}

@media (max-width: 575.98px) {
  body { font-size: 14px; }
  .container { padding-left: 14px; padding-right: 14px; }
  .word-grid { gap: 3px; }
  .cell { border-radius: 4px; }
  .stats-grid { width: 100%; }
}