/* sudoku.css — Coffee Sudoku portal theme.
 *
 * Scoped under body.sudoku-portal so it doesn't leak into the writer
 * platform. Every colour is derived from the active CivNode theme
 * tokens (--bg-*, --text-*, --accent) via var() and color-mix() — no
 * hardcoded hex anchors. The portal looks at home in midnight, in the
 * champagne / parchment light themes, and in any user-customised
 * palette, because we never inject our own surface tone.
 *
 * The board itself reads "ink on paper" by virtue of contrast, not by
 * forcing cream. In midnight, ink-on-paper becomes light-on-dark; in
 * parchment, it stays light-paper-and-dark-ink. Either way the grid
 * structure is what reads, not the chrome.
 */

body.sudoku-portal {
  /* All sudoku-* tokens derive from the active theme. No hex anchors.
     If you find yourself needing a literal colour, derive it via
     color-mix() from one of the CivNode theme variables instead. */
  --sudoku-surface: var(--bg-primary);
  --sudoku-surface-soft: var(--bg-secondary);
  --sudoku-paper: var(--bg-surface);
  --sudoku-elevated: var(--bg-elevated);
  --sudoku-ink: var(--text-primary);
  --sudoku-ink-soft: var(--text-secondary);
  --sudoku-ink-muted: var(--text-muted);
  /* Hairlines stay quiet (subtle text contrast). Block dividers + the
     outer border lean on the active accent so the 3×3 structure reads
     as warm metal lines rather than flat grey rules. */
  --sudoku-hairline: color-mix(in srgb, var(--text-primary) 12%, transparent);
  --sudoku-block: color-mix(in srgb, var(--accent) 55%, transparent);
  --sudoku-block-strong: color-mix(in srgb, var(--accent) 75%, transparent);
  --sudoku-accent: var(--accent);
  --sudoku-accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --sudoku-accent-faint: color-mix(in srgb, var(--accent) 6%, transparent);
  --sudoku-given: var(--text-primary);
  --sudoku-pencil: var(--text-muted);
  --sudoku-conflict: var(--error);

  /* Inherit the active theme's surface + ink for body itself, not just
     the chrome inside #main. Without this body.color falls back to
     transparent, which would blank-out any descendant that doesn't set
     its own colour. */
  background: var(--sudoku-surface);
  color: var(--sudoku-ink);
}

/* The portal lives inside the regular CivNode chrome — main nav stays
   visible so users can navigate between sudoku and the rest of the
   site. The .sudoku-topbar acts as a section nav under the global one,
   not a wholesale replacement. */
body.sudoku-portal #main.sudoku-main {
  margin: 0;
  padding: 0;
  max-width: none;
  background: var(--sudoku-surface);
  color: var(--sudoku-ink);
  min-height: 100vh;
}

/* ---- Top bar ----------------------------------------------------------- */

.sudoku-topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--sudoku-hairline);
  background: var(--sudoku-surface);
}
.sudoku-topbar__brand {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--sudoku-ink);
  text-decoration: none;
}
.sudoku-topbar__links {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
}
.sudoku-topbar__link {
  color: var(--sudoku-ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 120ms ease, border-color 120ms ease;
}
.sudoku-topbar__link:hover { color: var(--sudoku-ink); }
.sudoku-topbar__link.is-active {
  color: var(--sudoku-ink);
  border-bottom-color: var(--sudoku-accent);
}
.sudoku-shell { min-height: 100vh; display: flex; flex-direction: column; }
.sudoku-body  {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  width: 100%;
  box-sizing: border-box;
}

/* The home screen wants an edge-to-edge canvas — opt out of the
   centered narrow column the inner screens use. */
.sudoku-body--full {
  max-width: none;
  padding: 0;
}

/* ---- Reusable CTA ----------------------------------------------------- */
/* Used on the home pane, the unlock screen, the empty-library state. */
.sudoku-cta {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  border: 1px solid var(--sudoku-accent);
  background: transparent;
  color: var(--sudoku-accent);
  font-family: 'Courier Prime', ui-monospace, monospace;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  transition: background 140ms ease, color 140ms ease;
}
.sudoku-cta:hover {
  background: var(--sudoku-accent);
  color: var(--sudoku-surface);
}

/* ---- Home: two-pane landing ------------------------------------------- */
/* Editorial weight on the left (eyebrow + italic hero + lede + CTA +
   four-block manifesto). Today's puzzle as a typographic artefact on
   the right. Below the pane: a three-card horizontal strip for
   Library / Store / Unlock. Mockup: sudoku-landing-mockups/mockup-3. */

.sudoku-pane {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 1.1fr;
  border-bottom: 1px solid var(--sudoku-hairline);
}
.sudoku-pane__left {
  padding: 4rem 3rem;
  border-right: 1px solid var(--sudoku-hairline);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.sudoku-pane__right {
  padding: 3rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 50% 60% at 50% 50%, color-mix(in srgb, var(--sudoku-accent) 5%, transparent), transparent 70%),
    var(--sudoku-surface);
}

.sudoku-pane__eyebrow {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sudoku-ink-soft);
  margin: 0 0 1rem;
}
.sudoku-pane__title {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
  color: var(--sudoku-ink);
}
.sudoku-pane__lede {
  color: var(--sudoku-ink-soft);
  line-height: 1.65;
  margin: 0 0 2rem;
  max-width: 460px;
  font-size: 1.05rem;
}
.sudoku-pane__cta-row { margin: 0; }

/* The right-pane board slot. The board renders itself; this just
   provides centering + a slim skeleton state while the puzzle fetch
   resolves so the panel doesn't shift. */
.sudoku-pane__board {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 540px;
}
.sudoku-pane__board .sudoku-board {
  width: 100%;
}
.sudoku-pane__skeleton {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sudoku-ink-soft);
  margin: 0;
  padding: 6rem 0;
}

.sudoku-pane__manifesto {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--sudoku-hairline);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 2rem;
}
.sudoku-pane__manifesto p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--sudoku-ink-soft);
}
.sudoku-pane__manifesto p strong {
  color: var(--sudoku-ink);
  font-style: italic;
  font-weight: 500;
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-size: 1rem;
}

/* ---- Home: today's puzzle preview card -------------------------------- */
.sudoku-puzzle-card {
  width: min(420px, 100%);
  border: 1px solid var(--sudoku-hairline);
  background: var(--sudoku-elevated);
  padding: 2rem 2rem 2.25rem;
  cursor: pointer;
  transition: border-color 140ms ease, transform 140ms ease;
}
.sudoku-puzzle-card:hover {
  border-color: var(--sudoku-accent);
  transform: translateY(-2px);
}
.sudoku-puzzle-card__header {
  text-align: center;
  margin-bottom: 1.25rem;
}
.sudoku-puzzle-card__name {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 600;
  font-size: 1.4rem;
  margin: 0 0 0.3rem;
  color: var(--sudoku-ink);
}
.sudoku-puzzle-card__meta {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sudoku-ink-soft);
  margin: 0;
}
.sudoku-puzzle-card__grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  aspect-ratio: 1;
  width: 100%;
  border: 2px solid var(--sudoku-block);
  background: var(--sudoku-paper);
}
.sudoku-puzzle-card__cell {
  border-right: 1px solid var(--sudoku-hairline);
  border-bottom: 1px solid var(--sudoku-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: clamp(0.85rem, 1.4vw, 1.15rem);
  font-weight: 600;
  color: var(--sudoku-ink);
}
.sudoku-puzzle-card__cell.br {
  border-right: 1.5px solid var(--sudoku-block);
}
.sudoku-puzzle-card__cell.bb {
  border-bottom: 1.5px solid var(--sudoku-block);
}
.sudoku-puzzle-card__cell:nth-child(9n) { border-right: none; }
.sudoku-puzzle-card__cell:nth-child(n+73) { border-bottom: none; }
.sudoku-puzzle-card__caption {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  color: var(--sudoku-ink-soft);
  text-align: center;
  margin: 1.25rem 0 0;
  font-size: 0.95rem;
  min-height: 1.4em;
}

/* ---- Home: three-card strip below the pane ---------------------------- */
.sudoku-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--sudoku-hairline);
}
.sudoku-strip-card {
  padding: 2.25rem 2.5rem;
  border-right: 1px solid var(--sudoku-hairline);
  text-decoration: none;
  color: inherit;
  transition: background 140ms ease;
}
.sudoku-strip-card:last-child { border-right: 0; }
.sudoku-strip-card:hover { background: var(--sudoku-elevated); }
.sudoku-strip-card__num {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sudoku-accent);
  margin: 0 0 0.6rem;
}
.sudoku-strip-card__title {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 600;
  font-size: 1.3rem;
  margin: 0 0 0.4rem;
  color: var(--sudoku-ink);
}
.sudoku-strip-card__lede {
  margin: 0;
  color: var(--sudoku-ink-soft);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* When the wide Race tile is present the strip switches to 4 columns
   so the existing 3 cards stay 1fr each and the Race card claims 2.
   Round-2 mockup 5. */
.sudoku-strip--with-race { grid-template-columns: repeat(4, 1fr); }
.sudoku-strip-card--race {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto auto;
  column-gap: 1.6rem;
  background: color-mix(in srgb, var(--sudoku-paper) 92%, var(--sudoku-accent) 4%);
}
.sudoku-strip-card--race:hover { background: var(--sudoku-elevated); }
.sudoku-strip-card--race .sudoku-strip-card__num,
.sudoku-strip-card--race .sudoku-strip-card__title,
.sudoku-strip-card--race .sudoku-strip-card__lede { grid-column: 1; }
.sudoku-strip-card__modes {
  grid-column: 1 / span 2;
  display: flex; gap: 1.2rem; flex-wrap: wrap;
  margin-top: 0.6rem;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--sudoku-ink-muted);
}
.sudoku-strip-card__mode strong {
  color: var(--sudoku-ink-soft); margin-right: 0.4rem; font-weight: 700;
}
.sudoku-strip-card--race .sudoku-strip-card__cta {
  grid-column: 2; grid-row: 2;
  align-self: end; justify-self: end;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--sudoku-accent); font-weight: 700;
}

/* On narrow screens the pane stacks vertically; the strip becomes a
   single column too. */
@media (max-width: 880px) {
  .sudoku-pane { grid-template-columns: 1fr; }
  .sudoku-pane__left { border-right: 0; border-bottom: 1px solid var(--sudoku-hairline); padding: 3rem 2rem; }
  .sudoku-pane__right { padding: 3rem 2rem; }
  .sudoku-pane__manifesto { grid-template-columns: 1fr; }
  .sudoku-strip,
  .sudoku-strip--with-race { grid-template-columns: 1fr; }
  .sudoku-strip-card { border-right: 0; border-bottom: 1px solid var(--sudoku-hairline); }
  .sudoku-strip-card:last-child { border-bottom: 0; }
  .sudoku-strip-card--race { grid-column: span 1; grid-template-columns: 1fr; }
  .sudoku-strip-card--race .sudoku-strip-card__cta { grid-column: 1; grid-row: auto; justify-self: start; }
}

/* ---- Page chrome ------------------------------------------------------- */

.sudoku-page__title {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 2rem;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}
.sudoku-page__lede {
  margin: 0 0 2rem;
  color: var(--sudoku-ink-soft);
  font-size: 1rem;
  line-height: 1.55;
  max-width: 680px;
}
.sudoku-loading,
.sudoku-error {
  text-align: center;
  padding: 4rem 0;
  color: var(--sudoku-ink-soft);
}
.sudoku-empty {
  padding: 4rem 0;
  text-align: center;
  color: var(--sudoku-ink-soft);
}
.sudoku-empty h2 {
  margin: 0 0 0.75rem;
  color: var(--sudoku-ink);
  font-family: 'Courier Prime', ui-monospace, monospace;
}
.sudoku-empty p { margin: 0 0 1.5rem; }

/* ---- Library / store grid --------------------------------------------- */

.sudoku-volume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}
.sudoku-volume-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1.5rem;
  background: var(--sudoku-elevated);
  border: 1px solid var(--sudoku-hairline);
  transition: border-color 120ms ease, transform 120ms ease;
}
.sudoku-volume-card:hover {
  border-color: var(--sudoku-accent);
  transform: translateY(-2px);
}
.sudoku-volume-card h3 {
  font-family: 'Courier Prime', ui-monospace, monospace;
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.sudoku-volume-card__sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--sudoku-ink-soft);
  text-transform: lowercase;
  letter-spacing: 0.03em;
}

/* ---- Unlock form ------------------------------------------------------- */

.sudoku-unlock {
  max-width: 540px;
  margin: 2rem auto;
}

/* ---- Volume detail page ----------------------------------------------- */

.sudoku-volume-header {
  text-align: center;
  margin: 1rem 0 3rem;
  position: relative;
}
.sudoku-volume-header__eyebrow {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--sudoku-accent);
  margin: 0 0 0.75rem;
}
.sudoku-volume-header__title {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 2.6rem);
  letter-spacing: -0.005em;
  margin: 0 0 0.6rem;
  color: var(--sudoku-ink);
}
.sudoku-volume-header__meta {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sudoku-ink-soft);
  margin: 0;
}
.sudoku-volume-header__tag {
  display: inline-block;
  margin-top: 0.85rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--sudoku-accent);
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sudoku-accent);
}

/* Buy / Unlock split box. */
.sudoku-buy-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 0 auto 3rem;
  max-width: 880px;
}
@media (max-width: 720px) {
  .sudoku-buy-box { grid-template-columns: 1fr; }
}
.sudoku-buy-box__left, .sudoku-buy-box__right {
  padding: 2rem;
  background: var(--sudoku-elevated);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.sudoku-buy-box h2 {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.25rem;
  margin: 0;
  color: var(--sudoku-ink);
}
.sudoku-buy-box p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--sudoku-ink-soft);
}
.sudoku-buy-box .sudoku-cta { align-self: flex-start; }
.sudoku-cta--ghost {
  border-color: var(--sudoku-hairline);
  color: var(--sudoku-ink);
}
.sudoku-cta--ghost:hover {
  background: var(--sudoku-accent);
  color: var(--sudoku-surface);
  border-color: var(--sudoku-accent);
}

/* Poetic TOC. Two-column on wide screens, one on narrow. */
.sudoku-toc {
  margin: 0 auto 4rem;
  max-width: 880px;
}
.sudoku-toc__head {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
  color: var(--sudoku-ink);
}
.sudoku-toc__lede {
  margin: 0 0 1.75rem;
  color: var(--sudoku-ink-soft);
  font-size: 0.95rem;
}
.sudoku-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  columns: 2;
  column-gap: 2.5rem;
}
@media (max-width: 720px) {
  .sudoku-toc__list { columns: 1; }
}
.sudoku-toc__row {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.5rem 0.5rem;
  border-bottom: 1px solid var(--sudoku-hairline);
  break-inside: avoid;
  cursor: pointer;
  outline: none;
  transition: background 120ms;
}
.sudoku-toc__row:hover { background: var(--sudoku-accent-faint); }
.sudoku-toc__row:focus { background: var(--sudoku-accent-soft); }
.sudoku-toc__row.is-locked {
  cursor: default;
  opacity: 0.62;
}
.sudoku-toc__row.is-locked:hover { background: transparent; }
.sudoku-toc__num {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--sudoku-ink-muted);
}
.sudoku-toc__name {
  font-family: 'Iowan Old Style', 'Palatino', Georgia, serif;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--sudoku-ink);
}
.sudoku-toc__row.is-locked .sudoku-toc__name { color: var(--sudoku-ink-soft); }
.sudoku-toc__band {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sudoku-ink-muted);
}
.sudoku-unlock__form {
  display: flex;
  gap: 0.75rem;
  margin: 1.5rem 0 0.75rem;
}
.sudoku-unlock__input {
  flex: 1;
  padding: 0.85rem 1rem;
  background: var(--sudoku-elevated);
  border: 1px solid var(--sudoku-hairline);
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 1rem;
  color: var(--sudoku-ink);
}
.sudoku-unlock__input:focus {
  outline: none;
  border-color: var(--sudoku-accent);
}
.sudoku-unlock__message {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  min-height: 1.4em;
}
.sudoku-unlock__message.is-error { color: var(--sudoku-conflict); }
.sudoku-unlock__message.is-ok    { color: var(--sudoku-accent); }

/* ---- Board ------------------------------------------------------------- */

.sudoku-play {
  max-width: 720px;
  margin: 1rem auto;
}
.sudoku-board {
  --sudoku-cell-size: clamp(36px, 7vw, 56px);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1.25rem;
}
.sudoku-board.is-readonly { pointer-events: none; }

.sudoku-board__header { text-align: center; }
.sudoku-board__title {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 1.6rem;
  margin: 0 0 0.25rem;
  letter-spacing: -0.01em;
}
.sudoku-board__caption {
  margin: 0 0 0.5rem;
  color: var(--sudoku-ink-soft);
  font-style: italic;
}
.sudoku-board__meta {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.85rem;
  color: var(--sudoku-ink-soft);
  letter-spacing: 0.04em;
}
.sudoku-board__band { text-transform: lowercase; }

/* The grid: 9 columns, 9 rows, subtle hairline cell borders inside,
   accent-toned outer border + 3×3 block dividers. The colour comes
   from --sudoku-block which is mixed from the active --accent so the
   grid lines pick up whatever warm/cool the theme uses. */
.sudoku-board__grid {
  display: grid;
  grid-template-columns: repeat(9, var(--sudoku-cell-size));
  grid-template-rows: repeat(9, var(--sudoku-cell-size));
  margin: 0 auto;
  border: 2px solid var(--sudoku-block-strong);
  background: var(--sudoku-paper);
  position: relative;
}
.sudoku-cell {
  position: relative;
  width: var(--sudoku-cell-size);
  height: var(--sudoku-cell-size);
  border-right: 1px solid var(--sudoku-hairline);
  border-bottom: 1px solid var(--sudoku-hairline);
  background: transparent;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: calc(var(--sudoku-cell-size) * 0.55);
  color: var(--sudoku-ink);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}
.sudoku-cell.block-right  { border-right: 2px solid var(--sudoku-block); }
.sudoku-cell.block-bottom { border-bottom: 2px solid var(--sudoku-block); }
.sudoku-cell:nth-child(9n)     { border-right: none; }
.sudoku-cell:nth-child(n+73)   { border-bottom: none; }

/* Focused cell — the target where the next digit will land. Needs to
   read at a glance, so we use a 2px inset accent border on top of the
   accent wash. The inset draws inside the cell rather than overlapping
   neighbouring cells, and it comes from --sudoku-accent so it tracks
   the active theme. */
.sudoku-cell:focus {
  background: var(--sudoku-accent-soft);
  box-shadow: inset 0 0 0 2px var(--sudoku-accent);
  z-index: 2;
}
.sudoku-cell.is-peer { background: color-mix(in srgb, var(--sudoku-accent) 6%, transparent); }
.sudoku-cell.is-active-row {
  background: color-mix(in srgb, var(--sudoku-accent) 12%, transparent);
}
.sudoku-cell.is-given .sudoku-cell__value { font-weight: 700; color: var(--sudoku-given); }
/* In theme palette, distinguish user-entered digits from givens by
   colour rather than weight: givens read as ink, the player's marks
   read as accent. Cafe mode overrides this with per-digit hues. */
.sudoku-board[data-palette="theme"] .sudoku-cell:not(.is-given) .sudoku-cell__value {
  color: var(--sudoku-accent);
}
.sudoku-cell.is-conflict { background: color-mix(in srgb, var(--sudoku-conflict) 14%, transparent); }
.sudoku-cell.is-hint { box-shadow: inset 0 0 0 2px var(--sudoku-accent); }

/* ---- Cafe palette ----------------------------------------------------- */
/* Opt-in alternate palette: every digit gets its own hue from the active
   theme's semantic tokens (research/plot/error/etc.), backdrop picks up
   the same diagonal radial gradient as the mockup. Default mode is
   `theme` — quiet, single-ink, accent-only — and stays unchanged above.
   Pearl/Ink discipline still applies: --sudoku-ink follows the theme
   regardless of which palette is active. */

.sudoku-board[data-palette="cafe"] .sudoku-board__grid {
  background:
    radial-gradient(ellipse 60% 80% at 20% 20%, color-mix(in srgb, var(--plot)     14%, transparent), transparent 70%),
    radial-gradient(ellipse 60% 80% at 85% 75%, color-mix(in srgb, var(--research) 14%, transparent), transparent 70%),
    radial-gradient(ellipse 50% 60% at 50% 50%, color-mix(in srgb, var(--accent)    6%, transparent), transparent 70%),
    var(--sudoku-paper);
}

/* Set per-digit hues at the cell level so that currentColor resolves
   correctly for is-active-row's same-digit wash. The value inherits. */
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="1"] { color: var(--research); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="2"] { color: var(--accent); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="3"] { color: var(--resonance); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="4"] { color: var(--success); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="5"] { color: var(--plot); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="6"] { color: var(--error); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="7"] { color: var(--attention); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="8"] { color: var(--sudoku-ink); }
.sudoku-board[data-palette="cafe"] .sudoku-cell[data-digit="9"] {
  color: color-mix(in srgb, var(--research) 70%, var(--plot));
}

/* In cafe mode givens keep their digit hue — drop the global is-given
   ink override. */
.sudoku-board[data-palette="cafe"] .sudoku-cell.is-given .sudoku-cell__value {
  color: inherit;
}

/* Peer wash leans research, same-digit wash leans the digit's own hue. */
.sudoku-board[data-palette="cafe"] .sudoku-cell.is-peer {
  background: color-mix(in srgb, var(--research) 9%, transparent);
}
.sudoku-board[data-palette="cafe"] .sudoku-cell.is-active-row {
  background: color-mix(in srgb, currentColor 16%, transparent);
}

/* ---- Palette toggle (header) ----------------------------------------- */
.sudoku-palette-toggle {
  display: inline-flex;
  border: 1px solid var(--sudoku-hairline);
  border-radius: 999px;
  align-self: center;
  flex-shrink: 0;
}
.sudoku-palette-toggle__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--sudoku-ink-soft);
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 120ms ease, background 120ms ease;
}
.sudoku-palette-toggle__btn[aria-pressed="true"] {
  color: var(--sudoku-ink);
  background: color-mix(in srgb, var(--sudoku-accent) 18%, transparent);
}
.sudoku-palette-toggle__btn:hover { color: var(--sudoku-ink); }
.sudoku-palette-toggle__btn:focus-visible {
  outline: 2px solid var(--sudoku-accent);
  outline-offset: 2px;
}

/* ---- Input-mode toggle (header) -------------------------------------- */
/* Mirrors the palette toggle's shape so the meta row has a consistent
   pair of segmented controls. */
.sudoku-input-toggle {
  display: inline-flex;
  border: 1px solid var(--sudoku-hairline);
  border-radius: 999px;
  align-self: center;
  flex-shrink: 0;
}
.sudoku-input-toggle__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--sudoku-ink-soft);
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 120ms ease, background 120ms ease;
}
.sudoku-input-toggle__btn[aria-pressed="true"] {
  color: var(--sudoku-ink);
  background: color-mix(in srgb, var(--sudoku-accent) 18%, transparent);
}
.sudoku-input-toggle__btn:hover { color: var(--sudoku-ink); }
.sudoku-input-toggle__btn:focus-visible {
  outline: 2px solid var(--sudoku-accent);
  outline-offset: 2px;
}

/* ---- Voice mic button (header) --------------------------------------- */
.sudoku-mic-btn {
  appearance: none;
  border: 1px solid var(--sudoku-hairline);
  background: transparent;
  color: var(--sudoku-ink-soft);
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  cursor: pointer;
  border-radius: 999px;
  align-self: center;
  transition: color 120ms ease, border-color 120ms ease;
  /* Hidden by default — Speed mode reveals it. */
  display: none;
}
.sudoku-board[data-input="speed"] .sudoku-mic-btn { display: inline-flex; align-items: center; }
.sudoku-mic-btn:hover { color: var(--sudoku-ink); border-color: var(--sudoku-accent); }
.sudoku-mic-btn:focus-visible {
  outline: 2px solid var(--sudoku-accent);
  outline-offset: 2px;
}
.sudoku-mic-btn[aria-pressed="true"],
.sudoku-mic-btn.is-listening {
  color: var(--sudoku-surface);
  background: var(--sudoku-accent);
  border-color: var(--sudoku-accent);
  /* Soft pulse so it's obvious the mic is hot. */
  animation: sudoku-mic-pulse 1.6s ease-in-out infinite;
}
@keyframes sudoku-mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--sudoku-accent) 40%, transparent); }
  50%      { box-shadow: 0 0 0 6px color-mix(in srgb, var(--sudoku-accent)  0%, transparent); }
}

/* ---- BPV buffer (between header and grid) ---------------------------- */
.sudoku-bpv-buffer {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 0.5rem 0 1rem;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  color: var(--sudoku-ink-soft);
  transition: color 200ms ease;
}
.sudoku-board[data-input="speed"] .sudoku-bpv-buffer { display: flex; }
.sudoku-bpv-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--sudoku-ink-muted);
  background: var(--sudoku-elevated);
  transition: color 120ms, background 120ms, border-color 120ms;
}
.sudoku-bpv-slot.is-filled {
  color: var(--sudoku-accent);
  border-color: var(--sudoku-accent);
}
.sudoku-bpv-label {
  margin-left: 0.4rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.sudoku-bpv-buffer.is-error .sudoku-bpv-slot {
  color: var(--sudoku-conflict);
  border-color: var(--sudoku-conflict);
}

/* ---- Box + cell number overlays (Speed mode only) -------------------- */
/* Each cell carries two faint numerals in opposite corners: the cell's
   position-within-box (1–9) and, for the top-left cell of each box, the
   box index (1–9). The numerals only render when the board is in
   Speed mode so Standard mode stays clean. */
.sudoku-board[data-input="speed"] .sudoku-cell::before {
  content: attr(data-bpv-pos);
  position: absolute;
  top: 2px; left: 4px;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: calc(var(--sudoku-cell-size) * 0.18);
  color: color-mix(in srgb, var(--sudoku-ink) 26%, transparent);
  pointer-events: none;
  line-height: 1;
}
.sudoku-board[data-input="speed"] .sudoku-cell[data-bpv-box]::after {
  content: attr(data-bpv-box);
  position: absolute;
  bottom: 2px; right: 4px;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: calc(var(--sudoku-cell-size) * 0.22);
  font-weight: 700;
  color: color-mix(in srgb, var(--sudoku-accent) 80%, transparent);
  pointer-events: none;
  line-height: 1;
}

/* ---- Zen button (header) --------------------------------------------- */
.sudoku-zen-btn {
  appearance: none;
  border: 1px solid var(--sudoku-hairline);
  background: transparent;
  color: var(--sudoku-ink-soft);
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  cursor: pointer;
  border-radius: 999px;
  transition: color 120ms ease, border-color 120ms ease;
  align-self: center;
}
.sudoku-zen-btn:hover { color: var(--sudoku-ink); border-color: var(--sudoku-accent); }
.sudoku-zen-btn:focus-visible {
  outline: 2px solid var(--sudoku-accent);
  outline-offset: 2px;
}
.sudoku-zen-btn[aria-pressed="true"] {
  color: var(--sudoku-surface);
  background: var(--sudoku-accent);
  border-color: var(--sudoku-accent);
}

/* ---- Zen mode --------------------------------------------------------
 * When body.sudoku-zen is set, hide every shell element and float the
 * board in the centre of the viewport. Triggered from the Zen button
 * inside the board's header; cleared on Esc, on board destroy, or on
 * route change. */
body.sudoku-zen header.topbar,
body.sudoku-zen .top-bar,
body.sudoku-zen .top-nav,
body.sudoku-zen nav.app-nav,
body.sudoku-zen #bottom-nav,
body.sudoku-zen .floating-search,
body.sudoku-zen .sudoku-topbar,
body.sudoku-zen .sudoku-pane__left,
body.sudoku-zen .sudoku-strip,
body.sudoku-zen .sudoku-volume-header,
body.sudoku-zen .sudoku-buy-box,
body.sudoku-zen .sudoku-toc,
body.sudoku-zen #toast-container {
  display: none !important;
}
body.sudoku-zen #main.sudoku-main,
body.sudoku-zen .sudoku-shell,
body.sudoku-zen .sudoku-body,
body.sudoku-zen .sudoku-pane,
body.sudoku-zen .sudoku-pane__right,
body.sudoku-zen .sudoku-pane__board,
body.sudoku-zen .sudoku-play {
  background: var(--sudoku-surface) !important;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 0;
  margin: 0;
  max-width: none;
}
body.sudoku-zen .sudoku-board {
  width: min(640px, 90vw);
  max-width: 640px;
  margin: auto;
}
body.sudoku-zen .sudoku-board__title {
  /* Keep the title — it's part of the board, not chrome. */
}
/* Page background tracks the theme surface so the board sits on a
   uniform field. */
body.sudoku-zen { background: var(--sudoku-surface); }

.sudoku-cell__value {
  display: inline-block;
  line-height: 1;
}
.sudoku-cell__notes {
  position: absolute;
  inset: 4%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  font-size: calc(var(--sudoku-cell-size) * 0.22);
  color: var(--sudoku-pencil);
  pointer-events: none;
}
.sudoku-cell__note {
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
}
.sudoku-cell.has-value .sudoku-cell__notes { display: none; }

/* ---- Toolbar / pad ----------------------------------------------------- */

.sudoku-board__toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  align-items: center;
}
.sudoku-pad {
  display: grid;
  grid-template-columns: repeat(10, minmax(36px, 1fr));
  gap: 0.4rem;
  flex: 1;
  max-width: 480px;
}
.sudoku-pad__key {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 1rem;
  padding: 0.55rem 0;
  background: var(--sudoku-elevated);
  border: 1px solid var(--sudoku-hairline);
  color: var(--sudoku-ink);
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}
.sudoku-pad__key:hover {
  border-color: var(--sudoku-accent);
  background: var(--sudoku-surface);
}
.sudoku-pad__erase { color: var(--sudoku-ink-soft); }

.sudoku-actions { display: flex; gap: 0.5rem; }
.sudoku-action {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.9rem;
  padding: 0.55rem 0.9rem;
  background: transparent;
  border: 1px solid var(--sudoku-hairline);
  color: var(--sudoku-ink-soft);
  cursor: pointer;
  transition: color 120ms, border-color 120ms;
}
.sudoku-action:hover { color: var(--sudoku-ink); border-color: var(--sudoku-accent); }
.sudoku-action.is-active {
  background: var(--sudoku-accent);
  color: var(--sudoku-surface);
  border-color: var(--sudoku-accent);
}

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

.sudoku-board__status {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
/* Rating block — three coffee beans. Unrated beans are dim outlines;
   rated beans are solid + full opacity. Three filled = best; one filled
   = "I'd skip it." Word "Rating" is rendered alongside so it's
   unambiguous (the printed book also uses three beans + the word
   "Rating", and we mirror it on screen). */
.sudoku-rating {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--sudoku-accent);
}
.sudoku-rating__label {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sudoku-ink-soft);
  margin-right: 0.25rem;
}
.sudoku-rating__beans {
  display: flex;
  gap: 0.35rem;
}
.sudoku-rating__bean {
  background: transparent;
  border: none;
  padding: 4px;
  cursor: pointer;
  color: inherit;
  line-height: 0;
}
.sudoku-rating__bean:hover { transform: scale(1.08); }

/* Bean glyph — same Flaticon-derived shape as the printed book.
   CSS-masked so the bean colour follows currentColor and tints with
   --sudoku-accent.

   Two visual states, deliberately unambiguous so 3 filled beans reads
   as "three filled = best" without explanation:

     default (no .is-filled)  — outline bean, dim (accent at low
                                 opacity). Reads as "tap me, nothing
                                 selected yet."
     .is-filled               — solid bean, full accent. Reads as
                                 "this bean is set." */
.sudoku-bean {
  display: inline-block;
  width: 22px;
  height: 22px;
  background-color: var(--sudoku-accent);
  opacity: 0.35;
  -webkit-mask-position: center;
          mask-position: center;
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
  -webkit-mask-size: contain;
          mask-size: contain;
  -webkit-mask-image: url('/icons/coffee/bean-outline.svg');
          mask-image: url('/icons/coffee/bean-outline.svg');
  transition: opacity 120ms ease, transform 120ms ease;
}
.sudoku-bean.is-filled {
  opacity: 1;
  -webkit-mask-image: url('/icons/coffee/bean-solid.svg');
          mask-image: url('/icons/coffee/bean-solid.svg');
}
.sudoku-board__message {
  margin: 0;
  color: var(--sudoku-ink-soft);
  min-height: 1.2em;
  font-size: 0.95rem;
}
.sudoku-board.is-solved .sudoku-board__message { color: var(--sudoku-accent); }

/* ===================================================================
   Race view — multiplayer match screens.
   Layout: Mockup 7 (rail cards) — dominant board centred, my-progress
   bar directly under, opponents in a centred horizontal rail at the
   bottom. Floating timer top-centre, forfeit pill top-right.
   =================================================================== */

/* When a race screen is mounted, body.sudoku-race-mode hides the global
   civnode chrome AND the sudoku portal top bar. The race screen draws
   its own minimal chrome instead. */
body.sudoku-race-mode .global-nav,
body.sudoku-race-mode .topbar,
body.sudoku-race-mode .global-topbar,
body.sudoku-race-mode .sudoku-topbar { display: none; }
body.sudoku-race-mode { overflow: hidden; height: 100vh; }
body.sudoku-race-mode #main {
  margin: 0; padding: 0; max-width: none; min-height: 100vh;
  background: var(--sudoku-surface);
}

/* The board's bottom block (rating, palette toggle) is dropped here —
   the race view supplies its own progress chrome and the rating only
   makes sense on a finished puzzle, not mid-race. */
.sudoku-board.is-headerless .sudoku-board__header { display: none; }

/* ---- Live race ----------------------------------------------------- */

.sudoku-race {
  --chrome: 220px;
  height: 100vh;
  display: grid;
  grid-template-rows: 1fr auto;
  /* Top padding clears the fixed title/timer/forfeit chrome (top: 18px,
     ~37px tall = bottom 55px) plus breathing room so the board doesn't
     tuck under them on short viewports (1920x1080 minus browser chrome
     leaves ~920px of usable height, which previously left only ~10px
     between timer and the first board row). */
  padding: 88px 28px 14px 28px;
  box-sizing: border-box;
  gap: 12px;
  overflow: hidden;
}

.sudoku-race__title {
  position: fixed; top: 18px; left: 22px; z-index: 5;
  font-family: 'Iowan Old Style', Georgia, serif;
  font-style: italic; font-size: 0.92rem; color: var(--sudoku-ink-soft);
}
.sudoku-race__timer {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%);
  z-index: 5;
  display: flex; align-items: center; gap: 14px;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.18em; color: var(--sudoku-ink-muted);
  text-transform: uppercase;
  background: color-mix(in srgb, var(--sudoku-paper) 70%, transparent);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 999px; padding: 0.4rem 1rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.sudoku-race__round-label { color: var(--sudoku-ink-muted); }
.sudoku-race__timer-value { color: var(--sudoku-accent); font-weight: 700;
  font-size: 0.96rem; letter-spacing: 0.2em; }

.sudoku-race__forfeit {
  position: fixed; top: 18px; right: 22px; z-index: 5;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem; letter-spacing: 0.16em;
  padding: 0.4rem 0.95rem;
  border: 1px solid var(--sudoku-hairline); border-radius: 999px;
  color: var(--sudoku-ink-soft);
  background: color-mix(in srgb, var(--sudoku-paper) 70%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
}
.sudoku-race__forfeit:hover { color: var(--sudoku-ink); border-color: var(--sudoku-block); }
.sudoku-race__forfeit:disabled { opacity: 0.4; cursor: default; }

.sudoku-race__board-area {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; min-height: 0;
}
.sudoku-race__board-slot {
  width: 100%;
  max-width: min(calc(100vh - var(--chrome)), 720px);
  display: flex; align-items: center; justify-content: center;
}
.sudoku-race__board-slot .sudoku-board { width: 100%; }

.sudoku-race__my-progress {
  width: 100%;
  max-width: min(calc(100vh - var(--chrome)), 720px);
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem; letter-spacing: 0.14em; color: var(--sudoku-ink-soft);
}
.sudoku-race__my-progress strong { color: var(--sudoku-accent); font-weight: 700; }
.sudoku-race__my-progress-bar {
  flex: 1; margin: 0 16px; height: 2px;
  background: var(--sudoku-elevated); border-radius: 1px;
  position: relative; overflow: hidden;
}
.sudoku-race__my-progress-bar::after {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: var(--w, 0%); background: var(--sudoku-accent);
  transition: width 240ms ease;
}

.sudoku-race__rail {
  display: flex; gap: 10px; justify-content: center;
  flex-wrap: nowrap;
  align-self: end;
}
.sudoku-race-card {
  width: 88px;
  display: flex; flex-direction: column; gap: 4px;
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px;
  padding: 5px;
}
.sudoku-race-card.is-finished { border-color: var(--sudoku-accent); }
.sudoku-race-card__head {
  display: flex; justify-content: space-between;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.6rem; letter-spacing: 0.04em;
  color: var(--sudoku-ink-soft);
}
.sudoku-race-card__head strong { color: var(--sudoku-ink); font-weight: 700; }
.sudoku-race-card__grid {
  display: grid; grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  width: 100%; aspect-ratio: 1;
  border: 1px solid var(--sudoku-block);
  background: var(--sudoku-surface);
}
.sudoku-race-card__cell {
  border-right: 0.5px solid color-mix(in srgb, var(--sudoku-ink) 6%, transparent);
  border-bottom: 0.5px solid color-mix(in srgb, var(--sudoku-ink) 6%, transparent);
  aspect-ratio: 1;
}
.sudoku-race-card__cell.br { border-right: 0.75px solid var(--sudoku-block); }
.sudoku-race-card__cell.bb { border-bottom: 0.75px solid var(--sudoku-block); }
.sudoku-race-card__cell:nth-child(9n) { border-right: none; }
.sudoku-race-card__cell:nth-child(n+73) { border-bottom: none; }
.sudoku-race-card__cell.s1 { background: var(--sudoku-accent); }
.sudoku-race-card__cell.s2 { background: var(--sudoku-conflict); }
.sudoku-race-card__bar {
  height: 2px; background: var(--sudoku-elevated); border-radius: 1px;
  position: relative; overflow: hidden;
}
.sudoku-race-card__bar::after {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: var(--w, 0%); background: var(--sudoku-accent);
  transition: width 240ms ease;
}
.sudoku-race-card[data-team="research"] .sudoku-race-card__bar::after,
.sudoku-race-card[data-team="research"] .sudoku-race-card__cell.s1 {
  background: var(--research);
}
.sudoku-race-card[data-team="plot"] .sudoku-race-card__bar::after,
.sudoku-race-card[data-team="plot"] .sudoku-race-card__cell.s1 {
  background: var(--plot);
}
.sudoku-race-card[data-team="resonance"] .sudoku-race-card__bar::after,
.sudoku-race-card[data-team="resonance"] .sudoku-race-card__cell.s1 {
  background: var(--resonance);
}

.sudoku-race__error {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 6;
  font-family: 'Iowan Old Style', Georgia, serif;
  font-style: italic; color: var(--sudoku-ink-soft);
}

/* ---- Lobby --------------------------------------------------------- */

.sudoku-lobby {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px 28px 64px;
  display: flex; flex-direction: column; gap: 32px;
}
.sudoku-lobby__head { text-align: center; }
.sudoku-lobby__eyebrow {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--sudoku-accent); text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.sudoku-lobby__title {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-size: 2rem; margin: 0; color: var(--sudoku-ink);
}
.sudoku-lobby__title em {
  font-style: italic; font-weight: 600; letter-spacing: -0.005em;
}
.sudoku-lobby__lead {
  font-family: 'Iowan Old Style', Georgia, serif;
  color: var(--sudoku-ink-soft);
  margin: 0.6rem 0 0;
}

.sudoku-lobby__roster { display: flex; flex-direction: column; gap: 14px; }
.sudoku-lobby__team {
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-left: 2px solid var(--sudoku-accent);
  border-radius: 4px;
  padding: 14px 16px;
}
.sudoku-lobby__team[data-accent="research"]   { border-left-color: var(--research); }
.sudoku-lobby__team[data-accent="plot"]       { border-left-color: var(--plot); }
.sudoku-lobby__team[data-accent="resonance"]  { border-left-color: var(--resonance); }

.sudoku-lobby__team-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--sudoku-ink-muted); text-transform: uppercase;
  margin-bottom: 8px;
}
.sudoku-lobby__team-head strong {
  color: var(--sudoku-ink); font-family: 'Iowan Old Style', Georgia, serif;
  font-style: italic; font-size: 1rem; font-weight: 700;
  letter-spacing: 0; text-transform: none;
}
.sudoku-lobby__players {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 4px;
}
.sudoku-lobby__player {
  display: flex; gap: 10px; align-items: center;
  padding: 6px 0;
  font-family: 'Iowan Old Style', Georgia, serif;
  color: var(--sudoku-ink);
}
.sudoku-lobby__player.is-self .sudoku-lobby__alias { color: var(--sudoku-accent); font-weight: 700; }
.sudoku-lobby__host-badge {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.6rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--sudoku-ink-muted);
  border: 1px solid var(--sudoku-hairline);
  padding: 2px 8px; border-radius: 999px;
}
.sudoku-lobby__join {
  margin-top: 8px;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  background: transparent; color: var(--sudoku-ink-soft);
  border: 1px solid var(--sudoku-hairline); border-radius: 999px;
  padding: 0.4rem 1rem; cursor: pointer;
}
.sudoku-lobby__join:hover { color: var(--sudoku-ink); border-color: var(--sudoku-block); }

.sudoku-lobby__invite {
  background: var(--sudoku-paper);
  border: 1px dashed var(--sudoku-hairline);
  border-radius: 4px; padding: 12px 14px;
  display: flex; align-items: center; gap: 10px;
}
.sudoku-lobby__invite-label {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.66rem; letter-spacing: 0.18em;
  color: var(--sudoku-ink-muted); text-transform: uppercase;
}
.sudoku-lobby__invite-url {
  flex: 1; min-width: 0;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.78rem; color: var(--sudoku-ink);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.sudoku-lobby__invite-copy {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
  background: transparent; color: var(--sudoku-ink-soft);
  border: 1px solid var(--sudoku-hairline); border-radius: 999px;
  padding: 0.32rem 0.85rem; cursor: pointer;
}

.sudoku-lobby__actions {
  display: flex; justify-content: space-between; align-items: center;
}
.sudoku-lobby__exit, .sudoku-lobby__start {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase;
  border-radius: 999px; padding: 0.55rem 1.4rem; cursor: pointer;
}
.sudoku-lobby__exit {
  background: transparent; color: var(--sudoku-ink-soft);
  border: 1px solid var(--sudoku-hairline);
}
.sudoku-lobby__exit:hover { color: var(--sudoku-ink); border-color: var(--sudoku-block); }
.sudoku-lobby__start {
  background: var(--sudoku-accent); color: var(--sudoku-surface);
  border: 1px solid var(--sudoku-accent); font-weight: 700;
}
.sudoku-lobby__start:disabled {
  background: transparent; color: var(--sudoku-ink-muted);
  border-color: var(--sudoku-hairline); cursor: not-allowed;
}

.sudoku-lobby__error {
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px; padding: 32px;
  text-align: center;
}

/* ---- Result -------------------------------------------------------- */

.sudoku-result {
  max-width: 560px;
  margin: 0 auto;
  padding: 96px 28px 64px;
  display: flex; flex-direction: column; gap: 28px;
}
.sudoku-result__head { text-align: center; }
.sudoku-result__eyebrow {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--sudoku-accent); text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.sudoku-result__title {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-size: 2.2rem; margin: 0; color: var(--sudoku-ink);
}
.sudoku-result__title em { font-style: italic; font-weight: 600; }

.sudoku-result__standings {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column;
  border: 1px solid var(--sudoku-hairline); border-radius: 4px;
  overflow: hidden;
}
.sudoku-result__row {
  display: grid;
  grid-template-columns: 32px 1fr auto auto;
  gap: 12px; align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--sudoku-hairline);
  background: var(--sudoku-paper);
}
.sudoku-result__row:last-child { border-bottom: none; }
.sudoku-result__row.is-self { background: color-mix(in srgb, var(--sudoku-paper) 80%, var(--sudoku-accent) 8%); }
.sudoku-result__row.is-winner .sudoku-result__alias { color: var(--sudoku-accent); font-weight: 700; }
.sudoku-result__rank {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.78rem; color: var(--sudoku-ink-muted);
}
.sudoku-result__alias {
  font-family: 'Iowan Old Style', Georgia, serif;
  color: var(--sudoku-ink); font-size: 1rem;
}
.sudoku-result__team {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.62rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--sudoku-accent);
}
.sudoku-result__team[data-accent="research"]   { color: var(--research); }
.sudoku-result__team[data-accent="plot"]       { color: var(--plot); }
.sudoku-result__team[data-accent="resonance"]  { color: var(--resonance); }
.sudoku-result__rounds {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; color: var(--sudoku-ink-soft);
}
.sudoku-result__actions {
  display: flex; justify-content: center;
}
.sudoku-result__back {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase;
  background: var(--sudoku-accent); color: var(--sudoku-surface);
  border: 1px solid var(--sudoku-accent); border-radius: 999px;
  padding: 0.55rem 1.4rem; cursor: pointer; font-weight: 700;
}

/* ---- Active matches tray ------------------------------------------ */

.sudoku-match-tray {
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px;
  padding: 12px;
  display: flex; flex-direction: column; gap: 8px;
}
.sudoku-match-tray__head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.68rem; letter-spacing: 0.18em;
  color: var(--sudoku-ink-muted); text-transform: uppercase;
}
.sudoku-match-tray__count { color: var(--sudoku-ink-soft); }
.sudoku-match-tray__list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 6px;
}
.sudoku-match-tray__item {
  display: grid; grid-template-columns: 1fr auto;
  gap: 8px 12px; align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px;
  background: var(--sudoku-surface);
}
.sudoku-match-tray__item[data-status="in-progress"] { border-color: var(--sudoku-accent); }
.sudoku-match-tray__row {
  grid-column: 1 / span 1;
  display: flex; gap: 10px; align-items: baseline;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.08em;
}
.sudoku-match-tray__config { color: var(--sudoku-ink); font-weight: 700; }
.sudoku-match-tray__status {
  color: var(--sudoku-ink-muted); text-transform: uppercase;
  letter-spacing: 0.16em; font-size: 0.62rem;
}
.sudoku-match-tray__item[data-status="in-progress"] .sudoku-match-tray__status {
  color: var(--sudoku-accent);
}
.sudoku-match-tray__sub {
  grid-column: 1 / span 1;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.62rem; color: var(--sudoku-ink-muted);
  letter-spacing: 0.06em;
}
.sudoku-match-tray__open {
  grid-column: 2 / span 1; grid-row: 1 / span 2;
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
  background: transparent; color: var(--sudoku-ink-soft);
  border: 1px solid var(--sudoku-hairline); border-radius: 999px;
  padding: 0.35rem 0.85rem; cursor: pointer;
}
.sudoku-match-tray__open:hover { color: var(--sudoku-ink); border-color: var(--sudoku-block); }
.sudoku-match-tray__empty {
  font-family: 'Iowan Old Style', Georgia, serif;
  color: var(--sudoku-ink-muted); margin: 0;
  font-size: 0.88rem; font-style: italic;
}

/* ===================================================================
   /sudoku/compete — entry page
   =================================================================== */

.sudoku-compete {
  max-width: 920px;
  margin: 0 auto;
  padding: 56px 28px 96px;
  display: flex; flex-direction: column; gap: 36px;
}
.sudoku-compete__head { text-align: center; }
.sudoku-compete__eyebrow {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.22em;
  color: var(--sudoku-accent); text-transform: uppercase;
  margin: 0 0 0.6rem 0;
}
.sudoku-compete__title {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-size: 2.2rem; font-weight: 600; letter-spacing: -0.01em;
  color: var(--sudoku-ink); margin: 0;
}
.sudoku-compete__lede {
  font-family: 'Iowan Old Style', Georgia, serif;
  margin: 12px auto 0; max-width: 56ch;
  color: var(--sudoku-ink-soft); font-size: 1rem; line-height: 1.55;
}

.sudoku-compete__section { display: flex; flex-direction: column; gap: 12px; }
.sudoku-compete__section-head {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--sudoku-ink-muted); text-transform: uppercase;
  margin: 0; padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--sudoku-hairline);
}
.sudoku-compete__hint {
  margin: 0; color: var(--sudoku-ink-muted);
  font-size: 0.86rem; line-height: 1.5;
}

/* Mode picker — five tiles in a responsive grid. */
.sudoku-compete__modes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}
.sudoku-compete__mode,
.sudoku-compete__privacy-card,
.sudoku-compete__puzzle-card {
  display: flex; flex-direction: column; gap: 6px;
  text-align: left;
  padding: 14px 16px;
  border: 1px solid var(--sudoku-hairline);
  border-radius: 4px;
  background: var(--sudoku-paper);
  color: inherit;
  font: inherit;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}
.sudoku-compete__mode:hover,
.sudoku-compete__privacy-card:hover,
.sudoku-compete__puzzle-card:hover { border-color: var(--sudoku-block); }
.sudoku-compete__mode.is-active,
.sudoku-compete__privacy-card.is-active,
.sudoku-compete__puzzle-card.is-active {
  border-color: var(--sudoku-accent);
  background: color-mix(in srgb, var(--sudoku-paper) 86%, var(--sudoku-accent) 8%);
}
.sudoku-compete__mode-label {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-style: italic; font-weight: 700; font-size: 1.05rem;
  color: var(--sudoku-ink);
}
.sudoku-compete__mode-blurb {
  font-size: 0.86rem; color: var(--sudoku-ink-soft);
  line-height: 1.5;
}

.sudoku-compete__privacy {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
}

.sudoku-compete__puzzle { display: grid; grid-template-columns: 1fr; gap: 10px; }

/* Team names */
.sudoku-compete__teams .sudoku-compete__team-inputs {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px;
}
.sudoku-compete__team-input {
  display: flex; flex-direction: column; gap: 4px;
}
.sudoku-compete__team-input-label {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.66rem; letter-spacing: 0.16em;
  color: var(--sudoku-ink-muted); text-transform: uppercase;
}
.sudoku-compete__team-input input {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-size: 1rem; padding: 8px 12px;
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 3px;
  color: var(--sudoku-ink);
}
.sudoku-compete__team-input input:focus {
  outline: none; border-color: var(--sudoku-accent);
}

/* Create + error */
.sudoku-compete__action {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding-top: 8px;
}
.sudoku-compete__create {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.82rem; letter-spacing: 0.2em; text-transform: uppercase;
  background: var(--sudoku-accent); color: var(--sudoku-surface);
  border: 1px solid var(--sudoku-accent); border-radius: 999px;
  padding: 0.7rem 2rem; cursor: pointer; font-weight: 700;
}
.sudoku-compete__create:hover { background: color-mix(in srgb, var(--sudoku-accent) 88%, var(--sudoku-ink)); }
.sudoku-compete__create:disabled { opacity: 0.5; cursor: default; }
.sudoku-compete__error {
  margin: 0; color: var(--sudoku-conflict);
  font-family: 'Iowan Old Style', Georgia, serif; font-style: italic;
  font-size: 0.92rem;
}

/* Join with code */
.sudoku-compete__join { margin-top: 28px; padding-top: 24px;
  border-top: 1px dashed var(--sudoku-hairline); }
.sudoku-compete__join-row { display: flex; gap: 10px; }
.sudoku-compete__join-row input {
  flex: 1;
  font-family: 'Iowan Old Style', Georgia, serif;
  font-size: 0.96rem; padding: 10px 14px;
  background: var(--sudoku-paper);
  border: 1px solid var(--sudoku-hairline);
  border-radius: 3px;
  color: var(--sudoku-ink);
}
.sudoku-compete__join-row input:focus { outline: none; border-color: var(--sudoku-accent); }
.sudoku-compete__join-btn {
  font-family: 'Courier Prime', ui-monospace, monospace;
  font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase;
  background: transparent; color: var(--sudoku-ink-soft);
  border: 1px solid var(--sudoku-hairline); border-radius: 999px;
  padding: 0 1.2rem; cursor: pointer;
}
.sudoku-compete__join-btn:hover { color: var(--sudoku-ink); border-color: var(--sudoku-block); }
.sudoku-compete__join-btn:disabled { opacity: 0.5; cursor: default; }

@media (max-width: 720px) {
  .sudoku-compete__privacy { grid-template-columns: 1fr; }
  .sudoku-compete__teams .sudoku-compete__team-inputs { grid-template-columns: 1fr; }
}

/* ===================================================================
   Solve fireworks — pure-DOM celebration, see components/fireworks.js
   Patterned on cmd/civnode-ci/dashboard.html but with longer particle
   life (1800ms) and five staggered bursts.
   =================================================================== */

.sudoku-fx-layer {
  position: fixed; inset: 0; pointer-events: none; z-index: 60;
  overflow: hidden;
}
@keyframes sudoku-fx-burst {
  0%   { transform: translate(0, 0) scale(1); opacity: 1; }
  70%  { opacity: 1; }
  100% { transform: var(--fx-end, translate(0,0)) scale(0.32); opacity: 0; }
}
.sudoku-fx-particle {
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  animation: sudoku-fx-burst 1800ms cubic-bezier(.18,.7,.28,1) forwards;
  box-shadow: 0 0 8px currentColor;
  will-change: transform, opacity;
}
@keyframes sudoku-fx-spark {
  0%   { transform: translate(0, 0) rotate(0); opacity: 0; }
  15%  { opacity: 1; }
  100% { transform: var(--fx-end, translate(0,0)) rotate(540deg); opacity: 0; }
}
.sudoku-fx-spark {
  position: absolute;
  width: 12px; height: 2px;
  border-radius: 1px;
  animation: sudoku-fx-spark 1300ms cubic-bezier(.2,.8,.3,1) forwards;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  .sudoku-fx-particle, .sudoku-fx-spark { animation: none !important; opacity: 0 !important; }
}