/* ═══════════════════════════════════════════════════
   IRREGULAR EXPRESSION — stylesheet
   All colours via CSS custom properties for easy reskin
═══════════════════════════════════════════════════ */

:root {
  --color-bg:        #1a1a2e;
  --color-surface:   #16213e;
  --color-surface2:  #0d1b34;
  --color-border:    #1e3a5f;
  --color-accent:    #0f9b8e;
  --color-accent-dim:#0a6b61;
  --color-match:     #f5a623;
  --color-success:   #4caf50;
  --color-failure:   #e53935;
  --color-boss:      #f5a623;
  --color-text:      #e0e0e0;
  --color-muted:     #7a7a9a;
  --color-locked:    #3a3a5a;

  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-ui:   system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius:    6px;
  --radius-lg: 12px;
  --transition: 150ms ease;
}

/* ── Reset & base ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
  overflow: hidden;
}

.mono { font-family: var(--font-mono); }
.muted { color: var(--color-muted); }

/* ── Screen system ──────────────────────────────── */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 220ms ease, transform 220ms ease;
  background: var(--color-bg);
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ── Shared header ──────────────────────────────── */
.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.screen-title-text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.xp-counter {
  font-size: 13px;
  color: var(--color-match);
}

/* ── Buttons ────────────────────────────────────── */
.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: #12b8a8;
  border-color: #12b8a8;
  box-shadow: 0 0 12px rgba(15,155,142,0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: transparent;
  padding-left: 8px;
}
.btn-ghost:hover { color: var(--color-text); }

.btn-hint {
  background: transparent;
  color: var(--color-match);
  border-color: var(--color-match);
}
.btn-hint:hover {
  background: rgba(245,166,35,0.1);
}
.btn-hint:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-wide { width: 100%; justify-content: center; padding: 14px; }

/* ════════════════════════════════════════════════
   TITLE SCREEN
════════════════════════════════════════════════ */
#screen-title {
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.title-scanline {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 2px,
    rgba(0,0,0,0.07) 2px,
    rgba(0,0,0,0.07) 4px
  );
  pointer-events: none;
  z-index: 0;
}

.title-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
  padding: 40px 20px;
}

.title-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.title-logo {
  font-family: var(--font-mono);
  font-size: clamp(52px, 10vw, 96px);
  font-weight: 700;
  color: var(--color-accent);
  text-shadow: 0 0 40px rgba(15,155,142,0.5), 0 0 80px rgba(15,155,142,0.2);
  letter-spacing: -0.02em;
  line-height: 1;
}

.title-tagline {
  font-size: 16px;
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

.title-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
  width: 260px;
}

.title-xp-badge {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-match);
  min-height: 20px;
}

.title-footer {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
}

/* ════════════════════════════════════════════════
   CAMPAIGN MAP
════════════════════════════════════════════════ */
.map-container {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.map-svg {
  display: block;
  width: 6500px;
  height: 100%;
  min-height: 400px;
  flex-shrink: 0;
}

/* SVG node styles (applied via JS) */
.map-node-world circle     { stroke-width: 3; }
.map-node-boss  circle     { stroke-width: 3; }
.map-node circle           { stroke-width: 2; }

/* ── Node state: completed ── */
.node-completed circle   { fill: var(--color-accent); stroke: var(--color-accent); }
.node-completed text     { fill: #fff; }

/* ── Node state: available (pulsing) ── */
.node-available circle {
  fill: transparent;
  stroke: var(--color-accent);
  animation: node-pulse 1.8s ease-in-out infinite;
}
.node-available text { fill: var(--color-accent); }

/* ── Node state: locked ── */
.node-locked circle  { fill: var(--color-locked); stroke: var(--color-locked); }
.node-locked text    { fill: var(--color-muted); }

/* ── Boss node ── */
.node-boss circle    { stroke: var(--color-boss); }
.node-boss.node-completed circle { fill: var(--color-boss); }
.node-boss.node-available circle { stroke: var(--color-boss); animation: boss-pulse 1.8s ease-in-out infinite; }

/* ── Side challenge ── */
.node-side circle    { stroke-dasharray: 4 3; }

@keyframes node-pulse {
  0%, 100% { stroke-width: 2; filter: drop-shadow(0 0 4px var(--color-accent)); }
  50%       { stroke-width: 4; filter: drop-shadow(0 0 12px var(--color-accent)); }
}

@keyframes boss-pulse {
  0%, 100% { stroke-width: 3; filter: drop-shadow(0 0 6px var(--color-boss)); }
  50%       { stroke-width: 5; filter: drop-shadow(0 0 18px var(--color-boss)); }
}

/* ════════════════════════════════════════════════
   CHALLENGE SCREEN
════════════════════════════════════════════════ */
.challenge-layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 20px 24px 28px;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  overflow-y: auto;
}

.challenge-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.challenge-id {
  font-size: 12px;
  color: var(--color-accent);
  letter-spacing: 0.12em;
}

.challenge-title-text {
  font-size: 20px;
  font-weight: 600;
}

.challenge-type-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  padding: 2px 8px;
  border-radius: 2px;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  text-transform: uppercase;
  margin-left: auto;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ── Briefing ── */
.challenge-briefing {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.briefing-text {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

/* ── Briefing scenario ── */
.briefing-scenario {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-muted);
  font-style: italic;
  line-height: 1.6;
}

/* ── Learn more ── */
.learn-more-section {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.btn-learn-more {
  align-self: flex-start;
  background: transparent;
  border: 1px solid var(--color-accent-dim);
  border-radius: var(--radius);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  padding: 6px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background var(--transition), border-color var(--transition);
}
.btn-learn-more:hover {
  background: rgba(15,155,142,0.08);
  border-color: var(--color-accent);
}
.btn-learn-more:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.learn-more-chevron {
  display: inline-block;
  transition: transform 200ms ease;
  font-style: normal;
}
.learn-more-chevron.open {
  transform: rotate(180deg);
}

.learn-more-panel {
  margin-top: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-accent-dim);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.learn-more-text {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.7;
  white-space: pre-line;
}

/* ── Corpus ── */
.challenge-corpus {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.corpus-lines {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.corpus-line {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 5px 10px;
  border-radius: 3px;
  border-left: 3px solid transparent;
  transition: border-color var(--transition), background var(--transition);
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.6;
}

.corpus-line.must-match.line-matched {
  border-left-color: var(--color-success);
  background: rgba(76,175,80,0.06);
}

.corpus-line.must-match.line-unmatched {
  border-left-color: var(--color-failure);
  background: rgba(229,57,53,0.06);
}

.corpus-line.must-not-match.line-matched {
  border-left-color: var(--color-failure);
  background: rgba(229,57,53,0.06);
}

.corpus-line.must-not-match.line-ok {
  border-left-color: transparent;
}

.corpus-line .match-highlight {
  background: var(--color-match);
  color: var(--color-bg);
  border-radius: 2px;
  padding: 0 1px;
}

/* ── Regex input ── */
.challenge-input-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.regex-input {
  flex: 1;
  min-width: 200px;
  background: var(--color-surface2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 15px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.regex-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(15,155,142,0.2);
}

.char-counter {
  font-size: 12px;
  color: var(--color-muted);
  white-space: nowrap;
}

.char-counter.at-par  { color: var(--color-success); }
.char-counter.under-par { color: var(--color-match); }

.locked-in-indicator {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-success);
  opacity: 0;
  transition: opacity var(--transition);
  white-space: nowrap;
}
.locked-in-indicator.visible { opacity: 1; }

.regex-error {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-failure);
  min-height: 18px;
}

/* ── Actions ── */
.challenge-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.action-spacer { flex: 1; }

/* ── Hint panel ── */
.hint-panel {
  background: rgba(245,166,35,0.07);
  border: 1px solid rgba(245,166,35,0.3);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.hint-text {
  font-size: 14px;
  color: var(--color-match);
  line-height: 1.6;
}

/* ════════════════════════════════════════════════
   SUCCESS SCREEN
════════════════════════════════════════════════ */
.result-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  gap: 28px;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
}

.result-header { text-align: center; }

.result-status-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.success-label { color: var(--color-success); }
.failure-label { color: var(--color-failure); }

.result-challenge-id {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.1em;
}

/* ── Concept debrief ── */
.concept-debrief-card {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.concept-note-text {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text);
}

/* ── XP breakdown ── */
.xp-breakdown {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.xp-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.xp-row.xp-bonus-row { display: none; }
.xp-row.xp-bonus-row.visible { display: flex; }
.xp-row.xp-penalty-row { display: none; }
.xp-row.xp-penalty-row.visible { display: flex; }

.xp-value { font-weight: 700; }
.xp-gold  { color: var(--color-match); }
.xp-red   { color: var(--color-failure); }

.xp-total-row .xp-value {
  font-size: 20px;
  color: var(--color-success);
}

.xp-divider {
  height: 1px;
  background: var(--color-border);
  margin: 4px 0;
}

/* ── Par comparison line ── */
.par-line {
  font-size: 13px;
  color: var(--color-muted);
}
.par-line.under-par { color: var(--color-match); }
.par-line.at-par    { color: var(--color-success); }

/* ── XP count-up animation ── */
@keyframes xp-countup {
  from { opacity: 0.3; transform: scale(0.95); }
  to   { opacity: 1;   transform: scale(1); }
}
.xp-animate { animation: xp-countup 500ms ease forwards; }

/* ════════════════════════════════════════════════
   FAILURE SCREEN
════════════════════════════════════════════════ */
.failure-details {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-failure);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ════════════════════════════════════════════════
   WORLD COMPLETE SCREEN
════════════════════════════════════════════════ */
.world-complete-screen { text-align: center; }

.world-complete-icon {
  font-size: 64px;
  color: var(--color-boss);
  text-shadow: 0 0 30px rgba(245,166,35,0.6);
  margin-bottom: 8px;
}

.world-complete-title {
  font-size: 22px;
  font-weight: 600;
  margin-top: 8px;
}

.world-complete-xp {
  font-size: 16px;
  color: var(--color-match);
  margin-top: 4px;
}

/* ════════════════════════════════════════════════
   LEADERBOARD SCREEN
════════════════════════════════════════════════ */
.leaderboard-container {
  flex: 1;
  padding: 24px;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stub-badge {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.12em;
  padding: 3px 10px;
  border: 1px solid var(--color-match);
  color: var(--color-match);
  border-radius: 2px;
  align-self: flex-start;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.leaderboard-table th {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--color-muted);
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
}

.leaderboard-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(30,58,95,0.5);
}

.leaderboard-table tr.you-row {
  background: rgba(15,155,142,0.1);
}

.leaderboard-table tr.you-row td {
  color: var(--color-accent);
  font-weight: 600;
}

.rank-gold   { color: var(--color-match); font-family: var(--font-mono); font-weight: 700; }
.rank-silver { color: #c0c0c0;            font-family: var(--font-mono); }
.rank-bronze { color: #cd7f32;            font-family: var(--font-mono); }
.rank-other  { color: var(--color-muted); font-family: var(--font-mono); }

.stub-note { display: none; }

/* ════════════════════════════════════════════════
   STUB SCREENS (Regularcade + Gallery)
════════════════════════════════════════════════ */
.stub-screen-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 24px;
  gap: 16px;
  text-align: center;
}

.stub-lock-icon {
  font-size: 52px;
  color: var(--color-locked);
  margin-bottom: 8px;
}

.stub-screen-title {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.08em;
}

.stub-screen-sub {
  font-size: 14px;
  color: var(--color-muted);
  max-width: 400px;
}

.stub-unlock-msg {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  padding: 10px 18px;
  border: 1px solid var(--color-accent-dim);
  border-radius: var(--radius);
}

/* Arcade tiles */
.arcade-tiles {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  max-width: 720px;
  margin-top: 8px;
}

.arcade-tile {
  width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, opacity 0.15s;
}
.arcade-tile:hover {
  border-color: var(--color-accent-bright, #12c4b3);
}
.arcade-tile.locked {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: var(--color-border);
}

.arcade-tile-icon {
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--color-accent);
}
.arcade-tile.locked .arcade-tile-icon {
  color: var(--color-muted);
}

.arcade-tile-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 6px;
}

.arcade-tile-desc {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* Arcade game list */
.arcade-list-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px;
  gap: 24px;
  max-width: 640px;
  margin: 0 auto;
}
.arcade-list-header {
  text-align: center;
}
.arcade-list-icon {
  font-size: 32px;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.arcade-list-title {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 6px;
}
.arcade-list-sub {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
  max-width: 460px;
  margin: 0 auto;
}
.arcade-game-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}
.arcade-game-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}
.arcade-game-card.completed {
  border-left: 3px solid var(--color-accent);
}
.arcade-game-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  flex: 1 0 100%;
}
.arcade-game-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.4;
  flex: 1 1 100%;
}
.arcade-game-meta {
  font-size: 11px;
  color: var(--color-muted);
  flex: 1 1 auto;
}
.arcade-game-card .btn-sm {
  padding: 6px 16px;
  font-size: 11px;
}

/* Timed drill */
.td-timer {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 60px;
  text-align: right;
}
.td-timer.warning { color: var(--color-gold, #f5a623); }
.td-timer.danger  { color: var(--color-error, #e74c3c); }

.td-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  margin-bottom: 16px;
  overflow: hidden;
}
.td-progress-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.td-results-body {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 24px 0;
}
.td-results-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
}
.td-stat { text-align: center; }
.td-stat-label {
  font-size: 11px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}
.td-stat-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.td-flash {
  animation: td-flash-anim 0.4s ease;
}
@keyframes td-flash-anim {
  0%   { background-color: rgba(15, 155, 142, 0.2); }
  100% { background-color: transparent; }
}

/* Regex crossword */
.cw-play-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 24px 16px;
  max-width: 720px;
  margin: 0 auto;
}
.cw-instructions {
  font-size: 13px;
  text-align: center;
}
.cw-grid-container {
  overflow-x: auto;
  max-width: 100%;
}
.cw-table {
  border-collapse: separate;
  border-spacing: 4px;
}
.cw-pattern-col {
  font-size: 11px;
  color: var(--color-accent);
  text-align: center;
  padding: 4px 8px 8px;
  max-width: 120px;
  word-break: break-all;
  vertical-align: bottom;
}
.cw-pattern-row {
  font-size: 11px;
  color: var(--color-accent);
  text-align: right;
  padding: 8px 12px 8px 4px;
  white-space: nowrap;
}
.cw-cell-wrap {
  padding: 0;
}
.cw-cell {
  width: 48px;
  height: 48px;
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm, 4px);
  outline: none;
  transition: border-color 0.2s, background-color 0.2s;
  caret-color: var(--color-accent);
}
.cw-cell:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(15, 155, 142, 0.25);
}
.cw-cell.cw-valid {
  border-color: var(--color-success, #2ecc71);
  background: rgba(46, 204, 113, 0.1);
}
.cw-cell.cw-invalid {
  border-color: var(--color-error, #e74c3c);
  background: rgba(231, 76, 60, 0.1);
}
.cw-error-count {
  font-size: 12px;
  color: var(--color-muted);
}
.cw-replay-note {
  font-size: 12px;
  text-align: center;
  margin-top: 8px;
}

/* Gallery halls */
.gallery-halls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  max-width: 720px;
  margin-top: 8px;
}

.gallery-hall-card {
  width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  text-align: center;
  opacity: 0.6;
}

.gallery-hall-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.gallery-hall-desc {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.5;
}

.stub-coming-soon {
  margin-top: 20px;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--color-locked);
}

/* ── World narrative band ── */
.world-narrative-band {
  padding: 8px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.world-narrative-text {
  font-size: 15px;
  color: var(--color-text);
  font-style: italic;
  line-height: 1.5;
}

/* ── Reference solution card ── */
.reference-solution-card {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-muted);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.reference-solution-code {
  display: block;
  margin-top: 8px;
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-accent);
  word-break: break-all;
  line-height: 1.6;
}

/* ════════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════════ */
@media (max-width: 600px) {
  .challenge-layout { padding: 14px 14px 24px; gap: 14px; }
  .input-row { flex-direction: column; align-items: stretch; }
  .challenge-actions { flex-wrap: wrap; }
  .action-spacer { display: none; }
  .result-screen { padding: 24px 14px; }
  .title-nav { width: 100%; max-width: 300px; }
}

/* ════════════════════════════════════════════════
   UTILITY
════════════════════════════════════════════════ */
.hidden { display: none !important; }

/* ════════════════════════════════════════════════
   AUTH MODAL
════════════════════════════════════════════════ */
.auth-modal {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 20, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.auth-modal-inner {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  width: min(400px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}

.auth-tab {
  flex: 1;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 8px;
  cursor: pointer;
  transition: var(--transition);
}

.auth-tab.active,
.auth-tab:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.auth-input {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 12px;
  width: 100%;
  outline: none;
  transition: var(--transition);
}

.auth-input:focus { border-color: var(--color-accent); }
.auth-input::placeholder { color: var(--color-muted); }

.auth-remember {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--color-muted);
  cursor: pointer;
  user-select: none;
}

.auth-error {
  color: var(--color-failure);
  font-size: 12px;
  min-height: 16px;
}

.btn-wide { width: 100%; }