:root {
  --color-bg: #0f172a;
  --color-panel: #1e293b;
  --color-border: #334155;
  --color-text: #f1f5f9;
  --color-muted: #94a3b8;
  --color-accent: #38bdf8;
  --color-complete: #22c55e;
  --color-free: #facc15;
  --color-line-glow: rgba(56, 189, 248, 0.6);
  --color-bingo: #facc15;
  --color-bingo-glow: rgba(250, 204, 21, 0.55);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: var(--color-text);
  display: flex;
  justify-content: center;
  padding: 24px 16px 48px;
}

.app {
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.header-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.nav-buttons {
  display: flex;
  gap: 8px;
}

/* The logo's letters are cut out of the blue badge, so give them a white backing.
   border-radius matches the badge's own corner rounding (~7.2/35 of its height) so the
   white backing doesn't peek out past the badge's more-rounded corners. */
.brand-logo {
  display: block;
  height: 32px;
  width: auto;
  background: #fff;
  border-radius: 7px;
}

.nav-button {
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.1s ease;
}

.nav-button:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.app-header h1 {
  margin: 0;
  font-size: 2.2rem;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--color-muted);
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.score-card {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.score-card.total {
  border-color: var(--color-accent);
  box-shadow: 0 0 12px var(--color-line-glow);
}

.score-label {
  font-size: 0.75rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.score-value {
  font-size: 1.4rem;
  font-weight: 700;
}

.progress {
  display: flex;
  justify-content: center;
  gap: 24px;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.bingo-letters {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  text-align: center;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent);
}

.board {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.square {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--color-panel);
  border: 2px solid var(--color-border);
  border-radius: 10px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.square:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

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

.square .task {
  font-size: 0.75rem;
  line-height: 1.2;
}

.square .link-hint {
  display: block;
  margin-top: 4px;
  font-size: 0.72rem;
  font-style: italic;
  color: var(--color-accent);
}

.square .points {
  margin-top: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-accent);
}

.square.completed {
  background: rgba(34, 197, 94, 0.18);
  border-color: var(--color-complete);
}

.square.completed .points {
  color: var(--color-complete);
}

.square.free-space {
  background: rgba(250, 204, 21, 0.18);
  border-color: var(--color-free);
  font-weight: 700;
  cursor: default;
}

.square.free-space .task {
  font-size: 0.85rem;
}

.square.in-line {
  border-color: var(--color-bingo);
  box-shadow: 0 0 10px var(--color-bingo-glow);
}

.square.in-line.completed::after {
  color: var(--color-bingo);
}

.square.line-new {
  animation: line-pulse 0.9s ease-out 2;
}

@keyframes line-pulse {
  0%, 100% { transform: scale(1); }
  40% { transform: scale(1.06); box-shadow: 0 0 22px var(--color-bingo-glow); }
}

.board-wrapper {
  position: relative;
}

.line-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.line-overlay line {
  stroke: var(--color-bingo);
  stroke-width: 6;
  stroke-linecap: round;
  opacity: 0.55;
}

.line-overlay line.new {
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: line-draw 0.6s ease-out forwards;
}

@keyframes line-draw {
  to { stroke-dashoffset: 0; }
}

.bingo-toast {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 36px;
  background: var(--color-panel);
  border: 2px solid var(--color-bingo);
  border-radius: 16px;
  box-shadow: 0 0 40px var(--color-bingo-glow), 0 12px 32px rgba(0, 0, 0, 0.5);
  text-align: center;
  cursor: pointer;
  transform: translate(-50%, -50%) scale(0.6);
  opacity: 0;
}

.bingo-toast[hidden] {
  display: none;
}

.bingo-toast.show {
  animation: toast-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes toast-pop {
  to { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.bingo-toast-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-bingo);
}

.bingo-toast-title::before,
.bingo-toast-title::after {
  content: "🎉";
  margin: 0 10px;
}

.bingo-toast-detail {
  font-size: 1rem;
  color: var(--color-text);
}

@media (prefers-reduced-motion: reduce) {
  .square.line-new,
  .line-overlay line.new {
    animation: none;
    stroke-dashoffset: 0;
  }

  .bingo-toast.show {
    animation: none;
    transform: translate(-50%, -50%);
    opacity: 1;
  }
}

.help-hint {
  margin: 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-accent);
  font: inherit;
  text-decoration: underline;
  cursor: pointer;
}

.help-dialog {
  max-width: 520px;
  width: calc(100% - 32px);
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 24px 28px;
}

.help-dialog::backdrop {
  background: rgba(15, 23, 42, 0.75);
}

.help-dialog h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.help-dialog li {
  margin-bottom: 8px;
  line-height: 1.4;
}

.help-dialog a {
  color: var(--color-accent);
}

.help-dialog .dialog-link {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--color-accent);
  color: var(--color-bg, #0b1120);
  font-weight: 700;
  text-decoration: none;
}

.help-dialog .dialog-link:hover {
  filter: brightness(1.1);
}

.help-dialog form {
  display: flex;
  justify-content: flex-end;
  margin-top: 16px;
}

.square.completed::after {
  content: "✓";
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 0.9rem;
  color: var(--color-complete);
}

.player {
  margin: 8px 0 0;
  color: var(--color-muted);
}

.save-status {
  min-height: 1.5em;
  margin: 12px 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.save-status[data-state="error"] {
  color: #f87171;
}

#save-retry-btn {
  margin-left: 8px;
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 4px 12px;
  cursor: pointer;
}

#save-retry-btn:hover {
  border-color: var(--color-accent);
}

.app-footer {
  display: flex;
  justify-content: center;
  gap: 12px;
}

#reset-btn,
#signout-btn {
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  cursor: pointer;
}

#reset-btn:hover,
#signout-btn:hover {
  border-color: var(--color-accent);
}

.leaderboard-page .app-header {
  margin-bottom: 6px;
}

.leaderboard-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tab-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-button {
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 9px 16px;
  cursor: pointer;
  font-weight: 600;
}

.tab-button.active {
  background: var(--color-accent);
  color: #0f172a;
  border-color: var(--color-accent);
}

.leaderboard-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.last-updated {
  color: var(--color-muted);
  font-size: 0.8rem;
  min-width: 90px;
  text-align: right;
}

.result-picker select {
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 0.9rem;
}

.result-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.result-picker select {
  background: var(--color-panel);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 8px 10px;
}

.leaderboard-table-wrapper {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

.leaderboard-table th,
.leaderboard-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.leaderboard-table th {
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.72rem;
}

.leaderboard-table tbody tr:hover {
  background: rgba(56, 189, 248, 0.08);
}

.leaderboard-table tbody tr:last-child td {
  border-bottom: none;
}

.rank-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.15);
  color: var(--color-accent);
  font-weight: 700;
}

@media (max-width: 600px) {
  .square .task {
    font-size: 0.62rem;
  }

  .bingo-letters {
    font-size: 1.1rem;
  }
}