:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1b;
  --muted: #6b6b6b;
  --tile-bg: #efefe6;
  --tile-selected: #1a1a1b;
  --tile-selected-fg: #ffffff;
  --border: #d3d3d3;
  --card-bg: #f7f7f7;

  --yellow: #f9df6d;
  --green: #a0c35a;
  --blue: #b0c4ef;
  --purple: #ba81c5;

  --safe: #6aaa64;
  --warm: #c9b458;
  --hot: #e08214;
  --loss: #d64545;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121213;
    --fg: #f2f2f2;
    --muted: #a3a3a3;
    --tile-bg: #2b2b2c;
    --tile-selected: #f2f2f2;
    --tile-selected-fg: #121213;
    --border: #3a3a3c;
    --card-bg: #1c1c1d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  justify-content: center;
  padding: 24px 16px 60px;
}

#app {
  width: 100%;
  max-width: 560px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  margin: 0 0 6px;
  letter-spacing: 0.5px;
}

header p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

#status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 18px 0 12px;
  font-size: 14px;
  color: var(--muted);
}

#status-bar strong {
  color: var(--fg);
  font-size: 14px;
  font-weight: 700;
}

.solved-groups {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}

.solved-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.chip {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4px 6px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.3px;
  color: #1a1a1b;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}

.chip-yellow { background: var(--yellow); }
.chip-green  { background: var(--green); }
.chip-blue   { background: var(--blue); }
.chip-purple { background: var(--purple); }

.chip-solved {
  background: var(--tile-selected);
  color: var(--tile-selected-fg);
}

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.tile {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4px 6px;
  background: var(--tile-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.3px;
  cursor: pointer;
  user-select: none;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
  transition: transform 0.08s ease, background 0.15s ease, color 0.15s ease;
}

.tile:hover:not(.disabled) {
  transform: translateY(-1px);
}

.tile.selected {
  background: var(--tile-selected);
  color: var(--tile-selected-fg);
  border-color: var(--tile-selected);
}

.tile.disabled {
  cursor: default;
  opacity: 0.55;
}

.tile.reveal-yellow { background: var(--yellow); color: #1a1a1b; border-color: var(--yellow); }
.tile.reveal-green  { background: var(--green);  color: #1a1a1b; border-color: var(--green); }
.tile.reveal-blue   { background: var(--blue);   color: #1a1a1b; border-color: var(--blue); }
.tile.reveal-purple { background: var(--purple); color: #1a1a1b; border-color: var(--purple); }

#controls {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
}

button {
  font-family: inherit;
  font-weight: 700;
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 20px;
  border: 1px solid var(--fg);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

button:disabled {
  opacity: 0.35;
  cursor: default;
}

button.primary {
  background: var(--fg);
  color: var(--bg);
}

#history {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.guess-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}

.guess-words {
  flex: 1;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
}

.badge {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 12px;
  color: #1a1a1b;
  white-space: nowrap;
}

.badge.overlap-1 { background: var(--safe); color: #fff; }
.badge.overlap-2 { background: var(--warm); }
.badge.overlap-3 { background: var(--hot); color: #fff; }
.badge.overlap-4 { background: var(--loss); color: #fff; }

#result {
  text-align: center;
  padding: 16px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

#result.hidden { display: none; }

#result h2 { margin: 0 0 8px; }
#result p { margin: 4px 0; color: var(--muted); }

.reveal-categories {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
  text-align: left;
}

.reveal-category {
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
}

.reveal-category b { display: block; font-size: 11px; letter-spacing: 0.5px; opacity: 0.75; }
.reveal-category.cat-yellow { background: var(--yellow); color: #1a1a1b; }
.reveal-category.cat-green  { background: var(--green);  color: #1a1a1b; }
.reveal-category.cat-blue   { background: var(--blue);   color: #1a1a1b; }
.reveal-category.cat-purple { background: var(--purple); color: #1a1a1b; }

details {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

details summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--fg);
}

#share-btn {
  margin-top: 14px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  width: 100%;
  max-width: 360px;
}

.modal h3 {
  margin: 0 0 12px;
}

.modal pre {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 20px;
  line-height: 1.3;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0 0 14px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

#splash {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: #b9a8ec;
  color: #1a1a1b;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

#splash.hidden {
  display: none;
}

.splash-topbar {
  background: #ffffff;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

.splash-menu {
  position: absolute;
  left: 20px;
  font-size: 22px;
}

.splash-logo {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 22px;
}

.splash-logo-letter {
  font-family: "Snell Roundhand", "Brush Script MT", cursive;
  font-size: 26px;
}

.splash-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 60px 24px 32px;
}

.splash-icon {
  width: 90px;
  height: 90px;
  margin-bottom: 28px;
}

.splash-title {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 800;
  font-size: 40px;
  margin: 0 0 10px;
}

.splash-tagline {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  margin: 0 0 40px;
}

.splash-btn {
  width: 100%;
  max-width: 260px;
  padding: 14px;
  border-radius: 24px;
  font-weight: 700;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  margin-bottom: 14px;
}

.splash-btn-primary {
  background: #1a1a1b;
  color: #fff;
  border: 1px solid #1a1a1b;
}

.splash-btn-outline {
  background: transparent;
  color: #1a1a1b;
  border: 1px solid #1a1a1b;
}

.splash-toast {
  min-height: 18px;
  font-size: 13px;
  font-style: italic;
  opacity: 0;
  transition: opacity 0.2s ease;
  margin: 0 0 10px;
}

.splash-toast.visible {
  opacity: 1;
}

.splash-footer {
  margin-top: auto;
  padding-top: 30px;
  font-weight: 700;
}

.splash-number,
.splash-byline {
  font-weight: 400;
  margin-top: 2px;
}