:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #1a1a1b;
  --muted: #62666a;
  --line: #d3d6da;
  --line-strong: #878a8c;
  --panel: #f4f5f6;
  --key: #d3d6da;
  --key-fg: #1a1a1b;
  --green: #6aaa64;
  --yellow: #c9b458;
  --gray: #787c7e;
  --on-tile: #ffffff;
  --focus: #2f6fde;
  --warn: #9a6b00;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #121213;
    --fg: #f2f2f2;
    --muted: #a3a6a9;
    --line: #3a3a3c;
    --line-strong: #5f6062;
    --panel: #1c1c1e;
    --key: #818384;
    --key-fg: #ffffff;
    --green: #538d4e;
    --yellow: #b59f3b;
    --gray: #3a3a3c;
    --focus: #7aa7ff;
    --warn: #e0b54a;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

button:disabled {
  cursor: default;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

.app {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 500px;
  margin: 0 auto;
  padding: 24px 16px calc(24px + env(safe-area-inset-bottom));
}

/* ---------- Header ---------- */

.masthead {
  text-align: center;
}

.masthead h1 {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.lede {
  margin: 4px auto 0;
  max-width: 34ch;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.board {
  display: grid;
  gap: 6px;
  width: min(100%, 320px);
  margin: 4px auto 0;
}

.row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.tile {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  padding: 0;
  border: 2px solid var(--line);
  border-radius: 3px;
  background: transparent;
  font-size: clamp(1.5rem, 8vw, 2rem);
  font-weight: 800;
  line-height: 1;
  text-transform: uppercase;
  user-select: none;
}

.tile.next {
  border-color: var(--line-strong);
}

.tile[data-color] {
  border-color: transparent;
  color: var(--on-tile);
}

.tile[data-color="b"] {
  background: var(--gray);
}

.tile[data-color="y"] {
  background: var(--yellow);
}

.tile[data-color="g"] {
  background: var(--green);
}

/* Editable tiles in the current row */
button.tile {
  transition: transform 80ms ease;
  box-shadow: inset 0 -4px 0 rgb(0 0 0 / 0.14);
}

@media (hover: hover) {
  button.tile:hover {
    transform: translateY(-2px);
  }
}

button.tile:active {
  transform: scale(0.96);
}

.tile.pop {
  animation: pop 110ms ease-out;
}

.tile.reveal {
  animation: flip 420ms ease-in-out both;
  animation-delay: calc(var(--i) * 90ms);
}

.row.shake {
  animation: shake 360ms ease-in-out;
}

@keyframes pop {
  50% {
    transform: scale(1.1);
  }
}

@keyframes flip {
  0% {
    transform: rotateX(0);
    background: transparent;
    border-color: var(--line-strong);
    color: var(--fg);
  }
  49% {
    background: transparent;
    border-color: var(--line-strong);
    color: var(--fg);
  }
  50% {
    transform: rotateX(-90deg);
  }
  100% {
    transform: rotateX(0);
  }
}

@keyframes shake {
  20%,
  60% {
    transform: translateX(-6px);
  }
  40%,
  80% {
    transform: translateX(6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tile.pop,
  .tile.reveal,
  .row.shake {
    animation: none;
  }
}

.status {
  min-height: 1.5em;
  margin: -4px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  gap: 8px;
}

.btn {
  height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
}

.btn-primary {
  flex: 1;
  border-color: transparent;
  background: var(--green);
  color: #fff;
}

.btn:disabled {
  opacity: 0.45;
}

@media (hover: hover) {
  .btn:not(:disabled):hover {
    border-color: var(--line-strong);
  }

  .btn-primary:not(:disabled):hover {
    filter: brightness(1.06);
  }
}

/* ---------- Suggestions ---------- */

.panel {
  padding: 16px;
  border-radius: 12px;
  background: var(--panel);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  margin-bottom: 12px;
}

.panel-head h2 {
  margin: 0;
  font-size: 1rem;
}

.count {
  color: var(--muted);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip,
.word {
  border: 1px solid var(--line);
  background: var(--bg);
  font-family: var(--mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 1rem;
}

.chip.best {
  border: 2px solid var(--green);
  padding: 5px 11px;
}

.chip.eliminator {
  border-color: var(--yellow);
}

.badge {
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--yellow);
  color: #fff;
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: none;
}

@media (hover: hover) {
  .chip:hover,
  .word:hover {
    border-color: var(--line-strong);
  }
}

.note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

#suggestions > .note:first-child {
  margin-top: 0;
}

.note b {
  color: var(--fg);
}

.note.warn {
  color: var(--warn);
}

.all-words {
  margin-top: 12px;
}

.all-words summary,
.about summary {
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 6px;
  max-height: 240px;
  margin-top: 10px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.word {
  padding: 6px 0;
  border-radius: 6px;
  font-size: 0.8rem;
}

/* ---------- Keyboard ---------- */

.keyboard {
  display: grid;
  gap: 8px;
  user-select: none;
}

.key-row {
  display: flex;
  justify-content: center;
  gap: 6px;
}

.key {
  flex: 1;
  max-width: 44px;
  height: 56px;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: var(--key);
  color: var(--key-fg);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
}

.key.wide {
  flex: 1.5;
  max-width: 66px;
  font-size: 0.75rem;
}

.key[data-color] {
  color: #fff;
}

.key[data-color="b"] {
  background: var(--gray);
}

.key[data-color="y"] {
  background: var(--yellow);
}

.key[data-color="g"] {
  background: var(--green);
}

.key-row:nth-child(2) {
  padding: 0 5%;
}

/* On phones, keep the keyboard in reach while the board and suggestions scroll */
@media (pointer: coarse) {
  .keyboard {
    position: sticky;
    bottom: 0;
    z-index: 1;
    margin: 0 -16px;
    padding: 10px 8px calc(10px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: var(--bg);
  }
}

@media (max-width: 360px) {
  .key-row {
    gap: 4px;
  }

  .key {
    height: 50px;
  }
}

/* ---------- About & footer ---------- */

.about {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.about p {
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.about p.note {
  font-size: 0.85rem;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}