:root {
  --green: #6aaa64;
  --yellow: #c9b458;
  --gray: #787c7e;
  --dark: #000;
  --light: #fff;
  --tile-empty-border: #d3d6da;
  --tile-flip: #d3d6da;
  --key-bg: #dadbdd;
  --radius: 4px;
  --tile-size: min(14vw, 62px);
  --gap: 6px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--dark);
  color: var(--light);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid #333;
}

.topbar h1 {
  font-size: clamp(20px, 5vw, 30px);
  letter-spacing: 4px;
  margin: 0;
  text-align: center;
}

.topbar-side {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-side.right {
  justify-content: flex-end;
}

.nav-btn {
  border: 1px solid var(--gray);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--light);
  text-decoration: none;
  cursor: pointer;
  background: transparent;
}

.nav-btn:hover {
  border-color: var(--light);
}

#dateInput {
  background: #111;
  color: var(--light);
  border: 1px solid var(--gray);
  border-radius: var(--radius);
  padding: 5px 8px;
  font: inherit;
  font-size: 13px;
  color-scheme: dark;
}

.puzzle-no {
  font-size: 13px;
  color: #b0b3b5;
}

main {
  flex: 1;
  width: 100%;
  max-width: 540px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.dayline {
  font-size: 13px;
  color: #b0b3b5;
  margin: 0 0 14px;
  text-align: center;
  min-height: 18px;
}

.board {
  display: grid;
  grid-template-rows: repeat(6, 1fr);
  gap: var(--gap);
  margin-bottom: 18px;
}

.row {
  display: grid;
  grid-template-columns: repeat(5, var(--tile-size));
  gap: var(--gap);
  justify-content: center;
}

.tile {
  width: var(--tile-size);
  height: var(--tile-size);
  border: 2px solid var(--tile-empty-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--tile-size) * 0.55);
  font-weight: 700;
  text-transform: uppercase;
  user-select: none;
}

.tile.filled {
  border-color: var(--gray);
  animation: pop 120ms ease;
}

.tile.reveal {
  border-color: transparent;
  animation: flip 500ms ease forwards;
}

.tile.green {
  background: var(--green);
}

.tile.yellow {
  background: var(--yellow);
}

.tile.gray {
  background: var(--gray);
}

.tile.wrong {
  animation: shake 400ms ease;
}

.tile.win {
  animation: bounce 600ms ease;
}

@keyframes pop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes shake {
  10%,
  90% {
    transform: translateX(-2px);
  }
  20%,
  80% {
    transform: translateX(4px);
  }
  30%,
  50%,
  70% {
    transform: translateX(-6px);
  }
  40%,
  60% {
    transform: translateX(6px);
  }
}

@keyframes flip {
  0% {
    transform: rotateX(0);
    background: var(--tile-flip);
  }
  50% {
    transform: rotateX(-90deg);
    background: var(--tile-flip);
  }
  100% {
    transform: rotateX(0);
  }
}

@keyframes bounce {
  0%,
  20% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-14px);
  }
  60% {
    transform: translateY(4px);
  }
  80% {
    transform: translateY(-6px);
  }
  100% {
    transform: translateY(0);
  }
}

.toast-area {
  position: fixed;
  top: 72px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.toast {
  background: var(--light);
  color: var(--dark);
  font-weight: 700;
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  animation: toastIn 180ms ease;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.keyboard {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.kb-row {
  display: flex;
  justify-content: center;
  gap: 5px;
}

.key {
  background: var(--key-bg);
  color: var(--dark);
  border: 0;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0;
  height: 52px;
  flex: 1.1;
  min-width: 22px;
  cursor: pointer;
  transition:
    background 200ms ease,
    color 200ms ease;
}

.key.wide {
  flex: 1.6;
  font-size: 12px;
}

.key.green {
  background: var(--green);
  color: var(--light);
}

.key.yellow {
  background: var(--yellow);
  color: var(--light);
}

.key.gray {
  background: var(--gray);
  color: var(--light);
}

.key:active {
  transform: translateY(1px);
}

.foot {
  padding: 14px 16px 22px;
  text-align: center;
  font-size: 12px;
  color: #8e9193;
}

.foot code {
  color: #b8bbbd;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
  padding: 16px;
}

.modal[hidden] {
  display: none;
}

.modal-card {
  background: var(--light);
  color: var(--dark);
  border-radius: 8px;
  padding: 22px;
  width: min(420px, 100%);
  text-align: center;
}

.modal-card h2 {
  margin: 0 0 6px;
  font-size: 22px;
}

.modal-card p {
  margin: 0 0 16px;
  font-size: 14px;
  color: #333;
}

.share-grid {
  display: grid;
  grid-template-columns: repeat(5, 22px);
  gap: 4px;
  justify-content: center;
  margin-bottom: 18px;
}

.share-cell {
  width: 22px;
  height: 22px;
  border-radius: 3px;
  border: 1px solid #d3d6da;
}

.share-cell.green {
  background: var(--green);
}
.share-cell.yellow {
  background: var(--yellow);
}
.share-cell.gray {
  background: var(--gray);
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  background: #dadbdd;
  color: var(--dark);
}

.btn.primary {
  background: var(--green);
  color: var(--light);
}

@media (max-width: 420px) {
  :root {
    --tile-size: 16vw;
  }
  .key {
    height: 44px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .board .tile,
  .board .tile.reveal,
  .board .tile.wrong,
  .board .tile.win,
  .toast-area .toast {
    animation: none;
  }
  .board .tile.reveal {
    border-color: transparent;
  }
}