:root {
  --paper: #f7f1da;
  --card: #fffdf4;
  --ink: #2b271f;
  --muted: #666152;
  --line: rgba(43, 39, 31, 0.18);
  --olive: #486a2e;
  --olive-soft: #e8f5dc;
  --tile: #f9e3a6;
  --danger: #7f2622;
  --danger-soft: #fbe6e4;
  --control-height: 54px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(96, 86, 58, 0.045) 0,
      rgba(96, 86, 58, 0.045) 2px,
      transparent 2px,
      transparent 34px
    ),
    var(--paper);
  color: var(--ink);
  font-family: "Nunito", sans-serif;
  padding: 24px;
}

.loader-screen {
  max-width: 430px;
  margin: 8vh auto 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 28px rgba(58, 49, 30, 0.12);
  padding: 24px;
  display: grid;
  justify-items: center;
  gap: 12px;
  text-align: center;
}

.spinner {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 4px solid rgba(72, 106, 46, 0.22);
  border-top-color: var(--olive);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loader-title {
  margin: 0;
  font-family: "Kalam", cursive;
  font-size: 1.8rem;
}

.loader-message {
  margin: 0;
  color: var(--muted);
}

.board {
  max-width: 1140px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 290px;
  gap: 14px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 28px rgba(58, 49, 30, 0.12);
}

.play {
  padding: 18px;
  display: grid;
  gap: 10px;
}

h1 {
  margin: 0;
  font-family: "Kalam", cursive;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
}

.sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.rule {
  margin: 0;
  line-height: 1.25;
}

select,
input,
button {
  font: inherit;
}

select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 4px 8px;
  background: #fff;
}

.lane {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
}

.tiles {
  display: flex;
  gap: 10px;
}

.tile {
  width: 70px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--tile);
  border: 1px solid #bf943a;
  border-radius: 9px;
  box-shadow: 3px 3px 0 #bf943a;
  font-family: "Kalam", cursive;
  font-size: 2rem;
  font-weight: 700;
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease;
}

.tile.matched {
  background: linear-gradient(180deg, #c9f5b5 0%, #a7e190 100%);
  border-color: #5e9f50;
  box-shadow: 3px 3px 0 #5e9f50;
  color: #23471d;
}

.tip {
  border-left: 2px solid var(--olive);
  padding-left: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.entry {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  align-items: center;
}

.input-wrap {
  position: relative;
  height: var(--control-height);
}

.input-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #fff;
  height: 100%;
  padding: 13px 44px 13px 13px;
  line-height: 1.2;
  margin: 0;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

input:focus,
select:focus {
  outline: 2px solid rgba(72, 106, 46, 0.28);
  outline-offset: 1px;
}

.feedback-icon {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 12px;
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 800;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    color 0.2s ease;
}

.feedback-icon::before {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  line-height: 1;
}

.input-wrap.feedback-success input {
  border-color: #5e9f50;
  box-shadow: 0 0 0 2px rgba(94, 159, 80, 0.15);
}

.input-wrap.feedback-success .feedback-icon {
  opacity: 1;
  color: #2f7a24;
}

.input-wrap.feedback-success .feedback-icon::before {
  content: "✓";
}

.input-wrap.feedback-error input {
  border-color: #b24a40;
  box-shadow: 0 0 0 2px rgba(178, 74, 64, 0.16);
}

.input-wrap.feedback-error .feedback-icon {
  opacity: 1;
  color: var(--danger);
}

.input-wrap.feedback-error .feedback-icon::before {
  content: "✕";
}

button {
  border: 0;
  border-radius: 11px;
  cursor: pointer;
  font-weight: 800;
  padding: 11px 16px;
}

.entry button {
  height: var(--control-height);
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  margin: 0;
}

button:disabled,
input:disabled,
select:disabled {
  opacity: 0.58;
  cursor: not-allowed;
}

.primary {
  background: var(--olive);
  color: #fff;
}

.ghost {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.system-message {
  margin: 0;
  background: var(--danger-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  border-color: rgba(127, 38, 34, 0.24);
  color: var(--danger);
  font-weight: 700;
  padding: 9px 11px;
}

.system-message:empty {
  display: none;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 11px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-family: "Kalam", cursive;
}

.solutions-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.solutions-head h2 {
  margin: 0;
}

.card ul,
.card .solutions {
  margin: 0;
  padding-left: 18px;
}

.card li {
  margin: 4px 0;
}

.card.wide {
  grid-column: 1 / -1;
}

.solutions {
  max-height: 280px;
  overflow: auto;
}

.solution-word {
  font-weight: 700;
}

.solution-meaning {
  color: var(--muted);
}

.rail {
  padding: 14px;
  position: sticky;
  top: 20px;
  height: fit-content;
  display: grid;
  gap: 10px;
}

.stat {
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 9px;
}

.stat b {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.stat span {
  font-size: 1.5rem;
  font-weight: 800;
}

.controls-panel {
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
  display: grid;
  gap: 8px;
}

.controls-title {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.control-field {
  display: grid;
  gap: 4px;
}

.control-field label {
  font-size: 0.82rem;
  color: var(--muted);
}

.control-field select {
  width: 100%;
}

.check {
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  font-size: 0.9rem;
  color: var(--muted);
  display: grid;
  gap: 6px;
}

@media (max-width: 920px) {
  body {
    padding: 14px;
  }

  .board {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .controls-panel {
    grid-column: 1 / -1;
  }

  .check {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  body {
    padding: 10px;
  }

  .play {
    gap: 8px;
  }

  .rule {
    line-height: 1.3;
  }

  .lane {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .entry {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .cards {
    grid-template-columns: 1fr;
    margin-top: 0;
  }

  .rail {
    grid-template-columns: 1fr;
  }
}