:root {
  --bg: radial-gradient(circle at 15% 15%, #fff6de 0%, #f7e8cb 48%, #eedab3 100%);
  --panel: #fffaf0;
  --panel-border: #d6c5a1;
  --text: #3c2f1e;
  --muted: #6c5d45;
  --focus: #2b6cb0;
  --gap: 0.55rem;
  --radius: 0.95rem;
  --shadow: 0 16px 34px rgba(54, 39, 14, 0.15);
  --section-gap: 0.55rem;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  height: 100vh;
  font-family: "Trebuchet MS", "Avenir Next", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 0.75rem;
  overflow: hidden;
}

.app {
  width: min(100%, 900px);
  height: calc(100vh - 1.5rem);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.app-header p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: var(--section-gap);
}

.control {
  display: grid;
  gap: 0.35rem;
  min-width: 140px;
  width: 100%;
}

.control span {
  font-weight: 700;
  font-size: 0.92rem;
}

.control-inline {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.control-inline span {
  white-space: nowrap;
}

.control-inline .difficulty-buttons {
  flex: 1;
}

select {
  border: 1px solid #b99d69;
  border-radius: 0.55rem;
  padding: 0.55rem 0.7rem;
  font: inherit;
  color: inherit;
  background: #fffdf6;
}

.difficulty-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.45rem;
}

.difficulty-btn {
  border: 1px solid #c4b086;
  border-radius: 0.58rem;
  background: #fffdf6;
  color: #3c2f1e;
  padding: 0.5rem 0.36rem;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.28rem;
  white-space: nowrap;
}

.difficulty-btn:hover {
  background: #fff8e6;
}

.difficulty-btn.active {
  box-shadow: inset 0 0 0 2px var(--diff-accent, #2f7b73);
  border-color: var(--diff-accent, #2f7b73);
  background: var(--diff-bg, #fff6d9);
  color: var(--diff-text, #3c2f1e);
}

.difficulty-btn.active[data-size-id="size1"] {
  --diff-accent: #d6aa2a;
  --diff-bg: #fff3bf;
  --diff-text: #5a470f;
}

.difficulty-btn.active[data-size-id="size2"] {
  --diff-accent: #d8892b;
  --diff-bg: #ffe2b8;
  --diff-text: #5f3510;
}

.difficulty-btn.active[data-size-id="size3"] {
  --diff-accent: #cc5b2a;
  --diff-bg: #ffd0b8;
  --diff-text: #5a2512;
}

.difficulty-btn.active[data-size-id="size4"] {
  --diff-accent: #c43b2b;
  --diff-bg: #ffc0b8;
  --diff-text: #55140f;
}

.hotkey-chip {
  border: none;
  background: rgba(226, 236, 248, 0.45);
  color: rgba(55, 78, 107, 0.7);
  border-radius: 0.32rem;
  font-size: 0.72em;
  font-weight: 700;
  padding: 0.12em 0.42em;
  line-height: 1.2;
}

.message {
  min-height: 0;
  margin: var(--section-gap) 0;
  color: #8f2a22;
  font-size: 0.93rem;
}

.clue-panel {
  display: grid;
  gap: 0.35rem;
  margin-bottom: var(--section-gap);
}

.clue-inline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.6rem;
  align-items: center;
  background: rgba(0, 0, 0, 0.08);
  border-radius: 0.6rem;
  padding: 0.45rem 0.55rem 0.45rem 0.8rem;
}

.clue-prompt {
  margin: 0;
  font-weight: 700;
  color: #2f4966;
  text-align: left;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  width: 100%;
}

.candidate-count {
  margin: 0;
  font-size: 0.9rem;
  color: #5a6f87;
}

.proposed-layout-label {
  margin: 0;
  font-size: 0.9rem;
  color: #35577c;
}

.clue-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0;
  justify-content: flex-end;
}

.clue-actions button {
  border: 1px solid #9bb3cd;
  border-radius: 0.45rem;
  background: #f5f9ff;
  color: #2c4560;
  padding: 0.38rem 0.65rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.clue-actions button:disabled {
  opacity: 0.45;
  cursor: default;
}

.generated-layout {
  grid-column: 1 / -1;
  margin: 0.3rem 0 0;
  padding: 0.45rem 0.55rem;
  border: 1px solid #bbcad8;
  border-radius: 0.45rem;
  background: #f5f8fc;
  color: #28415d;
  font-size: 0.84rem;
  line-height: 1.35;
  white-space: pre-wrap;
}

.layout-hidden {
  display: none;
}

.board-wrap {
  flex: 1;
  min-height: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.hotkey-popup {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%) translateY(14px);
  opacity: 0;
  pointer-events: none;
  background: #1f2f43;
  color: #f4f8ff;
  border: 1px solid #4a6583;
  border-radius: 0.7rem;
  box-shadow: 0 10px 24px rgba(8, 18, 31, 0.32);
  padding: 0.7rem 0.95rem;
  transition:
    opacity 150ms ease,
    transform 150ms ease;
  z-index: 20;
}

.hotkey-popup p {
  margin: 0;
  font-size: 0.93rem;
  white-space: nowrap;
}

.hotkey-popup.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.app-footer {
  margin-top: 0.45rem;
  text-align: center;
  font-size: 0.84rem;
  color: #6e6658;
}

.app-footer a {
  color: #35577c;
  font-weight: 700;
  text-decoration: none;
}

.app-footer a:hover,
.app-footer a:focus-visible {
  text-decoration: underline;
}

.board {
  display: grid;
  grid-template-columns: var(--grid-template, repeat(4, minmax(56px, 56px)));
  grid-auto-rows: var(--card-size, 56px);
  gap: var(--gap);
  justify-content: center;
  align-content: center;
  width: max-content;
  max-width: 100%;
  max-height: 100%;
}

.card {
  position: relative;
  border: 1px solid #ddd3bf;
  border-radius: var(--radius);
  width: var(--card-size, 56px);
  height: var(--card-size, 56px);
  font:
    700 clamp(1.5rem, 3.1vw, 2.2rem) "Trebuchet MS",
    "Avenir Next",
    sans-serif;
  color: var(--card-color, #36516a);
  background: #ffffff;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9),
    0 1px 3px rgba(43, 30, 9, 0.12);
  cursor: pointer;
  display: grid;
  place-items: center;
  z-index: 0;
  transition:
    transform 120ms ease,
    box-shadow 120ms ease;
}

.proposed-icon {
  position: absolute;
  right: 4px;
  bottom: 4px;
  min-width: 1.35em;
  height: 1.35em;
  padding: 0 0.24em;
  border-radius: 999px;
  border: 1px solid var(--proposed-color, #5b7693);
  background: color-mix(in srgb, var(--proposed-color, #5b7693) 14%, #ffffff 86%);
  color: var(--proposed-color, #35577c);
  font-size: clamp(0.62rem, 1.35vw, 0.9rem);
  line-height: 1.1em;
  font-weight: 700;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.card::before {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: calc(var(--radius) - 0.22rem);
  border: 3px solid var(--card-color, #36516a);
  pointer-events: none;
  z-index: -1;
}

.card:hover {
  transform: translateY(-1px) scale(1.01);
  box-shadow: 0 4px 12px rgba(43, 30, 9, 0.18);
}

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

.card.selected {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 5px 12px rgba(43, 30, 9, 0.22);
}

.card.selected::before {
  filter: brightness(0.84);
}

.card.wild {
  --card-color: #7d4ce0;
  color: #5d33b5;
}

.card.free {
  --card-color: #ffcb20;
  color: #7a5e00;
}

.card.wild::before,
.card.free::before {
  border: none;
  background: color-mix(in srgb, var(--card-color) 68%, #ffffff 32%);
}

.card.free::before {
  background: color-mix(in srgb, var(--card-color) 48%, #ffffff 52%);
}

.card.facedown {
  --card-color: #8ba0b8;
  color: #8ba0b8;
}

.card.facedown::before {
  border-color: #8ba0b8;
}

.card.pair-clue {
  --card-color: #2f7b73;
  color: #2f7b73;
}

.card.valid-target {
  box-shadow:
    0 0 0 2px #2f7b73,
    0 1px 3px rgba(43, 30, 9, 0.12);
}

.card.blocked {
  opacity: 0.35;
  cursor: not-allowed;
}

@media (max-width: 640px) {
  .app {
    padding: 1rem;
  }

  .controls {
    gap: 0.6rem;
  }

  .control {
    min-width: 120px;
  }

  .control-inline {
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .difficulty-btn {
    font-size: 0.8rem;
    padding: 0.45rem 0.2rem;
    gap: 0.2rem;
  }

  .difficulty-buttons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hotkey-chip {
    font-size: 0.68em;
    padding: 0.1em 0.34em;
  }

  .clue-panel {
    gap: 0.3rem;
  }

  .clue-inline {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 0.42rem 0.5rem 0.42rem 0.6rem;
  }

  .clue-actions {
    justify-content: flex-start;
  }
}