:root {
  --bg: #efe6d9;
  --ink: #2c241d;
  --muted: #6d6258;
  --accent: #9c3b2e;
  --paper: #fffaf3;
  --line: #d9cbb8;
  --gold: #c9842a;
  --gold-soft: #f4e2c4;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 50% -8%, #fffaf3, transparent 70%),
    var(--bg);
  font-family: "Yu Gothic UI", "Yu Gothic", "Hiragino Sans", Meiryo, sans-serif;
}

button,
select {
  font: inherit;
  color: inherit;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 16px 36px;
}

header {
  text-align: center;
}

h1 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.lede {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
  text-wrap: balance;
}

.switch {
  margin: 8px 0 0;
}

.switch a {
  color: var(--muted);
  font-size: 0.92rem;
}

.timer {
  margin: 0 0 8px;
  font-size: 2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.timer.is-stopped {
  color: var(--accent);
}

.mobile-controls {
  display: none;
}

.toolbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.photo-field {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.photo-field[hidden] {
  display: none;
}

select,
.restart {
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0 14px;
}

.restart {
  background: var(--accent);
  color: #fffaf3;
  border: none;
  cursor: pointer;
}

.restart:disabled {
  opacity: 0.45;
  cursor: default;
}

.restart:hover:not(:disabled) {
  filter: brightness(1.08);
}

.message {
  margin: 14px 0 0;
  color: var(--accent);
}

.stage {
  width: min(1080px, 100%);
  margin-top: 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  column-gap: 10px;
  align-items: start;
}

.col-head {
  height: 28px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.col-head.spacer {
  visibility: hidden;
}

.side {
  display: flex;
  flex-direction: column;
}

.pair {
  flex: 1 1 0;
  display: flex;
  gap: 4px;
  min-height: 0;
  padding: 1px 0;
}

.pair button {
  flex: 1;
  min-width: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  cursor: pointer;
  font-size: 1.05rem;
  line-height: 1;
  user-select: none;
  touch-action: manipulation;
}

.pair.is-selected button {
  background: var(--gold-soft);
  border-color: var(--gold);
}

.pair button:hover:not(:disabled) {
  border-color: var(--gold);
}

.pair button:focus-visible,
.mobile-controls button:focus-visible,
.restart:focus-visible,
select:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.pair button:disabled {
  opacity: 0.32;
  cursor: default;
}

.board {
  position: relative;
  width: fit-content;
  margin: 0 auto;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 14px 36px rgba(55, 32, 16, 0.16);
  background: #2a211c;
}

canvas {
  display: block;
  max-width: 100%;
}

.clear {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 30%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6%;
  background: linear-gradient(to top, rgba(24, 14, 10, 0.78), rgba(24, 14, 10, 0));
  color: #fffaf3;
  font-size: clamp(2rem, 5vw, 3.1rem);
  font-weight: 700;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  pointer-events: none;
  animation: rise 0.45s ease;
}

.clear[hidden] {
  display: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 18px 10px 24px;
  }

  h1 {
    font-size: 1.35rem;
  }

  .pair button {
    min-width: 36px;
    font-size: 0.95rem;
  }

  .stage {
    column-gap: 6px;
  }
}

@media (max-width: 560px) {
  .col {
    display: none;
  }

  .board-col .col-head {
    display: none;
  }

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

  .mobile-controls {
    display: flex;
    gap: 8px;
    width: min(520px, 100%);
    margin-top: 12px;
  }

  .mobile-controls button {
    flex: 1;
    min-height: 52px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--paper);
    font-size: 1.35rem;
    cursor: pointer;
    touch-action: manipulation;
  }

  .mobile-controls button:disabled {
    opacity: 0.32;
    cursor: default;
  }
}

@media (prefers-reduced-motion: reduce) {
  .clear {
    animation: none;
  }
}