/* 記憶力チャレンジ – styles */
:root {
  --bg: #f7f7fb;
  --panel: #ffffff;
  --text: #222;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-weak: #e5e7ff;
  --ok: #10b981;
  --bad: #ef4444;
  --card: #f1f5f9;
  --shadow: 0 10px 25px rgba(0,0,0,.08);
  --radius: 1.2rem;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans JP, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  background: radial-gradient(1200px 1200px at 10% -10%, #eef2ff 0, transparent 50%), var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

.app-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: .5rem;
  padding: .75rem clamp(12px, 3vw, 24px);
  backdrop-filter: saturate(1.2) blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.back-btn {
  justify-self: start;
  text-decoration: none;
  background: var(--panel);
  padding: .6rem .9rem;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  box-shadow: var(--shadow);
  color: var(--text);
  font-weight: 600;
}

.app-title {
  justify-self: center;
  margin: 0;
  font-size: clamp(18px, 2.2vw, 28px);
  letter-spacing: .02em;
}

.header-actions {
  justify-self: end;
  display: flex;
  gap: .5rem;
}

.app-main {
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(12px, 3vw, 24px);
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .75rem;
  background: var(--panel);
  border-radius: var(--radius);
  padding: .75rem;
  box-shadow: var(--shadow);
  align-items: center;
}

.hud-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-size: clamp(12px, 1.8vw, 15px);
  color: var(--muted);
}
.hud-item strong { color: var(--text); font-size: 1.1em; }

.board-wrap {
  margin-top: 1rem;
  background: var(--panel);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

#message {
  min-height: 1.5rem;
  text-align: center;
  margin-bottom: .5rem;
  font-weight: 600;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: .6rem;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  position: relative;
  aspect-ratio: 1/1;
  background: var(--card);
  border-radius: 20px;
  border: 1px solid #e5e7eb;
  cursor: pointer;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0,0,0,.04) inset;
  transition: transform .08s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  touch-action: manipulation;
}
.card:active { transform: scale(.98); }

.card .content {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-size: clamp(18px, 5vw, 42px);
  font-weight: 800;
  color: var(--text);
  opacity: 0;
  transform: scale(.9);
  transition: opacity .15s ease, transform .15s ease;
}
.card.show .content {
  opacity: 1; transform: scale(1);
}

.card::after {
  content: "";
  position: absolute; inset: 0;
  background: transparent;
  transition: background .15s ease;
}
.card.flash::after { background: rgba(79,70,229,.18); }
.card.correct { border-color: rgba(16,185,129,.6); background: #ecfdf5; }
.card.wrong { border-color: rgba(239,68,68,.6); background: #fef2f2; }

.controls {
  margin: 1rem auto 0;
  display: flex; gap: .6rem; justify-content: center;
}

.primary, .secondary {
  border: none;
  border-radius: 999px;
  padding: .75rem 1.1rem;
  font-weight: 700; letter-spacing: .02em;
  cursor: pointer;
  transition: transform .08s ease, box-shadow .15s ease, background .2s ease;
  box-shadow: var(--shadow);
}
.primary {
  background: var(--primary);
  color: white;
}
.primary:hover { filter: brightness(1.03); }
.secondary {
  background: var(--panel);
  border: 1px solid #e5e7eb;
  color: var(--text);
}
.hidden { display: none !important; }

/* Icon button (e.g., '?' help) */
.icon-btn {
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  padding: 0;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  font-size: 20px;
  line-height: 1;
}

/* toggle switch */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { display:none; }
.slider {
  position: absolute; cursor: pointer; inset: 0; background: #e5e7eb; transition: .2s; border-radius: 999px;
}
.slider:before {
  content: ""; position: absolute; height: 18px; width: 18px; left: 3px; top: 3px; background: white; transition: .2s; border-radius: 50%; box-shadow: 0 2px 5px rgba(0,0,0,.2);
}
input:checked + .slider { background: var(--primary-weak); }
input:checked + .slider:before { transform: translateX(20px); }
.switch-label { margin-left: .4rem; }

.app-footer {
  text-align: center; color: var(--muted);
  padding: 1.2rem;
}

dialog {
  border: none;
  border-radius: 16px;
  max-width: min(680px, 92vw);
  width: 100%;
  box-shadow: var(--shadow);
  padding: 0;
}
dialog::backdrop { background: rgba(0,0,0,.25); backdrop-filter: blur(2px); }
.modal-content { padding: 1.2rem; }
.modal-content h2 { margin-top: 0; }
.modal-actions { margin-top: 1rem; display: flex; justify-content: flex-end; }

\1

  /* Mobile layout: Title on first row, buttons on second row (parallel) */
  .app-title { grid-column: 1 / -1; grid-row: 1; }
  .back-btn { grid-column: 1; grid-row: 2; }
  .header-actions { grid-column: 2; grid-row: 2; justify-self: end; }

  .hud { grid-template-columns: repeat(2, 1fr); }
  .app-header { grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: .4rem; }
  .app-title { grid-column: 1 / -1; }
  /* Mobile header sizing */
  .back-btn { padding: .5rem .8rem; font-size: .95rem; }
  .header-actions .secondary { padding: .5rem .8rem; font-size: .95rem; }
  .icon-btn { width: 44px; height: 44px; min-width: 44px; min-height: 44px; font-size: 20px; }
}


@media (min-width: 641px) {
  /* Make whole board (HUD + grid + controls) fit without vertical scroll on typical desktops */
  .board-wrap { padding: .9rem; }
  .grid { 
    gap: .5rem;
    /* Board width is limited by vmin and by viewport height minus room for header/HUD/controls */
    max-width: min(620px, 80vmin, calc(100vh - 320px));
  }
  .controls { margin-top: .8rem; }
}


/* ===== Desktop-only layout (>=1024px) ===== */
@media (min-width: 1024px) {
  /* Two-column layout: left = HUD sidebar, right = board */
  .app-main {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1rem;
    align-items: start;
    max-width: 1200px;
  }

  /* Sidebar HUD */
  .hud {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 12px; /* below sticky header */
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    background: var(--panel);
    /* Stack items vertically in the sidebar */
    grid-template-columns: 1fr;
    gap: .6rem;
  }
  .hud-item {
    justify-content: space-between;
    font-size: 14px;
  }

  /* Game board area */
  .board-wrap {
    grid-column: 2;
    grid-row: 1;
    margin-top: 0;
  }

  /* ~15% smaller board on desktop and responsive to viewport height */
  .grid {
    gap: .5rem;
    max-width: min(530px, 72vmin, calc(100vh - 340px));
  }

  .controls { margin-top: .8rem; }
}