* { box-sizing: border-box; }
body { font-family: system-ui, sans-serif; margin: 0; color: #1a1a2e; background: #f4f4f8; }
header { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: #16213e; color: #fff; }
h1 { font-size: 1.1rem; margin: 0; }
.chip { background: #0f3460; color: #fff; border-radius: 999px; padding: 6px 12px; font-size: .85rem; cursor: pointer; }
main { padding: 16px; max-width: 720px; margin: 0 auto; display: grid; gap: 20px; }
section { background: #fff; border-radius: 12px; padding: 16px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.cell { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid #ccc; border-radius: 8px; font-size: 1rem; cursor: pointer; }
.cell.available { background: #d4f5dd; }
.cell.maybe { background: #fff3c4; }
.cell.no { background: #f7d6d6; }
.cell[aria-readonly="true"] { opacity: .65; cursor: default; }
.toast { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); background: #16213e; color: #fff; padding: 10px 16px; border-radius: 8px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }
button { min-height: 40px; border-radius: 8px; border: 1px solid #16213e; background: #16213e; color: #fff; padding: 8px 14px; cursor: pointer; }
button.secondary { background: #fff; color: #16213e; }
.legend { font-size: .8rem; color: #555; margin-top: 8px; }