@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --paper: #EDF0F3;
  --paper-2: #E2E6EB;
  --ink: #1B2530;
  --ink-2: #5A6673;
  --bone: #FBF8F0;
  --amber: #D9A126;
  --ok: #CFE6CB;
  --ok-ink: #2E6B34;
  --bad: #F2CFCC;
  --bad-ink: #9B2F2A;
  --radius: 10px;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 16px;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
a { color: inherit; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

.wrap { max-width: 720px; margin: 0 auto; padding: 16px; }

.top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 600; text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--ink-2); font-weight: 400; }
.nav a { margin-left: 14px; color: var(--ink-2); text-decoration: none; }
.nav a[aria-current] { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }

h1 { font-size: 1.35rem; font-weight: 600; margin: 24px 0 4px; letter-spacing: -0.01em; }
.sub { color: var(--ink-2); margin: 0 0 16px; }

/* ---- play page ---- */
.playbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 20px 0 12px; flex-wrap: wrap; }
.levels { display: inline-flex; background: var(--paper-2); border-radius: 999px; padding: 3px; }
.levels a { text-decoration: none; padding: 6px 14px; border-radius: 999px; color: var(--ink-2); }
.levels a[aria-current] { background: var(--ink); color: var(--bone); }
.levels a.done::after { content: ' ✓'; }
.timer { font-variant-numeric: tabular-nums; font-size: 1.4rem; font-weight: 500; min-width: 4.5ch; text-align: right; }
.timer.paused { color: var(--ink-2); }

.board-wrap { background: var(--bone); border-radius: 16px; padding: 10px; box-shadow: inset 0 0 0 1px var(--paper-2); }
.board { display: block; width: 100%; height: auto; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.board .cell { fill: var(--paper); stroke: none; }
.board .cell.ok { fill: var(--ok); }
.board .cell.bad { fill: var(--bad); }
.board .cell.anchor { fill: var(--amber); fill-opacity: .55; }
.board .inner { stroke: var(--paper-2); stroke-width: .03; }
.board .edge { stroke: var(--ink); stroke-width: .07; stroke-linecap: round; }
.board .tile { fill: var(--bone); stroke: var(--ink); stroke-width: .05; }
.board .tile.selected { stroke: var(--amber); stroke-width: .11; }
.board .mid { stroke: var(--ink); stroke-width: .03; }
.board .pip { fill: var(--ink); }
.board .pip.ghost { fill-opacity: .35; }
.board .label { font-size: .34px; font-weight: 600; text-anchor: middle; dominant-baseline: central; fill: var(--ink); }
.board .label-bg { fill: var(--bone); stroke: var(--ink); stroke-width: .045; }
.board .hit { fill: transparent; cursor: pointer; }

.actions { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; min-height: 38px; }
.btn { background: var(--paper-2); border: 0; border-radius: 999px; padding: 8px 16px; }
.btn.primary { background: var(--ink); color: var(--bone); }
.btn.quiet { background: transparent; color: var(--ink-2); }
.hint { color: var(--ink-2); margin: 6px 0 0; font-size: .95rem; }

.tray { display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: 10px; margin-top: 8px; }
.tray button { background: transparent; border: 0; padding: 0; border-radius: 8px; }
.tray svg { width: 100%; height: auto; display: block; }
.tray .tile { fill: var(--bone); stroke: var(--ink); stroke-width: .05; }
.tray .selected .tile { stroke: var(--amber); stroke-width: .12; }
.tray .placed { opacity: .28; }
.tray .pip { fill: var(--ink); }
.tray .mid { stroke: var(--ink); stroke-width: .03; }

.solved { background: var(--ok); color: var(--ok-ink); border-radius: var(--radius); padding: 14px 16px; margin: 12px 0; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.solved[hidden] { display: none; }
.solved strong { font-size: 1.25rem; font-variant-numeric: tabular-nums; }

/* ---- archive page ---- */
.toolbar { display: flex; gap: 8px; margin: 8px 0 20px; flex-wrap: wrap; }
.month { margin: 22px 0 8px; font-weight: 600; color: var(--ink-2); }
.days { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.day { background: var(--bone); border-radius: var(--radius); padding: 10px 12px; box-shadow: inset 0 0 0 1px var(--paper-2); }
.day .d { font-weight: 600; }
.day .chips { display: flex; gap: 6px; margin-top: 6px; }
.day .chips a { flex: 1; text-decoration: none; text-align: center; font-size: .8rem; padding: 4px 0; border-radius: 6px; background: var(--paper); color: var(--ink-2); font-variant-numeric: tabular-nums; }
.day .chips a.done { background: var(--ok); color: var(--ok-ink); }
.day .chips a.partial { background: var(--paper-2); color: var(--ink); }

/* ---- stats page ---- */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0; }
.stat { background: var(--bone); border-radius: var(--radius); padding: 12px 14px; box-shadow: inset 0 0 0 1px var(--paper-2); }
.stat .k { color: var(--ink-2); font-size: .85rem; }
.stat .v { font-size: 1.3rem; font-weight: 600; font-variant-numeric: tabular-nums; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--paper-2); }
th { color: var(--ink-2); font-weight: 500; }
td.n, th.n { text-align: right; }
@media (max-width: 480px) { .grid3 { grid-template-columns: 1fr; } }