:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --ink: #1d232b;
  --muted: #5d6672;
  --line: #e4dfd5;
  --soft: #efebe3;
  --brand: #0f6f68;
  --brand-soft: #e3f1ee;
  --zip: #e2602a;
  --zip-soft: #fdeee6;
  --wend: #6a4fc8;
  --wend-soft: #efebfb;
  --block: #b9b3a8;
  --w0: #ffd9c7; --w1: #cde8ff; --w2: #d7f2d0; --w3: #f3d7f6; --w4: #fff0b8; --w5: #d4f1ef;
  --r0: #f08a5d; --r1: #5aa7e8; --r2: #6cc25c; --r3: #c26bd0; --r4: #e2b62c; --r5: #3fb7ad;
  --accent: var(--brand);
  --accent-soft: var(--brand-soft);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181c; --card: #1e2227; --ink: #e8e6e1; --muted: #a3a9b1; --line: #343a42; --soft: #262b31;
    --brand: #4fc2b6; --brand-soft: #1d3532; --zip: #f08a5d; --zip-soft: #3a2a22; --wend: #a893f0;
    --wend-soft: #2c2741; --block: #4b5058;
    --w0: #5a3a2c; --w1: #253f58; --w2: #2d4a2a; --w3: #4a2d4f; --w4: #4d4220; --w5: #224644;
  }
}
:root[data-theme="dark"] {
  --bg: #15181c; --card: #1e2227; --ink: #e8e6e1; --muted: #a3a9b1; --line: #343a42; --soft: #262b31;
  --brand: #4fc2b6; --brand-soft: #1d3532; --zip: #f08a5d; --zip-soft: #3a2a22; --wend: #a893f0;
  --wend-soft: #2c2741; --block: #4b5058;
  --w0: #5a3a2c; --w1: #253f58; --w2: #2d4a2a; --w3: #4a2d4f; --w4: #4d4220; --w5: #224644;
}
.g-zip { --accent: var(--zip); --accent-soft: var(--zip-soft); }
.g-wend { --accent: var(--wend); --accent-soft: var(--wend-soft); }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-underline-offset: 2px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
h1 { font-size: 1.85rem; line-height: 1.25; margin: .6rem 0 .4rem; letter-spacing: -.01em; }
h2 { font-size: 1.3rem; line-height: 1.3; margin: 2rem 0 .6rem; }
h3 { font-size: 1.05rem; margin: 1.3rem 0 .3rem; }
p, ul, ol { margin: .5rem 0 .9rem; }
li { margin: .25rem 0; }

.top { background: var(--card); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; font-weight: 700; }
.menu { display: flex; gap: 4px; }
.menu a { color: var(--ink); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: .95rem; }
.menu a:hover { background: var(--soft); }

.crumbs { font-size: .85rem; color: var(--muted); margin-top: 14px; }
.crumbs a { color: var(--muted); }
.crumbs span { margin: 0 2px; }
.meta { color: var(--muted); font-size: .92rem; margin-top: 0; }
.lede { font-size: 1.08rem; }
.note { background: var(--soft); border-radius: 10px; padding: 10px 14px; }
.small { font-size: .85rem; color: var(--muted); }

.jump { display: flex; flex-wrap: wrap; gap: 8px; }
.jump a {
  padding: 6px 12px; border-radius: 999px; background: var(--accent-soft);
  text-decoration: none; font-size: .92rem; font-weight: 600;
}

.btn {
  display: inline-block; padding: 9px 16px; border-radius: 10px; background: var(--accent);
  color: #fff; text-decoration: none; font-weight: 600; border: 0; font-size: 1rem; cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn.ghost { background: var(--accent-soft); color: var(--accent); }

.boardwrap { margin: 12px auto; text-align: center; }
.boardwrap figcaption { font-size: .88rem; color: var(--muted); margin-top: 6px; }
figure { margin: 16px 0; }
.board { max-width: 100%; height: auto; width: min(100%, 420px); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pair .board { width: 100%; }

/* Zip board */
.board .bg { fill: var(--card); }
.board .gl { stroke: var(--line); stroke-width: 1.5; }
.board .frame { fill: none; stroke: var(--ink); stroke-width: 3; }
.board .wall { stroke: var(--ink); stroke-width: 7; stroke-linecap: round; }
.board .num { fill: var(--ink); }
.board .numt { fill: var(--card); font: 700 20px system-ui, sans-serif; text-anchor: middle; dominant-baseline: central; }
.board .path { fill: none; stroke: var(--zip); stroke-width: 24; stroke-linecap: round; stroke-linejoin: round; opacity: .8; }
.board .link { fill: none; stroke: var(--zip); stroke-width: 12; stroke-linecap: round; opacity: .75; }

/* Wend board */
.wendb .tile { fill: var(--soft); stroke: var(--line); stroke-width: 1.5; }
.wendb .block { fill: var(--block); }
.wendb .letter { fill: var(--ink); font: 700 26px system-ui, sans-serif; text-anchor: middle; dominant-baseline: central; }
.wendb .route { fill: none; stroke-width: 10; stroke-linecap: round; stroke-linejoin: round; opacity: .55; }
.wendb .start { fill: none; stroke: var(--wend); stroke-width: 4; }
.wendb .w0 { fill: var(--w0); } .wendb .w1 { fill: var(--w1); } .wendb .w2 { fill: var(--w2); }
.wendb .w3 { fill: var(--w3); } .wendb .w4 { fill: var(--w4); } .wendb .w5 { fill: var(--w5); }
.wendb .r0 { stroke: var(--r0); } .wendb .r1 { stroke: var(--r1); } .wendb .r2 { stroke: var(--r2); }
.wendb .r3 { stroke: var(--r3); } .wendb .r4 { stroke: var(--r4); } .wendb .r5 { stroke: var(--r5); }

/* Hints and answer */
details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin: 10px 0; }
details > summary {
  cursor: pointer; padding: 13px 16px; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px;
}
details > summary::-webkit-details-marker { display: none; }
details > summary::after { content: "Show"; margin-left: auto; font-size: .85rem; color: var(--accent); font-weight: 600; }
details[open] > summary::after { content: "Hide"; }
details > :not(summary) { margin-left: 16px; margin-right: 16px; }
details[open] { padding-bottom: 6px; }
.tag {
  font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
  background: var(--accent-soft); color: var(--accent); padding: 2px 8px; border-radius: 6px;
}
details.answer { border-color: var(--accent); }
details.answer > summary { color: var(--accent); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.15rem; letter-spacing: .08em; word-spacing: .4em; }
.legs { columns: 2; column-gap: 24px; }
.words { font-size: 1.05rem; }
.hintlist { padding-left: 20px; }
.hintlist li { margin: .35rem 0; }

.stale { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; font-weight: 600; }
.next { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.cta {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--accent-soft); border-radius: 12px; padding: 14px 16px; margin: 24px 0;
}
.cta p { margin: 0; }

.list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.list li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 2px; border-bottom: 1px solid var(--line); margin: 0; }
.list span { color: var(--muted); font-size: .92rem; }
.prevnext { display: flex; justify-content: space-between; gap: 12px; margin: 22px 0; font-weight: 600; }

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 18px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.card h2 { margin: 0; font-size: 1.25rem; }
.card h2 a { color: var(--ink); text-decoration: none; }
.card .meta { margin: 2px 0 8px; }
.card .thumb { display: block; text-align: center; }
.card .thumb .board { width: 100%; max-width: 300px; }
.card .actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 10px 0 0; font-size: .95rem; }
.c-zip { --accent: var(--zip); --accent-soft: var(--zip-soft); }
.c-wend { --accent: var(--wend); --accent-soft: var(--wend-soft); }

.faq h3 { margin-top: 1rem; }
.foot { margin-top: 48px; border-top: 1px solid var(--line); background: var(--card); padding: 18px 0 26px; }
.foot .links { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0 0 8px; }
.foot .links a { color: var(--muted); font-size: .92rem; }

/* Games */
.game { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin: 16px 0; }
.gbar { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); background: var(--bg); color: var(--ink); border-radius: 999px; padding: 6px 12px; font-size: .9rem; cursor: pointer; }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.ginfo { display: flex; justify-content: space-between; margin: 10px 2px 4px; color: var(--muted); font-size: .92rem; }
.gtime { font-variant-numeric: tabular-nums; font-weight: 600; }
.gboard { text-align: center; outline: none; }
.gboard:focus-visible .board { outline: 3px solid var(--accent-soft); border-radius: 10px; }
.board.play { width: min(100%, 460px); touch-action: none; user-select: none; -webkit-user-select: none; cursor: pointer; }
.gmsg { min-height: 1.6em; text-align: center; margin: 6px 0; }
.gctl { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.gctl .btn { padding: 8px 14px; font-size: .95rem; }
.game.won .board { animation: pop .6s ease; }
@keyframes pop { 40% { transform: scale(1.03); } }
.wendb .tile.picked { fill: var(--wend-soft); stroke: var(--wend); stroke-width: 3; }
.wendb .route.sel { stroke: var(--wend); opacity: .6; }
.slots { display: flex; flex-direction: column; align-items: center; gap: 6px; margin: 8px 0; }
.slot { display: flex; gap: 4px; padding: 2px 4px; border-radius: 6px; }
.slot span { width: 26px; height: 30px; border-bottom: 2px solid var(--line); display: flex; align-items: center; justify-content: center; font-weight: 700; }
.slot.got span { border-bottom-color: transparent; }
.slot.w0 { background: var(--w0); } .slot.w1 { background: var(--w1); } .slot.w2 { background: var(--w2); }
.slot.w3 { background: var(--w3); } .slot.w4 { background: var(--w4); } .slot.w5 { background: var(--w5); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.5rem; }
  .cards { grid-template-columns: 1fr; }
  .legs { columns: 1; }
  .menu a { padding: 6px 8px; }
  .brand { font-size: .95rem; white-space: nowrap; }
  .brand img { width: 22px; height: 22px; }
}