/* HintPuzzle — direction A "Tile flip" prototype, round 2 */
:root{
  --table:#F2EFE8; --face:#FBF9F4; --ink:#1F1B2D; --ink-2:#5D5870; --ink-3:#69647C; --line:#DDD6C8; --edge:#CFC6B4;
  --wordle:#5E8C4A; --connections:#7B5EA7; --strands:#2B8A8A; --bee:#D99A1C; --pips:#E2664F; --boxed:#C24E6E; --krillion:#2F6FB0;
  /* Connections difficulty colors — our own values, deliberately off the game's palette */
  --c-yellow:#F4C542; --c-green:#7CBF8E; --c-blue:#7FAFE6; --c-purple:#A68BE0;
  --g:var(--ink); --r:12px;
  --font-d:"Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --font-b:"Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --flip: 440ms cubic-bezier(.3,1.35,.5,1);
}
[data-game=wordle]{--g:var(--wordle)} [data-game=connections]{--g:var(--connections)} [data-game=strands]{--g:var(--strands)}
[data-game=bee]{--g:var(--bee)} .brick[data-game=bee] .no,.brick[data-game=pips] .no{color:color-mix(in oklab,var(--g) 62%,#000)} [data-game=pips]{--g:var(--pips)} [data-game=boxed]{--g:var(--boxed)} [data-game=krillion]{--g:var(--krillion)}
[data-game],[data-grp]{--g-deep:color-mix(in oklab,var(--g) 74%,#000);--g-tint:color-mix(in oklab,var(--g) 13%,var(--face));--g-line:color-mix(in oklab,var(--g) 48%,var(--face))}
[data-grp=yellow]{--lite:var(--c-yellow)} [data-grp=green]{--lite:var(--c-green)} [data-grp=blue]{--lite:var(--c-blue)} [data-grp=purple]{--lite:var(--c-purple)}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--table);color:var(--ink);font:400 16px/1.6 var(--font-b);-webkit-font-smoothing:antialiased}
a{color:inherit}
.num{font-variant-numeric:tabular-nums}
.wrap{max-width:680px;margin:0 auto;padding:0 16px}
.wrap-wide{max-width:1040px;margin:0 auto;padding:0 16px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}

/* ---------- top bar ---------- */
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;height:58px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;font:800 20px/1 var(--font-d);letter-spacing:-.01em}
.logo-mark{display:grid;grid-template-columns:repeat(2,11px);gap:3px}
.logo-mark i{width:11px;height:11px;border-radius:3px;box-shadow:0 2px 0 rgba(31,27,45,.25)}
.bar-date{font:700 14px/1 var(--font-b);display:flex;align-items:center;gap:8px}
.dot-live{width:8px;height:8px;border-radius:50%;background:var(--wordle);box-shadow:0 0 0 3px rgba(94,140,74,.18)}

/* ---------- pixel icons ---------- */
.px{width:30px;height:30px;flex:none}
.px svg{display:block;width:100%;height:100%}
.px-sm{width:20px;height:20px}
.socket{flex:none;display:grid;place-items:center;width:46px;height:46px;border-radius:10px;background:var(--face);border:2px solid var(--g-line);box-shadow:0 2px 0 var(--g-line)}

/* ---------- home: a table of bricks ---------- */
.home-head{padding:4px 0 18px}
.home-head h1{font:800 30px/1.15 var(--font-d);letter-spacing:-.02em;margin:0 0 6px}
.home-head p{margin:0;color:var(--ink-2);font-size:15px;line-height:1.5}
.deck{display:grid;grid-template-columns:1fr 1fr;gap:16px 12px;padding-bottom:8px}
.brick{
  position:relative;display:flex;flex-direction:column;gap:10px;padding:14px;min-height:148px;text-decoration:none;color:inherit;
  background-color:var(--g-deep);color:#fff;border:2px solid color-mix(in oklab,var(--g) 60%,#000);border-radius:var(--r);
  box-shadow:0 5px 0 color-mix(in oklab,var(--g) 48%,#000), inset 0 1px 0 rgba(255,255,255,.22);
  background-image:radial-gradient(rgba(255,255,255,.13) 1px, transparent 1.2px);background-size:9px 9px;
  transition:transform 120ms ease, box-shadow 120ms ease
}
.brick:active{transform:translateY(4px);box-shadow:0 1px 0 color-mix(in oklab,var(--g) 48%,#000)}
@media (hover:hover){.brick:hover{transform:translateY(-2px);box-shadow:0 7px 0 color-mix(in oklab,var(--g) 48%,#000)}}
.brick .socket{border-color:rgba(255,255,255,.6);box-shadow:none}
.brick .top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.brick .no{display:none}
.brick h2{font:800 19px/1.15 var(--font-d);margin:0;letter-spacing:-.01em}
.brick .meta{font-size:14px;line-height:1.4;color:rgba(255,255,255,.9);margin:0}
.brick .steps{margin-top:auto;display:flex;gap:4px}
.brick .steps i{width:14px;height:14px;border-radius:4px;background:rgba(255,255,255,.92)}
.brick .steps i.ans{background:transparent;border:2px solid rgba(255,255,255,.92)}
.brick.wide{grid-column:1/-1;flex-direction:row;align-items:flex-start;gap:14px;min-height:0}
.brick.wide .body{display:flex;flex-direction:column;gap:6px;flex:1;min-width:0;align-self:stretch}
.brick.wide .steps{margin-top:auto;padding-top:4px}
.deal{animation:drop 480ms cubic-bezier(.25,.9,.35,1) both}
@keyframes drop{0%{opacity:0;transform:translate(var(--dx,0),-26px) rotate(var(--rot,-2deg)) scale(1.03)}60%{opacity:1;transform:translateY(2px) rotate(0) scale(1)}80%{transform:translateY(-1px)}100%{transform:none}}
.section{padding:30px 0 4px}
.section h2{font:800 18px/1.2 var(--font-d);margin:0 0 12px}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 8px;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 36px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 36px),transparent)}
.chips::-webkit-scrollbar{display:none}
.chips a{flex:none;padding:8px 12px;font:600 14px/1.25 var(--font-b);white-space:nowrap;text-decoration:none;background:var(--face);border:2px solid var(--line);border-radius:10px;box-shadow:0 3px 0 var(--edge)}
.chips a small{display:block;font-weight:500;color:var(--ink-3);font-size:12.5px}
.foot{margin-top:36px;padding:22px 0 40px;border-top:1px solid var(--line);font-size:13px;line-height:1.55;color:var(--ink-3);max-width:640px}
.foot nav{display:flex;gap:14px;margin-bottom:8px}
.foot nav a{color:var(--ink-2);font-weight:500}

/* ---------- puzzle page ---------- */
.games-rail{display:flex;gap:4px;overflow-x:auto;padding:2px 16px 10px;margin:0 -16px;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 64px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 64px),transparent)}
.games-rail::-webkit-scrollbar{display:none}
.games-rail a{flex:none;display:flex;align-items:center;gap:6px;padding:6px 10px 6px 7px;border-radius:10px;border:2px solid transparent;font:600 13px/1 var(--font-b);color:var(--ink-2);text-decoration:none}
.games-rail a[aria-current]{background:var(--face);border-color:var(--line);color:var(--ink);box-shadow:0 3px 0 var(--edge)}
.band{display:flex;align-items:center;gap:12px;padding:4px 0 2px}
.band .socket{width:44px;height:44px}
.band .px{width:28px;height:28px}
.band h1{font:800 21px/1.15 var(--font-d);letter-spacing:-.01em;margin:0}
.band .sub{display:flex;flex-wrap:wrap;align-items:center;gap:4px 8px;margin-top:5px;font-size:13.5px;line-height:1.3;color:var(--ink-2)}
.band .sub a{color:var(--ink);font-weight:600;text-decoration:none;padding:3px 8px;border-radius:7px;background:var(--face);border:1.5px solid var(--line);box-shadow:0 2px 0 var(--edge)}
.band .sub a:active{transform:translateY(1px);box-shadow:none}

/* stack of tiles */
.stack{display:flex;flex-direction:column;gap:12px;margin-top:16px}
.flip{position:relative;display:block;cursor:pointer;perspective:1100px;-webkit-tap-highlight-color:transparent;border-radius:var(--r)}
.flip-in{display:block;position:relative;transform-style:preserve-3d;transition:transform var(--flip);border-radius:var(--r)}
.flip-in > *{backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--r)}
.flip-in > .front{position:absolute;inset:0;overflow:hidden}
.flip.is-open .flip-in > .front{position:relative;inset:auto;overflow:visible}
.flip.is-open .flip-in > .back{position:absolute;inset:0}
.flip.is-open .flip-in{transform:rotateX(-180deg)}
.flip:not(.is-open):active .flip-in{transform:translateY(3px)}
.flip.is-open{cursor:default}
.tile-n{flex:none;width:36px;height:36px;border-radius:9px;display:grid;place-items:center;font:800 19px/1 var(--font-d)}
.back{
  display:flex;align-items:center;gap:14px;padding:12px 14px;min-height:64px;background-color:var(--g-deep);color:#fff;
  border:2px solid color-mix(in oklab,var(--g) 60%,#000);box-shadow:0 4px 0 color-mix(in oklab,var(--g) 50%,#000), inset 0 1px 0 rgba(255,255,255,.22);
  background-image:radial-gradient(rgba(255,255,255,.13) 1px, transparent 1.2px);background-size:9px 9px
}
.back .tile-n{background:rgba(255,255,255,.95);color:var(--g-deep)}
.back .t{flex:1;min-width:0}
.back .t b{display:block;font:700 16px/1.25 var(--font-b)}
.back .t small{display:block;font-size:13px;line-height:1.35;color:rgba(255,255,255,.88);margin-top:1px}
.back .go{flex:none;font:600 13px/1 var(--font-b);color:rgba(255,255,255,.92)}
/* the opened face keeps the brick: tinted face, game-colored rim, thick edge */
.front{
  transform:rotateX(180deg);display:flex;gap:14px;padding:12px 14px 14px;
  background:var(--g-tint);border:2px solid var(--g-line);box-shadow:0 4px 0 var(--g-deep)
}
.front .tile-n{background:var(--face);color:var(--g-deep);border:2px solid var(--g-line)}
.front .t{flex:1;min-width:0}
.front .lbl{display:block;font:700 13px/1.3 var(--font-b);color:var(--g-deep);margin:1px 0 2px}
.front .say{display:block;font-size:17px;line-height:1.5}
/* Connections group bricks use the light group color */
.flip[data-grp] .back .tile-n{background:var(--lite);color:var(--ink)}
.flip[data-grp] .front{background:var(--g-tint);border-color:var(--g-line);box-shadow:0 4px 0 var(--g-deep)}
.flip[data-grp] .front .tile-n{background:var(--lite);color:var(--ink);border-color:color-mix(in oklab,var(--lite) 70%,#000)}
.grp-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:2px 0 4px}
.grp-head b{font:700 13px/1.3 var(--font-b);color:var(--ink-2)}
.ladder{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.ladder li[hidden]{display:none}
.ladder .vague{font-size:16.5px;line-height:1.5}
.ladder .cat{font:800 18px/1.25 var(--font-d)}
.ladder .chipset span{padding:3px 8px;border-radius:6px;background:var(--lite);font:700 12.5px/1.35 var(--font-b);text-transform:uppercase}
.more{margin-top:10px;display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:9px;border:2px solid color-mix(in oklab,var(--g) 60%,#000);background-color:var(--g-deep);background-image:radial-gradient(rgba(255,255,255,.13) 1px, transparent 1.2px);background-size:9px 9px;font:700 14px/1 var(--font-b);color:#fff;cursor:pointer;box-shadow:0 3px 0 color-mix(in oklab,var(--g) 50%,#000), inset 0 1px 0 rgba(255,255,255,.22)}
.more:active{transform:translateY(2px);box-shadow:0 1px 0 color-mix(in oklab,var(--g) 50%,#000)}
.dots{display:flex;gap:3px}
.dots i{width:8px;height:8px;border-radius:2px;background:var(--face);border:1px solid color-mix(in oklab,var(--lite) 70%,#000)}
.dots i.on{background:var(--lite)}

/* the answer brick: last in the stack, quieter than the hints until you hold it */
.answer-brick{margin-top:4px;touch-action:none;user-select:none;-webkit-user-select:none}
.answer-brick .back{background:var(--face);background-image:repeating-linear-gradient(-45deg, transparent 0 7px, rgba(31,27,45,.045) 7px 9px);color:var(--ink);border:2px solid var(--line);box-shadow:0 4px 0 var(--edge);overflow:hidden}
.answer-brick .back .tile-n{background:var(--ink);color:#fff}
.answer-brick .back .t small,.answer-brick .back .go{color:var(--ink-2)}
.answer-brick .fill{position:absolute;inset:0;background:linear-gradient(var(--g-deep),var(--g-deep)) bottom/100% 5px no-repeat, color-mix(in oklab,var(--g) 22%,transparent);transform:scaleX(0);transform-origin:left;transition:transform 160ms ease-out;pointer-events:none}
.answer-brick .back .t{position:relative;z-index:1}
.answer-brick .back .tile-n{position:relative;z-index:1}
.answer-brick .now{display:none}
.answer-brick.holding .now{display:block}
.answer-brick.holding .idle{display:none}
.answer-brick.nudge .flip-in{animation:nudge 360ms ease}
@keyframes nudge{20%{transform:translateX(-5px)}45%{transform:translateX(4px)}70%{transform:translateX(-2px)}}
.answer-brick.holding .fill{transform:scaleX(1);transition:transform 900ms linear}
.answer-brick .back{transition:box-shadow 160ms ease}
.answer-brick.holding:not(.is-open) .flip-in{transform:translateY(3px) scaleY(.97);transition:transform 900ms cubic-bezier(.2,.7,.3,1)}
.answer-brick.holding:not(.is-open) .back{box-shadow:0 1px 0 var(--edge);transition:box-shadow 900ms linear}
.answer-brick .front{display:block}
.answer-word{font:800 34px/1 var(--font-d);letter-spacing:.06em;color:var(--g-deep);margin:4px 0 10px}
.answer-brick .front p{margin:0 0 8px}
.answer-brick .front p:last-child{margin:0}
.answer-brick .front .lbl{margin-bottom:4px}
.why{display:flex;flex-direction:column;gap:9px}
.why p{margin:0;font-size:15.5px;line-height:1.5}
.why .chip{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:7px;vertical-align:-1px}
.why em{font-style:normal;font-weight:700}

/* wordle strip */
.strip{display:flex;gap:8px;justify-content:center;margin:16px 0 0}
.strip .sq{width:52px;height:52px;perspective:500px}
.strip .sq > div{width:100%;height:100%;display:grid;transform-style:preserve-3d;transition:transform 380ms cubic-bezier(.3,1.3,.5,1)}
.strip .sq span{grid-area:1/1;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:10px;display:grid;place-items:center;font:800 26px/1 var(--font-d)}
.strip .sq span:first-child{background:var(--face);border:2px solid var(--line);box-shadow:0 3px 0 var(--edge);color:var(--ink-3);font-size:15px}
.strip .sq span:last-child{transform:rotateX(180deg);background:var(--face);color:var(--ink);border:2px solid var(--g-line);box-shadow:0 4px 0 var(--g-deep)}
.strip .sq.on > div{transform:rotateX(180deg)}

/* connections board */
.board{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:14px}
.word{
  min-height:44px;display:grid;place-items:center;text-align:center;padding:4px 6px;border-radius:9px;background:var(--face);
  border:2px solid var(--line);box-shadow:0 3px 0 var(--edge);font:700 11.5px/1.05 var(--font-b);text-transform:uppercase;
  transition:background 260ms ease, border-color 260ms ease, box-shadow 260ms ease, transform 260ms cubic-bezier(.3,1.4,.5,1)
}
.word.hit{transform:translateY(-3px) scale(1.05)}
.word[data-c]{background:color-mix(in oklab,var(--lite) 22%,var(--face));border-color:var(--lite);box-shadow:0 4px 0 color-mix(in oklab,var(--lite) 62%,#000)}
.word[data-c=yellow]{--lite:var(--c-yellow)} .word[data-c=green]{--lite:var(--c-green)} .word[data-c=blue]{--lite:var(--c-blue)} .word[data-c=purple]{--lite:var(--c-purple)}

/* below the answer: quieter reference zone */
.ref{margin-top:34px;border-top:1px solid var(--line)}
.ref h2{font:700 15px/1.3 var(--font-b);color:var(--ink-2);margin:22px 0 8px}
.ref .prose{font-size:15px;line-height:1.6;color:var(--ink-2)}
.ref .prose p{margin:0}
.faq details{border-top:1px solid var(--line);padding:11px 0}
.faq details:first-child{border-top:0}
.faq summary{cursor:pointer;font:600 15px/1.4 var(--font-b);color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:700 18px/1 var(--font-d);color:var(--ink-3)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:6px 0 0;color:var(--ink-2);font-size:15px}

@media (min-width:720px){
  .deck{grid-template-columns:repeat(3,1fr);gap:18px 16px}
  .brick.wide{grid-column:auto;flex-direction:column;gap:10px;min-height:148px}
  .brick.wide .body{gap:10px}
  .home-head h1{font-size:38px}
  .band h1{font-size:28px}
  .word{min-height:56px;font-size:13.5px}
  .games-rail{flex-wrap:wrap;overflow:visible}
}
@media (min-width:960px){.deck{grid-template-columns:repeat(4,1fr)}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0ms !important;animation:none !important}
}

/* round 3 additions */
.ladder .why{display:block;font-size:15px;line-height:1.5;color:var(--ink-2);margin-top:2px}
.ladder .why em{font-style:normal;font-weight:700;color:var(--ink)}
.solved .ladder .words .chipset{display:none}
.ladder .chipset{display:flex;flex-wrap:wrap;gap:5px}
.ladder li.words{display:block}
.ladder li.words[hidden]{display:none}
.done-note{display:block;font-size:16px;line-height:1.5}
.done-note a{font-weight:700}
@media (min-width:720px){.games-rail{-webkit-mask-image:none;mask-image:none}}
.band h1 .num{white-space:nowrap}
.done-note a{white-space:nowrap}
.answer-brick .back .t small.now{display:none}
.answer-brick.holding .back .t small.now{display:block}
.answer-brick.holding .back .t small.idle{display:none}

/* ============ D3 线上落地（proto.css 之上追加，不改上面的真源） ============ */
/* 自托管字体（可变字体，两族两文件；OFL 见 /fonts/OFL-*.txt） */
@font-face{
  font-family:"Bricolage Grotesque";font-style:normal;font-weight:700 800;font-display:swap;
  src:url(/fonts/BricolageGrotesque-var.woff2) format("woff2");
}
@font-face{
  font-family:"Inter";font-style:normal;font-weight:400 700;font-display:swap;
  src:url(/fonts/Inter-var.woff2) format("woff2");
}

/* 答案砖用原生 details 承载（无 JS 也能点开；有 JS 时接管为按住揭晓） */
details.answer-brick{position:relative;display:block;cursor:pointer;perspective:1100px;-webkit-tap-highlight-color:transparent;border-radius:var(--r);touch-action:none;user-select:none;-webkit-user-select:none;margin-top:4px}
details.answer-brick > summary{list-style:none;display:flex;align-items:center;gap:14px;padding:12px 14px;min-height:64px;border-radius:var(--r);
  background:var(--face);background-image:repeating-linear-gradient(-45deg, transparent 0 7px, rgba(31,27,45,.045) 7px 9px);color:var(--ink);border:2px solid var(--line);box-shadow:0 4px 0 var(--edge);overflow:hidden;position:relative;transform-style:preserve-3d;transition:transform var(--flip), box-shadow 160ms ease}
details.answer-brick > summary::-webkit-details-marker{display:none}
details.answer-brick > summary .tile-n{background:var(--ink);color:#fff;position:relative;z-index:1}
details.answer-brick > summary .t{position:relative;z-index:1}
details.answer-brick > summary .t b,details.answer-brick > summary .t small{display:block}
details.answer-brick > summary .t small.now{display:none}
details.answer-brick.holding > summary .t small.now{display:block}
details.answer-brick.holding > summary .t small.idle{display:none}
details.answer-brick > summary .t b{font:700 16px/1.25 var(--font-b)}
details.answer-brick > summary .t small{font-size:13px;line-height:1.35;color:var(--ink-2);margin-top:1px}
details.answer-brick .front .lbl{font:800 16px/1.3 var(--font-d);color:var(--g-deep)}
details.answer-brick > summary .t small,details.answer-brick summary .go{color:var(--ink-2)}
details.answer-brick .fill{position:absolute;inset:0;background:linear-gradient(var(--g-deep),var(--g-deep)) bottom/100% 5px no-repeat, color-mix(in oklab,var(--g) 22%,transparent);transform:scaleX(0);transform-origin:left;transition:transform 160ms ease-out;pointer-events:none}
details.answer-brick .now{display:none}
details.answer-brick.holding .now{display:block}
details.answer-brick.holding .idle{display:none}
details.answer-brick.nudge > summary{animation:nudge 360ms ease}
details.answer-brick.holding .fill{transform:scaleX(1);transition:transform 900ms linear}
details.answer-brick.holding:not(.is-open) > summary{transform:translateY(3px) scaleY(.97);box-shadow:0 1px 0 var(--edge);transition:transform 900ms cubic-bezier(.2,.7,.3,1), box-shadow 900ms linear}
details.answer-brick > .front{display:none}
details.answer-brick.is-open > summary{position:absolute;inset:0;transform:rotateX(-180deg);pointer-events:none}
details.answer-brick.is-open > .front{display:block;position:relative;transform:rotateX(0deg);animation:ansflip 440ms cubic-bezier(.3,1.35,.5,1)}
@keyframes ansflip{from{transform:rotateX(-180deg)}to{transform:rotateX(0)}}
.answer-word{font:800 34px/1 var(--font-d);letter-spacing:.06em;color:var(--g-deep);margin:4px 0 10px}
details.answer-brick .front p{margin:0 0 8px}
details.answer-brick .front p:last-child{margin:0}
details.answer-brick .front .lbl{display:block;color:var(--g-deep);margin:1px 0 4px}
details.answer-brick .front .say{font-size:16px;line-height:1.5}
.why{display:flex;flex-direction:column;gap:9px}
.why p{margin:0;font-size:15.5px;line-height:1.5}
.why em{font-style:normal;font-weight:700}

/* Strands 答案字母盘：套砖面语法 */
.strands-grid{display:grid;gap:4px;max-width:340px;margin:10px 0 4px}
.strands-grid .cell{display:flex;align-items:center;justify-content:center;aspect-ratio:1;border-radius:8px;background:var(--face);border:2px solid var(--line);box-shadow:0 3px 0 var(--edge);font:700 13px/1 var(--font-b)}
.strands-grid .cell.spangram{background:var(--g-deep);color:#fff;border-color:color-mix(in oklab,var(--g) 60%,#000);box-shadow:0 3px 0 color-mix(in oklab,var(--g) 50%,#000)}
.strands-grid .cell.w0{background:color-mix(in oklab,var(--strands) 16%,var(--face));border-color:var(--g-line)}
.strands-grid .cell.w1{background:color-mix(in oklab,var(--strands) 10%,var(--face));border-color:var(--g-line)}
.strands-grid .cell.w2{background:color-mix(in oklab,var(--strands) 22%,var(--face));border-color:var(--g-line)}

/* SB 两字母表/首字母网格、Pips 解法文本、Krillion 砖正面列表 */
.hint-table{display:flex;flex-wrap:wrap;gap:6px 10px;margin:6px 0 0}
.hint-table span{font:600 14.5px/1.4 var(--font-b);color:var(--ink)}
.hint-table span b{color:var(--g-deep)}
.front .say ul{margin:4px 0 0;padding-left:18px}
.front .say li{margin:2px 0}
.ans-list p{margin:0 0 8px;font-size:15.5px;line-height:1.5}
.ans-list b{color:var(--g-deep)}

/* 存档页/legal/404：chips + 桌面 */
.arc-head{padding:6px 0 14px}
.arc-list{display:flex;flex-direction:column;gap:18px;padding-bottom:26px}
.arc-list h2{font:800 18px/1.2 var(--font-d);margin:0 0 10px}
.arc-list .chips{flex-wrap:wrap;overflow:visible;-webkit-mask-image:none;mask-image:none;padding-bottom:4px}
.legal{padding:8px 0 40px}
.legal h1{font:800 28px/1.2 var(--font-d);margin:8px 0 14px}
.legal p{color:var(--ink-2);max-width:640px}

/* V3（D3 验收）：SB 蜂巢与 Pips 解法网格 */
.hive{display:inline-flex;flex-direction:column;align-items:center;gap:5px;margin:2px 0 2px}
.hive-row{display:flex;gap:5px}
.hive-cell{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;font:800 18px/1 var(--font-d);background:var(--face);border:2px solid var(--line);box-shadow:0 3px 0 var(--edge)}
.hive-cell.center{background:var(--g);border-color:color-mix(in oklab,var(--g) 60%,#000);color:#fff;box-shadow:0 3px 0 color-mix(in oklab,var(--g) 50%,#000)}
/* D4-a：骨牌整砖（绝对定位）；中线 1px 分开两点数；砖间桌面缝 5px */
.pips-board{position:relative;display:inline-block;margin:4px 0 12px}
.domino{position:absolute;display:flex;border-radius:9px;background:var(--g-tint);border:2px solid var(--g-line);box-shadow:0 3px 0 var(--g-deep)}
.domino:not([data-h]){flex-direction:column}
.domino .pip{flex:1;display:grid;place-items:center;font:700 16px/1 var(--font-b);color:var(--g-deep)}
.domino .mid{flex:none;background:var(--g-line)}
.domino[data-h] .mid{width:1px;margin:6px 0}
.domino:not([data-h]) .mid{height:1px;margin:0 6px}