/* Hardware skin: blocks are screwed-on aluminium panels in a rack, graphs are black-on-white LCD screens.
   Layered over eski.css; layout untouched. Art (hex screw, grain) made with Higgsfield, in art/. */
:root{
  --chassis:color-mix(in srgb,var(--bg) 80%,#000);
  --hl:rgba(255,255,255,.9); --edge:rgba(0,0,0,.12); --drop:rgba(0,0,0,.14);
  --screen:color-mix(in srgb,#e9ebe3 88%,var(--acc)); --trace:color-mix(in srgb,#15171a 82%,var(--acc)); --mark:var(--acc); /* the LCD takes a hint of the theme's accent */ /* resolved here, so a screen can redefine --acc/--ink from them */
  --screw:url(../art/screw-hex.png); --sz:8px; --so:4px;
  --screws:var(--screw) var(--so) var(--so)/var(--sz) no-repeat,var(--screw) right var(--so) top var(--so)/var(--sz) no-repeat,
           var(--screw) left var(--so) bottom var(--so)/var(--sz) no-repeat,var(--screw) right var(--so) bottom var(--so)/var(--sz) no-repeat;
  --metal:url(../art/grain.jpg) 0 0/256px,linear-gradient(180deg,color-mix(in srgb,var(--panel) 92%,#fff),color-mix(in srgb,var(--panel) 96%,#000));
  /* a key: flat cap, a visible darker skirt below it, a shadow under that */
  --key:linear-gradient(180deg,color-mix(in srgb,var(--panel) 70%,#fff),var(--panel));
  --key-sh:inset 0 1px 0 var(--hl),0 0 0 1px rgba(0,0,0,.14),0 2px 0 color-mix(in srgb,var(--panel) 55%,#000),0 3px 4px rgba(0,0,0,.18);
  --key-dn:inset 0 1px 2px rgba(0,0,0,.35),0 0 0 1px rgba(0,0,0,.2);
}
:root[data-skin="night"]{--hl:rgba(255,255,255,.07); --edge:rgba(0,0,0,.5); --drop:rgba(0,0,0,.5); --chassis:color-mix(in srgb,var(--bg) 60%,#000)}

/* a panel: grained metal, soft top light, darker lower lip, a little shadow, a screw in each corner */
.blk,.target,.phr,.score,.mt,.bstat,.lvl,.kbd,.fl,.nav{
  background:var(--screws),var(--metal);background-blend-mode:normal,normal,normal,normal,soft-light,normal;
  box-shadow:inset 0 1px 0 var(--hl),inset 0 -1.5px 0 var(--edge),0 1px 2px var(--drop);
  border-radius:6px;
}
.nav{padding:10px 18px}
.phr,.score,.mt,.bstat,.lvl{padding-inline:16px}

/* the rack: thin dark seams between modules */
.board{gap:4px;padding:4px;background:var(--chassis);border-radius:8px;box-shadow:inset 0 1px 3px rgba(0,0,0,.3);overflow:visible}
.blk{padding:8px 12px 12px}
.blk header{padding-inline:4px}
.rows{margin-inline:-12px}
.r{padding:0 12px}
.blk.bmiss header{margin:-8px -12px 0;padding:0 16px;border-radius:6px 6px 0 0}
.board>#target,.board>#yours,.ec,.slot{border-radius:6px}
.blk.bhit{background:var(--screws),var(--hit)!important}

/* screens: glass recessed into the panel, every trace in the one colour, markers and playheads in --mark */
.gw{background:var(--screen);border-radius:3px;padding:3px 0;
  box-shadow:inset 0 2px 3px rgba(0,0,0,.28),0 0 0 1px rgba(0,0,0,.25),0 1px 0 var(--hl);
  --ink:var(--trace); --acc:var(--mark); --gl:color-mix(in srgb,var(--trace) 9%,transparent); --mute:color-mix(in srgb,var(--trace) 45%,transparent); --panel:var(--screen); --cell:var(--screen)}
.gw::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;background:linear-gradient(180deg,rgba(0,0,0,.05),transparent 30%)}
/* a solved block keeps its all-green look */
.blk.bhit .gw{background:var(--cell);box-shadow:inset 0 2px 4px rgba(0,0,0,.15);--ink:#fff;--acc:#fff;--gl:rgba(255,255,255,.25);--panel:var(--hit);--cell:rgba(255,255,255,.14);--mute:rgba(255,255,255,.85)}
.blk.bhit .gw::after{display:none}
.blk>.ro{top:34px;right:17px;color:var(--trace);background:color-mix(in srgb,var(--screen) 75%,transparent)}

/* step sliders: a row of small keys, lit ones dark and pressed in */
.sqs{gap:2.5px}
.sqs i{border-radius:1.5px;background:linear-gradient(180deg,var(--tint),var(--tint2));box-shadow:inset 0 1px 0 rgba(255,255,255,.35),0 1px 0 color-mix(in srgb,var(--tint2) 60%,#000)}
.sqs i.z{box-shadow:none}
.sqs i.on{background:var(--ink);box-shadow:inset 0 1px 1px rgba(0,0,0,.5)}
.sqs i.tried{background:var(--near)}
/* option buttons and arrows: real keys with a skirt; the chosen option is pushed down and dark */
.opts{gap:3px}
.opts button,.stp,.dd{border-radius:3px;background:var(--key);box-shadow:var(--key-sh);margin-bottom:2px}
.opts button:hover:not(:disabled),.dd:hover:not(:disabled){background:var(--key);filter:brightness(1.03)}
.dd:active:not(:disabled){transform:translateY(1.5px);box-shadow:var(--key-dn)}
.opts button[aria-pressed="true"]{background:var(--ink);color:var(--panel);box-shadow:var(--key-dn);transform:translateY(1.5px)}
.stp button:active:not(:disabled){transform:translateY(1px)}
/* graded rows keep their flat feedback colours */
.r.hit .sqs i,.r.near .sqs i,.r.miss .sqs i{box-shadow:none;background:rgba(255,255,255,.3)}
.r.hit .sqs i.on,.r.near .sqs i.on,.r.miss .sqs i.on{background:#fff}
.r.hit .opts button,.r.near .opts button,.r.miss .opts button,.r.hit .stp,.r.near .stp,.r.miss .stp,.r.hit .dd,.r.near .dd,.r.miss .dd{box-shadow:0 2px 0 rgba(0,0,0,.18);background:rgba(255,255,255,.22)}
.r.hit .opts button[aria-pressed="true"],.r.near .opts button[aria-pressed="true"],.r.miss .opts button[aria-pressed="true"]{background:#fff;box-shadow:none}

/* Target and Output: plain panels like the rest, a round accent play key and a screen */
.target,.yours,.yours.empty{color:var(--ink)}
.target .th span,.target .th em{color:var(--mute);opacity:1}
.board>#target kbd,.board>#yours kbd,.yours kbd{background:var(--tint);color:var(--ink);border-radius:2px}
.target.playing .th b,.yours.playing .th b{color:var(--acc)}
.tbtn2,.yours .tbtn2{background:linear-gradient(180deg,color-mix(in srgb,var(--acc) 80%,#fff),var(--acc));color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.3),0 0 0 1px rgba(0,0,0,.12),0 2px 0 color-mix(in srgb,var(--acc) 55%,#000),0 3px 4px rgba(0,0,0,.2)}
.tbtn2:active{transform:translateY(1.5px);box-shadow:inset 0 1px 2px rgba(0,0,0,.3)}
/* the library's play buttons: an even shadow all round, so the ring sits centred on the button */
.lplay{box-shadow:inset 0 1px 0 rgba(255,255,255,.3),0 0 0 1px rgba(0,0,0,.14),0 1px 4px rgba(0,0,0,.22)}.lplay:active{transform:translateY(calc(-50% + 1px))}
.subq .lplay:active{transform:translateY(1px)} /* the queue's buttons sit in the row, not centred on a tile: press down, don't jump up */
.yours.empty .tbtn2{background:var(--tint2);color:var(--mute);box-shadow:none}
.target .tw,.board>#target .tw,.board>#yours .tw{background:var(--screen);border-radius:3px;isolation:isolate;box-shadow:inset 0 2px 3px rgba(0,0,0,.28),0 0 0 1px rgba(0,0,0,.25),0 1px 0 var(--hl)}
.yours.empty .tw{background:var(--cell);box-shadow:inset 0 1px 3px var(--drop)}
.yours .yempty{color:var(--mute)}
/* the waveforms are drawn white for the old dark cards; inverted, they're black on the LCD */
.target:not(.empty) .tw canvas{filter:invert(1)}
#tw,#yw{filter:drop-shadow(0 0 0 #fff) invert(1)} /* the unplayed wave is drawn at 32% alpha; a stacked copy darkens it */
/* level meter and volume: grey wells, accent volume */
.lmb{background:var(--tint);box-shadow:inset 0 1px 2px var(--drop);border-radius:2px}
.lmb .r,.lmb .p{background:var(--ink);border-radius:2px}
.ov input{border-radius:2px;background:linear-gradient(var(--acc),var(--acc)) 0/calc(var(--v,.5)*100%) 100% no-repeat,var(--tint);box-shadow:inset 0 1px 2px var(--drop)}
.ov input::-webkit-slider-thumb{width:10px;height:16px;border-radius:2px;background:var(--key);box-shadow:var(--key-sh)}
.ov input::-moz-range-thumb{width:10px;height:16px;border-radius:2px;background:var(--panel)}
.ov input:focus-visible{outline-color:var(--acc)}
/* the phrase gets a screen too */
.phr .pr{background:var(--screen);border-radius:3px;padding:4px;box-sizing:border-box;box-shadow:inset 0 2px 3px rgba(0,0,0,.28),0 0 0 1px rgba(0,0,0,.25),0 1px 0 var(--hl);--ink:var(--trace);--acc:var(--mark);--gl:color-mix(in srgb,var(--trace) 10%,transparent)}

/* every other button is a key too: less round, a skirt, and it goes down when pressed */
.qb,.tool,.sbtn,.subm,.chip{border-radius:4px;transition:transform .05s}
.qb{background:linear-gradient(180deg,color-mix(in srgb,var(--tgt) 80%,#fff),var(--tgt));box-shadow:inset 0 1px 0 rgba(255,255,255,.15),0 2px 0 #000,0 3px 4px rgba(0,0,0,.25)}
.qb.y{background:linear-gradient(180deg,color-mix(in srgb,var(--acc) 80%,#fff),var(--acc));box-shadow:inset 0 1px 0 rgba(255,255,255,.25),0 2px 0 color-mix(in srgb,var(--acc) 55%,#000),0 3px 4px rgba(0,0,0,.25)}
.tool,.sbtn,.chip{background:var(--key);box-shadow:var(--key-sh)}
.tool:hover:not(:disabled),.sbtn:hover,.chip:hover:not(:disabled){background:var(--key);filter:brightness(1.03)}
.tool[aria-pressed="true"],.tool[aria-pressed="true"]:hover{background:var(--ink);color:var(--panel);box-shadow:var(--key-dn);transform:translateY(1.5px)}
.subm{background:linear-gradient(180deg,color-mix(in srgb,var(--ink) 80%,#fff),var(--ink));box-shadow:inset 0 1px 0 rgba(255,255,255,.15),0 3px 0 #000,0 4px 6px rgba(0,0,0,.25);margin-bottom:3px}
:is(.qb,.tool,.sbtn,.subm,.chip):active:not(:disabled){transform:translateY(2px);box-shadow:var(--key-dn)}
.skins button[aria-pressed="true"],.seg2 button[aria-pressed="true"],.dtab[aria-current="true"]{border-radius:3px;box-shadow:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.2),0 1px 2px var(--drop)}
.dtabs,.skins,.seg2{border-radius:4px;box-shadow:inset 0 1px 2px var(--drop)}
.target .th b,.blk h3,.sh h2,.score .k,.auxh,.sk{letter-spacing:.12em}

/* the top row looks like the difficulty switcher: buttons are raised tabs in a sunken grey track */
.seg{display:inline-flex;align-items:center;gap:3px;padding:3px;background:var(--tint);border-radius:4px;box-shadow:inset 0 1px 2px var(--drop)}
.seg .qb,.seg .tool,.seg .qb.y{height:26px;min-width:26px;border-radius:3px;background:var(--panel);color:var(--ink);font-size:12.5px;
  box-shadow:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.2),0 1px 2px var(--drop);filter:none;transform:none}
.seg .qb{padding:0 10px 0 8px}
.seg .qb .ic{color:var(--acc)}
.seg :is(.qb,.tool):hover:not(:disabled){background:var(--panel);filter:brightness(1.03)}
.seg :is(.qb,.tool)[aria-pressed="true"],.seg :is(.qb,.tool)[aria-pressed="true"]:hover{background:var(--panel);color:var(--acc);box-shadow:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.2),0 0 0 1.5px var(--acc);transform:none}
.seg :is(.qb,.tool):active:not(:disabled){transform:translateY(1px);box-shadow:inset 0 1px 2px rgba(0,0,0,.25)}
.seg :is(.qb,.tool):disabled{background:transparent;box-shadow:none;color:var(--mute);opacity:.6}

/* every other (non-synth) button is a raised tab in its own little track, like the top row and the difficulty switcher */
:is(.subm,.sbtn,.btn,.chip,.banner .lnk,.thm){--tab-sh:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.2),0 1px 2px var(--drop),0 0 0 3px var(--tint),0 0 0 4px color-mix(in srgb,var(--tint) 70%,#000 6%)}
:is(.subm,.sbtn,.btn,.chip,.banner .lnk){background:var(--panel);color:var(--ink);border-radius:3px;box-shadow:var(--tab-sh);margin:4px;filter:none;transform:none;text-decoration:none}
.subm .ic,.btn .ic,.chip .ic{color:var(--acc)}
.banner .lnk{display:inline-flex;align-items:center;height:26px;padding:0 10px;font-size:12.5px}
.banner .lnk.sub{color:var(--mute)}
.btn.pri{background:var(--panel);color:var(--acc)}
:is(.subm,.sbtn,.btn,.chip,.banner .lnk):hover:not(:disabled){background:var(--panel);filter:brightness(1.03)}
:is(.subm,.sbtn,.btn,.chip,.banner .lnk):active:not(:disabled){transform:translateY(1px);box-shadow:inset 0 1px 2px rgba(0,0,0,.25),0 0 0 3px var(--tint),0 0 0 4px color-mix(in srgb,var(--tint) 70%,#000 6%)}
:is(.subm,.sbtn,.btn,.chip):disabled{background:var(--tint);color:var(--mute);box-shadow:0 0 0 3px var(--tint),0 0 0 4px color-mix(in srgb,var(--tint) 70%,#000 6%);opacity:1}
.subm{margin:4px 4px 6px}
.thm{border-radius:4px;box-shadow:var(--tab-sh);margin:4px}
.thm[aria-pressed="true"]{background:var(--panel);color:var(--acc);box-shadow:var(--tab-sh),0 0 0 6px var(--acc)}

/* Learn, Profile and the library: the same screwed-on panels, sunken wells and tab keys */
.pacct,.pst,.pby,.srows,.plist,.ltask,.lsteps,.ltile,.dcard,.mbox{
  background:var(--screws),var(--metal);background-blend-mode:normal,normal,normal,normal,soft-light,normal;
  box-shadow:inset 0 1px 0 var(--hl),inset 0 -1.5px 0 var(--edge),0 1px 2px var(--drop);border-radius:6px;color:var(--ink)}
.pacct,.pby,.ltask,.ltile,.dcard{padding-inline:22px}
.srows{gap:0}.srow{background:none;border-top:1px solid var(--edge);padding-inline:22px}.srow:first-child{border-top:none}
/* the step list is a track of tabs, the current step raised */
.lsteps{padding:6px;background:var(--tint);box-shadow:inset 0 1px 2px var(--drop);border-radius:4px}
.lsteps button{border-radius:3px}
.lsteps button:hover{background:color-mix(in srgb,var(--panel) 50%,transparent)}
.lsteps button[aria-current="true"]{background:var(--panel);box-shadow:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.2),0 1px 2px var(--drop)}
.ln{border-radius:3px;background:var(--panel);box-shadow:0 1px 0 rgba(0,0,0,.15)}
/* progress bars and text fields are sunken wells */
.lbar,.plb,.field,.psign .field,.cjson{background:var(--tint);border-radius:3px;box-shadow:inset 0 1px 2px var(--drop)}
.lbar i,.plb i{border-radius:2px}
/* switches: a sunken slot with a raised knob */
.tg{border-radius:4px;background:var(--tint);box-shadow:inset 0 1px 2px var(--drop)}
.tg i{border-radius:3px;background:var(--panel);box-shadow:inset 0 1px 0 var(--hl),0 1px 0 rgba(0,0,0,.25),0 1px 2px var(--drop)}
.tg[aria-pressed="true"]{background:var(--acc)}
/* the old black cards become panels with the title on an LCD */
.dcard h3{background:var(--screen);color:var(--trace);padding:4px 10px;border-radius:3px;box-shadow:inset 0 2px 3px rgba(0,0,0,.28),0 0 0 1px rgba(0,0,0,.25)}
.dcard p,.dcard .cnt,.dcard .stars em{color:var(--mute);opacity:1}
.dcard .stars{color:var(--tint2)}.dcard .stars i.on{color:var(--ink)}
.dcard .solved{color:var(--hit)}
.dcard .btn{background:var(--panel);color:var(--ink)}
.pav{border-radius:6px;box-shadow:inset 0 1px 0 rgba(255,255,255,.3),0 2px 0 color-mix(in srgb,var(--acc) 55%,#000)}
/* on dark panels the grain reads as grit: plain gradient there */
:root[data-skin="night"]{--metal:linear-gradient(180deg,color-mix(in srgb,var(--panel) 92%,#fff),color-mix(in srgb,var(--panel) 96%,#000))}
.tg i{background:color-mix(in srgb,var(--panel) 75%,#fff)}
/* admin lists: room for the corner screws */
.plist{padding:12px}
.subm{flex:none} /* a long sidebar (Create) would otherwise squash it */