.card{background:var(--surface-raised);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);padding:22px;box-shadow:none}
.card + .card{margin-top:18px}

.sec-title{display:flex;align-items:center;gap:12px;margin:34px 0 16px}
.sec-title .bar{
width:4px;height:28px;border-radius:2px;
background:var(--accent);
box-shadow:0 0 12px color-mix(in srgb,var(--accent) 35%,transparent);
}
.sec-title h2{font-size:calc(21px * var(--fs-scale, 1));font-weight:800}
.sec-title small{color:var(--text-tertiary);font-size:calc(12.5px * var(--fs-scale, 1));font-weight:400}

.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{padding:6px 15px;border-radius:999px;background:var(--surface-nested);border:1px solid var(--border-subtle);font-size:calc(13px * var(--fs-scale, 1));color:var(--text-primary);transition:.2s}
.chip:hover{border-color:var(--border-strong)}
.chip.hl{border-color:color-mix(in srgb,var(--accent) 35%,var(--border-subtle));background:color-mix(in srgb,var(--accent) 12%,var(--surface-raised));color:var(--text-primary)}

.badge{display:inline-block;padding:2.5px 11px;border-radius:999px;font-size:calc(11px * var(--fs-scale, 1));font-weight:700;border:1px solid}
.b-vio{color:var(--color-violet);border-color:rgba(167,139,250,.4);background:rgba(167,139,250,.1)}
.b-blu{color:var(--color-blue);border-color:rgba(96,165,250,.4);background:rgba(96,165,250,.1)}
.b-cyn{color:var(--color-cyan);border-color:rgba(34,211,238,.4);background:rgba(34,211,238,.1)}
.b-grn{color:var(--color-green);border-color:rgba(52,211,153,.4);background:rgba(52,211,153,.1)}
.b-amb{color:var(--color-amber);border-color:rgba(251,191,36,.4);background:rgba(251,191,36,.1)}
.b-ros{color:var(--color-rose);border-color:rgba(251,113,133,.4);background:rgba(251,113,133,.1)}

.btn{display:inline-flex;align-items:center;gap:8px;padding:9px 20px;border-radius:12px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.02);color:var(--text-primary);font-size:calc(13.5px * var(--fs-scale, 1));font-weight:600;box-shadow:none;transition:.2s}
.btn:hover{border-color:rgba(255,255,255,.16);background:rgba(255,255,255,.04)}
.btn.g{
background:var(--accent);
color:var(--text-on-accent);
border:1px solid transparent;font-weight:800;
box-shadow:none;
}
.btn.g:hover{
background:color-mix(in srgb,var(--accent) 85%,#fff);
box-shadow:0 4px 12px color-mix(in srgb,var(--accent) 20%,transparent);
}
.btn.done{background:color-mix(in srgb,var(--color-green) 14%,var(--surface-raised));border-color:color-mix(in srgb,var(--color-green) 45%,var(--border-subtle));color:var(--color-green)}
.navit.danger{color:var(--color-rose)}
.navit.danger:hover{background:rgba(251,113,133,.08);border-color:rgba(251,113,133,.4);color:var(--color-rose)}
.navit.danger .nn{color:var(--color-rose);background:rgba(251,113,133,.1);border-color:rgba(251,113,133,.25)}

.concept{position:relative;background:var(--surface-raised);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);padding:24px 24px 20px;margin-bottom:16px;overflow:hidden;
content-visibility:auto;contain-intrinsic-size:auto 220px}
.concept::before{
content:'';position:absolute;top:0;right:0;width:48px;height:2px;
background:var(--accent);opacity:.9;border-radius:0 0 2px 0;
}
.concept h3{display:flex;align-items:center;gap:11px;font-size:calc(16.5px * var(--fs-scale, 1));font-weight:800;margin-bottom:10px}
.concept h3 .idx{width:30px;height:30px;border-radius:10px;background:linear-gradient(135deg,rgba(139,92,246,.3),rgba(34,211,238,.2));border:1px solid rgba(139,92,246,.4);display:grid;place-items:center;font-size:calc(13px * var(--fs-scale, 1));color:var(--color-violet);flex-shrink:0}
.concept .def{color:var(--text-secondary);font-size:calc(var(--font-size-base) * 0.90);border-inline-start:3px solid rgba(139,92,246,.5);padding-inline-start:14px;margin-bottom:12px}
.concept ul.pts{list-style:none}
.concept ul.pts li{position:relative;padding-inline-start:24px;color:var(--text-primary);font-size:calc(var(--font-size-base) * 0.90);margin-bottom:7px}
.concept ul.pts li::before{content:'';position:absolute;right:6px;top:12px;width:8px;height:8px;border-radius:3px;background:linear-gradient(135deg,var(--color-cyan),var(--color-blue));transform:rotate(45deg)}
.exbox{margin-top:13px;padding:12px 16px;border-radius:13px;background:rgba(52,211,153,.07);border:1px solid rgba(52,211,153,.25);font-size:calc(var(--font-size-base) * 0.87);color:var(--ex-txt)}
.exbox b{color:var(--color-green)}
.notebox{margin-top:11px;padding:12px 16px;border-radius:13px;background:rgba(251,191,36,.07);border:1px solid rgba(251,191,36,.25);font-size:calc(var(--font-size-base) * 0.87);color:var(--note-txt)}

.fcard{position:relative;background:var(--surface-raised);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:15px;box-shadow:none;
transition:border-color .22s var(--ease-ios),box-shadow .25s var(--ease-ios),transform .25s var(--ease-ios);
content-visibility:auto;contain-intrinsic-size:auto 180px}
.fcard{--cat-clr:var(--color-blue)}
.fcard[data-cat="geometric"]{--cat-clr:var(--color-blue)}
.fcard[data-cat="waves"]{--cat-clr:var(--color-cyan)}
.fcard[data-cat="em"]{--cat-clr:var(--color-violet)}
.fcard[data-cat="quantum"]{--cat-clr:var(--color-rose)}
.fcard[data-cat="radiometry"]{--cat-clr:var(--color-amber)}
.fcard[data-cat="math"]{--cat-clr:var(--color-green)}
.fcard::before{content:"";position:absolute;inset-inline-start:0;top:0;bottom:0;width:3px;
background:linear-gradient(180deg,var(--cat-clr),transparent 85%);
opacity:.55;transition:opacity .2s var(--ease-ios),width .2s var(--ease-ios)}
.fcard:hover{
border-color:color-mix(in srgb,var(--cat-clr) 35%,var(--border-subtle));
box-shadow:0 10px 26px color-mix(in srgb,var(--cat-clr) 14%,transparent);
transform:translateY(-2px);}
.fcard:hover::before{opacity:1;width:4px}
.fcard .fhead{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 20px;border-bottom:1px solid var(--border-subtle)}
.fcard .fhead b{font-size:calc(14.5px * var(--fs-scale, 1))}
.fcard .ftex{direction:ltr;text-align:center;padding:20px 14px;background:transparent;overflow-x:auto;scrollbar-width:thin}
.fcard .ftex::-webkit-scrollbar{height:5px}
.fcard .ftex::-webkit-scrollbar-track{background:transparent}
.fcard .ftex::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:99px;border:none}
.fcard .fuse{padding:12px 20px 4px;font-size:calc(13.5px * var(--fs-scale, 1));color:var(--text-secondary)}
.fcard .fvars{padding:8px 20px 16px;display:flex;flex-wrap:wrap;gap:8px}
.fcard .fvars .v{display:inline-flex;align-items:center;gap:8px;background:var(--surface-nested);border:1px solid var(--border-subtle);border-radius:10px;padding:4px 12px;font-size:calc(12.5px * var(--fs-scale, 1))}
.fcard .fvars .v code{color:var(--color-cyan);font-weight:700;font-size:calc(13px * var(--fs-scale, 1))}
.fgrid{display:grid;grid-template-columns:minmax(0,1fr);gap:15px;width:100%}
.fgrid .fcard{
display:block;width:100%;
page-break-inside:avoid;
margin:0;
}

.tips ol{list-style:none;counter-reset:tip}
.tips ol li{counter-increment:tip;position:relative;padding:11px 52px 11px 16px;margin-bottom:9px;background:var(--surface-nested);border:1px solid var(--border-subtle);border-radius:13px;font-size:calc(var(--font-size-base) * 0.89);transition:.2s}
.tips ol li:hover{border-color:rgba(251,191,36,.4)}
.tips ol li::before{content:counter(tip,decimal);position:absolute;right:13px;top:50%;transform:translateY(-50%);width:27px;height:27px;border-radius:9px;background:linear-gradient(135deg,var(--color-amber),#f97316);color:#1a1206;display:grid;place-items:center;font-weight:800;font-size:calc(13px * var(--fs-scale, 1))}
.summary{border:1px solid transparent;background:linear-gradient(var(--surface-raised),var(--surface-raised)) padding-box,linear-gradient(90deg,rgba(167,139,250,.6),rgba(34,211,238,.5),rgba(251,191,36,.5)) border-box;font-size:calc(var(--font-size-base) * 0.935);line-height:2.1}
details.fn{background:var(--surface-recess);border:1px solid var(--border-subtle);border-radius:13px;padding:12px 18px;margin-top:14px;font-size:calc(13px * var(--fs-scale, 1));color:var(--text-secondary)}
details.fn summary{cursor:pointer;color:var(--text-tertiary);font-weight:600}
details.fn[open] summary{margin-bottom:8px;color:var(--color-violet)}
details.fn li{margin-inline-start:20px;margin-bottom:5px}

.shead{
  display:flex;gap:20px;align-items:center;flex-wrap:wrap;
  background:linear-gradient(135deg,
    color-mix(in srgb,var(--accent) 12%,var(--surface-raised)),
    var(--surface-raised) 70%);
  border:1px solid var(--border-strong);
  border-radius:22px;padding:26px;
}
.shead .num{
  width:86px;height:86px;border-radius:24px;
  background:var(--accent);
  color:var(--text-on-accent);
  display:grid;place-items:center;
  font-size:calc(38px * var(--fs-scale, 1));font-weight:800;
  box-shadow:0 10px 30px color-mix(in srgb,var(--accent) 35%,transparent);
  flex-shrink:0;
}
.shead .num svg{width:44px;height:44px;display:block}
.shead h1{font-size:clamp(19px,2.6vw,26px);font-weight:800;line-height:1.6}
.shead .meta{display:flex;gap:9px;flex-wrap:wrap;margin-top:9px}
.shead .grow{flex:1;min-width:250px}

.diagram-card{background:var(--surface-recess);border:1px solid var(--border-subtle);border-radius:var(--radius);padding:20px;margin-bottom:15px}
.diagram-card h4{font-size:calc(14.5px * var(--fs-scale, 1));margin-bottom:12px;color:var(--color-cyan);display:flex;gap:8px;align-items:center}

.mmd{
  display:block;
  overflow-x:auto;
  overflow-y:hidden;
  text-align:center;
  padding:4px 0;
  scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.mmd::-webkit-scrollbar{height:6px}
.mmd::-webkit-scrollbar-thumb{
  background:color-mix(in srgb,var(--text-primary) 22%,transparent);
  border-radius:99px;
}
.mmd::-webkit-scrollbar-track{background:transparent}
.mmd > svg{
  display:inline-block;
  vertical-align:top;
  max-width:none;
}

.tbl{width:100%;border-collapse:collapse;font-size:calc(13.3px * var(--fs-scale, 1))}
.tbl th{background:var(--surface-nested);color:var(--color-cyan);padding:9px 14px;text-align:right;border-bottom:2px solid var(--border-strong)}
.tbl td{padding:9px 14px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}
.tbl td:first-child{color:var(--text-primary);font-weight:600}
.read-glow{
  position:fixed;
  bottom:0;left:0;right:0;
  height:3px;
  background:transparent;
  z-index:58;
  pointer-events:none;
  opacity:0;
  transition:opacity .25s var(--ease-ios);
}
.read-glow.show{opacity:1}
.read-glow > i{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin: right center;
  background:var(--accent);
  box-shadow: none;
}

.set-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0;border-bottom:1px solid var(--border-subtle);flex-wrap:wrap}
.set-row:first-child{padding-top:0}
.set-row:last-child{border-bottom:none;padding-bottom:0}

.set-input{
  flex:0 1 auto;min-width:200px;max-width:280px;
  padding:.55rem .85rem;
  border-radius:var(--radius-sm,10px);
  border:1px solid var(--border-subtle);
  background:var(--surface-recess);
  color:var(--text-primary);
  font-family:inherit;font-size:calc(13.5px * var(--fs-scale, 1));line-height:1.5;
  outline:none;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.set-input:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent);
}
.set-input::placeholder{color:var(--text-tertiary)}
@media (max-width:560px){
  .set-input{max-width:none;width:100%}
}
.set-info{flex:1;min-width:200px}
.set-info b{display:block;font-size:calc(14.5px * var(--fs-scale, 1));margin-bottom:3px;font-weight:700}
.set-info span{color:var(--text-secondary);font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.7}
.set-seg{flex-shrink:0;min-width:180px}
.set-seg button{padding:8px 14px}

.set-stat{display:flex;gap:12px;flex-wrap:wrap;background:var(--surface-nested);border:1px solid var(--border-subtle);border-radius:12px;padding:14px 16px;margin-bottom:16px}
.set-stat > div{flex:1;min-width:140px;display:flex;flex-direction:column;gap:3px}
.set-stat > div > span{font-size:calc(11.5px * var(--fs-scale, 1));color:var(--text-tertiary)}
.set-stat > div > b{font-size:calc(16px * var(--fs-scale, 1));font-weight:800;color:var(--color-cyan)}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.icon-btn{position:relative}

.set-seg.cards{display:grid;grid-template-columns:repeat(3,72px);gap:8px;min-width:0}
.set-seg.cards button{display:flex;align-items:center;justify-content:center;padding:14px 6px;border-radius:13px;color:var(--text-secondary)}
.set-seg.cards .seg-ic{width:22px;height:22px;display:grid;place-items:center}
.set-seg.cards .seg-ic svg{width:100%;height:100%}
.set-seg.cards button.on{color:var(--color-violet);border-color:rgba(139,92,246,.55);background:linear-gradient(160deg,rgba(139,92,246,.14),rgba(34,211,238,.08))}

@media(max-width:560px){
.set-row{flex-direction:column;align-items:stretch;gap:10px}
.set-row .btn,.set-row .set-seg{width:100%}
.set-info{min-width:0}
.set-seg{display:flex}
.set-seg button{flex:1}
.set-seg.cards{grid-template-columns:repeat(3,1fr)}
.set-seg.swatches{grid-template-columns:repeat(5,1fr);justify-items:center}
}

.set-row-theme{
  flex-direction:column;
  align-items:stretch;
  gap:14px;
}
.theme-picker{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:12px;
  width:100%;
}
.theme-card{
  position:relative;
  display:flex;
  flex-direction:column;
  min-height:160px;
  padding:12px 12px 10px;
  border:1.5px solid var(--border-subtle);
  border-radius:14px;
  background:var(--surface-raised);
  color:var(--text-primary);
  font-family:inherit;
  text-align:start;
  cursor:pointer;
  overflow:hidden;
  transition:
    border-color .18s var(--ease-ios,ease),
    transform .18s var(--ease-ios,ease),
    box-shadow .22s var(--ease-ios,ease);
}
.theme-card:hover{
  border-color:var(--border-strong);
  box-shadow:0 6px 18px rgba(0,0,0,.08);
}
.theme-card:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.theme-card.on,
.theme-card[aria-pressed="true"]{
  border-color:var(--accent);
  box-shadow:
    0 0 0 1px var(--accent),
    0 6px 20px color-mix(in srgb,var(--accent) 22%,transparent);
}
.theme-card .tc-name{
  font-size:calc(14px * var(--fs-scale, 1));
  font-weight:800;
  color:var(--text-primary);
  line-height:1.4;
  margin-bottom:2px;
}
.theme-card .tc-hint{
  font-size:calc(11.5px * var(--fs-scale, 1));
  color:var(--text-secondary);
  line-height:1.55;
  margin-bottom:10px;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.theme-card .tc-preview{
  display:block;
  margin-top:auto;
  width:100%;
  aspect-ratio:5 / 3;
  border-radius:10px;
  overflow:hidden;
  border:1px solid var(--border-subtle);
  background:var(--surface-canvas);
}
.theme-card .tc-preview svg{
  display:block;
  width:100%;
  height:100%;
}

@media (max-width:560px){
  .theme-picker{grid-template-columns:1fr}
  .theme-card{min-height:140px}
}

.set-shell{
  display:grid;
  grid-template-columns:240px minmax(0,1fr);
  gap:24px;
  align-items:start;
}

.set-nav{
  position:sticky;
  top:88px;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:8px;
  background:var(--surface-raised);
  border:1px solid var(--border-subtle);
  border-radius:16px;
  max-height:calc(100vh - 112px);
  overflow-y:auto;
  scrollbar-width:thin;
}
.set-nav::-webkit-scrollbar{width:5px}
.set-nav::-webkit-scrollbar-thumb{
  background:color-mix(in srgb,var(--text-primary) 18%,transparent);
  border-radius:99px;
}

.set-nav-item{
  display:flex;
  align-items:center;
  gap:11px;
  padding:9px 12px;
  border-radius:10px;
  border:1px solid transparent;
  background:transparent;
  color:var(--text-secondary);
  font-family:inherit;
  font-size:calc(13.5px * var(--fs-scale, 1));
  font-weight:600;
  cursor:pointer;
  text-align:start;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
  width:100%;
  flex-shrink:0;
}
.set-nav-item:hover{
  background:var(--surface-nested);
  color:var(--text-primary);
}
.set-nav-item.on{
  background:color-mix(in srgb,var(--accent) 11%,transparent);
  border-color:color-mix(in srgb,var(--accent) 26%,var(--border-subtle));
  color:var(--text-primary);
}
.set-nav-item .sn-ic{
  width:20px;
  height:20px;
  flex-shrink:0;
  display:grid;
  place-items:center;
  color:var(--text-tertiary);
  transition:color .16s var(--ease);
}
.set-nav-item:hover .sn-ic{color:var(--text-secondary)}
.set-nav-item.on .sn-ic{color:var(--accent)}
.set-nav-item .sn-ic svg{width:100%;height:100%;display:block}
.set-nav-item .sn-lbl{
  flex:1;
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.set-panel{
  min-width:0;
  display:flex;
  flex-direction:column;
  gap:0;
}

.set-section{
  display:none;
  background:var(--surface-raised);
  border:1px solid var(--border-subtle);
  border-radius:20px;
  overflow:hidden;
}
.set-section.active {
  display: block;
  animation: fadeUp .28s var(--ease) both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

.set-section-head{
  display:flex;
  align-items:center;
  gap:14px;
  padding:22px 26px 18px;
  border-bottom:1px solid var(--border-subtle);
  cursor:default;
}
.set-section-head .sec-ic{
  width:44px;
  height:44px;
  border-radius:13px;
  display:grid;
  place-items:center;
  flex-shrink:0;
  background:color-mix(in srgb,var(--accent) 13%,var(--surface-nested));
  border:1px solid color-mix(in srgb,var(--accent) 28%,var(--border-subtle));
  color:var(--accent);
}
.set-section-head .sec-ic svg{width:22px;height:22px;display:block}
.set-section-head .sec-txt{flex:1;min-width:0}
.set-section-head .sec-txt b{
  display:block;
  font-size:calc(18px * var(--fs-scale, 1));
  font-weight:800;
  color:var(--text-primary);
  line-height:1.4;
  letter-spacing:-.01em;
}
.set-section-head .sec-txt small{
  display:block;
  font-size:calc(13px * var(--fs-scale, 1));
  color:var(--text-secondary);
  margin-top:3px;
  line-height:1.6;
}
.set-section-head .sec-chev{display:none}

.set-section-body{
  display:block;
  padding:6px 26px 20px;
}

@media (max-width:899px){
  .set-shell{
    grid-template-columns:1fr;
    gap:14px;
  }
  .set-nav{
    position:sticky;
    top:72px;
    z-index:15;
    flex-direction:row;
    flex-wrap:nowrap;
    overflow-x:auto;
    overflow-y:hidden;
    padding:6px;
    max-height:none;
    border-radius:14px;
    background:color-mix(in srgb,var(--surface-canvas) 92%,transparent);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    scrollbar-width:none;
        mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);
    -webkit-mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);
  }
  .set-nav::-webkit-scrollbar{display:none}
  .set-nav-item{
    flex-shrink:0;
    width:auto;
    padding:8px 14px;
    border-radius:10px;
    font-size:calc(13px * var(--fs-scale, 1));
  }
  .set-nav-item .sn-lbl{white-space:nowrap}
  .set-section-head{padding:18px 18px 14px;gap:12px}
  .set-section-head .sec-ic{width:38px;height:38px;border-radius:11px}
  .set-section-head .sec-ic svg{width:19px;height:19px}
  .set-section-head .sec-txt b{font-size:calc(16px * var(--fs-scale, 1))}
  .set-section-head .sec-txt small{font-size:calc(12.5px * var(--fs-scale, 1))}
  .set-section-body{padding:4px 18px 16px}
}

@media(max-width:1060px){
.katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:2px 0}
.katex{max-width:100%}
.concept,.card,.fcard,.widget,.prob-wrap .card,.shead,.hero{
max-width:100%;min-width:0;overflow-wrap:anywhere;word-break:break-word
}
.concept .def,.concept ul.pts li,.exbox,.notebox,.summary,.tips ol li{
overflow-wrap:anywhere;word-break:break-word
}
.fcard .ftex{padding:14px 8px}
.prob-wrap .meta-box,.prob-wrap .en,.prob-wrap .note,.prob-wrap .assumption,.prob-wrap .answer{
overflow-wrap:anywhere;word-break:break-word
}
.prob-wrap table{display:block;overflow-x:auto;width:100%;max-width:100%}
.prob-wrap table th,.prob-wrap table td{white-space:normal}
details.sol{border-radius:11px}
details.sol summary{padding:12px 12px;font-size:calc(12.5px * var(--fs-scale, 1))}
details.sol .sol-body{padding:14px 12px}
details.sol[open] > *:not(summary){padding-inline:12px}
.shead{padding:18px;gap:14px}
.shead .num{width:64px;height:64px;font-size:calc(28px * var(--fs-scale, 1));border-radius:18px}
.shead .grow{min-width:0}
#fpop{max-width:calc(100vw - 20px);left:10px !important;right:10px !important}
}

@media(max-width:1060px){
main#main, .page,
.card, .concept, .fcard, .widget,
.shead, .diagram-card, .hero,
.sess-card, .chap, .glos-card, .stat,
.prob-wrap, .prob-wrap .card,
details.sol, details.sol .sol-body,
details.sol .sol-body > * {
min-width: 0;
max-width: 100%;
}
.page, .page * {
overflow-wrap: anywhere;
word-break: break-word;
}

.shead{
flex-direction: column;
align-items: stretch;
text-align: center;
gap: 14px;
padding: 20px 16px;
}
.shead .num{
width: 72px; height: 72px;
font-size: calc(30px * var(--fs-scale, 1)); border-radius: 20px;
margin: 0 auto; align-self: center;
}
.shead .grow{flex: 1 1 auto; min-width: 0; width: 100%; text-align: center}
.shead h1{font-size: clamp(17px, 4.6vw, 20px); line-height: 1.6; word-break: break-word}
.shead .meta{justify-content: center; margin-top: 10px}
.shead #readBtn{width: 100%; justify-content: center; font-size: calc(13px * var(--fs-scale, 1)); padding: 10px 16px}

.sec-title{flex-wrap: wrap; gap: 8px}
.sec-title h2{font-size: calc(17px * var(--fs-scale, 1))}
.sec-title small{display: none}

.fgrid{grid-template-columns: 1fr}
.stats{grid-template-columns: repeat(auto-fit, minmax(min(140px, 100%), 1fr))}

.fcard .fhead{flex-wrap: wrap; gap: 6px}
.fcard .ftex{padding: 14px 8px}

.chip{font-size: calc(12px * var(--fs-scale, 1)); padding: 5px 12px}
.chips{gap: 6px}

.prob-wrap .card{padding: 14px 12px}
.prob-wrap .meta-box, .prob-wrap .en,
.prob-wrap .note, .prob-wrap .assumption, .prob-wrap .answer{
padding: 10px 12px; border-radius: 10px;
overflow-wrap: anywhere; word-break: break-word;
max-width: 100%;
}
.prob-wrap .en{
direction: ltr; text-align: left;
white-space: normal;
}
.prob-wrap table{display: block; overflow-x: auto; width: 100%; max-width: 100%}
.prob-wrap table th, .prob-wrap table td{white-space: normal}

details.sol summary{padding: 12px 14px; font-size: calc(12.5px * var(--fs-scale, 1))}
details.sol .sol-body{padding: 14px 12px}
details.sol[open] > *:not(summary){padding-inline: 12px}

.katex-display{max-width: 100%; overflow-x: auto; overflow-y: hidden; padding: 2px 0}
.katex{max-width: 100%}

#fpop{max-width: calc(100vw - 20px); left: 10px !important; right: 10px !important}
}

@media(max-width:420px){
.shead .num{width: 60px; height: 60px; font-size: calc(26px * var(--fs-scale, 1)); border-radius: 16px}
.hero{padding: 20px 16px; border-radius: 20px}
.hero h2{font-size: calc(22px * var(--fs-scale, 1))}
.hero p{font-size: calc(13.5px * var(--fs-scale, 1))}
.stats{grid-template-columns: repeat(2, 1fr)}
.prob-wrap .card{padding: 12px 10px}
details.sol summary{font-size: calc(12px * var(--fs-scale, 1))}
}

.wt-ic{
display:inline-grid;place-items:center;flex-shrink:0;
width:1.15rem;height:1.15rem;color:var(--color-cyan);
vertical-align:-.15em
}
.wt-ic{color:var(--color-violet);width:1.25rem;height:1.25rem;margin-inline-end:4px}
.wt-ic svg{width:100%;height:100%;display:block}

.box-ic{
display:inline-grid;place-items:center;
width:1rem;height:1rem;flex-shrink:0;
margin-inline-end:6px;vertical-align:-.15em
}
.box-ic svg{width:100%;height:100%;display:block}
.exbox,.notebox{display:flex;align-items:flex-start;gap:0}
.exbox>.box-ic{color:var(--color-green)}
.notebox>.box-ic{color:var(--color-amber)}

.btn svg{width:1rem;height:1rem;display:block;flex-shrink:0}

.navit .ck{display:grid;place-items:center;width:1rem;height:1rem}
.navit .ck svg{width:1rem;height:1rem;display:block}

.sess-card .st{display:grid;place-items:center;width:1.1rem;height:1.1rem}
.sess-card .st svg{width:1.1rem;height:1.1rem;display:block}

.glos-page {
  max-width: 1100px;
  margin-inline: auto;
}
.lib-kicker,
.shop-kicker,
.glos-kicker,
.plan-kicker,
.pg-kicker,
.fc-kicker,
.lab-kicker,
.refs-kicker,
.prob-kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: calc(12px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--accent);
  letter-spacing: .02em;
}
.lib-kicker svg,
.shop-kicker svg,
.glos-kicker svg,
.plan-kicker svg,
.pg-kicker svg,
.fc-kicker svg,
.lab-kicker svg,
.refs-kicker svg,
.prob-kicker svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.lab-hero,
.refs-hero,
.prob-hero {
  padding: 4px 2px 18px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 18px;
}
.lab-h1,
.refs-h1,
.prob-h1 {
  margin: 6px 0 4px;
  font-size: calc(26px * var(--fs-scale, 1));
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.3;
  color: var(--text-primary);
}
.lab-sub,
.refs-sub,
.prob-sub {
  margin: 0;
  font-size: calc(13.5px * var(--fs-scale, 1));
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 62ch;
}

.glos-hero {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 2px 18px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 18px;
}
.glos-hero-tx { flex: 1; min-width: 240px; }
.glos-h1 {
  margin: 8px 0 6px;
  font-size: calc(24px * var(--fs-scale, 1));
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--text-primary);
  line-height: 1.3;
}
.glos-sub {
  margin: 0;
  color: var(--text-secondary);
  font-size: calc(13.5px * var(--fs-scale, 1));
  line-height: 1.85;
  max-width: 52ch;
}
.glos-search {
  position: relative;
  min-width: 220px;
  flex: 0 1 320px;
}
.glos-search svg {
  position: absolute;
  inset-inline-start: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--text-tertiary);
  pointer-events: none;
}
.glos-search input {
  width: 100%;
  padding-block: .65rem;
  padding-inline-start: 2.4rem;
  padding-inline-end: .9rem;
  border-radius: 11px;
  border: 1px solid var(--border-subtle);
  background: var(--surface-raised);
  color: var(--text-primary);
  font-family: inherit;
  font-size: calc(13px * var(--fs-scale, 1));
  outline: none;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.glos-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
.glos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}
.glos-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px 18px;
  border-radius: 14px;
  border: 1px solid var(--border-subtle);
  background: var(--surface-raised);
  position: relative;
  transition:
    border-color .2s var(--ease),
    transform .2s var(--ease),
    box-shadow .2s var(--ease);
}
.glos-card::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--accent);
  opacity: .5;
  transition: opacity .2s var(--ease);
}
.glos-card:hover {
  border-color: color-mix(in srgb, var(--accent) 32%, var(--border-subtle));
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -20px color-mix(in srgb, var(--accent) 40%, transparent);
}
.glos-card:hover::before { opacity: 1; }
.glos-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-inline-start: 6px;
}
.glos-term {
  flex: 1;
  min-width: 0;
  margin: 0;
  font-size: calc(14.5px * var(--fs-scale, 1));
  font-weight: 800;
  line-height: 1.5;
  color: var(--text-primary);
  letter-spacing: -.01em;
}
.glos-sess {
  flex-shrink: 0;
  font-size: calc(10.5px * var(--fs-scale, 1));
  font-weight: 800;
  letter-spacing: .03em;
  padding: 3px 9px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border-subtle));
  color: var(--accent);
  white-space: nowrap;
}
.glos-def {
  padding-inline-start: 6px;
  font-size: calc(13px * var(--fs-scale, 1));
  line-height: 1.95;
  color: var(--text-secondary);
}
.glos-def .katex { font-size: 1em; }
.glos-empty {
  grid-column: 1 / -1;
  padding: 40px 20px;
  text-align: center;
  border-radius: 14px;
  border: 1px dashed var(--border-subtle);
  background: color-mix(in srgb, var(--surface-recess) 55%, transparent);
  color: var(--text-tertiary);
  font-size: calc(13.5px * var(--fs-scale, 1));
}
@media (max-width: 640px) {
  .glos-hero { padding: 4px 0 18px; gap: 12px; }
  .glos-grid { grid-template-columns: 1fr; }
}

.icon-btn{width:42px;height:42px;border-radius:11px;border:1px solid var(--border-subtle);background:var(--surface-raised);color:var(--text-primary);font-size:calc(17px * var(--fs-scale, 1));display:grid;place-items:center;flex-shrink:0;transition:transform .25s var(--ease),border-color .25s,background .25s}
.icon-btn:hover{border-color:var(--focus-ring)}
.icon-btn:active{transform:scale(.94)}
.icon-btn > svg,
.icon-btn svg{
width:1.15rem;
height:1.15rem;
max-width:1.15rem;
max-height:1.15rem;
display:block;
pointer-events:none;
flex-shrink:0
}

.btn,.chip,.seg button,.icon-btn,.rchip,.fchip,.navit{
transition:transform var(--motion-fast) var(--ease),box-shadow var(--motion-fast) var(--ease),background var(--motion-fast) var(--ease),border-color var(--motion-fast) var(--ease),color var(--motion-fast) var(--ease);
}
.btn:hover,.chip:hover,.seg button:hover,.icon-btn:hover{box-shadow:0 8px 20px rgba(99,102,241,.22)}
.btn:active,.chip:active,.seg button:active,.icon-btn:active{transform:scale(.96)}

.btn{position:relative;overflow:hidden}
.rip{position:absolute;border-radius:50%;pointer-events:none;
background:currentColor;opacity:.28;transform:scale(0);
animation:rip .6s var(--ease) forwards}
@keyframes rip{to{transform:scale(2.6);opacity:0}}

button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--color-violet);outline-offset:2px}

.bump{animation:pillBump .55s var(--ease-bounce)}

.hend{display:flex;align-items:center;gap:10px;margin-inline-start:auto;flex-shrink:0}
.ver-tag{font-weight:800;color:var(--color-cyan);letter-spacing:.5px}
@media(max-width:1060px){
.sub-long{display:none}
}

@media (hover: none) {
button,
.btn,
.chip,
.navit,
.icon-btn,
.ctx-item,
.rchip,
.fchip,
a {
touch-action: manipulation;
}
.btn:hover,
.chip:hover,
.navit:hover,
.icon-btn:hover,
.rchip:hover,
.fchip:hover,
.seg button:hover,
.set-seg button:hover,
.set-seg.cards button:hover,
.set-seg.swatches button:hover,
.prog-pill:hover,
.sess-card:hover,
.chap:hover,
.glos-card:hover,
.concept:hover,
.fcard:hover,
.card:hover,
.widget:hover {
transform: none !important;
box-shadow: none !important;
}
.btn:hover        { border-color: var(--border-strong); background: var(--surface-nested); color: var(--text-primary); }
.btn.g:hover      { background: var(--accent); border-color: transparent; }
.btn.ghost:hover  { border-color: var(--border-subtle); background: transparent; color: var(--text-secondary); }
.btn.done:hover   { background: rgba(52,211,153,.15); border-color: rgba(52,211,153,.5); color: var(--color-green); }
.icon-btn:hover   { border-color: var(--border-subtle); background: var(--surface-raised); color: var(--text-primary); }
.chip:hover       { border-color: var(--border-subtle); background: var(--surface-nested); color: var(--text-secondary); }
.chip.hl:hover    { background: linear-gradient(90deg,rgba(139,92,246,.2),rgba(34,211,238,.12)); border-color: rgba(139,92,246,.4); color: var(--text-primary); }
.navit:hover      { background: transparent; color: var(--text-secondary); border-color: transparent; }
.navit.on:hover   { background: linear-gradient(90deg,rgba(139,92,246,.16),rgba(34,211,238,.08)); color: var(--text-primary); border-color: rgba(139,92,246,.35); }
.rchip:hover      { border-color: var(--border-subtle); color: var(--text-secondary); background: var(--surface-nested); }
.fchip:hover      { border-color: rgba(34,211,238,.35); color: var(--color-cyan); background: rgba(34,211,238,.08); }
.seg button:hover { border-color: var(--border-subtle); background: var(--surface-nested); color: var(--text-secondary); }
.seg button.on:hover {
background: linear-gradient(135deg,rgba(139,92,246,.3),rgba(34,211,238,.2));
color: var(--text-primary);
border-color: rgba(139,92,246,.55);
}
}

::selection{background:var(--color-violet);color:#fff}

.ctx-menu{
position:fixed;z-index:320;
min-width:220px;
max-width:280px;
background:var(--surface-raised);
border:1px solid var(--border-strong);
border-radius:13px;
box-shadow:
  0 1px 0 rgba(255,255,255,.04) inset,
  0 12px 32px rgba(0,0,0,.28),
  0 4px 12px rgba(0,0,0,.18);
padding:5px;
display:none;
}

.ctx-submenu{position:relative}
.ctx-submenu-panel{
position:absolute;
inset-inline-start:calc(100% + 4px);
top:-5px;
min-width:180px;
background:var(--surface-raised);
border:1px solid var(--border-strong);
border-radius:12px;
box-shadow:0 12px 32px rgba(0,0,0,.28);
padding:5px;
opacity:0;visibility:hidden;pointer-events:none;
transition:opacity .14s var(--ease-ios),visibility 0s linear .14s;
}
.ctx-submenu.open > .ctx-submenu-panel{
opacity:1;visibility:visible;pointer-events:auto;
transition:opacity .14s var(--ease-ios),visibility 0s;
}

.ctx-item .cx{
display:grid;place-items:center;
flex:0 0 12px;width:12px;height:12px;
color:var(--text-tertiary);
opacity:.7;
margin-inline-start:auto;
}
.ctx-submenu.open > .ctx-item .cx{opacity:1;color:var(--accent)}
.ctx-menu.open{
animation:ctxIn .18s var(--ease) both;
transform-origin:var(--ox,0) var(--oy,0);
}
@keyframes ctxIn{
from{opacity:0;transform:scale(.94)}
to{opacity:1;transform:scale(1)}
}
.ctx-item{
position:relative;
display:flex;align-items:center;gap:10px;
width:100%;text-align:right;
background:transparent;
border:none;border-radius:8px;
padding:9px 10px;
color:var(--text-secondary);
font-family:inherit;
font-size:calc(13px * var(--fs-scale, 1));font-weight:500;
cursor:pointer;
transition:background .15s var(--ease),color .15s var(--ease);
}
.ctx-item::after{
content:"";position:absolute;
inset-inline-end:0;top:50%;
transform:translateY(-50%);
width:2px;height:0;
border-radius:2px;
background:linear-gradient(180deg,var(--accent),var(--color-cyan));
transition:height .22s var(--ease);
}
.ctx-item .ci{
display:grid;place-items:center;
flex:0 0 16px;width:16px;height:16px;
color:currentColor;
opacity:.7;
transition:opacity .15s var(--ease);
}
.ctx-item .cl{
flex:1;min-width:0;
overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.ctx-item:hover,
.ctx-item:focus-visible{
background:var(--surface-nested);
color:var(--text-primary);
outline:none;
}
.ctx-item:hover::after,
.ctx-item:focus-visible::after{height:55%}
.ctx-item:hover .ci,
.ctx-item:focus-visible .ci{opacity:1}
.ctx-item:active{
background:color-mix(in srgb,var(--accent) 12%,var(--surface-nested));
}

@media(prefers-reduced-motion:reduce){.ctx-menu{animation:none}}

.modal-back{position:fixed;inset:0;z-index:110;background:rgba(3,6,16,.62);
backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);
display:none;place-items:safe center;padding:24px 16px;overflow-y:auto}
.modal-back[hidden]{display:none !important}
.modal-back.open{display:grid;touch-action:pan-y;overscroll-behavior:contain}
.modal-back .modal{background:linear-gradient(160deg,var(--surface-raised),var(--surface-recess));
border:1px solid var(--border-strong);border-radius:16px;box-shadow:var(--shadow-base);
width:100%;max-width:420px;padding:1.4rem;
animation:rise var(--motion-fast) var(--ease) both}
.modal-back .modal .inp{width:100%;padding:.6rem .8rem;border-radius:10px;
border:1px solid var(--border-subtle);background:var(--surface-recess);
font-size:var(--font-size-sm);outline:none;
transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.modal-back .modal .inp:focus{border-color:var(--focus-ring);
box-shadow:0 0 0 4px rgba(124,92,219,.14)}

.dialog-modal{max-width:400px;padding:0;overflow:hidden;border-radius:16px}
.dialog-accent{
height:2px;
background:var(--accent);
opacity:.85;
mask-image:linear-gradient(90deg,transparent,#000 20%,#000 80%,transparent);
-webkit-mask-image:linear-gradient(90deg,transparent,#000 20%,#000 80%,transparent);
transition:opacity .22s var(--ease);
}
.dialog-modal.is-danger .dialog-accent{
background:var(--color-rose);
}
.dialog-modal.is-danger .dialog-accent{
background:var(--color-rose);
}
.dialog-body{padding:1.35rem 1.4rem 1.2rem}
.dialog-head{display:flex;align-items:center;gap:.55rem;margin-bottom:.6rem}
.dialog-ic{width:1.15rem;height:1.15rem;color:var(--accent);flex-shrink:0;
display:grid;place-items:center}
.dialog-ic svg{width:100%;height:100%;display:block}
.dialog-modal.is-danger .dialog-ic{color:var(--color-rose)}
.dialog-modal.is-help .dialog-ic{color:var(--color-blue)}
.dialog-modal.is-down .dialog-ic{color:var(--color-green)}
.dialog-title{font-size:var(--font-size-xl);font-weight:800;line-height:1.35;
color:var(--text-primary);min-width:0}
.dialog-msg{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.85;
margin-bottom:1.2rem;overflow-wrap:anywhere;text-wrap:pretty}
.dialog-msg b{color:var(--text-primary);font-weight:700}
.dialog-msg:empty{display:none}
.dialog-modal #dialogFieldWrap{margin-bottom:1.2rem}
.dialog-modal #dialogFieldWrap label{display:block;font-size:var(--font-size-xs);
color:var(--text-secondary);margin-bottom:5px;font-weight:600}
.modal .foot.dialog-foot{display:grid;grid-auto-flow:column;
grid-auto-columns:minmax(0,1fr);gap:.6rem;margin-top:0;flex-wrap:nowrap}
.modal .foot.dialog-foot .btn{width:100%;padding:.7rem .9rem;
font-size:var(--font-size-sm);min-width:0;white-space:nowrap;overflow:hidden;
text-overflow:ellipsis;justify-content:center}
.dialog-foot #dialogCancel{background:transparent;border-color:rgba(255,255,255,.12);
color:var(--text-secondary);font-weight:700}
.dialog-foot #dialogCancel:hover{color:var(--text-primary);border-color:rgba(255,255,255,.2);
background:rgba(255,255,255,.04);box-shadow:none}
.dialog-foot #dialogOk{background:var(--accent);color:var(--text-on-accent);
border:1px solid transparent;font-weight:800;box-shadow:none}
.dialog-foot #dialogOk:hover{background:color-mix(in srgb,var(--accent) 85%,#fff);
box-shadow:none}
.dialog-modal.is-danger .dialog-foot #dialogOk{
background:color-mix(in srgb,var(--color-rose) 8%,transparent);
border:1px solid color-mix(in srgb,var(--color-rose) 55%,transparent);
color:var(--color-rose);font-weight:800}
.dialog-modal.is-danger .dialog-foot #dialogOk:hover{
background:color-mix(in srgb,var(--color-rose) 16%,transparent);
border-color:var(--color-rose);box-shadow:none}
@media(max-width:480px){
.dialog-modal{max-width:none;width:100%;border-radius:14px}
.dialog-body{padding:.95rem 1rem .85rem}
.dialog-accent{height:2.5px}
.dialog-title{font-size:var(--font-size-md);line-height:1.3}
.dialog-msg{font-size:var(--font-size-xs);line-height:1.75;margin-bottom:.9rem}
.modal .foot.dialog-foot{gap:.45rem}
.modal .foot.dialog-foot .btn{padding:.6rem .6rem;font-size:var(--font-size-xs);
border-radius:10px}
}

.toast-undo{position:fixed;bottom:calc(64px + env(safe-area-inset-bottom,0px));left:50%;
transform:translateX(-50%) translateY(30px) scale(.9);
background:var(--surface-raised);border:1px solid var(--border-strong);border-radius:14px;
padding:.35rem .35rem .35rem .85rem;font-size:var(--font-size-sm);font-weight:600;
opacity:0;pointer-events:none;
transition:opacity .4s var(--ease-ios),transform .5s var(--ease-spring);
z-index:305;box-shadow:var(--shadow-base);
display:flex;align-items:center;gap:.55rem;
max-width:calc(100vw - 24px);overflow:hidden;direction:rtl}
.toast-undo.show{opacity:1;transform:translateX(-50%) translateY(0) scale(1);
pointer-events:auto}
.toast-undo[hidden]{display:none !important}
.toast-undo .undo-txt{flex:1 1 auto;min-width:0;overflow:hidden;
text-overflow:ellipsis;white-space:nowrap;line-height:1.4}
.toast-undo .undo-btn{display:inline-flex;align-items:center;
justify-content:center;width:2.1rem;height:2.1rem;padding:0;margin:0;
border:none;border-radius:10px;background:var(--accent);color:var(--text-on-accent);
font-size:0;line-height:0;cursor:pointer;flex:0 0 auto;
transition:transform .18s var(--ease),background .18s var(--ease)}
.toast-undo .undo-btn svg{width:1.1rem;height:1.1rem;display:block}
.toast-undo .undo-btn:hover{background:color-mix(in srgb,var(--accent) 88%,#fff);
transform:translateY(-1px);box-shadow:0 6px 18px color-mix(in srgb,var(--accent) 30%,transparent)}
.toast-undo .undo-btn:active{transform:scale(.92)}
.toast-undo .undo-progress{position:absolute;bottom:0;right:0;left:0;height:3px;
background:linear-gradient(to left,
color-mix(in srgb,var(--accent) 40%,transparent),var(--accent));
transform-origin:right center;transform:scaleX(1);pointer-events:none;
border-radius:0 0 14px 14px}
.toast-undo.show .undo-progress{
animation:undoCountdown var(--undo-dur,5000ms) linear forwards}
.toast-undo.show:hover .undo-progress{animation-play-state:paused}
@keyframes undoCountdown{from{transform:scaleX(1)}to{transform:scaleX(0)}}

.gtip{position:fixed;z-index:600;pointer-events:none;
padding:3px 9px;border-radius:6px;
background:var(--surface-tooltip);color:var(--text-on-tooltip);
font-family:var(--font);
font-size:calc(10.5px * var(--fs-scale, 1));font-weight:600;white-space:nowrap;
box-shadow:0 2px 10px rgba(0,0,0,.22);
opacity:0;
transform:translateX(-50%) translateY(3px);
transition:opacity .12s linear,transform .14s var(--ease-ios)}
.gtip.show{opacity:1;transform:translateX(-50%) translateY(0)}
.gtip.below:not(.show){transform:translateX(-50%) translateY(-3px)}
.gtip[hidden]{display:none !important}

.btn.ghost{background:transparent;border-color:rgba(255,255,255,.12);
color:var(--text-secondary);font-weight:700}
.btn.ghost:hover{color:var(--text-primary);border-color:rgba(255,255,255,.2);
background:rgba(255,255,255,.04);box-shadow:none}

.guide-steps{padding:0 0 0 1.2rem;margin:8px 0 12px}
.guide-steps li{margin-bottom:6px}

.docs-page{max-width:1100px}
.docs-top{
display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
gap:16px;margin-bottom:28px;padding-bottom:22px;border-bottom:1px solid var(--border-subtle);
}
.docs-kicker{
font-size:calc(11px * var(--fs-scale, 1));font-weight:800;color:var(--color-violet);letter-spacing:.06em;
text-transform:uppercase;margin-bottom:6px;
}
.docs-top h1{font-size:clamp(1.6rem,3vw,2rem);font-weight:850;letter-spacing:-.02em;margin:0}
.docs-sub{color:var(--text-secondary);font-size:calc(14.5px * var(--fs-scale, 1));line-height:1.7;margin-top:8px;max-width:36rem}
.docs-badges{display:flex;flex-wrap:wrap;gap:8px}
.docs-layout{
display:grid;grid-template-columns:220px minmax(0,1fr);gap:28px;align-items:start;
}
@media(max-width:900px){
.docs-layout{grid-template-columns:1fr}
.docs-side{
display:flex;flex-wrap:nowrap;gap:6px;overflow-x:auto;padding-bottom:8px;
position:sticky;top:72px;z-index:15;
background:color-mix(in srgb,var(--surface-canvas) 92%,transparent);
backdrop-filter:blur(10px);
}
}
.docs-side{
position:sticky;top:84px;display:flex;flex-direction:column;gap:4px;
padding:8px;border-radius:16px;border:1px solid var(--border-subtle);background:var(--surface-raised);
}
.docs-nav-item{
display:flex;align-items:center;gap:10px;width:100%;text-align:start;
border:1px solid transparent;background:transparent;color:var(--text-secondary);
font-family:inherit;font-size:calc(13px * var(--fs-scale, 1));font-weight:700;padding:10px 12px;
border-radius:11px;cursor:pointer;transition:.18s var(--ease);
}
.docs-nav-item:hover{background:var(--surface-nested);color:var(--text-primary)}
.docs-nav-item.on{
background:linear-gradient(90deg,rgba(139,92,246,.16),rgba(34,211,238,.07));
border-color:rgba(139,92,246,.35);color:var(--text-primary);
}
.docs-nav-item .dn-i{
width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
font-size:calc(11px * var(--fs-scale, 1));font-weight:800;background:var(--surface-nested);color:var(--color-violet);flex-shrink:0;
}
.docs-nav-item.on .dn-i{background:var(--accent);color:#0b0f1e}
.docs-main{min-width:0}
.docs-panel{display:none;animation:viewIn .28s var(--ease-ios)}
.docs-panel.on{display:block}
.docs-panel-head h2{font-size:calc(1.35rem * var(--fs-scale, 1));font-weight:850;margin:0 0 16px;letter-spacing:-.02em}
.docs-code{
display:block;direction:ltr;text-align:left;font-family:var(--font-mono);
font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.7;padding:14px 16px;margin:14px 0;
background:var(--surface-recess);border:1px solid var(--border-subtle);border-radius:12px;
overflow-x:auto;color:var(--color-cyan);white-space:pre;
}

@media (max-width:1060px){
.docs-page{max-width:100%;padding:0}
.docs-top{padding-bottom:16px;margin-bottom:16px}
.docs-code{font-size:calc(11.5px * var(--fs-scale, 1));padding:12px}
.docs-side{
flex-direction:row;
width:100%;
max-width:100%;
box-sizing:border-box;
}
.docs-nav-item{flex-shrink:0;width:auto}
.docs-nav-item .dn-t{white-space:nowrap}
.set-shell{min-width:0}
.card,.page,.shead{max-width:100%;min-width:0}
}
[data-tip]::before,[data-tip]::after{content:none !important}
.set-seg.swatches button{background-clip:padding-box}
.set-seg.swatches button:hover{
transform:scale(1.05);
box-shadow:0 6px 16px rgba(0,0,0,.28);
}
.set-seg.swatches button.on,
.set-seg.swatches button.on:hover{
box-shadow:0 0 0 2px var(--surface-canvas),0 0 0 4px var(--color-violet);
}

.exp-dev-pre{
  max-height:280px;
  overflow:auto;
  white-space:pre;
  font-size:calc(11.5px * var(--fs-scale, 1));
  line-height:1.75;
  padding:14px 16px;
  border-radius:12px;
  background:var(--surface-recess);
  border:1px solid var(--border-subtle);
  color:var(--color-cyan);
  direction:ltr;
  text-align:left;
}
.exp-dev-confirm{
  padding:20px 22px;
  border-radius:16px;
  background:color-mix(in srgb,var(--surface-raised) 92%,transparent);
  border:1px solid var(--border-strong);
  margin-bottom:16px;
}
.exp-dev-warn{
  margin-top:12px;
  padding:10px 14px;
  font-size:calc(12.5px * var(--fs-scale, 1));
  line-height:1.7;
  border-radius:10px;
  background:color-mix(in srgb,var(--color-amber) 10%,transparent);
  border:1px solid color-mix(in srgb,var(--color-amber) 35%,var(--border-subtle));
  color:var(--color-amber);
}
#expDevConfirmBtn:disabled,
#expDevConfirmBtn[aria-disabled="true"]{
  opacity:.5;
  cursor:not-allowed;
  filter:saturate(.6);
}
#expDevArm:disabled{
  opacity:.7;
  cursor:default;
}

.docs-page{max-width:1180px}

.docs-top{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:20px;margin-bottom:28px;padding-bottom:22px;
  border-bottom:1px solid var(--border-subtle);
}
.docs-top-text{flex:1;min-width:0}
.docs-kicker{
  font-size:calc(11px * var(--fs-scale, 1));font-weight:800;color:var(--accent);
  letter-spacing:.06em;text-transform:uppercase;margin-bottom:8px;
}
.docs-top h1{
  font-size:clamp(1.5rem,2.6vw,1.9rem);
  font-weight:850;letter-spacing:-.02em;margin:0 0 8px;
}
.docs-sub{
  color:var(--text-secondary);font-size:calc(14.5px * var(--fs-scale, 1));line-height:1.7;
  max-width:44rem;margin:0;
}
.docs-badges{display:flex;flex-wrap:wrap;gap:8px;align-items:center}

.docs-layout{
  display:grid;grid-template-columns:200px minmax(0,1fr);
  gap:32px;align-items:start;
}
.docs-side{
  position:sticky;top:84px;
  display:flex;flex-direction:column;gap:2px;
  padding:8px;
  border:1px solid var(--border-subtle);
  border-radius:14px;
  background:var(--surface-raised);
}
.docs-nav-item{
  display:flex;align-items:center;gap:10px;
  width:100%;text-align:start;
  padding:9px 12px;
  border:1px solid transparent;border-radius:9px;
  background:transparent;color:var(--text-secondary);
  font-family:inherit;font-size:calc(13px * var(--fs-scale, 1));font-weight:700;
  cursor:pointer;
  transition:background .18s var(--ease-ios),color .18s var(--ease-ios),border-color .18s var(--ease-ios);
}
.docs-nav-item:hover{background:var(--surface-nested);color:var(--text-primary)}
.docs-nav-item.on{
  background:color-mix(in srgb,var(--accent) 10%,var(--surface-raised));
  border-color:color-mix(in srgb,var(--accent) 32%,var(--border-subtle));
  color:var(--text-primary);
}
.docs-nav-item .dn-i{
  display:grid;place-items:center;
  width:24px;height:24px;flex-shrink:0;
  border-radius:7px;
  background:color-mix(in srgb,var(--accent) 12%,var(--surface-nested));
  border:1px solid color-mix(in srgb,var(--accent) 26%,var(--border-subtle));
  color:var(--accent);
  transition:background .18s var(--ease-ios),
             border-color .18s var(--ease-ios),
             color .18s var(--ease-ios);
}
.docs-nav-item .dn-i svg{width:13px;height:13px;display:block}
.docs-nav-item.on .dn-i{
  background:var(--accent);
  border-color:var(--accent);
  color:var(--text-on-accent);
}
.docs-nav-item .dn-t{
  flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}

.docs-main{min-width:0}
.docs-panel{display:none;animation:viewIn .22s var(--ease-ios)}
.docs-panel.on{display:block}
.docs-panel-head h2{
  font-size:calc(1.25rem * var(--fs-scale, 1));font-weight:850;letter-spacing:-.02em;
  margin:0 0 12px;color:var(--text-primary);
}
.docs-lead{
  color:var(--text-secondary);font-size:calc(14px * var(--fs-scale, 1));line-height:1.9;
  margin:0 0 20px;max-width:56ch;
}
.guide-h3{
  font-size:calc(13.5px * var(--fs-scale, 1));font-weight:800;color:var(--text-primary);
  margin:26px 0 10px;letter-spacing:.01em;
  padding-inline-start:10px;
  border-inline-start:3px solid var(--accent);
  line-height:1.4;
}

.guide-files{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}
.guide-file{
  display:flex;align-items:center;gap:12px;
  padding:12px 14px;
  border:1px solid var(--border-subtle);border-radius:10px;
  background:var(--surface-raised);
  font-size:calc(13.5px * var(--fs-scale, 1));
}
.guide-file code{
  font-family:var(--font-mono);font-size:calc(13px * var(--fs-scale, 1));
  color:var(--color-cyan);font-weight:700;
}
.gf-tag{
  font-size:calc(10px * var(--fs-scale, 1));font-weight:800;letter-spacing:.04em;
  padding:2px 8px;border-radius:5px;
  background:color-mix(in srgb,var(--color-rose) 12%,transparent);
  border:1px solid color-mix(in srgb,var(--color-rose) 35%,transparent);
  color:var(--color-rose);
  flex-shrink:0;
}
.gf-tag.opt{
  background:color-mix(in srgb,var(--color-cyan) 10%,transparent);
  border-color:color-mix(in srgb,var(--color-cyan) 30%,transparent);
  color:var(--color-cyan);
}
.gf-desc{color:var(--text-secondary);font-size:calc(12.5px * var(--fs-scale, 1));margin-inline-start:auto;text-align:end}

.guide-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--border-subtle);border:1px solid var(--border-subtle);
  border-radius:12px;overflow:hidden;margin-bottom:10px;
}
.gs{
  display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:14px 8px;background:var(--surface-raised);
}
.gs b{
  font-size:calc(20px * var(--fs-scale, 1));font-weight:800;color:var(--text-primary);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
.gs span{font-size:calc(11px * var(--fs-scale, 1));color:var(--text-tertiary);font-weight:700}

.guide-fields{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:8px;margin-bottom:8px;
}
.gf{
  display:flex;flex-direction:column;gap:2px;
  padding:10px 12px;border:1px solid var(--border-subtle);border-radius:9px;
  background:var(--surface-raised);
}
.gf code{
  font-family:var(--font-mono);font-size:calc(12.5px * var(--fs-scale, 1));
  color:var(--color-cyan);font-weight:700;
}
.gf span{font-size:calc(11.5px * var(--fs-scale, 1));color:var(--text-primary);opacity:.85;line-height:1.6}

.docs-code{
  display:block;direction:ltr;text-align:left;
  font-family:var(--font-mono);
  font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.75;
  padding:14px 16px;margin:0 0 12px;
  background:var(--surface-recess);
  border:1px solid var(--border-subtle);border-radius:12px;
  overflow-x:auto;color:var(--color-cyan);
  white-space:pre;
  scrollbar-width:thin;
}
.docs-code::-webkit-scrollbar{height:5px}
.docs-code::-webkit-scrollbar-thumb{
  background:color-mix(in srgb,var(--text-primary) 22%,transparent);
  border-radius:99px;
}
.docs-code::-webkit-scrollbar-track{background:transparent}

.docs-list,.guide-steps{
  margin:0 0 12px;padding-inline-start:20px;
  color:var(--text-secondary);font-size:calc(13.5px * var(--fs-scale, 1));line-height:1.9;
}
.docs-list li,.guide-steps li{margin-bottom:6px}
.docs-list code,.guide-steps code{
  font-family:var(--font-mono);font-size:calc(12.5px * var(--fs-scale, 1));color:var(--color-cyan);
  padding:1px 6px;border-radius:5px;
  background:var(--surface-nested);
}

.docs-note{
  margin:16px 0;padding:14px 16px;
  border:1px solid color-mix(in srgb,var(--color-cyan) 30%,var(--border-subtle));
  border-radius:11px;
  background:color-mix(in srgb,var(--color-cyan) 7%,var(--surface-raised));
  color:var(--text-primary);font-size:calc(13.5px * var(--fs-scale, 1));line-height:1.85;
}
.docs-note b{color:var(--color-cyan)}
.docs-note code{
  font-family:var(--font-mono);font-size:calc(12.5px * var(--fs-scale, 1));
  padding:1px 6px;border-radius:5px;background:var(--surface-nested);
}
.docs-hint{
  margin:0 0 14px;
  color:var(--text-secondary);font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.75;
}
.docs-hint code{
  font-family:var(--font-mono);font-size:calc(12px * var(--fs-scale, 1));
  padding:1px 5px;border-radius:4px;background:var(--surface-nested);
  color:var(--color-cyan);
}

.health-stats{
  display:grid;grid-template-columns:repeat(2,1fr);gap:10px;
  margin-bottom:16px;
}
.hs-item{
  padding:16px 18px;border-radius:12px;
  display:flex;flex-direction:column;gap:4px;
  border:1px solid var(--border-subtle);
}
.hs-item.ok{border-color:color-mix(in srgb,var(--color-green) 30%,var(--border-subtle));background:color-mix(in srgb,var(--color-green) 6%,var(--surface-raised))}
.hs-item.warn{border-color:color-mix(in srgb,var(--color-amber) 30%,var(--border-subtle));background:color-mix(in srgb,var(--color-amber) 6%,var(--surface-raised))}
.hs-item.danger{border-color:color-mix(in srgb,var(--color-rose) 35%,var(--border-subtle));background:color-mix(in srgb,var(--color-rose) 6%,var(--surface-raised))}
.hs-item b{
  font-size:calc(26px * var(--fs-scale, 1));font-weight:900;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;line-height:1;
}
.hs-item.ok b{color:var(--color-green)}
.hs-item.warn b{color:var(--color-amber)}
.hs-item.danger b{color:var(--color-rose)}
.hs-item span{font-size:calc(12px * var(--fs-scale, 1));color:var(--text-secondary);font-weight:700}

.issues-list{list-style:none;padding:0;margin:0 0 20px;display:flex;flex-direction:column;gap:6px}
.issues-item{
  display:flex;align-items:flex-start;gap:10px;
  padding:10px 12px;
  border-radius:9px;
  border:1px solid var(--border-subtle);
  background:var(--surface-raised);
  font-size:calc(13px * var(--fs-scale, 1));line-height:1.6;
}
.issues-item.error{
  border-color:color-mix(in srgb,var(--color-rose) 30%,var(--border-subtle));
  background:color-mix(in srgb,var(--color-rose) 5%,var(--surface-raised));
}
.issues-item.warn{
  border-color:color-mix(in srgb,var(--color-amber) 26%,var(--border-subtle));
  background:color-mix(in srgb,var(--color-amber) 4%,var(--surface-raised));
}
.ii-badge{
  flex-shrink:0;
  font-size:calc(10px * var(--fs-scale, 1));font-weight:800;letter-spacing:.04em;
  padding:3px 8px;border-radius:5px;
}
.issues-item.error .ii-badge{background:color-mix(in srgb,var(--color-rose) 15%,transparent);color:var(--color-rose);border:1px solid color-mix(in srgb,var(--color-rose) 40%,transparent)}
.issues-item.warn .ii-badge{background:color-mix(in srgb,var(--color-amber) 15%,transparent);color:var(--color-amber);border:1px solid color-mix(in srgb,var(--color-amber) 40%,transparent)}
.ii-where{
  flex-shrink:0;
  font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1));
  color:var(--text-primary);
}
.ii-msg{flex:1;min-width:0;color:var(--text-secondary)}

.issues-empty{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:32px 20px;text-align:center;
  border:1px dashed color-mix(in srgb,var(--color-green) 35%,var(--border-subtle));
  border-radius:12px;
  background:color-mix(in srgb,var(--color-green) 4%,var(--surface-raised));
  margin-bottom:20px;
}
.ie-ic{
  display:grid;place-items:center;
  width:44px;height:44px;border-radius:12px;
  background:color-mix(in srgb,var(--color-green) 14%,transparent);
  color:var(--color-green);
  margin-bottom:4px;
}
.ie-ic svg{width:22px;height:22px}
.issues-empty b{font-size:calc(15px * var(--fs-scale, 1));font-weight:800;color:var(--text-primary)}
.issues-empty span{font-size:calc(12.5px * var(--fs-scale, 1));color:var(--text-secondary);line-height:1.7}

.depth-targets{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--border-subtle);border:1px solid var(--border-subtle);
  border-radius:12px;overflow:hidden;margin-bottom:20px;
}
.dt{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:14px 8px;background:var(--surface-raised);
}
.dt b{
  font-size:calc(18px * var(--fs-scale, 1));font-weight:800;color:var(--accent);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
.dt span{font-size:calc(10.5px * var(--fs-scale, 1));color:var(--text-tertiary);text-align:center;font-weight:700}

.depth-list{list-style:none;padding:0;margin:0 0 20px;display:flex;flex-direction:column;gap:8px}
.depth-item{
  padding:12px 14px;
  border:1px solid var(--border-subtle);border-radius:11px;
  background:var(--surface-raised);
}
.di-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.di-num{
  display:grid;place-items:center;
  min-width:24px;height:22px;padding:0 7px;
  background:var(--surface-nested);border:1px solid var(--border-subtle);border-radius:6px;
  font-size:calc(11.5px * var(--fs-scale, 1));font-weight:800;
  font-variant-numeric:tabular-nums;
  color:var(--text-secondary);
}
.di-title{flex:1;min-width:0;font-size:calc(13.5px * var(--fs-scale, 1));font-weight:700;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.di-tag{
  font-size:calc(10px * var(--fs-scale, 1));font-weight:800;letter-spacing:.04em;
  padding:2px 7px;border-radius:5px;
  background:color-mix(in srgb,var(--color-cyan) 12%,transparent);
  border:1px solid color-mix(in srgb,var(--color-cyan) 32%,transparent);
  color:var(--color-cyan);
}
.di-body{display:flex;align-items:center;gap:12px}
.di-meta{flex:1;min-width:0;font-size:calc(12px * var(--fs-scale, 1));color:var(--text-tertiary);font-variant-numeric:tabular-nums}
.di-bar{
  flex:0 0 160px;height:5px;border-radius:99px;
  background:color-mix(in srgb,var(--border-strong) 55%,transparent);
  overflow:hidden;
}
.di-bar i{display:block;height:100%;border-radius:99px;transition:width .5s var(--ease-ios)}
.di-bar i.good{background:linear-gradient(90deg,var(--color-green),var(--color-cyan))}
.di-bar i.mid{background:linear-gradient(90deg,var(--color-amber),var(--color-gold))}
.di-bar i.low{background:linear-gradient(90deg,var(--color-rose),var(--color-amber))}
.di-pct{
  flex-shrink:0;
  font-size:calc(12.5px * var(--fs-scale, 1));font-weight:800;color:var(--text-primary);
  font-variant-numeric:tabular-nums;
  min-width:36px;text-align:end;
}

@media (max-width:900px){
  .docs-layout{grid-template-columns:1fr;gap:20px}
  .docs-side{
    position:static;
    flex-direction:row;flex-wrap:nowrap;
    overflow-x:auto;
    padding:6px;
    scrollbar-width:none;
  }
  .docs-side::-webkit-scrollbar{display:none}
  .docs-nav-item{flex-shrink:0;width:auto}
  .docs-nav-item .dn-t{white-space:nowrap}
  .guide-stats,.depth-targets{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .docs-top{padding-bottom:16px;margin-bottom:20px}
  .docs-top h1{font-size:calc(1.35rem * var(--fs-scale, 1))}
  .docs-sub{font-size:calc(13.5px * var(--fs-scale, 1))}
  .guide-file{flex-wrap:wrap;gap:8px}
  .gf-desc{margin-inline-start:0;text-align:start;width:100%}
  .health-stats{grid-template-columns:1fr;gap:8px}
  .issues-item{flex-wrap:wrap}
  .ii-msg{width:100%}
  .di-bar{flex-basis:100px}
  .docs-code{font-size:calc(11.5px * var(--fs-scale, 1));padding:12px 12px}
}

.about-hero {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 4px 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}
.about-hero-logo {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--ac), var(--ac-2));
  color: var(--ac-ink);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .22),
    0 8px 22px color-mix(in srgb, var(--ac) 35%, transparent);
}
.about-hero-logo svg {
  width: 30px;
  height: 30px;
  display: block;
}
.about-hero-tx {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.about-hero-tx b {
  font-size: calc(20px * var(--fs-scale, 1));
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--text-primary);
  line-height: 1.3;
}
.about-hero-tx span {
  font-size: calc(13px * var(--fs-scale, 1));
  color: var(--text-secondary);
  line-height: 1.7;
}
.about-hero-ver {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  flex-shrink: 0;
}
.about-hero-ver small {
  font-size: calc(10.5px * var(--fs-scale, 1));
  color: var(--text-tertiary);
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.about-hero-ver span {
  font-family: var(--font-mono, monospace);
  font-size: calc(13px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--ac);
  font-variant-numeric: tabular-nums;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}
.about-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--surface-nested);
  border: 1px solid var(--border-subtle);
}
.about-card-lb {
  font-size: calc(10.5px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--text-tertiary);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.about-card b {
  font-size: calc(14px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.5;
  overflow-wrap: anywhere;
}
@media (max-width: 560px) {
  .about-hero { flex-direction: column; align-items: flex-start; gap: 12px; }
  .about-hero-ver { align-items: flex-start; }
}

.num-stepper {
  --item-h: 30px;
  --visible: 5;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 38px;
  align-items: stretch;
  gap: 6px;
  height: calc(var(--item-h) * var(--visible));
  padding: 6px;
  box-sizing: content-box;
  border-radius: 16px;
  background: var(--surf-solid);
  border: 1px solid var(--brd);
  box-shadow: inset 0 1px 0 color-mix(in srgb, #fff 3%, transparent);
  transition: border-color .18s var(--ease);
}
.num-stepper--bare {
  grid-template-columns: minmax(0, 1fr);
}
.num-stepper:focus-within {
  border-color: color-mix(in srgb, var(--ac) 40%, var(--brd));
}

.num-stepper-btn {
  align-self: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  border: 1px solid var(--brd);
  background: var(--surf-2);
  color: var(--dim);
  cursor: pointer;
  padding: 0;
  transition:
    background .15s var(--ease),
    color .15s var(--ease),
    border-color .15s var(--ease),
    transform .12s var(--ease);
}
.num-stepper-btn:hover {
  background: color-mix(in srgb, var(--ac) 12%, var(--surf-2));
  border-color: color-mix(in srgb, var(--ac) 40%, var(--brd));
  color: var(--txt);
}
.num-stepper-btn:active { transform: scale(.9); }
.num-stepper-btn:focus-visible {
  outline: 2px solid var(--ac);
  outline-offset: 2px;
}

.num-stepper-wheel {
  position: relative;
  height: 100%;
  width: 100%;
  overflow-y: scroll;
  overflow-x: hidden;
  overscroll-behavior: contain;
  scroll-snap-type: y mandatory;
  scroll-behavior: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  touch-action: pan-y;
  cursor: default;
  outline: none;
  border-radius: 12px;
  -webkit-mask-image: linear-gradient(to bottom,
    transparent 0%,
    #000 22%,
    #000 78%,
    transparent 100%);
  mask-image: linear-gradient(to bottom,
    transparent 0%,
    #000 22%,
    #000 78%,
    transparent 100%);
}
.num-stepper-wheel::-webkit-scrollbar { display: none; }
.num-stepper-wheel:focus-visible {
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--ac) 55%, transparent);
}

.num-stepper-frame {
  position: absolute;
  inset-inline: 6px;
  top: 50%;
  transform: translateY(-50%);
  height: var(--item-h);
  border-radius: 9px;
  border: 1px solid color-mix(in srgb, var(--ac) 42%, var(--brd));
  background: color-mix(in srgb, var(--ac) 7%, transparent);
  pointer-events: none;
  z-index: 2;
}

.num-stepper-inner {
  position: relative;
  width: 100%;
}
.num-stepper-spacer {
  height: calc((var(--item-h) * var(--visible) - var(--item-h)) / 2);
  scroll-snap-align: none;
  pointer-events: none;
}
.num-stepper-item {
  height: var(--item-h);
  width: 100%;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  scroll-snap-align: center;
  scroll-snap-stop: always;
  font-family: var(--font-mono);
  font-size: calc(1rem * var(--fs-scale, 1));
  font-weight: 500;
  color: color-mix(in srgb, var(--txt) 38%, transparent);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1, "lnum" 1;
  line-height: 1;
  letter-spacing: -.01em;
  text-align: center;
  transition:
    color .45s var(--ease-soft),
    transform .55s cubic-bezier(.22, 1, .36, 1),
    font-weight .45s var(--ease-soft),
    opacity .45s var(--ease-soft);
  user-select: none;
  -webkit-user-select: none;
}
.num-stepper-item.selected {
  color: var(--txt);
  font-weight: 900;
  transform: scale(1.22);
}
.num-stepper-wheel.is-scrolling .num-stepper-item {
  transition-duration: 70ms;
}

.num-stepper-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 1.2rem;
}
.num-stepper-item-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}
.num-stepper-label {
  font-size: calc(11.5px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--text-tertiary);
  text-align: center;
  letter-spacing: .04em;
  line-height: 1;
}

@media (max-width: 480px) {
  .num-stepper-pair { grid-template-columns: 1fr; gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .num-stepper-wheel { scroll-behavior: auto; }
  .num-stepper-item { transition: none; }
}