/* YardsCubed — shared styles.
   Layout: brand bar → intro → tool (3D view + estimate side by side, form below) → guide + related list → footer.
   The estimate is styled as a quarry scale ticket: the yellow carbon copy you get at the weigh station. */
:root{
  --bg:#eef0ed; --surface:#ffffff; --ink:#1c2321; --muted:#5a6561; --line:#d3d9d5; --field:#f7f8f6;
  --accent:#c98d14; --accent-ink:#7a5408; --on-accent:#1c1608;
  --ticket:#fbf3cf; --ticket-ink:#2b2510; --ticket-line:#d9c98a;
  --stone-a:#9aa39e; --stone-b:#7f8984; --stone-c:#b7bdb8;
  --font-display:"Barlow Condensed","Arial Narrow","DejaVu Sans Condensed",Arial,sans-serif;
  --font-body:"Source Sans 3","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --step--1:.875rem; --step-0:1rem; --step-1:1.2rem; --step-2:1.55rem; --step-3:2.2rem; --step-4:clamp(2.6rem,6vw,3.6rem);
  --radius:6px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#121615; --surface:#1a201e; --ink:#e6ebe8; --muted:#9ba5a1; --line:#2c3431; --field:#151a19;
    --accent:#e2a63a; --accent-ink:#f0c068; --on-accent:#1c1608;
    --ticket:#29251a; --ticket-ink:#f1e7c2; --ticket-line:#4d4430;
    --stone-a:#58615d; --stone-b:#454d4a; --stone-c:#6b7470;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#121615; --surface:#1a201e; --ink:#e6ebe8; --muted:#9ba5a1; --line:#2c3431; --field:#151a19;
  --accent:#e2a63a; --accent-ink:#f0c068; --on-accent:#1c1608;
  --ticket:#29251a; --ticket-ink:#f1e7c2; --ticket-line:#4d4430;
  --stone-a:#58615d; --stone-b:#454d4a; --stone-c:#6b7470;
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--step-0);line-height:1.55;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--accent-ink)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.05;text-wrap:balance;margin:0;letter-spacing:.005em}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);color:var(--ink);padding:8px 12px;border-radius:var(--radius);z-index:50}
.skip:focus{left:12px}

/* Brand bar */
.bar{border-bottom:1px solid var(--line);background:var(--surface)}
.bar .wrap{display:flex;align-items:center;justify-content:space-between;gap:8px 20px;padding-block:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:var(--step-2);font-weight:700;letter-spacing:.02em;text-transform:uppercase;color:var(--ink);text-decoration:none}
.brand sup{font-size:.55em;margin-left:-.12em;color:var(--accent-ink)}
.brand svg{flex:none}
.nav{min-width:0;max-width:100%;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px}
.nav a{display:block;padding:6px 10px;border-radius:var(--radius);color:var(--ink);text-decoration:none;font-weight:600;font-size:var(--step--1);white-space:nowrap}
.nav a:hover{background:var(--field)}
.nav a[aria-current="page"]{color:var(--accent-ink);background:color-mix(in srgb,var(--accent) 14%,transparent)}
.crumbs{font-size:var(--step--1);color:var(--muted);display:flex;flex-wrap:wrap;gap:4px}
.crumbs a{color:var(--muted)}
.crumbs span[aria-current]{color:var(--ink);font-weight:600}

/* Intro */
.intro{padding-block:24px 20px;display:grid;gap:8px}
.eyebrow{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink)}
.intro h1{font-size:var(--step-4);text-transform:uppercase}
.intro p{margin:0;max-width:62ch;color:var(--muted);font-size:var(--step-1)}
.byline{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:var(--step--1)!important;color:var(--muted);margin-top:4px!important}

/* Tool */
.tool{display:grid;gap:16px;padding-bottom:28px}
.result{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:16px;align-items:start;scroll-margin-top:16px}
.result.no-viz{grid-template-columns:minmax(0,1fr)}
@media (max-width:760px){.result{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:grid;gap:24px;min-width:0}
fieldset{border:0;margin:0;padding:0;display:grid;gap:10px;min-width:0;align-content:start}
legend,.label{font-family:var(--font-mono);font-size:.84rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink);padding:0;margin-bottom:8px}

/* Numbered steps: each group of the form starts with a big heading and a number */
.step-group{display:grid;gap:18px;min-width:0}
.step-group+.step-group{border-top:1px solid var(--line);padding-top:24px}
legend.big,h2.step{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:var(--step-2);font-weight:700;line-height:1.1;letter-spacing:.01em;text-transform:uppercase;color:var(--ink);margin:0 0 6px}
h2.step{margin:0}
.step-n{display:inline-grid;place-items:center;flex:none;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:1.1rem;line-height:1}
h2.step .opt{font-family:var(--font-mono);font-size:.72rem;font-weight:500;letter-spacing:.08em;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:2px 6px}

.projects{display:grid;grid-template-columns:repeat(auto-fit,minmax(112px,1fr));gap:8px}
.project{display:grid;gap:2px;align-content:start;text-align:left;border:1px solid var(--line);background:var(--field);color:var(--ink);border-radius:var(--radius);padding:10px 12px;cursor:pointer;font:inherit;transition:border-color .15s,background .15s}
.project:hover{border-color:var(--muted)}
.project b{font-weight:700;font-size:.95rem;line-height:1.2}
.project small{font-family:var(--font-mono);font-size:.72rem;color:var(--muted);line-height:1.3}
.project[aria-pressed="true"]{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,var(--surface));box-shadow:inset 0 0 0 1px var(--accent)}

/* Material cards: every option visible, with a swatch and what it's for */
.mat-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:8px}
.mat-cards input{position:absolute;opacity:0;pointer-events:none}
.mat{display:grid;grid-template-columns:auto minmax(0,1fr);gap:2px 10px;align-content:start;border:1px solid var(--line);background:var(--field);border-radius:var(--radius);padding:10px 12px;cursor:pointer;transition:border-color .15s,background .15s}
.mat:hover{border-color:var(--muted)}
.mat .swatch{grid-row:span 2;border-radius:5px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.15)}
.mat b{font-weight:700;font-size:.95rem;line-height:1.25;align-self:center}
.mat small{grid-column:2;font-size:.8rem;line-height:1.35;color:color-mix(in srgb,var(--muted) 55%,var(--ink))}
.mat-cards input:checked+.mat{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,var(--surface));box-shadow:inset 0 0 0 1px var(--accent)}
.mat-cards input:focus-visible+.mat{outline:3px solid var(--accent);outline-offset:2px}
.depth-field{max-width:420px}

/* Gentle warnings for numbers that look like typos */
.warn{margin:0;font-size:var(--step--1);font-weight:600;color:var(--ink);background:color-mix(in srgb,var(--accent) 16%,var(--surface));border-left:4px solid var(--accent);border-radius:4px;padding:8px 10px}
.warn::before{content:"⚠ ";color:var(--accent-ink)}
.t-warn{margin:6px 0 4px;font-family:var(--font-body);font-size:.86rem;font-weight:600;line-height:1.4;border-left:3px solid var(--accent);padding-left:8px}

/* Extras: folded away, with a summary of what's set */
.extras summary{list-style:none;cursor:pointer;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 16px}
.extras summary::-webkit-details-marker{display:none}
.extras summary::after{content:"+";font:600 1.4rem/1 var(--font-body);color:var(--muted);order:3}
.extras[open] summary::after{content:"–"}
.extras-sum{font-family:var(--font-mono);font-size:.84rem;color:color-mix(in srgb,var(--muted) 55%,var(--ink));margin-left:auto}
.extras[open]>fieldset{margin-top:18px}

.seg{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg label{border:1px solid var(--line);background:var(--field);border-radius:999px;padding:9px 16px;min-height:40px;cursor:pointer;font-weight:600;font-size:var(--step--1);color:var(--ink);transition:background .15s,border-color .15s}
.seg label:hover{border-color:var(--muted)}
.seg input:checked+label{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.seg input:focus-visible+label{outline:3px solid var(--accent);outline-offset:2px}
.seg label{display:inline-flex;align-items:center;gap:6px}
.seg .ico{flex:none;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linejoin:round;stroke-linecap:round}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.field{display:grid;gap:4px;min-width:0}
.field>label{font-weight:600;font-size:var(--step--1)}
.input{display:flex;align-items:stretch;border:1px solid var(--line);border-radius:var(--radius);background:var(--field);overflow:hidden}
.input:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.input input,.input select{flex:1;min-width:0;border:0;background:transparent;color:var(--ink);font:500 var(--step-1)/1.2 var(--font-mono);padding:10px 12px;font-variant-numeric:tabular-nums}
.input input.in-part{flex:0 0 3.2em;padding-left:10px;padding-right:6px;border-left:1px solid var(--line)}
.input input:focus,.input select:focus{outline:none}
.input .unit{display:flex;align-items:center;padding:0 10px;font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted);border-left:1px solid var(--line);background:var(--surface)}
.input .unit.pre{border-left:0;border-right:1px solid var(--line)}
.stepper{display:flex;flex-direction:column;flex:none;width:26px;border-left:1px solid var(--line)}
.stepper button{flex:1;border:0;padding:0;margin:0;background:var(--surface);color:var(--muted);font-size:10px;line-height:1;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.stepper button+button{border-top:1px solid var(--line)}
.stepper button:hover{color:var(--ink);background:var(--field)}
.stepper button:active{color:var(--on-accent);background:var(--accent)}
/* Touch screens: wide − / + buttons instead of the slim arrows. Inch boxes are easy to type in, so they skip the buttons. */
@media (pointer:coarse){
  .stepper{flex-direction:row;width:auto;border-left:0}
  .stepper button{width:44px;font-size:0;border-left:1px solid var(--line)}
  .stepper button+button{border-top:0}
  .stepper button::before{font-size:1.4rem;font-weight:600;line-height:1;color:var(--ink)}
  .stepper button[data-dir="1"]::before{content:"+"}
  .stepper button[data-dir="-1"]::before{content:"−"}
  .stepper button[data-dir="-1"]{order:-1}
  .stepper.in-part{display:none}
}
select{appearance:none;-webkit-appearance:none;cursor:pointer}
.select{position:relative}
.select::after{content:"";position:absolute;right:14px;top:50%;width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:translateY(-70%) rotate(45deg);pointer-events:none}
.select select{font-family:var(--font-body);font-weight:600;font-size:var(--step-0);padding-right:36px}
.hint{font-size:var(--step--1);color:color-mix(in srgb,var(--muted) 55%,var(--ink));margin:0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.split.one{grid-template-columns:1fr}
@media (max-width:460px){.split{grid-template-columns:1fr}}
.example{justify-self:start;font-size:var(--step--1);color:var(--ink);display:flex;gap:8px;align-items:center;flex-wrap:wrap;background:color-mix(in srgb,var(--accent) 12%,var(--surface));border:1px solid color-mix(in srgb,var(--accent) 40%,var(--line));border-radius:var(--radius);padding:8px 12px}
.chip{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--line);border-radius:4px;padding:1px 6px;color:var(--muted)}
.example .chip{border-color:var(--accent);color:var(--accent-ink)}
.linkbtn{background:none;border:0;padding:0;color:var(--accent-ink);font:inherit;font-weight:600;text-decoration:underline;cursor:pointer}
.price-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px}

/* Square footage: saved sections, added up */
.sections{display:grid;gap:8px}
.sec-list{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--field)}
.sec-list li{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:4px 12px;align-items:baseline;padding:8px 12px;border-bottom:1px solid var(--line);font-size:var(--step--1)}
.sec-list li:last-child{border-bottom:0}
.sec-list li.cur{color:var(--muted)}
.sec-list .sec-a{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:600;color:var(--ink)}
.sec-total{margin:0;font-family:var(--font-mono);font-weight:600;font-variant-numeric:tabular-nums}

/* Square footage: carry the area into a material calculator */
.cover{display:grid;gap:8px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.cover-k{margin:0;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.cover-links{display:flex;flex-wrap:wrap;gap:6px}
.cover-links a{display:inline-flex;gap:6px;align-items:center;border:1px solid var(--line);background:var(--field);border-radius:999px;padding:6px 14px;font-weight:600;font-size:var(--step--1);color:var(--ink);text-decoration:none}
.cover-links a:hover{border-color:var(--accent)}
.cover-links a span{color:var(--accent-ink)}

/* Weigh ticket */
.ticket-col{display:grid;gap:12px;align-content:start;min-width:0}
.ticket{background:var(--ticket);color:var(--ticket-ink);border-radius:4px;padding:20px 20px 16px;font-family:var(--font-mono);position:relative;box-shadow:0 1px 0 var(--ticket-line),0 10px 24px -18px rgba(0,0,0,.45)}
.ticket::before,.ticket::after{content:"";position:absolute;left:0;right:0;height:8px;background:radial-gradient(circle at 6px 0,var(--bg) 4px,transparent 4.5px) 0 0/12px 8px repeat-x}
.ticket::before{top:-4px}
.ticket::after{bottom:-4px;transform:scaleY(-1)}
.t-head{display:flex;justify-content:space-between;gap:12px;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;border-bottom:1px dashed var(--ticket-line);padding-bottom:10px}
.t-say{font-family:var(--font-body);font-size:var(--step-1);line-height:1.35;margin:14px 0 0}
.t-say b{font-weight:700}
.t-big{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0 12px;padding:14px 0;border-top:2px solid var(--ticket-ink);border-bottom:2px solid var(--ticket-ink)}
.t-big div{display:grid;gap:2px;min-width:0}
.t-big .k{font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;opacity:.8}
.t-big .v{font-size:clamp(1.8rem,5vw,2.3rem);font-weight:600;line-height:1;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.t-big .v small{font-size:.9rem;font-weight:500;margin-left:4px}
.t-order{margin:0 0 4px;font-size:.86rem;line-height:1.45}
.t-order strong{font-weight:600}
.t-more{margin-top:10px;border-top:1px dashed var(--ticket-line)}
.t-more summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;padding:10px 0 6px;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}
.t-more summary::-webkit-details-marker{display:none}
.t-more summary::after{content:"+";font-weight:600}
.t-more[open] summary::after{content:"–"}
.t-rows{display:grid;gap:0;margin:0}
.t-rows div{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-bottom:1px dotted var(--ticket-line);font-size:.84rem}
.t-rows div:last-child{border-bottom:0}
.t-rows dt{opacity:.85}
.t-rows dd{margin:0;font-weight:600;text-align:right;font-variant-numeric:tabular-nums}
.t-empty{padding:28px 0;font-size:.9rem;text-align:center;opacity:.85}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{border:1px solid var(--accent);background:var(--accent);color:var(--on-accent);font:700 var(--step--1) var(--font-body);padding:9px 16px;border-radius:var(--radius);cursor:pointer;letter-spacing:.02em;text-decoration:none;display:inline-block}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn:hover{filter:brightness(1.05)}
.status{font-size:var(--step--1);color:var(--muted);min-height:1.4em}
.copy-fallback{width:100%;font-family:var(--font-mono);font-size:.8rem;background:var(--field);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:8px}

/* Live 3D view of the area */
.viz{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0;height:300px}
.viz canvas{display:block;width:100%;height:100%;touch-action:none;cursor:grab}
.viz canvas:active{cursor:grabbing}
@media (max-width:760px){.viz{height:240px}}
.viz-head{position:absolute;top:0;left:0;right:0;padding:10px 12px 18px;display:flex;justify-content:space-between;gap:8px;pointer-events:none;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);background:linear-gradient(to bottom,var(--surface) 35%,transparent)}
.viz-cap{position:absolute;left:0;right:0;bottom:0;padding:18px 12px 10px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:2px 12px;pointer-events:none;font-family:var(--font-mono);font-size:.76rem;color:var(--ink);background:linear-gradient(to top,var(--surface) 45%,transparent)}
.viz-cap #viz-note{color:var(--muted)}
.viz-empty{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);font-size:var(--step--1);pointer-events:none;padding:16px;text-align:center}

/* Results bar: keeps the answer on screen while the estimate is scrolled away */
.mbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:20;align-items:center;justify-content:space-between;gap:12px;
  background:var(--ticket);color:var(--ticket-ink);border-top:2px solid var(--ticket-ink);
  padding:10px max(16px,env(safe-area-inset-right,0px),calc((100% - 1120px) / 2 + 16px)) calc(10px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px),calc((100% - 1120px) / 2 + 16px));
  transform:translateY(0);transition:transform .2s ease}
.mbar.away{transform:translateY(110%)}
body.has-mbar{padding-bottom:76px}
.mbar-txt{display:grid;min-width:0;font-family:var(--font-mono)}
.mbar-k{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;opacity:.8}
.mbar-v{font-size:1.15rem;font-weight:600;font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mbar .btn{flex:none}

/* Calculator cards (home + related) */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.card{display:grid;gap:4px;align-content:start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;color:var(--ink);text-decoration:none;transition:border-color .15s}
.card:hover{border-color:var(--accent)}
.card b{font-family:var(--font-display);font-size:var(--step-2);text-transform:uppercase;line-height:1}
.card span{font-size:var(--step--1);color:var(--muted)}
.card .chip{justify-self:start;margin-top:6px}
.section-head{display:grid;gap:4px;margin-bottom:14px}
.section-head h2{font-size:var(--step-3);text-transform:uppercase}
.calc-index{padding-block:8px 36px}

/* Guide */
.guide{background:var(--surface);border-top:1px solid var(--line)}
.guide>.wrap{padding-block:40px 48px;display:grid;grid-template-columns:minmax(0,68ch) minmax(0,1fr);gap:48px}
@media (max-width:900px){.guide>.wrap{grid-template-columns:1fr;gap:32px}}
article{display:grid;gap:14px;min-width:0;align-content:start}
article h2{font-size:var(--step-3);text-transform:uppercase;margin-top:22px;scroll-margin-top:16px}
article>h2:first-child,article>header+h2{margin-top:0}
article h3{font-size:var(--step-1);font-family:var(--font-body);font-weight:700;margin-top:6px;letter-spacing:0}
article p{margin:0}
article ul,article ol{margin:0;padding-left:1.2em;display:grid;gap:6px}
.formula{font-family:var(--font-mono);background:var(--field);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:var(--radius);padding:12px 14px;font-size:.92rem;overflow-x:auto;white-space:nowrap}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:500;background:var(--field)}
tr:last-child td{border-bottom:0}
td.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;white-space:nowrap}
.diagram{border:1px solid var(--line);border-radius:var(--radius);background:var(--field);padding:12px;overflow-x:auto}
.diagram svg{display:block;width:100%;min-width:420px;height:auto}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-mono);color:var(--accent-ink)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin-top:8px}
.method{background:var(--field);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;display:grid;gap:8px;font-size:.95rem}
.sources{font-size:var(--step--1);color:var(--muted)}
aside.related{display:grid;gap:12px;align-content:start;position:sticky;top:16px}
@media (max-width:900px){aside.related{position:static}}
aside h2{font-size:var(--step-2);text-transform:uppercase}
.calc-list{list-style:none;margin:0;padding:0;display:grid;gap:0;border-top:1px solid var(--line)}
.calc-list li{border-bottom:1px solid var(--line)}
.calc-list a,.calc-list span.here{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;font-weight:600;color:var(--ink);text-decoration:none}
.calc-list a:hover{color:var(--accent-ink)}
.calc-list span.here{color:var(--accent-ink)}
.calc-list .chip{font-weight:500}
.calc-list span.here .chip{border-color:var(--accent);color:var(--accent-ink)}
.note{font-size:var(--step--1);color:var(--muted)}

/* Plain content pages (About, Privacy…) */
.page{padding-block:28px 56px}
.prose{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(20px,4vw,40px);max-width:76ch;display:grid;gap:14px}
.prose h1{font-size:var(--step-4);text-transform:uppercase}
.prose h2{font-size:var(--step-2);text-transform:uppercase;margin-top:14px}
.prose p,.prose ul{margin:0}
.prose ul{padding-left:1.2em;display:grid;gap:6px}

footer.site{border-top:1px solid var(--line);background:var(--bg)}
footer.site .wrap{padding-block:28px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;font-size:var(--step--1);color:var(--muted)}
footer.site h2{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:8px}
footer.site ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
footer.site a{color:var(--ink);text-decoration:none}
footer.site a:hover{color:var(--accent-ink);text-decoration:underline}
footer.site .fine{grid-column:1/-1;border-top:1px solid var(--line);padding-top:14px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}