/* ============================================================
   Reckoner — shared design system  ("Site-grade instrument")
   Single source of truth: ../../brand/design-system.md
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@600;700;800&family=Hanken+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@500;700&display=swap');

:root{
  /* palette */
  --paper:#F4F4F1;
  --concrete:#E4E4DF;
  --concrete-2:#EDEDE9;
  --steel:#6B7075;
  --steel-line:#C9C9C2;
  --ink:#1B1D20;
  --ink-2:#2A2D31;
  --hi-vis:#F3C300;
  --hi-vis-deep:#D9A800;

  /* type */
  --display:'Archivo',system-ui,sans-serif;
  --body:'Hanken Grotesk',system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;

  /* space + form */
  --r:10px;
  --r-lg:16px;
  --pad:clamp(16px,4vw,28px);
  --maxw:1160px;
  --shadow:0 1px 0 rgba(27,29,32,.04), 0 12px 28px -18px rgba(27,29,32,.35);
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.55;
  font-size:18px;
  /* signature: faint reinforcing-mesh grid (steel mesh inside a slab) */
  background-image:
    linear-gradient(rgba(27,29,32,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27,29,32,.035) 1px, transparent 1px);
  background-size:34px 34px;
  background-position:-1px -1px;
}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}

/* ---------- type ---------- */
h1,h2,h3{font-family:var(--display);line-height:1.04;letter-spacing:-.02em;font-weight:800}
h1{font-size:clamp(2rem,5.5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem);letter-spacing:-.015em}
h3{font-size:1.15rem;font-weight:700;letter-spacing:-.01em}
p{max-width:64ch}
a{color:inherit}

.eyebrow{
  font-family:var(--mono);font-weight:700;font-size:.72rem;
  letter-spacing:.18em;text-transform:uppercase;color:var(--ink);
  display:inline-flex;align-items:center;gap:.55em;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--hi-vis-deep)}

.lede{font-size:clamp(1.11rem,2vw,1.28rem);color:var(--ink-2)}

/* two-line brand tagline (no leading dash) */
.kicker{font-family:var(--mono);font-weight:700;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink);line-height:1.7;margin:0}

/* ---------- site chrome ---------- */
.masthead{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding-block:18px;border-bottom:1px solid var(--steel-line);
}
/* ---------- SlabSet logo lockup (Stabila-style tool brand) ---------- */
.logo{display:inline-flex;align-items:center;gap:12px;text-decoration:none}
.logo-mark{width:40px;height:40px;flex:0 0 auto;display:block}
.logo-word{font-family:var(--display);font-weight:800;font-size:1.5rem;letter-spacing:-.035em;color:var(--ink);line-height:1}
.logo-word .set{background:var(--hi-vis);color:var(--ink);padding:.02em .2em .04em;border-radius:3px;margin-left:.08em}
.logo-tag{font-family:var(--mono);font-weight:500;font-size:.64rem;letter-spacing:.22em;text-transform:uppercase;color:var(--steel);align-self:center;padding-left:12px;border-left:1px solid var(--steel-line)}
@media(max-width:520px){.logo-tag{display:none}}
.masthead nav{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;color:var(--steel);text-transform:uppercase}
.masthead nav a{text-decoration:none}
.masthead nav a:hover{color:var(--ink)}

.foot{border-top:1px solid var(--steel-line);margin-top:64px;padding-block:32px;color:var(--steel);font-size:.92rem}
.foot .mono{font-family:var(--mono)}

/* ---------- panels ---------- */
.panel{
  background:var(--concrete-2);border:1px solid var(--steel-line);
  border-radius:var(--r-lg);box-shadow:var(--shadow);
}

/* ---------- calculator layout ---------- */
.calc{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(18px,2.5vw,30px);align-items:start}
@media (max-width:840px){.calc{grid-template-columns:1fr}}

.controls{padding:clamp(18px,3vw,28px)}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px}
@media (max-width:460px){.field-grid{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-weight:600;font-size:.96rem}
.field .hint{font-size:.84rem;color:var(--steel)}

.input{position:relative;display:flex;align-items:center}
.input input,.input select{
  width:100%;font-family:var(--mono);font-weight:500;font-size:1.05rem;color:var(--ink);
  background:#fff;border:1.5px solid var(--steel-line);border-radius:var(--r);
  padding:12px 14px;transition:border-color .12s, box-shadow .12s;
}
.input input{padding-right:46px}
.input select{appearance:none;font-family:var(--body);font-weight:600;cursor:pointer}
.input .unit{position:absolute;right:14px;font-family:var(--mono);font-size:.91rem;color:var(--steel);pointer-events:none}
.input input:focus,.input select:focus,.seg button:focus-visible{
  outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(243,195,0,.45)
}
@media (min-width:841px){
  #dims input[type=number]::-webkit-inner-spin-button,
  #dims input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
  #dims input[type=number]{-moz-appearance:textfield;appearance:textfield}
}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}

/* segmented toggles (shape, mode, bag size) */
.seg{display:inline-flex;flex-wrap:wrap;gap:6px;background:var(--concrete);border:1px solid var(--steel-line);border-radius:var(--r);padding:5px}
.seg button{
  font-family:var(--body);font-weight:600;font-size:.92rem;color:var(--steel);
  background:transparent;border:0;border-radius:7px;padding:8px 13px;cursor:pointer;transition:.12s;
}
.seg button:hover{color:var(--ink)}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}

.row{display:flex;flex-wrap:wrap;gap:18px;align-items:flex-end;margin-top:4px}
.shape-hint,.dim-hint{margin:0 0 12px}
.field.price-flash .input input{border-color:var(--hi-vis-deep);box-shadow:0 0 0 3px rgba(243,195,0,.35);transition:border-color .2s,box-shadow .2s}
.block-label{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);margin-bottom:8px;display:block}
.divider{height:1px;background:var(--steel-line);margin:22px 0}

.btn{
  font-family:var(--display);font-weight:700;font-size:.98rem;letter-spacing:-.01em;
  border:0;border-radius:var(--r);padding:13px 22px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:.5ch;
}
.btn-primary{background:var(--hi-vis);color:var(--ink);box-shadow:0 6px 16px -8px var(--hi-vis-deep)}
.btn-primary:hover{background:var(--hi-vis-deep)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--steel-line)}
.btn-ghost:hover{border-color:var(--ink)}

/* ---------- the result "slab" (signature) ---------- */
.slab{
  position:sticky;top:18px;background:var(--ink);color:#fff;border-radius:var(--r-lg);
  padding:clamp(20px,3vw,30px);overflow:hidden;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:30px 30px;
}
@media (max-width:840px){.slab{position:static}}
.slab .block-label{color:rgba(255,255,255,.55)}
.slab-headline{display:flex;align-items:baseline;gap:.5ch;flex-wrap:wrap;margin:6px 0 2px}
.slab-figure{
  font-family:var(--mono);font-weight:700;font-size:clamp(2.7rem,8vw,3.9rem);
  line-height:1;letter-spacing:-.03em;color:#fff;
  /* hi-vis measurement tick under the figure */
  padding-bottom:6px;box-shadow:inset 0 -4px 0 var(--hi-vis);
}
.slab-unit{font-family:var(--mono);font-weight:500;font-size:1.4rem;color:var(--hi-vis)}
.slab-note{color:rgba(255,255,255,.6);font-size:.9rem;margin-top:14px}

.readouts{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:rgba(255,255,255,.12);border-radius:var(--r);overflow:hidden;margin-top:20px}
.readout{background:var(--ink-2);padding:14px 15px}
.readout .k{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.5)}
.readout .v{font-family:var(--mono);font-weight:700;font-size:1.32rem;margin-top:4px}
.readout .v small{font-weight:500;font-size:.86rem;color:rgba(255,255,255,.6)}

/* working / breakdown */
.working{list-style:none;display:flex;flex-direction:column;gap:9px;margin-top:8px}
.working li{display:flex;justify-content:space-between;gap:1rem;font-size:.98rem;padding-bottom:9px;border-bottom:1px dashed var(--steel-line)}
.working li:last-child{border-bottom:0}
.working .n{font-family:var(--mono);font-weight:500;color:var(--ink)}
.working .lbl{color:var(--steel)}

/* prose sections */
.section{margin-top:clamp(40px,7vw,72px)}
.prose h3{margin:26px 0 8px}
.prose p{margin-bottom:12px}
.formula{font-family:var(--mono);font-size:.98rem;background:var(--concrete);border-left:3px solid var(--hi-vis-deep);border-radius:0 8px 8px 0;padding:12px 16px;margin:10px 0;overflow-x:auto}

.faq details{border:1px solid var(--steel-line);border-radius:var(--r);background:var(--concrete-2);padding:2px 18px;margin-bottom:10px}
.faq summary{font-family:var(--display);font-weight:700;font-size:1.02rem;padding:15px 0;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--hi-vis-deep);font-size:1.3rem}
.faq details[open] summary::after{content:"–"}
.faq details p{padding-bottom:16px;color:var(--ink-2)}

/* hub catalog cards */
.catalog{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:8px}
.card{
  display:flex;flex-direction:column;gap:8px;text-decoration:none;
  background:var(--concrete-2);border:1px solid var(--steel-line);border-radius:var(--r-lg);
  padding:20px;transition:transform .12s, border-color .12s, box-shadow .12s;
}
.card[href]:hover{transform:translateY(-3px);border-color:var(--ink);box-shadow:var(--shadow)}
.card .tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--steel)}
.card h3{font-size:1.18rem}
.card p{font-size:.96rem;color:var(--steel);margin:0}
.card.soon{opacity:.62}
.card .pill{margin-top:auto;font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--hi-vis-deep);font-weight:700}
.card.soon .pill{color:var(--steel)}

.is-error{border-color:#c0392b!important}
.err-msg{color:#c0392b;font-size:.91rem;min-height:1em}

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

/* ---------- v2: toggle switch ---------- */
.switch{display:flex;align-items:center;gap:11px;cursor:pointer;font-weight:600;font-size:1.01rem;-webkit-tap-highlight-color:transparent}
.switch input{position:absolute;opacity:0;width:0;height:0}
.switch-track{position:relative;flex:0 0 auto;width:46px;height:27px;border-radius:99px;background:var(--steel-line);transition:background .15s}
.switch-track::after{content:"";position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .15s}
.switch input:checked + .switch-track{background:var(--hi-vis-deep)}
.switch input:checked + .switch-track::after{transform:translateX(19px)}
.switch input:focus-visible + .switch-track{box-shadow:0 0 0 3px rgba(243,195,0,.45)}

/* ---------- v2: best-buy verdict + warning ---------- */
.verdict{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:18px;padding:13px 15px;border-radius:var(--r);background:rgba(243,195,0,.12);border:1px solid rgba(243,195,0,.4)}
.verdict-tag{font-family:var(--mono);font-weight:700;font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);background:var(--hi-vis);padding:4px 8px;border-radius:5px;flex:0 0 auto}
.verdict #verdictText,.verdict span:last-child{font-size:.98rem;color:#fff;line-height:1.4}
.slab .verdict #verdictText{color:#fff}
.warn{display:flex;gap:8px;margin-top:12px;padding:11px 14px;border-radius:var(--r);background:rgba(255,255,255,.06);border-left:3px solid var(--hi-vis);font-size:.91rem;color:rgba(255,255,255,.82);line-height:1.45}
.warn::before{content:"!";font-family:var(--mono);font-weight:700;color:var(--hi-vis);flex:0 0 auto}

/* ---------- v2: mobile live readout bar (the instrument) ---------- */
.readbar{position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;align-items:center;gap:12px;
  padding:9px 16px calc(9px + env(safe-area-inset-bottom));
  background:var(--ink);color:#fff;border-top:2px solid var(--hi-vis);
  box-shadow:0 -10px 28px -14px rgba(0,0,0,.6);
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:24px 24px}
.readbar-fig{font-family:var(--mono);font-weight:700;font-size:1.9rem;line-height:1;display:flex;align-items:baseline;gap:3px;box-shadow:inset 0 -3px 0 var(--hi-vis);padding-bottom:3px}
.readbar-unit{font-size:.84rem;color:var(--hi-vis);font-weight:500}
.readbar-sub{font-family:var(--mono);font-size:.76rem;letter-spacing:.02em;color:rgba(255,255,255,.62);margin-left:auto;text-align:right;line-height:1.35;max-width:46%}
.readbar-jump{flex:0 0 auto;width:38px;height:38px;border:0;border-radius:9px;background:var(--hi-vis);color:var(--ink);font-size:1.1rem;font-weight:700;cursor:pointer}

/* ---------- v2: mobile-first instrument polish ---------- */
@media (max-width:840px){
  .readbar{display:flex}
  body{padding-bottom:78px}
  .calc{gap:20px}
  .controls{padding:18px 16px}
  /* bigger, tactile targets */
  .input input,.input select{font-size:16px;padding:14px 14px;min-height:52px}
  .input input{padding-right:46px}
  .seg{width:100%;gap:5px;flex-wrap:nowrap}
  .seg button{flex:1 1 0;min-width:0;padding:11px 8px;font-size:.96rem;min-height:46px;white-space:nowrap}
  #meshSeg button{font-size:.72rem;padding:8px 6px}
  .btn{width:100%;justify-content:center;padding:16px;font-size:1.05rem}
  /* the result reads as a panel-mounted gauge */
  .slab{border-radius:14px}
  .slab-figure{font-size:3.4rem}
  .readouts .v{font-size:1.24rem}
}

/* ensure [hidden] always wins over component display rules */
[hidden]{display:none!important}

/* ---------- v2.1: iPhone fit hardening ---------- */
/* NOTE: do NOT put overflow-x:hidden on html/body — it breaks position:fixed
   (the readout bar) on iOS Safari. Overflow is contained at the source instead. */
.calc,.controls,.slab,.panel,.readouts{min-width:0;max-width:100%}
.working li{flex-wrap:wrap}
img,svg{max-width:100%}

/* readout bar: fixed width = viewport; let the sub text shrink, never overflow */
.readbar{overflow:hidden}
.readbar-fig{flex:0 0 auto;white-space:nowrap}
.readbar-jump{flex:0 0 auto}
.readbar-sub{flex:1 1 auto;min-width:0;max-width:none;margin-left:auto;
  overflow:hidden;text-overflow:ellipsis}

@media (max-width:840px){
  .wrap{padding-inline:15px}
  body{padding-bottom:calc(84px + env(safe-area-inset-bottom))}
  .readbar-fig{font-size:1.7rem}
}