/* ==========================================================================
   Formula Bench
   --------------------------------------------------------------------------
   Direction: the maker's bench, seen through its instruments.

   The signature is a live vessel cross-section that fills as you type —
   jar, bottle, or cost column, always a vertical volume filling
   proportionally. It makes the arithmetic physical, which is the one thing
   a number alone can't do.

   Palette is drawn from amber fragrance glass against a cool workshop
   paper — deliberately not the warm-cream-and-clay register that every
   candle brand defaults to.
   ========================================================================== */

:root {
  --paper:     #FFFFFF;
  --paper-2:   #FAF6F9;
  --paper-3:   #F3EAF2;
  --ink:       #261124;
  --ink-2:     #4A3A48;
  --steel:     #7A6878;
  --rule:      #EADCE8;
  --rule-2:    #D7BED4;

  --bench:     #261124;
  --bench-2:   #34182F;
  --bench-3:   #452340;
  --bench-txt: #FFFAEB;
  --bench-dim: #B79BB4;

  --plum:      #643060;
  --plum-lit:  #D7BED4;
  --plum-deep: #4A2247;
  --plum-unit: #A57BA1;
  --flag:      #B0392A;

  --display: "Cormorant Garamond", Georgia, serif;
  --body:    "Public Sans", system-ui, -apple-system, sans-serif;
  --data:    "JetBrains Mono", ui-monospace, monospace;

  --gutter:  clamp(1.25rem, 5vw, 4rem);
  --measure: 33rem;
  --ease:    cubic-bezier(0.22, 0.61, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.68;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

:where(a):focus-visible,
:where(button):focus-visible,
:where(input):focus-visible,
:where(select):focus-visible {
  outline: 2px solid var(--plum);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ==========================================================================
   Masthead
   ========================================================================== */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1rem var(--gutter);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}

.masthead__mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.94rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

/* the mark carries a small filled vessel — the site's own diagram, in miniature */
.masthead__glyph { width: 11px; height: 15px; flex: none; }

.masthead__nav {
  display: flex;
  gap: 1.4rem;
  font-family: var(--data);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.masthead__nav a { color: var(--steel); text-decoration: none; padding: 0.25rem 0; }
.masthead__nav a:hover { color: var(--ink); }
.masthead__nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--plum); }

@media (max-width: 720px) {
  .masthead { position: static; }
  .masthead__nav { gap: 1rem; font-size: 0.62rem; }
}

/* ==========================================================================
   Shell + page head
   ========================================================================== */

.shell { max-width: 76rem; margin: 0 auto; padding: 0 var(--gutter); }

.pagehead { padding: clamp(2.75rem, 7vw, 5rem) 0 2.25rem; max-width: 44rem; }

.eyebrow {
  font-family: var(--data);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--plum-deep);
  margin: 0 0 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.eyebrow::after {
  content: "";
  height: 1px;
  flex: 1;
  max-width: 5rem;
  background: var(--rule-2);
}

.pagehead h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2.15rem, 6vw, 3.5rem);
  line-height: 1.02;
  letter-spacing: -0.028em;
  margin: 0 0 1.1rem;
  text-wrap: balance;
}

.standfirst {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
  max-width: var(--measure);
}

/* ==========================================================================
   The rig — inputs beside the instrument
   ========================================================================== */

.rig {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 24rem);
  gap: clamp(1.75rem, 5vw, 4rem);
  align-items: start;
  padding-bottom: 4rem;
}

@media (max-width: 900px) {
  .rig { grid-template-columns: 1fr; }
  .rig__instrument { order: -1; }
}

/* ---------- inputs ---------- */

.inputs { border-top: 1px solid var(--rule); }

.field { padding: 1.15rem 0; border-bottom: 1px solid var(--rule); }

.field__label {
  display: block;
  font-family: var(--data);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.55rem;
}

.field__hint {
  display: block;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--steel);
  margin-top: 0.55rem;
  max-width: 28rem;
}

.field__row { display: flex; gap: 0.5rem; align-items: stretch; }
.field__row > input { flex: 1; min-width: 0; }

input[type="number"],
select {
  appearance: none;
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-family: var(--data);
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: 2px;
  transition: border-color 140ms var(--ease), background 140ms var(--ease);
}
select {
  background-image: linear-gradient(45deg, transparent 50%, var(--steel) 50%),
                    linear-gradient(135deg, var(--steel) 50%, transparent 50%);
  background-position: calc(100% - 15px) 55%, calc(100% - 10px) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2rem;
}
input[type="number"]:hover, select:hover { border-color: var(--steel); }

.field__unit {
  display: inline-flex;
  align-items: center;
  padding: 0 0.85rem;
  font-family: var(--data);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  background: var(--paper-2);
  border: 1px solid var(--rule-2);
  border-radius: 2px;
  white-space: nowrap;
}

.field__select { flex: none; width: auto; min-width: 6rem; }

/* segmented control */
.seg {
  display: inline-flex;
  border: 1px solid var(--rule-2);
  border-radius: 2px;
  overflow: hidden;
  background: var(--paper);
}
.seg > button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0.6rem 0.95rem;
  font-family: var(--data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
  cursor: pointer;
  transition: background 140ms var(--ease), color 140ms var(--ease);
}
.seg > button + button { border-left: 1px solid var(--rule-2); }
.seg > button:hover { background: var(--paper-2); }
.seg > button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

/* ==========================================================================
   The instrument — signature element
   ========================================================================== */

.instrument {
  position: sticky;
  top: 5.25rem;
  background: var(--bench);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: inset 0 1px 0 var(--bench-3), 0 18px 40px -26px rgba(0,0,0,0.55);
}

@media (max-width: 900px) { .instrument { position: static; } }

.instrument__cap {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--bench-3);
  font-family: var(--data);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bench-dim);
}
.instrument__cap b { color: var(--plum-lit); font-weight: 500; }

/* --- the vessel diagram --- */

.vessel {
  padding: 1.5rem 1.25rem 0.5rem;
  display: flex;
  justify-content: center;
}
.vessel svg { width: 100%; max-width: 15rem; height: auto; overflow: visible; }

.vessel__glass  { fill: none; stroke: #7A5C77; stroke-width: 2.5; }
.vessel__void   { fill: #1B0C1A; }
.vessel__pour   { fill: url(#pourGrad); transition: y 480ms var(--ease), height 480ms var(--ease); }
.vessel__liquid { fill: url(#baseGrad); transition: y 480ms var(--ease), height 480ms var(--ease); }
.vessel__oil    { fill: var(--plum-lit); opacity: 0.85; transition: y 480ms var(--ease), height 480ms var(--ease); }
.vessel__line   { stroke: var(--plum-lit); stroke-width: 1; stroke-dasharray: 3 3; opacity: 0.55; transition: transform 480ms var(--ease); }
.vessel__wick   { stroke: #8A7A88; stroke-width: 2; stroke-linecap: round; transition: transform 480ms var(--ease); }
.vessel__reed   { stroke: #C2A8BF; stroke-width: 2.5; stroke-linecap: round; }
.vessel__hatch  { fill: url(#hatch); opacity: 0.18; }

.vessel__tick {
  font-family: var(--data);
  font-size: 8px;
  letter-spacing: 0.1em;
  fill: var(--bench-dim);
  text-transform: uppercase;
}
.vessel__leader { stroke: #4A2C46; stroke-width: 1; }

/* --- composition bar --- */

.mix { padding: 0.25rem 1.25rem 1.25rem; }
.mix__bar {
  display: flex;
  height: 8px;
  border-radius: 1px;
  overflow: hidden;
  background: var(--bench-2);
}
.mix__seg { transition: flex-grow 480ms var(--ease); }
.mix__seg--a { background: #8A5C84; }
.mix__seg--b { background: var(--plum-lit); }
.mix__key {
  display: flex;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-family: var(--data);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bench-dim);
}
.mix__key i { font-style: normal; color: var(--bench-txt); }

/* --- numeric readout --- */

.readout { padding: 1.25rem; border-top: 1px solid var(--bench-3); }

.readout__hero { margin-bottom: 1.1rem; }
.readout__value {
  display: block;
  font-family: var(--data);
  font-weight: 700;
  font-size: clamp(2.2rem, 6.5vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--plum-lit);
}
.readout__value .u {
  font-size: 0.36em;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--plum-unit);
  margin-left: 0.4em;
}
.readout__tag {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--data);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bench-dim);
}

.readout__rows { margin: 0; border-top: 1px solid var(--bench-3); padding-top: 0.65rem; }
.readout__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.38rem 0;
  font-family: var(--data);
}
.readout__row dt {
  font-size: 0.64rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--bench-dim);
}
.readout__row dd { margin: 0; font-size: 0.86rem; font-weight: 500; color: var(--bench-txt); }
.readout__row dd .u { color: var(--bench-dim); font-size: 0.8em; margin-left: 0.2em; }
.readout__row--total { border-top: 1px solid var(--bench-3); margin-top: 0.45rem; padding-top: 0.7rem; }
.readout__row--total dd { color: var(--bench-txt); font-weight: 700; font-size: 0.95rem; }

.readout__note {
  margin: 1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--bench-3);
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--bench-dim);
}
.readout__note--warn { color: #E8A98F; }

/* settle flicker on change */
.settling { animation: settle 220ms var(--ease); }
@keyframes settle {
  from { opacity: 0.4; transform: translateY(-1px); }
  to   { opacity: 1; transform: none; }
}

/* ==========================================================================
   Cost column (cost page instrument)
   ========================================================================== */

.stack { padding: 1.5rem 1.25rem 0.75rem; display: flex; gap: 1.1rem; align-items: stretch; }
.stack__col {
  width: 46px;
  flex: none;
  display: flex;
  flex-direction: column-reverse;
  border-radius: 2px;
  overflow: hidden;
  background: var(--bench-2);
  min-height: 190px;
}
.stack__seg { transition: flex-grow 480ms var(--ease); min-height: 1px; }
.stack__legend { flex: 1; display: flex; flex-direction: column-reverse; justify-content: space-between; }
.stack__item {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--data);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--bench-dim);
  padding: 0.1rem 0;
}
.stack__item b { color: var(--bench-txt); font-weight: 500; margin-left: auto; }
.stack__chip { width: 9px; height: 9px; border-radius: 1px; flex: none; }

/* ==========================================================================
   Prose
   ========================================================================== */

.prose { max-width: var(--measure); padding: 0 0 3rem; }
.prose > *:first-child { margin-top: 0; }

.prose h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  letter-spacing: -0.018em;
  line-height: 1.15;
  margin: 3rem 0 1rem;
}

.prose h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.06rem;
  letter-spacing: -0.005em;
  margin: 2rem 0 0.5rem;
}

.prose p { margin: 0 0 1.1rem; }
.prose ul { margin: 0 0 1.1rem; padding-left: 1.15rem; }
.prose li { margin-bottom: 0.4rem; }
.prose strong { font-weight: 600; }

.section-rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

.formula {
  font-family: var(--data);
  font-size: 0.86rem;
  line-height: 1.85;
  color: var(--ink-2);
  background: var(--paper-2);
  border-left: 2px solid var(--plum);
  padding: 1.1rem 1.2rem;
  margin: 1.4rem 0;
  overflow-x: auto;
  white-space: pre;
}

.worked {
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 1.2rem 1.35rem;
  margin: 1.4rem 0;
}
.worked h3 { margin-top: 0; }
.worked dl {
  display: grid;
  grid-template-columns: minmax(6rem, auto) 1fr;
  gap: 0.35rem 1.25rem;
  margin: 0;
  font-family: var(--data);
  font-size: 0.83rem;
}
.worked dt { color: var(--steel); }
.worked dd { margin: 0; color: var(--ink); }

.flag {
  border-left: 2px solid var(--flag);
  padding: 0.2rem 0 0.2rem 1.15rem;
  margin: 1.4rem 0;
  color: var(--ink-2);
}
.flag p { margin: 0; }

/* ==========================================================================
   Bench index
   ========================================================================== */

.benches { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }

.bench-item > a {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.6rem 0.75rem 1.6rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: background 160ms var(--ease), padding-left 160ms var(--ease);
}
.bench-item > a:hover { background: var(--paper-2); padding-left: 0.75rem; }
.bench-item > a:hover .bench-item__go { color: var(--flag); transform: translateX(3px); }

.bench-item__unit {
  font-family: var(--data);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--plum-deep);
}
.bench-item__name {
  display: block;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.012em;
  margin-bottom: 0.15rem;
}
.bench-item__what { display: block; font-size: 0.94rem; color: var(--steel); line-height: 1.45; }
.bench-item__go {
  font-family: var(--data);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  transition: color 160ms var(--ease), transform 160ms var(--ease);
}

.bench-item--soon > span { opacity: 0.55; }
.bench-item--soon {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.6rem 0.75rem 1.6rem 0;
  border-bottom: 1px solid var(--rule);
}

@media (max-width: 640px) {
  .bench-item > a, .bench-item--soon { grid-template-columns: 1fr; gap: 0.4rem; }
  .bench-item__go { display: none; }
}

/* ==========================================================================
   Home hero
   ========================================================================== */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 20rem);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4rem);
}
@media (max-width: 880px) { .hero { grid-template-columns: 1fr; } }

.hero h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2.6rem, 8.5vw, 4.75rem);
  line-height: 0.96;
  letter-spacing: -0.038em;
  margin: 0 0 1.35rem;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--plum-deep); }

.hero__demo { background: var(--bench); border-radius: 4px; overflow: hidden; }
.hero__strip {
  display: flex;
  justify-content: space-between;
  padding: 0.85rem 1.1rem 1.1rem;
  border-top: 1px solid var(--bench-3);
  font-family: var(--data);
}
.hero__stat { text-align: left; }
.hero__stat b { display: block; font-size: 1rem; font-weight: 700; color: var(--plum-lit); }
.hero__stat span {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--bench-dim);
  margin-top: 0.2rem;
}

/* ==========================================================================
   Upsell + footer
   ========================================================================== */

.upsell {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: space-between;
  background: var(--paper-2);
  border-left: 2px solid var(--ink);
  padding: 1.5rem 1.6rem;
  margin: 0 0 3rem;
  max-width: var(--measure);
}
.upsell p { margin: 0; font-size: 0.96rem; line-height: 1.5; max-width: 24rem; }
.upsell b { font-family: var(--display); font-weight: 700; }

.btn {
  display: inline-block;
  font-family: var(--data);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 0.75rem 1.15rem;
  border-radius: 2px;
  white-space: nowrap;
  transition: background 160ms var(--ease);
}
.btn:hover { background: var(--flag); }

.colophon {
  border-top: 1px solid var(--rule);
  padding: 2.25rem var(--gutter) 3.5rem;
  font-family: var(--data);
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  color: var(--steel);
  line-height: 1.9;
}
.colophon nav { display: flex; gap: 1.4rem; flex-wrap: wrap; margin-bottom: 1rem; }
.colophon a { color: var(--steel); text-decoration: none; }
.colophon a:hover { color: var(--ink); }
.colophon p { margin: 0; max-width: 34rem; }

.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;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .settling { animation: none; }
  .vessel__pour, .vessel__liquid, .vessel__oil, .vessel__line,
  .vessel__wick, .mix__seg, .stack__seg { transition: none; }
}