/* ============================================================
   BurgerLab — styles.css
   ------------------------------------------------------------
   Hand-authored site (no build step). Follows the visual
   language of engine/scaffold/assets/sky.css + components.css:
   same token vocabulary (--bg / --panel / --surface / --text /
   --muted / --faint / --border / --accent / --radius), frosted
   panels, pill chips, answer-first readouts. Written as plain
   CSS so the page ships with zero external requests — no CDN,
   no webfonts, no framework.

   Palette is a warm charcoal + ember amber. Every foreground /
   background pair below was checked against WCAG 2.1 contrast:
   body text >= 4.5:1, large text and UI boundaries >= 3:1.
     text  #f6f2ee on panel #1c1815 -> 15.8:1
     muted #b8ada4 on panel        ->  8.0:1
     faint #9a8f86 on panel        ->  5.6:1
     accent#f59e0b on panel        ->  8.2:1
     on-accent #17120a on accent   ->  8.7:1   (primary button)
     border-strong #726e6a on panel->  3.5:1   (input outlines)
   ============================================================ */

:root {
  color-scheme: dark;

  --bg: #0d0b0a;
  --panel: #1c1815;
  --surface: #241f1b;
  --surface-2: #2c2622;

  --text: #f6f2ee;
  --muted: #b8ada4;
  --faint: #9a8f86;

  --border: #38322d;
  --border-strong: #726e6a;

  --accent: #f59e0b;
  --accent-bg: rgba(245, 158, 11, 0.14);
  --on-accent: #17120a;

  --good: #4ade80;
  --ember: #ff8f7a;

  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 880px;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(760px 420px at 50% -10%, rgba(245, 158, 11, 0.10), transparent 68%),
    radial-gradient(900px 620px at 50% 110%, rgba(139, 58, 31, 0.12), transparent 62%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

h1, h2, h3 { font-weight: 700; letter-spacing: -0.015em; line-height: 1.2; margin: 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }

.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;
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 50;
  background: var(--accent); color: var(--on-accent);
  font-weight: 700; padding: 10px 16px; border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; text-decoration: none; }

/* ---------- header ---------- */
.site-head { border-bottom: 1px solid var(--border); background: rgba(13, 11, 10, 0.72); }
.head-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding-top: 12px; padding-bottom: 12px;
}
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--text); font-weight: 700; letter-spacing: -0.02em; }
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; display: block; }
.brand-name { font-size: 1.08rem; }
.head-tag { font-size: 0.78rem; color: var(--muted); }
@media (max-width: 460px) { .head-tag { display: none; } }

/* ---------- hero ---------- */
.hero { padding: 22px 0 14px; }
.eyebrow {
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 8px;
}
.hero h1 { font-size: clamp(1.6rem, 5vw, 2.3rem); margin-bottom: 8px; }
.lede { font-size: 0.98rem; color: var(--muted); margin: 0; max-width: 62ch; }

/* ---------- panels ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
}
section.block { margin-top: 26px; }
section.block > h2 { font-size: 1.28rem; margin-bottom: 6px; }
section.block > .intro { color: var(--muted); font-size: 0.92rem; margin: 0 0 14px; max-width: 68ch; }

/* ---------- form ---------- */
.tool { margin-top: 4px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width: 720px) { .grid4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 380px) { .grid4 { grid-template-columns: 1fr; } }

.field { min-width: 0; }
.field > label, .field-label {
  display: block; font-size: 0.76rem; font-weight: 700;
  letter-spacing: 0.03em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 6px;
}
.hint { font-size: 0.78rem; color: var(--faint); margin: 6px 0 0; }

input[type="number"], select {
  width: 100%;
  font: inherit; font-size: 0.98rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  appearance: none; -webkit-appearance: none;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23b8ada4' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center; background-size: 12px;
  padding-right: 32px;
}
input:focus-visible, select:focus-visible {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.combo { display: flex; gap: 8px; }
.combo input { flex: 1 1 auto; min-width: 0; }
.combo select { flex: 0 0 74px; width: 74px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-size: 0.95rem; font-weight: 700;
  padding: 12px 20px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: transparent; color: var(--text);
  cursor: pointer;
  transition: filter 0.12s ease, background 0.12s ease, transform 0.05s ease;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:active { transform: scale(0.99); }
.btn-primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }

.form-err { margin: 0; font-size: 0.86rem; font-weight: 600; color: var(--ember); }
.form-err:empty { display: none; }

/* ---------- answer-first readout ---------- */
.readout {
  margin-top: 18px; padding-top: 18px;
  border-top: 1px solid var(--border);
}
.readout .k {
  display: block; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
}
.readout .v {
  display: block; font-size: clamp(2rem, 8vw, 2.9rem); font-weight: 800;
  line-height: 1.05; letter-spacing: -0.03em; color: var(--accent);
  font-variant-numeric: tabular-nums; margin-top: 4px;
}
.readout .v-alt { display: block; font-size: 0.92rem; color: var(--muted); margin-top: 6px; }

.ministats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
@media (max-width: 420px) { .ministats { grid-template-columns: 1fr; } }
.ministat {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 12px;
}
.ministat .mk { display: block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.ministat .mv { display: block; font-size: 1.1rem; font-weight: 700; margin-top: 3px; font-variant-numeric: tabular-nums; }

/* ---------- key/value list (shopping plan) ---------- */
.list { list-style: none; margin: 0; padding: 0; }
.list li {
  display: flex; flex-wrap: wrap; gap: 8px 14px;
  align-items: baseline; justify-content: space-between;
  padding: 11px 0; border-bottom: 1px solid var(--border);
}
.list li:last-child { border-bottom: 0; }
.list .k { color: var(--muted); font-size: 0.92rem; }
.list .v { font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }
.list .v.hero-v { color: var(--accent); }

/* ---------- chips ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 600;
  padding: 5px 12px; border-radius: 999px;
  color: var(--accent); background: var(--accent-bg);
}

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
table.tbl th, table.tbl td { padding: 10px 13px; text-align: left; border-bottom: 1px solid var(--border); }
table.tbl thead th {
  font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); background: var(--surface); font-weight: 700;
}
table.tbl tbody tr:last-child th, table.tbl tbody tr:last-child td { border-bottom: 0; }
table.tbl tbody th { font-weight: 600; }
table.tbl .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.tbl tfoot td, table.tbl tfoot th { border-top: 1px solid var(--border-strong); font-weight: 700; }

/* ---------- notes ---------- */
.note {
  margin: 14px 0 0; padding: 11px 13px;
  font-size: 0.86rem; color: var(--muted);
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.note strong { color: var(--text); }

/* ---------- reference facts ---------- */
.facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 0; padding: 0; list-style: none; }
@media (max-width: 620px) { .facts { grid-template-columns: 1fr; } }
.facts li {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 15px;
}
.facts .ft { display: block; font-size: 1.15rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.facts .fd { display: block; font-size: 0.88rem; color: var(--muted); margin-top: 5px; }
.facts .fs { display: block; font-size: 0.72rem; color: var(--faint); margin-top: 7px; }

/* ---------- disclosure / FAQ ---------- */
details.faq {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--panel); overflow: hidden;
}
details.faq + details.faq { margin-top: 8px; }
details.faq > summary {
  cursor: pointer; list-style: none;
  padding: 13px 15px; font-size: 0.96rem; font-weight: 700;
  display: flex; align-items: center; gap: 10px;
}
details.faq > summary::-webkit-details-marker { display: none; }
details.faq > summary::after { content: "+"; margin-left: auto; color: var(--accent); font-size: 1.15rem; line-height: 1; }
details.faq[open] > summary::after { content: "\2212"; }
details.faq .faq-body { padding: 0 15px 15px; font-size: 0.9rem; color: var(--muted); }
details.faq .faq-body p { margin: 0 0 9px; }
details.faq .faq-body p:last-child { margin-bottom: 0; }

/* ---------- steps ---------- */
ol.steps { margin: 0; padding-left: 1.15em; color: var(--muted); font-size: 0.92rem; }
ol.steps li { margin-bottom: 8px; }
ol.steps li:last-child { margin-bottom: 0; }
ol.steps strong { color: var(--text); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em; background: var(--surface-2); color: var(--text);
  padding: 1px 6px; border-radius: 5px;
}

/* ---------- footer ---------- */
.site-foot {
  margin-top: 40px; border-top: 1px solid var(--border);
  padding: 22px 0 40px; font-size: 0.82rem; color: var(--faint);
}
.site-foot nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 12px; }
.site-foot nav a { color: var(--muted); font-weight: 600; }
.site-foot p { margin: 0 0 8px; max-width: 70ch; }

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

/* Homepage worksheet. Scoped so the legal pages retain their original layout. */
.worksheet { --maxw: 1120px; }
.worksheet .head-row { padding-top: 16px; padding-bottom: 16px; }
.worksheet .brand-name { font-size: 1.2rem; }
.worksheet .hero { padding: 34px 0 26px; }
.worksheet .hero h1 {
  max-width: 22ch;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.2rem, 4.5vw, 3.35rem);
  font-weight: 400; line-height: 1.08; letter-spacing: -0.035em;
  margin-bottom: 14px;
}
.worksheet .lede { max-width: 65ch; font-size: 1rem; }
.worksheet .worksheet-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 16px; }
.worksheet .worksheet-nav a { font-size: 0.85rem; color: var(--text); text-underline-offset: 4px; }
.worksheet .worksheet-nav span { margin-left: 4px; color: var(--accent); }
.worksheet .card { box-shadow: none; }
.worksheet .tool {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 0; padding: 0; overflow: hidden; border-color: #514235;
}
.worksheet .batch-inputs { padding: 28px; min-width: 0; }
.worksheet .batch-inputs h2 { font-size: 1.2rem; }
.worksheet .batch-hint { color: var(--muted); font-size: 0.87rem; margin: 6px 0 20px; }
.worksheet .tool .grid4 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 16px; }
.worksheet input[type="number"], .worksheet select { min-height: 48px; font-size: 1rem; }
.worksheet .combo select { flex-basis: 68px; width: 68px; }
.worksheet .btn-row { margin-top: 22px; }
.worksheet .btn-primary { min-height: 48px; }
.worksheet .readout {
  display: flex; flex-direction: column; justify-content: center;
  min-width: 0; margin: 0; padding: 32px;
  border: 0; border-left: 1px solid #c9bdaa;
  background: #f1e8d8; color: #221a15;
}
.worksheet .readout .k { color: #655344; font-size: 0.74rem; letter-spacing: 0.1em; }
.worksheet .readout .v {
  color: #813510; font-size: clamp(3.25rem, 7vw, 4.75rem);
  font-weight: 750; line-height: 1.05; margin-top: 12px;
  overflow-wrap: anywhere;
}
.worksheet .readout .v-alt { color: #655344; font-size: 0.95rem; margin-top: 10px; }
.worksheet .ministats {
  grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px;
  margin-top: 26px; padding-top: 20px; border-top: 1px solid #c9bdaa;
}
.worksheet .ministat { border: 0; border-radius: 0; background: none; padding: 0; min-width: 0; }
.worksheet .ministat .mk { color: #655344; letter-spacing: 0.025em; }
.worksheet .ministat .mv { font-size: 1.25rem; overflow-wrap: anywhere; }
.worksheet section.block { margin-top: 36px; scroll-margin-top: 20px; }
.worksheet section.block > h2 { font-size: 1.4rem; }
.worksheet section.block > .intro { max-width: 80ch; }
.worksheet #plan > .card { padding: 6px 24px 20px; }
.worksheet .shopping-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 22px; }
.worksheet .shopping-list li {
  display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-start;
  gap: 6px; min-width: 0; padding: 18px 0 8px; border: 0;
}
.worksheet .shopping-list li:first-child {
  grid-column: 1 / -1; flex-direction: row; align-items: baseline;
  justify-content: space-between; padding: 16px 0; border-bottom: 1px solid var(--border);
}
.worksheet .shopping-list .k { font-size: 0.83rem; }
.worksheet .shopping-list .v { font-size: 1.25rem; text-align: left; overflow-wrap: anywhere; }
.worksheet .shopping-list .hero-v { font-size: 1.6rem; }
.worksheet #plan .note { margin-top: 18px; }
.worksheet #blend > .card, .worksheet #sauce > .card { padding: 24px; }
.worksheet #blend .grid4 { gap: 18px; align-items: start; }
.worksheet #blend .chip { border-radius: 6px; min-height: 48px; padding: 10px 12px; }
.worksheet #blendList .v { font-size: 1.2rem; }
.worksheet .site-foot { margin-top: 48px; }

@media (max-width: 760px) {
  .worksheet .hero { padding-top: 26px; }
  .worksheet .tool { grid-template-columns: minmax(0, 1fr); }
  .worksheet .batch-inputs, .worksheet .readout { padding: 24px; }
  .worksheet .readout { border-left: 0; border-top: 1px solid #c9bdaa; }
  .worksheet .readout .v { font-size: 3.5rem; }
  .worksheet .shopping-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .worksheet #blend .grid4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 420px) {
  .worksheet .wrap { padding-left: 16px; padding-right: 16px; }
  .worksheet .hero h1 { font-size: 2.2rem; }
  .worksheet .worksheet-nav { gap: 8px 16px; }
  .worksheet .batch-inputs, .worksheet .readout { padding: 20px; }
  .worksheet .tool .grid4 { gap: 16px 12px; }
  .worksheet .field > label { font-size: 0.72rem; }
  .worksheet .combo { gap: 5px; }
  .worksheet .combo select { flex-basis: 60px; width: 60px; padding-left: 8px; }
  .worksheet .ministats { gap: 8px; }
  .worksheet .ministat .mv { font-size: 1.1rem; }
  .worksheet #plan > .card, .worksheet #blend > .card, .worksheet #sauce > .card { padding: 18px; }
  .worksheet .shopping-list li:first-child { padding-top: 0; }
  .worksheet .shopping-list .hero-v { font-size: 1.35rem; }
}
@media (max-width: 380px) {
  .worksheet .tool .grid4, .worksheet #blend .grid4 { grid-template-columns: minmax(0, 1fr); }
}