:root {
  --bt-bg:     #fef8cc;
  --bt-border: #ead860;
  --bt-text:   #785800;
  --bt-mid:    #b08000;
  --bt-dark:   #3a2800;
}

/* ---- Hero ---- */
.app-hero {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem 1.1rem;
}
.app-hero--butter {
  background: var(--bt-bg);
  border-bottom-color: var(--bt-border);
}
.app-hero__inner { margin: 0 auto; }
.app-hero__title {
  font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800;
  color: var(--bt-text); letter-spacing: -.02em;
  margin: 0 0 .5rem; line-height: 1.2;
}
.app-hero__desc {
  font-size: .9rem; color: var(--color-text-secondary);
  max-width: 660px; line-height: 1.6; margin: 0 0 .85rem;
}
.app-hero__chips { display: flex; flex-wrap: wrap; gap: .35rem; }
.hero-chip {
  display: inline-flex; align-items: center;
  padding: .22rem .65rem; font-size: .72rem; font-weight: 700;
  background: var(--color-surface); border: 1.5px solid var(--bt-border);
  border-radius: var(--radius-full); color: var(--bt-text); white-space: nowrap;
}

/* ---- Layout ---- */
.bpc-wrap {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem 0 3rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--radius-xl);
  padding: 1rem 1.125rem;
}

.card-title {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--bt-text);
  margin: 0 0 .75rem;
}

.field { margin-bottom: .7rem; }
.field:last-child { margin-bottom: 0; }

label.lbl {
  display: block;
  font-size: .72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: .28rem;
}

select.sel, input.num-in {
  width: 100%;
  box-sizing: border-box;
  padding: .4rem .6rem;
  font-size: .8rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color .15s;
}
select.sel:focus, input.num-in:focus { outline: none; border-color: var(--bt-mid); }

/* ---- Toggles (units / scale mode) ---- */
.controls-card { }
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.controls-row > div { flex: 1; min-width: 200px; }

.unit-toggle {
  display: flex;
  border: 1.5px solid var(--bt-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.unit-toggle button {
  flex: 1; padding: .32rem .5rem; font-size: .74rem; font-weight: 600;
  background: none; border: none; cursor: pointer; color: var(--color-text-muted);
  transition: background .15s, color .15s;
}
.unit-toggle button.active { background: var(--bt-bg); color: var(--bt-text); }

/* ---- Pan cards ---- */
.pan-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.shape-toggle {
  display: flex;
  border: 1.5px solid var(--bt-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: .75rem;
}
.shape-toggle button {
  flex: 1; padding: .32rem .4rem; font-size: .72rem; font-weight: 600;
  background: none; border: none; cursor: pointer; color: var(--color-text-muted);
  transition: background .15s, color .15s;
}
.shape-toggle button.active { background: var(--bt-bg); color: var(--bt-text); }

.dim-fields {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .7rem .6rem;
}

/* ---- Comparison ---- */
.comparison-card { }
.pan-figures {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: .75rem;
}
.pan-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.pan-figure svg { display: block; }
.pan-figure__label {
  font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; color: var(--bt-text);
  margin: .35rem 0 .1rem;
}
.pan-figure__area { font-size: .76rem; color: var(--color-text-muted); margin: 0; }
.pan-figure__arrow { font-size: 1.6rem; color: var(--bt-mid); }

.scale-factor-row {
  display: flex; align-items: baseline; justify-content: center; gap: .5rem;
  padding-top: .6rem; border-top: 1.5px solid var(--bt-border);
  font-size: .85rem; color: var(--color-text-secondary);
}
.scale-factor-val { font-size: 1.6rem; font-weight: 800; color: var(--bt-dark); }

.scale-warning {
  margin: .6rem 0 0;
  padding: .5rem .7rem;
  background: #fff7d0; border: 1px solid #f0d878;
  border-radius: var(--radius-md);
  font-size: .78rem; color: var(--bt-text); line-height: 1.5;
}

/* ---- Ingredients ---- */
.ingredient-hdr {
  display: grid;
  grid-template-columns: 1.4fr .8fr .7fr .9fr auto;
  gap: .35rem;
  font-size: .63rem;
  color: var(--color-text-muted);
  margin-bottom: .3rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  align-items: center;
}

.row-entry {
  display: grid;
  gap: .35rem;
  align-items: center;
  margin-bottom: .5rem;
  padding-bottom: .5rem;
  border-bottom: 1px dashed var(--color-border);
}
.row-entry:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.row-entry input { font-size: .76rem; padding: .35rem .4rem; }

.ingredient-entry { grid-template-columns: 1.4fr .8fr .7fr .9fr auto; }

.ing-scaled {
  display: flex; align-items: baseline; gap: .25rem;
  font-size: .85rem; font-weight: 700; color: var(--bt-dark);
  padding: .35rem .1rem;
}
.ing-scaled-unit { font-size: .68rem; font-weight: 600; color: var(--color-text-muted); }

.row-entry .rm-btn {
  width: 22px; height: 22px;
  background: none; border: 1px solid var(--color-border);
  border-radius: 50%; cursor: pointer; font-size: .85rem; line-height: 1;
  color: var(--color-text-muted);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.row-entry .rm-btn:hover { border-color: #c04040; color: #c04040; }

.ingredient-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .6rem;
  margin-top: .6rem;
  flex-wrap: wrap;
}

.add-row-btn {
  display: inline-flex; align-items: center; gap: .3rem;
  padding: .3rem .7rem; font-size: .75rem; font-weight: 600;
  background: var(--bt-bg); border: 1px solid var(--bt-border);
  border-radius: var(--radius-md); color: var(--bt-text); cursor: pointer;
  transition: background .15s;
}
.add-row-btn:hover { background: var(--bt-border); }

.btn-primary {
  padding: .4rem .9rem; font-size: .8rem; font-weight: 700;
  background: var(--bt-text); border: none; border-radius: var(--radius-md);
  color: #fff; cursor: pointer; white-space: nowrap;
  transition: opacity .15s;
}
.btn-primary:hover { opacity: .85; }

.copy-msg {
  font-size: .76rem; color: var(--bt-text); font-weight: 600;
}

/* ---- Bake adjustment ---- */
.bake-note {
  font-size: .82rem; color: var(--color-text-secondary);
  line-height: 1.6; margin: 0 0 .4rem;
}
.bake-note:last-child { margin-bottom: 0; }
.bake-note--ok { color: var(--bt-text); font-weight: 600; }

@media (max-width: 760px) {
  .pan-cards { grid-template-columns: 1fr; }
  .dim-fields { grid-template-columns: 1fr 1fr; }
  .ingredient-hdr, .ingredient-entry { grid-template-columns: 1.2fr .7fr .6fr .9fr auto; }
}