: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 { max-width: 1100px; 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 ---- */
.app-wrap {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}
.pane-in {
  width: 340px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.pane-out {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: 1rem;
}

.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); }

.two-col { display: flex; gap: .6rem; }
.two-col .field { flex: 1; margin-bottom: 0; }

.in-row { display: flex; gap: .5rem; align-items: center; }
.in-row input { flex: 1; }
.in-row .unit-lbl { font-size: .78rem; color: var(--color-text-muted); white-space: nowrap; min-width: 26px; }

.slider-row { display: flex; align-items: center; gap: .5rem; }
.slider-row input[type=range] { flex: 1; accent-color: var(--bt-mid); height: 4px; }
.slider-val { font-size: .75rem; font-weight: 700; color: var(--bt-text); min-width: 44px; text-align: right; }

/* toggle (unit + run direction) */
.seg-toggle {
  display: flex; border: 1.5px solid var(--bt-border);
  border-radius: var(--radius-md); overflow: hidden;
}
.seg-toggle button {
  flex: 1; padding: .35rem .5rem; font-size: .74rem; font-weight: 600;
  background: none; border: none; cursor: pointer; color: var(--color-text-muted);
  transition: background .15s, color .15s;
}
.seg-toggle button.active { background: var(--bt-bg); color: var(--bt-text); }

.btn-primary {
  padding: .45rem .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; }
.btn-primary.copied { background: #1a7a2e; }

/* ---- RESULT STATS ---- */
.stats-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem;
}
.stat-cell {
  background: var(--bt-bg); border: 1px solid var(--bt-border);
  border-radius: var(--radius-md); padding: .6rem .65rem;
}
.stat-cell.hero-stat { grid-column: span 3; background: var(--bt-text); border-color: var(--bt-text); }
.stat-cell.hero-stat .stat-lbl { color: #f3e6b8; }
.stat-cell.hero-stat .stat-val { color: #fff; font-size: 2rem; }
.stat-cell.hero-stat .stat-sub { color: #f3e6b8; }
.stat-lbl { font-size: .64rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--color-text-muted); margin-bottom: .15rem; }
.stat-val { font-size: 1.35rem; font-weight: 800; color: var(--bt-dark); line-height: 1.1; }
.stat-val.sm { font-size: 1.05rem; }
.stat-sub { font-size: .65rem; color: var(--color-text-muted); margin-top: .15rem; }

/* ---- BOARDS BY STOCK TABLE ---- */
.stock-table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.stock-table th, .stock-table td { text-align: left; padding: .4rem .5rem; border-bottom: 1px dashed var(--color-border); }
.stock-table th { font-size: .64rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); font-weight: 700; }
.stock-table td.num { text-align: right; font-weight: 700; color: var(--bt-text); }
.stock-table tr.primary-row { background: var(--bt-bg); }
.stock-table tr.primary-row td { font-weight: 800; }

/* ---- COST ---- */
.cost-grid { display: flex; flex-direction: column; gap: .2rem; }
.cost-row {
  display: flex; justify-content: space-between; font-size: .82rem;
  padding: .25rem 0; border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}
.cost-row:last-child { border-bottom: none; }
.cost-row.total { font-weight: 800; color: var(--bt-text); font-size: .95rem; border-top: 1.5px solid var(--bt-border); }

/* ---- DECK PREVIEW ---- */
.deck-preview-wrap { width: 100%; overflow: hidden; border-radius: var(--radius-md); }
.deck-preview-wrap svg { width: 100%; height: auto; display: block; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.preview-caption { font-size: .7rem; color: var(--color-text-muted); margin: .5rem 0 0; text-align: center; }

/* ---- LEARN MORE ---- */
.learn-more{max-width:820px;margin:1.25rem auto 0;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:1.1rem 1.5rem}
.learn-more-title{font-size:1.1rem;font-weight:800;color:var(--bt-text);margin:0 0 .75rem}
.learn-more h3{font-size:1rem;font-weight:800;color:var(--color-text-primary);margin:1.1rem 0 .5rem}
.learn-more p{font-size:.88rem;line-height:1.65;color:var(--color-text-secondary);margin:0 0 .75rem}
.learn-more a{color:var(--bt-text)}
.learn-more .faq-item{margin-bottom:.75rem}
.learn-more .faq-q{font-size:.88rem;font-weight:700;color:var(--color-text-primary);margin:0 0 .25rem}
.learn-more-meta{font-size:.72rem;color:var(--color-text-muted);margin-top:1rem}

@media (max-width: 820px) {
  .app-wrap { flex-direction: column; }
  .pane-in { width: 100%; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-cell.hero-stat { grid-column: span 2; }
}