*, *::before, *::after { box-sizing: border-box; }
:root {
  --bg: #F4F4F1;
  --white: #FFFFFF;
  --navy: #18243A;
  --amber: #E8A21A;
  --amber-pale: #FFFBF0;
  --text: #111827;
  --text-mid: #374151;
  --text-soft: #6B7280;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --green: #16A34A;
}
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
body {
  margin: 0;
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
.header {
  background: var(--navy);
  padding: calc(28px + env(safe-area-inset-top, 0px)) max(24px, env(safe-area-inset-right)) 36px max(24px, env(safe-area-inset-left));
}
.brand { font-size: 1.4rem; font-weight: 700; color: #fff; }
.tagline { font-size: 0.8125rem; color: rgba(255,255,255,0.65); margin-top: 5px; }
.main { max-width: 640px; margin: auto; padding: 28px max(16px, env(safe-area-inset-right)) calc(80px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left)); }
.back { display: inline-block; margin-bottom: 24px; color: var(--text-mid); font-weight: 600; text-decoration: none; }
.back:hover, .back:focus-visible { text-decoration: underline; }
.block { margin-bottom: 28px; }
.label { font-size: 0.875rem; font-weight: 600; color: var(--text-mid); margin: 0 0 12px; padding-left: 10px; border-left: 3px solid var(--amber); }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.prod-card {
  display: block;
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}
.prod-card[href]:hover, .prod-card[href]:focus-visible { border-color: var(--pcolor, var(--amber)); }
.prod-card.disabled { opacity: 0.56; }
.prod-dot { display: block; width: 9px; height: 9px; border-radius: 50%; background: var(--pcolor, var(--amber)); margin-bottom: 10px; }
.prod-name { display: block; font-size: 0.875rem; font-weight: 600; line-height: 1.3; overflow-wrap: anywhere; }
.prod-sub { display: block; font-size: 0.75rem; color: var(--text-soft); margin-top: 3px; }
.prod-badge { display: inline-block; margin-top: 10px; font-size: 0.6875rem; font-weight: 600; color: var(--text-mid); }

/* Catalogo escalable (1 a 100+ formulas) */
.catalog-toolbar {
  margin-bottom: 20px;
}
.catalog-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}
.catalog-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-mid);
  margin: 0;
  padding-left: 10px;
  border-left: 3px solid var(--amber);
}
.catalog-count {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--white);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 12px;
}
.search-wrap {
  position: relative;
  margin-bottom: 12px;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-soft);
  pointer-events: none;
  display: flex;
  align-items: center;
  width: 18px;
  height: 18px;
}
.search-input {
  width: 100%;
  padding: 13px 40px 13px 42px;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.search-input:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(232, 162, 26, 0.14);
}
.search-input::placeholder {
  color: var(--text-soft);
  font-size: 0.875rem;
}
.search-clear {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-soft);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  display: none;
  line-height: 1;
}
.search-clear:hover {
  color: var(--text);
  background: var(--border-light);
}
.filter-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 8px 2px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.filter-bar::-webkit-scrollbar {
  display: none;
}
.filter-chip {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--text-mid);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
  flex-shrink: 0;
}
.filter-chip:hover {
  border-color: var(--text-soft);
}
.filter-chip.active {
  background: var(--navy);
  color: #FFFFFF;
  border-color: var(--navy);
  font-weight: 600;
}

.formula-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.formula-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}
.formula-row[href]:hover, .formula-row[href]:focus-visible {
  border-color: var(--pcolor, var(--amber));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.formula-row[href]:active {
  transform: translateY(0);
}
.formula-row.disabled {
  opacity: 0.58;
  cursor: default;
  background: var(--white);
}
.formula-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex: 1;
}
.formula-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pcolor, var(--amber));
  flex-shrink: 0;
}
.formula-info {
  min-width: 0;
  flex: 1;
}
.formula-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}
.formula-category {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-soft);
}
.formula-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  overflow-wrap: anywhere;
}
.formula-desc {
  font-size: 0.8125rem;
  color: var(--text-soft);
  margin-top: 2px;
  overflow-wrap: anywhere;
}
.formula-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-left: 12px;
}
.badge-ready {
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 12px;
  background: #DCFCE7;
  color: #15803D;
  white-space: nowrap;
}
.badge-soon {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 12px;
  background: var(--border-light);
  color: var(--text-soft);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.formula-arrow {
  color: var(--text-soft);
  display: flex;
  align-items: center;
  transition: transform 0.15s ease, color 0.15s ease;
}
.formula-row[href]:hover .formula-arrow {
  color: var(--pcolor, var(--amber));
  transform: translateX(3px);
}
.catalog-empty {
  text-align: center;
  padding: 36px 16px;
  background: var(--white);
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  color: var(--text-soft);
}
.catalog-empty-icon {
  font-size: 2rem;
  margin-bottom: 6px;
}
.catalog-empty-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.catalog-empty-sub {
  font-size: 0.8125rem;
}

.vol-wrap { background: var(--white); border: 2px solid var(--border); border-radius: 8px; display: flex; align-items: center; overflow: hidden; }
.vol-wrap:focus-within { border-color: var(--amber); }
.vol-btn { width: 56px; height: 60px; font-size: 1.5rem; color: var(--text-mid); background: none; border: none; cursor: pointer; flex-shrink: 0; font-family: inherit; }
.vol-input { flex: 1; min-width: 0; text-align: center; font-size: 2.25rem; font-weight: 700; font-family: inherit; color: var(--text); border: none; outline: none; background: none; padding: 12px 4px; appearance: textfield; }
.vol-input::-webkit-outer-spin-button, .vol-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.vol-unit { color: var(--text-soft); padding-right: 20px; flex-shrink: 0; }
.presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.pre-btn { padding: 6px 14px; border-radius: 20px; border: 1.5px solid var(--border); background: var(--white); color: var(--text-mid); cursor: pointer; font: inherit; font-size: 0.8125rem; }
.pre-btn.on, .pre-btn:hover { border-color: var(--amber); color: #96680E; background: var(--amber-pale); }
#resultsBlock { display: none; }
.sep { height: 1px; background: var(--border); margin: 24px 0; }
.summary-banner { background: var(--white); border: 1.5px solid var(--border); border-radius: 8px; padding: 14px 16px; margin-bottom: 24px; font-size: 0.9375rem; color: var(--text-mid); }
.summary-banner strong { color: var(--text); }
.safety-box { background: #FEF2F2; border: 1.5px solid #FECACA; border-radius: 8px; padding: 16px 18px; }
.safety-title { font-size: 0.8125rem; font-weight: 700; color: #B91C1C; margin-bottom: 12px; }
.safety-items { display: flex; flex-direction: column; gap: 9px; }
.safety-item { display: flex; align-items: center; gap: 10px; font-size: 0.9375rem; color: var(--text-mid); cursor: pointer; }
.safety-item input { width: 18px; height: 18px; accent-color: #B91C1C; margin: 0; flex-shrink: 0; }
.safety-item input:checked + span { color: var(--green); font-weight: 600; }
.tbl { background: var(--white); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.tbl-head { display: flex; justify-content: space-between; padding: 9px 16px; background: var(--navy); }
.tbl-head span { font-size: 0.6875rem; font-weight: 600; color: rgba(255,255,255,0.7); text-transform: uppercase; }
.tbl-row { display: flex; align-items: center; justify-content: space-between; padding: 13px 16px; border-bottom: 1px solid var(--border-light); gap: 12px; }
.tbl-row:last-child { border-bottom: none; }
.tbl-row.highlight { background: var(--amber-pale); }
.tbl-row-left { flex: 1; min-width: 0; }
.tbl-name { font-size: 0.9375rem; font-weight: 500; overflow-wrap: anywhere; }
.tbl-sub { font-size: 0.75rem; color: var(--text-soft); margin-top: 2px; }
.tbl-right { flex-shrink: 0; text-align: right; }
.tbl-amount { font-size: 1rem; font-weight: 700; color: var(--text); white-space: nowrap; }
.step { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.step:last-child { border-bottom: none; }
.step-n { font-size: 1.375rem; font-weight: 700; color: var(--amber); flex-shrink: 0; width: 32px; }
.step-body { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.step-text { font-size: 0.9375rem; line-height: 1.6; }
.step-text strong { color: var(--text); }
.step-tip { margin-top: 10px; font-size: 0.8125rem; color: #7A5510; background: var(--amber-pale); border-left: 3px solid var(--amber); padding: 8px 12px; line-height: 1.5; }
.yield { background: var(--navy); border-radius: 8px; padding: 22px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 24px; }
.yield-label { font-size: 0.75rem; color: rgba(255,255,255,0.7); margin-bottom: 4px; }
.yield-val { font-size: 2rem; font-weight: 700; color: #fff; }
.yield-sub { font-size: 0.75rem; color: rgba(255,255,255,0.65); }
@media (max-width: 420px) {
  .product-grid, .yield { grid-template-columns: 1fr; }
  .vol-btn { width: 48px; }
  .vol-input { font-size: 1.75rem; }
  .vol-unit { padding-right: 8px; }
  .tbl-row { flex-direction: column; align-items: stretch; gap: 6px; }
  .tbl-right { align-self: flex-end; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --white: #1F2937;
    --text: #F9FAFB;
    --text-mid: #D1D5DB;
    --text-soft: #9CA3AF;
    --border: #374151;
    --border-light: #2D3748;
    --amber-pale: rgba(232,162,26,0.08);
  }
  .step-tip { color: #E8A21A; }
  .safety-box { background: rgba(185,28,28,0.12); }
  .pre-btn.on { color: var(--amber); }
  .badge-ready { background: rgba(22, 163, 74, 0.22); color: #4ADE80; }
  .badge-soon { background: rgba(255, 255, 255, 0.06); color: var(--text-soft); border-color: var(--border); }
  .filter-chip.active { background: var(--amber); color: #111827; border-color: var(--amber); }
  .catalog-count { background: rgba(255, 255, 255, 0.05); }
}