:root {
  --green: #2e6f3e;
  --green-dk: #1f4e2b;
  --green-lt: #e7f1e9;
  --amber: #b45309;
  --amber-bg: #fef3c7;
  --ink: #1c2620;
  --muted: #5b6b60;
  --line: #d7e0d9;
  --bg: #f6f8f6;
  --adj: #2563eb;
  --head: #3d4f5d;
  --head-lt: #eaeef1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(46, 111, 62, .15);
}

header {
  background: var(--green-dk);
  color: #fff;
  padding: 18px 20px;
}
header h1 { margin: 0 0 4px; font-size: 1.5rem; }
header .sub { margin: 0; font-size: .9rem; color: #cfe3d3; max-width: 70ch; }
header .title-row { display: flex; align-items: center; gap: 14px; max-width: 880px; margin: 0 auto; }
header .title-icon { flex-shrink: 0; background: #fff; border-radius: 10px; padding: 4px; }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 18px 16px 40px;
  display: grid;
  gap: 16px;
}

.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}
.panel h2 {
  margin: 0 0 12px;
  font-size: 1rem;
  color: var(--green-dk);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.panel-head h2 { margin: 0; }
.copy-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.scheme-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  padding: 10px 12px;
  background: var(--green-lt);
  border: 1px solid #bcd4c2;
  border-radius: 10px;
}
.scheme-label { font-size: .85rem; font-weight: 700; color: var(--green-dk); }
.scheme-opt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
}
.scheme-opt small { font-weight: 400; color: var(--muted); }
.scheme-opt input { accent-color: var(--green); width: 17px; height: 17px; }

.copy-btn {
  border: 1.5px solid var(--green);
  color: var(--green);
  background: #fff;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.copy-btn:hover { background: var(--green-lt); }
.copy-btn.done { background: var(--green); color: #fff; border-color: var(--green); }

.link-btn {
  border: none;
  background: none;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
  padding: 6px 4px;
}
.link-btn:hover { color: var(--green-dk); }

/* search */
.search-wrap { position: relative; }
#search {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border: 2px solid var(--line);
  border-radius: 10px;
  outline: none;
}
#search:focus { border-color: var(--green); }

.suggestions {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  position: absolute;
  z-index: 10;
  width: 100%;
  max-height: 320px;
  overflow-y: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
.suggestions:empty { display: none; }
.suggestions li {
  padding: 10px 14px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  border-bottom: 1px solid var(--bg);
}
.suggestions li:hover { background: var(--green-lt); }
.s-name { font-weight: 600; }
.s-meta { font-size: .8rem; color: var(--muted); text-align: right; }
.s-meta b { color: var(--green); }

/* adjuvant bar */
.adj-row { display: flex; align-items: center; gap: 10px; margin: 14px 0 4px; flex-wrap: wrap; }
.adj-label { font-size: .85rem; color: var(--muted); font-weight: 600; }
.adj-bar { display: flex; gap: 6px; flex-wrap: wrap; }
.adj-btn {
  border: 1.5px solid var(--adj);
  color: var(--adj);
  background: #fff;
  border-radius: 999px;
  padding: 5px 12px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
}
.adj-btn:hover { background: #eff5ff; }

/* custom product */
.custom-wrap { margin-top: 10px; }
.custom-form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}
.custom-form input, .custom-form select {
  padding: 10px 12px;
  font-size: 1rem;
  border: 1.5px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.custom-form input { flex: 1 1 180px; }
.custom-form input:focus, .custom-form select:focus { outline: none; border-color: var(--green); }
.custom-form select { flex: 1 1 220px; }

.s-custom { color: var(--green-dk); }
.s-custom:hover { background: var(--green-lt); }

/* chips */
.selected-box {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  margin: 14px 0;
  background: #fbfdfb;
}
.selected-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.selected-head h3 {
  margin: 0;
  font-size: .8rem;
  color: var(--green-dk);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.product-rows { display: flex; flex-direction: column; gap: 8px; }
.empty { color: var(--muted); font-style: italic; margin: 6px 0; }
.product-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  background: var(--green-lt);
  border: 1px solid #bcd4c2;
  border-radius: 10px;
  color: var(--green-dk);
}
.product-row.product-row-adj { background: #eef4ff; border-color: #bfd3f5; color: #1e3a8a; }
.product-row .pr-name { font-size: .92rem; font-weight: 700; line-height: 1.2; min-width: 0; }
.product-row .pr-name small { font-weight: 700; opacity: .7; font-size: .72rem; margin-left: 6px; }
.product-row .pr-rate {
  width: 78px; padding: 6px 8px; text-align: right;
  border: 1px solid var(--line); border-radius: 6px;
  font-size: .92rem; background: #fff; color: var(--text);
}
.product-row .pr-rate:focus { outline: none; border-color: var(--green); }
.product-row .pr-unit {
  padding: 6px 22px 6px 8px; border: 1px solid var(--line); border-radius: 6px;
  font-size: .85rem; background: #fff; color: var(--text); max-width: 110px;
}
.product-row .pr-unit:focus { outline: none; border-color: var(--green); }
.product-row .pr-remove {
  border: none; background: rgba(0,0,0,.08); color: inherit;
  border-radius: 50%; width: 26px; height: 26px;
  cursor: pointer; font-size: 1.05rem; line-height: 1;
}
.product-row .pr-remove:hover { background: rgba(0,0,0,.18); }
.product-row .pr-hint {
  grid-column: 1 / -1;
  font-size: .76rem; color: var(--muted); opacity: .85;
  margin: -2px 0 0 2px;
}
.product-row .pr-hint b { color: var(--green-dk); font-weight: 600; }

/* inline batch (tank size + GPA) sits below the selected products */
.batch-inline {
  display: flex; flex-wrap: wrap; gap: 12px 16px;
  align-items: end; margin-top: 14px; padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.batch-inline-field { flex: 0 1 160px; }
.batch-inline-field label {
  display: block; font-size: .72rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: .04em; margin-bottom: 4px;
}
.optional-tag {
  font-size: .65rem; font-weight: 600; text-transform: none;
  letter-spacing: 0; color: var(--muted);
  background: rgba(0,0,0,.05); border-radius: 4px;
  padding: 1px 5px; margin-left: 4px; vertical-align: middle;
}
.batch-inline-field input[type=number] {
  width: 100%; padding: 8px 10px; border: 1.5px solid var(--line);
  border-radius: 8px; background: #fff; font-size: .95rem;
}
.batch-inline-field input[type=number]:focus { outline: none; border-color: var(--green); }
.batch-inline-stats {
  display: flex; gap: 18px; margin-left: auto;
  padding: 4px 10px;
}
.batch-inline-stats > span { display: flex; flex-direction: column; align-items: flex-end; }
.batch-inline-stats b { font-size: 1.05rem; color: var(--green); font-variant-numeric: tabular-nums; }
.batch-inline-stats small { font-size: .68rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }

@media (max-width: 600px) {
  .product-row { grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 6px 8px; }
  .product-row .pr-name { grid-column: 1; grid-row: 1; }
  .product-row .pr-remove { grid-column: 2; grid-row: 1; justify-self: end; }
  .product-row .pr-rate { grid-column: 1; grid-row: 2; width: 100%; box-sizing: border-box; }
  .product-row .pr-unit { grid-column: 2; grid-row: 2; max-width: 130px; box-sizing: border-box; }
  .product-row .pr-hint { grid-column: 1 / -1; grid-row: 3; }
  .batch-inline-stats { width: 100%; margin-left: 0; justify-content: space-between; }
}

/* output steps */
.output:empty::after {
  content: "Add products above to see the recommended add-order.";
  color: var(--muted);
  font-style: italic;
}
.warnings {
  background: var(--amber-bg);
  border: 1px solid #fcd34d;
  border-radius: 10px;
  padding: 4px 14px;
  margin-bottom: 14px;
}
.warnings p { margin: 10px 0; color: #7c2d12; font-size: .9rem; }

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; }
.steps .step, .steps .step-water {
  counter-increment: step;
  position: relative;
  padding: 10px 12px 10px 46px;
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 8px;
  background: #fff;
}
.steps .step::before, .steps .step-water::before {
  content: counter(step);
  position: absolute;
  left: 10px; top: 10px;
  width: 26px; height: 26px;
  background: var(--green);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: .82rem;
  font-weight: 700;
}
.step-water { background: var(--green-lt); border-color: #bcd4c2; }
.step-adj { background: #f5f9ff; }
.step .nm { font-weight: 600; }
.step .tag {
  display: inline-block;
  margin-left: 8px;
  font-size: .72rem;
  font-weight: 700;
  color: var(--green);
  background: var(--green-lt);
  border-radius: 6px;
  padding: 1px 7px;
}
.step-adj .tag { color: var(--adj); background: #eef4ff; }
.step .note { display: block; font-size: .82rem; color: var(--amber); margin-top: 3px; }
.step .hint { display: block; font-size: .76rem; color: var(--muted); margin-top: 2px; }
.step .amt {
  display: inline-block; margin-left: 8px;
  font-size: .82rem; color: var(--green-dk);
  background: var(--green-lt); border: 1px solid #bcd4c2;
  border-radius: 6px; padding: 1px 8px;
  font-variant-numeric: tabular-nums;
  vertical-align: middle;
}
.step .amt b { font-weight: 700; }
.step .amt .amt-sub { display: block; font-size: .72rem; opacity: .8; margin-top: 1px; }

.group-head {
  margin: 16px 0 8px;
  padding: 7px 12px;
  font-weight: 700;
  color: #fff;
  background: var(--head);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
}
.group-head small { font-weight: 500; color: rgba(255,255,255,.78); font-size: .78rem; }

.g-num {
  display: inline-grid;
  place-items: center;
  width: 22px; height: 22px;
  background: rgba(255,255,255,.22);
  color: #fff;
  border-radius: 6px;
  font-size: .8rem;
}

.foot { font-size: .85rem; color: var(--muted); margin: 14px 0 0; }

/* reference */
.ref-list { list-style: none; margin: 0; padding: 0; }
.ref-list li {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid var(--bg);
  font-weight: 600;
}
.ref-list small { font-weight: 400; color: var(--muted); }
.ref-note { font-size: .85rem; color: var(--muted); margin: 12px 0 0; }
.ref-toggle-row { display: flex; align-items: center; }
.ref-toggle-row .link-btn { font-weight: 600; }
.ref-toggle-row .link-btn::before {
  content: "▸"; margin-right: 6px;
  display: inline-block; transition: transform .12s ease;
}
.ref-toggle-row .link-btn[aria-expanded="true"]::before { transform: rotate(90deg); }

/* saved mixes */
.saved-panel .panel-head { align-items: center; }
.save-row { display: flex; gap: 8px; align-items: center; margin: 8px 0 0; }
.save-row input {
  flex: 1 1 auto; min-width: 0;
  padding: 10px 12px; font-size: 1rem;
  border: 1.5px solid var(--line); border-radius: 8px; background: #fff;
}
.save-row input:focus { outline: none; border-color: var(--green); }
.save-row .copy-btn { flex-shrink: 0; }
.saved-mixes { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.saved-mix {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfdfb;
}
.saved-mix-info { flex: 1; min-width: 0; }
.saved-mix-name { font-weight: 700; }
.saved-mix-meta { font-size: .8rem; color: var(--muted); margin-top: 2px; }
.saved-mix-actions { display: flex; gap: 6px; flex-shrink: 0; }
.saved-mix .load-btn { padding: 6px 12px; font-size: .85rem; }
.saved-mix .del-btn {
  border: none; background: none; color: var(--muted);
  width: 30px; height: 30px; border-radius: 50%;
  cursor: pointer; font-size: 1.1rem; line-height: 1;
}
.saved-mix .del-btn:hover { background: rgba(180,30,30,.12); color: #b41e1e; }
.saved-empty { font-size: .85rem; color: var(--muted); margin: 10px 0 0; }
.saved-empty:has(+ .saved-mixes li),
.saved-mixes:not(:empty) + .saved-empty { display: none; }

footer {
  text-align: center;
  padding: 20px;
  font-size: .78rem;
  color: var(--muted);
}

/* scheme title — hidden on screen, shown in print and image captures */
.print-title { display: none; }
body.capturing .print-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green-dk);
  margin: 0 0 12px;
}

@media print {
  header, footer, .ref, .copy-actions, .scheme-row { display: none !important; }
  /* hide the "Add your products" panel */
  main > section.panel:first-of-type { display: none !important; }

  body { background: #fff; color: #000; }
  main { display: block; max-width: none; margin: 0; padding: 0; }
  .panel { border: none; border-radius: 0; padding: 0; }
  .panel h2 { display: none; }

  .print-title {
    display: block;
    font-size: 1.15rem;
    font-weight: 700;
    color: #000;
    margin: 0 0 14px;
  }

  .steps .step, .steps .step-water, .group-head { break-inside: avoid; }
  .step .hint { color: #555; }
  .steps .step::before, .steps .step-water::before,
  .step-water, .step-adj, .warnings {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}

@media (max-width: 520px) {
  .s-ai { display: none; }            /* keep the formulation code, drop the long AI text */
  header { padding: 16px 14px; }
  header h1 { font-size: 1.25rem; }
  main { padding: 14px 12px 36px; gap: 14px; }
  .panel { padding: 14px; }

  /* larger touch targets */
  #search { padding: 14px; }
  .suggestions li { padding: 14px; }
  .suggestions { max-height: 60vh; }
  .adj-btn { padding: 9px 15px; font-size: .9rem; }
  .copy-btn { padding: 10px 16px; font-size: .9rem; }
  .chip { font-size: .95rem; padding: 7px 8px 7px 14px; }
  .chip button { width: 28px; height: 28px; }
  .steps .step, .steps .step-water { padding: 14px 12px 14px 48px; }
  .custom-form input, .custom-form select, .custom-form .copy-btn { flex-basis: 100%; width: 100%; }
  .save-row { flex-wrap: wrap; }
  .save-row input, .save-row .copy-btn { flex-basis: 100%; }
}