:root {
  --paper: #eef1ee;
  --sheet: #ffffff;
  --ink: #18262c;
  --ink-2: #4a5a60;
  --ink-3: #7b898e;
  --rule: #d5dcd8;
  --rule-strong: #b4beb9;
  --action: #245f8e;
  --action-ink: #ffffff;
  --danger: #a33a2c;
  --warn: #8a5a00;
  --warn-bg: #fbf1d9;
  --ok: #2f6b3f;
  --c-material: #3e6f91;
  --c-process: #b9821b;
  --c-fastener: #7466a6;
  --c-transport: #4e8a5b;
  --c-overhead: #8b8f8c;
  --c-tooling: #6f7d6a;
  --radius: 6px;
  --font: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-head: "Barlow Semi Condensed", "Barlow", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121a1d; --sheet: #1a2428; --ink: #e3eae7; --ink-2: #aab7b3; --ink-3: #7d8c88;
    --rule: #2c393d; --rule-strong: #3d4c50; --action: #5d9fd1; --action-ink: #0b1418;
    --danger: #e0806f; --warn: #e8bf6a; --warn-bg: #302712; --ok: #7cc28e;
    --c-material: #6fa2c6; --c-process: #ddae4f; --c-fastener: #a497d6; --c-transport: #7fbd8b;
    --c-overhead: #9ba19e; --c-tooling: #9fae99;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121a1d; --sheet: #1a2428; --ink: #e3eae7; --ink-2: #aab7b3; --ink-3: #7d8c88;
  --rule: #2c393d; --rule-strong: #3d4c50; --action: #5d9fd1; --action-ink: #0b1418;
  --danger: #e0806f; --warn: #e8bf6a; --warn-bg: #302712; --ok: #7cc28e;
  --c-material: #6fa2c6; --c-process: #ddae4f; --c-fastener: #a497d6; --c-transport: #7fbd8b;
  --c-overhead: #9ba19e; --c-tooling: #9fae99;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[x-cloak] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 15px; line-height: 1.45;
  font-variant-numeric: tabular-nums;
}
h1, h2, h3 { font-family: var(--font-head); font-weight: 600; line-height: 1.15; margin: 0; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .6rem; max-width: 72ch; }
a { color: var(--action); }
small, .muted { color: var(--ink-3); }
.num { font-family: var(--font-head); font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 210px 1fr; min-height: 100vh; }
.side { background: var(--ink); color: #dfe7e4; padding: 18px 12px; display: flex; flex-direction: column; gap: 2px; position: sticky; top: 0; height: 100vh; }
:root[data-theme="dark"] .side { background: #0c1316; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .side { background: #0c1316; } }
.brand { font-family: var(--font-head); font-size: 1.15rem; font-weight: 600; padding: 4px 10px 16px; color: #fff; }
.brand span { display: block; font-size: .8rem; font-weight: 400; color: #9fb1ab; }
.side a { color: #cbd6d2; text-decoration: none; padding: 7px 10px; border-radius: var(--radius); }
.side a:hover { background: rgba(255,255,255,.07); color: #fff; }
.side a.on { background: rgba(255,255,255,.12); color: #fff; }
.side .grow { flex: 1; }
.side .who { font-size: .85rem; color: #9fb1ab; padding: 8px 10px; }
.side .who button { background: none; border: 0; color: #cbd6d2; padding: 0; text-decoration: underline; cursor: pointer; font: inherit; }
.frozen-tag { margin: 6px 10px; padding: 6px 8px; border-radius: var(--radius); background: #3a5a7a; color: #fff; font-size: .82rem; }
main { padding: 24px 32px 64px; min-width: 0; }
.page-head { display: flex; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.page-head .grow { flex: 1; }
.page-head p { margin: 4px 0 0; color: var(--ink-2); }

@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .side { position: static; height: auto; flex-direction: row; flex-wrap: wrap; padding: 10px; gap: 4px; }
  .brand { width: 100%; padding: 2px 6px 6px; }
  .side .grow { display: none; }
  main { padding: 16px; }
}

/* ---------- controls ---------- */
button, .btn {
  font: inherit; border: 1px solid var(--rule-strong); background: var(--sheet); color: var(--ink);
  border-radius: var(--radius); padding: 6px 12px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px;
}
button:hover, .btn:hover { border-color: var(--ink-3); }
button.primary, .btn.primary { background: var(--action); border-color: var(--action); color: var(--action-ink); font-weight: 600; }
button.danger { color: var(--danger); }
button.link { border: 0; background: none; color: var(--action); padding: 2px 4px; }
button:disabled { opacity: .5; cursor: default; }
:focus-visible { outline: 2px solid var(--action); outline-offset: 2px; }
input, select, textarea {
  font: inherit; color: var(--ink); background: var(--sheet); border: 1px solid var(--rule-strong);
  border-radius: var(--radius); padding: 5px 8px; min-width: 0;
}
input[type="number"] { text-align: right; font-variant-numeric: tabular-nums; }
textarea { width: 100%; min-height: 60px; }
label.field { display: flex; flex-direction: column; gap: 3px; font-size: .85rem; color: var(--ink-2); }
label.field > input, label.field > select, label.field > textarea { font-size: .95rem; }
label.check { display: inline-flex; align-items: center; gap: 6px; font-size: .9rem; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.grid-form { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px 14px; }

/* ---------- panels & tables ---------- */
.panel { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 18px; }
.panel > h2 { margin-bottom: 10px; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; font-weight: 600; color: var(--ink-2); font-size: .85rem; border-bottom: 1px solid var(--rule-strong); padding: 6px 8px; }
td { border-bottom: 1px solid var(--rule); padding: 6px 8px; vertical-align: top; }
tr.click { cursor: pointer; }
tr.click:hover td { background: color-mix(in srgb, var(--action) 6%, transparent); }
tr.group td { background: color-mix(in srgb, var(--ink) 5%, var(--sheet)); font-weight: 600; font-family: var(--font-head); }
tr.sub td { font-weight: 600; color: var(--ink-2); }
.table-wrap { overflow-x: auto; }
.empty { padding: 28px; text-align: center; color: var(--ink-2); }
.pill { display: inline-block; font-size: .78rem; padding: 1px 7px; border-radius: 99px; border: 1px solid var(--rule-strong); color: var(--ink-2); white-space: nowrap; }
.pill.final { border-color: var(--ok); color: var(--ok); }
.pill.checked { border-color: var(--action); color: var(--action); }
.pill.warn { border-color: var(--warn); color: var(--warn); background: var(--warn-bg); }
.warnings { background: var(--warn-bg); color: var(--warn); border-radius: var(--radius); padding: 8px 12px; margin: 0; list-style: none; font-size: .9rem; }
.warnings li + li { margin-top: 4px; }
.error-text { color: var(--danger); font-size: .88rem; }
.toast { position: fixed; bottom: 20px; right: 20px; background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: var(--radius); z-index: 50; max-width: 420px; }
.toast.bad { background: var(--danger); color: #fff; }

/* ---------- dashboard ---------- */
.headline { display: flex; gap: 40px; flex-wrap: wrap; align-items: baseline; margin-bottom: 20px; }
.headline .big { font-family: var(--font-head); font-size: 3rem; font-weight: 600; line-height: 1; }
.headline .big small { font-size: 1.1rem; color: var(--ink-2); font-weight: 400; margin-left: 6px; }
.bar { display: flex; height: 14px; border-radius: 3px; overflow: hidden; background: var(--rule); }
.bar > span { display: block; height: 100%; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: .85rem; color: var(--ink-2); margin-top: 8px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }
.hbar { height: 8px; background: var(--c-material); border-radius: 2px; min-width: 2px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 1000px) { .two-col { grid-template-columns: 1fr; } }

/* ---------- part editor: the route card ---------- */
.editor { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 22px; align-items: start; }
@media (max-width: 1100px) { .editor { grid-template-columns: 1fr; } }
.route { list-style: none; margin: 0; padding: 0; position: relative; }
.step {
  position: relative; display: grid; grid-template-columns: 28px minmax(0, 1fr) 170px; gap: 12px;
  padding: 12px 0; border-bottom: 1px solid var(--rule);
}
.step .node { position: relative; display: flex; justify-content: center; }
.step .node::before { content: ""; position: absolute; top: -12px; bottom: -13px; width: 2px; background: var(--rule-strong); }
.route .step:first-child .node::before { top: 14px; }
.route .step:last-child .node::before { bottom: calc(100% - 14px); }
.step .node b {
  position: relative; width: 24px; height: 24px; border-radius: 50%; background: var(--sheet);
  border: 3px solid var(--cat); font-size: .72rem; display: grid; place-items: center; color: var(--ink-2);
}
.step .what { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.step .what .title { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.step .what .title strong { color: var(--cat); font-family: var(--font-head); font-weight: 600; }
.step .what .inputs { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.step .what .inputs label.field input[type="number"] { width: 92px; }
.step .what .inputs select { max-width: 340px; }
.step .formula { font-size: .82rem; color: var(--ink-3); overflow-wrap: anywhere; }
.step .kg { text-align: right; font-family: var(--font-head); font-size: 1.1rem; }
.step .kg small { display: block; font-family: var(--font); font-size: .75rem; }
.step .tools { display: flex; gap: 2px; justify-content: flex-end; margin-top: 6px; }
.step .tools button { padding: 0 6px; font-size: .8rem; border-color: transparent; color: var(--ink-3); background: none; }
.step .tools button:hover { color: var(--ink); border-color: var(--rule-strong); }
.step.ignored { opacity: .5; }
@media (max-width: 640px) {
  .grid-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-form input, .grid-form select { width: 100%; }
  .grid-form > * { grid-column: auto !important; }
  .grid-form > .field:has(textarea) { grid-column: 1 / -1 !important; }
  .step { grid-template-columns: 24px minmax(0, 1fr); gap: 10px; }
  .step > div:last-child { grid-column: 2; display: flex; justify-content: space-between; align-items: center; }
  .step .kg { text-align: left; }
  .step .tools { margin-top: 0; }
  .add-step { padding-left: 0; }
  .page-head { gap: 8px; }
  .panel { padding: 12px; }
}
.cat-material { --cat: var(--c-material); }
.cat-process { --cat: var(--c-process); }
.cat-fastener { --cat: var(--c-fastener); }
.cat-transport { --cat: var(--c-transport); }
.cat-overhead { --cat: var(--c-overhead); }
.cat-tooling { --cat: var(--c-tooling); }
.add-step { display: flex; gap: 6px; flex-wrap: wrap; padding: 14px 0 0 40px; }
.add-step button { font-size: .88rem; border-left: 4px solid var(--cat); }

.rail { position: sticky; top: 18px; }
.rail .total { font-family: var(--font-head); font-size: 2.6rem; font-weight: 600; line-height: 1; }
.rail .total small { font-size: 1rem; color: var(--ink-2); font-weight: 400; }
.carbon-column { display: flex; flex-direction: column-reverse; height: 240px; width: 46px; background: var(--rule); border-radius: 4px; overflow: hidden; }
.carbon-column > span { display: block; width: 100%; transition: height .35s ease; }
@media (prefers-reduced-motion: reduce) { .carbon-column > span { transition: none; } }
.rail-body { display: grid; grid-template-columns: 46px 1fr; gap: 14px; margin: 14px 0; }
.rail-body dl { margin: 0; display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; font-size: .9rem; align-content: end; }
.rail-body dt i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 6px; }
.rail-body dd { margin: 0; text-align: right; font-family: var(--font-head); }

/* ---------- dialogs ---------- */
dialog { border: 1px solid var(--rule-strong); border-radius: 8px; padding: 0; background: var(--sheet); color: var(--ink); width: min(640px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(15, 25, 28, .45); }
dialog > form, dialog .dlg { padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; }
dialog .dlg > form.row { flex-wrap: nowrap; }
dialog .actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 4px; }
.search-results { max-height: 340px; overflow: auto; border: 1px solid var(--rule); border-radius: var(--radius); }
.search-results td { font-size: .9rem; }

/* ---------- login ---------- */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login form { background: var(--sheet); border: 1px solid var(--rule); border-radius: 8px; padding: 26px; width: min(380px, 100%); display: flex; flex-direction: column; gap: 14px; }
.login h1 { font-size: 1.5rem; }