:root {
  --bg: #f6f5f2; --panel: #ffffff; --ink: #1d1d1b; --muted: #6b6a66; --line: #dddbd5;
  --accent: #b5261e; --accent-ink: #ffffff; --ok: #1f7a3f; --warn: #9a5b00; --err: #b3261e;
  --err-bg: #fdeceb; --warn-bg: #fff4e0; --ok-bg: #e9f5ee; --focus: #2563eb;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615; --panel: #20201f; --ink: #ecebe7; --muted: #a3a29c; --line: #3a3936;
    --accent: #e0574e; --accent-ink: #160b0a; --ok: #6fcf93; --warn: #f0b860; --err: #ff8a80;
    --err-bg: #3a1d1b; --warn-bg: #36290f; --ok-bg: #16301f; --focus: #7aa7ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
main { max-width: 980px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.4rem; margin: 8px 0 16px; }
h2 { font-size: 1.1rem; margin: 24px 0 8px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.hidden { display: none !important; }

nav.top { background: var(--panel); border-bottom: 1px solid var(--line); }
nav.top .inner { max-width: 980px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
nav.top .brand { font-weight: 700; margin-right: auto; color: var(--ink); text-decoration: none; }
nav.top a { text-decoration: none; }
nav.top a.active { font-weight: 700; text-decoration: underline; }
nav.top button { font-size: .9rem; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 16px; }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
input, select, textarea, button { font: inherit; color: inherit; }
input, select, textarea { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
textarea { min-height: 70px; resize: vertical; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
button { padding: 9px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); cursor: pointer; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; }
button:disabled { opacity: .5; cursor: not-allowed; }
button.link { border: 0; background: none; color: var(--accent); padding: 0; text-decoration: underline; }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 12px; }
.msg { padding: 10px 12px; border-radius: 8px; margin: 10px 0; }
.msg.err { background: var(--err-bg); color: var(--err); }
.msg.ok { background: var(--ok-bg); color: var(--ok); }
.msg.warn { background: var(--warn-bg); color: var(--warn); }

/* The R&D form lines */
.line { border-top: 1px solid var(--line); padding: 12px 0; }
.line:first-child { border-top: 0; }
.line-inputs { display: grid; gap: 8px; grid-template-columns: 90px 150px 1fr 36px; align-items: start; }
.line-inputs .remove { padding: 8px 0; width: 36px; }
@media (max-width: 640px) {
  .line-inputs { grid-template-columns: 80px 1fr 36px; }
  .line-inputs .item-wrap { grid-column: 1 / -1; grid-row: 2; }
}
.item-wrap { position: relative; }
.suggest { position: absolute; z-index: 5; left: 0; right: 0; top: 100%; margin: 2px 0 0; padding: 0; list-style: none;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; max-height: 280px; overflow-y: auto; box-shadow: 0 6px 18px rgba(0,0,0,.15); }
.suggest li { padding: 8px 10px; cursor: pointer; }
.suggest li[aria-selected="true"], .suggest li:hover { background: var(--bg); }
.suggest .detail { display: block; font-size: .8rem; color: var(--muted); }
.line-result { margin-top: 6px; font-size: .9rem; }
.line-result .cost { font-weight: 700; }
.line-result.err { color: var(--err); }
.badge { display: inline-block; font-size: .75rem; padding: 1px 7px; border-radius: 999px; border: 1px solid currentColor; margin-left: 6px; }
.override { margin-top: 8px; padding: 10px; border-radius: 8px; background: var(--err-bg); }
.override .row { grid-template-columns: 140px 1fr; }
@media (max-width: 640px) { .override .row { grid-template-columns: 1fr; } }
.total { display: flex; justify-content: space-between; font-size: 1.25rem; font-weight: 700; padding-top: 12px; border-top: 2px solid var(--ink); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; white-space: nowrap; }
.table-wrap { overflow-x: auto; }
tr.clickable { cursor: pointer; }
tr.clickable:hover { background: var(--bg); }

.login { max-width: 380px; margin: 10vh auto 0; }

@media print {
  nav.top, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .panel { border: 0; padding: 0; }
  main { max-width: none; padding: 0; }
}