:root {
  --bg: #eef2f6;
  --surface: #ffffff;
  --ink: #15233b;
  --ink-2: #4a5a72;
  --ink-3: #75839a;
  --line: #d3dce7;
  --line-2: #e6ecf2;
  --brand: #255188;
  --brand-ink: #1b3e6b;
  --brand-tint: #e5edf7;
  --leaf: #8dc63f;
  --leaf-ink: #4e7a12;
  --error: #b83a2e;
  --error-tint: #fbecea;
  --warn: #9a6200;
  --warn-tint: #fff4dc;
  /* chromatogram base colours */
  --A: #2e9a4b;
  --C: #2563c9;
  --G: #1f2530;
  --T: #d23c32;
  --N: #8a94a6;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --r-s: 6px;
  --r-m: 10px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 15px/1.5 var(--sans);
  padding-bottom: 96px;
}
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }

a { color: var(--brand); }
:focus-visible { outline: 3px solid var(--leaf); outline-offset: 2px; }
.sr, .hp { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.hp { left: -9999px; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }
[hidden] { display: none !important; }

/* ---------- top bar */
.topbar { background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 72px; flex-wrap: wrap; }
.brand img { display: block; height: 46px; width: auto; }
.toplinks { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.toplinks > a { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.toplinks > a:hover { color: var(--brand); text-decoration: underline; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 2px; }
.lang button { border: 0; background: none; font: 600 13px var(--sans); color: var(--ink-2); padding: 4px 10px; border-radius: 999px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--brand); color: #fff; }

/* ---------- intro with chromatogram trace */
.intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 40px; align-items: end; padding-top: 44px; padding-bottom: 28px; }
.intro h1 { font-size: 40px; line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 14px; font-weight: 700; color: var(--brand-ink); }
.intro p { margin: 0; color: var(--ink-2); max-width: 58ch; font-size: 16px; }
.trace { margin: 0; }
.trace svg { display: block; width: 100%; height: 96px; }
.trace path { fill: none; stroke-width: 1.6; stroke-linejoin: round; }
.trace-seq { display: flex; justify-content: space-between; font: 600 15px var(--mono); border-top: 1px solid var(--line); padding-top: 6px; }
.trace-seq b { font-weight: 600; }
.trace-seq .end { color: var(--ink-3); font-weight: 400; }
@media (prefers-reduced-motion: no-preference) {
  .trace path { stroke-dasharray: var(--len); stroke-dashoffset: var(--len); animation: draw 1.6s ease-out forwards; }
  @keyframes draw { to { stroke-dashoffset: 0; } }
}
@media (max-width: 860px) {
  .intro { grid-template-columns: 1fr; gap: 22px; padding-top: 28px; }
  .intro h1 { font-size: 30px; }
  .trace-seq { font-size: 11px; }
}

/* ---------- steps */
.step { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-m); padding: 24px 24px 26px; margin-bottom: 18px; }
.step h2 { display: flex; align-items: center; gap: 10px; font-size: 19px; margin: 0 0 18px; letter-spacing: -0.01em; }
.step-no { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--brand); color: #fff; font-size: 13px; font-weight: 700; }
.step-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.step-head h2 { margin: 0; }
.hint { color: var(--ink-3); font-size: 13.5px; margin: 0; }
@media (max-width: 640px) { .step { padding: 18px 14px 20px; } }

/* ---------- fields */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px 18px; }
.span-2 { grid-column: span 2; }
@media (max-width: 860px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } .span-2 { grid-column: auto; } }
.f { display: flex; flex-direction: column; gap: 5px; font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.f em { font-style: normal; font-weight: 400; color: var(--ink-3); }
input, select, textarea {
  font: 400 15px var(--sans);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-s);
  padding: 8px 10px;
  min-height: 40px;
  width: 100%;
}
textarea { resize: vertical; line-height: 1.45; }
input:hover, select:hover, textarea:hover { border-color: #b7c4d4; }
input:focus, select:focus, textarea:focus { border-color: var(--brand); outline: 2px solid var(--brand-tint); outline-offset: 0; }
.f.bad input, .f.bad textarea { border-color: var(--error); background: var(--error-tint); }
.f .err { color: var(--error); font-weight: 500; font-size: 12.5px; }
.check { display: flex; gap: 10px; align-items: flex-start; margin-top: 14px; font-size: 14.5px; }
.check input { width: 18px; height: 18px; min-height: 0; margin-top: 2px; accent-color: var(--brand); flex: none; }
.check.bad span { color: var(--error); }

/* ---------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: 600 14px var(--sans); color: var(--brand-ink);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-s);
  padding: 8px 14px; min-height: 38px; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--brand); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-ink); border-color: var(--brand-ink); }
.btn-quiet { border-color: transparent; color: var(--ink-2); }
.btn-quiet:hover { border-color: var(--line); }
.btn-small { min-height: 34px; padding: 5px 12px; }
.btn-big { min-height: 46px; padding: 10px 26px; font-size: 15.5px; }
.btn[disabled] { opacity: .55; cursor: progress; }

/* ---------- toolbar / bulk */
.toolbar { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.tb-group { display: flex; gap: 8px; flex-wrap: wrap; }
.bulk { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; background: var(--brand-tint); border-radius: var(--r-s); padding: 8px 10px; margin-bottom: 14px; font-size: 13.5px; color: var(--brand-ink); font-weight: 500; }
.bulk select { width: auto; min-height: 34px; padding: 4px 8px; font-size: 14px; }

/* ---------- oligo list */
.olist { border-top: 1px solid var(--line); }
.orow {
  display: grid;
  grid-template-columns: 30px minmax(130px, 1fr) minmax(230px, 2.4fr) 148px 116px 172px 62px 68px;
  gap: 8px 10px;
  align-items: start;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-2);
}
.ohead { font-size: 12.5px; font-weight: 600; color: var(--ink-3); padding: 8px 0; align-items: end; }
.orow .no { font: 600 13px var(--mono); color: var(--ink-3); padding-top: 11px; text-align: right; }
.orow input, .orow select { min-height: 38px; font-size: 14px; padding: 7px 8px; }
.orow .seq { font: 400 14px var(--mono); letter-spacing: .02em; }
.orow .note { min-height: 32px; font-size: 13px; padding: 5px 8px; margin-top: 6px; color: var(--ink-2); }
.orow .qty { text-align: center; }
.orow.bad { background: linear-gradient(90deg, var(--error-tint), transparent 60%); }
.orow .bad-field { border-color: var(--error); }
.meta { display: flex; align-items: center; gap: 10px; margin-top: 6px; font-size: 12.5px; color: var(--ink-3); min-height: 18px; flex-wrap: wrap; }
.meta b { color: var(--ink-2); font-weight: 600; font-variant-numeric: tabular-nums; }
.comp { display: inline-flex; width: 84px; height: 6px; border-radius: 3px; overflow: hidden; background: var(--line-2); flex: none; }
.comp i { display: block; height: 100%; }
.msg { font-size: 12.5px; margin-top: 4px; }
.msg.e { color: var(--error); font-weight: 500; }
.msg.w { color: var(--warn); }
.acts { display: flex; gap: 2px; justify-content: flex-end; }
.icon-btn { border: 0; background: none; color: var(--ink-3); width: 32px; height: 36px; border-radius: var(--r-s); cursor: pointer; display: grid; place-items: center; }
.icon-btn:hover { background: var(--line-2); color: var(--ink); }
.icon-btn.del:hover { color: var(--error); }
.icon-btn svg { width: 17px; height: 17px; }
.empty { color: var(--ink-3); padding: 22px 0 6px; margin: 0; }

@media (max-width: 1080px) {
  .ohead { display: none; }
  .orow {
    grid-template-columns: 28px minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) 64px;
    grid-template-areas:
      "no name name name acts"
      "no seq  seq  seq  seq"
      "no scale pur mod qty";
    padding: 14px 0;
  }
  .orow .no { grid-area: no; }
  .orow .c-name { grid-area: name; }
  .orow .c-seq { grid-area: seq; }
  .orow .c-scale { grid-area: scale; }
  .orow .c-pur { grid-area: pur; }
  .orow .c-mod { grid-area: mod; }
  .orow .c-qty { grid-area: qty; }
  .orow .c-acts { grid-area: acts; }
  .orow [data-label]::before { content: attr(data-label); display: block; font-size: 11.5px; font-weight: 600; color: var(--ink-3); margin-bottom: 3px; }
}
@media (max-width: 560px) {
  .orow {
    grid-template-columns: 22px minmax(0, 1.35fr) minmax(0, 1fr) 60px;
    grid-template-areas:
      "no name name acts"
      "no seq seq seq"
      "no scale pur pur"
      "no mod mod qty";
  }
}

/* ---------- banner / toast / dock */
.banner { border-radius: var(--r-s); padding: 12px 16px; margin-bottom: 16px; background: var(--error-tint); color: var(--error); font-weight: 500; border: 1px solid #f0c9c3; }
.toast { position: fixed; left: 50%; bottom: 92px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 10px 16px; border-radius: var(--r-s); font-size: 14px; z-index: 40; max-width: calc(100% - 32px); }
.dock { position: fixed; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,.96); border-top: 1px solid var(--line); z-index: 30; backdrop-filter: blur(6px); }
.dock-in { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 72px; }
.tally { display: flex; gap: 22px; flex-wrap: wrap; color: var(--ink-2); font-size: 14px; }
.tally strong { color: var(--ink); font-size: 18px; font-variant-numeric: tabular-nums; }
#tIssuesWrap strong, #tIssuesWrap { color: var(--error); }
@media (max-width: 560px) { .tally { gap: 12px; font-size: 13px; } .tally strong { font-size: 16px; } .btn-big { padding: 10px 16px; } }

/* ---------- dialog */
dialog { border: 0; border-radius: var(--r-m); padding: 0; width: min(680px, calc(100% - 32px)); color: var(--ink); box-shadow: 0 20px 60px rgba(21,35,59,.25); }
dialog::backdrop { background: rgba(21,35,59,.45); }
.dlg { padding: 22px; }
.dlg h2 { margin: 0 0 8px; font-size: 19px; }
.dlg textarea { font: 400 13.5px/1.5 var(--mono); margin: 12px 0 8px; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

/* ---------- done */
.done { background: var(--surface); border: 1px solid var(--line); border-left: 6px solid var(--leaf); border-radius: var(--r-m); padding: 30px; margin-top: 8px; margin-bottom: 20px; }
.done h2 { margin: 0 0 6px; font-size: 26px; color: var(--brand-ink); }
.done-no { font-size: 17px; margin: 0 0 8px; }
.done-no strong { font: 600 20px var(--mono); color: var(--ink); margin-left: 6px; }
.done p { color: var(--ink-2); max-width: 70ch; }
.done-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
body.is-done .dock { display: none; }

.foot { color: var(--ink-3); font-size: 13px; padding-top: 10px; padding-bottom: 20px; }
.foot p { margin: 0; }
.done .done-confirm { font-weight: 600; color: var(--ink); background: var(--brand-tint); border-radius: var(--r-s); padding: 10px 14px; }
.done .done-confirm.is-sent { background: #eef7e3; color: #3d6510; }

/* ---------- embedded in another website (?embed=1) */
.embed body { padding-bottom: 88px; }
.embed .brand, .embed .trace, .embed .foot, .embed .skip { display: none; }
.embed .topbar { background: none; border-bottom: 0; }
.embed .topbar-in { min-height: 0; padding-top: 12px; justify-content: flex-end; }
.embed .intro { display: block; padding-top: 8px; padding-bottom: 20px; }
.embed .intro h1 { font-size: 28px; margin-bottom: 8px; }
.embed .wrap { padding: 0 12px; }
/* frame sized to the full form by embed.js: floating parts follow the visible area */
.autoh .dock { position: absolute; bottom: auto; top: 0; }
.autoh .toast { position: absolute; bottom: auto; transform: translate(-50%, -100%); }
.autoh dialog { margin: 0 auto; bottom: auto; overflow: auto; }