:root {
  --bg: #f6f6f4;
  --panel: #ffffff;
  --panel-2: #fbfbfa;
  --line: #e2e1dd;
  --line-strong: #cfcec8;
  --ink: #1a1a18;
  --ink-2: #55544e;
  --ink-3: #8b897f;
  --accent: #14524a;
  --accent-ink: #ffffff;
  --warn-bg: #fdf4e3;
  --warn-line: #e6c983;
  --warn-ink: #6b4d0c;
  --ok: #1c6b45;
  --radius: 6px;
  --sp: 8px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131412;
    --panel: #1b1c1a;
    --panel-2: #202220;
    --line: #2e302d;
    --line-strong: #3d403c;
    --ink: #f0efea;
    --ink-2: #b4b2a9;
    --ink-3: #83817a;
    --accent: #6fd3bd;
    --accent-ink: #0d1f1c;
    --warn-bg: #2b2410;
    --warn-line: #6b551f;
    --warn-ink: #e8cd8a;
    --ok: #6fd3a0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
  font-feature-settings: "tnum" 1;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

/* header */
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px 24px; background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand img { height: 22px; width: auto; }
.top nav { display: flex; align-items: center; gap: 16px; font-size: 13px; }
.who { color: var(--ink-3); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 32px 24px 96px; }
.narrow { max-width: 420px; margin: 0 auto; padding: 12vh 24px 96px; }

h1 { font-size: 24px; letter-spacing: -0.02em; margin: 0 0 4px; }
h2 { font-size: 16px; letter-spacing: -0.01em; margin: 32px 0 12px; }
.sub { color: var(--ink-3); font-size: 13px; margin: 0 0 24px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* forms */
label { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); margin-bottom: 6px; }
input[type=text], input[type=email], input[type=password], input[type=file], textarea, select {
  width: 100%; padding: 9px 11px; font: inherit; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line-strong); border-radius: var(--radius);
}
textarea { font: 13px/1.6 var(--mono); resize: vertical; }
input:focus, textarea:focus { border-color: var(--accent); outline: none; }
.field { margin-bottom: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }

button, .btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px;
  font: 500 14px/1 var(--sans); cursor: pointer;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: var(--radius);
}
button:hover, .btn:hover { border-color: var(--ink-3); text-decoration: none; }
.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.primary:hover { filter: brightness(1.08); }
.danger { color: #b4342b; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* cards + list */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card + .card { margin-top: 12px; }
.list { display: grid; gap: 8px; }
.item {
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px;
}
.item h3 { margin: 0; font-size: 15px; }
.meta { color: var(--ink-3); font-size: 12px; font-family: var(--mono); }
.empty { text-align: center; padding: 56px 24px; border: 1px dashed var(--line-strong); border-radius: var(--radius); color: var(--ink-3); }

/* requirement */
.req { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.req > summary { padding: 14px 16px; cursor: pointer; display: flex; gap: 12px; align-items: baseline; }
.req > summary::marker { color: var(--ink-3); }
.req[open] > summary { border-bottom: 1px solid var(--line); }
.ref { font: 600 12px/1.4 var(--mono); color: var(--accent); background: var(--panel-2); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; }
.req-body { padding: 16px; }
.need { color: var(--ink-2); margin: 0 0 16px; }
.opt { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 8px; background: var(--panel-2); cursor: pointer; }
.opt:has(input:checked) { border-color: var(--accent); box-shadow: inset 3px 0 0 var(--accent); }
.opt input { margin-right: 8px; }
.opt b { font-weight: 600; }
.opt p { margin: 6px 0 0 22px; color: var(--ink-2); font-size: 13.5px; }
.opt .tags { margin: 8px 0 0 22px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); }
.done { color: var(--ok); font-size: 12px; font-family: var(--mono); }
.todo { color: var(--warn-ink); background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 4px; padding: 1px 6px; font-size: 11.5px; font-family: var(--mono); }

.note { background: var(--warn-bg); border: 1px solid var(--warn-line); color: var(--warn-ink); border-radius: var(--radius); padding: 12px 16px; font-size: 13.5px; }
.note ul { margin: 8px 0 0; padding-left: 20px; }
.err { border-color: #d68b84; background: #fdeeec; color: #8c2b22; }
@media (prefers-color-scheme: dark) { .err { border-color: #6b2f29; background: #2b1614; color: #f0b4ac; } }

/* rendered SOW */
.doc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 40px; }
.doc h1 { font-size: 26px; }
.doc h2 { font-size: 19px; margin-top: 36px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.doc h3 { font-size: 15.5px; margin-top: 24px; }
.doc table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13.5px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
.doc th { background: var(--panel-2); font-weight: 600; }
.doc code { font: 13px var(--mono); background: var(--panel-2); padding: 1px 5px; border-radius: 3px; }
.doc li { margin: 3px 0; }
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.spin { display: none; }
form.busy .spin { display: inline; }
form.busy button { opacity: .5; pointer-events: none; }