:root {
  --bg: #f6f7f9; --card: #ffffff; --ink: #14181f; --muted: #5a6472; --line: #d9dee5;
  --brand: #0b5fff; --brand-ink: #ffffff; --ok: #0a7a3d; --warn: #9a5b00; --bad: #b3261e; --info: #1f5fbf;
  --ok-bg: #e6f4ec; --warn-bg: #fff3dc; --bad-bg: #fde8e7; --info-bg: #e7efff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216; --card: #171b21; --ink: #eef1f5; --muted: #a3adbb; --line: #2b323c;
    --brand: #6ea0ff; --brand-ink: #0b0e12; --ok: #5fd08f; --warn: #f0b555; --bad: #ff8a80; --info: #8fb4ff;
    --ok-bg: #12301f; --warn-bg: #33270f; --bad-bg: #3a1716; --info-bg: #142546;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--ink); }
.top { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--line); background: var(--card); }
.brand { font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.logo { color: var(--brand); }
.tag { color: var(--muted); font-size: 14px; }
main { max-width: 920px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 0 0 16px; }
h1 { font-size: 22px; margin: 0 0 8px; } h2 { font-size: 18px; margin: 0 0 8px; } h3 { font-size: 16px; margin: 12px 0 6px; }
.muted { color: var(--muted); } .small { font-size: 14px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; } .between { justify-content: space-between; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.btn { display: inline-block; min-height: 44px; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-decoration: none; font: inherit; cursor: pointer; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); font-weight: 600; }
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
.btn[disabled] { opacity: .6; cursor: progress; }
.sample { text-align: left; } .sample b { display: block; } .sample span { color: var(--muted); font-size: 14px; }
.form label { display: block; margin: 8px 0; font-weight: 600; }
.form input, .form select { display: block; width: 100%; min-height: 44px; margin-top: 4px; padding: 8px; font: inherit;
  border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); }
.form .check { display: flex; gap: 10px; font-weight: 400; } .form .check input { width: 24px; min-height: 24px; flex: none; }
fieldset { border: 1px solid var(--line); border-radius: 10px; margin: 12px 0; } legend { font-weight: 700; padding: 0 6px; }
.steps li { margin: 6px 0; }
.badge { display: inline-block; padding: 4px 10px; border-radius: 999px; font-weight: 700; font-size: 14px; border: 1px solid var(--line); }
.s-ok { background: var(--ok-bg); color: var(--ok); } .s-warn { background: var(--warn-bg); color: var(--warn); }
.s-bad { background: var(--bad-bg); color: var(--bad); } .s-info { background: var(--info-bg); color: var(--info); }
.timeline { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.timeline li { padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line); font-size: 14px; }
.timeline li.done { background: var(--ok-bg); color: var(--ok); } .timeline li.now { background: var(--info-bg); color: var(--info); font-weight: 700; }
.callout { border-left: 5px solid var(--warn); background: var(--warn-bg); padding: 12px 14px; border-radius: 8px; margin: 10px 0; }
.callout.bad { border-color: var(--bad); background: var(--bad-bg); } .callout.ok { border-color: var(--ok); background: var(--ok-bg); }
.callout.info { border-color: var(--info); background: var(--info-bg); }
.kv { display: grid; grid-template-columns: minmax(150px, 40%) 1fr; gap: 4px 12px; margin: 6px 0; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; } @media (max-width: 680px) { .cols { grid-template-columns: 1fr; } }
.checklist { list-style: none; padding: 0; margin: 6px 0; } .checklist li { margin: 2px 0; }
.decision { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin: 8px 0; }
.decision .what { font-weight: 700; } .decision .why { color: var(--muted); font-size: 14px; }
canvas { width: 100%; height: 220px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: 14px; } td, th { border-bottom: 1px solid var(--line); padding: 6px; text-align: left; vertical-align: top; }
.tablewrap { overflow-x: auto; }
.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--brand); border-radius: 50%; animation: spin 1s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } } @media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }
.foot { max-width: 920px; margin: 0 auto; padding: 8px 16px 32px; }

/* overflow hardening for narrow screens */
.cols > div, .card, .kv dd, .decision { min-width: 0; }
.kv { grid-template-columns: minmax(0, 40%) minmax(0, 1fr); }
canvas { max-width: 100%; }
.card, .callout, li { overflow-wrap: anywhere; }

main:focus { outline: none; }

/* Instrument-inspired visual hierarchy, with the existing accessible controls. */
:root { --brand: #087f72; --brand-ink: #ffffff; }
.top { padding: 20px max(20px, calc((100vw - 1080px) / 2)); align-items: center; }
.brand { letter-spacing: -.7px; font-size: 25px; }
.tag { margin-left: auto; font-size: 12px; }
main { max-width: 1080px; padding-top: 28px; }
.card { border-radius: 18px; padding: 26px; margin-bottom: 22px; box-shadow: 0 4px 18px #14281f04; }
.hero { position: relative; overflow: hidden; padding: 44px; background: linear-gradient(125deg, #102d2b, #164b45); color: #f3fbf8; border-color: #225e54; }
.hero::after { content: ''; position: absolute; width: 320px; height: 320px; border: 1px solid #79dbb92b; border-radius: 50%; right: -150px; top: -145px; box-shadow: 0 0 0 45px #79dbb90c, 0 0 0 90px #79dbb908; pointer-events: none; }
.eyebrow { color: #8ee4c9; font-size: 11px; font-weight: 750; letter-spacing: 2px; margin: 0 0 18px; }
.hero h1 { font-size: clamp(30px, 4.8vw, 48px); line-height: 1.12; letter-spacing: -1.8px; max-width: 760px; }
.hero > p:not(.eyebrow) { max-width: 690px; color: #c4dcd6; margin: 20px 0 26px; }
.hero .btn { background: transparent; color: #e4f4ef; border-color: #58867c; }
.hero .btn.primary { background: #95edcc; border-color: #95edcc; color: #102d2b; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 18px 28px; border-top: 1px solid #ffffff24; margin-top: 35px; padding-top: 23px; font-size: 12px; color: #c4dcd6; }
.hero-facts b { color: #95edcc; margin-right: 7px; }
.sample { padding: 20px; transition: border-color .15s, transform .15s; }
.sample:hover { border-color: var(--brand); transform: translateY(-2px); }
.sample b { margin-bottom: 9px; font-size: 15px; }
.sample span { display: block; font-size: 13px; line-height: 1.6; }
.trust-panel { border-left: 4px solid var(--brand); }
.foot { max-width: 1080px; }
@media (max-width: 600px) { .hero { padding: 27px 22px; } .card { padding: 21px; } .tag { margin-left: 0; } .grid { grid-template-columns: 1fr; } .hero-facts { gap: 12px; flex-direction: column; } }
@media (prefers-reduced-motion: reduce) { .sample { transition: none; } .sample:hover { transform: none; } }