:root {
  --navy: #142d46; --teal: #087f83; --teal-dark: #066a6e; --mist: #eaf4f3; --ink: #182c3d; --muted: #4a5b6b;
  --paper: #f7fbfb; --line: #c7d6d9; --ok: #1d6b3a; --ok-bg: #e3f3e8; --warn: #8a5300; --warn-bg: #fff1d6;
  --stop: #a4271c; --stop-bg: #fdeae7; --shell: #dfe8ea;
  --base: 18px;
}
:root[data-large="1"] { --base: 22px; }
@media (prefers-color-scheme: dark) {
  /* The phone screens stay light on purpose: outdoor readability beats theme matching for this audience. */
  body { background: #0f1c28; color: #dbe6ee; }
  .designer { background: #172736; border-color: #2c4257; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background: var(--shell); color: var(--ink); }
.banner { background: var(--navy); color: #fff; text-align: center; font-size: 13px; letter-spacing: .04em; padding: 8px 16px; }
.designer { max-width: 980px; margin: 16px auto 0; padding: 12px 16px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.designer h1 { font-size: 18px; margin: 0 0 4px; }
.designer p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.tabs button, .opts button { min-height: 40px; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: inherit; font-size: 14px; cursor: pointer; }
.tabs button[aria-pressed="true"], .opts button[aria-pressed="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
.opts { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 14px; }
.stage { display: flex; justify-content: center; padding: 16px; }
.phone { width: 100%; max-width: 400px; min-height: 640px; background: var(--paper); border: 10px solid #22323f; border-radius: 34px; overflow: hidden; display: flex; flex-direction: column; color: var(--ink); }
.helper { max-width: 760px; width: 100%; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; color: var(--ink); }
.bar { background: var(--navy); color: #fff; padding: 12px 18px; font-size: 14px; display: flex; justify-content: space-between; }
.screen { padding: 20px 18px 24px; font-size: var(--base); flex: 1; display: flex; flex-direction: column; gap: 14px; }
.screen h2 { font-size: 1.35em; line-height: 1.2; margin: 0; }
.sub { color: var(--muted); margin: 0; font-size: .92em; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card h3 { margin: 0 0 6px; font-size: .95em; text-transform: none; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.list li { display: flex; gap: 10px; align-items: flex-start; }
.mark { flex: none; width: 1.6em; height: 1.6em; border-radius: 50%; display: inline-grid; place-items: center; font-weight: 700; font-size: .85em; }
.yes .mark { background: var(--ok-bg); color: var(--ok); }
.no .mark { background: var(--stop-bg); color: var(--stop); }
.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.seg button { min-height: 54px; border-radius: 12px; border: 2px solid var(--line); background: #fff; font: inherit; font-weight: 600; color: var(--ink); cursor: pointer; }
.seg button[aria-pressed="true"] { border-color: var(--teal); background: var(--mist); color: var(--teal-dark); }
.btn { min-height: 56px; border-radius: 14px; border: 2px solid var(--teal); background: var(--teal); color: #fff; font: inherit; font-weight: 700; cursor: pointer; padding: 10px 14px; width: 100%; }
.btn:hover { background: var(--teal-dark); }
.btn.secondary { background: #fff; color: var(--teal-dark); }
.btn.danger { background: #fff; color: var(--stop); border-color: var(--stop); }
.btn.danger.solid { background: var(--stop); color: #fff; }
.btn.quiet { border-color: transparent; background: transparent; color: var(--muted); font-weight: 600; min-height: 48px; text-decoration: underline; }
button:focus-visible { outline: 3px solid #f2a900; outline-offset: 2px; }
.pill { display: inline-flex; gap: 8px; align-items: center; padding: 6px 12px; border-radius: 999px; font-weight: 700; font-size: .95em; }
.pill.ok { background: var(--ok-bg); color: var(--ok); } .pill.warn { background: var(--warn-bg); color: var(--warn); } .pill.stop { background: var(--stop-bg); color: var(--stop); }
.code { font: 700 1.1em ui-monospace, Consolas, monospace; letter-spacing: .12em; background: var(--mist); padding: 2px 8px; border-radius: 6px; }
.message { background: #e9edf0; border-radius: 18px 18px 18px 4px; padding: 12px 14px; }
.spacer { flex: 1; }
.pulse { width: 92px; height: 92px; margin: 8px auto; border-radius: 50%; background: var(--mist); border: 3px solid var(--teal); display: grid; place-items: center; font-size: 34px; animation: pulse 1.6s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .pulse { animation: none; } }
@keyframes pulse { 50% { box-shadow: 0 0 0 14px rgba(8,127,131,.15); } }
.helper .screen { gap: 12px; }
.step { display: grid; grid-template-columns: 2.2em 1fr; gap: 10px; }
.step b { background: var(--navy); color: #fff; width: 2em; height: 2em; border-radius: 50%; display: grid; place-items: center; }
pre.cmd { background: #10202d; color: #e6f2f2; border-radius: 8px; padding: 10px 12px; overflow-x: auto; font-size: .8em; margin: 6px 0 0; }
.note { font-size: .82em; color: var(--muted); }
.backnav { max-width: 980px; margin: 10px auto 0; padding: 0 16px; font-size: .9em; }
.backnav a { color: var(--teal-dark); font-weight: 600; text-decoration: none; }
.backnav a:hover { text-decoration: underline; }
.backnav .sep { color: var(--line); margin: 0 6px; }