:root {
  --bg: #f7f6f2; --card: #fff; --ink: #1f2430; --sub: #5a6070; --line: #d9d6cc;
  --accent: #1f5f8b; --accent-ink: #fff; --ok: #1d6b45; --ok-bg: #e5f3ea;
  --warn: #8a5300; --warn-bg: #fdf0d8; --stop: #8a2a2a; --stop-bg: #f9e4e4;
  --mark: #ffe08a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181f; --card: #1f232c; --ink: #eceef3; --sub: #aab0bf; --line: #3a4050;
    --accent: #6fb3e0; --accent-ink: #0d1117; --ok: #7bd3a1; --ok-bg: #1b3a2a;
    --warn: #f0c36d; --warn-bg: #3d2f12; --stop: #f0a0a0; --stop-bg: #432020; --mark: #6b5510;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.8; font-size: 18px;
  font-family: "BIZ UDPGothic", "Yu Gothic UI", "Hiragino Sans", Meiryo, sans-serif; }
header.site, nav, main { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.site { padding-top: 20px; }
h1 { font-size: 1.4rem; margin: 0 0 8px; }
h1 span { font-size: .85rem; font-weight: normal; color: var(--sub); margin-left: .5em; }
h2 { font-size: 1.25rem; margin: 0 0 12px; }
.banner { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: 8px 12px; font-size: .85rem; margin: 0 0 12px; line-height: 1.6; }
nav ol { list-style: none; display: flex; gap: 6px; padding: 0; margin: 0 0 16px; flex-wrap: wrap; }
nav li { flex: 1 1 0; min-width: 70px; text-align: center; font-size: .8rem; padding: 6px 4px; border-radius: 8px;
  background: var(--card); border: 1px solid var(--line); color: var(--sub); }
nav li[aria-current="step"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: bold; }
nav li.done { color: var(--ok); }
main { padding-bottom: 64px; outline: none; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.choice { display: block; width: 100%; text-align: left; font: inherit; color: inherit; background: var(--card);
  border: 2px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 8px; cursor: pointer; }
.choice:hover { border-color: var(--accent); }
.choice small { display: block; color: var(--sub); font-size: .8rem; }
.choice[aria-pressed="true"], label.opt:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--card)); }
label.opt { display: flex; gap: 10px; align-items: flex-start; border: 2px solid var(--line); border-radius: 10px;
  padding: 10px 14px; margin-bottom: 8px; cursor: pointer; }
label.opt input { margin-top: .45em; width: 1.1em; height: 1.1em; }
button.primary, button.secondary { font: inherit; border-radius: 10px; padding: 10px 20px; cursor: pointer; border: 2px solid var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); }
button.secondary { background: transparent; color: var(--accent); }
button:disabled { opacity: .45; cursor: not-allowed; }
button:focus-visible, .choice:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.src { white-space: pre-wrap; background: var(--bg); border-radius: 8px; padding: 12px; margin: 0 0 12px; }
mark { background: var(--mark); color: inherit; text-decoration: underline wavy; text-underline-offset: 4px; padding: 0 2px; border-radius: 3px; }
textarea { width: 100%; font: inherit; color: inherit; background: var(--bg); border: 2px dashed var(--line); border-radius: 8px; padding: 10px; min-height: 5em; }
.note { color: var(--sub); font-size: .85rem; line-height: 1.6; }
.verify { font-size: .85rem; border-radius: 8px; padding: 6px 10px; margin: 0 0 10px; line-height: 1.6; }
.verify.ok { background: var(--ok-bg); color: var(--ok); }
.verify.ng { background: var(--stop-bg); color: var(--stop); }
.formbody { white-space: pre-line; }
ul.todo { list-style: none; padding: 0; margin: 0; }
ul.todo li { display: flex; gap: 10px; padding: 6px 0; }
ul.todo input { width: 1.2em; height: 1.2em; margin-top: .4em; }
ol.flow { list-style: none; padding: 0; margin: 0; }
ol.flow li { position: relative; border: 2px solid var(--accent); border-radius: 10px; padding: 8px 12px; margin-bottom: 26px; background: var(--card); }
ol.flow li:not(:last-child)::after { content: "▼"; position: absolute; left: 50%; bottom: -24px; transform: translateX(-50%); color: var(--accent); font-size: 1rem; }
.result { border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.result.go { background: var(--ok-bg); color: var(--ok); }
.result.confirm { background: var(--warn-bg); color: var(--warn); }
.result.wait { background: var(--stop-bg); color: var(--stop); }
.result h2 { margin: 0 0 6px; }
@media (max-width: 480px) { body { font-size: 17px; } }