:root {
  --bg: #f7f7fb;
  --surface: #ffffff;
  --surface-2: #eef0f8;
  --field-bg: #ffffff;
  --text: #1b1c2e;
  --muted: #5a5d77;
  --line: #dcdeed;
  --field-line: #8286a3; /* 入力欄の枠は背景と 3:1 以上 */
  --accent: #4338ca;
  --accent-ink: #ffffff;
  --accent-soft: #e8e9fb;
  --ok: #0f7a4a;
  --warn: #a14a05;
  --warn-soft: #fdf1e0;
  --error: #b91c1c;
  --error-soft: #fdecec;
  --guide: #e11d48;
  --radius: 12px;
  --tap: 44px;
  --shadow: 0 1px 2px rgb(20 20 60 / 0.05), 0 2px 8px rgb(20 20 60 / 0.05);
  --font: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Noto Sans Mono CJK JP", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12131f;
    --surface: #1b1c2c;
    --surface-2: #25263a;
    --field-bg: #25263a;
    --text: #e8e9f5;
    --muted: #a3a6c2;
    --line: #34364f;
    --field-line: #7b7f9f;
    --accent: #a5b4fc;
    --accent-ink: #14153a;
    --accent-soft: #272a4d;
    --ok: #4ade80;
    --warn: #fbbf24;
    --warn-soft: #2c2616;
    --error: #f87171;
    --error-soft: #331c1f;
    --shadow: none;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  overflow-wrap: break-word;
  line-break: strict;
}

/* 日本語の見出し・説明は文節の切れ目で折り返す（対応ブラウザのみ） */
h1, h2, h3, .lead, .tool-list span, .faq summary { word-break: auto-phrase; text-wrap: balance; }

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: 820px; margin: 0 auto; padding: 0 16px; }

.skip-link { position: absolute; left: 8px; top: -60px; z-index: 10; background: var(--accent); color: var(--accent-ink); padding: 10px 14px; border-radius: 8px; font-weight: 700; text-decoration: none; }
.skip-link:focus { top: 8px; }
main:focus { outline: none; }

/* ヘッダー */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.site-header > .wrap { display: flex; align-items: center; min-height: 56px; }
.logo { display: inline-flex; align-items: center; gap: 8px; min-height: var(--tap); color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.1rem; }
.logo svg { color: var(--accent); }
.logo small { color: var(--muted); font-weight: 500; font-size: 0.8rem; letter-spacing: 0.02em; }
.site-nav { border-top: 1px solid var(--line); }
.site-nav .wrap { display: flex; gap: 4px; overflow-x: auto; padding-top: 4px; padding-bottom: 4px; scrollbar-width: none; }
.site-nav .wrap::-webkit-scrollbar { display: none; }
.site-nav a { flex: none; display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 12px; border-radius: 999px; color: var(--muted); text-decoration: none; font-size: 0.9rem; white-space: nowrap; }
.site-nav a:hover { background: var(--surface-2); color: var(--text); }
.site-nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 700; }

/* 本文 */
main { padding-bottom: 48px; }
.crumbs { margin-top: 4px; font-size: 0.85rem; color: var(--muted); display: flex; flex-wrap: wrap; align-items: center; gap: 0 6px; }
.crumbs a { color: var(--muted); display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 10px; margin: 0 -4px 0 -10px; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 20px 0 8px; }
.lead { color: var(--muted); margin: 0 0 20px; }
h2 { font-size: 1.25rem; line-height: 1.5; margin: 40px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--line); }
h3 { font-size: 1.05rem; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 14px; }
li { margin-bottom: 4px; }
code { font-family: var(--mono); font-size: 0.92em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.note { font-size: 0.88rem; color: var(--muted); }
.meta { font-size: 0.85rem; color: var(--muted); margin-top: 32px; }
.callout { background: var(--warn-soft); border-left: 4px solid var(--warn); padding: 10px 14px; border-radius: 6px; font-size: 0.93rem; margin: 16px 0; }
.sources ul { font-size: 0.92rem; }
.sources li { margin-bottom: 0; }
.sources li a { display: inline-block; padding: 10px 0; }
.contact-mail { font-size: 1.2rem; font-weight: 700; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.mt-0 { margin-top: 0 !important; }
.mt-s { margin-top: 8px; }
.mt-m { margin-top: 12px; }

table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 0.95rem; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface-2); font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
th[scope="row"] a { display: inline-flex; align-items: center; min-height: var(--tap); white-space: nowrap; }
.table-scroll { overflow-x: auto; margin-bottom: 16px; position: relative; }
.table-scroll table { margin: 0; }
@media (max-width: 640px) {
  table.stack, table.stack tbody, table.stack tr, table.stack th, table.stack td { display: block; }
  table.stack thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  table.stack tr { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; margin: 0 0 10px; overflow: hidden; }
  table.stack th[scope="row"] { border: 0; background: var(--surface-2); padding: 2px 12px; }
  table.stack td { border: 0; border-top: 1px solid var(--line); padding: 8px 12px; text-align: left; }
  table.stack td::before { content: attr(data-label); display: block; color: var(--muted); font-size: 0.82rem; font-weight: 600; }
  table.stack td.num { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-variant-numeric: tabular-nums; }
  table.stack td.num::before { display: inline; }
}

/* フォーム部品 */
label { font-size: 0.9rem; color: var(--muted); }
input[type="text"], select {
  font: inherit;
  font-size: 1.05rem;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--field-line);
  border-radius: 8px;
  padding: 8px 10px;
  min-height: var(--tap);
  width: 100%;
}
input[aria-invalid="true"] { border-color: var(--error); box-shadow: 0 0 0 1px var(--error); }
input:focus-visible, select:focus-visible, button:focus-visible, summary:focus-visible, a:focus-visible, .stage:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.field { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: end; }
fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px 12px; margin: 0 0 12px; min-width: 0; }
legend { font-weight: 700; font-size: 0.95rem; padding: 0 6px; color: var(--text); }

.btn {
  font: inherit;
  font-size: 0.95rem;
  border-radius: 8px;
  border: 1px solid var(--field-line);
  background: var(--surface);
  color: var(--text);
  padding: 8px 14px;
  min-height: var(--tap);
  cursor: pointer;
  touch-action: manipulation;
}
.btn:hover:not(:disabled):not([aria-disabled="true"]) { background: var(--surface-2); }
.btn:disabled, .btn[aria-disabled="true"] { cursor: not-allowed; opacity: 0.85; color: var(--muted); }
/* 「準備中」のボタンは押せないが、文字は読ませる（aria-disabled は透過しない。4.5:1 を保つ） */
.btn[aria-disabled="true"]:not(:disabled) { opacity: 1; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.btn-primary:hover:not(:disabled):not([aria-disabled="true"]) { background: var(--accent); filter: brightness(1.08); }
.btn-primary:disabled, .btn-primary[aria-disabled="true"] { background: var(--surface-2); border-color: var(--field-line); color: var(--muted); filter: none; }
.btn-big { min-height: 52px; font-size: 1.05rem; padding: 10px 20px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

/* 次のステップ: 広告に見えない控えめなカード（JS なし） */
.next-step { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 6px; padding: 12px 16px 14px; margin: 20px 0; }
.next-step p { margin: 0; }
.next-step-label { font-size: 0.8rem; color: var(--muted); letter-spacing: 0.04em; }
.next-step-title { font-weight: 700; font-size: 1.02rem; margin-top: 2px !important; }
.next-step-text { font-size: 0.93rem; margin-top: 4px !important; }
a.next-step-cta { display: inline-flex; align-items: center; justify-content: center; box-sizing: border-box; margin-top: 10px; text-decoration: none; color: var(--text); font-weight: 600; min-height: var(--tap); }
@media (max-width: 480px) { a.next-step-cta { display: flex; } }

/* ツールのカード */
.tool { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin: 0 0 20px; }
.tool > h2:first-child { margin-top: 0; font-size: 1.1rem; border: 0; padding: 0; }
.tool-hint { font-size: 0.88rem; color: var(--muted); margin: 6px 0 12px; }
.tool h3 { margin: 0 0 6px; }

.steps { display: flex; gap: 6px; list-style: none; padding: 0; margin: 0 0 8px; }
.steps li { flex: 1; display: flex; align-items: center; justify-content: center; gap: 6px; min-height: 36px; margin: 0; padding: 0 6px; border-radius: 999px; background: var(--surface-2); color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.steps .num { display: inline-flex; align-items: center; justify-content: center; width: 20px; height: 20px; border-radius: 50%; border: 1px solid currentColor; font-size: 0.75rem; }
.steps li[aria-current="step"] { background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.status { min-height: 1.7em; margin: 0 0 8px; font-size: 0.92rem; color: var(--text); }

.pick-row { display: flex; flex-wrap: wrap; gap: 10px; }
.pick-row .btn { flex: 1 1 180px; }
.drop { margin-top: 8px; padding: 14px; border: 2px dashed var(--field-line); border-radius: 12px; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.load-box { margin-top: 12px; }
progress { width: 100%; height: 14px; accent-color: var(--accent); }
.msg { margin: 12px 0 0; padding: 10px 14px; border-left: 4px solid var(--error); background: var(--error-soft); border-radius: 6px; font-size: 0.93rem; }
.checks { list-style: none; padding: 0; margin: 14px 0 0; font-size: 0.88rem; color: var(--muted); }
.checks li { padding-left: 1.4em; position: relative; margin-bottom: 4px; }
.checks li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }

.notes { list-style: none; padding: 0; margin: 0 0 12px; }
.notes li { padding: 8px 12px; border-left: 4px solid var(--warn); background: var(--warn-soft); border-radius: 6px; font-size: 0.9rem; margin-bottom: 6px; line-height: 1.6; }
.notes li.note-error { border-left-color: var(--error); background: var(--error-soft); }

/* 編集画面 */
.edit-grid { display: grid; gap: 16px; }
.stage { position: relative; width: min(100%, 260px); margin: 0 auto; background: #cfd2e0; border: 1px solid var(--field-line); border-radius: 4px; touch-action: none; user-select: none; -webkit-user-select: none; cursor: grab; overflow: hidden; }
.stage.dragging { cursor: grabbing; }
.stage canvas, .stage svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.g-band { fill: var(--guide); fill-opacity: 0.16; }
.g-halo { stroke: #fff; stroke-opacity: 0.85; stroke-width: 3.4px; fill: none; vector-effect: non-scaling-stroke; }
.g-line { stroke: var(--guide); stroke-width: 1.6px; fill: none; stroke-dasharray: 5 4; vector-effect: non-scaling-stroke; }
.g-halo.g-face, .g-face { stroke-dasharray: 2 4; }
.g-halo.g-face { stroke-dasharray: none; stroke-width: 3px; stroke-opacity: 0.5; }
.stage-help { text-align: center; }
.readout { display: grid; gap: 4px; margin: 0 0 8px; padding: 10px 12px; background: var(--surface-2); border-radius: 10px; font-size: 0.9rem; }
.readout > div { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 12px; }
.readout dt { color: var(--muted); }
.readout dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }
.readout dd.ok { color: var(--ok); }
.readout dd.ng { color: var(--warn); }
.legend { text-align: center; margin: 0; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; display: inline-flex; }
.chip input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.chip span { display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 16px; border: 1px solid var(--field-line); border-radius: 999px; background: var(--field-bg); color: var(--text); font-size: 0.95rem; }
.chip input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.chip input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }
.chip input:disabled + span { opacity: 0.5; cursor: not-allowed; }

.slider { margin-bottom: 4px; }
.slider label { display: flex; justify-content: space-between; color: var(--text); }
.slider output { font-variant-numeric: tabular-nums; color: var(--muted); }
input[type="range"] { width: 100%; min-height: var(--tap); margin: 0; accent-color: var(--accent); touch-action: manipulation; }
.nudge-pad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 4px 0 10px; }
.nudge { font-size: 1.2rem; padding: 0; }

/* 保存画面 */
.save-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 12px; align-items: start; margin-bottom: 16px; }
figure { margin: 0; }
figcaption { font-size: 0.82rem; color: var(--muted); margin-top: 6px; line-height: 1.5; }
.prev { background: var(--surface-2); border: 1px solid var(--line); border-radius: 6px; padding: 6px; }
.prev canvas { display: block; width: 100%; height: auto; }
.buy-box, .sample-box { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 12px; }
.buy-box { background: var(--accent-soft); }
.buy-box p { margin-bottom: 10px; }
.buy-box .btn { width: 100%; }
.buy-box .btn-row .btn { width: auto; flex: 1 1 200px; }
.buy-box .note { margin: 8px 0 0; }
.step-nav { justify-content: space-between; }

/* 一覧・FAQ */
.tool-list { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.tool-list li { margin: 0; }
.tool-list a { display: block; height: 100%; padding: 12px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--text); }
.tool-list a:hover { border-color: var(--accent); }
.tool-list strong { display: block; color: var(--accent); }
.tool-list span { display: block; font-size: 0.86rem; color: var(--muted); line-height: 1.6; }
.faq details { border: 1px solid var(--line); border-radius: 10px; background: var(--surface); margin-bottom: 8px; }
.faq summary { cursor: pointer; padding: 10px 14px; font-weight: 600; min-height: var(--tap); }
.faq details > div { padding: 0 14px 4px; }
.price-box { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 16px; padding: 0; list-style: none; }
.price-box li { flex: 1 1 220px; margin: 0; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
.price-box strong { display: block; font-size: 1.5rem; line-height: 1.3; }
.price-box span { font-size: 0.88rem; color: var(--muted); }
.diagram { display: block; width: 100%; max-width: 360px; height: auto; margin: 8px auto 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.diagram text { fill: var(--text); font-family: var(--font); }
.diagram .d-photo { fill: var(--surface-2); stroke: var(--text); }
.diagram .d-head { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.diagram .d-dim { stroke: var(--accent); fill: none; stroke-width: 1.5; }
.diagram .d-label { fill: var(--accent); font-weight: 700; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 20px 0 28px; font-size: 0.88rem; color: var(--muted); }
.site-footer p { margin: 0 0 6px; }
.site-footer a { color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0 18px; }
.footer-links a { display: inline-flex; align-items: center; min-height: var(--tap); }

@media (min-width: 720px) {
  .edit-grid { grid-template-columns: minmax(0, 320px) minmax(0, 1fr); align-items: start; }
  .stage { width: min(100%, 300px); }
}

@media (max-width: 480px) {
  h1 { font-size: 1.4rem; }
  .steps li { font-size: 0.8rem; gap: 4px; padding: 0 4px; }
  .save-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

@media print {
  .site-header, .site-nav, .related, .site-footer, .btn-row, .next-step, .skip-link { display: none !important; }
  body { background: #fff; }
}