:root {
  --bg: #f7f8fa; --panel: #ffffff; --ink: #1c2430; --muted: #5b6675; --line: #dfe4ea;
  --accent: #0b5fff; --accent-ink: #ffffff; --ok: #0a7a3d; --err: #c62828; --soft: #eef3ff; --code: #f1f3f6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1419; --panel: #161c24; --ink: #e6ebf2; --muted: #9aa6b5; --line: #2a3441;
    --accent: #4f8cff; --accent-ink: #0b1220; --soft: #1b2433; --code: #1b222c; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 900px; margin: 0 auto; padding: 0 16px; }
.site-header { background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 52px; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--ink); font-size: 1.05em; white-space: nowrap; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; font-size: 0.86em; }
.site-nav a { padding: 4px 8px; border-radius: 6px; color: var(--muted); }
.site-nav a:hover { background: var(--soft); text-decoration: none; }
main.wrap { padding: 20px 16px 48px; }
.breadcrumb { font-size: 0.82em; color: var(--muted); margin: 0 0 12px; }
.breadcrumb a { color: var(--muted); }
h1 { font-size: 1.55em; line-height: 1.35; margin: 0 0 6px; }
.lead { color: var(--muted); margin: 0 0 18px; }
h2 { font-size: 1.2em; margin: 1.8em 0 0.6em; padding-left: 0.5em; border-left: 4px solid var(--accent); }
h3 { font-size: 1.02em; margin: 1.3em 0 0.4em; }
p { margin: 0 0 1em; }
code, .mono, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace; }
code { background: var(--code); padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.92em; }
pre { background: var(--code); padding: 12px; border-radius: 8px; overflow-x: auto; font-size: 0.9em; }
table { border-collapse: collapse; width: 100%; margin: 0 0 1em; font-size: 0.94em; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }

/* tool panel */
.tool { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 0 0 20px; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > .field { flex: 1 1 200px; }
.field { display: flex; flex-direction: column; gap: 4px; margin: 0 0 12px; }
.field label { font-size: 0.86em; color: var(--muted); font-weight: 600; }
input[type=text], input[type=number], input[type=datetime-local], input[type=date], input[type=time], textarea, select {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; }
textarea { min-height: 120px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.check { display: inline-flex; align-items: center; gap: 6px; margin: 0 14px 8px 0; font-size: 0.94em; }
button { font: inherit; border-radius: 8px; padding: 8px 14px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); cursor: pointer; }
button:hover { background: var(--soft); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.primary:hover { filter: brightness(1.08); }
button.ghost { background: transparent; }
button.copy-btn { font-size: 0.82em; padding: 4px 10px; }
button.copy-btn.done { color: var(--ok); border-color: var(--ok); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 6px 0 4px; }
.result { background: var(--soft); border-radius: 10px; padding: 12px 14px; margin: 12px 0 0; word-break: break-all; }
.result.big { font-size: 1.35em; font-weight: 700; }
.result-grid { display: grid; grid-template-columns: minmax(120px, 1fr) 2fr; gap: 6px 12px; margin: 0; }
.result-grid dt { color: var(--muted); font-size: 0.9em; }
.result-grid dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.result-grid dd span { overflow-wrap: anywhere; }
.error { color: var(--err); font-size: 0.92em; margin: 6px 0 0; min-height: 1.4em; }
.hint { color: var(--muted); font-size: 0.85em; }
.ok { color: var(--ok); }

/* lists / cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 0 0 24px; padding: 0; list-style: none; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.card a.t { font-weight: 700; color: var(--ink); display: block; margin-bottom: 4px; }
.card p { margin: 0; font-size: 0.88em; color: var(--muted); }
.card .cat { font-size: 0.75em; color: var(--accent); }
.related { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.related li a { display: inline-block; padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); font-size: 0.9em; }
.ad { margin: 20px 0; min-height: 0; text-align: center; }
.ad .hint { margin: 0; }
.faq h3 { font-weight: 600; }
.updated { font-size: 0.8em; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 0.86em; padding: 20px 0; margin-top: 24px; }
.site-footer p { margin: 0 0 6px; }
@media (max-width: 480px) { h1 { font-size: 1.3em; } .tool { padding: 14px; } .result-grid { grid-template-columns: 1fr; } .result-grid dt { margin-top: 6px; } }

.shop-box { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 4px 16px 10px; margin: 24px 0; }
.shop-box h2 { font-size: 1.02em; border-left: 0; padding-left: 0; margin: 12px 0 4px; }
.shop-box ul { margin: 6px 0 4px; padding-left: 1.2em; }
.pr-label { display: inline-block; font-size: .72em; font-weight: 600; color: var(--muted, #666); border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; margin-right: 8px; vertical-align: 2px; }