:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #5b6573;
  --line: #e3e0d8;
  --accent: #1f5fbf;
  --accent-dark: #174a96;
  --accent-soft: #eaf1fb;
  --warn: #9a4a00;
  --warn-soft: #fff5e8;
  --ok: #1d6b45;
  --ad: #6b4e00;
  --ad-soft: #fff8e1;
  --radius: 10px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.8; font-size: 16px; }
a { color: var(--accent); }
a:hover { color: var(--accent-dark); }
img, svg { max-width: 100%; height: auto; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 4px 8px; z-index: 10; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-top: 12px; padding-bottom: 12px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: .95rem; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 2px 0; }
.site-nav a[aria-current="page"] { color: var(--text); font-weight: 700; border-bottom: 2px solid var(--accent); }

main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 1.7rem; line-height: 1.4; margin: .4em 0 .6em; }
h2 { font-size: 1.3rem; line-height: 1.5; margin: 2em 0 .6em; padding-bottom: .3em; border-bottom: 1px solid var(--line); }
h3 { font-size: 1.08rem; margin: 1.6em 0 .4em; }
p, ul, ol, table { margin: .6em 0 1em; }
.lead { font-size: 1.08rem; color: var(--muted); }
.small { font-size: .85rem; color: var(--muted); }
.note { font-size: .9rem; color: var(--muted); }
code, pre { font-family: "Consolas", "BIZ UDGothic", monospace; font-size: .92em; }
pre { background: #f3f1ec; border: 1px solid var(--line); border-radius: 6px; padding: 12px 14px; overflow-x: auto; line-height: 1.6; }
:not(pre) > code { background: #f3f1ec; padding: 1px 5px; border-radius: 4px; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
thead th { background: #f3f1ec; }
.table-scroll { overflow-x: auto; }

.hero { padding: 28px 0 8px; }
.hero h1 { font-size: 2rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 18px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.card h3 { margin-top: 0; }
.card p { margin-bottom: .4em; font-size: .95rem; }
.card .more { font-weight: 700; }

.btn { display: inline-block; border: 1px solid var(--accent); background: var(--accent); color: #fff; border-radius: 8px; padding: 9px 18px; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; line-height: 1.4; }
.btn:hover { background: var(--accent-dark); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--accent); }
.btn-secondary:hover { background: var(--accent-soft); color: var(--accent-dark); }
.btn[disabled], .btn[aria-disabled="true"] { background: #c9ced6; border-color: #c9ced6; color: #fff; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 12px 0; }
.btn-row.center { justify-content: center; }
.config-note { font-size: .88rem; color: var(--warn); background: var(--warn-soft); padding: 6px 10px; border-radius: 6px; }

.box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin: 16px 0; }
.box-info { background: var(--accent-soft); border-color: #c9dbf3; }
.box-warn { background: var(--warn-soft); border-color: #f1d3ad; }
.next-step { background: var(--surface); border: 2px solid var(--accent-soft); border-left: 6px solid var(--accent); border-radius: var(--radius); padding: 14px 18px; margin: 28px 0; }
.next-step h2, .next-step h3 { margin-top: 0; border: 0; font-size: 1.05rem; }
.fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.fit > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; }
.fit h3 { margin-top: 0; }
figure { margin: 16px 0; }
figure img { display: block; max-width: min(100%, 680px); margin: 0 auto; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
figcaption { font-size: .85rem; color: var(--muted); }

/* 広告表示 */
.ad-block { background: var(--ad-soft); border: 1px solid #ecd9a0; border-radius: var(--radius); padding: 12px 16px; margin: 20px 0; }
.ad-label { display: inline-block; font-size: .8rem; font-weight: 700; color: var(--ad); border: 1px solid var(--ad); border-radius: 4px; padding: 0 6px; margin-right: 6px; }

/* ツール */
.tool { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 20px 20px; margin: 16px 0 28px; }
.tool h2 { margin-top: 1.1em; }
.dropzone { border: 2px dashed #b9c4d4; border-radius: var(--radius); padding: 18px; text-align: center; background: #fafcff; }
.dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.dropzone p { margin: 0 0 10px; color: var(--muted); }
.file-label input[type=file] { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file-label:focus-within { outline: 3px solid #9cc0f0; }
.privacy-note { font-size: .9rem; color: var(--ok); background: #eef8f2; border-radius: 6px; padding: 6px 10px; }
.tool-error { color: #8a1c1c; background: #fdeeee; border: 1px solid #f2c4c4; border-radius: 6px; padding: 8px 12px; }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 10px 24px; }
.settings-grid label, .settings-grid fieldset { display: block; }
.settings-grid select, .settings-grid input[type=text], textarea { font: inherit; width: 100%; padding: 6px 8px; border: 1px solid #c3c9d2; border-radius: 6px; background: #fff; }
fieldset { border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px 10px; margin: 0; }
.check { display: block; }
textarea { min-height: 120px; font-family: "Consolas", monospace; font-size: .9rem; }
.chart { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; background: #fff; margin: 8px 0; min-height: 60px; }
.chart svg { display: block; width: 100%; height: auto; }
.warnings { padding-left: 1.2em; }
.warnings li { margin: 4px 0; }
.w-warn { color: var(--warn); }
.warn-head { font-weight: 700; margin-bottom: 0; }
.ok { color: var(--ok); }
table.summary td, table.summary th { white-space: nowrap; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 18px 0 28px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 0 0 6px; }

@media (max-width: 600px) {
  body { font-size: 15.5px; }
  h1, .hero h1 { font-size: 1.45rem; }
  .tool { padding: 4px 12px 14px; }
}
@media print {
  .site-header, .site-footer, .dropzone, .btn-row, .next-step { display: none; }
}