:root {
  --bg: #f7f5ef;
  --paper: #fffdf8;
  --ink: #1f2421;
  --ink-2: #4c534e;
  --ink-3: #7a807b;
  --rule: #dcd8cc;
  --rule-strong: #b9b4a5;
  --accent: #1f5c4a;
  --accent-soft: #e4efe9;
  --warn: #8a4b14;
  --warn-soft: #f6ead9;
  --mark: #fff1b8;
  --radius: 6px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --num: "SF Mono", "Menlo", "Consolas", "Noto Sans Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161917; --paper: #1d211f; --ink: #e8e6df; --ink-2: #b8bcb6; --ink-3: #8b918c;
    --rule: #333935; --rule-strong: #4a514c; --accent: #7cc4a8; --accent-soft: #20342c;
    --warn: #e0a76a; --warn-soft: #3a2c1d; --mark: #4a4220; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #161917; --paper: #1d211f; --ink: #e8e6df; --ink-2: #b8bcb6; --ink-3: #8b918c;
  --rule: #333935; --rule-strong: #4a514c; --accent: #7cc4a8; --accent-soft: #20342c;
  --warn: #e0a76a; --warn-soft: #3a2c1d; --mark: #4a4220; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.85; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--paper); padding: 4px 8px; z-index: 10; }

/* header / footer */
.site-header { border-bottom: 1px solid var(--rule); background: var(--paper); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: .04em; display: inline-flex; align-items: center; gap: 8px; }
.brand-mark { display: inline-grid; place-items: center; width: 26px; height: 26px; border: 1.5px solid var(--ink); border-radius: 4px; font-family: var(--num); font-size: 14px; }
.nav { display: flex; gap: 16px; font-size: 14px; flex-wrap: wrap; }
.nav a { color: var(--ink-2); text-decoration: none; }
.nav a:hover { color: var(--accent); }
.site-footer { margin-top: 64px; border-top: 1px solid var(--rule); background: var(--paper); padding: 24px 0 40px; font-size: 13px; color: var(--ink-3); }
.foot-nav { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 8px 0; }
.foot-nav a { color: var(--ink-2); }
.foot-tag { margin: 0; color: var(--ink-2); }
.foot-note { margin: 8px 0 0; }

/* typography */
main { padding-top: 24px; }
h1 { font-size: 26px; line-height: 1.45; margin: 8px 0 16px; letter-spacing: .01em; }
h2 { font-size: 20px; line-height: 1.5; margin: 44px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--ink); }
h3 { font-size: 17px; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 16px; }
li { margin-bottom: 4px; }
.lead { font-size: 17px; color: var(--ink-2); }
.updated { font-size: 13px; color: var(--ink-3); margin: 0 0 4px; }
small, .note { font-size: 13px; color: var(--ink-3); }
.num { font-family: var(--num); font-variant-numeric: tabular-nums; }
mark { background: var(--mark); color: inherit; padding: 0 2px; }

/* PR bar & boxes */
.pr-bar { font-size: 12.5px; line-height: 1.7; color: var(--ink-2); background: var(--paper); border: 1px solid var(--rule); border-left: 3px solid var(--ink-3); padding: 8px 12px; margin: 0 0 16px; border-radius: var(--radius); }
.pr-bar strong { display: inline-block; font-size: 11px; border: 1px solid var(--ink-3); padding: 0 5px; margin-right: 6px; border-radius: 3px; }
.box { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px; margin: 0 0 20px; }
.box > :last-child { margin-bottom: 0; }
.box-conclusion { border-left: 4px solid var(--accent); }
.box-warn { background: var(--warn-soft); border-color: transparent; color: var(--ink); }
.box-title { font-weight: 700; margin-bottom: 6px; }
.placeholder { background: var(--mark); outline: 1px dashed var(--warn); padding: 2px 4px; }

/* tables (ledger) */
.table-wrap { overflow-x: auto; margin: 0 0 8px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--paper); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; white-space: nowrap; }
td.wrap-cell, th.wrap-cell { white-space: normal; min-width: 160px; }
thead th { background: var(--bg); font-weight: 700; color: var(--ink-2); font-size: 13px; border-bottom: 1px solid var(--rule-strong); }
td.r, th.r { text-align: right; font-family: var(--num); font-variant-numeric: tabular-nums; }
tbody tr:last-child td { border-bottom: 0; }
tr.best td { background: var(--accent-soft); }
.table-cap { font-size: 12.5px; color: var(--ink-3); margin: 0 0 20px; }

/* lists */
.list { list-style: none; padding: 0; margin: 0 0 24px; border-top: 1px solid var(--rule); }
.list li { border-bottom: 1px solid var(--rule); margin: 0; }
.list a { display: block; padding: 14px 0 2px; text-decoration: none; color: var(--ink); }
.list a:hover .li-title { color: var(--accent); }
.li-title { display: block; font-weight: 700; }
.li-desc { display: block; font-size: 14px; color: var(--ink-2); }
.list time { display: block; font-size: 12px; color: var(--ink-3); padding-bottom: 12px; }

/* home */
.hero { padding: 16px 0 8px; }
.hero h1 { font-size: 28px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin: 0 0 24px; }
.card { display: block; background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px; text-decoration: none; color: var(--ink); }
.card:hover { border-color: var(--accent); }
.card-k { font-size: 12px; color: var(--accent); font-weight: 700; letter-spacing: .06em; }
.card-t { display: block; font-weight: 700; font-size: 17px; margin: 4px 0; }
.card-d { display: block; font-size: 14px; color: var(--ink-2); }

/* forms & tools */
.tool { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px; margin: 0 0 24px; }
.field { margin: 0 0 14px; }
.field label, .field .label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.field .hint { font-size: 12.5px; color: var(--ink-3); margin: 2px 0 0; }
input[type="number"], input[type="text"], select { font: inherit; font-family: var(--num); width: 100%; max-width: 280px; padding: 8px 10px; border: 1px solid var(--rule-strong); border-radius: 4px; background: var(--bg); color: var(--ink); }
input:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.row { display: flex; gap: 16px; flex-wrap: wrap; }
.row > .field { flex: 1 1 200px; }
.checks { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.checks label { font-weight: 400; display: inline-flex; gap: 6px; align-items: center; font-size: 14px; }
.btn { font: inherit; font-size: 14px; font-weight: 700; padding: 8px 14px; border-radius: 4px; border: 1px solid var(--accent); background: var(--accent); color: var(--paper); cursor: pointer; }
.btn-ghost { background: transparent; color: var(--accent); }
.btn + .btn { margin-left: 8px; }
.result { margin-top: 8px; }
.result h3 { margin-top: 8px; }
.bar { height: 10px; background: var(--accent); border-radius: 2px; min-width: 2px; }
.bar-cell { width: 40%; min-width: 120px; }
.offer { margin: 16px 0 0; padding: 12px 14px; border: 1px dashed var(--rule-strong); border-radius: var(--radius); font-size: 14px; }
.offer .pr-tag { font-size: 11px; border: 1px solid var(--ink-3); color: var(--ink-3); padding: 0 5px; border-radius: 3px; margin-right: 6px; }

/* article bits */
.toc { font-size: 14px; }
.toc ol { margin: 0; padding-left: 20px; }
.fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 0 0 20px; }
.fit .box { margin: 0; }
.fit h3 { margin-top: 0; font-size: 15px; }
.sources { font-size: 13px; color: var(--ink-2); }
.sources li { word-break: break-all; }

@media (max-width: 520px) {
  body { font-size: 15.5px; }
  h1 { font-size: 22px; }
  .hero h1 { font-size: 23px; }
  h2 { font-size: 18px; }
  .nav { gap: 12px; font-size: 13px; }
}