:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1d2733;
  --muted: #5b6776;
  --line: #dfe4ea;
  --accent: #1f4e79;
  --accent-soft: #e8eff6;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1620;
    --surface: #16202c;
    --text: #e6ebf1;
    --muted: #9aa8b8;
    --line: #263444;
    --accent: #8dbbe8;
    --accent-soft: #1b2b3d;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1620;
  --surface: #16202c;
  --text: #e6ebf1;
  --muted: #9aa8b8;
  --line: #263444;
  --accent: #8dbbe8;
  --accent-soft: #1b2b3d;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.68;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 700px; margin: 0 auto; padding: 0 16px; }
a { color: var(--accent); }

header.site { background: var(--surface); border-bottom: 1px solid var(--line); }
header.site .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 16px;
  padding-top: 16px; padding-bottom: 14px;
}
.brand { font-weight: 700; font-size: 1.2rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 0.95rem; }
nav a { text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { text-decoration: underline; }

main.wrap { padding-top: 32px; padding-bottom: 8px; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 8px; letter-spacing: -0.015em; }
h2 { font-size: 1.25rem; margin: 30px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 22px 0 6px; }
p { margin: 0 0 14px; }
.lede { font-size: 1.08rem; }
.meta { color: var(--muted); font-size: 0.88rem; margin: 0 0 22px; }
.tagline { color: var(--muted); margin: 0 0 22px; }

ol, ul { padding-left: 22px; margin: 0 0 14px; }
li { margin-bottom: 6px; }

.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 10px 14px;
  margin: 0 0 16px;
  font-size: 0.97rem;
}
.note p:last-child { margin-bottom: 0; }

.table-wrap { overflow-x: auto; margin: 0 0 16px; }
table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.84rem; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.total td { font-weight: 600; border-bottom: none; }
td .sub { color: var(--muted); font-size: 0.84rem; }

.post-list { list-style: none; padding: 0; margin: 0 0 8px; }
.post-list li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 14px;
}
.post-list .title { font-weight: 600; font-size: 1.08rem; text-decoration: none; }
.post-list a.title { color: var(--accent); }
.post-list a.title:hover { text-decoration: underline; }
.post-list .meta { margin: 2px 0 6px; }
.post-list p { margin: 0; color: var(--muted); font-size: 0.97rem; }

dl { margin: 0 0 16px; }
dt { font-weight: 600; margin-top: 14px; }
dd { margin: 2px 0 0; color: var(--muted); }

.back { display: inline-block; margin-top: 18px; font-size: 0.95rem; }

.hero { padding-bottom: 6px; }
.small { color: var(--muted); font-size: 0.88rem; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
}
.btn:hover { opacity: 0.9; }
.btn-soon { background: var(--accent-soft); color: var(--muted); border: 1px solid var(--line); cursor: default; }
.btn-soon:hover { opacity: 1; }
.btn:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.idea {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px 2px;
  margin-bottom: 12px;
}
.idea-title { font-weight: 600; margin-bottom: 6px; }

h1.slogan { font-size: 2.2rem; line-height: 1.15; margin: 0 0 16px; text-wrap: balance; }
h1.slogan .phrase { display: inline-block; }
.focus { list-style: none; padding: 0; margin: 0 0 8px; }
.focus li { padding: 10px 0; border-bottom: 1px solid var(--line); margin: 0; }
.focus li:last-child { border-bottom: none; }
.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: middle;
}

footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 20px 0 40px; color: var(--muted); font-size: 0.88rem; }
footer p { margin: 0 0 6px; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 1.5rem; }
  th, td { padding: 7px 6px; }
  .post-list li { padding: 14px; }
}