/* site.css - FDP Tools website.  Hand-written, no framework: one reading
   column, light and dark themes from the system setting, no JavaScript. */

:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --fg: #17212b;
  --muted: #5b6b79;
  --rule: #d9e1e8;
  --accent: #1c5d7a;
  --accent-soft: #e4eef3;
  --code-bg: #eef2f5;
  --note-bg: #fbf3df;
  --note-rule: #c99a2e;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f161c;
    --surface: #16212a;
    --fg: #e2e9ef;
    --muted: #94a5b4;
    --rule: #2b3946;
    --accent: #72b8d6;
    --accent-soft: #17303c;
    --code-bg: #1c2832;
    --note-bg: #2c2412;
    --note-rule: #c9a14a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 var(--font); }
img { max-width: 100%; height: auto; }
a { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

.skip { position: absolute; left: -999px; top: 0; background: var(--surface); padding: 8px 12px; }
.skip:focus { left: 8px; top: 8px; z-index: 10; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--rule); }
.bar { max-width: 1040px; margin: 0 auto; padding: 12px 16px; display: flex; flex-wrap: wrap;
       align-items: center; gap: 8px 24px; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--fg); text-decoration: none; display: flex;
         align-items: center; gap: 8px; }
.mark { background: var(--accent); color: var(--surface); border-radius: 6px; padding: 2px 7px;
        font-size: .85rem; letter-spacing: .04em; }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 4px; }
nav a { display: block; padding: 4px 10px; border-radius: 6px; color: var(--fg); text-decoration: none;
        font-size: .95rem; }
nav a:hover { background: var(--accent-soft); }
nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.content { max-width: 1040px; margin: 0 auto; padding: 28px 16px 56px; }
.content > * { max-width: 78ch; }
.content > .wide, .content > .table-wrap, .content > pre, .content > .cards, .content > figure { max-width: none; }

h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); line-height: 1.15; margin: 0 0 12px; letter-spacing: -.01em; }
h2 { font-size: 1.45rem; margin: 40px 0 10px; padding-top: 8px; border-top: 1px solid var(--rule); }
h3 { font-size: 1.12rem; margin: 26px 0 8px; }
p, ul, ol { margin: 0 0 14px; }
li { margin: 3px 0; }
.lead { font-size: 1.15rem; color: var(--muted); }

code { font-family: var(--mono); font-size: .9em; background: var(--code-bg); padding: 1px 5px;
       border-radius: 4px; overflow-wrap: anywhere; }
pre { background: var(--code-bg); border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px;
      overflow-x: auto; line-height: 1.45; font-size: .88rem; margin: 0 0 16px; }
pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }

.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface);
              margin: 0 0 18px; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: 8px 12px; border-bottom: 1px solid var(--rule); }
tr:last-child td { border-bottom: 0; }
th { background: var(--accent-soft); font-size: .8rem; letter-spacing: .05em; text-transform: uppercase;
     color: var(--muted); }

.note { background: var(--note-bg); border-left: 4px solid var(--note-rule); border-radius: 6px;
        padding: 10px 14px; margin: 0 0 16px; }
.note > :last-child { margin-bottom: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin: 18px 0 24px; }
.card { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 14px 16px; }
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card a.more { display: inline-block; margin-top: 8px; font-weight: 600; text-decoration: none; }

figure { margin: 8px 0 22px; }
figure img { border: 1px solid var(--rule); border-radius: 8px; display: block; }
figcaption { color: var(--muted); font-size: .9rem; margin-top: 6px; }

.toc { background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; padding: 10px 16px; }
.toc ul { margin: 0; padding-left: 18px; }

.site-footer { border-top: 1px solid var(--rule); color: var(--muted); font-size: .9rem; }
.site-footer p { max-width: 1040px; margin: 0 auto; padding: 16px; }

@media (max-width: 560px) {
  body { font-size: 15px; }
  .content { padding-top: 20px; }
  th, td { padding: 7px 9px; }
}