/* =========================================================
   ostrader.com — shared stylesheet
   Last updated: 2026-10-15
   License: MIT (or whatever you license as; do not strip credit)
   Design goals: server-rendered HTML, no JS framework,
                 fast paint, accessible, print-friendly
   ========================================================= */

:root {
  --c-bg: #ffffff;
  --c-bg-soft: #f6f7f9;
  --c-fg: #0f172a;
  --c-fg-soft: #475569;
  --c-border: #e2e8f0;
  --c-link: #1d4ed8;
  --c-link-hover: #1e40af;
  --c-accent: #0ea5e9;
  --c-warn-bg: #fff7ed;
  --c-warn-border: #fdba74;
  --c-warn-fg: #9a3412;
  --c-good-bg: #ecfdf5;
  --c-good-border: #6ee7b7;
  --c-good-fg: #065f46;
  --c-bad-bg: #fef2f2;
  --c-bad-border: #fca5a5;
  --c-bad-fg: #991b1b;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --max: 1100px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Monaco", "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-fg);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-link); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { color: var(--c-link-hover); border-bottom-color: var(--c-link-hover); }
a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; border-radius: 2px; }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { line-height: 1.25; color: var(--c-fg); margin: 1.6em 0 .6em; }
h1 { font-size: 2.1rem; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; letter-spacing: -0.01em; border-bottom: 1px solid var(--c-border); padding-bottom: .3em; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }
p, ul, ol { margin: 0 0 1em; }
ul, ol { padding-left: 1.4em; }
li { margin-bottom: .25em; }
hr { border: 0; border-top: 1px solid var(--c-border); margin: 2em 0; }

code { font-family: var(--font-mono); font-size: .9em; background: var(--c-bg-soft); padding: .12em .4em; border-radius: 4px; }
pre { background: #0f172a; color: #f1f5f9; padding: 1em; border-radius: var(--radius); overflow-x: auto; font-size: .9rem; }
pre code { background: none; color: inherit; padding: 0; }

blockquote { margin: 1em 0; padding: .5em 1em; border-left: 4px solid var(--c-accent); background: var(--c-bg-soft); color: var(--c-fg-soft); }

table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .95rem; }
th, td { text-align: left; padding: .55em .7em; border-bottom: 1px solid var(--c-border); vertical-align: top; }
th { background: var(--c-bg-soft); font-weight: 600; }
tr:hover td { background: var(--c-bg-soft); }
caption { caption-side: top; padding: .5em 0; color: var(--c-fg-soft); font-style: italic; font-size: .9em; text-align: left; }

/* layout */
.container { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
.site-header { border-bottom: 1px solid var(--c-border); background: var(--c-bg); position: sticky; top: 0; z-index: 10; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 1.25em; padding: .55em 0; }
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; color: var(--c-fg); border-bottom: 0; }
.brand .brand-dot { color: var(--c-accent); }
nav.primary { display: flex; gap: 1.1em; flex-wrap: nowrap; white-space: nowrap; }
nav.primary a { color: var(--c-fg-soft); font-size: .92rem; border-bottom: 0; padding: .15rem 0; }
nav.primary a:hover, nav.primary a[aria-current="page"] { color: var(--c-fg); }
.brand { font-size: 1.05rem; }

main { padding: 2em 0 4em; }
footer.site-footer { border-top: 1px solid var(--c-border); padding: 2em 0; color: var(--c-fg-soft); font-size: .9em; background: var(--c-bg-soft); }
footer.site-footer .container { display: flex; flex-wrap: wrap; gap: 1.5em; justify-content: space-between; }
footer.site-footer a { color: var(--c-fg-soft); }
footer.site-footer a:hover { color: var(--c-fg); }

/* article header */
.article-meta { color: var(--c-fg-soft); font-size: .9rem; margin: -.4em 0 1.6em; display: flex; flex-wrap: wrap; gap: .9em; align-items: center; }
.article-meta time { font-weight: 500; }
.article-meta .verified { background: var(--c-good-bg); color: var(--c-good-fg); padding: .1em .55em; border-radius: 4px; font-size: .8rem; font-weight: 600; }
.author-byline { display: flex; align-items: center; gap: .7em; margin: 0 0 1.5em; padding: .8em 1em; background: var(--c-bg-soft); border-radius: var(--radius); border: 1px solid var(--c-border); }
.author-byline .avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--c-accent), var(--c-link)); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 1rem; flex-shrink: 0; }
.author-byline .name { font-weight: 600; }
.author-byline .role { font-size: .85rem; color: var(--c-fg-soft); }

/* callouts */
.callout { padding: 1em 1.1em; border-radius: var(--radius); border: 1px solid var(--c-border); margin: 1.2em 0; }
.callout.warn { background: var(--c-warn-bg); border-color: var(--c-warn-border); color: var(--c-warn-fg); }
.callout.good { background: var(--c-good-bg); border-color: var(--c-good-border); color: var(--c-good-fg); }
.callout.bad { background: var(--c-bad-bg); border-color: var(--c-bad-border); color: var(--c-bad-fg); }
.callout strong { color: inherit; }

/* tool / widget */
.tool-card { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 1.4em; box-shadow: var(--shadow); margin: 1.4em 0; }
.tool-card h2:first-child, .tool-card h3:first-child { margin-top: 0; }
.field { display: block; margin-bottom: .9em; }
.field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .25em; color: var(--c-fg-soft); }
.field input, .field select, .field textarea { width: 100%; padding: .55em .7em; border: 1px solid var(--c-border); border-radius: 6px; font: inherit; background: var(--c-bg); color: var(--c-fg); }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--c-accent); outline-offset: 1px; border-color: var(--c-accent); }
.field .hint { font-size: .8rem; color: var(--c-fg-soft); margin-top: .2em; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 1em; }
@media (max-width: 600px) { .row { grid-template-columns: 1fr; } }

.btn { display: inline-block; padding: .55em 1.1em; border: 1px solid transparent; border-radius: 6px; font: inherit; font-weight: 600; cursor: pointer; background: var(--c-fg); color: var(--c-bg); border-bottom: 0; }
.btn:hover { background: var(--c-link); color: #fff; }
.btn.secondary { background: var(--c-bg); color: var(--c-fg); border-color: var(--c-border); }
.btn.secondary:hover { background: var(--c-bg-soft); color: var(--c-fg); border-color: var(--c-fg-soft); }
.btn-row { display: flex; gap: .6em; flex-wrap: wrap; margin: 1em 0; }

/* table variants */
.tco-table th.num, .tco-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.tco-table tr.highlight td { background: #fef9c3; font-weight: 600; }
.tco-table .winner { color: var(--c-good-fg); font-weight: 600; }
.tco-table .loser { color: var(--c-bad-fg); }

/* badges */
.badge { display: inline-block; padding: .1em .55em; border-radius: 4px; font-size: .75rem; font-weight: 600; letter-spacing: .02em; }
.badge.cheap { background: var(--c-good-bg); color: var(--c-good-fg); }
.badge.warn { background: var(--c-warn-bg); color: var(--c-warn-fg); }
.badge.neutral { background: var(--c-bg-soft); color: var(--c-fg-soft); }
.badge.dead { background: #1f2937; color: #f9fafb; }

/* breadcrumb */
.breadcrumb { font-size: .85rem; color: var(--c-fg-soft); margin: -.6em 0 1.4em; }
.breadcrumb a { color: var(--c-fg-soft); }
.breadcrumb a:hover { color: var(--c-fg); }
.breadcrumb .sep { margin: 0 .4em; opacity: .6; }

/* disclosure pill (sticky bottom-right on tool pages) */
.disclosure-pill { position: fixed; bottom: 1em; right: 1em; background: var(--c-fg); color: var(--c-bg); padding: .55em .9em; border-radius: 999px; font-size: .8rem; box-shadow: var(--shadow); z-index: 50; }
.disclosure-pill a { color: inherit; border-bottom: 1px solid currentColor; }

/* skip link */
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1em; top: 1em; background: var(--c-fg); color: var(--c-bg); padding: .5em 1em; border-radius: 4px; z-index: 100; }

/* print */
@media print {
  nav, footer, .disclosure-pill, .no-print { display: none !important; }
  body { font-size: 11pt; color: #000; }
  a { color: #000; text-decoration: underline; }
  .tool-card { box-shadow: none; border: 1px solid #000; }
}

/* responsive */
@media (max-width: 720px) {
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.25rem; }
  .container { padding: 0 1em; }
  main { padding: 1.5em 0 3em; }
  .site-header .container { flex-direction: column; align-items: flex-start; gap: .35em; padding: .5em 0; }
  nav.primary { gap: .8em 1em; flex-wrap: wrap; white-space: normal; }
  nav.primary a { font-size: .85rem; }
  .brand { font-size: 1rem; }
}

/* focus state for keyboard users */
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }