/* CertConvert website - shared styles. Brand: #4F46E5 indigo (from the app shield). */

/* Keyboard users can jump past the navigation; visible only when focused. */
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 10000;
  background: #4f46e5; color: #fff; padding: 10px 18px;
  border-radius: 0 0 8px 0; font-weight: 600; }
.skip-link:focus { left: 0; }

:root {
  --ink: #4f46e5;
  --ink-hover: #4338ca;
  --accent: #a5b4fc;
  --navy: #1e1b4b;
  --navy-2: #272257;
  --text: #1f2329;
  --text-2: #4a5059;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #ffffff;
  --bg-soft: #f6f6fb;
  --bg-card: #ffffff;
  --bg-code: #1e1b4b;
  --ico-bg: #eef2ff;
  --radius: 10px;
  --maxw: 1080px;
  --warn-bg: #fff7ed;
  --warn-border: #fdba74;
  --warn-text: #9a3412;
  --ok-bg: #ecfdf5;
  --ok-border: #a7f3d0;
  --ok-text: #065f46;
  --header-bg: rgba(255,255,255,0.92);
  --sha-text: var(--text);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #818cf8;
    --ink-hover: #a5b4fc;
    --accent: #a5b4fc;
    --navy: #14122e;
    --navy-2: #1c1940;
    --text: #e7e9f2;
    --text-2: #b7bccb;
    --muted: #8b90a3;
    --border: #2a2e42;
    --bg: #0d0d1a;
    --bg-soft: #14142600;
    --bg-soft: #141426;
    --bg-card: #14142a;
    --bg-code: #08081a;
    --ico-bg: #201d46;
    --warn-bg: #2a1c10;
    --warn-border: #7c4a1e;
    --warn-text: #fbbf7a;
    --ok-bg: #10241d;
    --ok-border: #1f5140;
    --ok-text: #6ee7b7;
    --header-bg: rgba(13,13,26,0.9);
    --sha-text: #dfe2ee;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}
a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; color: var(--text); }
h1 { font-size: 40px; margin: 0 0 16px; letter-spacing: -0.5px; }
h2 { font-size: 28px; margin: 0 0 16px; letter-spacing: -0.3px; }
h3 { font-size: 19px; margin: 0 0 8px; }
p { margin: 0 0 16px; color: var(--text-2); }
img { max-width: 100%; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* Header / nav */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.nav-logo img { height: 30px; display: block; }
.nav-links { display: flex; gap: 22px; margin-left: 8px; flex: 1; }
.nav-links a { color: var(--text-2); font-size: 15px; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-cta { display: flex; gap: 10px; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius);
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text);
  transition: background .12s, border-color .12s, color .12s;
}
.btn:hover { text-decoration: none; background: var(--bg-soft); }
.btn-primary { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-hover); border-color: var(--ink-hover); color: #fff; }
.btn-lg { padding: 14px 26px; font-size: 17px; }
.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn-ghost-light:hover { background: rgba(255,255,255,0.10); color: #fff; }

/* Hero (dark indigo band) */
.hero { background: var(--navy); color: #fff; padding: 80px 0 72px; }
.hero h1 { color: #fff; max-width: 20ch; }
.hero p.lead { font-size: 20px; color: #cdd0ec; max-width: 62ch; margin-bottom: 28px; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hero .sub { color: #9c9fc4; font-size: 14px; margin-top: 18px; }
.hero-shot {
  margin-top: 48px; border-radius: 14px; border: 1px solid rgba(255,255,255,0.12);
  overflow: hidden; background: var(--navy-2);
}

/* Sections */
.section { padding: 72px 0; }
.section-soft { background: var(--bg-soft); }
.section h2 { text-align: center; }
.section .sub { text-align: center; color: var(--muted); max-width: 62ch; margin: 0 auto 40px; }
.eyebrow { text-align: center; color: var(--ink); font-weight: 700; font-size: 13px;
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 10px; }

/* Feature grid / cards */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 22px 22px;
}
.card h3 { display: flex; align-items: center; gap: 9px; }
.card .ico { width: 34px; height: 34px; border-radius: 8px; background: var(--ico-bg); color: var(--ink);
  display: inline-flex; align-items: center; justify-content: center; font-size: 18px; flex: none; }
.card p { margin: 0; font-size: 15px; }

/* Screenshot figures */
.shot {
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--bg-soft);
}
.shot img { display: block; width: 100%; }
figure { margin: 0 0 28px; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; text-align: center; }

/* Download box / tables */
.download-box {
  border: 1px solid var(--border); border-radius: 14px; padding: 28px; background: var(--bg-card);
  max-width: 720px; margin: 0 auto;
}
.dl-row { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 14px 0; font-size: 15px; }
.dl-row .k { color: var(--muted); }
.dl-row .v { color: var(--text); font-weight: 600; }
code, .mono { font-family: "SFMono-Regular", Consolas, "Cascadia Code", monospace; font-size: 13.5px; }
.sha { word-break: break-all; background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; display: block; color: var(--sha-text); }
pre {
  background: var(--bg-code); color: #e2e8f0; border-radius: 10px; padding: 16px 18px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.5;
}
pre code { color: inherit; font-size: inherit; }

/* Callout / warn */
.callout {
  border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; background: var(--bg-soft);
  font-size: 14.5px; margin: 18px 0; color: var(--text-2);
}
.callout-warn { background: var(--warn-bg); border-color: var(--warn-border); color: var(--warn-text); }
.callout-warn a { color: var(--warn-text); text-decoration: underline; }

/* Doc / prose pages */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { font-size: 24px; margin-top: 40px; }
.prose h3 { margin-top: 26px; }
.prose ul, .prose ol { color: var(--text-2); padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose table { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--bg-soft); }
.page-head { padding: 56px 0 8px; }
.page-head h1 { font-size: 34px; }
.page-head .lead { font-size: 18px; color: var(--muted); }

/* Donate / badge / pill */
.kofi { display: inline-flex; align-items: center; gap: 10px; background: #13C3FF; color: #00334d;
  padding: 12px 22px; border-radius: var(--radius); font-weight: 700; }
.kofi:hover { text-decoration: none; filter: brightness(0.97); }
.pill { display: inline-block; background: var(--ico-bg); color: var(--ink); font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; }

/* Footer */
.site-footer { background: var(--navy); color: #cdd0ec; padding: 56px 0 32px; margin-top: 8px; }
.site-footer img { height: 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
.site-footer h4 { color: #fff; font-size: 13px; text-transform: uppercase; letter-spacing: .8px; margin: 0 0 12px; }
.site-footer a { color: #cdd0ec; display: block; margin-bottom: 8px; font-size: 14.5px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); margin-top: 36px; padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: #9c9fc4; font-size: 13.5px; }

/* Responsive */
@media (max-width: 860px) {
  h1 { font-size: 32px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 52px 0; }
}