:root{--ink:#212121;--ink-soft:#616161;--ink-mute:#757575;--bg:#fff;--surface:#fafafa;--line:#e0e0e0;--accent:#2962ff;--accent-bg:#f5f5f5}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;font-size:16px;line-height:1.6}
/* WCAG 2.2 SC 1.4.1 (Use of Color): inline links must be distinguishable
   from surrounding text without relying on color alone — always underline. */
a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
a:hover{text-decoration:underline;text-decoration-thickness:2px}
/* Buttons and footer-style links opt out of the underline. */
.back,.no-underline{text-decoration:none}
.wrap{max-width:820px;margin:0 auto;padding:40px 20px 80px}
header{border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:32px}
h1{font-size:1.75rem;font-weight:700;margin:0 0 8px}
.sub{color:var(--ink-soft);margin:0}
h2{font-size:1.2rem;font-weight:700;margin:36px 0 10px;color:var(--ink)}
h3{font-size:1.05rem;font-weight:700;margin:24px 0 8px;color:var(--ink)}
h4{font-size:0.98rem;font-weight:700;margin:18px 0 6px;color:var(--ink)}
p,li{color:var(--ink-soft);margin:0 0 12px}
ul,ol{padding-left:22px;margin:0 0 14px}
ul li,ol li{margin:0 0 6px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:20px 24px;margin:24px 0}
.lead{font-size:1.02rem;color:var(--ink)}
footer{margin-top:48px;padding-top:24px;border-top:1px solid var(--line);color:var(--ink-mute);font-size:0.85rem;text-align:center}
.back{display:inline-block;margin-top:24px;padding:10px 18px;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-weight:600}
strong{color:var(--ink)}
/* Replaces inline `style="margin:0"` attributes — keeps style-src-elem 'self'. */
.no-margin{margin:0}