/* Layout: one reading column; sticky bar to jump between the two blocks; each question a numbered row, options in a 2-up grid on wide screens */
:root{
  --paper:#f5f7f8; --surface:#ffffff; --ink:#18232b; --muted:#5b6a74; --line:#d9e1e5;
  --accent:#0e7470; --accent-soft:#e1f1ef; --wave:#9cc9c5;
  --f-display:"Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body:"Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --f-mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#11181d; --surface:#18222a; --ink:#e6edf0; --muted:#97a7b0; --line:#2a3943;
  --accent:#4fc2bb; --accent-soft:#16312f; --wave:#2d5c59; color-scheme:dark }}
:root[data-theme="dark"]{
  --paper:#11181d; --surface:#18222a; --ink:#e6edf0; --muted:#97a7b0; --line:#2a3943;
  --accent:#4fc2bb; --accent-soft:#16312f; --wave:#2d5c59; color-scheme:dark }

html,body{min-height:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:17px;line-height:1.5}
.wrap{max-width:780px;margin:0 auto;padding-left:max(16px, env(safe-area-inset-left, 0px));padding-right:max(16px, env(safe-area-inset-right, 0px))}

header.hero{padding-block:48px 8px}
.eyebrow{font-family:var(--f-mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 12px}
h1{font-family:var(--f-display);font-weight:800;font-size:clamp(32px,6vw,52px);line-height:1.05;letter-spacing:-.02em;margin:0 0 16px;text-wrap:balance}
.lead{font-size:18px;max-width:60ch;margin:0;color:var(--ink)}
.lead strong{color:var(--accent)}
.lead a{color:var(--accent)}
.wave{display:block;width:100%;height:56px;margin-top:28px}
.wave path{fill:none;stroke:var(--wave);stroke-width:2}

body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top, 0px);z-index:10;background:var(--paper)}
nav.bar{position:sticky;top:env(safe-area-inset-top, 0px);z-index:5;background:var(--paper);border-bottom:1px solid var(--line)}
nav.bar .wrap{display:flex;gap:8px;flex-wrap:wrap;padding-block:10px}
nav.bar a{font-family:var(--f-display);font-weight:600;font-size:15px;text-decoration:none;color:var(--ink);padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);display:inline-flex;gap:8px;align-items:baseline}
nav.bar a span{font-family:var(--f-mono);font-size:12px;color:var(--muted)}
nav.bar a:hover,nav.bar a:focus-visible{border-color:var(--accent);outline:none}

section.block{padding-block:40px 24px;scroll-margin-top:64px}
.block-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 16px;margin-bottom:8px}
h2{font-family:var(--f-display);font-weight:800;font-size:clamp(24px,4vw,32px);letter-spacing:-.01em;margin:0;text-wrap:balance}
.count{font-family:var(--f-mono);font-size:13px;color:var(--muted)}
.topics{color:var(--muted);margin:0 0 20px;max-width:62ch}

.q{display:grid;grid-template-columns:auto 1fr;column-gap:16px;padding-block:20px;border-top:1px solid var(--line);scroll-margin-top:64px}
.q h3{display:contents}
.q .n{font-family:var(--f-mono);font-weight:500;font-size:14px;color:var(--accent);padding-top:3px;font-variant-numeric:tabular-nums}
.q .t{font-weight:700;font-size:18px;line-height:1.4;min-width:0}
.opts{grid-column:2;list-style:none;margin:12px 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.opts li{display:flex;gap:10px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-width:0}
.opts .l{font-family:var(--f-mono);font-size:14px;color:var(--accent);background:var(--accent-soft);border-radius:4px;padding:0 6px;line-height:1.6;flex:none}
@media (max-width:560px){.opts{grid-template-columns:1fr}.q{column-gap:10px}}

footer{padding-block:32px 48px;color:var(--muted);font-size:15px;border-top:1px solid var(--line)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}