/* brainGO — mobile-first, senior-friendly (large touch, high contrast, no hamburger) */
:root {
  --bg: #0f1220;
  --panel: #171b2e;
  --ink: #f5f7ff;
  --muted: #aab2d5;
  --accent: #ffd84d;
  --accent2: #4dabff;
  --line: #2a3050;
  --maxw: 760px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 19px/1.85 -apple-system, "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}
a { color: var(--accent2); }
.site-header {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; background: rgba(15,18,32,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 800; font-size: 22px; color: var(--ink); text-decoration: none; letter-spacing: .5px; }
.brand span { color: var(--accent); }
.site-nav { display: flex; gap: 18px; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 17px; white-space: nowrap; padding: 8px 4px; }
.site-nav a:hover { color: var(--ink); }
main.prose { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 80px; }
main.prose > p, main.prose .prose-body p { margin: 0 0 1.5em; }
main.prose p { margin: 0 0 1.5em; }
main.prose ul, main.prose ol { margin: 0 0 1.5em; padding-left: 1.4em; }
main.prose li { margin-bottom: .6em; }
.hero { text-align: center; padding: 40px 0 32px; }
.hero h1 { font-size: clamp(28px, 6vw, 40px); margin: 0 0 10px; line-height: 1.2; }
.tagline { color: var(--muted); font-size: 19px; margin: 0 0 24px; }
.cta {
  display: inline-block; background: var(--accent); color: #1a1300;
  font-weight: 700; font-size: 20px; padding: 16px 34px; border-radius: 16px;
  text-decoration: none; min-height: 56px; line-height: 1.4;
}
h1, h2, h3 { line-height: 1.3; }
h1.page-title { font-size: clamp(24px, 5vw, 34px); margin: 0 0 1.2em; line-height: 1.2; }
h2 { margin-top: 2.8em; margin-bottom: 1em; border-bottom: 1px solid var(--line); padding-bottom: .4em; }
h3 { margin-top: 2.2em; margin-bottom: .7em; }
p, li { font-size: 19px; }
code, pre { background: var(--panel); border-radius: 8px; }
code { padding: 2px 6px; }
pre { padding: 14px; overflow-x: auto; }
blockquote { border-left: 4px solid var(--accent2); margin: 1.6em 0; padding: .8em 1.2em; color: var(--muted); background: var(--panel); border-radius: 0 8px 8px 0; }
table { border-collapse: collapse; width: 100%; margin: 0 0 1.6em; }
th, td { border: 1px solid var(--line); padding: 12px; text-align: left; }
th { background: var(--panel); }
hr { border: none; border-top: 1px solid var(--line); margin: 2.6em 0; }
/* 術語對照表 box（每篇觀念文必備） */
main.prose table.terms { font-size: 17px; }
main.prose table.terms th { width: 22%; }
/* 相關連結 cluster */
main.prose h2 + p + ul, main.prose .related { margin-top: 1em; }
.site-footer { border-top: 1px solid var(--line); padding: 20px; text-align: center; color: var(--muted); font-size: 15px; }
.site-footer a { color: var(--muted); }
@media (max-width: 420px) { body { font-size: 17px; } .cta { font-size: 18px; padding: 14px 26px; } }