/* FastAIBest：系统字体、单栏、无外部请求 */
:root { --bg: #fafbfc; --ink: #14213d; --muted: #5b667a; --line: #e2e6ee; --accent: #1f6feb; --mint: #4cc9a0; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; color: var(--ink); background: var(--bg); font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: #1650b0; }
.top, main, footer { max-width: 760px; margin: 0 auto; padding-left: 1.25rem; padding-right: 1.25rem; }
.top { padding-top: 1rem; display: flex; align-items: center; justify-content: space-between; gap: 0.8rem; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 800; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.top nav { display: flex; gap: 0.2rem; flex-wrap: wrap; }
.top nav a { color: var(--muted); text-decoration: none; padding: 0.4rem 0.75rem; border-radius: 8px; font-weight: 600; font-size: 0.95rem; }
.top nav a:hover, .top nav a[aria-current="page"] { background: #eaeef5; color: var(--ink); }
main { padding-bottom: 3rem; }
article > h1 { font-size: clamp(1.9rem, 5vw, 2.7rem); line-height: 1.12; letter-spacing: -0.01em; margin: 2rem 0 0.8rem; }
article > h1 em { font-style: normal; background: linear-gradient(transparent 62%, rgba(76, 201, 160, 0.45) 62% 92%, transparent 92%); }
article > h1 + p { font-size: 1.1rem; color: var(--muted); }
article h2 { font-size: 1.4rem; margin: 2.4rem 0 0.5rem; }
code { background: #eaeef5; padding: 0.1em 0.35em; border-radius: 5px; font-size: 0.9em; }
.crumb { margin: 1.6rem 0 0; font-size: 0.9rem; color: var(--muted); }
.crumb + h1 { margin-top: 0.6rem; }
.updated { color: var(--muted); font-size: 0.88rem; margin-top: 3rem; }
.empty { background: #fff; border: 1px dashed var(--line); border-radius: 10px; padding: 0.8rem 1rem; color: var(--muted); }
.tool-list { list-style: none; padding: 0; margin: 0.6rem 0; display: grid; gap: 0.6rem; }
.tool-list li { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 0.7rem 1rem; }
.tool-list li > a { font-weight: 700; }
.tool-list li > span { display: block; color: var(--muted); font-size: 0.92rem; }
footer { padding-top: 1.5rem; padding-bottom: 3rem; color: var(--muted); font-size: 0.88rem; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }