:root{--bg:#fff;--fg:#1c1c22;--muted:#5d5d68;--line:#e2e2e8;--accent:#3b5bdb;--card:#f6f6f9;--btn-fg:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#14141a;--fg:#ececf1;--muted:#a0a0ad;--line:#2b2b35;--accent:#8ea2ff;--card:#1d1d26;--btn-fg:#14141a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
a{color:var(--accent)}
.top{border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;height:60px}
.brand{font-weight:700;font-size:1.2rem;color:var(--fg);text-decoration:none}
nav a{margin-left:16px;text-decoration:none}
h1{font-size:clamp(1.7rem,4vw,2.4rem);line-height:1.2;margin:32px 0 12px}
h2{margin-top:32px}
.lead{font-size:1.15rem;color:var(--muted)}
.btn{display:inline-block;background:var(--accent);color:var(--btn-fg);padding:10px 20px;border-radius:8px;text-decoration:none;font-weight:600}
.btn.small{padding:4px 12px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin:24px 0}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px;text-decoration:none;color:var(--fg)}
.card img{width:100%;height:auto;border-radius:8px}
.card h3{font-size:1rem;margin:8px 0 0}
.cover{width:100%;height:auto;border-radius:12px;margin:16px 0}
.crumbs{margin-top:16px;color:var(--muted);font-size:.9rem}
.note{background:var(--card);border-left:4px solid var(--accent);padding:10px 14px}
footer{border-top:1px solid var(--line);margin-top:48px;padding-top:16px;padding-bottom:32px;color:var(--muted);font-size:.9rem}
.fig{margin:20px 0;max-width:100%}
.fig img{max-width:100%;height:auto;border-radius:10px;border:1px solid var(--line);display:block}
.fig figcaption{color:var(--muted);font-size:.9rem;margin-top:6px}
.fig-right{float:right;width:46%;margin:4px 0 16px 24px}
.fig-left{float:left;width:46%;margin:4px 24px 16px 0}
.tool h2{clear:both}
@media (max-width:640px){.fig-right,.fig-left{float:none;width:100%;margin:16px 0}}
.meta{color:var(--muted);font-size:.9rem}
.guide-list{list-style:none;padding:0}
.guide-list li{padding:12px 0;border-bottom:1px solid var(--line)}
.guide-list a{font-weight:600;font-size:1.1rem}