:root{color-scheme:light;--bg:#fbfaf7;--card:#ffffff;--ink:#14161c;--ink2:#4b5060;--line:#e3e1db}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--bg:#16171a;--card:#1f2024;--ink:#f1efe9;--ink2:#b9b6ad;--line:#33343a}}
:root[data-theme="dark"]{color-scheme:dark;--bg:#16171a;--card:#1f2024;--ink:#f1efe9;--ink2:#b9b6ad;--line:#33343a}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 -apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Hiragino Sans","Segoe UI",system-ui,sans-serif;word-break:keep-all;overflow-wrap:anywhere}
main{max-width:760px;margin:0 auto;padding:20px 16px 56px}
h1{font-size:30px;line-height:1.3;margin:8px 0 4px}h2{font-size:20px;margin:36px 0 12px}
a{color:var(--accent)}@media (prefers-color-scheme:dark){a{filter:brightness(1.6)}}
.crumbs,.updated,.muted{color:var(--ink2);font-size:14px}.lead{font-size:18px}
.badge{display:inline-block;padding:1px 8px;border-radius:999px;background:var(--accent);color:#fff;font-size:12px;filter:none}
.glance-grid{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start}
.spec{flex:1 1 320px;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.spec th,.spec td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:15px}
.spec th{width:38%;color:var(--ink2);font-weight:600}
.diagram{margin:0;flex:0 1 auto;text-align:center}.diagram svg{max-width:100%;height:auto}
.diagram .frame{fill:var(--card);stroke:var(--ink);stroke-width:2}.diagram .head{fill:var(--line)}
.diagram .dim{stroke:var(--accent);stroke-width:2}.diagram .lbl{fill:var(--ink2);font-size:13px}
.diagram figcaption{font-size:13px;color:var(--ink2)}
.rules li,.prose li{margin:6px 0}.faq dt{font-weight:700;margin-top:16px}.faq dd{margin:4px 0 0}
.steps-grid{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start}.steps-grid ol{flex:1 1 360px;margin:0}
.shot{width:220px;height:auto;border-radius:22px;border:1px solid var(--line)}
.app{margin-top:36px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.app .shot{float:right;width:120px;margin:0 0 8px 12px;border-radius:14px}.app::after{content:"";display:block;clear:both}
.cta{font-weight:700}.sources li{margin:6px 0;font-size:15px}.index li{margin:8px 0}
footer{max-width:760px;margin:0 auto;padding:0 16px 32px;color:var(--ink2);font-size:13px}
@media (max-width:520px){h1{font-size:25px}.shot{width:100%;max-width:300px}.app .shot{width:96px}}