:root{--page:#F6F5F1;--surface:#FFFFFF;--surface-soft:#EDEFEA;--ink:#202A28;--muted:#596560;--primary:#23665D;--primary-dark:#184B44;--accent:#B27A46;--line:#D9DEDA;--footer:#1B302D;--max:1180px;--article:780px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--page);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden}img{max-width:100%;height:auto;display:block}a{color:var(--primary);text-underline-offset:3px}a:hover{color:var(--primary-dark)}[hidden]{display:none!important}.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:relative;z-index:20}.header-inner{max-width:var(--max);height:68px;margin:auto;padding:0 32px;display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;white-space:nowrap}.brand-logo{height:32px;width:auto;max-width:150px;object-fit:contain}.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:8px;background:var(--primary);color:#fff;font-weight:800}.brand-name{font-size:17px}.desktop-nav{display:flex;align-items:center;gap:18px;flex:1;justify-content:center;min-width:0}.desktop-nav a,.mobile-reading-link{color:var(--ink);text-decoration:none;padding:10px 2px;border-bottom:2px solid transparent}.desktop-nav a:hover,.desktop-nav a[aria-current=page]{color:var(--primary);border-bottom-color:var(--primary)}.header-actions{display:flex;align-items:center;gap:12px}.directory-toggle{min-height:44px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;padding:0 14px;font:inherit;cursor:pointer}.directory-toggle:hover,.directory-toggle[aria-expanded=true]{border-color:var(--primary);background:#F2F7F5}.mobile-directory-toggle{display:none}.directory-panel{position:absolute;left:50%;transform:translateX(-50%);top:68px;width:min(920px,calc(100% - 48px));background:var(--surface);border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 16px 36px rgba(32,42,40,.12);padding:22px}.directory-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.directory-grid h2,.mobile-directory h2,.site-footer h2{font-size:14px;margin:0 0 10px;letter-spacing:.04em}.directory-grid a{display:block;text-decoration:none;border-top:1px solid var(--line);padding:10px 0}.directory-grid strong{display:block;color:var(--ink);font-size:15px}.directory-grid span{display:block;color:var(--muted);font-size:13px;line-height:1.55}.mobile-directory{display:none}.container{max-width:var(--max);margin:auto;padding-left:32px;padding-right:32px}.article-wrap{max-width:var(--article);margin:0 auto}.page-hero{padding:34px 0 22px}.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:8px}.breadcrumbs a{color:var(--muted)}h1{font-size:32px;line-height:1.25;margin:0 0 14px;letter-spacing:-.02em}h2{font-size:24px;line-height:1.35;margin:0 0 14px}h3{font-size:18px;line-height:1.4;margin:0 0 8px}.lead{font-size:17px;color:var(--muted);max-width:780px;margin:0}.rule{border:0;border-top:1px solid var(--line);margin:24px 0 0}.section{padding:56px 0}.section-soft{background:var(--surface-soft)}.eyebrow{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:.12em;margin-bottom:10px}.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 16px;border-radius:10px;background:var(--primary);color:#fff;text-decoration:none;font-weight:700}.button:hover{background:var(--primary-dark);color:#fff}.button.secondary{background:transparent;color:var(--primary);border:1px solid var(--primary)}.hero-grid,.split,.home-motion,.home-city,.home-camera,.home-mobile{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:34px;align-items:center}.home-city,.home-camera{grid-template-columns:minmax(280px,.9fr) minmax(0,1.1fr)}.media-shell{min-width:0}.media-shell img{width:auto;max-width:100%;margin:auto;object-fit:contain}.media-hero img{max-height:250px}.media-normal img{max-height:230px}.media-portrait img{max-width:240px;max-height:340px}.media-icon img{width:56px;max-width:64px}.index-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid var(--line)}.index-item{padding:22px;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}.index-item:nth-child(3n){border-right:0}.index-item .num{display:block;color:var(--accent);font-weight:800;font-size:13px}.index-item a{font-size:18px;font-weight:800;color:var(--ink);text-decoration:none}.index-item p{color:var(--muted);margin:6px 0 0}.prose p{margin:0 0 18px}.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:7px 0}.concepts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:24px 0}.concept{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px}.numbered{counter-reset:step}.numbered>section{counter-increment:step;padding:24px 0;border-top:1px solid var(--line)}.numbered>section h2:before{content:"0" counter(step) " ";color:var(--accent);font-size:14px}.text-index{display:grid;grid-template-columns:1fr 1fr;gap:24px}.text-index a{display:block;padding:12px 0;border-bottom:1px solid var(--line);text-decoration:none;font-weight:700}.bookmark-main{border-left:3px solid var(--accent);padding-left:20px}.bookmark-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:24px}.bookmark-list article{border-top:1px solid var(--line);padding-top:14px}.guide-columns{display:grid;grid-template-columns:1fr 1fr;gap:36px}.guide-list{display:grid;gap:14px}.guide-list article{border-top:1px solid var(--line);padding-top:12px}.method-lines a{display:grid;grid-template-columns:28px 1fr;gap:12px;padding:15px 0;border-top:1px solid var(--line);text-decoration:none}.method-lines b{color:var(--accent)}.article-two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,28%);gap:34px;align-items:start}.aside-note{background:var(--surface-soft);padding:16px;border-radius:12px}.faq details{background:var(--surface);border-top:1px solid var(--line);padding:15px 0}.faq summary{cursor:pointer;font-weight:800;min-height:44px;display:flex;align-items:center}.route{border-top:1px solid var(--line);padding:24px 0}.route-links{display:flex;gap:8px;flex-wrap:wrap}.route-links a{border:1px solid var(--line);background:var(--surface);padding:8px 12px;border-radius:999px;text-decoration:none}.site-footer{background:var(--footer);color:#F4F5F1;margin-top:56px;padding:44px 0 18px}.footer-inner{max-width:var(--max);margin:auto;padding:0 32px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}.site-footer a{display:block;color:#E3F2EE;text-decoration:none;padding:5px 0}.site-footer a:hover{text-decoration:underline}.footer-brand p{color:#D4DFDC;font-size:14px}.footer-bottom{max-width:var(--max);margin:26px auto 0;padding:18px 32px 0;border-top:1px solid rgba(255,255,255,.16);font-size:14px;color:#D4DFDC}.mobile-quickbar{display:none}
@media(max-width:900px){.header-inner,.container,.footer-inner,.footer-bottom{padding-left:24px;padding-right:24px}.desktop-nav{gap:12px}.desktop-nav a:nth-last-child(-n+2){display:none}.hero-grid,.split,.home-motion,.home-city,.home-camera,.home-mobile{grid-template-columns:1fr}.article-two-col{grid-template-columns:1fr}.footer-inner{grid-template-columns:1.3fr 1fr 1fr}}
@media(max-width:767px){body{padding-bottom:calc(58px + env(safe-area-inset-bottom))}.site-header{min-height:60px}.header-inner{height:60px;padding-left:16px;padding-right:16px;gap:10px}.brand-logo{height:27px}.brand-mark{width:28px;height:28px}.brand-name{font-size:15px}.desktop-nav,.desktop-directory-toggle,.mobile-reading-link,.desktop-directory{display:none!important}.mobile-directory-toggle{display:inline-flex}.header-actions{margin-left:auto}.mobile-directory{display:block;background:var(--surface);border-top:1px solid var(--line);padding:12px 16px 20px}.mobile-main-links{display:grid;grid-template-columns:1fr 1fr}.mobile-main-links a,.mobile-directory section a{display:flex;align-items:center;min-height:44px;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}.mobile-directory section{margin-top:14px}.mobile-directory h2{color:var(--muted);margin:0}.container{padding-left:16px;padding-right:16px}.page-hero{padding:26px 0 18px}h1{font-size:27px}h2{font-size:21px}.lead{font-size:16px}.section{padding:36px 0}.hero-grid,.home-motion,.home-city,.home-camera,.home-mobile,.guide-columns,.text-index{grid-template-columns:1fr;gap:22px}.media-hero img{max-height:190px}.media-normal img{max-height:190px}.media-portrait img{max-width:175px;max-height:260px}.media-icon img{width:46px}.index-grid{grid-template-columns:1fr}.index-item{padding:16px 0;border-right:0}.concepts,.bookmark-list{grid-template-columns:1fr}.site-footer{margin-top:36px;padding-bottom:78px}.footer-inner{padding-left:16px;padding-right:16px;grid-template-columns:1fr;gap:22px}.footer-bottom{padding-left:16px;padding-right:16px}.mobile-quickbar{position:fixed;z-index:30;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(4,1fr);min-height:56px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line)}.mobile-quickbar a{display:flex;align-items:center;justify-content:center;min-height:56px;color:var(--ink);font-size:13px;text-decoration:none}.mobile-quickbar a:hover{background:var(--surface-soft)}.btn-row{gap:8px}.button{flex:1 1 auto}.section p{overflow-wrap:anywhere}}
@media(max-width:360px){.brand-name{max-width:112px;overflow:hidden;text-overflow:ellipsis}.button{width:100%}}