body[data-install-guide]{height:auto;min-height:100dvh;background:var(--bg)}
.install-header{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:1000px;margin:auto;padding:16px 24px;border-bottom:1px solid var(--line)}
.install-brand{color:var(--fg);font:700 18px var(--ff-display);text-decoration:none}
.install-brand span{font-size:14px;color:var(--mut)}
.install-actions{display:flex;gap:8px}
.install-actions button,.install-platforms button{min-height:44px;min-width:44px;padding:8px 14px;border:1px solid var(--line);border-radius:4px;background:transparent;color:var(--fg);font:inherit;cursor:var(--cur-hover)}
.install-main{max-width:650px;margin:48px auto;padding:0 24px 32px}
.install-icon{display:block;margin-bottom:20px;border-radius:16px}
.install-main h1{font:700 30px/1.3 var(--ff-display);margin:0 0 12px}
.install-intro{font-size:16px;line-height:1.7;color:var(--mut);margin:0 0 24px;max-width:48ch}
.install-detection{font-size:13px;color:var(--mut);margin:0 0 10px;min-height:20px}
.install-platforms{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.install-platforms button[aria-pressed=true]{color:var(--accent);border-color:var(--accent);background:var(--card)}
.install-instructions{padding:24px 0;border-bottom:1px solid var(--line)}
.install-instructions h2{font:700 22px/1.4 var(--ff-display);margin:0 0 8px}
.install-instructions>p{margin:0 0 12px;color:var(--mut);line-height:1.7}
.install-instructions ol{padding-left:24px;margin:18px 0;line-height:1.8;font-size:16px}
.install-instructions li{padding:4px 0 4px 4px}
.install-instructions .install-note{font-size:13px;margin:0}
.install-trouble{padding:16px 0;border-bottom:1px solid var(--line)}
.install-trouble summary{display:flex;align-items:center;min-height:44px;cursor:var(--cur-hover);color:var(--fg)}
.install-trouble summary::after{content:'+';margin-left:auto;font-size:20px}
.install-trouble[open] summary::after{content:'−'}
.install-trouble p{color:var(--mut);line-height:1.8;margin:4px 0 12px;overflow-wrap:anywhere}
.install-footer{color:var(--mut);font-size:13px;line-height:1.8;margin:24px 0 12px}
.install-return{color:var(--accent);display:inline-flex;align-items:center;min-height:44px;text-underline-offset:4px}
body[data-install-guide] :is(button,a,summary):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media(max-width:700px){.install-header{padding:12px 16px}.install-brand span{display:none}.install-main{margin:28px auto;padding:0 20px 24px}.install-main h1{font-size:26px}.install-platforms button{padding:8px 4px}.install-platforms{gap:6px}}

.install-instructions .install-status{color:var(--fg);margin:12px 0;line-height:1.7}
.install-status[hidden]{display:none}
/* Follow the shared Pen theme; keep the platform instructions and PWA lifecycle. */
.install-header{min-height:72px;padding:12px 24px}
.install-brand{display:flex;align-items:center;gap:12px;font:600 14px/1.4 var(--ff-body);min-width:0}
.install-brand span{font-size:12px}
.install-brand img{display:block;object-fit:contain;flex:none;filter:drop-shadow(0 1px 2px #0009)}
[data-theme=light] .install-brand img{filter:drop-shadow(0 0 1px #111) drop-shadow(0 1px 2px #0009)}
.install-actions{gap:6px;flex:none}
.install-actions button,.install-platforms button{border-radius:6px;font-size:13px;background:var(--card)}
.install-actions button{padding:8px}
.install-main{margin:28px auto;padding-bottom:24px}
.install-icon{width:48px;height:48px;border-radius:12px;margin-bottom:16px}
.install-main h1{font-family:var(--ff-body);font-weight:600;font-size:28px;line-height:1.4}
.install-intro{font-size:14px;margin-bottom:16px}
.install-platforms button[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.install-instructions{padding:20px 0}
.install-instructions h2{font-family:var(--ff-body);font-size:20px;font-weight:600}
.install-instructions>p,.install-instructions ol{font-size:14px}
.install-trouble{padding:10px 0}
.install-trouble summary{gap:12px;font-size:14px}
.install-trouble p{font-size:14px}
@media(max-width:700px){
 .install-header{padding:8px 16px;gap:8px}
 .install-brand{gap:8px;font-size:12px}
 .install-brand img{width:84px;height:32px}
 .install-main{margin:20px auto;padding-inline:16px}
 .install-main h1{font-size:24px}
 .install-platforms button{font-size:12px;padding-inline:2px}
}
@supports(corner-shape:superellipse(2)){
 .install-icon,.install-actions button,.install-platforms button{corner-shape:superellipse(2)}
}