.pv4s{--good:#1a7a4a;--good-soft:#e9f3ec;--bad:#b3392f;--bad-soft:#f8ece9;--warn:#a8730a;padding-bottom:40px}.pv4s-measure{width:min(100%,44rem);margin-inline:auto}.pv4s-wide{width:min(100%,62rem);margin-inline:auto}.pv4s-sec{padding-block:64px}.pv4s-sec+.pv4s-sec{border-top:1px solid var(--rule)}.pv4s-head{padding:72px 0 56px}.pv4s-head h1{letter-spacing:-.05em;text-wrap:balance;color:var(--ink);margin:16px 0 14px;font-size:clamp(2rem,3.4vw,2.9rem);font-weight:750;line-height:1.02}.pv4s-subtitle{max-width:40rem;color:var(--muted);margin:0;font-size:1rem;line-height:1.65}.pv4s-byline{align-items:center;gap:12px;margin-top:28px;display:flex}.pv4s-byline img{object-fit:cover;border:1px solid var(--ink);width:38px;height:38px}.pv4s-byline .name{color:var(--ink);font-size:.84rem;font-weight:700;line-height:1.2}.pv4s-byline .meta{color:var(--muted);font:500 .6rem/1.5 var(--font-mono), ui-monospace, monospace;letter-spacing:.1em;text-transform:uppercase}.pv4s-num{color:var(--blue);font:650 .64rem/1.45 var(--font-mono), ui-monospace, monospace;letter-spacing:.16em;text-transform:uppercase;margin-bottom:12px}.pv4s-sec h2{letter-spacing:-.04em;text-wrap:balance;color:var(--ink);margin:0 0 18px;font-size:clamp(1.35rem,2.4vw,1.75rem);font-weight:750;line-height:1.12}.pv4s-prose p{color:var(--muted);margin:0 0 17px;font-size:.96rem;line-height:1.7}.pv4s-prose p:last-child{margin-bottom:0}.pv4s-prose code{border:1px solid var(--rule);background:var(--paper);color:var(--ink);font-family:var(--font-mono), ui-monospace, monospace;padding:.1em .35em;font-size:.84em}.pv4s-demo{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);margin-top:42px}.pv4s-demo-top{border-bottom:1px solid var(--ink);color:var(--muted);font:650 .58rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.16em;text-transform:uppercase;justify-content:space-between;gap:16px;padding:12px 20px;display:flex}.pv4s-demo-body{display:grid}@media (min-width:820px){.pv4s-demo-body{grid-template-columns:1fr 1fr}}.pv4s-panel{padding:24px 22px 26px}@media (min-width:820px){.pv4s-panel{border-right:1px solid var(--rule)}.pv4s-panel:last-child{border-right:none}}@media (max-width:819px){.pv4s-panel{border-bottom:1px solid var(--rule)}.pv4s-panel:last-child{border-bottom:none}}.pv4s-panel-label{font:650 .58rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px}.pv4s-panel.bad .pv4s-panel-label{color:var(--bad)}.pv4s-panel.good .pv4s-panel-label{color:var(--good)}.pv4s-chip-note{color:var(--muted);margin-top:14px;font-size:.8rem;line-height:1.6}.pv4s-prompt{border:1px dashed var(--bad);background:var(--bad-soft);color:var(--ink);font-family:var(--font-mono), ui-monospace, monospace;white-space:pre-wrap;padding:14px 15px;font-size:.74rem;line-height:1.8}.pv4s-perm{border:1px solid var(--good);background:var(--good-soft)}.pv4s-perm-row{border-bottom:1px solid #1a7a4a4d;grid-template-columns:1fr auto;align-items:center;gap:14px;padding:11px 14px;display:grid}.pv4s-perm-row:last-child{border-bottom:none}.pv4s-perm-row .k{color:var(--ink);font-size:.8rem;font-weight:600}.pv4s-perm-row .v{background:var(--paper);font:650 .56rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.12em;text-transform:uppercase;border:1px solid;padding:3px 8px}.pv4s-perm-row .v.on{color:var(--good)}.pv4s-perm-row .v.off{color:var(--bad)}.pv4s-compare{gap:18px;margin-top:40px;display:grid}@media (min-width:820px){.pv4s-compare{grid-template-columns:1fr 1fr}}.pv4s-card{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);padding:24px 22px}.pv4s-card .tag{font:650 .56rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.18em;text-transform:uppercase;margin-bottom:11px}.pv4s-card.bad .tag{color:var(--bad)}.pv4s-card.good .tag{color:var(--good)}.pv4s-card.plain .tag{color:var(--blue)}.pv4s-card h4{color:var(--ink);letter-spacing:-.03em;margin:0 0 9px;font-size:1.02rem;font-weight:750;line-height:1.25}.pv4s-card>p{color:var(--muted);margin:0;font-size:.84rem;line-height:1.6}.pv4s-card>p+p{margin-top:12px}.pv4s-mono-box{border:1px solid var(--rule);background:var(--canvas);color:var(--muted);font-family:var(--font-mono), ui-monospace, monospace;white-space:pre-wrap;margin-top:15px;padding:14px 15px;font-size:.72rem;line-height:1.8;overflow-x:auto}.pv4s-code{margin-top:40px}.pv4s-code pre{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);color:var(--ink);font-family:var(--font-mono), ui-monospace, monospace;margin:0;padding:22px;font-size:.74rem;line-height:1.75;overflow-x:auto}.pv4s-quote{text-align:center;width:min(100%,48rem);margin-inline:auto}.pv4s-quote blockquote{color:var(--ink);letter-spacing:-.04em;text-wrap:balance;margin:0;font-size:clamp(1.45rem,2.8vw,2.1rem);font-weight:750;line-height:1.15}.pv4s-quote .byline{color:var(--muted);font:650 .58rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.18em;text-transform:uppercase;margin-top:16px}.pv4s-principles{gap:18px;margin-top:40px;display:grid}@media (min-width:820px){.pv4s-principles{grid-template-columns:repeat(4,1fr)}}.pv4s-principles.three{grid-template-columns:1fr}@media (min-width:820px){.pv4s-principles.three{grid-template-columns:repeat(3,1fr)}}.pv4s-principle{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);padding:22px 20px}.pv4s-principle .idx{color:var(--blue);font:650 .6rem/1 var(--font-mono), ui-monospace, monospace;letter-spacing:.12em;margin-bottom:12px}.pv4s-principle h4{color:var(--ink);letter-spacing:-.03em;margin:0 0 7px;font-size:.95rem;font-weight:750;line-height:1.25}.pv4s-principle p{color:var(--muted);margin:0;font-size:.8rem;line-height:1.55}.pv4s-table{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);margin-top:40px;overflow-x:auto}.pv4s-table table{border-collapse:collapse;width:100%}.pv4s-table th,.pv4s-table td{border-bottom:1px solid var(--rule);text-align:left;vertical-align:top;padding:13px 18px}.pv4s-table th{border-bottom:1px solid var(--ink);background:var(--canvas);color:var(--muted);font:650 .56rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.16em;text-transform:uppercase;white-space:nowrap}.pv4s-table td{color:var(--muted);font-size:.86rem;line-height:1.55}.pv4s-table td:first-child{color:var(--ink);font-weight:700}.pv4s-table tr:last-child td{border-bottom:none}.pv4s-table .rung{font-family:var(--font-mono), ui-monospace, monospace;letter-spacing:-.01em;font-size:.74rem;font-weight:500}.pv4s-good{color:var(--good);font-weight:700}.pv4s-bad{color:var(--bad);font-weight:700}.pv4s-warn{color:var(--warn);font-weight:700}.pv4s-table .note{color:var(--muted);margin-top:3px;font-size:.76rem;font-weight:400;display:block}.pv4s-stack{gap:10px;margin-top:40px;display:grid}.pv4s-layer{border:1px solid var(--ink);background:var(--paper);grid-template-columns:11rem 1fr;align-items:start;gap:20px;padding:20px 22px;display:grid}.pv4s-layer.ours{box-shadow:10px 10px 0 var(--soft);border-width:2px}.pv4s-layer.theirs{background:var(--canvas);border-style:dashed}.pv4s-layer .who{color:var(--blue);font:650 .58rem/1.5 var(--font-mono), ui-monospace, monospace;letter-spacing:.14em;text-transform:uppercase}.pv4s-layer.theirs .who{color:var(--muted)}.pv4s-layer h4{color:var(--ink);letter-spacing:-.03em;margin:0 0 7px;font-size:1rem;font-weight:750;line-height:1.25}.pv4s-layer p{color:var(--muted);margin:0;font-size:.84rem;line-height:1.6}@media (max-width:700px){.pv4s-layer{grid-template-columns:1fr;gap:10px}}.pv4s-bolts{gap:18px;margin-top:40px;display:grid}@media (min-width:700px){.pv4s-bolts{grid-template-columns:1fr 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.t{color:var(--ink);margin-bottom:4px;font-size:.84rem;font-weight:700}.pv4s-step .n{color:var(--muted);font-size:.8rem;line-height:1.55}.pv4s-step.is-bad{border-color:var(--bad);background:var(--bad-soft)}.pv4s-step.is-good{border-color:var(--good);background:var(--good-soft)}.pv4s-phones{border:1px solid var(--ink);background:var(--paper);box-shadow:10px 10px 0 var(--soft);gap:26px;margin-top:40px;padding:32px 22px;display:grid}@media (min-width:760px){.pv4s-phones{grid-template-columns:1fr 1fr;gap:34px}}.pv4s-phone-slot{justify-items:center;gap:14px;display:grid}.pv4s-phone-cap{width:100%;max-width:21rem}.pv4s-phone-cap .k{color:var(--blue);font:650 .56rem/1.4 var(--font-mono), ui-monospace, monospace;letter-spacing:.16em;text-transform:uppercase;margin-bottom:6px;display:block}.pv4s-phone-cap h4{color:var(--ink);letter-spacing:-.03em;margin:0 0 6px;font-size:.95rem;font-weight:750}.pv4s-phone-cap p{color:var(--muted);margin:0;font-size:.8rem;line-height:1.55}.pv4s-phone{border:2px 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#0000001f;padding:9px 0}.pv4s-notif .acts button:last-child{color:var(--muted);border-right:0}.pv4s-homebar{background:#ffffff8c;border-radius:2px;width:92px;height:3px;margin:6px auto 7px}.pv4s-homebar.on-light{background:#0000004d}.pv4s-appview{background:var(--canvas);color:var(--ink);flex-direction:column;flex:1;display:flex}.pv4s-appbar{border-bottom:1px solid var(--rule);background:var(--paper);align-items:center;gap:8px;padding:8px 13px 10px;display:flex}.pv4s-appbar .avatar{background:var(--ink);color:#fff;width:24px;height:24px;font:700 .58rem/1 var(--font-sans), system-ui, sans-serif;border-radius:50%;place-items:center;display:grid}.pv4s-appbar .nm{letter-spacing:-.02em;font-size:.7rem;font-weight:700;display:block}.pv4s-appbar .rl{font:500 .5rem/1.3 var(--font-mono), ui-monospace, monospace;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;display:block}.pv4s-appbar .ttl{font:650 .52rem/1 var(--font-mono), ui-monospace, 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