/* Four individual historical compositions, with opaque reading surfaces. */
body{isolation:isolate;--ambient-light-desktop:url("art/v8/background-light-desktop.webp");--ambient-light-mobile:url("art/v8/background-light-mobile.webp");--ambient-dark-desktop:url("art/v8/background-dark-desktop.webp");--ambient-dark-mobile:url("art/v8/background-dark-mobile.webp")}
/* One fixed composited surface. Its large viewport height remains stable while
   mobile browser chrome retracts; inset:0 / dvh would resize the cover image.
   The image and tint share the same layer, so neither drifts relative to it. */
body{--ambient-image:var(--ambient-light-desktop);--ambient-tint:linear-gradient(90deg,#f7f4ed66,#f7f4ed9e 35%,#f7f4ed85 65%,#f7f4ed55)}
body:before{content:"";position:fixed;top:0;left:0;right:0;bottom:auto;height:100vh;height:100lvh;z-index:-1;pointer-events:none;background-image:var(--ambient-tint),var(--ambient-image);background-size:cover;background-position:center;background-repeat:no-repeat;transform:translate3d(0,0,0);backface-visibility:hidden;contain:paint;transition:none;animation:none}
body:after{content:none}
body.dark{--ambient-image:var(--ambient-dark-desktop);--ambient-tint:linear-gradient(90deg,#0b101840,#10131a80 40%,#10131a75 65%,#0b101835)}
body.high-contrast:before{display:none}
.landing{padding-top:20px}.landing .issue-line{background:var(--white);padding:15px 20px;border:1px solid var(--line);border-radius:8px}
.cover-copy{background:var(--white);padding:clamp(24px,3vw,44px);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
.cover-grid{gap:36px;padding-block:38px}.cover-image figcaption{padding:12px;background:var(--white);border-radius:0 0 8px 8px}
.cover-scope{background:var(--white);padding:28px;border:1px solid var(--line);border-radius:12px;margin-bottom:14px}
.scope-method{display:table;background:var(--white);padding:10px 14px;border:1px solid var(--line);border-radius:8px;line-height:1.7}
.strategy-feature>div{background:var(--white);padding:28px;border:1px solid var(--line);border-radius:12px;min-width:0}
.cover-bottom{background:var(--white);padding:28px;border:1px solid var(--line);border-radius:12px}
.landing-footer{background:var(--white);padding:22px;margin:24px 0;border:1px solid var(--line);border-radius:10px;flex-wrap:wrap}
.main-nav,.rail-note,.quote-card,.briefing,.flow-steps{background:var(--white);border:1px solid var(--line);border-radius:10px}
.main-nav{padding:8px}.rail-note{padding:20px}.flow-steps{padding:12px 10px;gap:8px}.rail-credits{background:var(--white)}
.info-page>.site-info{background:var(--white);margin-top:24px;margin-bottom:24px;border:1px solid var(--line);border-radius:14px;padding:clamp(20px,4vw,48px)}
.info-footer{background:var(--white)}
.cover-music{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:22px 0 18px}
.cover-music>span{color:var(--muted);font-size:11px}
.music-toggle{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);padding:10px 14px;min-height:44px;font:600 12px/1.5 var(--sans)}
.music-toggle[aria-pressed=true]{border-color:var(--accent);color:var(--accent)}
.music-toggle svg,.music-heading svg{display:block;width:22px;height:22px;flex:none}
.music-toggle:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.music-controls{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px;margin:24px 0}
.music-heading{display:flex;align-items:center;gap:14px}.music-heading>span{color:var(--accent);flex:none}
#modal .music-heading h2{font:750 18px/1.4 var(--sans);margin:0}.music-heading p{font-size:12px;color:var(--muted);margin:5px 0 0}
.music-controls .setting-row{padding:18px 0;margin-top:4px}.music-volume{display:flex;justify-content:space-between;gap:15px;font-size:13px;margin:20px 0 8px}
#music-volume{width:100%;min-height:44px;accent-color:var(--accent);padding:0;cursor:pointer}
.music-track-label{display:block;font-size:13px;margin:14px 0 9px}
#music-track{width:100%;min-height:48px;border:1px solid var(--line);border-radius:8px;background:var(--white);color:var(--ink);padding:10px;font:400 13px/1.5 var(--sans)}
.music-status{font-size:12px;line-height:1.7;min-height:2em;margin:14px 0;color:var(--ink)}
.music-note{font-size:11px;color:var(--muted);line-height:1.8;margin:12px 0}.music-controls .info-link{font-size:11px}
.music-credits{display:grid;gap:16px}.music-credit{border:1px solid var(--line);padding:22px;border-radius:10px}.music-credit h3{font-size:20px;margin:0 0 12px}.music-credit p{font-size:13px;line-height:1.8}.music-credit .info-actions{margin-bottom:0}
@media(max-width:700px){body{--ambient-image:var(--ambient-light-mobile)}body:before{background-position:center top}body.dark{--ambient-image:var(--ambient-dark-mobile)}.landing{padding-top:14px}.cover-copy{padding:24px 20px}.cover-grid{gap:28px;padding-block:24px}.cover-copy h1{font-size:clamp(34px,8vw,48px);letter-spacing:-1.5px}.cover-scope{padding:20px 16px}.strategy-feature>div{padding:24px 20px}.cover-bottom{padding:24px 18px}.landing-footer{padding:18px}.flow-steps{padding:10px 7px;font-size:10px;gap:5px}.music-controls{padding:18px}.info-page>.site-info{border-radius:0;margin-block:14px;border-inline:0}.music-credit{padding:18px}}

/* Both music states occupy exactly the same area. */
.cover-music{display:grid;grid-template-columns:minmax(0,1fr);align-items:start;gap:10px}
.cover-music .music-toggle{width:232px;max-width:100%;min-height:48px;justify-content:flex-start;white-space:nowrap}
.cover-music [data-music-label]{white-space:nowrap;font-size:12px}
.cover-music>span{display:block;line-height:1.6;margin:0}