:root{font-family:Segoe UI,Arial,sans-serif;color:#173b2c;background:#f2f3eb}*{box-sizing:border-box}body{margin:0}main{max-width:1260px;margin:auto;padding:24px 28px}header,footer{display:flex;justify-content:space-between;gap:16px;align-items:center}header{margin-bottom:20px}h1{font-size:30px;letter-spacing:-1px;margin:5px 0}.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.5px}.account{text-align:right;display:grid;gap:3px}.account strong{font-size:27px}small,footer{color:#5e7165;font-size:12px}footer{padding:10px 0}:focus-visible{outline:3px solid #c99e32;outline-offset:4px}
@media(max-width:560px){main{padding:16px 12px}h1{font-size:23px}.eyebrow{font-size:8px}.account strong{font-size:21px}footer{align-items:start;flex-direction:column}}
.player-header{gap:16px}
.player-brand{flex:1 1 280px;min-width:0;max-width:280px}
.player-brand h1{margin:0;line-height:1;letter-spacing:normal}
.brand-logo{display:block;width:100%;height:auto}
.player-brand .eyebrow{display:block;margin-top:4px;padding-inline-start:4px;font-size:10px;letter-spacing:1px;line-height:1.4}
.player-header .account{flex:0 1 auto;min-width:0;max-width:48%;overflow-wrap:anywhere}
@media(max-width:560px){
 .player-header{gap:8px;margin-bottom:16px}
 .player-brand{flex-basis:195px;max-width:195px}
 .player-brand .eyebrow{font-size:8px;letter-spacing:.5px}
}

a{color:#185b3e;text-underline-offset:3px}.return-link{display:inline-flex;align-items:center;min-height:44px;font-size:14px;font-weight:600}nav{margin-bottom:14px}.panel{background:#fff;border:1px solid #b8c7bc;border-radius:12px;padding:20px;margin-bottom:18px;min-width:0}h2{font-size:24px;line-height:1.25;margin:0 0 14px}p{font-size:15px;line-height:1.7;margin:0 0 14px}.chapter-label{font-size:11px;font-weight:700;letter-spacing:1.5px;color:#5e7165;margin-bottom:8px}.introduction p:last-child,.creator-note p:last-child{margin-bottom:0}.chapters{display:grid;grid-template-columns:minmax(0,1fr);gap:0}figure{margin:22px 0 0}figure img{display:block;width:100%;height:auto;border:1px solid #d9dfd4;border-radius:7px;background:#f2f3eb}figcaption{font-size:12px;line-height:1.5;color:#5e7165;margin-top:8px}.signature{font-weight:600}.credits{font-size:12px;color:#5e7165}#session-display-note{font-size:12px;color:#5e7165}#session-display-note:empty{display:none}
@media(min-width:800px){.chapters{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.introduction{padding:24px}.introduction h2{font-size:30px}}
@media(max-width:560px){.panel{padding:16px}h2{font-size:22px}}

/* Phase 5C.2B owner review: racetrack introduction and creator-card return. */
.panel.introduction{position:relative;isolation:isolate;overflow:hidden;background:#124c33;color:#f5f1df;border-color:#23644b;padding:24px 20px 30px;box-shadow:0 8px 24px #17362618}
.introduction::after{content:"";position:absolute;z-index:-1;pointer-events:none;inset:auto 0 10px;height:8px;border-top:1px solid #f5edce30;border-bottom:1px dashed #d9b65f70}
.introduction .chapter-label{color:#e6c875}
.introduction h2{font-size:clamp(24px,6.5vw,30px);line-height:1.25;letter-spacing:-.4px;margin-bottom:18px}
.headline-opening,.headline-opening>span,.headline-finish{display:block}
.headline-finish{color:#e6c875}
.introduction>p:last-child{max-width:70ch}
.creator-note .signature{margin-bottom:0}
.return-button{display:flex;justify-content:center;align-items:center;width:100%;min-height:48px;margin:24px 0 4px;padding:12px 20px;border:1px solid #b8c7bc;border-radius:7px;background:#185b3e;color:#fff;font-size:16px;font-weight:700;line-height:1.4;text-align:center;text-decoration:none}
.return-button:focus-visible{outline:3px solid #c99e32;outline-offset:4px}
@media(hover:hover){.return-button:hover{background:#124c33;border-color:#124c33}}
.return-button:active{background:#0e3d29;border-color:#0e3d29}
@media(min-width:800px){.panel.introduction{padding:28px 28px 34px}.introduction h2{font-size:36px}.return-button{width:fit-content;min-width:220px;max-width:100%}}
@media(max-width:350px){.panel.introduction{padding-inline:16px}.introduction h2{font-size:24px}}

/* Phase 5C.2D: coordinated chapter banners; existing card/grid geometry retained. */
.chapters .chapter-banner{width:100%;padding:14px 8px;border-radius:7px;background:#124c33;color:#e6c875;font-size:clamp(16px,4.2vw,22px);line-height:1.3;text-align:center;white-space:nowrap;letter-spacing:-.3px;margin:0 0 18px}
.chapters #chapter-2026{background:#e6c875;color:#124c33}
@media(min-width:800px){.chapters .chapter-banner{text-align:left;font-size:clamp(18px,2.1vw,24px);padding:14px 12px}}