.chapter-active #main,.chapter-active #stageNav,.chapter-active .bottom,.chapter-active .privacy-controls,.chapter-active .tb-bridge,.chapter-active .ch-summary{display:none!important}
#chapterRoot[hidden]{display:none!important}
#chapterRoot{background:#f6f1e8;color:#302820;min-height:calc(100vh - 64px);padding:26px 18px 60px}
.ch-shell{max-width:1200px;margin:auto;background:#fffdf8;border:1px solid #dfd3be;border-radius:22px;overflow:hidden;box-shadow:0 16px 42px #46342213}
.ch-top{display:flex;justify-content:space-between;padding:16px 30px;font-size:12px;font-weight:700;letter-spacing:.13em;color:#775d35}
.ch-progress{height:5px;background:#e9dfcf}.ch-progress span{display:block;height:100%;background:#b79151;transition:width .25s}
.ch-layout{display:grid;grid-template-columns:minmax(220px,30%) 1fr}
.ch-layout aside{background:linear-gradient(150deg,#443026,#765438);color:#fff7e7;padding:44px 32px;min-height:540px}
.ch-layout aside h1{font-size:clamp(28px,3vw,44px);line-height:1.13;color:#fffaf1;margin:18px 0 25px}
.ch-layout aside p{color:#eadccb;line-height:1.65}.ch-eyebrow,.ch-small{letter-spacing:.16em;font-size:11px;font-weight:800;color:#e4c085}.ch-jp{font-size:13px}
.ch-pill{border:1px solid #bda582;border-radius:30px;padding:9px 13px;margin-top:28px;font-size:12px;display:inline-block}.ch-skip{margin-top:35px;display:block;border:1px solid #e4cba3;background:transparent;color:white;padding:9px;border-radius:9px}
.ch-content{padding:40px clamp(22px,4vw,60px);font-size:16px;line-height:1.73}
.ch-content p{margin:12px 0 20px}.ch-content blockquote{font-family:Georgia,serif;font-size:clamp(22px,2.8vw,33px);line-height:1.38;padding:20px 28px;border-left:4px solid #b58c4b;margin:24px 0;background:#f9f3e8;color:#4b3423}
.ch-lead{font-size:19px}.ch-insight{background:#f4eee2;padding:20px 25px;border-radius:13px;margin:24px 0}.ch-insight strong{color:#76532b}.ch-insight p{margin-bottom:0}
.ch-illustration{margin:25px auto;max-width:640px;text-align:center}.ch-illustration img,.ch-unit2{width:100%;height:auto;border:1px solid #ddd3c4;border-radius:12px}.ch-illustration span,.ch-caption{font-size:12px;color:#7c7268}
.ch-question{border:1px solid #e4d9c9;border-radius:14px;padding:18px 20px;margin:0 0 20px}.ch-question legend{font-weight:750;padding:0 8px}.ch-option{display:flex;gap:10px;align-items:flex-start;line-height:1.45;padding:12px;border-radius:9px;margin:7px 0;border:1px solid #e9e3d7;cursor:pointer}.ch-option.is-chosen{background:#f8f0dd;border-color:#bfa06b}.ch-feedback{font-size:14px;color:#5c5738;background:#f5f5e9;padding:9px 12px;border-radius:8px}
.ch-vocab{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.ch-vocab>div{border:1px solid #ddd4c7;border-radius:12px;padding:17px;display:flex;flex-direction:column;gap:8px}.ch-vocab strong{font-size:20px;color:#78542b}.ch-vocab span{font-size:14px}.ch-vocab em{font-size:14px;color:#685b4d}
.ch-pair{display:grid;grid-template-columns:1fr 1fr;gap:15px}.ch-pair>div{padding:20px;border-radius:12px;background:#f5eee5}.ch-pair>div+div{background:#eaf0e7}.ch-pair strong{display:block;margin:12px 0}.ch-pair p{font-size:14px}
.ch-record label{display:block;font-weight:700;margin:18px 0}.ch-record textarea{width:100%;display:block;box-sizing:border-box;padding:13px;border:1px solid #cdbfa9;border-radius:10px;margin:7px 0;font:inherit;font-weight:400;background:#fff}
.ch-actions{display:flex;justify-content:space-between;gap:12px;margin-top:30px}.ch-actions button{border-radius:9px;padding:13px 22px;cursor:pointer}.ch-next{background:#503526;color:white;border:0}.ch-warning{color:#ad442d;min-height:25px;font-size:14px}.ch-summary{max-width:1150px;margin:12px auto;border:1px solid #d8c4a7;border-radius:12px;padding:12px 18px;background:#fff7e9}.ch-summary summary{cursor:pointer;font-weight:700}.ch-summary p{margin:10px 0}
@media(max-width:760px){.ch-layout{grid-template-columns:1fr}.ch-layout aside{min-height:auto;padding:24px}.ch-content{padding:22px}.ch-pair,.ch-vocab{grid-template-columns:1fr}.ch-top{padding:13px 18px}}