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var(--color-border-hard);box-shadow:var(--shadow-inset)}.stp-chapbox-l.is-flat .stp-seg{width:100%;margin-left:0}.stp-chap{position:relative;overflow:hidden;display:flex;align-items:center;gap:9px;width:100%;min-height:34px;padding:0 10px;text-align:left;background:transparent;border:0;border-bottom:2px solid var(--color-border-soft);border-left:3px solid 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button+button{border-left:2px solid var(--color-border-hard)}.stp-xsec-tabs button.is-on{background:var(--color-brand-primary);color:var(--color-text-on-brand)}.stp-xsec-y{margin-left:auto;font-size:11px;font-weight:800;color:var(--color-text-disabled)}.stp-xsec-y b{color:var(--color-brand-primary);font-weight:900}.stp-xsec-y i{margin-left:2px;font-style:normal}.stp-xsec-fold svg{transition:transform .16s ease}.stp-xsec.is-collapsed .stp-xsec-fold svg{transform:rotate(180deg)}.stp-xsec.is-collapsed .stp-xsec-body{display:none}.stp-xsec-body{flex:none;aspect-ratio:1;display:grid;place-items:center;padding:10px;background:var(--color-bg-primary)}.stp-xsec.is-sm .stp-xsec-body{aspect-ratio:auto;height:150px}.stp-xsec-grid{display:grid;gap:1px}.stp-xsec-grid>i{display:block;background:transparent;box-shadow:inset 0 0 0 1px var(--color-border-soft)}.stp-xsec-grid>i.is-done{background:var(--color-bg-deep);box-shadow:none}.stp-xsec-grid>i.is-now{background:var(--color-brand-primary);box-shadow:none}.stp-copy-chapter{display:block;margin-bottom:6px;color:var(--color-brand-primary);font-style:normal;font-size:11px;font-weight:900;letter-spacing:.1em}.stp-fail{padding:40px 0;font-size:14px;font-weight:800;color:var(--color-text-muted)}.stp-fail a{margin-left:10px;color:var(--color-brand-primary)}.stp-foot{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:22px;padding:18px 0;border-top:2px solid var(--color-border-hard)}.stp-foot>span{color:var(--color-text-disabled);font-size:13px;font-weight:700}.stp-foot-btn{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;color:var(--color-text-on-brand);background:var(--color-brand-primary);border:2px solid var(--color-border-hard);box-shadow:var(--shadow-hard-sm);font-size:13.5px;font-weight:900}@media (max-width:767px){.bdi-page .stp-rail{display:none}.stp-flag{margin-left:0}.stp-foot{padding:18px 14px}}