.tb-hero,.tb-bookhero{padding:56px 0 50px;background:linear-gradient(125deg,var(--bg-soft),var(--panel));border-bottom:1px solid var(--line)}.tb-hero h1,.tb-bookhero h1{font-size:clamp(32px,4.4vw,52px);max-width:900px;letter-spacing:-.035em;margin:13px 0}.tb-hero p,.tb-bookhero p{max-width:850px;color:var(--text);font-size:17px;line-height:1.7}.tb-stats{display:flex;gap:32px;flex-wrap:wrap}.tb-stats span{display:flex;align-items:center;gap:7px;color:var(--muted)}.tb-stats b{font-size:24px;color:var(--ink)}.tb-library,.tb-detail{padding-top:34px;padding-bottom:84px}.tb-filter{margin-bottom:22px}.tb-filter label{display:block;font-size:14px;margin-bottom:8px;font-weight:600}.tb-filter input{max-width:650px;width:100%;background:var(--panel);color:var(--ink);border:1px solid var(--line-strong);padding:13px 17px;border-radius:10px;font:inherit}.tb-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.tb-book{--tb-hue:#2563eb;display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px;min-height:217px;box-shadow:var(--shadow)}.tb-book:hover{border-color:var(--tb-hue);transform:translateY(-2px)}.tb-category,.tb-smallcategory{color:var(--tb-hue,#2873c7);font-size:12px;letter-spacing:.08em;font-weight:700;text-transform:uppercase}.tb-book h3{margin:12px 0 6px;font-size:18px}.tb-book p{font-size:13px;color:var(--muted);margin:0 0 12px}.tb-book small{margin-top:auto;color:var(--muted)}.tb-action{font-size:13px;margin-top:13px;font-weight:700;color:var(--tb-hue)}.tb-disclosure{color:var(--muted);font-size:13px;margin-top:27px}.tb-links{display:flex;gap:9px;flex-wrap:wrap}.tb-detail{display:grid;grid-template-columns:minmax(0,1fr) 330px;align-items:start;gap:28px}.tb-focus,.tb-chapters,.tb-todo{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}.tb-focus{grid-column:1}.tb-chapters{grid-column:2;grid-row:1 / span 2;position:sticky;top:85px;max-height:80vh;overflow:auto}.tb-todo{grid-column:1}.tb-focus h2{font-size:27px;margin:6px 0 8px}.tb-focus h3{margin:24px 0 10px}.tb-focus ul{padding-left:20px;line-height:1.8}.tb-focus li{padding-bottom:8px}.tb-source{font-size:13px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:14px}.tb-focus p{line-height:1.85}.tb-figure{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;margin:23px 0;color:#16233b}.tb-fig-header{display:flex;gap:12px;justify-content:space-between;align-items:center;flex-wrap:wrap;padding:15px;background:#f2f5fa;border-bottom:1px solid #d8dfeb;font-size:14px}.tb-fig-header span{font-size:11px;color:#66748c}.tb-slider{display:flex;gap:16px;align-items:center;flex-wrap:wrap;padding:12px 18px;font-size:13px;background:#fcfdff}.tb-slider input{flex:1;max-width:420px;accent-color:#336be4}.tb-slider output{min-width:35px;font-weight:700}.tb-svg{width:100%;overflow:auto;padding:12px}.tb-svg svg{display:block;width:100%;min-width:400px;height:auto}.tb-caution,.tb-reflect{padding:14px 17px;border-left:3px solid #d69031;background:var(--bg-soft);border-radius:6px;margin-top:15px;font-size:14px;line-height:1.7}.tb-reflect{border-color:#32836e}.tb-chapters h2{font-size:19px;margin:0 0 10px}.tb-chapters h2 small{font-size:12px;color:var(--muted)}.tb-chapters p{color:var(--muted);font-size:13px;line-height:1.7}.tb-ch-row{padding:11px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:23px 1fr;gap:0 8px;font-size:13px}.tb-ch-row>span{color:var(--muted)}.tb-ch-row b{font-weight:600;line-height:1.4}.tb-ch-row small{grid-column:2;color:var(--muted);margin-top:5px}.tb-todo h2{font-size:20px;margin-top:0}.tb-todo p{font-size:14px;line-height:1.8;color:var(--muted)}@media(max-width:1020px){.tb-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tb-detail{grid-template-columns:1fr}.tb-focus,.tb-todo,.tb-chapters{grid-column:1;grid-row:auto}.tb-chapters{position:static;max-height:none}}@media(max-width:600px){.tb-grid{grid-template-columns:1fr}.tb-hero,.tb-bookhero{padding:36px 0}.tb-focus,.tb-chapters,.tb-todo{padding:18px}.tb-hero p{font-size:15px}.tb-stats{gap:12px}.tb-stats span{font-size:12px}.tb-book{min-height:180px}}

.tb-lesson-ref{font-size:13px;border:1px solid var(--line);padding:10px 12px;border-radius:10px;background:var(--bg-soft);margin:16px 0;color:var(--muted)}.tb-lesson-ref a{color:var(--link);font-weight:700;text-decoration:underline}

.tb-extra{grid-column:1;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}.tb-extra h2{font-size:25px;margin:6px 0 10px}.tb-extra h3{margin-top:24px}.tb-extra ul{padding-left:20px;line-height:1.8}.tb-extra li{margin-bottom:9px}.tb-extra p{line-height:1.8}@media(max-width:600px){.tb-extra{padding:18px}}