:root{--bg:#f6f2ea;--panel:#fffdf8;--ink:#17211f;--muted:#65716d;--line:#d6ded9;--teal:#146c62;--teal-dark:#0d5049;--aqua:#cfece6;--amber:#f5b84b;--rose:#cf5f5f;--blue:#5277a8;--radius:8px}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;letter-spacing:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;letter-spacing:0}button{cursor:pointer}img{display:block;max-width:100%}.shell{display:grid;grid-template-columns:250px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:24px;padding:22px 18px;border-right:1px solid var(--line);background:#eef5f1}.brand{display:flex;align-items:center;gap:12px}.brand-logo{width:44px;height:44px;flex:0 0 auto;border-radius:var(--radius)}.brand-name{font-size:18px;line-height:1.05}.muted{color:var(--muted)}.nav{display:grid;gap:8px}.nav a,.nav button{display:flex;align-items:center;gap:10px;min-height:42px;padding:0 10px;border:1px solid transparent;border-radius:var(--radius);background:transparent;color:var(--ink);text-align:left}.nav a:hover,.nav button:hover{border-color:rgba(20,108,98,.2);background:white}.sidebar-card{padding-top:18px;border-top:1px solid var(--line)}.main{min-width:0;padding:24px}.actions,.reader-controls,.reader-toolbar,.section-heading,.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px}.topbar{margin-bottom:20px}.eyebrow{margin:0;color:var(--teal);font-size:12px;font-weight:850;text-transform:uppercase}h1,h2,h3,p{letter-spacing:0}h1{font-size:34px;line-height:1.05}h1,h2{margin:4px 0 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11px}.textarea{min-height:130px;padding:11px;line-height:1.5;resize:vertical}.field{display:grid;gap:6px;color:var(--muted);font-size:12px;font-weight:850;text-transform:uppercase}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}.book-card{display:grid;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:white}.book-cover{position:relative;aspect-ratio:3/4;background:#dfe9e4}.book-cover img{width:100%;height:100%;object-fit:cover}.price{position:absolute;right:8px;bottom:8px;display:inline-flex;align-items:center;min-height:28px;padding:0 9px;border-radius:999px;background:white;color:var(--teal);font-size:12px;font-weight:900}.book-body{display:grid;gap:9px;padding:12px}.book-body h3{margin:0;font-size:17px;line-height:1.2}.book-meta{gap:7px;margin:0;color:var(--muted);font-size:13px}.book-meta,.tag-row{display:flex;flex-wrap:wrap}.tag-row{gap:6px}.tag{display:inline-flex;align-items:center;min-height:24px;padding:0 8px;border-radius:999px;background:#eef5f1;color:var(--teal);font-size:12px;font-weight:800}.split{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:18px;align-items:start}.detail-cover{overflow:hidden;border-radius:var(--radius);border:1px solid var(--line);background:white}.detail-cover img{width:100%;max-height:520px;object-fit:cover}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.full-span{grid-column:1/-1}.stack{display:grid;gap:14px}.row-card{display:grid;grid-template-columns:72px minmax(0,1fr) auto;align-items:center;gap:12px;padding:10px;border:1px solid var(--line);border-radius:var(--radius);background:white}.row-card img{width:72px;height:96px;object-fit:cover;border-radius:6px}.request-card{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:var(--radius);background:white}.request-card 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68px)}.chat-panel,.toc{padding:18px;border-right:1px solid var(--line);background:#eef5f1}.chat-panel{border-right:0;border-left:1px solid var(--line)}.reader-content{max-width:840px;width:100%;margin:0 auto;padding:54px 46px 90px}.reader-mode-toggle{display:flex;gap:6px}.reader-content h1{font-size:38px}.reader-content h1,.reader-text{font-family:Georgia,Times New Roman,serif}.reader-text{font-size:var(--reader-size,20px);line-height:1.75;white-space:pre-wrap}.pdf-reader-content{max-width:none;padding:18px}.pdf-frame{display:block;width:100%;height:calc(100vh - 104px);min-height:620px;border:1px solid var(--line);border-radius:var(--radius);background:white}.chat-log{display:grid;gap:10px;max-height:48vh;overflow:auto}.chat-message{padding:10px;border-radius:var(--radius);background:white;font-size:14px;line-height:1.5}.chat-message.user{background:var(--aqua)}@media (max-width:1100px){.reader-layout,.shell,.split{grid-template-columns:1fr}.sidebar{position:static;height:auto}.nav{grid-template-columns:repeat(4,1fr)}.search-panel{grid-template-columns:1fr 1fr}.toc{display:none}}@media (max-width:620px){.main{padding:16px}.actions,.cover-editor,.form-grid,.request-actions,.request-card,.row-card,.search-panel,.topbar{grid-template-columns:1fr;display:grid;align-items:stretch}h1{font-size:29px}.reader-content{padding:28px 20px 60px}.pdf-reader-content{padding:12px}.pdf-frame{height:72vh;min-height:520px}}