:root{--bg:#f5f6f8;--surface:#fff;--surface2:#fbfbfc;--text:#17171c;--muted:#7d7f89;--border:#e5e5ea;--purple:#7254cb;--purple2:#2c243d;--dark:#17131f;--green:#388556;--red:#c94d5f;--orange:#c48232}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}.app-shell{display:grid;grid-template-columns:230px minmax(0,1fr);min-height:100vh}.sidebar{background:var(--dark);color:#fff;padding:24px 15px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;z-index:50}.brand{display:flex;align-items:center;gap:11px;padding:0 8px 23px}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(145deg,#956ff1,#4e2ca8);display:grid;place-items:center;font-size:20px;font-weight:900}.brand strong{font-size:15px}.brand small{display:block;color:#aba5b7;font-size:10px;margin-top:2px}.nav-group{padding:15px 10px 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14px;border-radius:10px;font-size:12px}.flash.success{background:#eaf7ef;color:#31754a}.flash.error{background:#fff0f2;color:#b24254}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.stat-card,.panel{background:var(--surface);border:1px solid var(--border);border-radius:16px}.stat-card{padding:17px}.stat-label{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.stat-card strong{display:block;font-size:28px;margin:8px 0 2px}.stat-card small{color:var(--muted)}.grid-2{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(260px,.8fr);gap:16px;margin-top:16px}.panel{padding:18px}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:13px}.panel h2,.panel h3{font-size:14px;margin:0}.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:13px}.data-table{width:100%;border-collapse:collapse;background:#fff;min-width:760px}.data-table 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h2{font-size:17px}.panel{padding:14px}.ebook-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ebook-cover{height:145px}.searchbar{flex-direction:column}.searchbar select{width:100%}}