:root{--bg:#f5f7fb;--card:#fff;--text:#172033;--muted:#6b7280;--primary:#2563eb;--border:#e5e7eb;--sidebar:#0f172a}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}.sidebar{position:fixed;inset:0 auto 0 0;width:250px;background:var(--sidebar);padding:24px 18px;color:#cbd5e1;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:12px;color:#fff;font-size:20px;margin-bottom:35px}.brand span,.login-logo{display:grid;place-items:center;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;border-radius:14px;font-weight:800}.brand span{width:42px;height:42px}.sidebar nav{display:grid;gap:7px}.sidebar nav a,.nav-button{padding:12px 14px;border-radius:10px;border:0;background:transparent;color:inherit;text-align:left;font:inherit;cursor:pointer}.sidebar nav a:hover,.nav-button:hover{background:#1e293b;color:#fff}.sidebar form{margin-top:auto}.app{margin-left:250px;min-height:100vh}.topbar{height:76px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 30px;gap:14px}.topbar small{display:block;color:var(--muted);margin-top:3px}.menu-button{display:none;border:0;background:transparent;font-size:24px}.page{padding:30px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:24px}.stats article,.panel{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:0 8px 28px rgba(15,23,42,.04)}.stats article{padding:22px}.stats span{color:var(--muted);font-size:14px}.stats strong{display:block;font-size:30px;margin-top:9px}.panel{padding:22px;margin-bottom:24px}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.panel h2,.panel h3{margin:0}.panel p{color:var(--muted);margin:5px 0}.btn{display:inline-flex;justify-content:center;align-items:center;padding:10px 15px;border:1px solid var(--border);border-radius:10px;background:#fff;cursor:pointer;font:inherit}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.small{padding:7px 10px;font-size:13px}.full{width:100%}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse}th,td{padding:13px 12px;border-bottom:1px solid var(--border);text-align:left;white-space:nowrap}th{font-size:12px;color:var(--muted);text-transform:uppercase}.badge{padding:5px 9px;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-size:12px}.search{display:flex;gap:8px;flex:1;max-width:560px}input,select{width:100%;padding:11px 12px;border:1px solid #d6dbe5;border-radius:10px;background:#fff;font:inherit;outline:none}input:focus,select:focus{border-color:#60a5fa;box-shadow:0 0 0 3px #dbeafe}.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.book-card{border:1px solid var(--border);border-radius:14px;padding:16px;display:flex;gap:15px}.book-cover{width:64px;height:88px;flex:none;border-radius:9px;background:#e0e7ff;color:#4338ca;display:grid;place-items:center;font-weight:800}.book-card h3{margin:5px 0}.book-card p,.book-card small{margin:0;color:var(--muted)}.eyebrow{font-size:11px;text-transform:uppercase;color:var(--primary);font-weight:700}.availability{margin-top:12px;font-size:13px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.form-grid label{display:grid;gap:7px;font-size:13px;font-weight:600}.span-2{grid-column:span 2}.actions{display:flex;justify-content:flex-end;align-items:end;gap:10px}.alert{padding:12px 14px;border-radius:10px;margin-bottom:18px}.success{background:#ecfdf5;color:#047857}.error{background:#fef2f2;color:#b91c1c}.empty{text-align:center;color:var(--muted);padding:30px}.guest-body{min-height:100vh;background:radial-gradient(circle at top left,#dbeafe,transparent 35%),linear-gradient(135deg,#f8fafc,#eef2ff);display:grid;place-items:center}.auth-shell{width:min(430px,calc(100% - 30px))}.login-card{background:#fff;border:1px solid var(--border);border-radius:22px;padding:34px;box-shadow:0 20px 60px rgba(15,23,42,.12)}.login-logo{width:58px;height:58px;margin-bottom:20px}.login-card h1{margin:0 0 7px}.login-card>p,.login-card>small{color:var(--muted)}.login-card form{display:grid;gap:16px;margin:25px 0}.login-card label{display:grid;gap:7px;font-size:13px;font-weight:600}@media(max-width:1000px){.stats{grid-template-columns:repeat(2,1fr)}.cards-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:720px){.sidebar{transform:translateX(-100%);transition:.2s}.sidebar.open{transform:none}.app{margin-left:0}.menu-button{display:block}.page{padding:18px}.topbar{padding:0 18px}.stats,.cards-grid,.form-grid{grid-template-columns:1fr}.span-2{grid-column:auto}.panel-head{align-items:stretch;flex-direction:column}.search{max-width:none}.book-card{align-items:flex-start}}