:root{
  --bg:#f6f7fb;--card:#fff;--text:#172033;--muted:#64748b;--line:#e2e8f0;
  --primary:#2563eb;--primary-dark:#1d4ed8;--green:#16a34a;--red:#dc2626;--amber:#d97706;
  --shadow:0 18px 45px rgba(15,23,42,.10);--radius:22px;
}
*{box-sizing:border-box} body{margin:0;background:linear-gradient(135deg,#f8fafc,#eef2ff);font-family:Inter,Arial,sans-serif;color:var(--text)}
a{color:inherit;text-decoration:none}.container{width:min(1180px,92vw);margin:0 auto}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.86);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.nav-wrap{height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:22px}.brand-icon{width:42px;height:42px;border-radius:14px;background:#dbeafe;display:grid;place-items:center}.nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.nav-links a{font-weight:800;color:#334155}.btn-mini,.btn,.btn-outline{border:0;border-radius:14px;padding:11px 16px;font-weight:900;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-mini,.btn{background:var(--primary);color:#fff}.btn:hover{background:var(--primary-dark)}.btn-outline{border:1px solid var(--line);background:#fff;color:#172033}.btn-green{background:var(--green)}.btn-red{background:var(--red)}.btn-amber{background:var(--amber)}.pill{background:#eff6ff;color:#1d4ed8;border-radius:999px;padding:2px 8px;font-size:12px;font-weight:900}.main-content{padding:34px 0 52px}.hero{border-radius:32px;background:linear-gradient(135deg,#1e3a8a,#2563eb 55%,#0f766e);color:#fff;padding:42px;box-shadow:var(--shadow);display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:center}.hero h1{font-size:46px;line-height:1.04;margin:0 0 12px}.hero p{font-size:18px;opacity:.94}.search-box{display:flex;gap:10px;background:#fff;border-radius:20px;padding:8px;box-shadow:0 10px 25px rgba(0,0,0,.12)}.search-box input,.search-box select,.form-control{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font-size:15px;background:#fff}.section-title{font-size:28px;margin:34px 0 16px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}.book-card,.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.book-card img{width:100%;height:220px;object-fit:cover;background:#e2e8f0}.book-body,.card-body{padding:20px}.book-title{font-size:18px;font-weight:900;margin:0 0 7px}.muted{color:var(--muted)}.price{font-size:22px;font-weight:950;color:#1d4ed8;margin:12px 0}.stock{font-weight:900;font-size:13px}.stock.ok{color:var(--green)}.stock.low{color:var(--amber)}.stock.out{color:var(--red)}.actions{display:flex;gap:10px;flex-wrap:wrap}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.form-group{display:grid;gap:7px}.form-group label{font-weight:900}.auth-card{max-width:520px;margin:0 auto}.alert{border-radius:16px;padding:14px 16px;margin-bottom:16px;font-weight:800}.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.alert-ok{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}table{width:100%;border-collapse:collapse;background:#fff;border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}th,td{padding:14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#f8fafc;font-weight:950;color:#334155}.admin-layout{display:grid;grid-template-columns:250px 1fr;gap:20px}.admin-menu{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:16px;align-self:start;position:sticky;top:92px}.admin-menu a{display:block;padding:12px 14px;border-radius:14px;font-weight:900;color:#334155}.admin-menu a:hover{background:#eff6ff;color:#1d4ed8}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}.stat{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:18px}.stat .num{font-size:30px;font-weight:950}.site-footer{background:#0f172a;color:#cbd5e1;padding:34px 0}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}.footer-grid h3{color:#fff}.badge{display:inline-flex;border-radius:999px;padding:5px 10px;font-weight:900;font-size:12px;background:#e0f2fe;color:#075985}.right{text-align:right}.cover-small{width:54px;height:70px;object-fit:cover;border-radius:10px;background:#e2e8f0}.query-card{margin-bottom:18px}.query-sql{background:#0f172a;color:#dbeafe;border-radius:14px;padding:12px;overflow:auto;font-family:ui-monospace,Consolas,monospace;font-size:13px}.empty{background:#fff;border:2px dashed #cbd5e1;border-radius:20px;text-align:center;padding:36px;color:var(--muted);font-weight:900}
@media(max-width:820px){.hero{grid-template-columns:1fr;padding:28px}.hero h1{font-size:34px}.search-box{flex-direction:column}.form-grid{grid-template-columns:1fr}.admin-layout{grid-template-columns:1fr}.nav-wrap{height:auto;padding:14px 0;align-items:flex-start;flex-direction:column}.nav-links{gap:10px}table{font-size:14px;display:block;overflow:auto}}