:root{--bg:#f5f7fb;--card:#fff;--text:#0f172a;--muted:#64748b;--primary:#2563eb;--border:#e2e8f0;--danger:#dc2626;--success:#16a34a}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}label{display:block;margin:12px 0 6px;font-size:14px;font-weight:700}input,button{font:inherit}input{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:#fff}button.btn,.btn{display:inline-block;background:var(--primary);color:#fff;border:none;padding:12px 16px;border-radius:12px;cursor:pointer}button.btn-block,.btn-block{width:100%}.muted{color:var(--muted)}
.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}.auth-card{background:var(--card);padding:28px;border-radius:18px;box-shadow:0 10px 30px rgba(0,0,0,.08);width:100%;max-width:420px}.auth-card.wide{max-width:700px}.alert{padding:12px 14px;border-radius:12px;margin:0 0 16px}.alert.error{background:#fee2e2;color:#991b1b}.alert.success{background:#dcfce7;color:#166534}
.layout{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{background:#0f172a;color:#fff;padding:24px}.sidebar .brand{font-weight:800;font-size:24px;margin-bottom:20px}.sidebar nav{display:flex;flex-direction:column;gap:10px}.sidebar nav a{color:#cbd5e1;padding:10px 12px;border-radius:10px}.sidebar nav a:hover{background:#1e293b;color:#fff}.content{padding:20px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;background:#fff;padding:14px 18px;border-radius:16px;border:1px solid var(--border)}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}.card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:18px;overflow:auto}.card h3{margin-top:0}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px;border-bottom:1px solid var(--border);font-size:14px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.admin-grid{align-items:start}.pos-grid{align-items:start}.grand-total{font-size:34px;font-weight:800;margin:20px 0}.inline-form{display:flex;gap:10px;margin-bottom:18px}.inline-form input{flex:1}.total-card{position:sticky;top:20px}
@media (max-width: 900px){.layout{grid-template-columns:1fr}.sidebar{padding:16px}.cards{grid-template-columns:1fr 1fr}.grid-2{grid-template-columns:1fr}.content{padding:12px}.topbar{flex-direction:column;gap:8px;align-items:flex-start}}
@media (max-width: 600px){.cards{grid-template-columns:1fr}.auth-card{padding:20px}.grand-total{font-size:28px}}