:root{--bg: #f8fafc;--panel: #ffffff;--ink: #1f2937;--muted: #6b7280;--line: #e5e7eb;--brand: #1f2937;--accent: #2563eb;--ok: #16a34a;--warn: #d97706;--alert: #dc2626;--radius: 10px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}h1{font-size:1.5rem;margin:0 0 1rem}h2{font-size:1.1rem}.muted{color:var(--muted)}.small{font-size:.85rem}.error{color:var(--alert)}.center-screen{min-height:100vh;display:grid;place-items:center;padding:1rem}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1rem}.login-card{width:100%;max-width:360px;display:flex;flex-direction:column;gap:.85rem}.login-card label{display:flex;flex-direction:column;gap:.3rem;font-size:.9rem}input{padding:.6rem .7rem;border:1px solid var(--line);border-radius:8px;font-size:1rem}button{cursor:pointer;border:none;border-radius:8px;padding:.65rem 1rem;font-size:1rem;background:var(--accent);color:#fff}button:disabled{opacity:.6;cursor:default}.link-btn{background:none;color:var(--muted);padding:0;font-size:.9rem}.admin-shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{background:var(--brand);color:#e5e7eb;display:flex;flex-direction:column;padding:1rem}.brand{font-weight:700;font-size:1.2rem;margin-bottom:1.5rem}.sidebar nav{display:flex;flex-direction:column;gap:.25rem;flex:1}.nav-link{color:#cbd5e1;text-decoration:none;padding:.55rem .7rem;border-radius:8px}.nav-link.active{background:#ffffff1f;color:#fff}.sidebar-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid rgba(255,255,255,.15);padding-top:.75rem}.role-badge{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:#94a3b8}.admin-main{padding:1.5rem 2rem;overflow:auto}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem}.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem}.stat-card--alert{border-color:#fecaca;background:#fef2f2}.stat-value{font-size:1.5rem;font-weight:700}.stat-label{color:var(--muted);font-size:.9rem}.data-table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.data-table th,.data-table td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--line);font-size:.9rem}.data-table th{background:#f1f5f9;font-weight:600}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem}.card h3{margin:0 0 .25rem}.badge{display:inline-block;padding:.15rem .5rem;border-radius:999px;font-size:.75rem;background:#e5e7eb;color:#374151}.badge--ok{background:#dcfce7;color:var(--ok)}.badge--warn{background:#fef3c7;color:var(--warn)}.badge--alert{background:#fee2e2;color:var(--alert)}.state-msg{padding:1.5rem;color:var(--muted)}.app-shell{max-width:480px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;background:var(--bg)}.app-header{display:flex;align-items:center;justify-content:space-between;padding:.9rem 1rem;background:var(--brand);color:#fff}.app-header .brand{margin:0}.app-header .link-btn{color:#cbd5e1}.app-main{flex:1;padding:1rem 1rem 5rem;overflow:auto}.section-title{margin:1.25rem 0 .5rem}.summary-card{text-align:center;padding:1.5rem}.summary-card--alert{border-color:#fecaca;background:#fef2f2}.summary-label{color:var(--muted)}.summary-value{font-size:2rem;font-weight:700;margin:.25rem 0}.list-card{display:flex;align-items:center;justify-content:space-between;margin-bottom:.6rem}.amount{font-weight:700}.pay-btn{padding:.5rem .9rem;font-size:.9rem}.banner{background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af;padding:.7rem .9rem;border-radius:8px;margin-bottom:.8rem;font-size:.9rem}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;display:flex;background:var(--panel);border-top:1px solid var(--line)}.tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:.15rem;padding:.55rem 0;text-decoration:none;color:var(--muted);font-size:.75rem}.tab.active{color:var(--accent)}.tab-icon{font-size:1.2rem}