:root{--bg:#f5f6f8;--surface:#fff;--border:#dde1e6;--text:#1a1d23;--text-muted:#667085;--primary:#1f6f50;--primary-hover:#185c41;--danger:#b3261e;--danger-bg:#fdecea;--success-bg:#e8f5ee;--radius:10px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,Tahoma,Arial,sans-serif;font-size:15px;line-height:1.5}a{color:var(--primary)}.page{max-width:880px;margin:0 auto;padding:24px 16px 64px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:10}.topbar h1{font-size:18px;margin:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:20px}.card h2{margin-top:0;font-size:16px}.field{margin-bottom:14px;display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;color:var(--text-muted);font-weight:600}.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));grid-gap:12px;gap:12px}input,select,textarea{font-family:inherit;font-size:15px;padding:9px 11px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);width:100%}input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:1px}label.checkbox{flex-direction:row;align-items:center;gap:8px}label.checkbox input{width:auto}button{font-family:inherit;font-size:15px;font-weight:600;padding:10px 18px;border-radius:8px;border:none;cursor:pointer;background:var(--primary);color:#fff}button:hover{background:var(--primary-hover)}button.secondary{background:transparent;color:var(--text-muted);border:1px solid var(--border)}button.secondary:hover{background:var(--bg)}button:disabled{opacity:.6;cursor:not-allowed}.tabs{display:flex;gap:4px;margin-bottom:20px;border-bottom:1px solid var(--border)}.tab{padding:10px 16px;background:none;color:var(--text-muted);border:none;border-bottom:2px solid transparent;border-radius:0;font-weight:600}.tab:hover{background:none;color:var(--text)}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.alert{padding:10px 14px;border-radius:8px;font-size:14px;margin-bottom:14px}.alert.error{background:var(--danger-bg);color:var(--danger)}.alert.success{background:var(--success-bg);color:var(--primary)}table{width:100%;border-collapse:collapse;font-size:13.5px}td,th{text-align:right;padding:8px 10px;border-bottom:1px solid var(--border)}th{font-weight:600}.muted,th{color:var(--text-muted)}.muted{font-size:13px}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}.login-box{width:100%;max-width:360px}.login-box h1{text-align:center;margin-bottom:24px}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.badge.unpaid{background:var(--danger-bg);color:var(--danger)}.badge.paid{background:var(--success-bg);color:var(--primary)}