:root{--bg: #f6f7f9;--card: #ffffff;--border: #e5e7eb;--text: #111827;--muted: #6b7280;--primary: #0f766e;--primary-hover: #115e59;--green: #16a34a;--green-bg: #dcfce7;--red: #dc2626;--red-bg: #fee2e2;--amber: #d97706;--amber-bg: #fef3c7;--blue: #2563eb;--blue-bg: #dbeafe}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer;background:var(--primary);color:#fff;border:none;border-radius:6px;padding:8px 14px}button:hover{background:var(--primary-hover)}button.secondary{background:#e5e7eb;color:var(--text)}button.secondary:hover{background:#d1d5db}button.danger{background:var(--red)}button.danger:hover{background:#b91c1c}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{font:inherit;padding:8px 10px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text);width:100%}input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:-1px;border-color:var(--primary)}label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}.app{min-height:100vh;display:flex;flex-direction:column}.nav{background:var(--card);border-bottom:1px solid var(--border);padding:10px 16px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;position:sticky;top:0;z-index:10}.nav .brand{font-weight:700;color:var(--primary);margin-right:12px}.nav a{padding:6px 10px;border-radius:6px;color:var(--text)}.nav a:hover{background:#f3f4f6;text-decoration:none}.nav a.active{background:var(--primary);color:#fff}.nav .spacer{flex:1}.nav .user{color:var(--muted);font-size:14px}.content{padding:16px;max-width:1200px;width:100%;margin:0 auto}.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:16px;margin-bottom:16px}.card h2,.card h3{margin-top:0}h1{margin:0 0 12px;font-size:22px}h2{font-size:18px}h3{font-size:16px;color:var(--muted)}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:end}.row>*{flex:1;min-width:140px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border)}th{background:#f9fafb;font-weight:600;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.04em}td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}.matrix th,.matrix td{text-align:center}.matrix th:first-child,.matrix td:first-child{text-align:left;font-weight:600}.matrix .self{background:#f3f4f6;color:var(--muted)}.matrix .owe{background:#fef3c7;color:var(--amber);font-weight:600}.matrix .zero{color:var(--muted)}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.badge.green{background:var(--green-bg);color:var(--green)}.badge.red{background:var(--red-bg);color:var(--red)}.badge.amber{background:var(--amber-bg);color:var(--amber)}.badge.blue{background:var(--blue-bg);color:var(--blue)}.badge.gray{background:#f3f4f6;color:var(--muted)}.error{background:var(--red-bg);color:var(--red);padding:8px 12px;border-radius:6px;margin-bottom:12px}.success{background:var(--green-bg);color:var(--green);padding:8px 12px;border-radius:6px;margin-bottom:12px}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:16px}.login-wrap .card{width:100%;max-width:360px}.login-wrap h1{text-align:center}.muted{color:var(--muted)}.small{font-size:13px}.right{text-align:right}.section-title{font-size:14px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:8px;font-weight:600}.empty{color:var(--muted);padding:24px;text-align:center}.toolbar{display:flex;gap:8px;align-items:center;margin-bottom:12px;flex-wrap:wrap}.toolbar .spacer{flex:1}.actions{display:flex;gap:6px}.actions button{padding:4px 8px;font-size:13px}@media (max-width: 600px){table{font-size:13px}th,td{padding:6px}.nav{padding:8px}.nav a{padding:6px 8px;font-size:14px}h1{font-size:20px}}