:root{--bg: #0f1117;--bg-card: #1a1d27;--bg-hover: #22263a;--border: #2d3148;--text: #e8eaf6;--text-muted: #6b7280;--accent: #6366f1;--accent-hover: #4f52c9;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--radius: 8px;--shadow: 0 2px 8px rgba(0,0,0,.4)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;font-size:14px;line-height:1.5}.layout{display:flex;min-height:100vh}.sidebar{width:220px;min-height:100vh;background:var(--bg-card);border-right:1px solid var(--border);padding:24px 0;display:flex;flex-direction:column;flex-shrink:0}.sidebar-logo{padding:0 20px 24px;font-size:15px;font-weight:700;color:var(--accent);border-bottom:1px solid var(--border);margin-bottom:12px}.sidebar nav a{display:flex;align-items:center;gap:10px;padding:10px 20px;color:var(--text-muted);text-decoration:none;transition:all .15s;border-left:3px solid transparent}.sidebar nav a:hover{color:var(--text);background:var(--bg-hover)}.sidebar nav a.active{color:var(--accent);border-left-color:var(--accent);background:var(--bg-hover)}.main{flex:1;padding:32px;overflow-y:auto}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.page-title{font-size:22px;font-weight:700}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px;margin-bottom:28px}.stat-card{text-align:center}.stat-card .stat-value{font-size:28px;font-weight:700;margin-bottom:4px}.stat-card .stat-label{color:var(--text-muted);font-size:12px}button,.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;border:none;transition:all .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-ghost:hover{color:var(--text);background:var(--bg-hover)}.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}.btn-danger:hover{background:var(--danger);color:#fff}.btn-success{background:var(--success);color:#fff}.btn-success:hover{opacity:.85}button:disabled{opacity:.5;cursor:not-allowed}.badge{display:inline-flex;align-items:center;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.badge-pending{background:#6366f126;color:var(--accent)}.badge-reminded{background:#f59e0b26;color:var(--warning)}.badge-overdue{background:#ef444426;color:var(--danger)}.badge-paid{background:#10b98126;color:var(--success)}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse}th{text-align:left;padding:10px 14px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);border-bottom:1px solid var(--border)}td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:middle}tr:last-child td{border-bottom:none}tr:hover td{background:var(--bg-hover);cursor:pointer}tr.overdue td{background:#ef44440a}.form-group{margin-bottom:18px}label{display:block;margin-bottom:6px;font-size:13px;color:var(--text-muted);font-weight:500}input,select,textarea{width:100%;padding:9px 12px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:14px;transition:border-color .15s}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}.alert{padding:12px 16px;border-radius:var(--radius);margin-bottom:16px;font-size:13px}.alert-error{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#fca5a5}.alert-success{background:#10b9811a;border:1px solid rgba(16,185,129,.3);color:#6ee7b7}.alert-info{background:#3b82f61a;border:1px solid rgba(59,130,246,.3);color:#93c5fd}.text-muted{color:var(--text-muted)}.text-danger{color:var(--danger)}.text-success{color:var(--success)}.text-warning{color:var(--warning)}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.flex{display:flex}.items-center{align-items:center}.gap-2{gap:8px}.gap-3{gap:12px}.ml-auto{margin-left:auto}.days-indicator{font-size:12px;font-weight:600}.days-ok{color:var(--success)}.days-warning{color:var(--warning)}.days-danger{color:var(--danger)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state h3{font-size:16px;margin-bottom:8px;color:var(--text)}.loading{text-align:center;padding:40px;color:var(--text-muted)}.toggle{position:relative;width:36px;height:20px;flex-shrink:0}.toggle input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--border);border-radius:20px;cursor:pointer;transition:.2s}.toggle-slider:before{content:"";position:absolute;width:14px;height:14px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}.toggle input:checked+.toggle-slider{background:var(--accent)}.toggle input:checked+.toggle-slider:before{transform:translate(16px)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:36px 32px;width:100%;max-width:400px;box-shadow:var(--shadow)}.auth-logo{font-size:18px;font-weight:700;color:var(--accent);text-align:center;margin-bottom:24px}.auth-title{font-size:20px;font-weight:700;text-align:center;margin-bottom:24px}.auth-form{display:flex;flex-direction:column;gap:4px}.auth-forgot{text-align:right;margin-bottom:8px}.auth-forgot a{font-size:13px;color:var(--accent);text-decoration:none}.auth-forgot a:hover{text-decoration:underline}.auth-footer{text-align:center;margin-top:20px;font-size:13px;color:var(--text-muted)}.auth-footer a{color:var(--accent);text-decoration:none}.auth-footer a:hover{text-decoration:underline}.btn-full{width:100%;justify-content:center;padding:11px;margin-top:4px}.sidebar-footer{margin-top:auto;padding:16px 20px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}.sidebar-email{font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar-logout{font-size:13px;padding:6px 12px;width:100%;justify-content:center}@media(max-width:768px){.layout{flex-direction:column;padding-bottom:64px}.sidebar{position:fixed;bottom:0;left:0;right:0;width:100%;min-height:auto;height:64px;flex-direction:row;align-items:center;padding:0;border-right:none;border-top:1px solid var(--border);z-index:100}.sidebar-logo,.sidebar-footer{display:none}.sidebar nav{display:flex;flex-direction:row;width:100%;height:100%}.sidebar nav a{flex:1;flex-direction:column;justify-content:center;padding:8px 4px;font-size:11px;gap:4px;border-left:none;border-top:3px solid transparent;text-align:center}.sidebar nav a.active{border-left-color:transparent;border-top-color:var(--accent)}.main{padding:16px}.page-header{flex-direction:column;align-items:flex-start;gap:12px}.form-row{grid-template-columns:1fr}.card-grid{grid-template-columns:repeat(2,1fr)}.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}.stat-card .stat-value{font-size:22px}.auth-card{padding:28px 20px}.form-actions{flex-direction:column}.form-actions .btn{width:100%;justify-content:center}}@media(max-width:480px){.card-grid{grid-template-columns:1fr}.page-title{font-size:18px}}