*,*:before,*:after{box-sizing:border-box}:root{--color-primary: #6366f1;--color-secondary: #8b5cf6;--color-primary-dark: #4f46e5;--color-text: #1e293b;--color-text-muted: #64748b;--color-border: #e2e8f0;--color-bg: #f8fafc;--color-surface: #ffffff;--color-success: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--radius: 10px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--nav-width: 240px}html,body{height:100%;margin:0;font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,sans-serif;background:var(--color-bg);color:var(--color-text);font-size:15px}#root{height:100%}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;font-family:inherit}input,textarea,select{font-family:inherit;font-size:14px;border:1.5px solid var(--color-border);border-radius:8px;padding:9px 13px;width:100%;outline:none;background:#fff;color:var(--color-text);transition:border-color .15s}input:focus,textarea:focus,select:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--color-primary) 12%,transparent)}.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 18px;border-radius:8px;font-size:14px;font-weight:600;border:none;transition:opacity .15s,transform .1s}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.55;pointer-events:none}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark)}.btn-outline{background:transparent;border:1.5px solid var(--color-border);color:var(--color-text)}.btn-outline:hover{background:var(--color-bg)}.btn-danger{background:var(--color-danger);color:#fff}.btn-sm{padding:6px 13px;font-size:13px}.btn-full{width:100%;justify-content:center}.card{background:var(--color-surface);border-radius:var(--radius);border:1px solid var(--color-border);box-shadow:var(--shadow);padding:20px}.badge{display:inline-flex;align-items:center;padding:2px 9px;border-radius:99px;font-size:12px;font-weight:600}.badge-green{background:#dcfce7;color:#166534}.badge-yellow{background:#fef9c3;color:#854d0e}.badge-red{background:#fee2e2;color:#991b1b}.badge-blue{background:#dbeafe;color:#1e40af}.badge-gray{background:#f1f5f9;color:#475569}.badge-purple{background:#ede9fe;color:#5b21b6}.label{display:block;font-size:13px;font-weight:600;color:var(--color-text-muted);margin-bottom:5px}.form-group{margin-bottom:16px}.alert{padding:11px 15px;border-radius:8px;font-size:13.5px;margin-bottom:16px}.alert-error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}.alert-success{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}.alert-info{background:#eff6ff;color:#1e40af;border:1px solid #bfdbfe}.app-layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--nav-width);background:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;flex-shrink:0;overflow-y:auto}.sidebar-header{padding:20px 18px 16px;border-bottom:1px solid var(--color-border)}.sidebar-logo{font-size:15px;font-weight:700;color:var(--color-primary)}.sidebar-subtitle{font-size:12px;color:var(--color-text-muted);margin-top:2px}.sidebar-nav{padding:10px;flex:1}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--color-text-muted);cursor:pointer;text-decoration:none;transition:background .12s,color .12s;margin-bottom:2px;position:relative}.nav-item:hover,.nav-item.active{background:color-mix(in srgb,var(--color-primary) 9%,transparent);color:var(--color-primary);text-decoration:none}.nav-item svg{flex-shrink:0}.nav-badge{margin-left:auto;background:var(--color-danger);color:#fff;border-radius:99px;font-size:11px;font-weight:700;padding:1px 7px;min-width:20px;text-align:center}.main-content{flex:1;overflow-y:auto;display:flex;flex-direction:column}.page-header{padding:24px 28px 0}.page-header h1{font-size:22px;font-weight:700;margin:0 0 4px}.page-header p{color:var(--color-text-muted);font-size:14px;margin:0}.page-body{padding:20px 28px 40px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--color-surface);border-radius:var(--radius);border:1px solid var(--color-border);padding:18px}.stat-label{font-size:12px;font-weight:600;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px}.stat-value{font-size:26px;font-weight:700;color:var(--color-text)}.stat-sub{font-size:12px;color:var(--color-text-muted);margin-top:2px}.table{width:100%;border-collapse:collapse}.table th{text-align:left;font-size:12px;font-weight:600;color:var(--color-text-muted);padding:9px 14px;border-bottom:1px solid var(--color-border);text-transform:uppercase;letter-spacing:.04em}.table td{padding:12px 14px;border-bottom:1px solid var(--color-border);font-size:14px;vertical-align:middle}.table tr:last-child td{border-bottom:none}.table tbody tr:hover{background:#f8fafc}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--color-bg)}.auth-card{width:100%;max-width:420px;background:var(--color-surface);border-radius:16px;box-shadow:var(--shadow-md);padding:36px;border:1px solid var(--color-border)}.auth-logo{text-align:center;margin-bottom:28px}.auth-logo img{height:48px;margin-bottom:10px}.auth-logo h1{font-size:20px;font-weight:700;color:var(--color-primary);margin:0 0 4px}.auth-logo p{font-size:13px;color:var(--color-text-muted);margin:0}.auth-card h2{font-size:18px;font-weight:700;margin:0 0 20px;text-align:center}.auth-footer{text-align:center;font-size:13px;color:var(--color-text-muted);margin-top:16px}.messages-layout{display:flex;gap:16px}.messages-list{width:300px;flex-shrink:0}.message-item{padding:14px;border-radius:8px;border:1.5px solid var(--color-border);cursor:pointer;margin-bottom:8px;transition:border-color .15s}.message-item:hover,.message-item.active{border-color:var(--color-primary);background:color-mix(in srgb,var(--color-primary) 5%,transparent)}.message-item.unread{font-weight:600}.message-thread{flex:1;min-height:400px}.message-bubble{max-width:80%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5;margin-bottom:10px}.message-bubble.mieter{background:var(--color-primary);color:#fff;margin-left:auto;border-radius:12px 12px 2px}.message-bubble.verwaltung{background:#f1f5f9;color:var(--color-text);border-radius:12px 12px 12px 2px}.spinner{width:36px;height:36px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .7s linear infinite;margin:40px auto}@keyframes spin{to{transform:rotate(360deg)}}.loading-page{display:flex;align-items:center;justify-content:center;height:100%;flex-direction:column;gap:12px;color:var(--color-text-muted);font-size:14px}.timeline{list-style:none;padding:0;margin:0}.timeline-item{display:flex;gap:12px;padding-bottom:16px;position:relative}.timeline-item:before{content:"";position:absolute;left:13px;top:24px;width:2px;height:calc(100% - 24px);background:var(--color-border)}.timeline-item:last-child:before{display:none}.timeline-dot{width:26px;height:26px;border-radius:50%;border:2px solid var(--color-border);background:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.timeline-dot.active{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.timeline-dot.done{border-color:var(--color-success);background:var(--color-success);color:#fff}@media(max-width:768px){.sidebar{display:none}.page-header{padding:16px 16px 0}.page-body{padding:14px 16px 80px}.stats-grid{grid-template-columns:1fr 1fr}.messages-layout{flex-direction:column}.messages-list{width:100%}}