:root[data-theme="dark"]{
  --bg:#0f172a;--panel:#111827;--card:#182235;--text:#e5e7eb;--muted:#9ca3af;--line:rgba(255,255,255,.08);--accent:#3b82f6;--danger:#ef4444;--green:#22c55e;
}
:root[data-theme="light"]{
  --bg:#f5f7fb;--panel:#ffffff;--card:#ffffff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#2563eb;--danger:#dc2626;--green:#16a34a;
}
*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,Arial,sans-serif}
body{background:var(--bg);color:var(--text)}
.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh}
.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:28px}
.brand{display:flex;gap:14px;align-items:center;margin-bottom:34px}
.brand-logo{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,#2563eb,#7c3aed);display:grid;place-items:center;font-weight:800}
.brand span{display:block;color:var(--muted);font-size:13px}
nav{display:grid;gap:10px}
nav a,.mobile-menu a{color:var(--text);text-decoration:none;padding:13px 14px;border-radius:14px}
nav a:hover,.mobile-menu a:hover{background:rgba(59,130,246,.16)}
.main{padding:32px;min-width:0}
.topbar{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:26px}
.btn{background:var(--accent);border:none;color:white;padding:12px 16px;border-radius:14px;text-decoration:none;font-weight:700;display:inline-block;cursor:pointer;text-align:center}
.btn.secondary{background:transparent;border:1px solid var(--line);color:var(--text)}
.btn.danger{background:var(--danger)}
.btn.green{background:var(--green)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:24px}
.card,.panel{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:0 16px 40px rgba(0,0,0,.12)}
.card span{color:var(--muted);font-size:14px}.card strong{display:block;font-size:30px;margin-top:10px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
form{display:grid;gap:14px}
input,textarea,select{background:transparent;color:var(--text);border:1px solid var(--line);border-radius:14px;padding:14px;font-size:15px;width:100%}
textarea{min-height:110px}
table{width:100%;border-collapse:collapse}
th,td{padding:15px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
th{color:var(--muted);font-weight:600}
.badge{padding:7px 12px;border-radius:999px;background:rgba(59,130,246,.18);color:#93c5fd;font-size:13px}
.badge.bezahlt{background:rgba(34,197,94,.18);color:#86efac}
.badge.überfällig{background:rgba(239,68,68,.18);color:#fca5a5}
.notice{padding:14px;border-radius:14px;background:rgba(34,197,94,.12);color:#86efac;margin-bottom:16px}
.error{padding:14px;border-radius:14px;background:rgba(239,68,68,.12);color:#fca5a5;margin-bottom:16px}
.invoice-preview{background:white;color:#111827;border-radius:18px;padding:32px;line-height:1.7;overflow-x:auto}
.invoice-head{display:flex;justify-content:space-between;margin-bottom:28px;gap:20px}
.logo-box{width:64px;height:64px;border-radius:18px;background:#111827;color:white;display:grid;place-items:center;font-weight:800}
.auth{min-height:100vh;display:grid;place-items:center;padding:24px}
.auth-card{width:100%;max-width:420px;background:var(--card);border:1px solid var(--line);padding:30px;border-radius:24px}
.mobile-header{display:none}
.mobile-menu{display:none}
.table-scroll{overflow-x:auto;width:100%}
.item-row{display:grid;grid-template-columns:2fr .8fr 1fr .8fr auto;gap:10px;align-items:center}
.chart-box{height:220px;display:flex;align-items:end;gap:10px;border-top:1px solid var(--line);padding-top:20px}
.bar{background:linear-gradient(180deg,#3b82f6,#7c3aed);border-radius:12px 12px 0 0;min-width:28px;flex:1}
@media(max-width:1000px){
  .app{grid-template-columns:1fr}
  .sidebar{display:none}
  .mobile-header{display:flex;position:sticky;top:0;z-index:50;background:var(--panel);border-bottom:1px solid var(--line);padding:14px 18px;justify-content:space-between;align-items:center}
  .mobile-brand{font-weight:800;font-size:18px}
  .hamburger{background:var(--accent);color:white;border:none;border-radius:12px;padding:10px 14px;font-size:20px}
  .mobile-menu{display:none;background:var(--panel);border-bottom:1px solid var(--line);padding:10px;position:sticky;top:61px;z-index:49}
  .mobile-menu.open{display:grid;gap:6px}
  .main{padding:18px}
  .grid-4,.grid-2{grid-template-columns:1fr}
  .topbar{align-items:flex-start;flex-direction:column}
  .card,.panel{padding:20px;border-radius:20px}
  .card strong{font-size:34px}
  h1{font-size:34px}
  table{min-width:760px}
  .invoice-head{flex-direction:column}
  .item-row{grid-template-columns:1fr}
}
@media(max-width:420px){.main{padding:14px}.card,.panel{padding:18px}h1{font-size:30px}.btn{width:100%}.actions{display:grid}}
@media print{.sidebar,.topbar,.btn,.mobile-header,.mobile-menu{display:none!important}.app{display:block}.main{padding:0}.invoice-preview{box-shadow:none;border-radius:0}}