:root{
  --bg:#f4f6f8; --panel:#fff; --line:#dfe5ea; --text:#1c2733; --muted:#64748b;
  --accent:#0f766e; --accent-d:#0b5b55; --accent-l:#e1f3f1; --danger:#b42318; --warn:#b45309; --ok:#15803d;
  --side:#14232e; --side-t:#c7d3dc;
  --radius:6px; --shadow:0 1px 2px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0f161c;--panel:#17212a;--line:#2a3743;--text:#e5ecf1;--muted:#93a4b3;--accent:#2dd4bf;--accent-d:#5eead4;--accent-l:#12332f;--danger:#f87171;--warn:#fbbf24;--ok:#4ade80;--side:#0b1217}
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font:14px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}
h1{font-size:18px;margin:0;font-weight:600}
h2{font-size:15px;margin:0 0 8px;font-weight:600}
h3{font-size:13px;margin:12px 0 6px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.shell{display:grid;grid-template-columns:200px 1fr;min-height:100vh}
.side{background:var(--side);color:var(--side-t);display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{padding:14px 16px;font-weight:700;color:#fff;font-size:14px;border-bottom:1px solid rgba(255,255,255,.08)}
.brand small{display:block;font-weight:400;opacity:.6;font-size:11px}
.side nav{padding:8px 6px;flex:1}
.side nav a{display:block;padding:7px 10px;border-radius:5px;color:var(--side-t);text-decoration:none;margin-bottom:1px}
.side nav a:hover{background:rgba(255,255,255,.07)}
.side nav a.active{background:var(--accent);color:#fff}
.side-foot{padding:10px 14px;font-size:12px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between}
.side-foot a{color:var(--side-t)}
.main{min-width:0}
.top{display:flex;align-items:center;gap:12px;padding:10px 20px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top-actions{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.burger{display:none;background:none;border:0;font-size:20px;color:var(--text);cursor:pointer}
.content{padding:16px 20px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;box-shadow:var(--shadow);margin-bottom:14px}
.grid{display:grid;gap:12px}
.cols-2{grid-template-columns:1fr 1fr}.cols-3{grid-template-columns:repeat(3,1fr)}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:14px}
.kpi{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:8px 12px}
.kpi b{display:block;font-size:22px;font-weight:600;line-height:1.2}
.kpi span{color:var(--muted);font-size:12px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border:1px solid var(--line);border-radius:5px;background:var(--panel);color:var(--text);font:inherit;cursor:pointer;text-decoration:none}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-d)}
.btn.danger{color:var(--danger);border-color:var(--danger)}
.btn.small{padding:3px 8px;font-size:12px}
.btn:disabled{opacity:.5;cursor:default}
input,select,textarea{font:inherit;color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:6px 8px;max-width:100%}
input:focus,select:focus,textarea:focus,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
label{display:block;font-size:12px;color:var(--muted);margin-bottom:8px}
label input,label select,label textarea{display:block;width:100%;margin-top:3px;color:var(--text)}
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0 12px}
.form-grid .wide{grid-column:1/-1}
table{border-collapse:collapse;width:100%}
th,td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{font-size:12px;color:var(--muted);font-weight:600;white-space:nowrap}
th a{color:inherit;text-decoration:none}
tr:hover td{background:var(--accent-l)}
.num{text-align:right;font-variant-numeric:tabular-nums}
.badge{display:inline-block;padding:1px 8px;border-radius:99px;font-size:11px;color:#fff;background:var(--muted)}
.tag{display:inline-block;padding:1px 7px;border-radius:4px;font-size:11px;background:var(--accent-l);color:var(--accent-d)}
.muted{color:var(--muted)}
.alert{padding:8px 12px;border-radius:5px;margin-bottom:10px;border:1px solid}
.alert.err{background:#fef3f2;color:#b42318;border-color:#fecdca}
.alert.warn{background:#fffaeb;color:#93370d;border-color:#fedf89}
.alert.ok{background:#ecfdf3;color:#05603a;border-color:#a6f4c5}
@media (prefers-color-scheme: dark){.alert.err{background:#3a1512}.alert.warn{background:#3a2a0d}.alert.ok{background:#0d2e1b}}
.tabs{display:flex;gap:2px;border-bottom:1px solid var(--line);margin-bottom:12px;flex-wrap:wrap}
.tabs a{padding:7px 14px;text-decoration:none;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}
.tabs a.active{color:var(--accent);border-color:var(--accent);font-weight:600}
.toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.toolbar .grow{flex:1}
.toasts{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:8px;z-index:200}
.toast{background:var(--text);color:var(--bg);padding:8px 14px;border-radius:5px;box-shadow:0 4px 14px rgba(0,0,0,.25);max-width:380px}
.toast.err{background:var(--danger);color:#fff}
/* Modal */
.modal-back{position:fixed;inset:0;background:rgba(10,18,26,.55);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal{background:var(--panel);border-radius:8px;max-width:520px;width:100%;max-height:92vh;overflow:auto;box-shadow:0 18px 50px rgba(0,0,0,.35)}
.modal header{padding:12px 16px;border-bottom:1px solid var(--line);font-weight:600}
.modal .body{padding:14px 16px}
.modal footer{padding:10px 16px;border-top:1px solid var(--line);display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.modal footer .left{margin-right:auto}
/* Login */
.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px}
.login{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:24px;width:100%;max-width:340px;box-shadow:var(--shadow)}
.login h1{margin-bottom:14px;font-size:20px}
.login .btn{width:100%;justify-content:center;margin-top:6px}
.captcha{display:flex;gap:8px;align-items:center;margin-top:3px}.captcha input{margin:0}
/* Verfügbarkeit */
.availwrap{display:grid;grid-template-columns:minmax(280px,340px) 1fr;gap:16px;align-items:start}
.month-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;font-weight:600}
.month{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;user-select:none}
.month .dow{font-size:11px;color:var(--muted);text-align:center;padding:2px 0}
.month .day{height:34px;border:1px solid var(--line);border-radius:4px;background:var(--panel);cursor:pointer;font:inherit;padding:0;position:relative}
.month .day.other{opacity:.35}
.month .day.has::after{content:"";position:absolute;left:50%;bottom:3px;width:5px;height:5px;margin-left:-2.5px;border-radius:50%;background:var(--ok)}
.month .day.sel{background:var(--accent);color:#fff;border-color:var(--accent)}
.month .day.today{font-weight:700;border-color:var(--text)}
.windows .win{display:flex;gap:6px;align-items:center;margin-bottom:6px}
.windows select{width:auto}
.avail-list .d{margin-bottom:8px}.avail-list .d b{display:block}
.chips{display:flex;flex-wrap:wrap;gap:4px}
.chip{padding:2px 8px;border:1px solid var(--line);border-radius:99px;background:var(--bg);cursor:pointer;font-size:12px}
/* Wochenkalender */
.weekbar{display:flex;align-items:center;gap:10px;margin-bottom:8px;flex-wrap:wrap}
.weekbar .kw{font-weight:600;min-width:200px;text-align:center}
.wk{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);overflow:auto;max-height:calc(100vh - 210px)}
.wk-head,.wk-body{display:grid;grid-template-columns:48px repeat(7,minmax(104px,1fr));min-width:830px}
.wk-head{position:sticky;top:0;z-index:5;background:var(--panel);border-bottom:1px solid var(--line)}
.wk-head div{padding:5px 6px;border-left:1px solid var(--line);font-size:12px;line-height:1.3}
.wk-head div b{display:block;font-size:13px}
.wk-head .today{background:var(--accent-l)}
.wk-time{position:relative}
.wk-time span{position:absolute;right:5px;font-size:10px;color:var(--muted);transform:translateY(-6px)}
.wk-col{position:relative;border-left:1px solid var(--line);cursor:cell}
.wk-line{position:absolute;left:0;right:0;border-top:1px solid var(--line);opacity:.55;pointer-events:none}
.wk-line.h{opacity:1}
.wk-off{position:absolute;left:0;right:0;background:repeating-linear-gradient(135deg,rgba(100,116,139,.12) 0 6px,transparent 6px 12px);pointer-events:none}
.wk-block{position:absolute;left:0;right:0;background:rgba(180,35,24,.14);border-left:3px solid var(--danger);font-size:11px;padding:1px 4px;color:var(--danger);pointer-events:none;overflow:hidden}
.appt{position:absolute;left:2px;right:2px;border-radius:5px;background:var(--accent);color:#fff;padding:3px 6px;font-size:12px;line-height:1.25;overflow:hidden;cursor:grab;border:1px solid rgba(0,0,0,.18);touch-action:none}
.appt b{display:block;font-weight:600;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}
.appt.p-hoch{background:#c2410c}.appt.p-pruefungsnah{background:#1d4ed8}
.appt.fixed{background:#64748b;cursor:pointer;opacity:.85}
.appt.drag{opacity:.75;z-index:30;cursor:grabbing;box-shadow:0 6px 18px rgba(0,0,0,.3)}
.appt.preview{outline:2px dashed #fff;outline-offset:-4px}
.appt.moving{outline:3px solid #facc15}
.appt.chosen-slot{box-shadow:0 0 0 3px #facc15}
.legend{display:flex;gap:12px;font-size:12px;color:var(--muted);flex-wrap:wrap;margin:6px 0}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:4px;vertical-align:-1px}
.dbg li{margin-bottom:4px}
.pill-bad{color:var(--danger)}.pill-ok{color:var(--ok)}
@media (max-width:900px){
  .shell{grid-template-columns:1fr}
  .side{position:fixed;left:0;top:0;bottom:0;width:220px;transform:translateX(-100%);transition:transform .2s;z-index:60}
  .side.open{transform:none}
  .burger{display:block}
  .cols-2,.cols-3,.availwrap{grid-template-columns:1fr}
  .content{padding:12px}
}