:root{
  --orange:#f97316;--orange-hover:#ea580c;--orange-soft:#fff3e8;--orange-border:#fed7aa;
  --ink:#171717;--muted:#6b7280;--line:#e5e7eb;--line-strong:#d1d5db;
  --card:#ffffff;--bg:#f5f6f8;--surface:#ffffff;--surface-2:#f9fafb;
  --ok:#15803d;--bad:#b91c1c;--shadow:0 8px 28px rgba(17,24,39,.06);--shadow-hover:0 14px 34px rgba(17,24,39,.10)
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;font-family:Inter,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.45;min-height:100vh}
a{color:inherit}
.topbar{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.wrap{max-width:1280px;margin:auto;padding:0 24px}
.topin{min-height:68px;display:flex;align-items:center;gap:22px}
.brand{font-weight:900;font-size:20px;letter-spacing:-.5px;white-space:nowrap}.brand span{color:var(--orange)}
nav{display:flex;gap:5px;flex:1;flex-wrap:wrap}
nav a{padding:9px 11px;border-radius:10px;text-decoration:none;color:#4b5563;font-weight:700;font-size:14px;transition:.18s ease}
nav a:hover{background:#f3f4f6;color:var(--ink)}nav a.active{background:var(--orange-soft);color:var(--orange-hover)}
.userbox{font-size:13px;color:var(--muted);text-align:right;white-space:nowrap}.userbox strong{color:var(--ink)}
.main{padding:30px 24px 60px}
.hero{background:linear-gradient(135deg,#fff 0%,#fff 72%,#fff7ed 100%);border:1px solid var(--line);border-radius:22px;padding:30px;box-shadow:var(--shadow);margin-bottom:22px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-70px;top:-90px;width:230px;height:230px;border-radius:50%;background:radial-gradient(circle,rgba(249,115,22,.12),rgba(249,115,22,0) 70%);pointer-events:none}
.hero h1{font-size:34px;margin:0 0 8px;letter-spacing:-1px;position:relative;z-index:1}.hero p{margin:0;color:var(--muted);font-size:16px;position:relative;z-index:1}
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow);transition:border-color .18s ease,box-shadow .18s ease}.card:hover{border-color:var(--line-strong)}
.span3{grid-column:span 3}.span4{grid-column:span 4}.span5{grid-column:span 5}.span6{grid-column:span 6}.span7{grid-column:span 7}.span8{grid-column:span 8}.span12{grid-column:span 12}
.metric{font-size:32px;font-weight:900;margin:8px 0;letter-spacing:-.6px}.muted{color:var(--muted)}
.pill{display:inline-flex;align-items:center;background:var(--orange-soft);color:var(--orange-hover);border:1px solid var(--orange-border);padding:5px 9px;border-radius:999px;font-size:12px;font-weight:800}
.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:11px;padding:10px 15px;font-weight:800;cursor:pointer;text-decoration:none;background:var(--orange);color:#fff;transition:.18s ease}.btn:hover{background:var(--orange-hover);transform:translateY(-1px)}
.btn.secondary{background:var(--surface);color:#374151;border-color:var(--line-strong)}.btn.secondary:hover{background:var(--surface-2);border-color:#fdba74;color:var(--orange-hover)}.btn.danger{background:#b91c1c;color:white}.btn.danger:hover{background:#991b1b}
.actions{display:flex;gap:10px;flex-wrap:wrap}.formgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1/-1}
label{font-size:13px;font-weight:800;color:#374151}input,select,textarea{width:100%;border:1px solid var(--line-strong);border-radius:10px;padding:11px 12px;background:var(--surface);color:var(--ink);font:inherit;transition:.18s ease}textarea{min-height:120px;resize:vertical}input:focus,select:focus,textarea:focus{outline:3px solid rgba(249,115,22,.14);border-color:var(--orange)}
table{width:100%;border-collapse:collapse}th,td{padding:12px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.alert{border-radius:12px;padding:13px 15px;margin:0 0 18px}.alert.ok{background:#ecfdf5;color:#166534;border:1px solid #bbf7d0}.alert.bad{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.question{border:1px solid var(--line);border-radius:18px;padding:22px;background:var(--card);margin-bottom:16px;box-shadow:var(--shadow)}.question h3{margin:10px 0 14px;font-size:20px}.context{background:var(--surface-2);border-left:4px solid var(--orange);padding:14px 16px;border-radius:8px;margin:12px 0 16px;line-height:1.6;color:#374151}
.option{display:flex;gap:10px;padding:11px 12px;border:1px solid var(--line);border-radius:11px;margin:8px 0;background:var(--surface);transition:.15s ease}.option:hover{border-color:#fdba74;background:var(--orange-soft)}.option input{width:auto}
.explanation{background:#fffaf5;border:1px solid var(--orange-border);border-radius:12px;padding:15px;margin-top:12px}.progressbar{height:10px;background:#e5e7eb;border-radius:999px;overflow:hidden}.progressbar>span{display:block;height:100%;background:linear-gradient(90deg,var(--orange),#fb923c);border-radius:999px}
.login{max-width:430px;margin:70px auto}.login .card{padding:30px}.timer{font-size:20px;font-weight:900;color:var(--orange-hover)}.right{text-align:right}.small{font-size:12px}.status-running{color:#c2410c;font-weight:800}.status-finished{color:#15803d;font-weight:800}
.theme-toggle{width:40px;height:40px;border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);font-size:20px;cursor:pointer;box-shadow:none;transition:.18s ease}.theme-toggle:hover{border-color:#fdba74;color:var(--orange)}.theme-toggle-floating{position:fixed;right:22px;top:22px;z-index:20}
.weight-grid{display:flex;flex-direction:column;gap:10px}.weight-row{display:grid;grid-template-columns:minmax(240px,1fr) 120px minmax(260px,1fr);gap:18px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.weight-row:last-child{border-bottom:0}.weight-enabled{display:flex;align-items:center;gap:8px}.weight-enabled input{width:auto}.weight-control{display:grid;grid-template-columns:1fr 62px;gap:12px;align-items:center}.weight-control input[type=range]{padding:0;border:0;background:transparent;accent-color:var(--orange)}.weight-control output{text-align:right;font-weight:900;color:var(--orange-hover)}

html[data-theme="dark"]{
  --ink:#f3f4f6;--muted:#9ca3af;--line:#2c3138;--line-strong:#3b414a;
  --card:#1c2025;--bg:#111418;--surface:#1c2025;--surface-2:#171a1f;
  --orange-soft:#302117;--orange-border:#5a351e;--shadow:0 8px 28px rgba(0,0,0,.22)
}
html[data-theme="dark"] body{background:#111418;color:var(--ink)}
html[data-theme="dark"] .topbar{background:rgba(20,23,27,.94);border-bottom-color:var(--line)}
html[data-theme="dark"] nav a{color:#b6bdc7}html[data-theme="dark"] nav a:hover{background:#23272d;color:#fff}html[data-theme="dark"] nav a.active{background:#302117;color:#fb923c}
html[data-theme="dark"] .userbox strong{color:#f3f4f6}
html[data-theme="dark"] .hero{background:linear-gradient(135deg,#1c2025 0%,#1b1f24 74%,#24201d 100%);border-color:var(--line)}html[data-theme="dark"] .hero:after{background:radial-gradient(circle,rgba(249,115,22,.10),rgba(249,115,22,0) 70%)}
html[data-theme="dark"] .card,html[data-theme="dark"] .question{background:#1c2025;border-color:var(--line)}
html[data-theme="dark"] input,html[data-theme="dark"] select,html[data-theme="dark"] textarea{background:#15181c;color:var(--ink);border-color:var(--line-strong)}html[data-theme="dark"] label{color:#d1d5db}
html[data-theme="dark"] .btn.secondary{background:#20242a;color:#e5e7eb;border-color:#3b414a}html[data-theme="dark"] .btn.secondary:hover{background:#262b32;color:#fb923c;border-color:#7c4725}
html[data-theme="dark"] .context{background:#171a1f;color:#d1d5db;border-left-color:#f97316}html[data-theme="dark"] .explanation{background:#211d1a;border-color:#5a351e}html[data-theme="dark"] .option{background:#191d22;border-color:#333942}html[data-theme="dark"] .option:hover{background:#24201d;border-color:#7c4725}
html[data-theme="dark"] .progressbar{background:#30353d}html[data-theme="dark"] th,html[data-theme="dark"] td{border-bottom-color:#2c3138}html[data-theme="dark"] .theme-toggle{background:#1c2025;border-color:#3b414a}

@media(max-width:900px){.span3,.span4,.span5,.span6,.span7,.span8{grid-column:span 12}.topin{height:auto;padding:12px 0;align-items:flex-start;flex-direction:column}nav{width:100%}.userbox{text-align:left}.formgrid{grid-template-columns:1fr}.main{padding:20px 14px 50px}.wrap{padding:0 14px}.hero{padding:24px}.hero h1{font-size:28px}.weight-row{grid-template-columns:1fr}}
/* ===== v5 Prüfungssimulation (AP1/GA/AP2 Fallstudien) ===== */
.exam-hero .v5-head{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:6px}
.exam-nav{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px}
.exam-nav-item{display:flex;flex-direction:column;gap:2px;padding:9px 12px;border:1px solid var(--line);border-radius:11px;background:var(--surface);text-decoration:none;font-size:13px;line-height:1.3;transition:.15s ease}
.exam-nav-item strong{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.exam-nav-item em{font-style:normal;color:var(--orange-hover);font-weight:800;font-size:12px}
.exam-nav-item:hover{border-color:var(--orange-border);background:var(--orange-soft)}
.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:18px;align-items:start}
.exam-side{position:sticky;top:84px}
.side-card{padding:16px}
.side-card h3{margin:0 0 10px;font-size:15px}
.side-nav{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.side-item{display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:9px;text-decoration:none;font-size:13px;border:1px solid transparent}
.side-item:hover{background:var(--orange-soft)}
.side-num{display:inline-flex;width:22px;height:22px;border-radius:7px;background:var(--orange-soft);color:var(--orange-hover);align-items:center;justify-content:center;font-weight:800;font-size:12px;flex:none}
.side-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.side-status{font-size:11px;color:var(--muted);font-weight:700}
.parent-q{margin:22px 0 12px;padding:0;border:0;background:transparent;box-shadow:none}
.parent-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.parent-head h2{margin:0;font-size:22px;letter-spacing:-.4px}
.sub-q{margin-bottom:14px}
.sub-head{display:flex;align-items:flex-start;gap:10px;flex-wrap:wrap}
.part-label{display:inline-flex;align-items:center;background:var(--ink);color:var(--bg);border-radius:8px;padding:3px 9px;font-weight:900;font-size:13px;flex:none}
.points-badge{display:inline-flex;align-items:center;align-self:center;background:var(--orange-soft);color:var(--orange-hover);border-radius:8px;padding:3px 9px;font-weight:800;font-size:12px;flex:none;margin-left:auto}
.flag-btn{background:transparent;border:0;cursor:pointer;font-size:17px;opacity:.35;transition:.15s ease;padding:2px 4px}
.flag-btn:hover{opacity:.8}.flag-btn.active{opacity:1;transform:scale(1.15)}
.sub-q.flagged{border-color:#f59e0b;box-shadow:0 0 0 2px rgba(245,158,11,.15)}
table.matrix{width:100%;border-collapse:collapse;margin:8px 0}
table.matrix th,table.matrix td{padding:9px 10px;border:1px solid var(--line);text-align:center;font-size:14px}
table.matrix td:first-child,table.matrix th:first-child{text-align:left;font-weight:600}
table.matrix input[type=checkbox]{width:17px;height:17px;accent-color:var(--orange)}
.v5-attachments{margin:12px 0;border:1px dashed var(--line-strong);border-radius:12px;overflow:hidden}
.v5-attachments>summary{cursor:pointer;padding:10px 14px;font-weight:700;font-size:13px;background:var(--surface-2)}
.v5-attach{border-top:1px dashed var(--line)}
.v5-attach>summary{cursor:pointer;padding:9px 14px;font-size:13px;font-weight:600}
.v5-attach pre{margin:0;padding:12px 14px;background:var(--surface-2);overflow-x:auto;font-size:12.5px;line-height:1.5;white-space:pre-wrap}
.exam-submit-card{margin-top:18px}
html[data-theme="dark"] .exam-nav-item{background:#20242a;border-color:#3b414a}
html[data-theme="dark"] .part-label{background:#f3f4f6;color:#111418}
html[data-theme="dark"] table.matrix th,html[data-theme="dark"] table.matrix td{border-color:#2c3138;background:#171a1f}
html[data-theme="dark"] .v5-attachments{border-color:#3b414a}
html[data-theme="dark"] .v5-attach pre{background:#131619}

@media(max-width:900px){
  .exam-layout{grid-template-columns:1fr}
  .exam-side{position:static;order:-1}
  .exam-nav{position:sticky;top:0;z-index:5;background:var(--bg);padding:8px 0;margin:0 -14px 12px;padding-left:14px;padding-right:14px;overflow-x:auto;flex-wrap:nowrap}
  .exam-nav-item{flex:none}
}

@media print{.topbar,.no-print,.btn,.theme-toggle{display:none!important}body{background:white;color:#111}.main{padding:0}.card,.question{box-shadow:none;break-inside:avoid}.wrap{max-width:none;padding:0}}