/* ============================================================
   Regelheft Mathematik – Haupt-Stylesheet (alle Seiten)
   Schriften: fonts.css · Footer: footer.css · Seitenlayouts: seiten.css
   ============================================================ */
  :root{
    --bg: #ffffff;
    --bg-soft: #f6f7f9;
    --ink: #14181f;
    --ink-soft: #4B5565;
    --border: #e6e8ec;
    --accent: #2F5BFF;
    --accent-soft: #EEF3FF;
    --accent-hover: #1E45E0;
    --teal: #0d9488;
    --teal-soft: #e6f6f4;
    --surface: #ffffff;
    --glass: var(--glass);
    --muted: var(--muted);
    --formula: var(--formula);
    --accent-fg: #2F5BFF;
    --danger: #b91c1c; --danger-bg: #fef2f2; --danger-line: #fecaca; --danger-ink: #7f1d1d;
    --star: #D98E00; --star-bg: #FFF5D6;
    --font: 'Poppins',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--bg);
    color:var(--ink);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    -webkit-font-smoothing:antialiased;
    min-height:100vh;
  }
  .top{
    position:sticky;
    top:0;
    z-index:20;
    background:var(--glass);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border);
    padding:18px 18px 14px;
  }
  .top h1{
    font-size:22px;
    font-weight:800;
    margin:0 0 3px;
    letter-spacing:-0.02em;
    color:var(--ink);
  }
  .top .sub{
    font-size:13px;
    color:var(--ink-soft);
    margin:0 0 14px;
  }
  .searchwrap{ position:relative; }
  .searchwrap input{
    width:100%;
    padding:13px 42px 13px 40px;
    border-radius:14px;
    border:1.5px solid var(--border);
    font-size:15px;
    font-family:inherit;
    background:var(--surface);
    color:var(--ink);
    outline:none;
    box-shadow:0 1px 2px rgba(20,24,31,0.04);
    transition:border-color .18s ease, box-shadow .18s ease;
  }
  .searchwrap input::placeholder{
    color:var(--muted);
  }
  .searchwrap input:focus{
    border-color:var(--accent);
    box-shadow:0 0 0 4px var(--accent-soft);
  }
  .searchwrap .icon{
    position:absolute;
    left:14px;
    top:50%;
    transform:translateY(-50%);
    color:var(--muted);
    pointer-events:none;
    transition:color .18s ease;
  }
  .searchwrap input:focus ~ .icon{
    color:var(--accent-fg);
  }
  .searchwrap .clear-btn{
    position:absolute;
    right:7px;
    top:50%;
    transform:translateY(-50%);
    background:var(--bg-soft);
    border:none;
    color:var(--ink-soft);
    font-size:14px;
    width:26px;
    height:26px;
    cursor:pointer;
    display:none;
    align-items:center;
    justify-content:center;
    border-radius:50%;
  }
  .searchwrap .clear-btn:active{ background:var(--border); }
  .chips{
    display:flex;
    gap:7px;
    overflow-x:auto;
    padding:12px 18px 4px;
    scrollbar-width:none;
  }
  .chips::-webkit-scrollbar{display:none;}
  .chip{
    flex:0 0 auto;
    padding:7px 14px;
    border-radius:999px;
    background:var(--bg-soft);
    border:1px solid transparent;
    color:var(--ink-soft);
    font-size:12.5px;
    font-weight:600;
    cursor:pointer;
    white-space:nowrap;
    transition:all .15s ease;
  }
  .chip.active{
    background:var(--accent);
    color:#fff;
  }
  .meta-row{
    padding:14px 18px 6px;
    display:flex;
    justify-content:space-between;
    align-items:baseline;
    color:var(--ink-soft);
    font-size:12.5px;
  }
  .meta-row .count{
    font-weight:700;
    color:var(--ink);
  }
  .list{
    padding:6px 14px 30px;
    display:flex;
    flex-direction:column;
    gap:10px;
    max-width:720px;
    margin:0 auto;
  }
  .rule-card{
    background:var(--surface);
    border-radius:var(--radius-md);
    padding:15px 16px;
    border:1px solid var(--border);
    cursor:pointer;
    transition:border-color .12s ease, transform .12s ease, box-shadow .12s ease;
    position:relative;
    animation:cardIn .22s ease backwards;
  }
  @keyframes cardIn{
    from{ opacity:0; transform:translateY(4px); }
    to{ opacity:1; transform:translateY(0); }
  }
  .rule-card:active{
    transform:scale(0.985);
  }
  .rule-card:hover{
    border-color:var(--accent);
    box-shadow:0 2px 10px rgba(47,91,255,0.08);
  }
  .rule-card .row-top{
    display:flex;
    align-items:center;
    justify-content:space-between;
    margin-bottom:7px;
  }
  .rule-card .cat-pill{
    font-size:11px;
    font-weight:700;
    color:var(--accent-fg);
    background:var(--accent-soft);
    padding:3px 9px;
    border-radius:999px;
  }
  .rule-card .diag-dot{
    width:7px;
    height:7px;
    border-radius:50%;
    background:var(--teal);
    flex:0 0 auto;
  }
  .rule-card h3{
    font-weight:700;
    font-size:16px;
    margin:0 0 5px;
    color:var(--ink);
    line-height:1.35;
    letter-spacing:-0.01em;
  }
  .rule-card p{
    margin:0;
    font-size:13px;
    color:var(--ink-soft);
    line-height:1.45;
    display:-webkit-box;
    -webkit-line-clamp:2;
    -webkit-box-orient:vertical;
    overflow:hidden;
  }
  .empty-state{
    text-align:center;
    padding:60px 20px;
    color:var(--ink-soft);
  }
  .empty-state .big{
    font-size:18px;
    font-weight:700;
    color:var(--ink);
    margin-bottom:6px;
  }

  /* Detail overlay */
  .overlay{
    position:fixed;
    inset:0;
    background:var(--surface);
    z-index:100;
    display:none;
    flex-direction:column;
    overflow-y:auto;
  }
  .overlay.open{display:flex;}
  .overlay-head{
    position:sticky;
    top:0;
    background:var(--glass);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border);
    padding:14px 16px;
    display:flex;
    align-items:center;
    gap:12px;
    z-index:5;
  }
  .overlay-head .back{
    background:var(--bg-soft);
    border:none;
    color:var(--ink);
    width:36px;
    height:36px;
    border-radius:10px;
    font-size:18px;
    cursor:pointer;
    flex:0 0 auto;
    display:flex;
    align-items:center;
    justify-content:center;
  }
  .overlay-head .headcat{
    font-size:12px;
    font-weight:700;
    color:var(--accent-fg);
    background:var(--accent-soft);
    padding:4px 10px;
    border-radius:999px;
  }
  .overlay-body{
    padding:22px 18px 60px;
    max-width:680px;
    margin:0 auto;
    width:100%;
  }
  .overlay-body h2{
    font-size:25px;
    font-weight:800;
    color:var(--ink);
    margin:2px 0 18px;
    line-height:1.28;
    letter-spacing:-0.02em;
  }
  .body-block{ margin-bottom:12px; }
  .prose-line{
    font-size:15.5px;
    line-height:1.65;
    color:var(--ink);
    margin:0 0 10px;
  }
  .bullet-list{
    margin:0 0 14px;
    padding-left:0;
    list-style:none;
  }
  .bullet-list li{
    font-size:15px;
    line-height:1.6;
    color:var(--ink);
    padding-left:20px;
    position:relative;
    margin-bottom:7px;
  }
  .bullet-list li::before{
    content:"";
    position:absolute;
    left:4px;
    top:9px;
    width:5px;
    height:5px;
    border-radius:50%;
    background:var(--teal);
  }
  .formula-block{
    background:var(--accent-soft);
    border-radius:var(--radius-md);
    padding:8px 16px;
    margin:12px 0;
    border-left:3px solid var(--accent);
  }
  .fl{
    display:flex;
    flex-wrap:wrap;
    align-items:baseline;
    justify-content:space-between;
    column-gap:16px;
    padding:7px 0;
    font-family:"Cambria Math","STIX Two Text","Latin Modern Math",Cambria,"Times New Roman",Georgia,serif;
    font-size:18px;
    line-height:1.7;
    color:var(--formula);
  }
  .fl + .fl{ border-top:1px dashed rgba(47,91,255,0.16); }
  .fl-expr{ min-width:0; overflow-wrap:anywhere; }
  .fl-note{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    font-size:12.5px;
    color:var(--ink-soft);
    margin-left:auto;
    padding-left:10px;
    text-align:right;
  }
  .fl-note::before{ content:"| "; color:var(--muted); }
  .frac{ display:inline-flex; flex-direction:column; align-items:center; vertical-align:middle; margin:0 3px; font-size:0.95em; line-height:1.2; }
  .frac .num, .frac .den{ display:block; padding:0 3px; text-align:center; }
  .frac .num{ border-bottom:1.4px solid currentColor; padding-bottom:1px; }
  .frac .den{ padding-top:1px; }
  .sqrt{ display:inline-flex; align-items:stretch; vertical-align:middle; margin:0 2px; white-space:nowrap; }
  .sqrt .rad{ display:block; width:13px; min-height:20px; font-size:0; color:transparent; background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 20' preserveAspectRatio='none'%3E%3Cpath d='M0.6 12.2 L2.6 10.6 L5.2 18.6 L9.9 0.7' fill='none' stroke='%231d1b4f' stroke-width='1.3' stroke-linejoin='round' stroke-linecap='round' vector-effect='non-scaling-stroke'/%3E%3C/svg%3E") no-repeat; background-size:100% 100%; }
  .sqrt .radicand{ display:block; border-top:1.4px solid var(--formula); padding:0 3px 0 1px; line-height:1.3; }
  .sqrt sup.idx{ align-self:flex-start; font-size:0.6em; margin-right:-7px; margin-left:2px; line-height:1; }
  .per{ border-top:1.4px solid currentColor; padding:0 1px; }
  sup, sub{ font-size:0.72em; line-height:0; }
  .pre{
    background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius-md);
    padding:12px 16px; margin:12px 0; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
    font-size:16px; line-height:1.5; width:max-content; max-width:100%; overflow-x:auto;
  }
  .callout{
    background:var(--teal-soft); border-left:3px solid var(--teal); border-radius:var(--radius-md);
    padding:12px 14px; margin:12px 0; font-size:15px; line-height:1.55;
  }
  .subhead{ font-size:13.5px; font-weight:700; color:var(--accent-fg); margin:18px 0 6px; letter-spacing:0; }
  .step{ display:flex; gap:10px; align-items:flex-start; margin:12px 0 4px; font-size:15.5px; line-height:1.55; }
  .step .n{
    flex:0 0 22px; height:22px; border-radius:50%; background:var(--accent); color:#fff;
    font-size:12px; font-weight:700; display:flex; align-items:center; justify-content:center; margin-top:2px;
  }
  .tbl-wrap{ overflow-x:auto; margin:12px 0; border:1px solid var(--border); border-radius:var(--radius-md); }
  .tbl{ border-collapse:collapse; width:100%; font-size:14.5px; }
  .tbl th{ background:var(--bg-soft); text-align:left; font-weight:700; color:var(--ink); }
  .tbl th, .tbl td{ padding:8px 12px; border-bottom:1px solid var(--border); border-right:1px solid var(--border); vertical-align:middle; }
  .tbl tr:last-child td{ border-bottom:none; }
  .tbl th:last-child, .tbl td:last-child{ border-right:none; }
  .prose-line b, .bullet-list b, .callout b{ font-weight:700; }
  .diagram-section{
    margin-top:18px;
  }
  .diagram-section .label{
    font-size:12px;
    font-weight:700;
    color:var(--ink-soft);
    margin-bottom:10px;
    text-transform:none;
  }
  .diagram-frame{
    background:var(--bg-soft);
    border-radius:var(--radius-lg);
    border:1px solid var(--border);
    padding:20px;
    display:flex;
    justify-content:center;
  }
  .diagram-frame svg{
    max-width:320px;
    width:100%;
    height:auto;
  }
  .source-tag{
    font-size:11.5px;
    color:var(--muted);
    margin-top:16px;
  }
  .nav-buttons{
    display:flex;
    gap:10px;
    margin-top:26px;
  }
  .nav-buttons button{
    flex:1;
    padding:13px;
    border-radius:12px;
    border:1px solid var(--border);
    background:var(--surface);
    color:var(--ink);
    font-size:13.5px;
    font-weight:700;
    cursor:pointer;
    font-family:inherit;
  }
  .nav-buttons button:active:not(:disabled){ background:var(--bg-soft); }
  .nav-buttons button:disabled{
    opacity:0.3;
    cursor:default;
  }
  mark{
    background:var(--accent-soft);
    color:var(--accent-hover);
    border-radius:4px;
    padding:1px 3px;
    font-weight:700;
  }

  .news-overlay{ position:fixed; inset:0; z-index:200; background:rgba(20,24,31,0.45); display:none; align-items:center; justify-content:center; padding:20px; }
  .news-overlay.open{ display:flex; }
  .news-card{ background:var(--surface); border-radius:var(--radius-lg); max-width:420px; width:100%; max-height:86vh; overflow-y:auto; padding:24px 22px 20px; box-shadow:0 18px 50px rgba(20,24,31,0.28); animation:newsIn .22s ease; }
  @keyframes newsIn{ from{ opacity:0; transform:translateY(10px) scale(.98); } to{ opacity:1; transform:none; } }
  .news-badge{ display:inline-block; font-size:12px; font-weight:700; color:var(--accent-fg); background:var(--accent-soft); padding:4px 11px; border-radius:999px; }
  .news-card h2{ font-size:22px; font-weight:800; letter-spacing:-0.02em; margin:12px 0 2px; color:var(--ink); }
  .news-date{ font-size:12.5px; color:var(--ink-soft); margin-bottom:14px; }
  .news-card ul{ list-style:none; margin:0 0 16px; padding:0; }
  .news-card li{ font-size:15px; line-height:1.55; color:var(--ink); padding-left:20px; position:relative; margin-bottom:9px; }
  .news-card li::before{ content:""; position:absolute; left:4px; top:9px; width:5px; height:5px; border-radius:50%; background:var(--teal); }
  .news-skip{ display:flex; align-items:center; gap:8px; font-size:13px; color:var(--ink-soft); margin-bottom:14px; cursor:pointer; }
  .news-skip input{ width:16px; height:16px; accent-color:var(--accent); }
  .news-card button{ width:100%; padding:13px; border:none; border-radius:12px; background:var(--accent); color:#fff; font-size:15px; font-weight:700; font-family:inherit; cursor:pointer; }
  .news-card button:active{ background:var(--accent-hover); }

  .ai-open{ display:flex; align-items:center; gap:10px; width:100%; margin-top:12px; padding:12px 14px; border:none; border-radius:var(--radius-md); background:var(--accent-soft); color:var(--accent-fg); font-family:inherit; font-size:15px; font-weight:700; text-align:left; cursor:pointer; }
  .ai-open div span{ font-size:12.5px; font-weight:500; color:var(--ink-soft); display:block; }
  .ai-open:active{ opacity:.8; }
  .ai-sub{ font-size:14.5px; color:var(--ink-soft); line-height:1.55; margin:0 0 14px; }
  .ai-pick{ width:100%; padding:22px 14px; border:2px dashed var(--border); border-radius:var(--radius-md); background:var(--bg-soft); color:var(--accent-fg); font-family:inherit; font-size:15px; font-weight:700; cursor:pointer; }
  .ai-preview{ display:none; position:relative; }
  .ai-preview img{ width:100%; max-height:260px; object-fit:contain; border-radius:var(--radius-md); border:1px solid var(--border); background:#fff; }
  .ai-preview button{ position:absolute; top:8px; right:8px; border:none; border-radius:999px; background:rgba(20,24,31,.65); color:#fff; padding:5px 11px; font-size:12.5px; font-family:inherit; cursor:pointer; }
  #aiOverlay textarea{ width:100%; box-sizing:border-box; margin-top:12px; padding:11px 12px; border:1px solid var(--border); border-radius:var(--radius-sm); font-family:inherit; font-size:15px; color:var(--ink); resize:vertical; background:var(--surface); }
  .ai-btn{ width:100%; margin-top:12px; padding:13px; border:none; border-radius:12px; background:var(--accent); color:#fff; font-size:15px; font-weight:700; font-family:inherit; cursor:pointer; }
  .ai-btn:disabled{ opacity:.4; cursor:default; }
  .ai-btn.ghost{ background:var(--accent-soft); color:var(--accent-fg); }
  .ai-bubble{ margin-top:14px; padding:14px; border-radius:var(--radius-md); background:var(--bg-soft); border:1px solid var(--border); font-size:15px; line-height:1.55; color:var(--ink); }
  .ai-bubble p{ margin:0 0 8px; }
  .ai-bubble.q{ background:var(--teal-soft); border-color:var(--teal); }
  .ai-bubble.muted{ color:var(--ink-soft); }
  .ai-bubble.err{ background:var(--danger-bg); border-color:var(--danger-line); color:var(--danger); }
  .ai-lbl{ font-size:12px; font-weight:700; text-transform:uppercase; letter-spacing:.04em; color:var(--ink-soft); margin-bottom:6px; }
  .ai-you{ color:var(--accent-fg); font-weight:600; }
  .ai-rule{ display:block; width:100%; text-align:left; margin-top:8px; padding:12px 14px; border:1px solid var(--border); border-radius:var(--radius-sm); background:var(--surface); font-family:inherit; cursor:pointer; }
  .ai-rule b{ display:block; font-size:15px; color:var(--ink); }
  .ai-rule span{ font-size:12.5px; color:var(--ink-soft); }
  .ai-rule:active{ background:var(--accent-soft); }
  .ai-dots::after{ content:"…"; animation:aid 1s steps(3) infinite; }
  @keyframes aid{ 0%{ content:"."; } 33%{ content:".."; } 66%{ content:"…"; } }

  .ai-logo{ width:20px; height:20px; vertical-align:-4px; margin-right:7px; }
  .ai-load{ display:flex; align-items:center; gap:12px; }
  .ai-load .ai-logo{ width:32px; height:32px; margin:0; animation:aiPulse 1.8s ease-in-out infinite; }
  .ai-shimmer{ font-weight:600; background:linear-gradient(90deg,#8b97a8 0%,#4285f4 35%,#ea4335 50%,#4285f4 65%,#8b97a8 100%); background-size:250% 100%; -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; color:transparent; animation:aiShim 2.4s linear infinite; }
  @keyframes aiPulse{ 0%,100%{ transform:scale(.8) rotate(0deg); opacity:.7; } 50%{ transform:scale(1.1) rotate(90deg); opacity:1; } }
  @keyframes aiShim{ from{ background-position:250% 0; } to{ background-position:-150% 0; } }
  @media (prefers-reduced-motion:reduce){ .ai-load .ai-logo, .ai-shimmer{ animation:none; } }

  .ai-bar{ display:flex; gap:10px; margin-bottom:6px; }
  .ai-bar .ai-btn{ margin-top:0; }
  #aiHistList{ margin-bottom:6px; }
  .ai-rule.cur{ border-color:var(--accent); background:var(--accent-soft); }
  .ai-thumb{ display:block; max-width:100%; max-height:150px; border-radius:8px; margin:4px 0 8px; border:1px solid var(--border); }
  .ai-model{ margin-top:10px; font-size:12.5px; color:var(--ink-soft); }
  .ai-model b{ color:var(--ink); font-weight:600; }
  .ai-bubble.user{ background:var(--surface); }
  .ai-title{ margin:0 0 12px; font-size:18px; font-weight:800; letter-spacing:-0.01em; color:var(--ink); }
  #aiOverlay textarea{ font-size:16px; }
  .ai-btn.ai-del{ background:var(--danger-bg); color:var(--danger); margin-top:10px; }

  .ai-open.locked{ background:var(--bg-soft); color:var(--muted); }
  .mini{ border:none; border-radius:999px; background:var(--accent-soft); color:var(--accent-fg); font-family:inherit; font-size:13px; font-weight:700; padding:7px 13px; cursor:pointer; }
  .ai-acct{ display:flex; align-items:center; gap:8px; margin-bottom:12px; font-size:13.5px; color:var(--ink-soft); }
  .ai-acct b{ color:var(--ink); }
  .ai-acct > span{ margin-right:auto; }
  .auth-tabs{ display:flex; gap:8px; margin-bottom:6px; }
  .auth-tabs button{ flex:1; padding:11px; border:1px solid var(--border); border-radius:12px; background:var(--surface); font-family:inherit; font-size:15px; font-weight:700; color:var(--ink-soft); cursor:pointer; }
  .auth-tabs button.on{ background:var(--accent-soft); color:var(--accent-fg); border-color:var(--accent); }
  .auth-in{ width:100%; box-sizing:border-box; margin-top:10px; padding:12px; border:1px solid var(--border); border-radius:var(--radius-sm); font-family:inherit; font-size:16px; color:var(--ink); background:var(--surface); }
  .auth-chk{ display:flex; gap:10px; align-items:flex-start; margin-top:12px; font-size:13.5px; line-height:1.45; color:var(--ink-soft); }
  .auth-chk input{ width:18px; height:18px; margin-top:1px; flex:none; accent-color:var(--accent); }
  .auth-err{ color:var(--danger); font-size:14px; margin-top:10px; min-height:1em; }
  .dash-stats{ display:grid; grid-template-columns:repeat(3,1fr); gap:10px; }
  .dash-stat{ background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius-md); padding:12px 6px; text-align:center; }
  .dash-stat b{ display:block; font-size:22px; color:var(--ink); }
  .dash-stat span{ font-size:12px; color:var(--ink-soft); }
  .dash-h{ font-size:12px; font-weight:700; text-transform:uppercase; letter-spacing:.04em; color:var(--ink-soft); margin:20px 0 8px; }
  .dash-row{ position:relative; display:flex; justify-content:space-between; gap:10px; padding:9px 12px; margin-bottom:6px; border:1px solid var(--border); border-radius:10px; background:var(--surface); font-size:14.5px; overflow:hidden; }
  .dash-row i{ position:absolute; left:0; top:0; bottom:0; background:var(--accent-soft); }
  .dash-row span{ position:relative; }
  .toprow{ display:flex; align-items:center; justify-content:space-between; gap:10px; }
  .toprow h1{ min-width:0; }
  .acct-btn{ display:inline-flex; align-items:center; gap:7px; flex:none; max-width:45%; padding:7px 14px 7px 10px; border:none; border-radius:999px; background:var(--accent-soft); color:var(--accent-fg); font-family:inherit; font-size:14px; font-weight:700; cursor:pointer; }
  .acct-btn span{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .acct-menu{ display:none; position:absolute; right:18px; top:52px; z-index:30; min-width:210px; background:var(--surface); border:1px solid var(--border); border-radius:14px; box-shadow:0 10px 30px rgba(20,24,31,.16); padding:10px; }
  .acct-menu.open{ display:block; }
  .acct-menu p{ margin:2px 6px 8px; font-size:13px; color:var(--ink-soft); }
  .acct-menu p b{ color:var(--ink); }
  .acct-menu button{ display:block; width:100%; text-align:left; padding:10px; border:none; background:none; border-radius:10px; font-family:inherit; font-size:15px; font-weight:600; color:var(--ink); cursor:pointer; }
  .acct-menu button:active{ background:var(--accent-soft); }
  .ai-note{ margin:0 0 12px; font-size:12.5px; line-height:1.5; color:var(--ink-soft); }
  .ai-note a, .auth-chk a{ color:var(--accent-fg); text-decoration:underline; cursor:pointer; }
  .legal h3{ font-size:16px; margin:22px 0 6px; color:var(--ink); }
  .legal p, .legal li{ font-size:14.5px; line-height:1.62; color:var(--ink); margin:0 0 8px; }
  .legal ul{ padding-left:20px; margin:6px 0 8px; }
  .legal mark{ background:var(--surface)3b0; color:#8a1c1c; padding:0 4px; border-radius:4px; font-weight:700; }


/* ===== Modernes Theme (Jugendlich, aber seriös) ===== */
:root{
  --radius-lg:24px; --radius-md:18px; --radius-sm:12px;
  --bg-soft:#F4F6FA; --border:#E7EAF0;
  --font:'Poppins',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
body{font-family:var(--font);}
button,input,textarea{font-family:inherit;}
.top{padding:22px 18px 16px;border-bottom:1px solid var(--border);background:var(--glass);backdrop-filter:blur(16px);}
.top h1,.toprow h1{font-size:19px;font-weight:700;letter-spacing:-.025em;line-height:1.15;white-space:nowrap;}
.top .sub{font-size:14px;margin:4px 0 16px;}
.acct-btn{background:var(--accent);color:#fff;font-size:13.5px;font-weight:600;padding:9px 16px 9px 12px;box-shadow:0 6px 16px rgba(47,91,255,.25);}
.searchwrap input{padding:16px 44px 16px 46px;border-radius:18px;background:var(--bg-soft);border:1.5px solid transparent;font-size:15px;box-shadow:none;}
.searchwrap input:focus{background:var(--surface);border-color:var(--accent);box-shadow:0 0 0 5px var(--accent-soft);}
.searchwrap .icon{left:16px;}
.ai-open{margin-top:12px;padding:15px 16px;border-radius:18px;background:linear-gradient(135deg,#2F5BFF 0%,#5E85FF 100%);color:#fff;box-shadow:0 10px 24px rgba(47,91,255,.28);font-weight:600;}
.ai-open div span{color:rgba(255,255,255,.82);}
.ai-open.locked{background:var(--bg-soft);color:var(--muted);box-shadow:none;}
.ai-open.locked div span{color:var(--muted);}
.chips{gap:8px;padding:14px 18px 26px;margin-bottom:-22px;}
.chip{padding:9px 17px;font-size:13px;font-weight:600;background:var(--bg-soft);color:var(--ink-soft);}
.chip.active{background:var(--accent);color:#fff;box-shadow:0 8px 18px rgba(47,91,255,.28);}
.meta-row{padding:16px 20px 8px;}
.list{gap:12px;padding:6px 16px 36px;}
.rule-card{border-radius:20px;padding:18px 18px 17px;border:1px solid var(--border);box-shadow:0 1px 2px rgba(20,24,31,.03);}
.rule-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 14px 30px rgba(47,91,255,.12);}
.rule-card h3{font-size:17px;font-weight:600;letter-spacing:-.02em;line-height:1.3;}
.rule-card .cat-pill{font-weight:600;padding:4px 11px;}
.overlay-head{padding:14px 16px;border-bottom:1px solid var(--border);}
.overlay-head .back{border-radius:14px;width:40px;height:40px;background:var(--bg-soft);}
.overlay-head .headcat{background:var(--accent-soft);color:var(--accent-fg);font-weight:600;}
.overlay-body h2{font-size:28px;font-weight:700;letter-spacing:-.035em;line-height:1.15;}
.formula-block{border-radius:20px;border-left:none;background:var(--accent-soft);padding:12px 20px;}
.callout{border-radius:18px;border-left:none;}
.tbl-wrap{border-radius:18px;}
.diagram-frame{border-radius:22px;}
.nav-buttons button{border-radius:16px;padding:15px;font-weight:600;}
.nav-buttons button:not(:disabled){border-color:var(--accent);color:var(--accent-fg);}
mark{border-radius:6px;}
.news-card{border-radius:28px;}
.news-card button,.ai-btn{border-radius:16px;}
.auth-in{border-radius:14px;}