:root{
    --serif:'Iowan Old Style','Palatino Linotype',Palatino,'Book Antiqua',Georgia,serif;
    --sans:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
    --paper:#EFF3F2;
    --paper-2:#E3E9E7;
    --ink:#16222E;
    --ink-soft:#42505C;
    --amber:#F2A93B;
    --slate:#2B4C5C;
    --slate-deep:#16222E;
    --rust:#B5502E;
    --line:#CBD5D2;
    --white:#FBFCFB;
    --radius:3px;
    box-sizing:border-box;
    padding-top:env(safe-area-inset-top,0px);
    padding-bottom:env(safe-area-inset-bottom,0px);
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --paper:#12171B; --paper-2:#182027; --ink:#EDEFEC; --ink-soft:#B8C2C6;
      --white:#1B2229; --line:#2C363C; --slate:#7FA7BC;
    }
  }
  :root[data-theme="dark"]{
    --paper:#12171B; --paper-2:#182027; --ink:#EDEFEC; --ink-soft:#B8C2C6;
    --white:#1B2229; --line:#2C363C; --slate:#7FA7BC;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth; scroll-padding-top:calc(72px + env(safe-area-inset-top,0px));}
  body{
    margin:0; background:var(--paper); color:var(--ink);
    font-family:var(--sans); line-height:1.6; -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.serif{font-family:var(--serif);}
  h1{font-size:clamp(2.1rem,4.6vw,3.4rem); font-weight:500; line-height:1.1; margin:0 0 .5rem;}
  h2{font-size:clamp(1.5rem,2.6vw,2rem); font-weight:500; margin:0 0 1rem; letter-spacing:-.01em;}
  h3{font-size:1.1rem; font-weight:600; margin:0 0 .4rem; font-family:var(--sans);}
  p{margin:0 0 1rem;}
  a{color:var(--slate);}
  .wrap{max-width:1040px; margin:0 auto; padding:0 24px;}
  .prose{max-width:66ch;}
  :focus-visible{outline:2px solid var(--amber); outline-offset:2px;}
  @media (prefers-reduced-motion: reduce){ *{animation:none!important; transition:none!important; scroll-behavior:auto!important;} }

  header{
    position:sticky; top:0; z-index:40; background:var(--paper);
    border-bottom:1px solid var(--line);
    padding-top:env(safe-area-inset-top,0px);
  }
  .nav{display:flex; align-items:center; justify-content:space-between; padding:16px 24px; max-width:1040px; margin:0 auto;}
  .brand{display:flex; align-items:center; gap:9px; font-family:var(--serif); font-weight:600; font-size:1.25rem; text-decoration:none; color:var(--ink);}
  .brand .dot{width:9px; height:9px; border-radius:50%; background:var(--amber); display:inline-block;}
  .navlinks{display:flex; gap:28px; list-style:none; margin:0; padding:0;}
  .navlinks a{text-decoration:none; color:var(--ink-soft); font-size:.94rem; font-weight:500;}
  .navlinks a:hover{color:var(--ink);}
  .navtoggle{display:none; background:none; border:1px solid var(--line); border-radius:var(--radius); padding:8px 10px; color:var(--ink); font-size:1rem;}
  @media (max-width:720px){
    .navlinks{position:absolute; top:100%; left:0; right:0; background:var(--paper); flex-direction:column; gap:0; border-bottom:1px solid var(--line); display:none;}
    .navlinks.open{display:flex;}
    .navlinks a{display:block; padding:14px 24px; border-top:1px solid var(--line);}
    .navtoggle{display:block;}
  }

  .hero{padding:56px 0 40px; border-bottom:1px solid var(--line);}
  .hero-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:48px; align-items:center;}
  @media (max-width:800px){.hero-grid{grid-template-columns:1fr;}}
  .kicker{color:var(--slate); font-weight:600; font-size:.95rem; margin-bottom:10px;}
  .hero p.lead{font-size:1.14rem; color:var(--ink-soft); max-width:52ch;}
  .badges{display:flex; flex-wrap:wrap; gap:10px; margin:22px 0 26px;}
  .badge{display:flex; align-items:center; gap:7px; background:var(--white); border:1px solid var(--line); padding:9px 14px; border-radius:var(--radius); font-size:.88rem; font-weight:500;}
  .btn{display:inline-block; background:var(--ink); color:var(--paper); text-decoration:none; padding:13px 24px; border-radius:var(--radius); font-weight:600; font-size:.98rem; border:1px solid var(--ink);}
  .btn:hover{background:var(--slate); border-color:var(--slate); color:#fff;}
  .btn.secondary{background:transparent; color:var(--ink); border-color:var(--line);}
  .btn.secondary:hover{border-color:var(--ink); background:transparent; color:var(--ink);}
  .hero-cta{display:flex; gap:12px; flex-wrap:wrap;}
  .hero-art{width:100%; height:auto;}

  .why{padding:44px 0; background:var(--paper-2); border-bottom:1px solid var(--line);}
  .why-grid{display:grid; grid-template-columns:1fr 1fr; gap:40px; align-items:start;}
  @media (max-width:760px){.why-grid{grid-template-columns:1fr;}}
  .why-grid p{color:var(--ink-soft);}

  .guide{padding:60px 0;}
  .stand{color:var(--ink-soft); font-size:.88rem; max-width:66ch; margin:-1rem 0 1.5rem;}
  .guide-section{padding:36px 0; border-top:1px solid var(--line);}
  .guide-section:first-of-type{border-top:none;}
  .guide-section .prose p{color:var(--ink-soft);}
  .callout{background:var(--white); border:1px solid var(--line); border-left:3px solid var(--slate); padding:16px 20px; border-radius:var(--radius); margin:18px 0; max-width:66ch;}
  .callout.warn{border-left-color:var(--rust);}
  .callout p{margin:0; color:var(--ink-soft); font-size:.95rem;}
  .callout strong{color:var(--ink);}

  table.specs{border-collapse:collapse; width:100%; max-width:66ch; margin:18px 0; font-size:.92rem;}
  table.specs th, table.specs td{text-align:left; padding:10px 14px; border-bottom:1px solid var(--line); vertical-align:top;}
  table.specs th{color:var(--ink-soft); font-weight:600; width:42%;}
  table.specs td{font-weight:600;}

  .steps{list-style:none; margin:22px 0; padding:0; max-width:66ch;}
  .steps li{display:flex; gap:16px; padding:16px 0; border-top:1px solid var(--line);}
  .steps li:first-child{border-top:none;}
  .step-num{flex:none; width:30px; height:30px; border-radius:50%; background:var(--slate); color:var(--white); display:flex; align-items:center; justify-content:center; font-weight:600; font-size:.9rem;}
  .steps h3{margin-bottom:.25rem;}
  .steps p{margin:0; color:var(--ink-soft); font-size:.95rem;}

  .products{padding:56px 0; background:var(--paper-2); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
  .products-head{display:flex; justify-content:space-between; align-items:flex-end; gap:20px; flex-wrap:wrap; margin-bottom:8px;}
  .updated{color:var(--ink-soft); font-size:.85rem; white-space:nowrap;}
  .products-note{color:var(--ink-soft); max-width:66ch; margin-bottom:12px;}
  .products-disclosure{color:var(--ink-soft); font-size:.88rem; max-width:66ch; margin-bottom:28px;}
  .product-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px;}
  @media (max-width:760px){.product-grid{grid-template-columns:1fr;}}
  .product-card{background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:26px; display:flex; flex-direction:column;}
  .product-tag{font-size:.8rem; font-weight:600; color:var(--slate); margin-bottom:10px;}
  .product-card h3{font-size:1.3rem; font-family:var(--serif); font-weight:600;}
  .product-sub{font-size:.92rem; color:var(--ink-soft); margin:2px 0 14px;}
  .product-card p.desc{color:var(--ink-soft); font-size:.95rem; flex:1;}
  .product-specs{list-style:none; padding:0; margin:0 0 18px; font-size:.88rem; color:var(--ink-soft);}
  .product-specs li{padding:5px 0; border-top:1px solid var(--line);}
  .product-specs li:first-child{border-top:none;}
  .product-card .btn{text-align:center; margin-top:4px;}
  .ad-label{font-size:.78rem; color:var(--ink-soft); margin:10px 0 0; text-align:center;}

  .faq{padding:56px 0;}
  .faq-list{max-width:70ch;}
  details{border-top:1px solid var(--line); padding:16px 0;}
  details:last-child{border-bottom:1px solid var(--line);}
  summary{cursor:pointer; font-weight:600; font-size:1.02rem; list-style:none; display:flex; justify-content:space-between; gap:16px; align-items:center;}
  summary::-webkit-details-marker{display:none;}
  summary::after{content:"+"; font-size:1.3rem; color:var(--slate); flex:none; font-weight:400;}
  details[open] summary::after{content:"–";}
  details p{margin:12px 0 0; color:var(--ink-soft); max-width:66ch;}

  footer{background:var(--slate-deep); color:#D7DEE0; padding:48px 0 30px; margin-top:20px;}
  footer a{color:#D7DEE0;}
  .foot-grid{display:flex; justify-content:space-between; gap:30px; flex-wrap:wrap; padding-bottom:28px; margin-bottom:8px;}
  .foot-brand{font-family:var(--serif); font-weight:600; font-size:1.15rem; color:#fff;}
  .foot-links{display:flex; gap:24px; flex-wrap:wrap; list-style:none; padding:0; margin:0; font-size:.9rem;}
  .foot-legal{padding:28px 0; border-top:1px solid #2A3944; font-size:.88rem; color:#A9B7BC;}
  .foot-legal h2{color:#fff; font-size:1.1rem; margin:0 0 .8rem; font-family:var(--sans); font-weight:600;}
  .foot-legal h3{color:#fff; font-size:.95rem; margin:1.2rem 0 .3rem;}
  .foot-legal p{color:#A9B7BC; max-width:72ch;}
  .disclosure{font-size:.85rem; color:#A9B7BC; max-width:72ch; border-top:1px solid #2A3944; padding-top:22px;}

  /* ---------- Musterbrief-Seite ---------- */
  .crumbs{font-size:.88rem; color:var(--ink-soft); margin:0 0 14px;}
  .crumbs a{color:var(--ink-soft);}
  .page-head{padding:44px 0 32px; border-bottom:1px solid var(--line);}
  .page-head h1{font-size:clamp(1.9rem,4vw,2.8rem);}
  .page-head .lead{font-size:1.1rem; color:var(--ink-soft); max-width:60ch; margin:0;}
  .howto{padding:40px 0 8px;}
  .letter-section{padding:24px 0 48px;}
  .letter-layout{display:grid; grid-template-columns:340px 1fr; gap:36px; align-items:start;}
  @media (max-width:900px){.letter-layout{grid-template-columns:1fr;}}
  .letter-form{background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:22px; position:sticky; top:calc(84px + env(safe-area-inset-top,0px));}
  @media (max-width:900px){.letter-form{position:static;}}
  .letter-form h2{font-size:1.15rem; font-family:var(--sans); font-weight:600; margin:0 0 .3rem;}
  .letter-form .form-intro{font-size:.88rem; color:var(--ink-soft); margin:0 0 16px;}
  .field{margin:0 0 14px;}
  .field label{display:block; font-size:.85rem; font-weight:600; margin-bottom:4px;}
  .field input{width:100%; font:inherit; font-size:.95rem; padding:9px 11px; border:1px solid var(--line); border-radius:var(--radius); background:var(--paper); color:var(--ink);}
  .field .hint{font-size:.8rem; color:var(--ink-soft); margin:3px 0 0;}
  .privacy-note{font-size:.82rem; color:var(--ink-soft); margin:6px 0 0;}
  .letter-actions{display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin:0 0 16px;}
  button.btn{cursor:pointer; font-family:inherit; line-height:1.2;}
  .btn-small{padding:10px 18px; font-size:.92rem;}
  .copy-status{font-size:.88rem; color:var(--ink-soft);}
  .letter-paper{background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:34px 38px;}
  @media (max-width:600px){.letter-paper{padding:22px 18px;}}
  .letter-text{font-family:var(--serif); font-size:1.02rem; line-height:1.6; white-space:pre-wrap; overflow-wrap:anywhere; margin:0;}
  .letter-text mark{background:rgba(242,169,59,.30); color:inherit; padding:0 2px; border-radius:2px;}
  .after{padding:40px 0 24px; border-top:1px solid var(--line);}
  .after h3{font-size:1.1rem;}
  .after .prose p{color:var(--ink-soft);}
  .after-item{margin:0 0 22px; max-width:66ch;}
  .after-cta{display:flex; gap:12px; flex-wrap:wrap; margin-top:24px;}
  @media print{
    header, footer, .page-head, .howto, .letter-form, .letter-actions, .after, .crumbs{display:none !important;}
    body{background:#fff; color:#000;}
    .letter-section{padding:0;}
    .letter-layout{display:block;}
    .letter-paper{border:none; padding:0; background:#fff;}
    .letter-text{color:#000; font-size:12pt;}
    .letter-text mark{background:none;}
  }

  /* ---------- Themen, Artikel, Rechner ---------- */
  .field select{width:100%; font:inherit; font-size:.95rem; padding:9px 11px; border:1px solid var(--line); border-radius:var(--radius); background:var(--paper); color:var(--ink);}
  .article{padding:36px 0 24px;}
  .article .prose h2{margin-top:2.2rem;}
  .article .prose h2:first-child{margin-top:0;}
  .article .prose p, .article .prose li{color:var(--ink-soft);}
  .article .prose strong{color:var(--ink);}
  .article .prose ul{padding-left:1.2rem; margin:0 0 1rem;}
  .article .prose li{margin:0 0 .4rem;}
  .article .steps{margin:8px 0 26px;}
  .checklist{list-style:none; padding-left:0 !important;}
  .checklist li{padding-left:1.6rem; position:relative;}
  .checklist li::before{content:""; position:absolute; left:0; top:.35em; width:.9rem; height:.9rem; border:2px solid var(--slate); border-radius:3px;}
  .sources{font-size:.88rem; color:var(--ink-soft);}
  .themen{padding:56px 0; background:var(--paper-2); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
  .themen-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:18px; margin-top:22px;}
  .topic{display:block; background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:20px; text-decoration:none; color:var(--ink);}
  .topic:hover{border-color:var(--slate);}
  .topic h3{font-family:var(--serif); font-size:1.15rem; margin:0 0 .3rem; color:var(--ink);}
  .topic p{margin:0; color:var(--ink-soft); font-size:.92rem;}
  .related{padding:40px 0 48px; border-top:1px solid var(--line);}
  .related h2{font-size:1.4rem;}
  .calc-result{background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:26px;}
  .result-grid{display:grid; grid-template-columns:1fr 1fr; gap:22px; margin:0 0 6px;}
  @media (max-width:560px){.result-grid{grid-template-columns:1fr;}}
  .result-item .label{font-size:.85rem; color:var(--ink-soft); margin:0 0 2px;}
  .result-item .value{font-family:var(--serif); font-size:1.8rem; font-weight:600; margin:0; line-height:1.15;}
  .result-item .range{font-size:.85rem; color:var(--ink-soft); margin:3px 0 0;}
  #r-notes .callout{margin:14px 0 0; max-width:none;}
  @media print{.related, .themen{display:none !important;}}