/* xrechnung.dev — one stylesheet for every page. Navy band (nav, hero, API, closing) + white content, one blue accent for actions.
   Fonts are self-hosted (no request to Google: LG München I, 3 O 17493/20). */
@font-face{font-family:"Inter Tight";src:url(/fonts/inter-tight.woff2) format("woff2");font-weight:500 800;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url(/fonts/source-sans-3.woff2) format("woff2");font-weight:400 700;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/plex-mono-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/plex-mono-600.woff2) format("woff2");font-weight:600;font-display:swap}
:root{
  --navy:#0a2342;--navy-line:#24426b;--on-navy:#e8eef7;--on-navy-mut:#b4c2d6;
  --bg:#fff;--tint:#f3f6fa;--fg:#0d1b2e;--mut:#4d5d75;--line:#dbe2eb;
  --acc:#1a62d6;--acc-hover:#1451b3;--acc-ink:#fff;--acc-soft:#e7f0fe;--link:#1a5bc4;
  --ok:#0b7a3b;--ok-soft:#e3f4ea;--bad:#b42318;--bad-soft:#fdecea;--warn:#8a5a00;--warn-soft:#fff4d6;
  --code-bg:#061529;--code-fg:#dbe5f7;--code-mut:#8fa3c2;
  --display:"Inter Tight",-apple-system,"Segoe UI",Roboto,sans-serif;
  --body:"Source Sans 3",-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  color-scheme:light}
@media (prefers-color-scheme:dark){:root{
  --navy:#071a33;--navy-line:#24426b;
  --bg:#0b1626;--tint:#0f1d31;--fg:#e6edf7;--mut:#a7b4c8;--line:#22324a;
  --acc:#4c8dff;--acc-hover:#6aa0ff;--acc-ink:#04122b;--acc-soft:#14284a;--link:#7eb0ff;
  --ok:#4cc97f;--ok-soft:#10301d;--bad:#ff7d6e;--bad-soft:#3a1714;--warn:#f0c060;--warn-soft:#33280f;color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:16px;background:var(--navy)}
body{margin:0;background:var(--bg);color:var(--fg);font:18px/1.6 var(--body)}
a{color:var(--link)}
img{max-width:100%}
:focus-visible{outline:3px solid var(--acc);outline-offset:2px;border-radius:4px}
.wrap{max-width:1160px;margin:0 auto;padding-inline:20px}
h1,h2,h3{font-family:var(--display);text-wrap:balance;letter-spacing:-.02em;color:inherit}
h1{font-size:clamp(34px,5vw,58px);line-height:1.05;font-weight:800;margin:0}
h2{font-size:clamp(26px,3.2vw,38px);line-height:1.15;font-weight:700;margin:0}
h3{font-size:20px;line-height:1.3;font-weight:700;letter-spacing:-.01em;margin:0}
p{margin:0}
.mut,.small{color:var(--mut)}
.small{font-size:14.5px}
.eyebrow{font:600 12.5px/1.2 var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--link)}
code{font:.88em var(--mono);background:var(--tint);border:1px solid var(--line);border-radius:5px;padding:1px 5px;overflow-wrap:anywhere}
pre{margin:0;overflow-x:auto;font:14px/1.65 var(--mono);background:var(--code-bg);color:var(--code-fg);border:1px solid var(--navy-line);border-radius:12px;padding:18px}
pre code{background:none;border:0;padding:0;color:inherit;font-size:inherit;overflow-wrap:normal}
pre .c{color:var(--code-mut)}pre .s{color:#9fd5a7}pre .k{color:#9cc0ff}
.skip{position:absolute;left:-999px;top:8px;background:var(--bg);color:var(--fg);padding:8px 12px;z-index:20}.skip:focus{left:8px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:700 17px/1.2 var(--body);padding:14px 22px;border-radius:10px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background .15s,border-color .15s;background:var(--acc);color:var(--acc-ink)}
.btn:hover{background:var(--acc-hover)}
.btn.sec{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.sec:hover{border-color:var(--fg)}
.on-navy .btn.sec,.navy .btn.sec{color:#fff;border-color:var(--navy-line)}
.on-navy .btn.sec:hover,.navy .btn.sec:hover{border-color:#fff}
.btns{display:flex;flex-wrap:wrap;gap:12px}

/* nav */
.navband{background:var(--navy);color:var(--on-navy)}
nav.top{display:flex;align-items:center;gap:24px;padding-block:16px;font-size:16px}
nav.top .brand{font:800 21px var(--display);color:#fff;text-decoration:none;margin-right:auto;display:flex;align-items:center;gap:10px;letter-spacing:-.02em}
nav.top .brand i{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:7px;background:#1a62d6;color:#fff;font:600 12px var(--mono);font-style:normal}
nav.top a{color:var(--on-navy-mut);text-decoration:none}
nav.top a:hover,nav.top a[aria-current]{color:#fff}
nav.top .cta{background:#fff;color:var(--navy);padding:9px 16px;border-radius:9px;font-weight:700}
nav.top .cta:hover{color:var(--navy);background:#e8eef7}

/* hero */
.hero{background:var(--navy);color:var(--on-navy);padding-block:40px 76px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 500px at 85% 10%,rgba(26,98,214,.38),transparent 60%),radial-gradient(600px 400px at 0% 100%,rgba(26,98,214,.18),transparent 60%);pointer-events:none}
.hero>.wrap{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.hero>.wrap>*{min-width:0}
.hero h1{color:#fff;margin-top:14px}
.hero .eyebrow{color:#8fb8ff}
.hero .lead{font-size:21px;color:var(--on-navy-mut);margin-top:20px;max-width:38ch}
.tool{margin-top:30px;background:var(--bg);color:var(--fg);border-radius:16px;padding:22px;display:grid;gap:14px;box-shadow:0 30px 60px -30px rgba(0,0,0,.6)}
.drop{border:2px dashed color-mix(in srgb,var(--acc) 50%,var(--line));border-radius:12px;padding:24px;display:grid;gap:6px;text-align:center;cursor:pointer;transition:background .15s,border-color .15s;background:var(--bg)}
.drop:hover,.drop.over{border-color:var(--acc);background:var(--acc-soft)}
.drop strong{font:700 20px var(--display)}
.tool .row{display:flex;flex-wrap:wrap;gap:10px}.tool .row .btn{flex:1 1 auto}
.tool .note{font-size:14.5px;color:var(--mut);text-align:center}
.trust{display:flex;flex-wrap:wrap;gap:10px 22px;margin:22px 0 0;font-size:16px;padding:0;list-style:none}
.trust li{display:flex;gap:8px;align-items:center}
.trust li::before{content:"";width:16px;height:16px;flex:none;background:#5fd38d;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3 3 7-7' fill='none' stroke='black' stroke-width='2.2'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3 3 7-7' fill='none' stroke='black' stroke-width='2.2'/%3E%3C/svg%3E") center/contain no-repeat}
.bg-light .trust li::before,article .trust li::before{background:var(--ok)}

/* validator result (rendered by validator.js) */
.res{display:none;text-align:left;min-width:0}
.tool>*{min-width:0}
.res>*+*{margin-top:10px}
.badge{display:inline-block;padding:5px 12px;border-radius:999px;font:700 15px var(--body)}
.badge.ok{background:var(--ok-soft);color:var(--ok)}
.badge.bad{background:var(--bad-soft);color:var(--bad)}
.find{padding:10px 12px;border-left:3px solid var(--bad);background:var(--bad-soft);border-radius:0 8px 8px 0;font-size:15.5px;overflow-wrap:anywhere}
.find.warn{border-color:var(--warn);background:var(--warn-soft)}
.find code{display:inline-block;margin-top:4px;font-size:12.5px}
.res .tbl{overflow-x:auto}
.res table{font-size:15px}
.res textarea{width:100%;margin-top:8px;font:14px/1.5 var(--body);color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px}
.res details summary{cursor:pointer;font-weight:700}

/* sample report (hero visual) */
.report{background:var(--bg);color:var(--fg);border-radius:14px;overflow:hidden;box-shadow:0 40px 80px -40px rgba(0,0,0,.7);border:1px solid rgba(255,255,255,.08)}
.report header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);background:var(--tint)}
.report .file{font:500 14px var(--mono);overflow-wrap:anywhere}
.pill{display:inline-flex;align-items:center;gap:6px;font:700 13.5px var(--body);padding:5px 11px;border-radius:999px;white-space:nowrap}
.pill.bad{background:var(--bad-soft);color:var(--bad)}
.report .body{padding:18px 20px;display:grid;gap:16px}
.report .find{display:grid;gap:3px}
.report .code{font:600 13px var(--mono);color:var(--bad)}
.kv{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px;font-size:15.5px;margin:0}
.kv dt{color:var(--mut)}.kv dd{margin:0;font-variant-numeric:tabular-nums;min-width:0}
.report footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:12px 20px;border-top:1px solid var(--line);font:12.5px var(--mono);color:var(--mut)}
.cap{margin-top:12px;font-size:15px;color:var(--on-navy-mut)}

/* facts strip */
.facts{border-bottom:1px solid var(--line)}
.facts .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;padding-block:28px}
.facts div{display:grid;gap:2px;min-width:0}
.facts b{font:800 26px var(--display);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.facts span{color:var(--mut);font-size:15.5px}
.formats{display:flex;flex-wrap:wrap;gap:10px 28px;align-items:center;justify-content:center;padding-block:22px;font:600 15px var(--mono);color:var(--mut);border-bottom:1px solid var(--line)}
.formats span:first-child{font:400 15px var(--body)}

/* sections */
section.band{padding-block:88px}
section.tint{background:var(--tint)}
section.navy{background:var(--navy);color:var(--on-navy)}
section.navy h2{color:#fff}
.head{display:grid;gap:12px;max-width:700px;margin-bottom:40px}
.head.c{margin-inline:auto;text-align:center}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;list-style:none;padding:0;margin:0;counter-reset:s}
.steps li{display:grid;gap:8px;align-content:start;background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:26px}
.steps li::before{counter-increment:s;content:counter(s);font:600 16px var(--mono);width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:var(--navy);color:#fff;margin-bottom:8px}
.aud{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.aud article{border-top:3px solid var(--fg);padding-top:20px;display:grid;gap:10px;align-content:start}
.aud a{font-weight:700;text-decoration:none}.aud a:hover{text-decoration:underline}
.time{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.time div{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:24px;display:grid;gap:6px;align-content:start}
.time div.now{background:var(--navy);border-color:var(--navy);color:var(--on-navy)}
.time div.now p{color:var(--on-navy-mut)}
.time b{font:800 34px var(--display);letter-spacing:-.02em}
.time small{font:600 12px var(--mono);letter-spacing:.06em;text-transform:uppercase}
.dev{display:grid;grid-template-columns:.85fr 1.15fr;gap:48px;align-items:center}
.dev>*{min-width:0}
.dev p{color:var(--on-navy-mut);margin-top:14px}
.dev ul{margin:20px 0 28px;padding:0;list-style:none;display:grid;gap:8px;font:15px var(--mono)}
.dev .eyebrow{color:#8fb8ff}

/* pricing */
.toggle{display:inline-flex;align-items:center;gap:4px;background:var(--tint);border:1px solid var(--line);border-radius:999px;padding:4px;margin-bottom:34px}
.toggle button{font:700 15px var(--body);border:0;background:transparent;color:var(--mut);padding:9px 18px;border-radius:999px;cursor:pointer}
.toggle button[aria-pressed="true"]{background:var(--navy);color:#fff}
.plans{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;align-items:stretch}
.plan{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:26px 22px;display:flex;flex-direction:column;gap:12px;position:relative;min-width:0}
.plan.hl{border:2px solid var(--acc);box-shadow:0 24px 50px -30px var(--acc)}
.plan .tag{position:absolute;top:-13px;left:22px;font:700 13px var(--body);background:var(--acc);color:var(--acc-ink);padding:4px 12px;border-radius:999px}
.plan .for{font-size:16px;color:var(--mut);min-height:3.2em}
.plan .price{font:800 44px/1 var(--display);letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.plan .price small{font:400 15px var(--body);color:var(--mut);letter-spacing:0}
.plan .per{font-size:15px;color:var(--mut)}
.plan .vol{font:600 15px var(--mono)}
.plan ul{margin:0;padding:0;list-style:none;font-size:16.5px;display:grid;gap:7px;flex:1;align-content:start}
.plan li{display:flex;gap:8px}
.plan li::before{content:"✓";color:var(--ok);font-weight:700}
.free{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-top:20px}
.assure{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 28px;margin:26px 0 0;font-size:16.5px;color:var(--mut);list-style:none;padding:0}
.assure li::before{content:"✓ ";color:var(--ok);font-weight:700}
.calc{margin-top:44px;background:var(--tint);border-radius:16px;padding:28px;display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}
.calc>*{min-width:0}
.calc label{font:700 19px var(--display);display:block;margin-bottom:14px}
.calc input[type=range]{width:100%;accent-color:var(--acc);height:28px}
.calc output{display:block;font:800 36px var(--display);font-variant-numeric:tabular-nums}
.calc .out{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:20px;display:grid;gap:6px}
.calc .out b{font:800 24px var(--display)}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:14px}
table{width:100%;border-collapse:collapse;font-size:16px}
th,td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
tr:last-child>td,tr:last-child>th{border-bottom:0}
th{font-weight:700;color:var(--mut)}
.cmp{margin-top:44px}
.cmp table{min-width:720px}
.cmp td,.cmp th{text-align:center}
.cmp td:first-child,.cmp th:first-child{text-align:left}
.cmp thead th{font:700 16px var(--display);background:var(--tint);color:var(--fg)}
.cmp thead th.hl{background:var(--acc);color:var(--acc-ink)}
.cmp td.hl{background:var(--acc-soft)}
.y{color:var(--ok);font-weight:700}

/* faq */
.faqgrid{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px}
.faqgrid>*{min-width:0}
details.q{border-bottom:1px solid var(--line);padding-block:18px}
details.q summary{cursor:pointer;font:700 19px/1.35 var(--display);list-style:none;display:flex;justify-content:space-between;gap:16px}
details.q summary::-webkit-details-marker{display:none}
details.q summary::after{content:"+";font:400 24px/1 var(--mono);color:var(--link)}
details.q[open] summary::after{content:"–"}
details.q p{margin-top:10px;color:var(--mut);max-width:65ch}
.final{text-align:center}
.final p{color:var(--on-navy-mut);margin-top:12px}
.final .btns{justify-content:center;margin-top:28px}

/* article pages (Ratgeber, Fehlercodes, legal) */
.pagehead{background:var(--navy);color:var(--on-navy);padding-block:36px 44px}
.pagehead h1{color:#fff;font-size:clamp(30px,4.2vw,46px);max-width:24ch;margin-top:12px}
.pagehead .eyebrow{color:#8fb8ff}
.pagehead .crumbs{font-size:15px;color:var(--on-navy-mut);margin-top:14px}
.pagehead .crumbs a{color:var(--on-navy-mut)}
article.doc{max-width:760px;padding-block:44px 24px;overflow-wrap:break-word;hyphens:auto}
.pagehead h1,h1,h2{overflow-wrap:break-word;hyphens:auto}
article.doc>*+*{margin-top:16px}
article.doc h2{font-size:28px;margin-top:44px}
article.doc h3{margin-top:28px}
article.doc ul,article.doc ol{padding-left:22px}
article.doc li+li{margin-top:6px}
article.doc table{font-size:16px}
article.doc>table{border:1px solid var(--line)}
@media (max-width:760px){article.doc table{display:block;overflow-x:auto}}
.box{background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:24px;display:grid;gap:12px}
.box .btns{margin-top:4px}
.tag{display:inline-block;background:var(--acc-soft);color:var(--link);font:600 12.5px var(--mono);letter-spacing:.04em;padding:4px 10px;border-radius:999px}
article.doc #validator .tool{margin-top:0;box-shadow:none;border:1px solid var(--line)}

ul.guides{list-style:none;padding:0}ul.guides li{padding-block:12px;border-bottom:1px solid var(--line)}ul.guides a{font-weight:700;text-decoration:none}ul.guides a:hover{text-decoration:underline}

.account .card{background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:24px;display:grid;gap:12px}
.account .card .btn{justify-self:start}
.account button{font:700 16px var(--body);background:var(--acc);color:var(--acc-ink);border:0;border-radius:10px;padding:12px 18px;cursor:pointer}
.account button.sec{background:transparent;color:var(--fg);border:1.5px solid var(--line)}
.account form{display:inline}
.account table{display:block;overflow-x:auto}

article.doc .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:16px}
article.doc .card{background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:20px;display:grid;gap:8px;align-content:start;min-width:0}
article.doc .card h3{margin:0}
article.doc>.btn{margin-right:10px}

/* footer */
footer.site{background:var(--navy);color:var(--on-navy-mut);font-size:15.5px;margin-top:0}
footer.site .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;padding-block:48px}
footer.site b{color:#fff;font-family:var(--display);display:block;margin-bottom:10px}
footer.site a{color:var(--on-navy-mut);text-decoration:none;display:block;margin:5px 0}
footer.site a:hover{color:#fff}
footer.site .legal{grid-column:1/-1;border-top:1px solid var(--navy-line);padding-top:20px;font-size:14px}
fieldset.q{border:0;padding:0;margin:0 0 14px}fieldset.q legend{font-weight:700;margin-bottom:6px}fieldset.q label{display:inline-flex;gap:6px;align-items:center;margin-right:22px;min-height:32px}
.nl{display:grid;gap:8px;max-width:560px}.nl .nlrow{display:flex;gap:8px;flex-wrap:wrap}.nl input[type=email]{flex:1 1 220px;min-width:0;font:16px var(--body);padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg)}.nl button{font:700 16px var(--body);background:var(--acc);color:var(--acc-ink);border:0;border-radius:10px;padding:11px 18px;cursor:pointer}.nl label{display:flex;gap:8px;align-items:flex-start}.nl .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}footer.site .nl{grid-column:1/-1}footer.site .nl .small{color:var(--on-navy-mut)}footer.site .nl a{display:inline;margin:0;text-decoration:underline}.res .nl{margin-top:18px;padding-top:14px;border-top:1px solid var(--line)}
.sticky{display:none}
.sticky.away{transform:translateY(110%)}.sticky{transition:transform .2s}

/* phone menu: the links stay reachable without JS */
nav.top .menu{display:none;position:relative}
nav.top .menu summary{list-style:none;cursor:pointer;color:#fff;font-weight:700;padding:8px 4px}
nav.top .menu summary::-webkit-details-marker{display:none}
nav.top .menu[open] div{position:absolute;right:0;top:44px;background:var(--navy);border:1px solid var(--navy-line);border-radius:12px;padding:10px 16px;display:grid;gap:4px;min-width:200px;z-index:10;box-shadow:0 20px 40px -20px rgba(0,0,0,.6)}
nav.top .menu[open] div a{display:block;padding:6px 0}
@media (max-width:960px){
  .hero>.wrap,.dev,.faqgrid,.calc{grid-template-columns:1fr}
  .plans{grid-template-columns:repeat(2,minmax(0,1fr))}
  .aud,.steps,.time{grid-template-columns:1fr}
  .facts .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}
  footer.site .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}
  nav.top{gap:18px}
}
@media (max-width:720px){
  nav.top>a:not(.brand):not(.cta){display:none}
  nav.top .menu{display:inline-flex}
}
@media (max-width:600px){
  body{font-size:17px}
  nav.top{gap:12px}
  nav.top .brand{font-size:18px;gap:8px}
  nav.top .brand i{width:26px;height:26px}
  nav.top .cta{padding:8px 12px;font-size:15px;white-space:nowrap}
  nav.top .menu summary{font-size:20px;padding:6px 2px}
  nav.top .menu .mt{display:none}
  .hero{padding-block:22px 56px}
  .tool{padding:16px}
  .plans{grid-template-columns:1fr}
  .plan .for{min-height:0}
  section.band{padding-block:60px}
  .calc{padding:20px}
  .sticky{display:flex;position:fixed;left:0;right:0;bottom:0;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));background:var(--bg);border-top:1px solid var(--line);z-index:9}
  .sticky .btn{flex:1}
  body.has-sticky{padding-bottom:76px}
  footer.site .wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:360px){nav.top{gap:10px}nav.top .brand i{display:none}nav.top .cta{padding:7px 10px;font-size:14px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{html,body{background:#fff}.navband,.hero::before,footer.site,.sticky,.nl,.noprint{display:none}
.sticky.away{transform:translateY(110%)}.sticky{transition:transform .2s}}