/* ============================================================
   xrechnung-integration.de — Design System
   Palette:  Tinte #102A43 · Papier #FAFBFC · Linie #D9E2EC
             Valid-Grün #0E9F6E · Frist-Amber #B45309 · Akzent #1B5E9E
   Type:     Archivo (Display) · Inter (Body) · IBM Plex Mono (Daten)
   ============================================================ */

:root{
  --ink:#102A43;
  --ink-soft:#334E68;
  --paper:#FAFBFC;
  --line:#D9E2EC;
  --line-soft:#EDF2F7;
  --valid:#0E9F6E;
  --valid-bg:#E6F7F0;
  --amber:#B45309;
  --amber-bg:#FDF3E7;
  --blue:#1B5E9E;
  --blue-bg:#EAF2FA;
  --white:#FFFFFF;
  --display:'Archivo',system-ui,sans-serif;
  --body:'Inter',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --radius:6px;
  --maxw:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:1.0625rem;
  -webkit-font-smoothing:antialiased;
}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono);font-size:.85em;letter-spacing:-.01em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.skip-link{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 16px;z-index:100}
.skip-link:focus{left:0}

h1,h2,h3{font-family:var(--display);line-height:1.15;letter-spacing:-.02em}
h1{font-size:clamp(2rem,4.5vw,3.25rem);font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2.125rem);font-weight:700}
h3{font-size:1.25rem;font-weight:700}
p{max-width:68ch}
a{color:var(--blue)}
a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:2px}

/* ---------- Topbar (Frist) ---------- */
.topbar{background:var(--ink);color:#fff;font-size:.8rem;padding:7px 0}
.topbar-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.topbar .mono{color:#BCCCDC}
.topbar-deadline{color:#FBC88D !important;font-weight:500}

/* ---------- Header ---------- */
.site-header{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-mark{background:var(--ink);color:#7BE3B8;padding:5px 8px;border-radius:var(--radius);font-weight:500;font-size:.95rem}
.brand-name{font-family:var(--display);font-weight:600;font-size:1.05rem;letter-spacing:-.01em}
.brand-name strong{font-weight:800}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a{color:var(--ink-soft);text-decoration:none;font-weight:500;font-size:.95rem}
.main-nav a:hover{color:var(--ink)}
.main-nav a[aria-current="page"]{color:var(--ink);border-bottom:2px solid var(--valid)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0}

/* ---------- Buttons ---------- */
.btn{display:inline-block;font-family:var(--body);font-weight:600;font-size:.95rem;
  padding:13px 26px;border-radius:var(--radius);text-decoration:none;border:1px solid transparent;
  cursor:pointer;transition:background .15s,color .15s}
.btn-primary{background:var(--valid);color:#fff}
.btn-primary:hover{background:#0B845B}
.btn-secondary{background:var(--white);color:var(--ink);border-color:var(--line)}
.btn-secondary:hover{border-color:var(--ink-soft)}
.btn-nav{padding:10px 18px}

/* ---------- Hero ---------- */
.hero{padding:72px 0 64px;background:linear-gradient(180deg,var(--white) 0%,var(--paper) 100%);border-bottom:1px solid var(--line-soft)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.eyebrow{font-family:var(--mono);font-size:.8rem;color:var(--amber);background:var(--amber-bg);
  display:inline-block;padding:5px 12px;border-radius:99px;margin-bottom:20px;font-weight:500}
.hero h1{margin-bottom:20px}
.hero h1 em{font-style:normal;color:var(--valid)}
.hero-sub{font-size:1.15rem;color:var(--ink-soft);margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:28px}
.hero-trust{display:flex;gap:22px;flex-wrap:wrap;font-size:.85rem;color:var(--ink-soft)}
.hero-trust span::before{content:"✓ ";color:var(--valid);font-weight:700}

/* Signature: XML-Karte */
.xml-card{background:var(--ink);border-radius:10px;padding:0;overflow:hidden;
  box-shadow:0 24px 60px -24px rgba(16,42,67,.45)}
.xml-card-head{display:flex;align-items:center;justify-content:space-between;
  padding:12px 18px;border-bottom:1px solid #243B53}
.xml-card-head .mono{color:#829AB1;font-size:.75rem}
.badge-valid{font-family:var(--mono);font-size:.75rem;color:#7BE3B8;background:rgba(14,159,110,.18);
  border:1px solid rgba(123,227,184,.4);padding:4px 10px;border-radius:99px}
.xml-card pre{padding:20px 18px;font-family:var(--mono);font-size:.8rem;line-height:1.7;
  color:#D9E2EC;overflow-x:auto}
.xml-card .tag{color:#7BE3B8}
.xml-card .val{color:#FBC88D}
.xml-card-foot{padding:12px 18px;border-top:1px solid #243B53;font-family:var(--mono);
  font-size:.72rem;color:#829AB1}

/* ---------- Sections ---------- */
.section{padding:80px 0}
.section-alt{background:var(--white);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.section-head{margin-bottom:48px;max-width:720px}
.section-head .eyebrow{color:var(--blue);background:var(--blue-bg)}
.section-head p{color:var(--ink-soft);margin-top:14px;font-size:1.1rem}

/* ---------- Karten / Grids ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:32px}
.card h3{margin-bottom:12px}
.card p{font-size:.97rem;color:var(--ink-soft)}
.card .mono-label{font-family:var(--mono);font-size:.75rem;color:var(--valid);
  text-transform:uppercase;letter-spacing:.06em;display:block;margin-bottom:14px}

/* Offre / Preise */
.price-card{display:flex;flex-direction:column}
.price-card .price{font-family:var(--display);font-size:2rem;font-weight:800;margin:14px 0 4px}
.price-card .price small{font-size:.9rem;font-weight:500;color:var(--ink-soft)}
.price-card ul{list-style:none;margin:20px 0 28px;flex:1}
.price-card li{padding:7px 0;font-size:.95rem;color:var(--ink-soft);border-bottom:1px solid var(--line-soft)}
.price-card li::before{content:"✓";color:var(--valid);font-weight:700;margin-right:10px}
.price-card.featured{border-color:var(--valid);box-shadow:0 16px 40px -20px rgba(14,159,110,.35)}
.price-card .hint{font-size:.8rem;color:var(--ink-soft);margin-top:14px}

/* Prozess */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:26px 22px;background:var(--white);border:1px solid var(--line);border-radius:10px}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);
  font-family:var(--mono);font-size:.8rem;color:var(--valid);font-weight:500;display:block;margin-bottom:12px}
.step h3{font-size:1.05rem;margin-bottom:8px}
.step p{font-size:.9rem;color:var(--ink-soft)}

/* Regionen */
.region-card{border-left:4px solid var(--blue)}
.region-card .mono-label{color:var(--blue)}
.region-card.region-pflicht{border-left-color:var(--amber)}
.region-card.region-pflicht .mono-label{color:var(--amber)}
.pill{display:inline-block;font-family:var(--mono);font-size:.72rem;padding:3px 10px;
  border-radius:99px;margin-top:12px}
.pill-amber{background:var(--amber-bg);color:var(--amber)}
.pill-blue{background:var(--blue-bg);color:var(--blue)}
.pill-green{background:var(--valid-bg);color:var(--valid)}

/* Timeline Fristen */
.timeline{border-left:2px solid var(--line);margin-left:8px;padding-left:32px;display:grid;gap:28px}
.tl-item{position:relative}
.tl-item::before{content:"";position:absolute;left:-39px;top:6px;width:12px;height:12px;
  border-radius:50%;background:var(--white);border:3px solid var(--valid)}
.tl-item.tl-past::before{background:var(--valid)}
.tl-item.tl-amber::before{border-color:var(--amber)}
.tl-date{font-family:var(--mono);font-size:.85rem;color:var(--valid);font-weight:500}
.tl-item.tl-amber .tl-date{color:var(--amber)}
.tl-item h3{font-size:1.05rem;margin:4px 0}
.tl-item p{font-size:.95rem;color:var(--ink-soft)}

/* Ratgeber */
.article-card{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--ink)}
.article-card:hover h3{color:var(--blue)}
.article-card .mono-label{color:var(--blue)}
.article-card .read{font-size:.85rem;color:var(--blue);font-weight:600;margin-top:auto}

/* CTA-Band */
.cta-band{background:var(--ink);color:#fff;border-radius:14px;padding:56px;
  display:flex;justify-content:space-between;align-items:center;gap:40px;flex-wrap:wrap}
.cta-band h2{color:#fff;max-width:560px}
.cta-band p{color:#BCCCDC;margin-top:10px}

/* ---------- Formular ---------- */
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:760px}
.form-field{display:flex;flex-direction:column;gap:7px}
.form-field.full{grid-column:1/-1}
label{font-weight:600;font-size:.92rem}
input,select,textarea{font-family:var(--body);font-size:1rem;padding:12px 14px;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--white);color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:3px solid var(--blue-bg);border-color:var(--blue)}
.form-note{font-size:.85rem;color:var(--ink-soft)}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#BCCCDC;margin-top:80px;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr .8fr;gap:40px;padding-bottom:48px}
.footer-brand{color:#fff;margin-bottom:14px}
.footer-text{font-size:.9rem}
.footer-regions{margin-top:16px;color:#829AB1;font-size:.78rem}
.footer-heading{font-family:var(--display);font-weight:700;color:#fff;margin-bottom:14px;font-size:.95rem}
.site-footer nav a{display:block;color:#BCCCDC;text-decoration:none;font-size:.9rem;padding:5px 0}
.site-footer nav a:hover{color:#fff}
.footer-bottom{border-top:1px solid #243B53;padding:20px 24px;display:flex;
  justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.8rem;color:#829AB1}

/* ---------- Responsive ---------- */
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .grid-3,.steps{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .grid-3,.grid-2,.steps,.form-grid,.footer-grid{grid-template-columns:1fr}
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--white);
    flex-direction:column;align-items:flex-start;padding:20px 24px;gap:18px;
    border-bottom:1px solid var(--line)}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .cta-band{padding:36px 28px}
  .section{padding:56px 0}
}