/* ===========================================================
   e-rechnung.guru – Designsystem
   Modern & vertrauenswürdig (Blau/Grün)
   =========================================================== */

:root {
  --blue-900: #0B2E54;
  --blue-700: #0F3D6E;
  --blue-500: #1B5FA8;
  --blue-100: #E7F0FA;
  --green-600: #0E9F6E;
  --green-500: #10B981;
  --green-100: #E6F7F0;
  --ink: #16202E;
  --slate: #4A5A6E;
  --muted: #6B7A8D;
  --line: #E3E9F0;
  --bg: #FFFFFF;
  --bg-soft: #F5F8FC;
  --white: #FFFFFF;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(15, 61, 110, 0.06), 0 6px 16px rgba(15, 61, 110, 0.05);
  --shadow-md: 0 8px 30px rgba(15, 61, 110, 0.10);
  --maxw: 1140px;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--blue-500); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; color: var(--blue-900); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4vw, 3.1rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.2rem; }
p { color: var(--slate); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
.section-soft { background: var(--bg-soft); }
.eyebrow {
  display: inline-block; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--green-600); margin-bottom: 14px;
}
.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.section-head p { font-size: 1.08rem; margin-top: 14px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font-weight: 600; font-size: 1rem; border-radius: var(--radius-sm);
  padding: 13px 24px; border: 1px solid transparent; transition: all .18s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--green-500); color: #fff; box-shadow: 0 6px 18px rgba(16,185,129,.30); }
.btn-primary:hover { background: var(--green-600); }
.btn-secondary { background: var(--white); color: var(--blue-700); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn-secondary:hover { border-color: var(--blue-500); color: var(--blue-500); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.12); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.nav-logo img { height: 38px; }
.nav-links { display: flex; align-items: center; gap: 30px; list-style: none; }
.nav-links a { color: var(--slate); font-weight: 500; font-size: .97rem; }
.nav-links a:hover { color: var(--blue-700); text-decoration: none; }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, #0F3D6E 0%, #0B2E54 55%, #0B2E54 100%);
  color: #fff; padding: 92px 0 100px;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(16,185,129,.28), transparent 70%); pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; position: relative; z-index: 1; }
.hero h1 { color: #fff; }
.hero .lead { color: #D5E3F2; font-size: 1.18rem; margin: 20px 0 30px; max-width: 540px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px; background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18); padding: 7px 15px; border-radius: 100px;
  font-size: .88rem; color: #E6F0FA; margin-bottom: 22px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-500); box-shadow: 0 0 0 4px rgba(16,185,129,.25); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-trust { margin-top: 30px; color: #AFC3DA; font-size: .9rem; display: flex; gap: 22px; flex-wrap: wrap; }
.hero-trust span { display: inline-flex; align-items: center; gap: 7px; }

/* Hero mockup card */
.hero-card {
  background: #fff; border-radius: 20px; box-shadow: 0 30px 70px rgba(0,0,0,.32);
  padding: 22px; color: var(--ink);
}
.hero-card .mail-row {
  display: flex; align-items: center; gap: 12px; padding: 13px 14px; border: 1px solid var(--line);
  border-radius: 12px; margin-bottom: 12px; background: var(--bg-soft);
}
.hero-card .mail-row .ic { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; flex-shrink: 0; color: #fff; font-weight: 700; }
.hero-card .mail-row small { color: var(--muted); display: block; font-size: .8rem; }
.hero-card .mail-row strong { font-size: .95rem; color: var(--ink); }
.flow-arrow { text-align: center; color: var(--green-500); font-size: 1.3rem; line-height: 1; margin: -4px 0 8px; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.step {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 26px; box-shadow: var(--shadow-sm); position: relative;
}
.step-num {
  width: 44px; height: 44px; border-radius: 12px; background: var(--blue-100); color: var(--blue-700);
  font-weight: 700; font-size: 1.1rem; display: grid; place-items: center; margin-bottom: 18px;
}
.step h3 { margin-bottom: 8px; }
.step p { font-size: .98rem; }

/* ---------- Features ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feature {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; box-shadow: var(--shadow-sm); transition: transform .18s, box-shadow .18s;
}
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.feature .ic {
  width: 48px; height: 48px; border-radius: 12px; background: var(--green-100); color: var(--green-600);
  display: grid; place-items: center; margin-bottom: 16px;
}
.feature h3 { margin-bottom: 8px; }
.feature p { font-size: .96rem; }

/* ---------- Audience ---------- */
.audience-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.audience-card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px;
  background: var(--white); box-shadow: var(--shadow-sm);
}
.audience-card ul { list-style: none; margin-top: 16px; }
.audience-card li { display: flex; gap: 10px; padding: 7px 0; color: var(--slate); font-size: .98rem; }
.audience-card li svg { flex-shrink: 0; color: var(--green-500); margin-top: 4px; }

/* ---------- Pricing ---------- */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: stretch; }
.price-card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 28px;
  background: var(--white); box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
}
.price-card.featured { border: 2px solid var(--green-500); box-shadow: var(--shadow-md); position: relative; }
.price-card.featured .tag {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--green-500); color: #fff; font-size: .78rem; font-weight: 700;
  padding: 5px 14px; border-radius: 100px; letter-spacing: .03em;
}
.price-card h3 { font-size: 1.25rem; }
.price-card .price { font-size: 2.4rem; font-weight: 800; color: var(--blue-900); margin: 14px 0 4px; }
.price-card .price small { font-size: .95rem; font-weight: 500; color: var(--muted); }
.price-card .price-sub { color: var(--muted); font-size: .9rem; margin-bottom: 20px; }
.price-card ul { list-style: none; margin-bottom: 26px; flex-grow: 1; }
.price-card li { display: flex; gap: 10px; padding: 8px 0; font-size: .96rem; color: var(--slate); border-top: 1px solid var(--line); }
.price-card li:first-child { border-top: none; }
.price-card li svg { color: var(--green-500); flex-shrink: 0; margin-top: 4px; }
.price-note { text-align: center; color: var(--muted); font-size: .9rem; margin-top: 22px; }

/* ---------- Partners ---------- */
.partners { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.partner-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow-sm);
}
.partner-card h3 { color: var(--blue-700); margin-bottom: 6px; }
.partner-card .role { color: var(--green-600); font-weight: 600; font-size: .9rem; margin-bottom: 12px; }

/* ---------- FAQ ---------- */
.faq { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; background: var(--white); overflow: hidden; }
.faq-item summary {
  cursor: pointer; padding: 20px 24px; font-weight: 600; color: var(--blue-900);
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.5rem; color: var(--green-500); font-weight: 400; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 24px 22px; font-size: .98rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, #0F3D6E, #1B5FA8); color: #fff; border-radius: 24px;
  padding: 56px; text-align: center; position: relative; overflow: hidden;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: #D5E3F2; max-width: 560px; margin: 14px auto 28px; font-size: 1.08rem; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info p { margin-bottom: 8px; }
.contact-info .label { font-weight: 600; color: var(--blue-900); }
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; color: var(--blue-900); }
.form-field input, .form-field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 1rem; color: var(--ink); background: var(--white);
}
.form-field input:focus, .form-field textarea:focus { outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px var(--blue-100); }
.form-check { display: flex; gap: 10px; align-items: flex-start; font-size: .88rem; color: var(--muted); margin-bottom: 18px; }
.form-check input { margin-top: 4px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--blue-900); color: #C7D6E6; padding: 60px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 40px; }
.site-footer h4 { color: #fff; font-size: .95rem; margin-bottom: 14px; letter-spacing: .02em; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { color: #C7D6E6; font-size: .93rem; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.footer-logo { background: #fff; padding: 10px 14px; border-radius: 10px; display: inline-block; margin-bottom: 14px; }
.footer-logo img { height: 32px; }
.footer-about { font-size: .92rem; color: #9DB4CC; max-width: 280px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding-top: 22px; display: flex;
  justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: .86rem; color: #9DB4CC;
}

/* ---------- Legal pages ---------- */
.legal { padding: 60px 0 80px; }
.legal .container { max-width: 820px; }
.legal h1 { margin-bottom: 8px; }
.legal h2 { font-size: 1.4rem; margin: 36px 0 12px; }
.legal h3 { margin: 22px 0 8px; }
.legal p, .legal li { color: var(--slate); margin-bottom: 12px; font-size: .98rem; }
.legal ul { margin: 0 0 12px 22px; }
.legal .back { display: inline-block; margin-bottom: 28px; font-weight: 600; }
.legal .placeholder { background: var(--green-100); border-left: 3px solid var(--green-500); padding: 2px 8px; border-radius: 4px; color: var(--blue-900); font-weight: 500; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-card { max-width: 460px; }
  .steps, .features, .pricing, .partners, .audience-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; position: absolute; top: 76px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 18px 24px; border-bottom: 1px solid var(--line); gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 10px 0; }
  .nav-toggle { display: block; }
  .cta-band { padding: 40px 24px; }
}
@media (max-width: 560px) {
  .section { padding: 60px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-cta .btn-secondary { display: none; }
}