@font-face {
  font-family: "Acid";
  src: url("../fonts/acid.woff2") format("woff2");
  font-display: swap;
  font-style: normal;
  font-weight: 400;
}

:root {
  --anthrazit: #2E3133;
  --petrol: #5B7F78;
  --graugruen: #A7B3AF;
  --softgrau: #E6EAEC;
  --offwhite: #F7F7F5;
  --weiss: #FFFFFF;
  --text: #24292B;
  --muted: #606A6B;
  --line: rgba(46, 49, 51, .16);
  --shadow: 0 18px 50px rgba(46, 49, 51, .10);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--offwhite);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.skip-link {
  position: absolute; left: -9999px; top: auto;
}
.skip-link:focus {
  left: 1rem; top: 1rem; z-index: 999;
  background: var(--weiss); padding: .75rem 1rem;
}

.container { width: min(calc(100% - 3rem), var(--max)); margin-inline: auto; }
.eyebrow {
  margin: 0 0 .65rem;
  color: var(--petrol);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}
h1, h2, h3, .brand-name {
  font-family: "Acid", Inter, sans-serif;
  font-weight: 400;
  line-height: 1.07;
}
h1 { font-size: clamp(3rem, 6.5vw, 6.5rem); letter-spacing: -.025em; margin: 0; }
h2 { font-size: clamp(2rem, 3.5vw, 3.4rem); margin: 0 0 1.5rem; }
h3 { font-size: 1.35rem; margin: 0 0 .7rem; }
p { margin: 0 0 1rem; }
.lead { font-size: clamp(1.05rem, 1.45vw, 1.27rem); color: var(--muted); max-width: 39rem; }
.rule { width: 4rem; height: 3px; background: var(--petrol); margin: 1.8rem 0; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247, 247, 245, .92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.header-inner {
  min-height: 92px;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}
.brand { display: inline-flex; align-items: center; gap: .95rem; text-decoration: none; }
.brand img { width: 54px; height: 54px; }
.brand-copy { display: grid; line-height: 1; }
.brand-name { font-size: clamp(1.65rem, 2.5vw, 2.45rem); color: var(--anthrazit); }
.brand-legal { margin-top: .22rem; color: var(--petrol); font-size: .82rem; letter-spacing: .16em; }

.nav { display: flex; gap: 2rem; align-items: center; }
.nav a {
  text-decoration: none; text-transform: uppercase;
  font-size: .76rem; font-weight: 700; letter-spacing: .14em;
  padding: .5rem 0; border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a:focus-visible { border-bottom-color: var(--petrol); }
.mobile-nav { display: none; }

.hero { border-bottom: 1px solid var(--line); }
.hero-grid {
  min-height: 680px;
  display: grid; grid-template-columns: 1.02fr .98fr;
  background: var(--weiss);
}
.hero-copy {
  display: flex; flex-direction: column; justify-content: center;
  padding: clamp(4rem, 8vw, 8rem) clamp(2rem, 6vw, 6rem);
}
.hero-copy h1 span { display: block; }
.hero-image {
  min-height: 680px;
  background:
    linear-gradient(90deg, rgba(255,255,255,.05), rgba(255,255,255,0)),
    url("../assets/architektur.webp") center / cover no-repeat;
}
.hero-note {
  display: inline-flex; align-items: center; gap: .75rem;
  margin-top: 2.25rem; color: var(--petrol); font-weight: 650;
}
.hero-note::before { content: ""; width: 2.6rem; height: 1px; background: currentColor; }

.section { padding: clamp(5rem, 9vw, 9rem) 0; }
.section.white { background: var(--weiss); }
.section.soft { background: var(--softgrau); }
.two-col { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(3rem, 8vw, 8rem); }
.text-block { max-width: 48rem; font-size: 1.07rem; }

.principles {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.principle {
  padding: 2rem 1.75rem 1rem 0;
  min-height: 260px;
}
.principle + .principle {
  padding-left: 1.75rem;
  border-left: 1px solid var(--line);
}
.icon {
  width: 46px; height: 46px; border: 1px solid var(--petrol); border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 1.6rem; color: var(--petrol);
}
.icon svg { width: 24px; height: 24px; stroke: currentColor; fill: none; stroke-width: 1.7; }

.contact-grid {
  display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}
.contact-card {
  background: var(--weiss); border: 1px solid var(--line);
  border-radius: 26px; padding: clamp(2rem, 5vw, 4rem); box-shadow: var(--shadow);
}
.contact-card a { color: var(--petrol); font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 4px; }

.site-footer { background: var(--anthrazit); color: var(--offwhite); }
.footer-inner {
  min-height: 180px; padding-block: 2.7rem;
  display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center;
}
.footer-brand .brand-name { color: var(--offwhite); font-size: 1.7rem; }
.footer-brand .brand-legal { color: var(--graugruen); }
.footer-links { display: flex; gap: 2rem; flex-wrap: wrap; justify-content: flex-end; }
.footer-links a { text-decoration: none; font-size: .9rem; }
.copyright { color: var(--graugruen); font-size: .84rem; margin-top: 1rem; }

.legal-main { background: var(--weiss); }
.legal-wrap { width: min(calc(100% - 3rem), 860px); margin: 0 auto; padding: 5rem 0 7rem; }
.legal-wrap h1 { font-size: clamp(2.8rem, 6vw, 5rem); margin-bottom: 3rem; }
.legal-wrap h2 { font-family: Inter, sans-serif; font-size: 1.35rem; font-weight: 750; margin: 2.6rem 0 .8rem; }
.legal-wrap h3 { font-family: Inter, sans-serif; font-size: 1.05rem; font-weight: 750; margin-top: 1.8rem; }
.legal-wrap ul { padding-left: 1.25rem; }
.notice {
  margin: 2rem 0; padding: 1.25rem 1.4rem; border-left: 4px solid var(--petrol);
  background: var(--offwhite); color: var(--muted);
}

@media (max-width: 900px) {
  .nav { display: none; }
  .mobile-nav { display: block; position: relative; }
  .mobile-nav summary {
    list-style: none; cursor: pointer; padding: .75rem;
    font-weight: 700; letter-spacing: .08em;
  }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav nav {
    position: absolute; right: 0; top: 3.3rem; min-width: 220px;
    background: var(--weiss); border: 1px solid var(--line);
    border-radius: 16px; padding: .6rem; box-shadow: var(--shadow);
  }
  .mobile-nav a { display: block; padding: .8rem 1rem; text-decoration: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { min-height: 510px; }
  .hero-image { min-height: 440px; background-position: 58% center; }
  .two-col, .contact-grid { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr 1fr; }
  .principle:nth-child(3) { border-left: 0; }
  .principle:nth-child(n+3) { border-top: 1px solid var(--line); padding-top: 2rem; }
}

@media (max-width: 600px) {
  .container { width: min(calc(100% - 2rem), var(--max)); }
  .header-inner { min-height: 76px; }
  .brand img { width: 42px; height: 42px; }
  .brand-name { font-size: 1.6rem; }
  .brand-legal { font-size: .68rem; }
  .hero-copy { min-height: auto; padding: 4.5rem 1.25rem 4rem; }
  .hero-image { min-height: 330px; }
  .section { padding: 4.5rem 0; }
  .principles { grid-template-columns: 1fr; }
  .principle, .principle + .principle {
    border-left: 0; border-top: 1px solid var(--line);
    padding: 1.6rem 0;
    min-height: auto;
  }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}