/* Brückwerk – seriös-mittelständisch. Bewusst nur Systemschriften (keine externen Fonts, DSGVO). */
:root {
  --ink: #12222b;
  --ink-soft: #4a5a63;
  --petrol: #0f3b4c;
  --petrol-2: #16536a;
  --accent: #2a9d8f;
  --accent-soft: #e3f3f1;
  --bg: #ffffff;
  --bg-alt: #f4f7f8;
  --line: #dde5e8;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15, 59, 76, .06), 0 8px 24px rgba(15, 59, 76, .06);
  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.6; font-size: 17px; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: var(--petrol-2); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; color: var(--petrol); letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; }
h3 { font-size: 1.12rem; font-weight: 650; }
p { margin: 0 0 1em; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 650; color: var(--accent); margin-bottom: .8em; }
.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 38em; }
.small { font-size: .85rem; color: var(--ink-soft); margin: 0; }

/* Buttons */
.btn { display: inline-block; background: var(--petrol); color: #fff; text-decoration: none; font-weight: 600; padding: .85em 1.4em; border-radius: 8px; border: 2px solid var(--petrol); transition: background .15s, border-color .15s; }
.btn:hover { background: var(--petrol-2); border-color: var(--petrol-2); }
.btn-ghost { background: transparent; color: var(--petrol); }
.btn-ghost:hover { background: var(--accent-soft); color: var(--petrol); }
.btn-small { padding: .5em 1em; font-size: .92rem; }
.btn-block { display: block; text-align: center; margin: 1.2em 0 .6em; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: .65em; text-decoration: none; color: var(--petrol); font-weight: 700; font-size: 1.2rem; }
.logo svg { width: 34px; height: 34px; }
.logo small { display: block; font-size: .68rem; font-weight: 500; color: var(--ink-soft); letter-spacing: .04em; line-height: 1.1; }
.logo span { line-height: 1.15; }
.nav { display: flex; align-items: center; gap: 1.6em; }
.nav a:not(.btn) { color: var(--ink); text-decoration: none; font-size: .95rem; }
.nav a:not(.btn):hover { color: var(--accent); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 6px; padding: .45em .9em; font: inherit; color: var(--petrol); cursor: pointer; }

/* Hero */
.hero { padding: 88px 0 96px; background: linear-gradient(180deg, var(--bg-alt), #fff 85%); }
.hero-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 64px; align-items: center; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.8em; }
.hero-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 28px; }
.bridge-visual { display: grid; grid-template-columns: auto 1fr auto; align-items: end; gap: 0; color: var(--accent); margin-bottom: 24px; }
.bridge-visual svg { width: 100%; height: 70px; }
.pillar { background: var(--petrol); color: #fff; font-size: .78rem; font-weight: 600; padding: 10px 12px; border-radius: 6px; text-align: center; max-width: 110px; line-height: 1.25; }
.facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.facts li { display: flex; align-items: baseline; gap: 14px; border-top: 1px solid var(--line); padding-top: 14px; }
.facts strong { font-size: 1.7rem; color: var(--petrol); min-width: 3.2ch; }
.facts span { color: var(--ink-soft); font-size: .95rem; }

/* Sections */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head p:last-child { color: var(--ink-soft); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }

.pain { border-left: 3px solid var(--accent); padding: 4px 0 4px 20px; }
.pain p { color: var(--ink-soft); margin: 0; }

.service { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; transition: box-shadow .2s, transform .2s; }
.service:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.service p { color: var(--ink-soft); margin: 0; font-size: .97rem; }
.icon { width: 46px; height: 46px; border-radius: 10px; background: var(--accent-soft); display: grid; place-items: center; margin-bottom: 18px; }
.icon svg, .contact-line svg { width: 24px; height: 24px; fill: none; stroke: var(--petrol); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* Tabs */
.tabs { display: inline-flex; flex-wrap: wrap; gap: 6px; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 5px; margin-bottom: 28px; }
.tabs button { font: inherit; font-size: .95rem; font-weight: 600; border: 0; background: none; color: var(--ink-soft); padding: .55em 1.1em; border-radius: 7px; cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--petrol); color: #fff; }
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; }
.case p { color: var(--ink-soft); font-size: .97rem; flex: 1; }
.effect { align-self: flex-start; background: var(--accent-soft); color: var(--petrol); font-size: .85rem; font-weight: 600; padding: .35em .8em; border-radius: 999px; }

/* About */
.about { display: grid; grid-template-columns: 300px 1fr; gap: 64px; align-items: start; }
.portrait { aspect-ratio: 4 / 5; border-radius: 14px; background: linear-gradient(150deg, var(--petrol), var(--petrol-2) 60%, var(--accent)); color: rgba(255,255,255,.9); display: grid; place-items: center; font-size: 4rem; font-weight: 700; letter-spacing: .05em; }
.portrait-caption { margin-top: 14px; color: var(--ink-soft); font-size: .95rem; }
.portrait-caption strong { color: var(--petrol); }
.timeline { list-style: none; padding: 0; margin: 2em 0 1em; border-left: 2px solid var(--line); }
.timeline li { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 0 0 18px 22px; position: relative; }
.timeline li::before { content: ""; position: absolute; left: -7px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); }
.timeline li:first-child::before { background: var(--accent); }
.timeline span { font-weight: 600; color: var(--petrol); font-size: .92rem; }
.timeline div { color: var(--ink-soft); font-size: .97rem; }
.placeholder-note { font-size: .8rem; color: #8a979d; font-style: italic; }

/* Steps */
.section-dark { background: var(--petrol); color: #d6e4e9; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .eyebrow { color: #7fd6cb; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: s; }
.steps li { position: relative; padding-top: 8px; }
.step-no { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; border: 2px solid #7fd6cb; color: #fff; font-weight: 700; margin-bottom: 18px; background: var(--petrol); position: relative; z-index: 1; }
.steps li:not(:last-child)::after { content: ""; position: absolute; top: 30px; left: 52px; right: -16px; height: 2px; background: rgba(127, 214, 203, .35); }
.steps p { margin: 0; font-size: .97rem; }

/* Principles */
.principles h3 { padding-top: 16px; border-top: 3px solid var(--accent); }
.principles p { color: var(--ink-soft); font-size: .97rem; margin: 0; }

/* FAQ */
details { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; }
summary { cursor: pointer; padding: 18px 52px 18px 22px; font-weight: 600; color: var(--petrol); list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); font-size: 1.4rem; font-weight: 400; color: var(--accent); }
details[open] summary::after { content: "–"; }
details p { padding: 0 22px 18px; margin: 0; color: var(--ink-soft); }

/* Contact */
.contact { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: center; }
.contact > div:first-child p { color: var(--ink-soft); font-size: 1.08rem; }
.contact-card { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 14px; padding: 32px; }
.contact-line { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 600; padding: 10px 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.contact-line:hover { color: var(--accent); }

/* Footer */
.site-footer { background: var(--ink); color: #9fb0b8; font-size: .9rem; padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: #d6e4e9; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* Legal pages */
.legal { padding: 64px 0 96px; }
.legal h2 { font-size: 1.3rem; margin-top: 1.6em; }

/* Responsive */
@media (max-width: 980px) {
  .hero-grid, .about, .contact { grid-template-columns: 1fr; gap: 40px; }
  .grid-3, .cases { grid-template-columns: 1fr 1fr; }
  .grid-4, .steps { grid-template-columns: 1fr 1fr; }
  .steps li::after { display: none; }
  .about-portrait { max-width: 260px; }
}
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 24px 20px; }
  .nav.open { display: flex; }
  .nav a:not(.btn) { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav .btn { margin-top: 14px; text-align: center; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .hero { padding: 56px 0 64px; }
  .section { padding: 64px 0; }
  .grid-3, .grid-4, .cases, .steps { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  .tabs { display: flex; }
  .tabs button { flex: 1 1 auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .service { transition: none; }
}