/* ============================================
   Die Effizienz Experten – Stylesheet
   Nur Systemschriften, keine externen Dateien.
   ============================================ */

:root {
  --color-bg: #f7f8fa;
  --color-bg-alt: #ffffff;
  --color-text: #1c2430;
  --color-text-soft: #4a5568;
  --color-navy: #10213f;
  --color-navy-soft: #1b2f55;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-border: #e2e6ec;
  --radius: 14px;
  --max-width: 1140px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; font-weight: 700; }

p { margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Sprachumschaltung (reines CSS, kein JS) ---------- */

.lang-radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* Standard: Deutsch sichtbar (checked per HTML-Attribut) */
#lang-en:checked ~ .page .lang-de { display: none !important; }
#lang-de:checked ~ .page .lang-en { display: none !important; }

.lang-switch {
  display: flex;
  gap: 4px;
  margin-left: 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
  background: var(--color-bg-alt);
}

.lang-btn {
  display: inline-block;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 999px;
  cursor: pointer;
  color: var(--color-text-soft);
}

#lang-de:checked ~ .page label.lang-btn[for="lang-de"],
#lang-en:checked ~ .page label.lang-btn[for="lang-en"] {
  background: var(--color-accent);
  color: #fff;
}

footer .lang-switch { margin-left: 0; }

/* ---------- Kopfbereich / Navigation ---------- */

.nav-toggle-checkbox { position: absolute; opacity: 0; width: 0; height: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 19px;
  color: var(--color-navy);
  white-space: nowrap;
}

.logo .accent { color: var(--color-accent); }

/* ---------- Logo-Grafik (SVG-Datei, DE/EN per Sprachumschaltung) ---------- */

.logo-img {
  display: block;
  height: 58px;
  width: auto;
  border-radius: 8px;
}

footer .logo-img { box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3); }

.nav-toggle-label {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 24px;
  cursor: pointer;
}

.nav-toggle-label span {
  display: block;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.main-nav a {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-soft);
}

.main-nav a:hover { color: var(--color-accent-dark); }

.main-nav .btn { margin-left: 4px; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); }

.btn-outline {
  background: transparent;
  border-color: var(--color-bg-alt);
  color: var(--color-bg-alt);
}
.btn-outline:hover { background: rgba(255,255,255,0.12); }

.btn-outline-dark {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-navy);
}
.btn-outline-dark:hover { border-color: var(--color-accent); color: var(--color-accent-dark); }

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-soft) 60%, #163a4f 100%);
  color: #fff;
  padding: 90px 0 100px;
}

.hero-inner {
  max-width: 760px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #a9c6ff;
  background: rgba(37, 99, 235, 0.22);
  border: 1px solid rgba(37, 99, 235, 0.45);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 50px);
  margin-bottom: 20px;
}

.nowrap { white-space: nowrap; }

.hero p.lead {
  font-size: 19px;
  color: #cfd8e3;
  max-width: 600px;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ---------- Branchen-Unterseiten ---------- */

.hero-sub { padding: 64px 0 72px; }

.back-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: #a9c6ff;
  margin-bottom: 22px;
}
.back-link:hover { color: #fff; }

.care-card h3 { font-size: 17px; }

/* ---------- Abschnitte ---------- */

section { padding: 84px 0; }

.section-head {
  max-width: 640px;
  margin: 0 auto 50px;
  text-align: center;
}

.section-tag {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: 10px;
}

.section-head h2 { font-size: clamp(26px, 3.5vw, 34px); }
.section-head p { color: var(--color-text-soft); font-size: 17px; }

.alt-bg { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }

/* ---------- Karten-Raster ---------- */

.grid {
  display: grid;
  gap: 26px;
  grid-template-columns: repeat(3, 1fr);
}

.grid.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 26px;
}

.alt-bg .card { background: var(--color-bg); }

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--color-text-soft); font-size: 15px; margin-bottom: 0; }

/* ---------- Methode / Ablauf ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  counter-reset: step;
}

.step { position: relative; padding-left: 54px; }

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-navy);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}

.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--color-text-soft); font-size: 15px; }

/* ---------- Über uns ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

.about-text p { color: var(--color-text-soft); font-size: 16px; }

.about-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.fact {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px;
  text-align: center;
}

.fact strong { display: block; font-size: 26px; color: var(--color-navy); margin-bottom: 4px; }
.fact span { font-size: 13px; color: var(--color-text-soft); }

.placeholder-note {
  font-size: 13px;
  color: var(--color-text-soft);
  background: #fff7e6;
  border: 1px solid #f0d998;
  border-radius: 10px;
  padding: 10px 14px;
  margin-top: 18px;
}

/* ---------- Beispiele ---------- */

.example { padding: 24px 24px; border-left: 4px solid var(--color-accent); }
.example h3 { font-size: 17px; margin-bottom: 6px; }

/* ---------- Branchen ---------- */

.branchen-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.branche { padding: 26px 22px; display: flex; flex-direction: column; }
.branche h3 { font-size: 18px; margin-bottom: 6px; }
.branche .branche-types { font-size: 13px; color: var(--color-accent-dark); font-weight: 600; margin-bottom: 10px; }

a.branche { transition: border-color 0.15s, transform 0.15s; }
a.branche:hover { border-color: var(--color-accent); transform: translateY(-2px); }

.branche-link { margin-top: auto; padding-top: 14px; font-size: 14px; font-weight: 700; color: var(--color-accent-dark); }

.branche-more { border: 2px dashed var(--color-border); background: transparent; justify-content: center; }

/* ---------- Einstiegs-Angebot ---------- */

.offer {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-soft) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 44px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 36px;
  align-items: center;
}

.offer .section-tag { color: #a9c6ff; }
.offer h2 { font-size: clamp(26px, 3.5vw, 34px); }
.offer p { color: #cfd8e3; font-size: 17px; }

.offer-list { margin: 0; padding-left: 22px; color: #e6ecf3; }
.offer-list li { margin-bottom: 6px; }

/* ---------- Fragen & Antworten ---------- */

.faq { max-width: 780px; margin: 0 auto; }

.faq details {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 52px 18px 22px;
  font-weight: 700;
  font-size: 16.5px;
  color: var(--color-navy);
  position: relative;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
}

.faq details[open] summary::after { content: "–"; }

.faq details p {
  padding: 0 22px 18px;
  margin: 0;
  color: var(--color-text-soft);
  font-size: 15.5px;
}

/* ---------- Kontakt ---------- */

.alt-bg .contact-card { background: var(--color-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.contact-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.contact-card .card-icon { margin: 0 auto 16px; }
.contact-card h3 { font-size: 16px; margin-bottom: 6px; }
.contact-card a, .contact-card span.value { color: var(--color-accent-dark); font-weight: 700; word-break: break-word; }

.contact-cta {
  text-align: center;
  margin-top: 44px;
}

/* ---------- Footer ---------- */

footer {
  background: var(--color-navy);
  color: #cfd8e3;
  padding: 46px 0 28px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 20px;
}

footer .logo { color: #fff; }

.footer-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  font-size: 14px;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 13px;
  color: #93a1b8;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Rechtsseiten (Impressum / Datenschutz) ---------- */

.legal-page main {
  padding: 60px 0 90px;
}

.legal-box {
  max-width: 760px;
  margin: 0 auto;
}

.legal-box h1 { font-size: 30px; margin-bottom: 26px; }
.legal-box h2 { font-size: 20px; margin-top: 36px; }
.legal-box p, .legal-box li { color: var(--color-text-soft); font-size: 15.5px; }

.fill-me {
  background: #fff7e6;
  border: 1px dashed #e0b14a;
  padding: 2px 8px;
  border-radius: 6px;
  color: #8a5a00;
  font-weight: 600;
}

.legal-hint {
  background: #eef6ff;
  border: 1px solid #bcdcff;
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 34px;
  font-size: 14.5px;
  color: #234;
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .grid, .grid.grid-2, .steps, .contact-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .offer { grid-template-columns: 1fr; padding: 32px 24px; }
}

@media (max-width: 1000px) {
  .branchen-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .branchen-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1080px) {
  .nav-toggle-label { display: flex; }

  .main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    margin-top: 12px;
  }

  .nav-toggle-checkbox:checked ~ .header-inner .main-nav {
    display: flex;
  }

  .main-nav .btn { margin-left: 0; }
}

@media (max-width: 760px) {
  .hero { padding: 60px 0 70px; }
  section { padding: 56px 0; }

  .footer-inner { flex-direction: column; }
}