/* ============================================
   ESA Dienstleistung GmbH — Stylesheet
   ============================================ */

:root {
  /* Color tokens */
  --color-ink: #14212E;
  --color-steel: #1F3346;
  --color-steel-light: #3A4C5E;
  --color-accent: #E1600D;
  --color-accent-dark: #C24F07;
  --color-bg: #F6F5F2;
  --color-surface: #FFFFFF;
  --color-border: #E2E4E7;
  --color-text: #1F2933;
  --color-text-muted: #5B6672;

  /* Type */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;

  /* Layout */
  --container-width: 1160px;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(20, 33, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 33, 46, 0.10);
  --transition: 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--color-ink);
}
p { margin: 0 0 1em; color: var(--color-text-muted); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-ink); }
.btn-outline:hover { border-color: var(--color-ink); background: var(--color-ink); color: #fff; }
.btn-small { padding: 9px 18px; font-size: 0.875rem; }
.btn-full { width: 100%; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 245, 242, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.is-scrolled { border-color: var(--color-border); box-shadow: var(--shadow-sm); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  background: var(--color-ink);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 6px;
  letter-spacing: 0.02em;
}
.logo-text { font-family: var(--font-display); font-weight: 600; font-size: 1rem; color: var(--color-ink); }

.main-nav ul { display: flex; gap: 32px; }
.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 4px 0;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.main-nav a:hover::after,
.main-nav a.is-active::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 16px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span { display: block; width: 100%; height: 2px; background: var(--color-ink); transition: transform var(--transition), opacity var(--transition); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero { padding: 88px 0 64px; overflow: hidden; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}
.hero-content h1 { font-size: clamp(2rem, 4vw, 2.9rem); max-width: 20ch; letter-spacing: -0.01em; }
.hero-lead { font-size: 1.05rem; max-width: 46ch; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin: 28px 0 40px; }

.hero-stats { display: flex; gap: 40px; margin: 0; }
.hero-stats dt { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; color: var(--color-ink); }
.hero-stats dd { margin: 2px 0 0; font-size: 0.85rem; color: var(--color-text-muted); }

.hero-visual { display: flex; justify-content: center; }
.route-diagram { width: 100%; max-width: 420px; height: auto; }

/* Trust bar */
.trust-bar { background: var(--color-ink); }
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 40px;
  justify-content: center;
  padding: 18px 24px;
  color: #C9D2DA;
  font-size: 0.85rem;
  font-weight: 500;
}

/* ===== Section shared ===== */
section { padding: 96px 0; }
.section-heading { max-width: 620px; margin: 0 auto 56px; text-align: center; }
.section-heading h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
.section-heading p { font-size: 1.02rem; }

/* About */
.about-inner { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 64px; align-items: center; }
.about-image img { border-radius: var(--radius); box-shadow: var(--shadow-md); aspect-ratio: 9/7; object-fit: cover; }
.about-content h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); max-width: 16ch; }
.about-facts { display: flex; flex-direction: column; gap: 14px; margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--color-border); }
.about-facts li { display: flex; justify-content: space-between; font-size: 0.95rem; max-width: 360px; }
.fact-label { color: var(--color-text-muted); }
.about-facts li span:last-child { font-weight: 600; color: var(--color-ink); text-align: right; }

/* Services */
.services { background: var(--color-surface); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border-radius: 8px;
  background: var(--color-ink);
  color: var(--color-accent);
  margin-bottom: 20px;
}
.service-icon svg { width: 24px; height: 24px; }
.service-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.service-card p { font-size: 0.92rem; margin: 0; }

/* Why Us */
.why-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center; }
.why-content h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); max-width: 15ch; }
.benefit-list { display: flex; flex-direction: column; gap: 22px; margin-top: 28px; }
.benefit-list li { display: flex; gap: 16px; align-items: flex-start; }
.check {
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  margin-top: 2px;
}
.benefit-list strong { display: block; color: var(--color-ink); font-size: 1rem; margin-bottom: 2px; }
.benefit-list span { font-size: 0.92rem; color: var(--color-text-muted); }
.why-image img { border-radius: var(--radius); box-shadow: var(--shadow-md); aspect-ratio: 9/7; object-fit: cover; }

/* Contact */
.contact { background: var(--color-ink); }
.contact h2 { color: #fff; }
.contact-inner { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; }
.contact-info p { color: #9FADB8; }
.contact-details { display: flex; flex-direction: column; gap: 22px; margin-top: 32px; }
.contact-details li { display: flex; flex-direction: column; gap: 4px; }
.detail-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-accent); font-weight: 600; }
.contact-details span:not(.detail-label) { color: #D7DEE4; font-size: 0.98rem; }
.contact-details a { color: #D7DEE4; }
.contact-details a:hover { color: var(--color-accent); }

.contact-form {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-md);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; display: flex; flex-direction: column; }
.form-group label { font-size: 0.88rem; font-weight: 600; color: var(--color-ink); margin-bottom: 6px; }
.optional { font-weight: 400; color: var(--color-text-muted); }
.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 11px 13px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { outline: none; border-color: var(--color-accent); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea { border-color: #D64545; }
.error-message { font-size: 0.8rem; color: #D64545; min-height: 1.1em; margin-top: 4px; }
.form-status { text-align: center; font-size: 0.9rem; font-weight: 500; margin: 14px 0 0; min-height: 1.2em; }
.form-status.success { color: #1E7B45; }
.form-status.error { color: #D64545; }

/* ===== Footer ===== */
.site-footer { background: var(--color-steel); color: #B9C4CD; }
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 72px 24px 48px;
}
.footer-brand .logo-mark { margin-bottom: 16px; }
.footer-brand p { color: #9BA9B3; font-size: 0.9rem; max-width: 32ch; }
.footer-col h4 { color: #fff; font-size: 0.92rem; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 11px; }
.footer-col a { color: #B9C4CD; font-size: 0.9rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--color-accent); }
.footer-contact li { color: #B9C4CD; font-size: 0.9rem; }

.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); }
.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px 24px;
  font-size: 0.82rem;
}
.footer-bottom p { margin: 0; color: #8B99A3; }
.footer-bottom ul { display: flex; gap: 24px; }
.footer-bottom a { color: #8B99A3; }
.footer-bottom a:hover { color: #fff; }

/* ===== Scroll-reveal ===== */
[data-animate] { opacity: 0; transform: translateY(16px); transition: opacity 600ms ease, transform 600ms ease; }
[data-animate].is-visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-inner, .about-inner, .why-inner, .contact-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 320px; margin: 0 auto; }
  .about-image, .why-image { order: -1; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }
  .main-nav.is-open { max-height: 320px; box-shadow: var(--shadow-md); }
  .main-nav ul { flex-direction: column; gap: 0; padding: 8px 24px 16px; }
  .main-nav a { display: block; padding: 12px 0; }
  .nav-toggle { display: flex; }
  .header-actions .btn-small { display: none; }

  .hero { padding: 48px 0 40px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  section { padding: 64px 0; }
  .services-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
  .footer-inner { grid-template-columns: 1fr; padding: 56px 24px 40px; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}