/* ==========================================================================
   ASU Webranitz GmbH — Stylesheet
   Design tokens: deep teal (water/pipe) + muted copper (pipe metal)
   ========================================================================== */

:root {
  /* Color */
  --bg: #FFFFFF;
  --bg-alt: #F1F4F3;
  --ink: #14231F;
  --ink-soft: #47605C;
  --teal-900: #0E3B3A;
  --teal-700: #1C6B67;
  --teal-100: #DCEBE8;
  --copper: #B5652E;
  --copper-dark: #8F4E22;
  --border: #DCE3E1;
  --white: #FFFFFF;

  /* Type */
  --font-display: 'Archivo', 'Arial Black', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --max-width: 1180px;
  --radius: 3px;
  --transition: 180ms ease;
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--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);
  color: var(--teal-900);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 700;
  letter-spacing: -0.01em;
}
p { margin: 0 0 1em; color: var(--ink-soft); }
button { font-family: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--teal-900);
  color: var(--white);
  padding: 10px 16px;
  z-index: 200;
}
.skip-link:focus { left: 8px; top: 8px; }

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--copper);
  color: var(--white);
}
.btn-primary:hover { background: var(--copper-dark); }
.btn-outline {
  background: transparent;
  color: var(--teal-900);
  border-color: var(--border);
}
.btn-outline:hover { border-color: var(--teal-900); background: var(--teal-100); }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 76px;
}
.nav-panel {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  color: var(--teal-900);
}
.brand-mark { color: var(--copper); display: flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--font-display); font-size: 1.05rem; letter-spacing: 0.01em; }
.brand-text em { font-style: normal; font-size: 0.72rem; color: var(--ink-soft); }

.main-nav ul { display: flex; gap: 32px; }
.main-nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 2px;
  background: var(--copper);
  transition: width var(--transition);
}
.main-nav a:hover { color: var(--teal-900); }
.main-nav a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 20px; }
.header-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--teal-900);
}
.header-phone svg { color: var(--copper); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--teal-900);
  transition: transform var(--transition), opacity var(--transition);
}

/* ---------- Hero ---------- */
.hero { background: var(--bg-alt); overflow: hidden; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 40px;
  padding: 88px 24px 72px;
}
.hero-kicker {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--copper-dark);
  margin-bottom: 14px;
}
.hero-copy h1 {
  font-size: clamp(2.1rem, 3.6vw, 3.1rem);
  max-width: 15ch;
}
.hero-sub {
  font-size: 1.08rem;
  max-width: 46ch;
  margin-top: 18px;
}
.hero-cta { display: flex; gap: 14px; margin: 28px 0 40px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 36px;
  margin: 0;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.hero-stats dt {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--teal-900);
  font-weight: 700;
}
.hero-stats dd {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.hero-visual { display: flex; align-items: center; justify-content: center; }
.pipe-schematic { max-width: 460px; }

/* ---------- Trust strip ---------- */
.trust-strip {
  background: var(--teal-900);
  color: var(--teal-100);
}
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  padding: 18px 24px;
  font-size: 0.85rem;
  font-weight: 500;
  justify-content: center;
}

/* ---------- Section shared ---------- */
section { padding: 88px 0; }
.section-head { max-width: 60ch; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); }
.section-head p { font-size: 1.05rem; }

/* ---------- About ---------- */
.about-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.about-text h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); max-width: 16ch; }
.about-points {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.about-points li {
  padding-left: 22px;
  position: relative;
  color: var(--ink);
  font-weight: 500;
}
.about-points li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  background: var(--copper);
  border-radius: 50%;
}
.about-media img {
  border: 1px solid var(--border);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- Services ---------- */
.services { background: var(--bg-alt); }
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.service-card {
  background: var(--white);
  padding: 34px 30px;
  transition: background var(--transition);
}
.service-card:hover { background: var(--teal-100); }
.service-icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--teal-900);
  color: var(--teal-900);
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.service-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.service-card p { font-size: 0.94rem; margin: 0; }

/* ---------- Why Us ---------- */
.why-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: center;
}
.why-media img {
  border: 1px solid var(--border);
  aspect-ratio: 4 / 5;
  object-fit: cover;
}
.why-text h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); max-width: 18ch; margin-bottom: 32px; }
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 32px;
}
.why-item h3 {
  font-size: 1rem;
  color: var(--teal-900);
  margin-bottom: 6px;
  padding-left: 16px;
  border-left: 2px solid var(--copper);
}
.why-item p { font-size: 0.92rem; margin: 0; padding-left: 16px; }

/* ---------- Contact ---------- */
.contact { background: var(--teal-900); color: var(--teal-100); }
.contact-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
.contact-info h2 { color: var(--white); font-size: clamp(1.7rem, 2.6vw, 2.2rem); max-width: 16ch; }
.contact-info p { color: var(--teal-100); max-width: 40ch; }
.contact-details { margin-top: 28px; display: flex; flex-direction: column; gap: 16px; }
.contact-details li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}
.contact-details svg { color: var(--copper); flex-shrink: 0; }
.contact-details a:hover { color: var(--white); text-decoration: underline; }

.contact-form {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px;
  color: var(--ink);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.field { margin-bottom: 20px; display: flex; flex-direction: column; }
.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--teal-900);
  margin-bottom: 6px;
}
.field .optional { font-weight: 400; color: var(--ink-soft); }
.field input,
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 11px 13px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  transition: border-color var(--transition);
  resize: vertical;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--teal-700);
  outline: none;
}
.field.invalid input,
.field.invalid select,
.field.invalid textarea {
  border-color: #B3402E;
}
.field-error {
  color: #B3402E;
  font-size: 0.8rem;
  min-height: 1.1em;
  margin-top: 4px;
}
.contact-form .btn { width: 100%; margin-top: 4px; }
.form-note {
  margin-top: 14px;
  margin-bottom: 0;
  font-size: 0.9rem;
  font-weight: 500;
  min-height: 1.2em;
}
.form-note.success { color: var(--teal-700); }
.form-note.error { color: #B3402E; }

/* ---------- Footer ---------- */
.site-footer { background: #0A2B2A; color: var(--teal-100); }
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  padding: 64px 24px 48px;
}
.footer-brand { display: flex; gap: 12px; }
.footer-brand .brand-mark { color: var(--copper); }
.footer-brand strong { display: block; font-family: var(--font-display); font-size: 0.98rem; color: var(--white); margin-bottom: 6px; }
.footer-brand p { color: var(--teal-100); font-size: 0.88rem; margin: 0; }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-nav h4 { color: var(--white); font-size: 0.85rem; margin-bottom: 14px; }
.footer-nav a {
  display: block;
  color: var(--teal-100);
  font-size: 0.88rem;
  padding: 5px 0;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--copper); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 24px;
  font-size: 0.82rem;
  color: var(--teal-100);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 48px; }
  .hero-visual { order: -1; max-width: 340px; margin: 0 auto 8px; }
  .about-inner,
  .why-inner,
  .contact-inner { grid-template-columns: 1fr; }
  .why-media, .about-media { order: -1; max-width: 420px; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 720px) {
  .nav-panel {
    display: none;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 20px rgba(14, 59, 58, 0.08);
  }
  .nav-toggle { display: flex; }

  .site-header.open .nav-panel {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 24px;
  }
  .nav-panel .main-nav { width: 100%; }
  .nav-panel .main-nav ul { flex-direction: column; gap: 2px; }
  .nav-panel .main-nav a { display: block; padding: 12px 0; }
  .nav-panel .header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    margin-top: 8px;
  }
  .nav-panel .header-phone { justify-content: center; padding: 8px 0; }

  .hero-cta { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; row-gap: 16px; }
  .service-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  section { padding: 56px 0; }
}