/* =====================================================
   RT. BAU Robert Topolewski – Landingpage
   Farbschema exakt nach Visitenkarte & Firmenwagen:
   - Markenblau  #1A9BD7  (Banner-Balken, "BAU", Dach)
   - Anthrazit   #2E3A45  ("RT.", Name, Haus-Kontur)
   - Hintergrund Weiß / Hellgrau
   ===================================================== */

:root {
  --blue:        #1A9BD7;   /* Markenblau (Balken auf Karte & Transporter) */
  --blue-dark:   #0F7CB2;   /* Hover / Verlauf-Tiefe */
  --blue-tint:   #E4F3FB;   /* sehr helles Blau für Flächen/Icons */
  --anthracite:  #2E3A45;   /* Logo-Kontur & Haupttext */
  --anthracite-deep: #232D36;
  --gray-bg:     #F4F6F8;   /* heller Sektionshintergrund */
  --gray-line:   #DDE3E8;
  --gray-text:   #5B6770;
  --white:       #FFFFFF;

  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body:    "Barlow", "Segoe UI", Arial, sans-serif;

  --radius: 10px;
  --shadow: 0 10px 30px rgba(35, 45, 54, 0.10);
  --container: 1140px;
}

/* ---------- Reset & Basics ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--anthracite);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: min(var(--container), 92%);
  margin-inline: auto;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- Typografie ---------- */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.2px;
  text-wrap: balance;
}

h2 { font-size: clamp(2rem, 4.2vw, 3rem); }
h3 { font-size: 1.45rem; text-transform: uppercase; letter-spacing: 0.6px; }

.eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--blue);
  margin-bottom: 0.6rem;
}
.eyebrow-light { color: #7FCBEE; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn .icon { width: 1.05em; height: 1.05em; fill: currentColor; }

.btn-primary {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: var(--white);
  box-shadow: 0 6px 18px rgba(26, 155, 215, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(26, 155, 215, 0.45); }

.btn-ghost {
  border-color: var(--anthracite);
  color: var(--anthracite);
  background: transparent;
}
.btn-ghost:hover { background: var(--anthracite); color: var(--white); }

.btn-lg { padding: 0.95rem 1.8rem; font-size: 1.15rem; }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* =====================================================
   HEADER
   ===================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  padding-block: 0.7rem;
}

/* Logo */
.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand-logo { width: 46px; height: 40px; flex-shrink: 0; }
.logo-roof   { stroke: var(--blue); }
.logo-walls  { stroke: var(--anthracite); }
.logo-window { fill: var(--blue); }

.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.5px;
}
.rt  { color: var(--anthracite); }
.bau { color: var(--blue); }
.brand-owner {
  font-size: 0.78rem;
  color: var(--gray-text);
  letter-spacing: 0.5px;
}

/* Navigation */
.main-nav { display: flex; gap: 1.6rem; }
.main-nav a {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--anthracite);
  padding: 0.35rem 0;
  position: relative;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 3px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.main-nav a:hover::after { transform: scaleX(1); }

.header-actions { display: flex; align-items: center; gap: 0.9rem; }

/* Sprachumschalter */
.lang-switch {
  display: inline-flex;
  border: 2px solid var(--anthracite);
  border-radius: var(--radius);
  overflow: hidden;
}
.lang-btn {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 1px;
  padding: 0.42rem 0.75rem;
  background: transparent;
  color: var(--anthracite);
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.lang-btn.is-active { background: var(--anthracite); color: var(--white); }
.lang-btn:not(.is-active):hover { background: var(--gray-bg); }

/* Burger (mobil) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
}
.nav-toggle span {
  width: 26px; height: 3px;
  background: var(--anthracite);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* =====================================================
   HERO
   ===================================================== */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 500px at 85% -10%, var(--blue-tint) 0%, transparent 60%),
    var(--white);
  overflow: hidden;
}

/* dezente Bauplan-Rasterlinien */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 155, 215, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 155, 215, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 85%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  padding: clamp(4rem, 9vw, 7.5rem) 0 clamp(3.5rem, 7vw, 6rem);
  max-width: 820px;
}

.hero-title {
  font-size: clamp(3rem, 8.5vw, 5.6rem);
  text-transform: uppercase;
  color: var(--anthracite);
}
.hero-title .accent { color: var(--blue); }

.hero-sub {
  margin-top: 1.4rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--gray-text);
  max-width: 620px;
}

.hero-ctas {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --- Signatur: laufender Leistungsbalken (wie auf Karte & Transporter) --- */
.service-band {
  background: linear-gradient(90deg, var(--blue) 0%, var(--blue-dark) 100%);
  overflow: hidden;
  padding-block: 0.75rem;
  border-top: 3px solid var(--anthracite);
}
.service-band-track {
  display: flex;
  gap: 1.6rem;
  width: max-content;
  animation: band-scroll 28s linear infinite;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--white);
  white-space: nowrap;
}
.service-band .dot { opacity: 0.75; }

@keyframes band-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* =====================================================
   SEKTIONEN – Allgemein
   ===================================================== */
.section { padding-block: clamp(3.5rem, 8vw, 6rem); }

.section-head {
  max-width: 720px;
  margin-bottom: clamp(2.2rem, 5vw, 3.5rem);
}

/* ---------- Leistungen ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.4rem;
}

.card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-top: 4px solid var(--blue);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(35, 45, 54, 0.16);
}

.card-icon {
  width: 62px; height: 62px;
  display: grid;
  place-items: center;
  background: var(--blue-tint);
  color: var(--blue);
  border-radius: var(--radius);
  margin-bottom: 1.1rem;
}
.card-icon svg { width: 36px; height: 36px; }

.card h3 { color: var(--anthracite); margin-bottom: 0.55rem; }
.card p  { color: var(--gray-text); font-size: 0.98rem; }

/* ---------- Warum RT. BAU (dunkle Sektion) ---------- */
.section-dark {
  background:
    linear-gradient(180deg, var(--anthracite) 0%, var(--anthracite-deep) 100%);
  color: var(--white);
}
.section-dark h2 { color: var(--white); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem 2.4rem;
}

.why-item { position: relative; padding-left: 1.3rem; }
.why-mark {
  position: absolute;
  left: 0; top: 0.3rem;
  width: 5px; height: calc(100% - 0.5rem);
  background: var(--blue);
  border-radius: 3px;
}
.why-item h3 { color: var(--white); margin-bottom: 0.45rem; font-size: 1.3rem; }
.why-item p  { color: #B9C4CC; font-size: 0.97rem; }

/* ---------- Ablauf ---------- */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.6rem;
  counter-reset: step;
}

.step {
  position: relative;
  background: var(--gray-bg);
  border-radius: var(--radius);
  padding: 2rem 1.6rem 1.7rem;
  border: 1px solid var(--gray-line);
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  margin-bottom: 1rem;
  box-shadow: 0 6px 16px rgba(26, 155, 215, 0.4);
}
.step h3 { margin-bottom: 0.5rem; }
.step p  { color: var(--gray-text); font-size: 0.97rem; }

/* ---------- Kontakt ---------- */
.section-contact { background: var(--gray-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.contact-text { color: var(--gray-text); margin-top: 0.4rem; max-width: 480px; }

.contact-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}
.badge {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--blue-dark);
  background: var(--blue-tint);
  border: 1px solid rgba(26, 155, 215, 0.35);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
}

.contact-card {
  font-style: normal;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-line);
  border-top: 4px solid var(--blue);
  box-shadow: var(--shadow);
  padding: 0.6rem 0;
}

.contact-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.05rem 1.4rem;
  transition: background 0.15s ease;
}
.contact-row + .contact-row { border-top: 1px solid var(--gray-line); }
.contact-row:hover { background: var(--blue-tint); }

.contact-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  background: var(--anthracite);
  border-radius: 10px;
}
.contact-icon svg { width: 22px; height: 22px; fill: var(--white); }

.contact-label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--gray-text);
}
.contact-value {
  display: block;
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--anthracite);
}

/* =====================================================
   FOOTER
   ===================================================== */
.site-footer {
  background: var(--anthracite-deep);
  color: #B9C4CC;
  text-align: center;
}
.footer-band {
  height: 6px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--blue-dark) 100%);
}
.footer-inner { padding-block: 2.4rem; }

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--white);
}
.footer-brand .bau { color: var(--blue); }

.footer-services {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue);
  margin-top: 0.2rem;
}

.footer-meta { margin-top: 0.9rem; font-size: 0.95rem; }
.footer-meta a { color: var(--white); text-decoration: underline; text-underline-offset: 3px; }
.footer-meta a:hover { color: var(--blue); }

.footer-copy { margin-top: 0.7rem; font-size: 0.85rem; opacity: 0.7; }

/* =====================================================
   Scroll-Reveal
   ===================================================== */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* =====================================================
   Responsiv
   ===================================================== */
@media (max-width: 900px) {
  .header-cta span { display: none; }        /* nur Telefon-Icon */
  .header-cta { padding: 0.65rem 0.8rem; }

  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-line);
    box-shadow: var(--shadow);
    display: none;
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 0.95rem 5%; border-top: 1px solid var(--gray-line); }
  .main-nav a::after { display: none; }

  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .brand-owner { display: none; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .service-band-track { font-size: 1.1rem; }
}

/* =====================================================
   Reduzierte Bewegung
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .service-band-track { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .card { transition: none; }
}