/* ==========================================================================
   ALTERA FACILITY SOLUTIONS – zentrales Stylesheet
   --------------------------------------------------------------------------
   Aufbau:
   1. Design-Token (Farben, Schrift, Abstände)
   2. Basis & Typografie
   3. Layout-Helfer (Container, Grids, Sektionen)
   4. Header & Navigation
   5. Hero-Bereiche
   6. Komponenten (Buttons, Karten, CTA-Banner, Feature-Blöcke)
   7. Footer
   8. Responsive Anpassungen (mobile-first: Basis = Mobil, min-width = größer)
   --------------------------------------------------------------------------
   Markenfarben (exakt aus dem Logo):
   Blau "Dark Night"  #0C1530   |   Orange  #FF6400   |   Grau  #474F5B
   ========================================================================== */

/* 1. Design-Token ---------------------------------------------------------- */
:root {
  --navy:   #0C1530;            /* Primärfarbe (Logo) */
  --orange: #FF6400;            /* Akzentfarbe (Logo) */
  --slate:  #474F5B;            /* Textgrau (Logo) */
  --light:  #F4F6F9;            /* neutraler Sektionshintergrund */
  --line:   #E3E7EE;            /* neutrale Linien/Rahmen */
  --white:  #FFFFFF;

  --font: "Helvetica Neue", Helvetica, Arial, "Segoe UI", sans-serif;

  --container: 1140px;          /* maximale Inhaltsbreite */
  --radius: 6px;
  --header-h: 76px;
}

/* 2. Basis & Typografie ---------------------------------------------------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  color: var(--slate);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  color: var(--navy);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(1.9rem, 5vw, 3.3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin-bottom: 1rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.6rem; }

p + p { margin-top: 1em; }

a { color: var(--orange); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

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

/* Kicker = kleine orange Zeile über Überschriften */
.kicker {
  display: block;
  color: var(--orange);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

/* 3. Layout-Helfer ---------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 22px;
}

.section { padding: 3.5rem 0; }
.section-alt { background: var(--light); }            /* heller Wechselhintergrund */
.section-dark { background: var(--navy); }            /* dunkle Markensektion */
.section-dark h2, .section-dark h3 { color: var(--white); }
.section-dark p { color: rgba(255, 255, 255, 0.82); }

.section-intro { max-width: 760px; margin-bottom: 2.5rem; }

.grid {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: 1fr;                          /* Mobil: eine Spalte */
}

/* Zweispaltiger Text/Bild-Block */
.split {
  display: grid;
  gap: 2.2rem;
  grid-template-columns: 1fr;
  align-items: center;
}
.split img { border-radius: var(--radius); width: 100%; height: 100%; object-fit: cover; }

/* 4. Header & Navigation ---------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

/* Header läuft über die volle Breite: Logo ganz links, Menü ganz rechts */
.site-header .container {
  max-width: none;
  padding: 0 28px;
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand img { height: 48px; width: auto; }

/* Hauptnavigation: mobil als ausklappbares Panel, ab 900px als Zeile */
.main-nav {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  padding: 0.6rem 0 1rem;
}
.main-nav.open { display: block; }

.main-nav ul { list-style: none; }

.main-nav a {
  display: block;
  padding: 0.65rem 22px;
  color: var(--navy);
  font-weight: 600;
  font-size: 1rem;
}
.main-nav a:hover, .main-nav a:focus { color: var(--orange); text-decoration: none; }
.main-nav a.active { color: var(--orange); }

/* Hamburger-Button (nur mobil sichtbar) */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--navy);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.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); }

/* 5. Hero-Bereiche ----------------------------------------------------------- */
.hero {
  background-color: var(--navy);                       /* Fallback, falls Bild fehlt */
  background-size: cover;
  background-position: center;
  color: var(--white);
  display: flex;
  align-items: center;
}

.hero h1 { color: var(--white); max-width: 17em; }

.hero .lead {
  color: rgba(255, 255, 255, 0.85);
  max-width: 38em;
  margin-top: 1.2rem;
  font-size: 1.1rem;
}

.hero .hero-actions { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.9rem; }

.hero-home { min-height: calc(92vh - var(--header-h)); padding: 4.5rem 0; }
.hero-sub  { min-height: 320px; padding: 3.5rem 0; }

/* 6. Komponenten ------------------------------------------------------------- */

/* Buttons – Hover über Transparenz, damit nur Original-Markenfarben verwendet werden */
.btn {
  display: inline-block;
  background: var(--orange);
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.85rem 1.7rem;
  border-radius: var(--radius);
  transition: opacity 0.15s ease;
}
.btn:hover, .btn:focus { opacity: 0.85; text-decoration: none; }

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.75);
  color: var(--white);
}
.btn-outline:hover, .btn-outline:focus { border-color: var(--white); opacity: 1; background: rgba(255,255,255,0.08); }

/* Karten (Grundwerte, Leistungen, Gründe)
   Hover-Effekt wie bei den Teaser-Karten – bewusst auch ohne Link. */
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(12, 21, 48, 0.10);
}

.card .card-num {
  display: block;
  color: var(--orange);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.7rem;
}

.card p { font-size: 0.98rem; }

/* Karten auf dunklem Grund: aufgehellt über transparentes Weiß */
.section-dark .card {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.14);
}
.section-dark .card:hover {
  background: rgba(255, 255, 255, 0.10);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.section-dark .card h3 { color: var(--white); }
.section-dark .card p { color: rgba(255, 255, 255, 0.8); }

/* Teaser-Karten mit Bild (Startseite) */
.teaser {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.teaser:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(12, 21, 48, 0.10); }
.teaser img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; }
.teaser .teaser-body { padding: 1.5rem 1.5rem 1.7rem; }
.teaser .more { display: inline-block; margin-top: 0.9rem; font-weight: 700; }
a.teaser-link { text-decoration: none; color: inherit; }
a.teaser-link:hover { text-decoration: none; }

/* CTA-Banner (dunkelblau, zentriert) */
.cta-banner { text-align: center; }
.cta-banner h2 { margin-bottom: 0.6rem; }
.cta-banner p { max-width: 620px; margin: 0 auto 1.8rem; }

/* Beteiligungs-Feature (z. B. DAV) */
.feature-meta {
  color: var(--orange);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

/* 7. Footer (kompakt: Logo + Kontaktzeile + Copyright) ------------------------ */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.8);
  padding: 2rem 0 0;
  font-size: 0.95rem;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-bottom: 1.6rem;
}

.site-footer img.footer-logo { height: 42px; width: auto; }

.footer-contact { margin: 0; }

.site-footer a { color: rgba(255, 255, 255, 0.8); }
.site-footer a:hover, .site-footer a:focus { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding: 1.1rem 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  justify-content: space-between;
}
.footer-bottom a { color: rgba(255, 255, 255, 0.7); }
.footer-bottom a:hover { color: var(--white); }
.footer-legal-links a { margin-left: 1.2rem; }
.footer-legal-links a:first-child { margin-left: 0; }

/* Rechtsseiten (Impressum): schmale, gut lesbare Textspalte */
.legal { max-width: 720px; }
.legal h2 {
  font-size: 1.15rem;
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
}
.legal h2:first-child { margin-top: 0; }
.legal p { margin-bottom: 0.4rem; }

/* 8. Responsive Anpassungen --------------------------------------------------- */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .section { padding: 5.5rem 0; }

  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }

  .split { grid-template-columns: 1fr 1fr; }
  .split.split-rev > .split-media { order: 2; }        /* Bild rechts */

  /* Navigation als horizontale Zeile */
  .nav-toggle { display: none; }
  .main-nav {
    display: block;
    position: static;
    border: 0;
    padding: 0;
    background: transparent;
  }
  .main-nav ul { display: flex; gap: 2rem; }
  .main-nav a { padding: 0.4rem 0; position: relative; }
  .main-nav a.active::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -4px;
    height: 3px;
    background: var(--orange);
  }
}

/* Nutzer mit reduzierter Bewegung: Animationen abschalten */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .teaser, .card, .btn, .nav-toggle span { transition: none; }
}