/* ============================================================
   IV-BABEL — style.css  (globale Stile)
   Schrift: "DM Serif Display" (Headings) + "DM Sans" (Body)
   Palette: Weiß / Hellgrau / Dunkelgrau / Akzent Anthrazit
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ── Variablen ─────────────────────────────────────────────── */
:root {
  --clr-bg:        #f5f5f3;
  --clr-surface:   #ffffff;
  --clr-border:    #e0e0e0;
  --clr-muted:     #9e9e9e;
  --clr-text:      #205679;
  --clr-text-sec:  #555555;
  --clr-accent:    #943939;
  --clr-accent-lt: #c34d4d;
  --clr-hover:     #f0f0ee;

  --font-head: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  --radius:   6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.09);

  --header-h: 64px;
  --transition: .22s ease;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── HEADER ─────────────────────────────────────────────────── */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  padding: 0 clamp(1rem, 4vw, 3rem);
  gap: 2rem;
  box-shadow: var(--shadow-sm);
}

#site-header .logo {
  flex-shrink: 0;
  height: 40px;
}
#site-header .logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
}

#site-nav {
  display: flex;
  gap: .25rem;
  margin-left: auto;
  align-items: center;
}

#site-nav a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--clr-text-sec);
  padding: .45rem .85rem;
  border-radius: var(--radius);
  letter-spacing: .02em;
  transition: background var(--transition), color var(--transition);
}
#site-nav a:hover,
#site-nav a.active {
  background: var(--clr-hover);
  color: var(--clr-text);
}

/* Hamburger */
#nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .5rem;
  margin-left: auto;
}
#nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
#nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#nav-toggle.open span:nth-child(2) { opacity: 0; }
#nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MAIN / BODY ────────────────────────────────────────────── */
main {
  flex: 1;
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 4vw, 2.5rem) 4rem;
}

/* ── FOOTER ─────────────────────────────────────────────────── */
#site-footer {
  background: var(--clr-accent);
  color: #ffffff;
  font-size: .8rem;
  letter-spacing: .04em;
  text-align: center;
  padding: 1.25rem 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: .5rem 1.5rem;
}
#site-footer a {
  color: #ffffff;
  transition: color var(--transition);
}
#site-footer a:hover { color: #d1d1d1; }
#site-footer .sep { opacity: .35; }

/* ── TYPOGRAPHIE ────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.2;
  color: var(--clr-text);
}
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 1rem; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem);   margin-bottom: .75rem; }
h3 { font-size: 1.2rem; margin-bottom: .5rem; }
h4 { font-size: 1rem; font-family: var(--font-body); font-weight: 600; }
p  { margin-bottom: 1rem; color: var(--clr-text-sec); }

/* ── HILFSKLASSEN ───────────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.btn {
  display: inline-block;
  padding: .65rem 1.5rem;
  background: var(--clr-accent);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: .9rem;
  letter-spacing: .03em;
  transition: background var(--transition);
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--clr-accent-lt); }
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--clr-accent);
  color: var(--clr-accent);
}
.btn-outline:hover { background: var(--clr-hover); }

.section-label {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: .5rem;
}
.divider {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin: 2rem 0;
}

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 700px) {
  #nav-toggle { display: flex; }

  #site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    padding: 1rem;
    gap: .25rem;
    box-shadow: var(--shadow-md);
  }
  #site-nav.open { display: flex; }
  #site-nav a { padding: .7rem 1rem; }
}