/* ============================================================
   Schwerkraft Berlin — Static Site
   Design: Dark/Bold Hero + Clean/Minimal Content
   Fonts: System font stack (privacy-first, no external requests)
   ============================================================ */

:root {
  --dark:        #0d0d0d;
  --dark-2:      #161616;
  --dark-border: #2a2a2a;
  --light:       #f8f8f5;
  --light-2:     #f0f0ec;
  --light-border:#e0e0da;
  --text-dark:   #111111;
  --text-light:  #f2f2ee;
  --muted-dark:  #888888;
  --muted-light: #6b6b6b;
  --accent:      #d4cfc8;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui,
          'Helvetica Neue', Arial, sans-serif;

  --max-w: 1200px;
  --gap:   clamp(2rem, 5vw, 4rem);
  --pad:   clamp(1.5rem, 5vw, 4rem);

  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--dark);
  color: var(--text-light);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ---- Focus (Tastaturnavigation) ---- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--text-light);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Utility ---- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--pad);
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--dark-border); }

.nav__logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-light);
  transition: opacity 0.2s;
}
.nav__logo:hover { opacity: 0.7; }

.nav__links {
  display: flex;
  gap: 2rem;
}
.nav__links a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-dark);
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--text-light); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 86svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: calc(var(--pad) * 2) var(--pad) calc(var(--pad) * 1.5);
  background: var(--dark);
  position: relative;
  overflow: hidden;
  isolation: isolate; /* eigener Stacking-Kontext für saubere z-index-Schichten */
}

/* Karo-Muster entfernt */

/* Vignette — über dem Grid, unter dem Inhalt */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 3;
  background: radial-gradient(ellipse at 50% 100%, transparent 40%, var(--dark) 100%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 4;
  max-width: var(--max-w);
  margin-inline: auto;
  width: 100%;
}

/* ============================================================
   PLANET / COSMOS ANIMATION
   ============================================================ */
.hero__cosmos {
  position: absolute;
  inset: 0;
  z-index: 1; /* über dem Hintergrund, unter dem Grid */
  display: flex;
  align-items: flex-end;
  justify-content: center;
  pointer-events: none;
  overflow: hidden;
}

.hero__planet-wrap {
  position: relative;
  /* Planetengröße: groß genug um den Horizont zu füllen */
  width: clamp(480px, 88vw, 1100px);
  height: clamp(480px, 88vw, 1100px);
  flex-shrink: 0;
  /* 82% nach unten schieben → nur ~18% des Planeten sichtbar am Horizont */
  transform: translateY(82%);
}

/* Lichtring – größer als der Planet, erzeugt den sichtbaren Heiligenschein */
.hero__glow {
  position: absolute;
  inset: -28%;   /* 28% auf allen Seiten über den Planeten hinaus */
  border-radius: 50%;
  background: radial-gradient(
    circle at center,
    transparent              0%,
    transparent             66%,   /* Planetenkern – kein Licht */
    rgba(255, 255, 255, 0.8) 72%,  /* weißer Lichtring am Planetenrand */
    rgba(255, 255, 255, 0.4) 78%,
    rgba(255, 255, 255, 0.1) 87%,
    transparent             97%
  );
  filter: blur(7px);           /* statisch – nicht animiert */
  transform: translateZ(0);   /* GPU-Layer erzwingen */
  animation: cosmosGlow 14s ease-in-out infinite;
  will-change: opacity, transform;
}

/* Planetenscheibe – gleiche Farbe wie Hintergrund, deckt das Zentrum ab */
.hero__sphere {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  /* Sehr subtiler Tiefenverlauf – der Planet ist „da", aber unsichtbar */
  background: radial-gradient(
    circle at 42% 38%,
    #0f0f0f  0%,
    #0a0a0a 55%,
    #070707 100%
  );
}

@keyframes cosmosGlow {
  0%   { opacity: 0.38; transform: translateZ(0) scale(0.97) rotate(-0.8deg); }
  18%  { opacity: 0.70; transform: translateZ(0) scale(1.02) rotate( 0.5deg); }
  35%  { opacity: 0.50; transform: translateZ(0) scale(0.99) rotate(-0.3deg); }
  52%  { opacity: 0.85; transform: translateZ(0) scale(1.03) rotate( 1.0deg); }
  68%  { opacity: 0.45; transform: translateZ(0) scale(0.98) rotate(-0.6deg); }
  83%  { opacity: 0.75; transform: translateZ(0) scale(1.01) rotate( 0.4deg); }
  100% { opacity: 0.38; transform: translateZ(0) scale(0.97) rotate(-0.8deg); }
}

.hero__eyebrow {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-dark);
  margin-bottom: 1.5rem;
  opacity: 0;
  transform: translateY(12px);
  animation: fadeUp 0.8s var(--ease) 0.2s forwards;
}

.hero__title {
  font-size: clamp(3rem, 9vw, 8rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--text-light);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.9s var(--ease) 0.4s forwards;
}
.hero__title .line { display: block; }
.hero__title .line--accent { color: var(--accent); }

.hero__divider {
  width: 100%;
  height: 1px;
  background: var(--dark-border);
  margin: 2.5rem 0;
  opacity: 0;
  animation: fadeIn 0.6s var(--ease) 0.9s forwards;
}

.hero__sub {
  max-width: 680px;
  margin-top: 2.5rem;
  font-size: clamp(1rem, 2vw, 1.1875rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--muted-dark);
  opacity: 0;
  transform: translateY(12px);
  animation: fadeUp 0.8s var(--ease) 1s forwards;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services {
  background: var(--dark);
  color: var(--text-light);
  padding: var(--gap) var(--pad) calc(var(--gap) * 2.5);
}
/* Section trägt das padding selbst – Container darf keins doppeln */
.services .container {
  padding-inline: 0;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: clamp(2rem, 5vw, 4.5rem);
  row-gap: 0;
}

.service-card {
  padding: 0;
}

.service-card__num {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted-dark);
  margin-bottom: 1rem;
  font-variant-numeric: tabular-nums;
}

.service-card__title {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1.125rem;
  color: var(--text-light);
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.service-card__list li {
  font-size: clamp(0.9375rem, 1.2vw, 1.0625rem);
  color: var(--muted-dark);
  line-height: 1.55;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  background: var(--dark-2);
  border-top: 1px solid var(--dark-border);
  padding: var(--gap) var(--pad);
}
.contact .container {
  padding-inline: 0;
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.contact__block-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-dark);
  margin-bottom: 1.25rem;
}

.contact__block-body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-light);
}

.contact__link {
  color: var(--accent);
  transition: opacity 0.2s;
}
.contact__link:hover { opacity: 0.7; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--dark);
  border-top: 1px solid var(--dark-border);
  padding: 2rem var(--pad);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: var(--max-w);
  margin-inline: auto;
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--muted-dark);
  line-height: 1.5;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}
.footer__links a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-dark);
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--text-light); }

/* ============================================================
   INNER PAGES (Impressum / Datenschutz)
   ============================================================ */
.inner-page {
  background: var(--dark);
  color: var(--text-light);
  min-height: 100svh;
}

.inner-page .nav {
  background: rgba(13, 13, 13, 0.85);
  border-bottom-color: var(--dark-border);
}
.inner-page .nav__logo { color: var(--text-light); }
.inner-page .nav__links a { color: var(--muted-dark); }
.inner-page .nav__links a:hover { color: var(--text-light); }

.inner-content {
  max-width: 760px;
  margin-inline: auto;
  padding: calc(var(--pad) * 3) var(--pad) var(--gap);
}

.inner-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 2.5rem;
  color: var(--text-light);
}

.inner-content h5, .inner-content h6 {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted-dark);
  margin: 2.5rem 0 0.875rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--dark-border);
}

.inner-content p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-dark);
  margin-bottom: 1rem;
}

.inner-content a {
  color: var(--text-light);
  border-bottom: 1px solid var(--dark-border);
  transition: border-color 0.2s;
}
.inner-content a:hover { border-color: var(--text-light); }

.inner-content ol {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}
.inner-content ol li {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-dark);
  margin-bottom: 0.25rem;
}

.inner-footer {
  background: var(--dark);
  border-top: 1px solid var(--dark-border);
  padding: 2rem var(--pad);
}
.inner-footer .footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: var(--max-w);
  margin-inline: auto;
}
.inner-footer .footer__copy { color: var(--muted-dark); font-size: 0.8125rem; }
.inner-footer .footer__links a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-dark);
  transition: color 0.2s;
}
.inner-footer .footer__links a:hover { color: var(--text-light); }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   KEYFRAMES
   ============================================================ */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  to { opacity: 1; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
    row-gap: calc(var(--gap) * 0.75);
  }
  .contact__inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 580px) {
  .services__grid {
    grid-template-columns: 1fr;
    row-gap: calc(var(--gap) * 0.6);
  }
  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer__links {
    gap: 1rem;
  }
  .nav__logo { font-size: 0.875rem; }

  /* Hero: auf Mobile kein flex-end — Inhalt startet direkt unter der Nav */
  .hero {
    min-height: auto;
    justify-content: flex-start;
    padding-top: calc(4.5rem + var(--pad)); /* Nav-Höhe (~60px) + Abstand */
    padding-bottom: calc(var(--pad) * 1.5);
  }
}