/* ==========================================================================
   sp[it] – Stylesheet für index.html, impressum.html, datenschutz.html
   Reines CSS, keine Abhängigkeiten. Farben unten als Custom Properties –
   zum Umfärben genügt der :root-Block.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design-Tokens
   -------------------------------------------------------------------------- */

:root {
  /* Farben */
  --bg:            #0b0e13;
  --bg-elevated:   #141922;
  --bg-subtle:     #10141b;
  --border:        #232a36;
  --border-strong: #333d4d;
  --text:          #e6e9ef;
  --text-muted:    #98a1b3;

  --accent:        #38bdf8;   /* technisches Cyan */
  --accent-strong: #7dd3fc;
  --accent-dim:    rgba(56, 189, 248, 0.12);
  --accent-glow:   rgba(56, 189, 248, 0.25);

  /* Alternative „Terminal-Grün" – zum Wechseln die vier Zeilen oben durch
     diese ersetzen:
     --accent:        #3ddc97;
     --accent-strong: #6ee7b7;
     --accent-dim:    rgba(61, 220, 151, 0.12);
     --accent-glow:   rgba(61, 220, 151, 0.25);
  */

  /* Typografie */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  /* Abstände */
  --space-section: clamp(4.5rem, 10vw, 8rem);
  --container:     72rem;
  --gutter:        clamp(1.25rem, 5vw, 2.5rem);

  --radius:        14px;
  --radius-lg:     20px;

  --header-height: 4.5rem;
}

/* --------------------------------------------------------------------------
   2. Reset / Grundlagen
   -------------------------------------------------------------------------- */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Anker landen nicht unter dem klebenden Header */
  scroll-padding-top: calc(var(--header-height) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  font-weight: 650;
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 1.4rem + 3.4vw, 3.9rem); }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.8vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 1.02rem + 0.4vw, 1.3rem); }

p { margin: 0 0 1.1em; text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { color: var(--accent-strong); }

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

ul { margin: 0 0 1.1em; padding-left: 1.25rem; }
li { margin-bottom: 0.4em; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--accent);
  color: #05080d;
}

/* --------------------------------------------------------------------------
   3. Layout-Helfer
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--space-section);
  border-top: 1px solid var(--border);
}

.section--plain { border-top: 0; }

.section__head {
  max-width: 46rem;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}

.section__head p {
  color: var(--text-muted);
  font-size: 1.075em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow::before {
  content: "";
  width: 1.75rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--accent);
  color: #05080d;
  font-weight: 600;
  border-radius: 0 0 var(--radius) var(--radius);
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; color: #05080d; }

/* --------------------------------------------------------------------------
   4. Wortmarke
   -------------------------------------------------------------------------- */

.wordmark {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.wordmark__bracket { color: var(--accent); }

a.wordmark:hover { color: var(--text); }

/* --------------------------------------------------------------------------
   5. Header & Navigation
   -------------------------------------------------------------------------- */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
}

/* Hintergrund und Weichzeichner liegen bewusst auf einem Pseudo-Element:
   ein backdrop-filter direkt auf .header würde für das position:fixed-Overlay
   des Mobilmenüs einen neuen Containing Block erzeugen – das Menü wäre dann
   nur so hoch wie der Header. */
.header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(11, 14, 19, 0.72);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}

@supports (backdrop-filter: blur(1px)) {
  .header::before { backdrop-filter: saturate(140%) blur(12px); }
}

.header.is-stuck::before {
  background: rgba(11, 14, 19, 0.92);
  border-bottom-color: var(--border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__list li { margin: 0; }

.nav__link {
  display: block;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav__link:hover {
  color: var(--text);
  background: var(--bg-elevated);
}

.nav__link.is-active {
  color: var(--accent);
  background: var(--accent-dim);
}

.nav__cta {
  margin-left: 0.5rem;
}

/* Burger-Button – nur mobil sichtbar */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle__bars::before { transform: translateY(-6px); }
.nav-toggle__bars::after  { transform: translateY(4px); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { transform: rotate(-45deg) translateY(0); }

@media (max-width: 800px) {
  /* Overlay-Menü nur, wenn JavaScript es auch öffnen kann */
  .js .nav-toggle { display: inline-flex; }

  .js .nav {
    position: fixed;
    inset: var(--header-height) 0 0;
    background: var(--bg);
    padding: 1.5rem var(--gutter) 3rem;
    overflow-y: auto;
    display: none;
  }

  .js .nav.is-open { display: block; }

  .js .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .js .nav__link {
    padding: 0.9rem 1rem;
    border-radius: var(--radius);
    font-size: 1.1rem;
  }

  .js .nav__cta {
    margin: 1rem 0 0;
    display: block;
    text-align: center;
  }

  /* Ohne JavaScript: Navigation bleibt als horizontal scrollbare Leiste
     nutzbar, statt hinter einem toten Burger-Button zu verschwinden. */
  html:not(.js) .nav {
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  html:not(.js) .nav__list { flex-wrap: nowrap; }
  html:not(.js) .nav__link { white-space: nowrap; }
}

/* --------------------------------------------------------------------------
   6. Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.75rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: 0.975rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease,
              border-color 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--accent);
  color: #05080d;
  box-shadow: 0 8px 24px -12px var(--accent-glow);
}
.btn--primary:hover {
  background: var(--accent-strong);
  color: #05080d;
  box-shadow: 0 12px 28px -12px var(--accent-glow);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn--small {
  min-height: 2.4rem;
  padding: 0.45rem 1rem;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   7. Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  padding-block: clamp(4rem, 9vw, 7.5rem) clamp(4rem, 8vw, 6.5rem);
  overflow: hidden;
}

/* Dezenter Lichtschein + Raster im Hintergrund, rein dekorativ */
.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto;
  height: 70vh;
  background: radial-gradient(50% 50% at 50% 40%, var(--accent-glow), transparent 70%);
  opacity: 0.5;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.25;
  mask-image: radial-gradient(70% 60% at 50% 30%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000, transparent 75%);
  pointer-events: none;
}

.hero > .container { position: relative; z-index: 1; }

.hero__text { max-width: 44rem; }

.hero__lead {
  font-size: clamp(1.075rem, 1rem + 0.5vw, 1.3rem);
  color: var(--text-muted);
  max-width: 40rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  list-style: none;
  padding-left: 0;
}

.hero__meta li { margin: 0; }

/* --------------------------------------------------------------------------
   8. Karten-Raster
   -------------------------------------------------------------------------- */

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
}

/* Leistungen: bewusst zwei Spalten statt vier – bei vier Karten ergäbe
   auto-fit sonst ein unruhiges 3+1-Raster. */
.grid--duo {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--duo { grid-template-columns: repeat(2, 1fr); }
}

.card {
  padding: clamp(1.5rem, 3vw, 2rem);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.card h3 { margin-bottom: 0.4rem; }

.card p {
  color: var(--text-muted);
  font-size: 0.975rem;
  margin-bottom: 0;
}

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-bottom: 1.1rem;
  border-radius: 12px;
  background: var(--accent-dim);
  color: var(--accent);
}

.card__icon svg { width: 1.4rem; height: 1.4rem; }

/* Arbeitsweise: nummerierte, randlose Variante */
.approach {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.approach li { margin: 0; }

.approach__num {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.approach h3 { margin-bottom: 0.35rem; }

.approach p {
  color: var(--text-muted);
  font-size: 0.975rem;
  margin: 0;
}

/* --------------------------------------------------------------------------
   9. Referenzen
   -------------------------------------------------------------------------- */

.refs {
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 640px) {
  .refs { grid-template-columns: repeat(2, 1fr); }
}

/* Die Trennlinien zeichnet jede Zelle selbst (1px-Ring, der sich im 1px-Gap
   mit dem Nachbarn überlagert). Anders als eine eingefärbte Rasterfläche
   bleibt so bei ungerader Anzahl keine leere Zelle als heller Block stehen. */
.refs li {
  margin: 0;
  background: var(--bg-subtle);
  box-shadow: 0 0 0 1px var(--border);
  transition: background 0.2s ease;
}

.refs li:hover { background: var(--bg-elevated); }

/* Innenabstand sitzt auf .refs__inner, damit verlinkte Einträge in der
   ganzen Zelle anklickbar sind – auf dem Handy ein großzügiges Tap-Ziel. */
.refs__inner {
  display: block;
  padding: 1.4rem clamp(1.25rem, 3vw, 1.75rem);
}

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

a.refs__inner:hover .refs__name {
  color: var(--accent);
}

/* Pfeil-Symbol hinter verlinkten Namen */
.refs__ext {
  width: 0.7em;
  height: 0.7em;
  margin-left: 0.4em;
  vertical-align: baseline;
  color: var(--accent);
  display: inline-block;
}

.refs__name {
  display: block;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.refs__what {
  display: block;
  color: var(--text-muted);
  font-size: 0.925rem;
}

.refs__note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   10. Über uns
   -------------------------------------------------------------------------- */

/* Hebt die Buchstaben hervor, aus denen sich „sp[it]" zusammensetzt */
.acr {
  color: var(--accent);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   11. Kontakt
   -------------------------------------------------------------------------- */

.contact {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  align-items: start;
  padding: clamp(1.75rem, 4vw, 3rem);
  background:
    linear-gradient(160deg, var(--accent-dim), transparent 55%),
    var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.contact h2 { margin-bottom: 0.5rem; }

.contact p { color: var(--text-muted); }

.contact__mail {
  display: inline-block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 0.9rem + 0.8vw, 1.5rem);
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  word-break: break-word;
}

.contact__mail:hover { text-decoration: underline; }

.contact__address {
  font-style: normal;
  color: var(--text-muted);
  line-height: 1.8;
}

.contact__label {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.8;
}

.contact__block + .contact__block { margin-top: 1.75rem; }

/* --------------------------------------------------------------------------
   12. Footer
   -------------------------------------------------------------------------- */

.footer {
  border-top: 1px solid var(--border);
  padding-block: 2.5rem 3rem;
  font-size: 0.925rem;
  color: var(--text-muted);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__links li { margin: 0; }

.footer__links a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer__links a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   13. Rechtstexte / Unterseiten
   -------------------------------------------------------------------------- */

.page {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.prose {
  max-width: 44rem;
}

.prose h2 {
  margin-top: 2.75rem;
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.6rem);
}

.prose h2:first-of-type { margin-top: 2rem; }

.prose h3 {
  margin-top: 1.75rem;
  font-size: 1.05rem;
}

.prose p,
.prose li { color: var(--text-muted); }

.prose strong { color: var(--text); font-weight: 600; }

.prose address {
  font-style: normal;
  line-height: 1.9;
  color: var(--text-muted);
  margin-bottom: 1.1em;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  font-size: 0.925rem;
  text-decoration: none;
}

.back-link:hover { text-decoration: underline; }

/* Fehlerseite */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: 60vh;
  padding-block: 4rem;
}

.error-page__code {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 10vw, 5rem);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1rem;
}

/* --------------------------------------------------------------------------
   14. Animation (per JS aktiviert, siehe script.js)
   -------------------------------------------------------------------------- */

.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js .reveal { opacity: 1; transform: none; }
  .btn:hover, .card:hover { transform: none; }
}

/* Druckausgabe – u. a. damit das Impressum sauber auf Papier landet */
@media print {
  :root { --bg: #fff; --text: #000; --text-muted: #333; }
  body { background: #fff; color: #000; }
  .header, .footer__links, .hero::before, .hero::after, .nav-toggle { display: none; }
  .card, .contact, .refs { border-color: #ccc; background: #fff; }
  a { color: #000; }
}