/* ============================================
   Bit Control — Stylesheet
   Varela Round (headings) + Open Sans (body)
   Self-hosted fonts, DSGVO-konform
   ============================================ */

/* --- Local Fonts (woff2 — self-hosted, DSGVO-konform) --- */
@font-face {
  font-family: 'Varela Round';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/VarelaRound400.woff2') format('woff2');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  font-stretch: normal;
  font-display: swap;
  src: url('fonts/OpenSans400.woff2') format('woff2');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  font-stretch: normal;
  font-display: swap;
  src: url('fonts/OpenSans600.woff2') format('woff2');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 700;
  font-stretch: normal;
  font-display: swap;
  src: url('fonts/OpenSans700.woff2') format('woff2');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 800;
  font-stretch: normal;
  font-display: swap;
  src: url('fonts/OpenSans800.woff2') format('woff2');
}

/* --- CSS Custom Properties --- */
:root {
  --bg:        #0f1117;
  --bg-card:   #1a1d27;
  --bg-hover:  #22252f;
  --border:    #2a2d3a;
  --text:      #e0e0e0;
  --text-muted:#888;
  --accent:    #4a9eff;
  --accent-h:  #7ab5ff;

  --font-sans: 'Open Sans', system-ui, -apple-system, sans-serif;
  --font-head: 'Varela Round', system-ui, sans-serif;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius:   8px;
  --radius-lg:12px;

  --max-w:    1100px;
  --header-h: 64px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-h); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* --- Layout --- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--space-6); }

/* --- Header --- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,17,23,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); height: var(--header-h); }

/* --- Hamburger Menu (CSS-only, no JS) --- */
#nav-toggle { display: none; }

.nav-toggle-label {
  display: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius);
  transition: background 0.15s;
  z-index: 200;
}
.nav-toggle-label:hover { background: var(--bg-hover); }
.nav-toggle-label span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
  transform-origin: center;
}

#nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo .bit { color: var(--accent); }
.logo .networks { color: var(--text-muted); font-size: inherit; font-weight: inherit; margin-left: 0.15em; }

.site-header nav { display: flex; gap: var(--space-6); }
.site-header nav a { color: var(--text-muted); font-size: 0.9rem; font-weight: 500; transition: color 0.15s; }
.site-header nav a:hover { color: var(--text); }

/* --- Hero --- */
.hero { padding: var(--space-16) 0 var(--space-12); text-align: center; }
.eyebrow {
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--accent); margin-bottom: var(--space-4);
}
.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: var(--space-6);
}
.hero-sub { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--text-muted); max-width: 560px; margin: 0 auto var(--space-8); }
.hero-actions { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: 0.95rem; font-weight: 600;
  border-radius: var(--radius); border: none; cursor: pointer;
  transition: all 0.15s; text-decoration: none;
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-h); color: #000; }
.btn-secondary { background: var(--bg-card); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--text-muted); }

/* --- Section --- */
.section-eyebrow { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: var(--space-3); }

/* --- Leistungen --- */
.leistungen { padding: var(--space-12) 0; border-top: 1px solid var(--border); }
.leistungen h2, .about-text h2, .kontakt h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700; color: #fff; margin-bottom: var(--space-8);
}
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-6); }

/* --- Card --- */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  transition: border-color 0.2s, background 0.2s;
}
.card:hover { border-color: #3a3d4a; background: var(--bg-hover); }
.card-icon { font-size: 1.5rem; color: var(--accent); margin-bottom: var(--space-4); }
.card h3 {
  font-family: var(--font-head);
  font-size: 1.05rem; font-weight: 600; color: #fff; margin-bottom: var(--space-3);
}
.card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; }

/* --- About --- */
.about { padding: var(--space-12) 0; border-top: 1px solid var(--border); }
.about-grid { display: grid; gap: var(--space-12); }
@media (min-width: 768px) { .about-grid { grid-template-columns: 1fr 1fr; align-items: center; } }
.about-text p { color: var(--text-muted); margin-bottom: var(--space-4); font-size: 0.95rem; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.stat { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-6); text-align: center; }
.stat-num { display: block; font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800; color: var(--accent); letter-spacing: -0.03em; }
.stat-label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-top: var(--space-2); }

/* --- Kontakt --- */
.kontakt { padding: var(--space-12) 0 var(--space-16); border-top: 1px solid var(--border); }
.kontakt-grid { display: grid; gap: var(--space-8); }
@media (min-width: 768px) { .kontakt-grid { grid-template-columns: 1fr 1.5fr; } }
.kontakt-info p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: var(--space-6); }
.contact-details { display: flex; flex-direction: column; gap: var(--space-4); }
.contact-item { display: flex; flex-direction: column; gap: var(--space-1); }
.contact-label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); }
.contact-item a { font-size: 1rem; color: var(--text); }
.contact-item a:hover { color: var(--accent); }

/* --- Form --- */
.contact-form { display: flex; flex-direction: column; gap: var(--space-4); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-group label { font-size: 0.85rem; font-weight: 500; color: var(--text-muted); }
.form-group input, .form-group textarea {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: var(--space-3) var(--space-4); color: var(--text);
  font-size: 0.95rem; font-family: inherit;
  transition: border-color 0.15s; resize: vertical;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); outline: none; }
.contact-form .btn { align-self: flex-start; }

/* --- Footer --- */
.site-footer { border-top: 1px solid var(--border); padding: var(--space-8) 0 var(--space-6); }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-6); flex-wrap: wrap; margin-bottom: var(--space-8); }
.footer-brand p { color: var(--text-muted); font-size: 0.85rem; margin-top: var(--space-2); }
.footer-nav { display: flex; gap: var(--space-6); }
.footer-nav a { color: var(--text-muted); font-size: 0.85rem; }
.footer-nav a:hover { color: var(--text); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: var(--space-6); }
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }

/* --- Responsive --- */
@media (max-width: 600px) {
  .nav-toggle-label { display: flex; }
  .site-header nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: rgba(15,17,23,0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4) 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 99;
  }
  #nav-toggle:checked ~ nav {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-header nav a {
    display: block;
    padding: var(--space-3) var(--space-6);
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.15s, background 0.15s;
  }
  .site-header nav a:hover {
    color: var(--text);
    background: var(--bg-hover);
  }
  .stats { grid-template-columns: 1fr; }
  .contact-form .btn { width: 100%; }
}

/* --- Accordion (CSS-only, no JS) --- */
details.accordion {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
  overflow: hidden;
}
details.accordion summary {
  padding: var(--space-4) var(--space-6);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s;
}
details.accordion summary::-webkit-details-marker { display: none; }
details.accordion summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--accent);
  transition: transform 0.2s;
}
details.accordion[open] summary::after { transform: rotate(45deg); }
details.accordion summary:hover { background: var(--bg-hover); }
.accordion-content {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.accordion-content ul { margin: var(--space-4) 0 var(--space-4) var(--space-6); }
.accordion-content li { margin-bottom: var(--space-2); }
.accordion-content strong { color: var(--text); }

/* --- Automation Loop --- */
.loop-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: center;
  overflow-x: auto;
  padding-bottom: var(--space-4);
}
.loop-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  min-width: 160px;
}
.loop-num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}
.loop-step h3 {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-2);
}
.loop-step p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.loop-arrow {
  color: var(--accent);
  font-size: 1.2rem;
  text-align: center;
  padding: 0 var(--space-2);
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .loop-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .loop-arrow { display: none; }
}
@media print {
  .site-header, .site-footer, .hero-actions, .contact-form { display: none; }
  body { background: #fff; color: #000; }
  .hero h1 { font-size: 1.8rem; color: #000; }
  .card { border: 1px solid #ccc; background: #fff; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }