:root{
  --bg: #0B0F12;
  --bg-rgb: 11,15,18;
  --panel: #12181C;
  --panel-2: #161E22;
  --border: #212B30;
  --border-bright: #2C3940;
  --text: #F2F0EA;
  --text-dim: #9FB0B8;
  --text-faint: #7C8790;
  --accent: #2FD3D9;
  --accent-2: #8FA0AC;
  --accent-dim: #2FD3D933;
  --amber: #8FA0AC;
  --amber-dim: #8FA0AC33;
  --brand-gradient: linear-gradient(135deg, #2FD3D9, #6E8791);
  --radius: 10px;
  --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

html[data-theme="light"]{
  --bg: #F5F6F7;
  --bg-rgb: 245,246,247;
  --panel: #FFFFFF;
  --panel-2: #F0F2F3;
  --border: #E1E5E7;
  --border-bright: #CDD3D6;
  --text: #12181C;
  --text-dim: #4A565E;
  --text-faint: #657077;
  --accent: #127D82;
  --accent-2: #5C6B74;
  --accent-dim: #127D8233;
  --amber: #5C6B74;
  --amber-dim: #5C6B7433;
  --brand-gradient: linear-gradient(135deg, #127D82, #5C6B74);
}
html[data-theme="light"] .grid-bg{ opacity:0.5; }

*{ margin:0; padding:0; box-sizing:border-box; }

html{ scroll-behavior:smooth; }

html, body{
  max-width:100%;
  overflow-x:hidden;
}

body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
}

h1,h2,h3,h4{ font-family:var(--font-display); font-weight:600; letter-spacing:-0.01em; }
.mono{ font-family:var(--font-mono); }

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

.wrap{ max-width:1180px; margin:0 auto; padding:0 32px; }
@media (max-width:600px){ .wrap{ padding:0 24px; } }

/* Skip to content link (visible on keyboard focus only) */
.skip-link{
  position:absolute; left:16px; top:-60px; z-index:1000;
  background:var(--accent); color:#06121F; font-family:var(--font-mono); font-size:0.85rem;
  padding:10px 18px; border-radius:6px; transition:top .2s ease;
}
.skip-link:focus{ top:16px; }

/* Background grid texture */
.grid-bg{
  position:fixed; top:-64px; left:-64px; right:-64px; bottom:-64px; z-index:0; pointer-events:none;
  background-image:
    linear-gradient(var(--border-bright) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-bright) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity:0.25;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 8%, black 40%, transparent 100%);
  animation: grid-drift 50s linear infinite;
  will-change: transform;
}
@keyframes grid-drift{
  from{ transform: translate3d(0, 0, 0); }
  to{ transform: translate3d(64px, 64px, 0); }
}

/* NAV */
header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  background:rgba(var(--bg-rgb), 0.75);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
nav{ display:flex; align-items:center; justify-content:center; flex-wrap:wrap; row-gap:12px; padding:16px 24px; max-width:1180px; margin:0 auto; }
.logo{ display:flex; align-items:center; }
.logo-img{ height:38px; width:auto; display:block; }
.logo-img.logo-light{ display:none; }
html[data-theme="light"] .logo-img.logo-dark{ display:none; }
html[data-theme="light"] .logo-img.logo-light{ display:block; }
.logo-img.logo-img--footer{ height:30px; opacity:0.75; }
.nav-links{ display:flex; align-items:center; gap:22px; font-size:0.82rem; color:var(--text-dim); flex-wrap:wrap; order:3; width:100%; justify-content:center; }
.nav-links a{ transition:color .2s; }
.nav-links a:hover, .nav-links a:focus-visible{ color:var(--text); }
.nav-links a.active{ color:var(--text); font-weight:600; }

.theme-toggle{
  all:unset; cursor:pointer; display:flex; align-items:center; justify-content:center;
  position:fixed; left:8px; bottom:90px; z-index:150;
  width:48px; height:48px; border-radius:50%;
  background:var(--panel); border:1px solid var(--border-bright);
  color:var(--text-dim); box-shadow:0 8px 24px -8px rgba(0,0,0,0.35);
  transition:border-color .2s, color .2s, transform .25s ease, box-shadow .25s ease;
}
.theme-toggle:hover, .theme-toggle:focus-visible{ border-color:var(--accent); color:var(--accent); transform:translateY(-3px); }
.theme-toggle svg{ width:20px; height:20px; display:block; }
.theme-toggle .icon-moon{ display:none; }
html[data-theme="light"] .theme-toggle .icon-sun{ display:none; }
html[data-theme="light"] .theme-toggle .icon-moon{ display:block; }

.lang-toggle{
  all:unset; cursor:pointer; display:inline-flex; align-items:center; gap:4px;
  color:var(--text-dim); font-family:inherit; font-size:0.9rem;
  transition:color .2s;
}
.lang-toggle:hover, .lang-toggle:focus-visible{ color:var(--text); }
.lang-toggle .lang-sep{ color:var(--text-faint); }
.lang-toggle .lang-de, .lang-toggle .lang-en{ transition:color .2s; }
.lang-toggle .lang-de{ color:var(--accent); }
html[data-lang="en"] .lang-toggle .lang-de{ color:var(--text-faint); }
html[data-lang="en"] .lang-toggle .lang-en{ color:var(--accent); }

@media (min-width:821px){
  nav{ flex-wrap:nowrap; row-gap:0; padding:18px 32px; justify-content:space-between; }
  .logo-img{ height:56px; }
  .nav-links{ margin-left:auto; gap:32px; font-size:0.92rem; width:auto; justify-content:flex-start; }
}

/* Eyebrow label (used throughout) */
.eyebrow{
  font-family:var(--font-mono); font-size:0.78rem; letter-spacing:0.12em;
  color:var(--accent-2); text-transform:uppercase; display:flex; align-items:center; gap:10px; margin-bottom:22px;
}
.eyebrow::before{ content:''; width:22px; height:1px; background:var(--accent-2); }

/* Buttons */
.btn{
  padding:13px 26px; border-radius:6px; font-size:0.95rem; font-weight:500; transition:all .2s;
  display:inline-flex; align-items:center; gap:8px;
}
button.btn{
  appearance:none; -webkit-appearance:none; border:none;
  font-family:inherit; cursor:pointer;
}
.btn-primary{ background:var(--brand-gradient); color:#F8FAFF; }
.btn-primary:hover, .btn-primary:focus-visible{ filter:brightness(1.12); transform:translateY(-1px); }
.btn-ghost{ border:1px solid var(--border-bright); color:var(--text); }
button.btn-ghost{ border:1px solid var(--border-bright); }
.btn-ghost:hover, .btn-ghost:focus-visible{ border-color:var(--text-dim); }

/* Shared section rhythm */
section.wrap{ position:relative; z-index:1; padding-top:90px; padding-bottom:90px; }
.section-head{ max-width:640px; margin-bottom:48px; }
.section-head .eyebrow{ margin-bottom:18px; }
.section-head h2{ font-size:clamp(1.7rem, 3.2vw, 2.4rem); margin-bottom:18px; }
.section-head p{ color:var(--text-dim); font-size:1.02rem; }

.reveal{ opacity:0; transform:translateY(28px); transition:opacity .7s ease, transform .7s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }

/* Footer */
footer.wrap{ position:relative; z-index:1; border-top:1px solid var(--border); padding-top:48px; padding-bottom:32px; }
.footer-grid{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:24px; margin-bottom:32px; }
@media (max-width:600px){
  .footer-grid{ flex-direction:column; align-items:center; justify-content:center; text-align:center; }
}
.footer-links{ display:flex; align-items:center; gap:24px; color:var(--text-dim); font-size:0.9rem; flex-wrap:wrap; justify-content:center; }
.footer-links a:hover{ color:var(--text); }
.footer-bottom{ color:var(--text-faint); font-size:0.82rem; font-family:var(--font-mono); }

.ai-summarize{
  display:flex; align-items:center; justify-content:center; flex-wrap:wrap; gap:10px;
  padding:40px 32px 0;
}
.ai-summarize-label{ font-size:0.78rem; color:var(--text-faint); font-family:var(--font-mono); margin-right:2px; }
.ai-summarize-btn{
  display:inline-flex; align-items:center; padding:9px 18px; border-radius:6px;
  background:var(--brand-gradient); font-size:0.82rem; font-weight:500; color:#F8FAFF;
  transition:filter .2s, transform .2s;
}
.ai-summarize-btn:hover, .ai-summarize-btn:focus-visible{ filter:brightness(1.12); transform:translateY(-1px); }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; scroll-behavior:auto !important; }
}

/* WhatsApp floating button */
.whatsapp-fab{
  position:fixed; right:20px; bottom:20px; z-index:150;
  width:56px; height:56px; border-radius:50%;
  background:var(--brand-gradient);
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 8px 24px -8px rgba(47,211,217,0.5);
  transition:transform .25s ease, box-shadow .25s ease;
}
.whatsapp-fab:hover, .whatsapp-fab:focus-visible{
  transform:translateY(-3px) scale(1.05);
  box-shadow:0 12px 28px -8px rgba(143,160,172,0.5);
}
.whatsapp-fab svg{ width:28px; height:28px; }