:root{
  --max: 860px;
  --pad: 22px;

  --radius: 16px;
  --radius-sm: 12px;

  --border: rgba(17,17,17,0.10);
  --muted: rgba(17,17,17,0.62);
  --muted2: rgba(17,17,17,0.45);

  --bg: #ffffff;
  --panel: rgba(17,17,17,0.03);
  --panel2: rgba(17,17,17,0.06);

  --ink: #111111;
  --ink2: rgba(17,17,17,0.86);

  --accent: #1f5fff;        /* blue */
  --accent2: #00c2ff;       /* cyan */
  --good: #0a7b3b;
  --warn: #b54708;

  --shadow: 0 10px 30px rgba(17,17,17,0.08);
}

*{ box-sizing: border-box; }
html{ -webkit-text-size-adjust: 100%; }
body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

a{ color: inherit; text-underline-offset: 3px; }
a:hover{ text-decoration-thickness: 2px; }

.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.header{
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.88);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.brand{
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark{
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 6px 18px rgba(31,95,255,0.25);
}
.nav{
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: var(--muted);
}
.nav a{ text-decoration: none; padding: 6px 8px; border-radius: 10px; }
.nav a:hover{ background: var(--panel); text-decoration: none; }

main{
  max-width: var(--max);
  margin: 0 auto;
  padding: 26px var(--pad) 44px;
}

h1{
  font-size: clamp(2.0rem, 4vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin: 0 0 12px;
}
h2{
  font-size: 1.25rem;
  margin: 26px 0 10px;
  letter-spacing: -0.01em;
}
h3{
  font-size: 1.05rem;
  margin: 18px 0 8px;
  letter-spacing: -0.01em;
}
p{ margin: 0 0 14px; color: var(--ink2); }

.lede{
  font-size: 1.08rem;
  color: var(--ink2);
  margin-bottom: 18px;
  max-width: 62ch;
}

.hero{
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px 18px 16px;
  background:
    radial-gradient(1200px 380px at 20% 0%, rgba(31,95,255,0.14), transparent 60%),
    radial-gradient(900px 360px at 90% 20%, rgba(0,194,255,0.10), transparent 55%),
    var(--panel);
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}
.hero-top{
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font-weight: 650;
}
.btn:hover{ box-shadow: 0 10px 26px rgba(17,17,17,0.10); }
.btn.primary{
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border-color: transparent;
}
.btn.primary:hover{ filter: brightness(0.98); }

.pills{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.pill{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.7);
}

.grid{
  display: grid;
  gap: 12px;
}
.grid.two{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 820px){
  .grid.two, .grid.three{ grid-template-columns: 1fr; }
}

.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 14px 12px;
  background: #fff;
  margin: 14px 0;
}
.card.soft{
  background: var(--panel);
}
.card h2{ margin-top: 0; }

.answer{
  border-left: 4px solid rgba(31,95,255,0.9);
  padding-left: 12px;
  background: linear-gradient(90deg, rgba(31,95,255,0.08), transparent 60%);
}

.meta{
  font-size: 0.92rem;
  color: var(--muted);
}

ul, ol{ padding-left: 18px; }
li{ margin: 7px 0; color: var(--ink2); }

kbd{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9em;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 10px;
  background: rgba(255,255,255,0.85);
}

.breadcrumb{
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 10px;
}
.breadcrumb a{
  color: var(--muted);
  text-decoration: none;
}
.breadcrumb a:hover{ text-decoration: underline; }

.callout{
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: var(--radius);
  padding: 12px 12px 10px;
  margin: 16px 0;
}
.callout strong{ color: var(--ink); }

.kpi{
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}
.kpi .k{ font-size: 0.88rem; color: var(--muted); }
.kpi .v{ font-weight: 800; letter-spacing: -0.02em; }

.page-layout{
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 18px;
}
@media (max-width: 980px){
  .page-layout{ grid-template-columns: 1fr; }
}
.toc{
  position: sticky;
  top: 74px;
  align-self: start;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(10px);
  padding: 12px 12px 10px;
}
.toc .title{
  font-weight: 750;
  margin-bottom: 8px;
}
.toc a{
  display: block;
  padding: 6px 8px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--muted);
}
.toc a:hover{ background: var(--panel); color: var(--ink); }

.footer{
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-inner{
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px var(--pad) 28px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* Language switch (EN / DE / ES) */
.lang-switch{
  display: inline-flex;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.7);
}

.lang-switch a{
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
}

.lang-switch a[aria-current="true"]{
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: 1px solid transparent;
}

.lang-switch a:hover{
  background: var(--panel);
  color: var(--ink);
}