:root {
  --ink: #172027;
  --muted: #51616c;
  --paper: #f3f7f5;
  --panel: #ffffff;
  --line: #cbd8d4;
  --accent: #007f72;
  --accent-2: #c13d32;
  --shadow: 0 18px 45px rgba(23, 32, 39, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 5%, rgba(0, 127, 114, 0.14), transparent 28rem),
    radial-gradient(circle at 90% 20%, rgba(193, 61, 50, 0.10), transparent 24rem),
    var(--paper);
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  line-height: 1.55;
}

[data-lang] {
  display: none;
}

body.lang-de [data-lang="de"],
body.lang-en [data-lang="en"] {
  display: block;
}

.hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  padding: 28px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.logo {
  width: 84px;
  height: 84px;
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 4px;
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: -0.03em;
}

.lead,
.card p,
.note {
  color: var(--muted);
}

.note {
  border-left: 5px solid var(--accent-2);
  border-radius: 12px;
  padding: 14px 16px;
  background: rgba(193, 61, 50, 0.08);
}

.language-switch {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

button,
.download {
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 9px 14px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.download.secondary,
.language-switch button {
  background: #fff;
  color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 980px);
  gap: 28px;
  align-items: start;
  width: min(1280px, calc(100% - 32px));
  margin: 30px 0 56px clamp(16px, 4vw, 64px);
}

.sidebar {
  position: sticky;
  top: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.nav-toggle {
  width: 100%;
  margin-bottom: 10px;
}

.sidebar nav a {
  display: block;
  padding: 9px 10px;
  border-radius: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
}

.sidebar nav a:hover,
.sidebar nav a:focus {
  background: rgba(0, 127, 114, 0.10);
}

body.nav-collapsed .sidebar nav {
  display: none;
}

main {
  min-width: 0;
}

.card {
  max-width: 980px;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(22px, 4vw, 40px);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 22px 0;
}

code,
pre {
  font-family: "Cascadia Mono", Consolas, monospace;
}

code {
  border-radius: 5px;
  padding: 2px 5px;
  background: rgba(0, 127, 114, 0.10);
}

a {
  color: var(--accent);
  font-weight: 700;
}

footer {
  padding: 26px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
}

footer p {
  margin-bottom: 6px;
}

@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .language-switch {
    justify-content: flex-start;
  }

  .layout {
    grid-template-columns: 1fr;
    margin-left: 16px;
  }

  .sidebar {
    position: relative;
    top: 0;
  }
}