:root {
  color-scheme: dark;
  --bg0: #0f172a;
  --bg1: #1e293b;
  --bg2: #243447;
  --bg3: #2d3f55;
  --tx0: #f1f5f9;
  --tx1: #cbd5e1;
  --tx2: #94a3b8;
  --tx3: #64748b;
  --brd: #334155;
  --acc: #2563eb;
  --acc2: #1d4ed8;
  --acc-glow: rgba(37, 99, 235, 0.35);
  --ok: #22c55e;
  --warn: #eab308;
  --bad: #f97316;
  --r-s: 8px;
  --r-m: 12px;
  --r-l: 16px;
  --r-xl: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--bg0);
  background-image: radial-gradient(circle at 15% -10%, rgba(37, 99, 235, 0.22), transparent 45%),
    radial-gradient(circle at 100% 0%, rgba(37, 99, 235, 0.12), transparent 40%);
  color: var(--tx0);
}

.page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0;
}

nav.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 56px;
}

nav.topbar img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

nav.topbar span {
  font-weight: 800;
  font-size: 1.05rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 48px;
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: 22px;
}

.eyebrow {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #93c5fd;
  background: rgba(37, 99, 235, 0.14);
  border: 1px solid rgba(37, 99, 235, 0.3);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  width: fit-content;
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.lead {
  max-width: 540px;
  margin: 0;
  color: var(--tx2);
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  line-height: 1.6;
}

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

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 20px;
  border-radius: var(--r-m);
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.96rem;
  text-decoration: none;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.primary {
  background: var(--acc);
  color: #fff;
  box-shadow: 0 14px 28px var(--acc-glow);
}

.primary:hover {
  background: var(--acc2);
}

.secondary {
  background: var(--bg1);
  border-color: var(--brd);
  color: var(--tx0);
}

.secondary:hover {
  border-color: var(--acc);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--tx3);
  font-size: 0.85rem;
}

.meta-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ── App-Vorschau (Mockup, keine echten Nutzerdaten) ── */
.preview {
  border: 1px solid var(--brd);
  border-radius: var(--r-l);
  background: var(--bg1);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.preview-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--brd);
  background: var(--bg2);
}

.preview-bar b {
  font-size: 0.85rem;
  font-weight: 700;
}

.preview-bar small {
  color: var(--tx3);
  font-size: 0.72rem;
}

.preview-body {
  padding: 16px;
  display: grid;
  gap: 10px;
}

.mock-subject {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg2);
  border: 1px solid var(--brd);
  border-radius: var(--r-m);
  padding: 10px 12px;
}

.mock-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mock-subject .name {
  flex: 1;
  font-size: 0.86rem;
  font-weight: 600;
}

.mock-subject .grade {
  font-size: 0.86rem;
  font-weight: 800;
  border-radius: var(--r-s);
  padding: 2px 9px;
}

.g-ok {
  color: var(--ok);
  background: rgba(34, 197, 94, 0.12);
}

.g-warn {
  color: var(--warn);
  background: rgba(234, 179, 8, 0.12);
}

.g-bad {
  color: var(--bad);
  background: rgba(249, 115, 22, 0.12);
}

.mock-nav {
  display: flex;
  justify-content: space-between;
  padding: 10px 14px;
  border-top: 1px solid var(--brd);
  background: var(--bg2);
}

.mock-nav span {
  font-size: 0.68rem;
  color: var(--tx3);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.mock-nav span.on {
  color: var(--acc);
}

.mock-nav .ico {
  width: 16px;
  height: 16px;
  border-radius: 5px;
  background: currentColor;
  opacity: 0.85;
}

/* ── Features ── */
.section-title {
  margin: 0 0 6px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
}

.section-sub {
  margin: 0 0 28px;
  color: var(--tx2);
  max-width: 600px;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.feature {
  background: var(--bg1);
  border: 1px solid var(--brd);
  border-radius: var(--r-m);
  padding: 20px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.feature .icon {
  width: 38px;
  height: 38px;
  border-radius: var(--r-s);
  background: var(--acc-glow);
  color: var(--acc);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
}

.feature strong {
  font-size: 0.98rem;
}

.feature span {
  color: var(--tx2);
  font-size: 0.88rem;
  line-height: 1.5;
}

/* ── Install Steps ── */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.steps article {
  border: 1px solid var(--brd);
  background: var(--bg1);
  border-radius: var(--r-m);
  padding: 18px;
  display: grid;
  gap: 8px;
  align-content: start;
  position: relative;
}

.steps article .num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--acc);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps strong {
  font-size: 0.96rem;
}

.steps span {
  color: var(--tx2);
  line-height: 1.5;
  font-size: 0.9rem;
}

footer {
  margin-top: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--brd);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  color: var(--tx3);
  font-size: 0.85rem;
}

footer a {
  color: var(--tx2);
  text-decoration: none;
}

footer a:hover {
  color: var(--tx0);
}

section + section {
  margin-top: 64px;
}

@media (max-width: 860px) {
  .features {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .page {
    width: min(100% - 24px, 1120px);
    padding: 32px 0;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
  }
}