:root {
  /* domyślne - jasne */
  /* LIGHT */
  --bg: #ffffff;
  --surface: #f2f2f2;

  --text-primary: #2e2e2e;
  --text-secondary: #4e4e4e;
  --text-third: #6e6e6e;

  --border: #d9d9d9;
  --accent: #9f4ed4;
  --accent-soft: #f3e8ff;

  --success: #4bb543;
  --error: #ff3b30;

  --growth: #4caf50;
  --stable: #ffb300;
  --decrease: #e53935;
  --max-width: 920px;
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --surface: #1e1e1e;

    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-third: #8d8d8d;

    --border: #333333;
    --accent: #9f4ed4;
    --accent-soft: #2a1838;

    --success: #4bb543;
    --info: #267ce9;
    --error: #ff3b30;

    --growth: #4caf50;
    --stable: #ffb300;
    --decrease: #e53935;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.65;
}

a {
  color: var(--accent);
}

.container {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
}

.hero {
  padding: 48px 0 24px;
}

.badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.1;
}

.lead {
  max-width: 720px;
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

.meta {
  margin-top: 18px;
  color: var(--text-secondary);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 32px;
  padding: 12px 0 56px;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 24px;
}

.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.sidebar-title {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar li + li {
  margin-top: 10px;
}

.sidebar a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
}

.content {
  min-width: 0;
}

.section {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

.section:first-child {
  border-top: 0;
  padding-top: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.2;
}

p {
  margin: 0 0 14px;
}

ul {
  margin: 0 0 16px 20px;
  padding: 0;
}

li {
  margin: 6px 0;
}

.note {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 14px;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  color: var(--text-secondary);
  font-size: 14px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 32px 0 8px;
  }

  .topbar-inner {
    padding: 12px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    gap: 10px 14px;
  }

  h1 {
    font-size: 34px;
  }
}