:root {
  color-scheme: light dark;
  --bg: #0d1420;
  --bg-elevated: rgba(20, 31, 47, 0.94);
  --bg-soft: rgba(28, 41, 60, 0.9);
  --text: #eef3fb;
  --muted: #a7b7ca;
  --line: rgba(186, 203, 224, 0.16);
  --accent: #5ea0ff;
  --accent-strong: #2d7dff;
  --button-text: #f5f8ff;
  --hero-glow: radial-gradient(circle at top left, rgba(94, 160, 255, 0.18), transparent 45%);
  --shadow: 0 24px 60px rgba(2, 8, 23, 0.25);
  --mono-bg: rgba(18, 26, 39, 0.96);
}

body[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-elevated: rgba(255, 255, 255, 0.92);
  --bg-soft: rgba(245, 248, 252, 0.96);
  --text: #162233;
  --muted: #5f7086;
  --line: rgba(28, 44, 67, 0.12);
  --accent: #2568dd;
  --accent-strong: #0f58dd;
  --button-text: #ffffff;
  --hero-glow: radial-gradient(circle at top left, rgba(37, 104, 221, 0.12), transparent 45%);
  --shadow: 0 24px 60px rgba(25, 40, 66, 0.12);
  --mono-bg: rgba(241, 245, 251, 0.96);
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    var(--hero-glow),
    var(--bg);
  color: var(--text);
}

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

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  gap: 1.25rem;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(8, 14, 24, 0.76);
  backdrop-filter: blur(20px);
}

body[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.8);
}

.brand {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.brand-subtitle {
  margin: 0.15rem 0 0;
  color: var(--muted);
}

.top-nav {
  display: flex;
  gap: 1rem;
  color: var(--muted);
}

.header-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.top-nav a:hover {
  color: var(--text);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-soft);
}

.lang-switch a {
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
}

.lang-switch a.active {
  background: var(--accent-strong);
  color: var(--button-text);
}

.theme-control {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.theme-control select {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text);
  padding: 0.35rem 0.8rem;
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero {
  padding: 2rem 0 2.5rem;
}

.hero.compact {
  padding-bottom: 1.5rem;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
}

.hero h1 {
  margin: 0;
  max-width: 14ch;
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.hero-copy {
  max-width: 68ch;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.button.primary {
  background: var(--accent-strong);
  color: var(--button-text);
  border-color: transparent;
}

.button.secondary {
  background: var(--bg-soft);
}

.content-section {
  margin-top: 2.25rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}

.content-section h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  letter-spacing: -0.04em;
}

.content-section p {
  color: var(--muted);
  line-height: 1.75;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  padding: 1rem 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--bg-soft);
}

.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.card p,
.feature-list {
  margin: 0;
  color: var(--muted);
}

.feature-list {
  padding-left: 1.25rem;
  line-height: 1.8;
}

.code-shell {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--mono-bg);
}

.code-shell-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--muted);
}

.copy-button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  cursor: pointer;
}

.copy-button[data-copied="true"] {
  color: var(--button-text);
  background: var(--accent-strong);
  border-color: transparent;
}

.code-shell pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.95rem;
  line-height: 1.65;
}

@media (max-width: 860px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-nav,
  .header-controls {
    flex-wrap: wrap;
  }

  .header-controls {
    width: 100%;
    justify-content: flex-start;
  }
}