:root {
  --bg: #0a0a0a;
  --bg-elevated: rgba(255, 255, 255, 0.04);
  --bg-sidebar: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --text: #f4f7fb;
  --text-muted: #9aa5b1;
  --primary: #0a84ff;
  --primary-soft: rgba(10, 132, 255, 0.15);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --content-width: 860px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(circle at top, rgba(10, 132, 255, 0.16), transparent 30%),
    linear-gradient(180deg, #0c0c0c 0%, #090909 100%);
  color: var(--text);
  min-height: 100vh;
}

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

img {
  max-width: 100%;
  display: block;
}

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 20px;
  border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 30px;
}

.brand img {
  width: 36px;
  height: 36px;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
}

.brand-subtitle {
  color: var(--text-muted);
  font-size: 13px;
}

.nav-title {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  margin-bottom: 12px;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: 160ms ease;
  border: 1px solid transparent;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--bg-elevated);
  border-color: var(--border);
}

.sidebar-footer {
  margin-top: 28px;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  border-radius: 999px;
  background: linear-gradient(135deg, #1493ff 0%, #0a84ff 100%);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 16px 30px rgba(10, 132, 255, 0.28);
}

.mobile-topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 20;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  background: rgba(10, 10, 10, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.menu-button {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
}

.content {
  min-width: 0;
}

.content-shell {
  width: min(100%, calc(var(--content-width) + 96px));
  margin: 0 auto;
  padding: 48px;
}

.hero-card {
  position: relative;
  overflow: hidden;
  margin-bottom: 26px;
  padding: 30px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.025));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -60px -80px auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(10, 132, 255, 0.12);
  filter: blur(10px);
}

.eyebrow {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: #8cc4ff;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-title {
  margin: 18px 0 10px;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.04;
}

.hero-text {
  margin: 0;
  max-width: 640px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.7;
}

.article-card {
  padding: 34px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.025);
  box-shadow: var(--shadow);
}

.doc-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.doc-content p {
  margin: 0 0 16px;
}

.doc-content ol {
  margin: 0 0 18px 0;
  padding-left: 24px;
}

.doc-content li {
  margin-bottom: 10px;
  padding-left: 6px;
}

.doc-content strong {
  font-weight: 700;
  color: #ffffff;
}

.doc-content a {
  color: #7ec0ff;
  text-decoration: underline;
  text-decoration-color: rgba(126, 192, 255, 0.45);
  text-underline-offset: 3px;
}

.doc-content code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
}

.overlay {
  display: none;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(86vw, 320px);
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 180ms ease;
  }

  body.menu-open .sidebar {
    transform: translateX(0);
  }

  .mobile-topbar {
    display: flex;
  }

  .content-shell {
    padding: 24px 18px 40px;
  }

  .hero-card {
    padding: 22px;
  }

  .article-card {
    padding: 22px;
  }

  .overlay {
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(0, 0, 0, 0.55);
  }

  body.menu-open .overlay {
    display: block;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 30px;
  }

  .hero-text,
  .doc-content {
    font-size: 15px;
  }

}