* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: #2c2c2c;
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────── */

.sidebar {
  width: 240px;
  min-height: 100vh;
  background: #16213e;
  padding: 0;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.sidebar-logo {
  padding: 1.5rem;
  border-bottom: 1px solid #1f2d50;
  flex-shrink: 0;
}

.sidebar-logo a {
  color: #e8eaf0;
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.sidebar-logo .tagline {
  display: block;
  color: #7888aa;
  font-size: 0.75rem;
  margin-top: 0.3rem;
}

.sidebar-nav {
  padding: 0.75rem 0;
  flex: 1;
  overflow-y: auto;
}

.sidebar-nav a {
  display: block;
  padding: 0.45rem 1.5rem;
  color: #aab4cc;
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.12s, color 0.12s;
}

.sidebar-nav a:hover {
  background: #1f2d50;
  color: #e8eaf0;
}

.sidebar-nav a.active {
  background: #1f2d50;
  color: #7ec8f8;
  font-weight: 600;
  border-left: 3px solid #7ec8f8;
  padding-left: calc(1.5rem - 3px);
}

.sidebar-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid #1f2d50;
  font-size: 0.75rem;
  color: #7888aa;
  flex-shrink: 0;
}

.sidebar-footer a {
  color: #aab4cc;
}

.sidebar-footer a:hover {
  text-decoration: underline;
}

.sidebar-footer .version {
  margin-top: 0.5rem;
  color: #556688;
}

/* ── Main content ────────────────────────────────────── */

.main {
  flex: 1;
  max-width: 860px;
  padding: 2.5rem 3rem 4rem;
  min-width: 0;
}

h1 { font-size: 1.9rem; font-weight: 700; margin-bottom: 1rem; color: #111; letter-spacing: -0.02em; }
h2 { font-size: 1.35rem; font-weight: 600; margin: 2.25rem 0 0.65rem; color: #1a1a1a; border-bottom: 1px solid #e8e8e8; padding-bottom: 0.3rem; }
h3 { font-size: 1.05rem; font-weight: 600; margin: 1.5rem 0 0.4rem; color: #333; }
h4 { font-size: 0.95rem; font-weight: 600; margin: 1.25rem 0 0.3rem; color: #444; }

p { margin-bottom: 0.9rem; }

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85em;
  background: #f3f4f6;
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: #c0392b;
}

.code-block {
  position: relative;
  margin: 1rem 0 1.25rem;
}

.code-block pre {
  margin: 0;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: #2a2a3e;
  color: #aab4cc;
  border: 1px solid #3a3a5e;
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.copy-btn:hover { background: #3a3a5e; color: #e8eaf0; }
.copy-btn.copied { color: #7ec8f8; }

pre {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 1rem 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
  font-size: 0.875rem;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

a { color: #1a6fc4; text-decoration: none; }
a:hover { text-decoration: underline; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}

th {
  background: #f3f4f6;
  font-weight: 600;
  text-align: left;
  padding: 0.55rem 0.85rem;
  border: 1px solid #dde0e5;
}

td {
  padding: 0.5rem 0.85rem;
  border: 1px solid #dde0e5;
  vertical-align: top;
}

tr:nth-child(even) td { background: #fafafa; }

ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.2rem; }
li > ul, li > ol { margin-top: 0.2rem; margin-bottom: 0; }

blockquote {
  border-left: 3px solid #7ec8f8;
  margin: 1rem 0;
  padding: 0.6rem 1rem;
  background: #f0f7ff;
  color: #444;
  border-radius: 0 4px 4px 0;
}

blockquote p:last-child { margin-bottom: 0; }

hr { border: none; border-top: 1px solid #e8e8e8; margin: 2rem 0; }

/* ── Download banner ─────────────────────────────────── */

.download-banner {
  background: #f0f7ff;
  border: 1px solid #c0ddf5;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.download-banner strong { color: #111; }

.download-btn {
  display: inline-block;
  background: #1a6fc4;
  color: #fff !important;
  padding: 0.4rem 1rem;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none !important;
  white-space: nowrap;
}

.download-btn:hover { background: #145ca0; }

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 768px) {
  body { flex-direction: column; }

  .sidebar {
    width: 100%;
    height: auto;
    min-height: auto;
    position: static;
  }

  .sidebar-nav {
    display: flex;
    flex-wrap: wrap;
    padding: 0.5rem;
    gap: 0.25rem;
  }

  .sidebar-nav a {
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
  }

  .sidebar-nav a.active {
    border-left: none;
    padding-left: 0.75rem;
  }

  .main { padding: 1.5rem; }
}