:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --accent: #0969da;
  --sidebar-bg: #f6f8fa;
  --border: #d0d7de;
}

html { background: #ffffff; color-scheme: light; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 80px auto;
  padding: 24px;
  text-align: center;
}

.container h1 { color: var(--accent); margin-bottom: 16px; }
.container p  { margin-bottom: 24px; opacity: 0.8; }
.container input {
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 6px;
}
.container button, .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  padding: 10px 20px;
  font-size: 16px;
}

.alert {
  background: rgba(248, 81, 73, 0.1);
  color: #cf222e;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid rgba(207, 34, 46, 0.3);
}

.hint {
  font-size: 12px;
  opacity: 0.6;
  margin-top: 16px;
}

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 280px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 20px;
  flex-shrink: 0;
}

.sidebar h2 { font-size: 16px; margin-bottom: 8px; color: var(--fg); }
.sidebar .meta { font-size: 12px; opacity: 0.6; margin-bottom: 16px; }

nav { display: flex; flex-direction: column; gap: 4px; }

.nav-item {
  display: block;
  padding: 6px 10px;
  border-radius: 4px;
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.15s;
}
.nav-item:hover, .nav-item.active {
  background: rgba(9, 105, 218, 0.1);
  color: var(--accent);
}
.nav-item.sub { padding-left: 20px; font-size: 13px; }
.nav-dir {
  padding: 8px 10px 4px;
  font-size: 12px;
  text-transform: uppercase;
  opacity: 0.5;
  letter-spacing: 0.05em;
}

.content {
  flex: 1;
  padding: 32px 48px;
  max-width: 900px;
}

.content h1 { margin-top: 28px; margin-bottom: 12px; color: #1f2328; font-size: 1.7em; }
.content h2 { margin-top: 24px; margin-bottom: 10px; color: #0550ae; font-size: 1.3em; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.content h3 { margin-top: 20px; margin-bottom: 8px; color: #1a7f37; font-size: 1.1em; }
.content h4 { margin-top: 16px; margin-bottom: 6px; color: #8250df; font-size: 1.0em; }
.content p  { margin-bottom: 12px; }
.content ul, .content ol { margin-left: 24px; margin-bottom: 12px; }
.content table { border-collapse: collapse; width: 100%; margin-bottom: 16px; }
.content th { background: var(--sidebar-bg); color: var(--accent); padding: 8px 12px; text-align: left; border: 1px solid var(--border); font-size: 0.9em; }
.content td { padding: 7px 12px; border: 1px solid var(--border); font-size: 0.9em; }
.content tr:hover td { background: rgba(9, 105, 218, 0.04); }
.content code {
  background: var(--sidebar-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: #cf222e;
}
.content pre {
  background: var(--sidebar-bg);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}
.content blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 16px;
  margin-bottom: 16px;
  opacity: 0.8;
  color: #57606a;
}
.content a { color: var(--accent); }

/* Shared markdown rendering — applies to both #md (public) and .content (personal) */
#md img { max-width: 100%; }
#md h1 { color: #1f2328; font-size: 1.7em; margin-top: 1.5em; margin-bottom: 0.5em; }
#md h2 { color: #0550ae; font-size: 1.3em; margin-top: 1.5em; margin-bottom: 0.4em; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
#md h3 { color: #1a7f37; font-size: 1.1em; margin-top: 1.3em; margin-bottom: 0.3em; }
#md h4 { color: #8250df; font-size: 1.0em; margin-top: 1.1em; margin-bottom: 0.3em; }
#md p { margin-bottom: 12px; line-height: 1.7; }
#md a { color: var(--accent); }
#md code { background: var(--sidebar-bg); padding: 2px 6px; border-radius: 4px; font-size: 0.88em; color: #cf222e; }
#md pre { background: var(--sidebar-bg); padding: 14px; border-radius: 8px; overflow-x: auto; margin-bottom: 14px; border: 1px solid var(--border); }
#md blockquote { border-left: 4px solid var(--accent); padding-left: 14px; opacity: 0.85; margin-bottom: 14px; color: #57606a; }
#md table { border-collapse: collapse; width: 100%; margin-bottom: 16px; }
#md th { background: var(--sidebar-bg); color: var(--accent); padding: 8px 12px; text-align: left; border: 1px solid var(--border); font-size: 0.9em; }
#md td { padding: 7px 12px; border: 1px solid var(--border); font-size: 0.9em; }
#md tr:hover td { background: rgba(9, 105, 218, 0.04); }
#md ul, #md ol { margin-left: 22px; margin-bottom: 12px; }
#md li { margin-bottom: 4px; }

@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
  .content { padding: 20px; }
}