/* ---- Color & Typography ---- */
:root {
  --primary-color: #003366;
  --primary-gradient: linear-gradient(135deg, #003366, #0055a5);
  --secondary-color: #0073aa;
  --hover-color: #0099ff;
  --light-gray: #f9f9f9;
  --border-gray: #d0d0d0;
  --text-dark: #222;
  --content-max: 1200px;
  --sidebar-width: 250px;
  --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.08);
  --radius: 10px;
  --transition: all 0.3s ease;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: #fff;
  color: var(--text-dark);
  margin: 0;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---- Links ---- */
a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}
a:hover {
  color: var(--hover-color);
  text-decoration: underline;
}

/* ---- Headers ---- */
h1, h2, h3 {
  font-weight: 600;
  margin: 0 0 0.6em 0;
}
h1 { 
  background: var(--primary-gradient);
  color: #fff; 
  padding: 0.25em 0.5em;
  border-radius: var(--radius);
  display: inline-block;
}
h2, h3 {
  color: var(--primary-color);
}

/* ---- Paragraphs ---- */
p {
  margin: 0.7em 0;
}

/* ---- Header ---- */
header {
  background: var(--primary-gradient);
  color: #fff;
  padding: 1em 0;
  box-shadow: var(--shadow-light);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom-left-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
}
.header-container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 1em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header h1 {
  font-size: 2em;
}

/* ---- Main layout ---- */
.main-wrapper {
  display: flex;
  flex: 1;
  max-width: var(--content-max);
  margin: 1.5em auto;
  padding: 0 1em;
  gap: 1.5em;
  width: 100%;
}

/* ---- Sidebar ---- */
.sidebar {
  width: var(--sidebar-width);
  padding: 1em;
  background: var(--light-gray);
  border-radius: var(--radius);
  border: 1px solid var(--border-gray);
  flex-shrink: 0;
  box-shadow: var(--shadow-light);
}
.sidebar h3 {
  font-size: 1.1em;
  margin-bottom: 0.75em;
}
.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar li {
  margin-bottom: 0.5em;
}
.sidebar a {
  display: block;
  padding: 0.45em 0.7em;
  border-radius: var(--radius);
  transition: var(--transition);
}
.sidebar a:hover {
  background: rgba(0, 115, 170, 0.15);
}

/* ---- Content ---- */
main.content {
  flex: 1;
  padding: 0 1em;
}
.section {
  margin-bottom: 2em;
}
h2 {
  font-size: 1.4em;
  border-bottom: 2px solid var(--secondary-color);
  padding-bottom: 0.4em;
  margin-top: 0.7em;
}

/* ---- Lists ---- */
ul.nested {
  padding-left: 1.4em;
  margin-top: 0.6em;
}
ul.nested li {
  margin-bottom: 0.4em;
}

/* ---- Notes/Info ---- */
.note {
  background: #e0f0ff;
  border-left: 5px solid var(--secondary-color);
  padding: 1.1em;
  margin: 1.3em 0;
  font-size: 0.96em;
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

/* ---- Code blocks ---- */
pre {
  background: #f0f4f8;
  padding: 0.85em;
  border-radius: var(--radius);
  overflow-x: auto;
  border: 1px solid #cdd6e0;
  font-size: 0.95em;
  line-height: 1.45;
  margin: 0.7em 0;
}
code {
  font-family: "Fira Code", Consolas, "Courier New", monospace;
  color: #222;
}

/* ---- Bookmarklet Links (Styled as Buttons) ---- */
.bookmarklet {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  padding: 0.65em 1em;
  border-radius: var(--radius);
  box-shadow: var(--shadow-light);
  text-align: center;
  cursor: grab;
  transition: var(--transition);
  text-decoration: none;
  margin: 0.35em 0.35em;
}
.bookmarklet:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}
.bookmarklet:active {
  cursor: grabbing;
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

/* ---- Footer ---- */
footer {
  background: #fdfdfd;
  color: #555;
  font-size: 0.9em;
  text-align: center;
  padding: 1.2em 0;
  border-top: 1px solid var(--border-gray);
  margin-top: auto;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.03);
  border-radius: var(--radius)  var(--radius) 0 0;
}

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .main-wrapper {
    flex-direction: column;
    margin: 1em auto;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-gray);
  }
  header h1 {
    font-size: 1.6em;
  }
}

/* ---- Modal ---- */
#readmeModal {
  display: none;
  position: fixed;
  top: 10%;
  left: 10%;
  width: 80%;
  height: 80%;
  background: white;
  border: 1px solid #ccc;
  padding: 20px;
  overflow: auto;
  z-index: 10000;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
#readmeModal button {
  float: right;
  margin-bottom: 10px;
}
#readmeContent {
  font-family: sans-serif;
}