/*-----------------------------------------
1. CSS Reset
-----------------------------------------*/
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/*-----------------------------------------
2. Dark Mode Variables & Base Styles
-----------------------------------------*/
:root {
  --bg-color:           #121212;
  --text-color:         #e0e0e0;
  --accent-color:       #bb86fc;
  --header-bg:          #1f1f1f;
  --footer-bg:          #181818;
  --table-header-bg:    #272727;
  --table-row-even-bg:  #1c1c1c;
  --btn-bg:             #bb86fc;
  --btn-hover-bg:       #9c6efc;
  --link-hover-color:   #bb86fc;
}

body {
  font-family: 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

/*-----------------------------------------
3. Container & Layout Elements
-----------------------------------------*/
.container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 0;
}

header, main, footer {
  display: block;
}

main {
  padding: 1rem 0;
}

/*-----------------------------------------
4. Header
-----------------------------------------*/
header {
  background-color: var(--header-bg);
  padding: 1rem;
  text-align: center;
}

/*-----------------------------------------
5. Logo Formatting
-----------------------------------------*/
.logo {
  display: block;
  max-width: 250px;      /* increased for larger logo */
  height: auto;
  margin: 0.5rem auto;
}

header .logo {
  max-height: 100px;     /* increased header logo height */
}

/*-----------------------------------------
6. Typography & Links
-----------------------------------------*/
h1, h2, h3, h4, h5, h6 {
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  color: var(--btn-hover-bg);
  text-decoration: underline;
}

/*-----------------------------------------
7. Buttons
-----------------------------------------*/
.btn {
  display: inline-block;
  background-color: var(--btn-bg);
  color: var(--bg-color);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  text-align: center;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: var(--btn-hover-bg);
}

/*-----------------------------------------
8. Navigation List
-----------------------------------------*/
.nav-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 1rem 0;
}

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

.nav-list a:hover {
  color: var(--accent-color);
}

/*-----------------------------------------
9. Tables
-----------------------------------------*/
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  padding: 0.75rem;
  border: 1px solid #333;
  text-align: left;
}

th {
  background-color: var(--table-header-bg);
  color: var(--text-color);
}

tr:nth-child(even) {
  background-color: var(--table-row-even-bg);
}

/*-----------------------------------------
10. Keyword Highlight
-----------------------------------------*/
.keyword {
  background-color: rgba(187, 134, 252, 0.15);
  color: var(--accent-color);
  font-weight: 600;
  padding: 0.1em 0.2em;
  border-radius: 0.2rem;
}

/*-----------------------------------------
11. Footer
-----------------------------------------*/
footer {
  background-color: var(--footer-bg);
  color: var(--text-color);
  text-align: center;
  padding: 1rem;
}

/*-----------------------------------------
12. Utility Classes
-----------------------------------------*/
.text-center {
  text-align: center;
}

.m-y-1 {
  margin: 1rem 0;
}

.p-1 {
  padding: 1rem;
}