/* ===================================
   Modern Ocean Blue Stylesheet with Dark Mode
   =================================== */

/* CSS Variables for Light Mode */
:root {
  --ocean-blue: #2196F3;
  --dark-blue: #1976D2;
  --light-blue: #E3F2FD;
  --accent-blue: #42A5F5;
  --text-dark: #1a1a1a;
  --text-light: #4a4a4a;
  --white: #ffffff;
  --gray-light: #f5f5f5;
  --gray-medium: #cccccc;
  --gray-dark: #666666;
  --border-radius: 8px;
  --transition: all 0.3s ease;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --shadow: rgba(0, 0, 0, 0.1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --ocean-blue: #42A5F5;
  --dark-blue: #2196F3;
  --light-blue: #1a2332;
  --accent-blue: #64B5F6;
  --text-dark: #e0e0e0;
  --text-light: #b0b0b0;
  --white: #121212;
  --gray-light: #1e1e1e;
  --gray-medium: #3a3a3a;
  --gray-dark: #a0a0a0;
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --shadow: rgba(255, 255, 255, 0.1);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-dark);
  margin-left: 10px;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-light);
  margin-left: 10px;
}

/* Links */
a {
  color: var(--ocean-blue);
  text-decoration: underline;
  transition: var(--transition);
  font-weight: 500;
}

a:hover {
  color: var(--dark-blue);
  text-decoration: underline;
  background-color: var(--light-blue);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

a:active {
  color: var(--accent-blue);
}

a:visited {
  color: #9C27B0;
}

[data-theme="dark"] a:visited {
  color: #CE93D8;
}

/* Lists */
ul, ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--text-light);
}

ul ul, ol ol, ul ol, ol ul {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

dl {
  margin-bottom: 1rem;
}

dt {
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.25rem;
}

dd {
  margin-left: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-light);
}

/* Buttons */
button,
input[type="submit"],
input[type="button"],
input[type="reset"] {
  background-color: var(--ocean-blue);
  color: var(--white);
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  display: inline-block;
  width:auto;
  /*max-width: 300px;*/
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea {
  display: inline-block;
  width: 1000px;      /* Do not take full width */
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: var(--border-radius);
  border: 1px solid #ccc;
}

button:hover,
input[type="submit"]:hover,
input[type="button"]:hover,
input[type="reset"]:hover {
  background-color: var(--dark-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

button:active,
input[type="submit"]:active,
input[type="button"]:active,
input[type="reset"]:active {
  transform: translateY(0);
}

button:disabled {
  background-color: var(--gray-medium);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Forms */
form {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="url"],
input[type="search"],
input[type="number"],
input[type="date"],
input[type="time"],
textarea,
select {
  width: auto;
  padding: 0.75rem;
  border: 2px solid var(--gray-medium);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
  background-color: var(--bg-primary);
  color: var(--text-dark);
}

input:focus,
textarea:focus,
select:focus {
  width: auto;
  outline: none;
  border-color: var(--ocean-blue);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
}

textarea {
  resize: both;
  min-height: 120px;
}

input[type="checkbox"],
input[type="radio"] {
  margin-right: 0.5rem;
  accent-color: var(--ocean-blue);
}

fieldset {
  border: 2px solid var(--gray-medium);
  border-radius: var(--border-radius);
  padding: 1rem;
  margin-bottom: 1rem;
}

legend {
  font-weight: 700;
  color: var(--text-dark);
  padding: 0 0.5rem;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  background-color: var(--bg-primary);
  box-shadow: 0 2px 8px var(--shadow);
}

thead {
  background-color: var(--ocean-blue);
  color: var(--white);
}

th {
  padding: 1rem;
  text-align: left;
  font-weight: 700;
}

td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--gray-medium);
}

tbody tr:hover {
  background-color: var(--light-blue);
  transition: var(--transition);
}

tbody tr:nth-child(even) {
  background-color: var(--bg-secondary);
}

tfoot {
  background-color: var(--dark-blue);
  color: var(--white);
  font-weight: 600;
}

/* Images and Media */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius);
}

figure {
  margin-bottom: 1.5rem;
}

figcaption {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--gray-dark);
  font-style: italic;
  text-align: center;
}

video,
audio {
  max-width: 100%;
  border-radius: var(--border-radius);
}

/* Code and Preformatted Text */
code {
  background-color: var(--light-blue);
  color: var(--ocean-blue);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
}

pre {
  background-color: var(--gray-light);
  color: var(--text-dark);
  padding: 1rem;
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin-bottom: 1rem;
  border: 2px solid var(--gray-medium);
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid var(--ocean-blue);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-light);
  background-color: var(--light-blue);
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
}

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

cite {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--gray-dark);
  font-style: normal;
}

/* Horizontal Rule */
hr {
  border: none;
  border-top: 2px solid var(--gray-medium);
  margin: 2rem 0;
}

/* Inline Text Elements */
strong, b {
  font-weight: 700;
  color: var(--text-dark);
}

em, i {
  font-style: italic;
}

small {
  font-size: 0.875rem;
  color: var(--gray-dark);
}

mark {
  background-color: #ffeb3b;
  color: #000;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

del {
  text-decoration: line-through;
  color: var(--gray-dark);
}

ins {
  text-decoration: underline;
  color: var(--ocean-blue);
}

sub, sup {
  font-size: 0.75rem;
}

abbr[title] {
  text-decoration: underline dotted;
  cursor: help;
  color: var(--ocean-blue);
}

/* Article and Section Elements */
article,
section,
aside,
nav,
header,
footer,
main {
  display: block;
}

article {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px var(--shadow);
  border: 1px solid var(--gray-medium);
}

section {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--light-blue);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--ocean-blue);
  margin-left: 10px;
}

aside {
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 2px solid var(--gray-medium);
  margin-bottom: 1.5rem;
}

nav {
  margin-bottom: 1.5rem;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

nav ul li {
  margin-bottom: 0;
}

nav a {
  color: var(--ocean-blue);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

nav a:hover {
  background-color: var(--light-blue);
  text-decoration: none;
}

header {
  background-color: var(--dark-blue);
  color: var(--white);
  padding: 2rem 0;
  margin-bottom: 2rem;
}

header h1,
header h2,
header h3,
header h4,
header h5,
header h6 {
  color: var(--white);
}

header p {
  color: rgba(255, 255, 255, 0.9);
}

footer {
  background-color: var(--dark-blue);
  color: var(--white);
  padding: 2rem 0;
  margin-top: 3rem;
}

footer a {
  color: var(--accent-blue);
}

footer a:hover {
  color: var(--white);
}

footer p {
  color: rgba(255, 255, 255, 0.9);
}

main {
  min-height: 60vh;
  padding: 1rem 0;
}

/* Details and Summary */
details {
  background-color: var(--bg-secondary);
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  border: 2px solid var(--gray-medium);
}

summary {
  font-weight: 700;
  color: var(--ocean-blue);
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

summary:hover {
  color: var(--dark-blue);
}

details[open] summary {
  margin-bottom: 1rem;
  color: var(--dark-blue);
}

/* Progress and Meter */
progress,
meter {
  width: 100%;
  height: 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
}

progress {
  accent-color: var(--ocean-blue);
}

meter {
  accent-color: var(--ocean-blue);
}

/* Address */
address {
  font-style: normal;
  margin-bottom: 1rem;
  color: var(--text-light);
  line-height: 1.8;
}

/* Keyboard and Sample */
kbd {
  background-color: var(--gray-medium);
  color: var(--text-dark);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  box-shadow: 0 2px 4px var(--shadow);
  border: 1px solid var(--gray-dark);
}

samp {
  background-color: var(--light-blue);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
}

/* Variable */
var {
  font-style: italic;
  color: var(--ocean-blue);
  font-family: 'Courier New', monospace;
}

/* Dialog */
dialog {
  border: 2px solid var(--ocean-blue);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: 0 8px 24px var(--shadow);
  background-color: var(--bg-primary);
  color: var(--text-dark);
}

dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.5);
}

/* Dark Mode Toggle Button */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  background-color: var(--ocean-blue);
  color: var(--white);
  border: none;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 1rem;
  box-shadow: 0 2px 8px var(--shadow);
  transition: var(--transition);
}

.theme-toggle:hover {
  background-color: var(--dark-blue);
  transform: scale(1.05);
}

/* Utility Classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: 1rem; }
.mb-1 { margin-bottom: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }

/* Responsive Design */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  table {
    font-size: 0.875rem;
  }
  
  th, td {
    padding: 0.5rem;
  }
  
  .theme-toggle {
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }
}