/* Base Styles */
:root {
  --primary-color: #277ab9;
  --primary-dark: #225f93;
  --primary-darker: #1a4f7d;
  --text-color: #333;
  --bg-color: #F2F6FA;
  --white: #fff;
  --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --nav-width: 250px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-color);
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--primary-dark);
}

/* Layout Components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem;
  position: fixed;
  top: 0;
  left: var(--nav-width);
  right: 0;
  z-index: 100;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.logo {
  height: 60px;
  width: auto;
  display: block;
  margin: 0 auto;
}

.language-selector {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.language-selector select {
  padding: 0.5rem;
  font-size: 0.9rem;
  background-color: var(--primary-color);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.language-selector select:hover {
  background-color: var(--primary-dark);
}

.language-selector select:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.3);
}

/* Navigation Styles */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  background-color: var(--primary-color);
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
  overflow-y: auto;
  z-index: 1000;
  transition: transform 0.3s ease-in-out;
}

.nav-links {
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
}

nav a {
  padding: 0.8rem 1.5rem;
  color: var(--white);
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

nav a:hover {
  background-color: var(--primary-dark);
}

/* Submenu Styles */
.submenu {
  display: none;
  background-color: var(--primary-dark);
  padding-left: 1rem;
}

.submenu a {
  padding-left: 2rem;
}

.menu-item {
  position: relative;
}

.menu-item:hover > .submenu {
  display: block;
}

/* Main Content */
main {
  margin-left: var(--nav-width);
  padding: 6rem 2rem 2rem;
  flex: 1;
  transition: var(--transition);
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem;
  margin-bottom: 1rem;
  border-left: 2px solid #000;
  border-right: 2px solid #000;
}

.toolbar button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  transition: var(--transition);
}

.toolbar button img {
  width: 24px;
  height: 24px;
}

.toolbar button:hover {
  background-color: rgba(0, 0, 0, 0.1);
}

/* Logger */
#logger {
  border: 2px solid #333;
  padding: 1rem;
  overflow-y: auto;
  height: 150px;
  margin-top: 1rem;
  font-family: monospace;
  background-color: #f8f8f8;
}

/* Tab Menu */
.tab-menu {
  display: flex;
  background-color: #f7f7f7;
  border-radius: 8px 8px 0 0;
  overflow: hidden;
}

.tab-button {
  flex: 1;
  padding: 1rem;
  cursor: pointer;
  text-align: center;
  border: none;
  background-color: #f7f7f7;
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
}

.tab-button:hover, .tab-button.active {
  color: var(--primary-color);
  background-color: var(--white);
}

.tab-content {
  display: none;
  padding: 2rem;
  background-color: var(--white);
  border-radius: 0 0 8px 8px;
  box-shadow: var(--shadow);
}

.tab-content.active {
  display: block;
}

/* Forms */
form {
  background: var(--white);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

input, textarea, select {
  width: 100%;
  padding: 0.8rem;
  margin-bottom: 1rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-family: inherit;
  transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(39, 122, 185, 0.2);
}

button, .btn {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

button:hover, .btn:hover {
  background-color: var(--primary-dark);
}

/* Tables */
.table-container {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 2rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

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

th {
  background-color: var(--primary-color);
  color: var(--white);
  font-weight: 500;
}

tr:nth-child(even) {
  background-color: #f9f9f9;
}

tr:hover {
  background-color: #f1f1f1;
}

/* Footer */
footer {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 2rem;
  text-align: center;
  margin-left: var(--nav-width);
  transition: var(--transition);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  color: var(--white);
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-links a:hover {
  opacity: 0.8;
}

/* Video Container */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  margin-bottom: 2rem;
  overflow: hidden;
  border-radius: 8px;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* Responsive Styles */
@media screen and (max-width: 992px) {
  :root {
    --nav-width: 220px;
  }
  
  header {
    left: var(--nav-width);
  }
  
  nav {
    width: var(--nav-width);
  }
  
  main, footer {
    margin-left: var(--nav-width);
  }
}

@media screen and (max-width: 768px) {
  header {
    left: 0;
    padding: 0.8rem;
  }
  
  .logo {
    height: 50px;
  }
  
  nav {
    transform: translateX(-100%);
    width: 80%;
    max-width: 300px;
  }
  
  nav.active {
    transform: translateX(0);
  }
  
  main, footer {
    margin-left: 0;
    padding: 5rem 1rem 2rem;
  }
  
  .hamburger {
    display: block;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--white);
    cursor: pointer;
    padding: 0.5rem;
  }
  
  .overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  
  .overlay.active {
    opacity: 1;
    visibility: visible;
  }
  
  .tab-menu {
    flex-direction: column;
  }
  
  .language-selector {
    position: static;
    transform: none;
    margin-left: auto;
  }
}

@media screen and (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .tab-button {
    padding: 0.8rem;
    font-size: 0.9rem;
  }
  
  .tab-content {
    padding: 1rem;
  }
  
  form {
    padding: 1rem;
  }
  
  #logger {
    height: 120px;
    font-size: 0.9rem;
  }
}

/* Accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid #ffcc00;
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in {
  animation: fadeIn 0.5s ease-in;
}