:root {
  --primary-color: #00b764;
  --secondary-color: #00203f;
  --accent-color: #ff6f61;
  --text-color: #2d3436;
  --bg-color: #f0f3ff;
  --sidebar-bg-color: white;
  --border-color: #ddd;
  --highlight-color: #f0fff4;
  --transition-speed: 0.3s;
  --border-radius: 15px;
  --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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


html {
  scroll-behavior: smooth;
}

body {
  font-family: "Poppins", sans-serif;
  font-size: 16px;
  color: var(--text-color);
  background-color: var(--bg-color);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-speed),
    color var(--transition-speed);
}



.sidebar {
  width: 300px;
  background: var(--sidebar-bg-color);
  padding: 30px;
  box-shadow: var(--box-shadow);
  overflow-y: auto;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  transition: transform var(--transition-speed) ease-in-out,
    background-color var(--transition-speed);
  z-index: 1000;
}

.main-content {
  overflow-y:auto;
  flex-grow: 1;
  padding: 30px;
  margin-left: 300px;
  max-width: calc(100% - 300px);
  transition: margin-left var(--transition-speed) ease-in-out;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.search-form {
  display: flex;
  margin-bottom: 20px;
  border-radius: 50px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: box-shadow var(--transition-speed) ease;
}

.search-form input {
  flex-grow: 1;
  padding: 15px 20px;
  border: none;
  outline: none;
  font-size: 1rem;
  background-color: var(--sidebar-bg-color);
  color: var(--text-color);
  transition: background-color var(--transition-speed),
    color var(--transition-speed);
}

.search-form button {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 15px 18px;
  cursor: pointer;
  transition: background var(--transition-speed), transform 0.2s;
}

h1,
h2,
h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
  font-weight: 600;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 30px;
  text-align: center;
  position: relative;
}

nav ul {
  list-style-type: none;
}

nav ul li {
  margin-bottom: 15px;
}

nav ul li a {
  color: var(--text-color);
  text-decoration: none;
  padding: 10px 15px;
  display: block;
  border-radius: 50px;
  transition: all var(--transition-speed) ease;
  position: relative;
  z-index: 1;
  overflow: hidden;
  font-weight: 700;
}

nav ul li a:hover,
nav ul li a:focus {
  background-color: var(--highlight-color);
}

.article-section {
  padding: 30px;
  background: var(--sidebar-bg-color);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 40px;
  transition: transform var(--transition-speed),
    box-shadow var(--transition-speed), background-color var(--transition-speed);
  position: relative;
  overflow: hidden;
}

.article-section:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.category {
  margin-top: 30px;
}

.category h3 {
  color: var(--secondary-color);
  font-size: 1.2rem;
  margin-bottom: 15px;
  position: relative;
  padding-left: 20px;
}

.go-to-top-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 30px;
  right: 30px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  box-shadow: var(--box-shadow);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  opacity: 0;
  visibility: hidden;
}

.go-to-top-btn:hover,
.go-to-top-btn:focus {
  background-color: var(--accent-color);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--primary-color);
  cursor: pointer;
  position: fixed;
  top: 15px;
  left: 15px;
  z-index: 1001;
  transition: all var(--transition-speed) ease;
  padding: 10px;
  border-radius: 50%;
}

.feedback-form {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
}

.feedback-form textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  resize: vertical;
  min-height: 100px;
  background-color: var(--sidebar-bg-color);
  color: var(--text-color);
  transition: border-color var(--transition-speed),
    background-color var(--transition-speed), color var(--transition-speed);
}

.feedback-form button {
  align-self: flex-start;
  margin-top: 10px;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

.feedback-form button:hover,
.feedback-form button:focus {
  background-color: var(--accent-color);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.article-section {
  animation: fadeInUp 0.5s ease-out forwards;
}

@media (max-width: 1200px) {
  .sidebar {
    width: 250px;
  }
  .main-content {
    margin-left: 250px;
    max-width: calc(100% - 250px);
  }
}

@media (max-width: 992px) {
  .sidebar {
    width: 200px;
  }
  .main-content {
    margin-left: 200px;
    max-width: calc(100% - 200px);
  }
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: -100%;
    z-index: 1001;
    transition: left var(--transition-speed) ease;
    padding-bottom: 80px;
  }
  .sidebar.active {
    left: 0;
  }
  .main-content {
    margin-left: 0;
    max-width: 100%;
    padding-top: 80px;
  }
  .menu-toggle {
    display: block;
  }
  .search-form input,
  .search-form button,
  nav ul li a {
    padding: 15px 20px;
  }
  .go-to-top-btn {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .article-section {
    padding: 20px;
  }
  h1 {
    font-size: 2rem;
  }
  .search-form {
    flex-direction: column;
    border-radius: var(--border-radius);
  }
  .search-form input,
  .search-form button {
    width: 100%;
    border-radius: 0;
  }
  .search-form button {
    margin-top: 10px;
  }
  .feedback-form button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

@media (hover: hover) {
  .search-form button:hover,
  nav ul li a:hover,
  .go-to-top-btn:hover,
  .feedback-form button:hover {
    transform: translateY(-2px);
  }
}

.search-form input:focus,
.search-form button:focus,
nav ul li a:focus,
.go-to-top-btn:focus,
.feedback-form button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 182, 115, 0.3);
}