:root {
  --primary-color: #6366f1;
  --secondary-color: #4f46e5;
  --accent-color: #818cf8;
  --light-bg: #f3f4f6;
  --dark-text: #1f2937;
  --light-text: #f9fafb;
  --border-radius: 8px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--light-bg);
  color: var(--dark-text);
  line-height: 1.6;
}

header {
  background-color: #ffffff;
  box-shadow: var(--shadow);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
}

header.scrolled {
  padding: 0.5rem 0;
  background-color: rgba(255, 255, 255, 0.95);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.logo span {
  color: var(--dark-text);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--dark-text);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: var(--primary-color);
}

.nav-links a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--primary-color);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.main-content {
  display: flex;
  max-width: 1200px;
  margin: 120px auto 0;
  min-height: calc(100vh - 120px);
}

.sidebar {
  width: 280px;
  background-color: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  position: sticky;
  top: 100px;
  height: fit-content;
  transition: var(--transition);
}

.sidebar ul {
  list-style-type: none;
}

.sidebar-item {
  margin-bottom: 1rem;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-item:hover {
  background-color: var(--light-bg);
  color: var(--primary-color);
}

.sidebar-item i {
  transition: var(--transition);
}

.sidebar-item.active {
  background-color: var(--primary-color);
  color: var(--light-text);
}

.sidebar-item.active i {
  transform: rotate(90deg);
}

.sub-section {
  margin-left: 1rem;
  margin-top: 0.5rem;
  display: none;
  animation: fadeIn 0.3s ease;
}

.sub-item {
  padding: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.sub-item i {
  margin-right: 0.5rem;
  font-size: 0.8rem;
}

.sub-item:hover {
  background-color: var(--light-bg);
  color: var(--primary-color);
}

.sub-item.active {
  background-color: var(--accent-color);
  color: var(--light-text);
}

.content {
  flex-grow: 1;
  padding: 2rem;
  margin-left: 2rem;
  background-color: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.content-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid #e5e7eb;
  padding-bottom: 1rem;
}

.content-title {
  font-size: 1.8rem;
  color: var(--dark-text);
  font-weight: 600;
}

.content-subtitle {
  color: #6b7280;
  font-size: 1rem;
}

.note-link {
  margin: 1.5rem 0;
  background-color: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  transition: var(--transition);
  border-left: 4px solid transparent;
}

.note-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  border-left: 4px solid var(--primary-color);
}

.note-link a {
  text-decoration: none;
  color: var(--dark-text);
  font-weight: 500;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.note-link a:hover {
  color: var(--primary-color);
}

.note-link a i {
  opacity: 0;
  transition: var(--transition);
}

.note-link:hover a i {
  opacity: 1;
}

.tech {
  border-left-color: #3b82f6;
}

.movies {
  border-left-color: #f59e0b;
}

.social {
  border-left-color: #10b981;
}

.subscribe-form {
  margin-top: 2rem;
  padding: 1.5rem;
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
}

.form-title {
  margin-bottom: 1rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.input-group {
  margin-bottom: 1rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  border-radius: var(--border-radius);
  border: 1px solid #e5e7eb;
  outline: none;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.submit-btn {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--primary-color);
  color: var(--light-text);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

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

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  margin-left: 0.5rem;
  font-weight: 500;
}

.badge-tech {
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

.badge-movies {
  background-color: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
}

.badge-social {
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--dark-text);
  cursor: pointer;
}

.search-bar {
  margin-bottom: 2rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border-radius: var(--border-radius);
  border: 1px solid #e5e7eb;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: #9ca3af;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Media Queries */
@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    margin-bottom: 2rem;
    position: static;
  }

  .content {
    margin-left: 0;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #ffffff;
    flex-direction: column;
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .header-container {
    padding: 0 1rem;
  }
}

.dynamic-note-section {
  margin-top: 2rem;
  background-color: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  animation: fadeIn 0.5s ease;
  width: 100%;
}

.loaded-content {
  padding-top: 10px;
}

.loaded-content header {
  position: relative;
  margin-bottom: 30px;
  box-shadow: none;
}

.loaded-content .container {
  margin-top: 0;
  box-shadow: none;
  background: transparent;
}

.content + .dynamic-note-section {
  margin-top: 0.2rem;
}

#dynamic-note {
  display: none;
}