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

:root {
  --primary-color: #e67e22;
  --primary-color-hover: #f39c12;
  --text-color: #333;
  --text-color-secondary: #555;
  --background-color: #fff;
  --background-color-scrolled: #f8f8f8;
  --box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  --box-shadow-scrolled: 0 2px 10px rgba(0, 0, 0, 0.2);
  --underline-color: #e67e22;
  --underline-height: 3px;
  --hamburger-color: #333;
  --theme-toggle-bg: #f0f0f0;
  --theme-toggle-dot: #333;
  --nav-background: #fff;
  --nav-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --primary-color: #ff9f43;
  --primary-color-hover: #ffa94d;
  --text-color: #f5f5f5;
  --text-color-secondary: #e0e0e0;
  --background-color: #1a1a1a;
  --background-color-scrolled: #242424;
  --box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  --box-shadow-scrolled: 0 2px 10px rgba(0, 0, 0, 0.4);
  --underline-color: #ff9f43;
  --hamburger-color: #f5f5f5;
  --theme-toggle-bg: #444;
  --theme-toggle-dot: #fff;
  --nav-background: #1a1a1a;
  --nav-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.content {
  padding-top: 80px;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--nav-background);
  color: var(--text-color);
  padding: 1.2rem 2rem;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  box-shadow: var(--nav-shadow);
  transition: all 0.4s ease;
}

.navbar.scrolled {
  background-color: var(--background-color-scrolled);
  box-shadow: var(--box-shadow-scrolled);
}

.navbar-brand {
  font-size: 2rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--primary-color);
  transition: color 0.4s ease;
}

.navbar-brand:hover {
  color: var(--primary-color-hover);
}

.navbar-nav {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin-left: 2rem;
}

.nav-link {
  color: var(--text-color-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  position: relative;
  transition: color 0.4s ease;
}

.nav-link:after {
  content: '';
  position: absolute;
  width: 0;
  height: var(--underline-height);
  background-color: var(--underline-color);
  left: 50%;
  transform: translateX(-50%);
  bottom: -6px;
  transition: width 0.4s ease;
}

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

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

.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active:after {
  width: 100%;
}

.theme-toggle {
  position: relative;
  width: 50px;
  height: 25px;
  cursor: pointer;
  display: inline-block;
}

.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.theme-toggle-slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--theme-toggle-bg);
  border-radius: 25px;
  transition: 0.4s;
}

.theme-toggle-slider:before {
  position: absolute;
  content: "";
  height: 19px;
  width: 19px;
  left: 3px;
  bottom: 3px;
  background-color: var(--theme-toggle-dot);
  border-radius: 50%;
  transition: 0.4s;
}

input:checked + .theme-toggle-slider:before {
  transform: translateX(25px);
}

.hamburger {
  display: none;
  cursor: pointer;
  font-size: 1.8rem;
  color: var(--hamburger-color);
}

@media (max-width: 768px) {
  .navbar {
      padding: 1rem;
  }

  .hamburger {
      display: block;
  }

  .navbar-nav {
      display: none;
  }

  .navbar.responsive .navbar-nav {
      display: flex;
      flex-direction: column;
      position: absolute;
      top: 60px;
      left: 0;
      width: 100%;
      background-color: var(--nav-background);
      padding: 1rem;
      box-shadow: var(--nav-shadow);
  }

  .navbar.responsive .nav-item {
      margin: 0.5rem 0;
      width: 100%;
      text-align: center;
  }

  .navbar.responsive .theme-toggle {
      margin: 1rem 0;
  }
}


body {
  background-color: #ffffff;
  color: #333333;
}


body.dark-mode {
  background-color: #333333;
  color: #ffffff;
}


.dark-mode .navbar {
  background-color: #222222;
}

.dark-mode .nav-link {
  color: #ffffff;
}