:root {
  --color-primary: #4caf50;
  --color-secondary: #81d4fa;
  --color-accent: #2e7d32;
  --color-bg-light: #f5f5f5;
  --color-bg-dark: #1b1b1b;
  --color-text: #424242;
  --color-white: #ffffff;
  --font-main: "Poppins", sans-serif;
  --font-secondary: "Inter", sans-serif;
  --max-width: 1200px;
  --border-radius: 15px;
  --section-padding: 60px;
  --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.2);
  --transition: all 0.3s ease;
}

body {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-secondary);
}

h1,
h2,
h3 {
  font-family: var(--font-main);
}

p,
button {
  font-family: var(--font-secondary);
}

header {
  background: var(--color-white);
  padding: 20px 40px;
  box-shadow: var(--shadow-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-radius: 0 0 20px 20px;
  margin-bottom: 70px;
  transition: var(--transition);
}

header:hover {
  box-shadow: var(--shadow-hover);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
}

nav img {
  height: 80px;
  width: 200px;
  border-radius: 10px;
  object-fit: cover;
  object-position: center;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 20px;
  align-items: center;
  font-family: var(--font-secondary);
}

nav ul li a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: var(--transition);
}

nav ul li a:hover {
  color: var(--color-primary);
}

.top-buttons {
  display: flex;
  gap: 10px;
}

.top-buttons .login-button {
  border: 2px solid var(--color-accent);
  height: 48px;
  width: 100px;
  border-radius: 20px;
  background: transparent;
  color: var(--color-accent);
  transition: var(--transition);
  cursor: pointer;
}

.top-buttons .login-button:hover {
  background: var(--color-accent);
  color: white;
}

.top-buttons .signup-button {
  border: none;
  height: 48px;
  width: 100px;
  border-radius: 20px;
  background: var(--color-primary);
  color: white;
  transition: var(--transition);
  cursor: pointer;
}

.top-buttons .signup-button:hover {
  background: var(--color-secondary);
}

section {
  padding: var(--section-padding) 20px;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

#hero {
  background: url("https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=1470&q=80")
    no-repeat center center/cover;
  color: var(--color-white);
  padding: 100px 20px;
  border-radius: 20px 20px 0 0;
  height: 200px;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

#hero:hover {
  box-shadow: var(--shadow-hover);
}

.hero-buttons {
  margin-top: 20px;
  display: flex;
  gap: 20px;
  justify-content: center;
}

#hero .signup-button,
#hero .login-button {
  height: 50px;
  width: 150px;
  border-radius: 25px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}

#hero .signup-button {
  background: var(--color-secondary);
  border: none;
  color: white;
}

#hero .signup-button:hover {
  background: var(--color-primary);
  transform: scale(1.05);
}

#hero .login-button {
  background: var(--color-bg-light);
  border: 2px solid var(--color-white);
  color: var(--color-text);
}

#hero .login-button:hover {
  background: var(--color-white);
  color: var(--color-primary);
  transform: scale(1.05);
}

#about {
  background: var(--color-white);
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

#about:hover {
  box-shadow: var(--shadow-hover);
}

#about p {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.6;
}

#features {
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

#features:hover {
  box-shadow: var(--shadow-hover);
}

.containers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.feature-card {
  background: var(--color-white);
  padding: 20px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

#call-to-action {
  background: url("../images/mountains.png") no-repeat center center/cover;
  color: white;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

#call-to-action:hover {
  box-shadow: var(--shadow-hover);
}

#call-to-action .signup-button {
  border: none;
  height: 48px;
  width: 150px;
  font-weight: 600;
  border-radius: 25px;
  background: var(--color-primary);
  color: white;
  transition: var(--transition);
  cursor: pointer;
}

#call-to-action .signup-button:hover {
  background: var(--color-secondary);
  transform: scale(1.05);
}

#call-to-action p {
  max-width: 600px;
  margin: 0 auto 20px;
  font-size: 1.2em;
}

footer {
  background: var(--color-bg-dark);
  color: var(--color-white);
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}

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

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

@media (max-width: 768px) {
  .containers {
    grid-template-columns: 1fr;
  }

  nav {
    gap: 15px;
  }
}

@media (max-width: 520px) {
  nav ul,
  .top-buttons {
    display: none;
  }

  nav {
    justify-content: center;
    align-items: center;
    position: relative;
    gap: 0;
    padding: 8px 16px;
  }

  header {
    padding: 10px 16px;
    border-radius: 0;
    margin-bottom: 0;
  }
}