:root {
  --bg-color: #ffffff;
  --text-color: #171717;
  --primary-color: #3E2723;
  --secondary-color: #78909C;
  --accent-light: #f5f5f5;
  --transition: all 0.3s ease-in-out;
  --max-width: 1100px;
}

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

body {
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
}

header {
  border-bottom: 2px solid var(--primary-color);
  padding: 2rem 1rem;
  text-align: center;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1, h2, h3, h4 {
  color: var(--primary-color);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 2.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

p {
  margin-bottom: 1.2rem;
}

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

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

.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  background-color: var(--primary-color);
  color: #ffffff;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition);
}

.btn:hover {
  background-color: var(--secondary-color);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

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

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

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
}

nav a {
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 1px;
  color: var(--text-color);
}

nav a:hover {
  color: var(--secondary-color);
}

.card {
  background: var(--bg-color);
  border: 1px solid #eee;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--secondary-color);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.expert-guide-section {
  padding: 4rem 0;
  background-color: var(--accent-light);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

blockquote {
  border-left: 4px solid var(--secondary-color);
  padding: 1rem 2rem;
  margin: 2rem 0;
  font-style: italic;
  background: var(--accent-light);
}

footer {
  background-color: var(--primary-color);
  color: #ffffff;
  padding: 3rem 1rem;
  margin-top: 4rem;
  text-align: center;
}

footer a {
  color: var(--secondary-color);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.highlight {
  color: var(--primary-color);
  font-weight: bold;
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  nav ul { flex-direction: column; align-items: center; gap: 1rem; }
}