/* --- LAB STYLES --- */
:root {
  --bg: #FDFBF7; /* Warm cream */
  --text: #2D2926; /* Deep charcoal */
  --accent: #B45309; /* Warm Terracotta */
  --accent-light: #FDE68A;
  --font-serif: 'Lora', serif;
  --font-sans: 'Montserrat', sans-serif;
  --radius: 8px;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  padding: 40px 24px;
}

nav {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back-link {
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0.6;
  transition: opacity 0.3s;
}

.back-link:hover { opacity: 1; }

.lab-tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 50px;
  font-weight: 600;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.hero {
  margin-bottom: 80px;
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.1;
  margin-bottom: 24px;
}

.accent { color: var(--accent); }

.subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  color: #555;
  max-width: 600px;
}

.offer .card {
  background: white;
  padding: 60px;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  border-top: 5px solid var(--accent);
}

h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 20px;
}

.card p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  background: var(--text);
  color: white;
  padding: 16px 32px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.3s, background 0.3s;
}

.btn:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

footer {
  text-align: center;
  padding: 80px 24px;
  font-size: 0.85rem;
  opacity: 0.5;
}