```css
/* =========================================
   Vivarium Buddy - Design System & Styles
   ========================================= */

/* --- 0. Floating Nav (Mobile) --- */

.floating-nav-btn {
  display: none;
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 9999;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: none;
  background-color: var(--cream-bg, #FEFAE0);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px;
  transition: background-color 0.2s;
}

.floating-nav-btn span {
  display: block;
  width: 22px;
  height: 2.5px;
  background-color: #1B4332;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.floating-nav-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.floating-nav-btn.active span:nth-child(2) {
  opacity: 0;
}
.floating-nav-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.floating-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9998;
  background-color: rgba(27, 67, 50, 0.95);
  justify-content: center;
  align-items: center;
}

.floating-nav-overlay.active {
  display: flex;
}

.floating-nav-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
}

.floating-nav-menu li {
  margin: 1.25rem 0;
}

.floating-nav-menu a {
  font-family: 'Nunito', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #FEFAE0;
  text-decoration: none;
  transition: color 0.2s;
}

.floating-nav-menu a:hover {
  color: #E9C46A;
}

@media (max-width: 1023px) {
  .floating-nav-btn {
    display: flex;
  }
}

/* --- 1. Variables & Reset --- */
:root {
  /* Colors */
  --primary-green: #2D6A4F;
  --dark-forest: #1B4332;
  --warm-amber: #E9C46A;
  --cream-bg: #FEFAE0;
  --light-cream: #FFFDF5;
  --text-dark: #1A1A2E;
  --text-light: #FFFFFF;
  --text-muted: #6B7280;
  --border-color: #E5E7EB;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Typography */
  --font-heading: 'Nunito', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Spacing & Layout */
  --container-width: 1200px;
  --radius: 8px;
  --header-height: 80px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--cream-bg);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-dark);
  background-color: var(--cream-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--dark-forest);
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

/* --- 2. Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 4rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--primary-green);
  color: var(--text-light);
}

.btn-primary:hover {
  background-color: var(--dark-forest);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-amber {
  background-color: var(--warm-amber);
  color: var(--dark-forest);
}

.btn-amber:hover {
  background-color: #dcb356;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* --- 3. Components --- */

/* Header */
.site-header {
  background-color: var(--cream-bg);
  color: var(--text-dark);
  height: auto;
  position: relative;
  z-index: 1000;
  padding: 0.75rem 0;
}

.header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--dark-forest);
  margin: 0 auto;
  justify-content: center;
  transform: translateX(-12%);
}

@media (max-width: 639px) {
  .logo-area .logo-icon {
    margin-left: 10%;
  }
}

@media (min-width: 1024px) {
  .logo-area {
    transform: translateX(-8%);
  }
}

.logo-area .logo-wordmark,
.logo-area .logo-icon {
  height: 120px;
  width: auto;
}

@media (min-width: 640px) {
  .logo-area .logo-wordmark,
  .logo-area .logo-icon {
    height: 150px;
  }
}

@media (min-width: 1024px) {
  .logo-area .logo-wordmark,
  .logo-area .logo-icon {
    height: 170px;
  }
}

/* Desktop Nav */
.main-nav ul {
  display: flex;
  gap: 2rem;
}

.main-nav a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--dark-forest);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary-green);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--dark-forest);
  margin: 5px 0;
  border-radius: 2px;
  transition: 0.3s;
}

/* Hero */
.hero {
  background-color: var(--cream-bg);
  background-image: url('../images/2026-02-21-hero-creature-panorama.png');
  background-size: cover;
  background-position: center bottom;
  background-repeat: no-repeat;
  position: relative;
  padding: 4rem 0 4rem;
  text-align: center;
  margin-top: 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: rgba(254, 250, 224, 0.78);
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--primary-green);
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Cards */
.card-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

.card {
  background-color: var(--light-cream);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-top: 4px solid var(--warm-amber);
}

.card-image {
  width: 100%;
  height: 220px;
  object-fit: contain;
  object-position: center;
  background-color: var(--cream-bg);
  padding: 0.5rem;
}

.card-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  color: var(--primary-green);
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-link {
  font-weight: 700;
  color: var(--primary-green);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.card-link:hover {
  color: var(--dark-forest);
  text-decoration: underline;
}

/* Feature Cards (Why Us) */
.feature-card {
  text-align: center;
  padding: 2rem;
  background: var(--light-cream);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

/* Blog Cards */
.blog-card {
  background: var(--light-cream);
  padding: 2rem;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary-green);
  transition: transform 0.2s;
}

.blog-card:hover {
  transform: translateX(4px);
}

.blog-title {
  font-size: 1.25rem;
  color: var(--primary-green);
  margin-bottom: 0.75rem;
}

.blog-link {
  color: var(--primary-green);
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 1rem;
  display: inline-block;
}

/* Newsletter */
.newsletter-section {
  background-color: var(--primary-green);
  color: var(--text-light);
  text-align: center;
  border-radius: var(--radius);
  padding: 3rem 2rem;
}

.newsletter-section h2,
.newsletter-section p {
  color: var(--text-light);
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
  max-width: 450px;
  margin: 2rem auto 0;
  flex-wrap: wrap;
}

.newsletter-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  border: none;
  font-family: var(--font-body);
  min-width: 200px;
}

/* Footer */
.site-footer {
  background-color: var(--dark-forest);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 0;
  font-size: 0.9rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-logo-icon {
  height: 48px;
  width: auto;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-light);
}

.footer-col h4 {
  color: var(--text-light);
  margin-bottom: 1.25rem;
  font-size: 1.1rem;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a:hover {
  color: var(--warm-amber);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.8rem;
}

/* --- 4. Responsive Media Queries --- */

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }

  .main-nav {
    display: block;
  }
  
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

/* Mobile Nav Styles */
@media (max-width: 1023px) {
  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--cream-bg);
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--border-color);
  }

  .main-nav.is-open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }

  .main-nav li {
    width: 100%;
    text-align: center;
  }

  .main-nav a {
    display: block;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--dark-forest);
  }
  
  .menu-toggle {
    display: block;
  }
}