/* CSS Variables for Light/Dark Mode and Accessibility */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  
  /* Color Palette - Light Mode (Outdoorsy & Premium) */
  --bg-primary: #fcfcf9;
  --bg-secondary: #f4f4ee;
  --bg-card: #ffffff;
  --text-primary: #1c2826;
  --text-secondary: #485c58;
  --text-muted: #728480;
  
  --accent-primary: #2d5a27;      /* Forest Green */
  --accent-primary-hover: #1e3f19;
  --accent-primary-light: #eaf2e8;
  --accent-secondary: #8c6239;    /* Earth Brown */
  --border-color: #e2e2d8;
  --focus-ring: #2d5a27;
  
  --shadow-sm: 0 2px 4px rgba(28, 40, 38, 0.04);
  --shadow-md: 0 4px 12px rgba(28, 40, 38, 0.08);
  --shadow-lg: 0 8px 24px rgba(28, 40, 38, 0.12);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

[data-theme="dark"] {
  /* Color Palette - Dark Mode */
  --bg-primary: #111615;
  --bg-secondary: #1a2220;
  --bg-card: #202a28;
  --text-primary: #f0f3f2;
  --text-secondary: #cdd5d3;
  --text-muted: #93a29f;
  
  --accent-primary: #4e9f3d;      /* Bright Forest Green */
  --accent-primary-hover: #63b850;
  --accent-primary-light: #20351d;
  --accent-secondary: #b58961;    /* Earth Sand */
  --border-color: #2b3936;
  --focus-ring: #4e9f3d;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s, color 0.3s;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent-primary);
  color: #fff;
  padding: 10px 20px;
  z-index: 100;
  transition: top 0.2s;
  text-decoration: none;
  font-weight: 600;
  border-bottom-right-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--accent-secondary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.5em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: 1.2em;
  color: var(--text-secondary);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-primary-hover);
  text-decoration: underline;
}

/* Global Focus Styles */
:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 4px;
}

/* Layout Utilities */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header & Navigation */
.site-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
  transition: background-color 0.3s, border-color 0.3s;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo-group {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-size: 1.5rem;
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.5px;
}

.site-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.site-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.main-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent-primary);
  text-decoration: none;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: var(--transition);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* Theme Toggle Switch */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-primary);
}

.theme-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.5rem;
}

/* Grid Layout for Home Feed */
.home-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding: 3rem 0;
}

@media (min-width: 992px) {
  .home-layout {
    grid-template-columns: 2.5fr 1fr;
  }
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 600px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Blog Post Card */
.post-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-primary);
}

.post-card-img-link {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.post-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.post-card:hover .post-card-img {
  transform: scale(1.05);
}

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

.post-card-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.post-category {
  color: var(--accent-secondary);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.post-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.post-card-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.post-card-title a:hover {
  color: var(--accent-primary);
}

.post-card-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.post-card-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.post-card-author {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.read-more-btn {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.read-more-btn::after {
  content: '→';
  transition: transform 0.2s;
}

.read-more-btn:hover::after {
  transform: translateX(3px);
}

/* Sidebar Styling */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.widget {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 1.15rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  position: relative;
}

.widget-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--accent-primary);
}

.widget-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.widget-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.widget-list a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

.widget-list a:hover {
  color: var(--accent-primary);
}

/* Promo/Teaser Widget for Zone 2 Training */
.promo-widget {
  background: linear-gradient(135deg, var(--accent-primary-light), var(--bg-card));
  border: 1px solid var(--accent-primary);
  position: relative;
}

.promo-tag {
  background-color: var(--accent-secondary);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 99px;
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.promo-title {
  color: var(--text-primary);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.promo-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.promo-btn {
  background-color: var(--accent-primary);
  color: white !important;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  display: inline-block;
  text-align: center;
  text-decoration: none !important;
  transition: var(--transition);
}

.promo-btn:hover {
  background-color: var(--accent-primary-hover);
  transform: translateY(-1px);
}

/* Footer */
.site-footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1.5rem;
  margin-top: auto;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background-color 0.3s, border-color 0.3s;
}

.footer-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-container {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-about h3,
.footer-links h3,
.footer-newsletter h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

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

/* Newsletter Form */
.subscribe-form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.subscribe-input {
  flex-grow: 1;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.subscribe-btn {
  background-color: var(--accent-primary);
  color: white;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* Post Page Styling */
.post-layout {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 0;
}

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  line-height: 1.15;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.post-hero-image {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 2.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.post-content h3 {
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content blockquote {
  border-left: 4px solid var(--accent-primary);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-primary);
}

.post-content hr {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 2.5rem 0;
}

.post-content figure {
  margin: 2rem 0;
  text-align: center;
}

.post-content figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.post-content figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* Buy the Guide Layout */
.product-showcase {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  padding: 2rem 0;
}

@media (min-width: 768px) {
  .product-showcase {
    grid-template-columns: 1fr 1.2fr;
  }
}

.product-image-container {
  display: flex;
  justify-content: center;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--border-color);
}

.book-mockup {
  max-width: 250px;
  box-shadow: 10px 10px 30px rgba(0,0,0,0.15);
  border-radius: 4px;
}

.purchase-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white !important;
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
  text-decoration: none;
}

/* BMR Calculator styling */
.calculator-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  margin: 2rem 0;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 600px) {
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group-full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input,
.form-select {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus {
  border-color: var(--accent-primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-primary-light);
}

.radio-group {
  display: flex;
  gap: 1rem;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-weight: 500 !important;
}

.radio-label input {
  accent-color: var(--accent-primary);
  width: 1.1rem;
  height: 1.1rem;
}

.unit-toggle {
  display: flex;
  background-color: var(--bg-secondary);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.unit-btn {
  flex-grow: 1;
  background: none;
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.unit-btn.active {
  background-color: var(--bg-card);
  color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

/* Height metric vs imperial grid */
.height-imperial {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

/* Results section styling */
.calc-results {
  display: none;
  border-top: 2px dashed var(--border-color);
  padding-top: 2rem;
  margin-top: 2rem;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.result-box-primary {
  background: linear-gradient(135deg, var(--accent-primary-light), var(--bg-secondary));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.result-number {
  font-size: 3rem;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1;
  margin: 0.5rem 0;
}

.result-box-secondary {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.caloric-target {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.caloric-target:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.target-val {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.15rem;
}

/* Video Wrapper */
.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Responsive Menu Panel for Mobile */
@media (max-width: 767px) {
  .main-nav {
    display: none; /* Controlled by js */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
  }
  
  .main-nav.open {
    display: block;
    animation: slideDown 0.3s ease;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: 1rem;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}