/* ==========================================================================
   VENUS FACTOR — HIGH-PERFORMANCE DESIGN SYSTEM
   Modern, accessible, SEO-optimized, zero-framework vanilla CSS
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand Palette */
  --color-brand-primary: #0e3b3c;       /* Deep Ocean Teal */
  --color-brand-primary-light: #185a5b;
  --color-brand-accent: #2aa8a7;        /* Aqua Teal Accent */
  --color-brand-accent-hover: #228a89;
  --color-brand-secondary: #e76f51;     /* Warm Coral */
  --color-brand-secondary-hover: #d35a3c;
  --color-brand-gold: #e9c46a;          /* Soft Gold / Stars */
  
  /* Neutrals & Surfaces */
  --color-bg-main: #ffffff;
  --color-bg-sand: #faf7f0;             /* Warm Sand Canvas */
  --color-bg-panel: #f2ede4;            /* Soft Sand Panel */
  --color-bg-card: #ffffff;
  --color-border: #e2dbcd;
  --color-border-subtle: #eee9dd;
  
  /* Text & Ink */
  --color-text-main: #1d2625;           /* Deep Charcoal Ink */
  --color-text-muted: #566462;          /* Muted Slate */
  --color-text-light: #80908e;
  --color-text-inverse: #ffffff;
  
  /* Functional / Status */
  --color-success-bg: #e8f5e9;
  --color-success-border: #a5d6a7;
  --color-success-text: #1b5e20;
  --color-warning-bg: #fff8e1;
  --color-warning-border: #ffe082;
  --color-warning-text: #e65100;
  --color-info-bg: #e0f2f1;
  --color-info-border: #80cbc4;
  --color-info-text: #004d40;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Sizing & Spacing */
  --max-width-content: 1180px;
  --max-width-narrow: 840px;
  --max-width-wide: 1280px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(14, 59, 60, 0.05);
  --shadow-md: 0 8px 24px -6px rgba(14, 59, 60, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 40px -12px rgba(14, 59, 60, 0.12), 0 4px 12px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg-sand);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--color-bg-sand);
}

img, picture, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-brand-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw + 0.5rem, 3rem); margin-bottom: var(--space-4); }
h2 { font-size: clamp(1.6rem, 2.5vw + 0.5rem, 2.2rem); margin-top: var(--space-8); margin-bottom: var(--space-4); }
h3 { font-size: clamp(1.25rem, 1.8vw + 0.2rem, 1.5rem); margin-top: var(--space-6); margin-bottom: var(--space-3); }
h4 { font-size: 1.15rem; margin-top: var(--space-4); margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  font-size: 1.05rem;
  color: var(--color-text-main);
}

ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
  font-size: 1.05rem;
}

button, input, textarea, select {
  font: inherit;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-brand-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 10000;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-brand-accent);
}

/* --------------------------------------------------------------------------
   3. Layout & Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-narrow {
  max-width: var(--max-width-narrow);
}

.container-wide {
  max-width: var(--max-width-wide);
}

.section-py {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section-py-lg {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.bg-white { background-color: var(--color-bg-main); }
.bg-sand { background-color: var(--color-bg-sand); }
.bg-panel { background-color: var(--color-bg-panel); }
.bg-dark { background-color: var(--color-brand-primary); color: var(--color-text-inverse); }

.grid {
  display: grid;
  gap: var(--space-6);
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.text-center { text-align: center; }

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(14, 59, 60, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(42, 168, 167, 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-text-inverse);
  letter-spacing: -0.01em;
  text-decoration: none;
}
.brand-logo:hover {
  text-decoration: none;
  color: var(--color-text-inverse);
}
.brand-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-brand-accent), #38ef7d);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 1.1rem;
}
.brand-tm {
  font-size: 0.65rem;
  color: var(--color-brand-accent);
  vertical-align: super;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.88);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-brand-accent);
  border-radius: var(--radius-full);
}

.nav-cta-btn {
  background-color: var(--color-brand-accent);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1.25rem !important;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.nav-cta-btn:hover {
  background-color: var(--color-brand-accent-hover);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.2rem;
  line-height: 1;
}

@media (max-width: 991px) {
  .mobile-menu-toggle {
    display: block;
  }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-brand-primary);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6) var(--space-6);
    gap: var(--space-4);
    border-bottom: 2px solid var(--color-brand-accent);
    display: none;
  }
  .nav-links.is-open {
    display: flex;
  }
  .nav-links li {
    width: 100%;
    margin-bottom: 0;
  }
  .nav-links a {
    display: block;
    width: 100%;
    font-size: 1.1rem;
    padding: var(--space-2) 0;
  }
  .nav-cta-btn {
    display: inline-block;
    margin-top: var(--space-2);
  }
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(145deg, #092c2d 0%, #0e3b3c 60%, #154c4d 100%);
  color: var(--color-text-inverse);
  padding: var(--space-12) 0 var(--space-16);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 24px;
  background: var(--color-bg-sand);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-10);
  align-items: center;
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background-color: rgba(42, 168, 167, 0.2);
  border: 1px solid rgba(42, 168, 167, 0.4);
  color: #a4f4f3;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.hero h1 {
  color: #ffffff;
  font-size: clamp(2.2rem, 3.8vw + 0.5rem, 3.2rem);
  font-weight: 800;
  margin-bottom: var(--space-5);
  line-height: 1.18;
}

.hero-lead {
  font-size: 1.18rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.65;
  margin-bottom: var(--space-6);
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
@media (max-width: 860px) {
  .hero-cta-group {
    justify-content: center;
  }
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
@media (max-width: 860px) {
  .hero-badges {
    justify-content: center;
  }
}

.hero-badge-pill {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  color: #fff;
}

.hero-image-wrap {
  position: relative;
  text-align: center;
}
.hero-image-wrap img {
  margin: 0 auto;
  filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.3));
  max-height: 420px;
  object-fit: contain;
}

/* Stat Bar */
.stat-bar {
  background-color: var(--color-bg-panel);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) 0;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  text-align: center;
}
@media (max-width: 680px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}
.stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-brand-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.stat-label {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   6. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  line-height: 1.2;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background-color: var(--color-brand-accent);
  color: #ffffff;
}
.btn-primary:hover {
  background-color: var(--color-brand-accent-hover);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(42, 168, 167, 0.4);
}

.btn-secondary {
  background-color: var(--color-brand-secondary);
  color: #ffffff;
}
.btn-secondary:hover {
  background-color: var(--color-brand-secondary-hover);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(231, 111, 81, 0.4);
}

.btn-outline-light {
  background-color: transparent;
  border-color: rgba(255, 255, 255, 0.5);
  color: #ffffff;
}
.btn-outline-light:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: #ffffff;
  color: #ffffff;
}

.btn-outline-dark {
  background-color: transparent;
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}
.btn-outline-dark:hover {
  background-color: var(--color-brand-primary);
  color: #ffffff;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
}
.badge-primary { background-color: var(--color-info-bg); color: var(--color-info-text); }
.badge-secondary { background-color: #fbeae5; color: #b73d22; }
.badge-success { background-color: var(--color-success-bg); color: var(--color-success-text); }

/* --------------------------------------------------------------------------
   7. Cards & Modules
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

.card-tint {
  background-color: var(--color-bg-panel);
  border-color: var(--color-border);
}

.eyebrow {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-brand-accent-hover);
  margin-bottom: var(--space-2);
}

.lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Feature & Mechanism Cards */
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  position: relative;
  display: flex;
  flex-direction: column;
}
.feature-card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
  color: var(--color-brand-accent);
}
.feature-card h3 {
  margin-top: 0;
  font-size: 1.25rem;
}
.feature-card p {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  flex-grow: 1;
}

/* Ingredient Grid Cards */
.ingredient-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.ingredient-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.ingredient-card-img-wrap {
  background: #fbf9f4;
  padding: var(--space-6);
  text-align: center;
  border-bottom: 1px solid var(--color-border-subtle);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ingredient-card-img-wrap img {
  max-height: 160px;
  object-fit: contain;
  margin: 0 auto;
}
.ingredient-card-body {
  padding: var(--space-6);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.ingredient-card-body h3 {
  margin-top: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: 1.3rem;
}
.ingredient-card-body p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  flex-grow: 1;
}
.ingredient-card-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-3);
}

/* Review / Customer Perspective Cards */
.review-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
}
.review-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
}
.review-avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
}
.review-author {
  font-weight: 700;
  color: var(--color-brand-primary);
  line-height: 1.2;
}
.review-location {
  font-size: 0.85rem;
  color: var(--color-text-light);
}
.review-stars {
  color: var(--color-brand-gold);
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: var(--space-3);
}
.review-body {
  font-style: italic;
  font-size: 0.98rem;
  color: var(--color-text-main);
  flex-grow: 1;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   8. AEO Direct-Answer & Callout Blocks
   -------------------------------------------------------------------------- */
.aeo-direct-answer {
  background-color: #f0f7f7;
  border-left: 4px solid var(--color-brand-accent);
  padding: var(--space-5) var(--space-6);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-4) 0 var(--space-6);
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--color-brand-primary);
  font-weight: 500;
}
.aeo-direct-answer p {
  margin-bottom: 0;
  color: inherit;
  font-size: inherit;
}

.alert-box {
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-md);
  margin: var(--space-6) 0;
  border: 1px solid transparent;
}
.alert-warning {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: #793802;
}
.alert-info {
  background-color: var(--color-info-bg);
  border-color: var(--color-info-border);
  color: var(--color-info-text);
}
.alert-box h4 {
  margin-top: 0;
  margin-bottom: var(--space-2);
  color: inherit;
}
.alert-box p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   9. Tables & Comparison Grids
   -------------------------------------------------------------------------- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: var(--space-6) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.98rem;
}

th, td {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

th {
  background-color: var(--color-bg-panel);
  color: var(--color-brand-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: #faf8f3;
}

/* --------------------------------------------------------------------------
   10. FAQ Accordions (HTML <details> Native + Accessible)
   -------------------------------------------------------------------------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

details.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

details.faq-item[open] {
  border-color: var(--color-brand-accent);
  box-shadow: var(--shadow-sm);
}

summary.faq-question {
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-brand-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  user-select: none;
}
summary.faq-question::-webkit-details-marker {
  display: none;
}

summary.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-brand-accent);
  font-weight: 400;
  transition: transform var(--transition-fast);
}

details.faq-item[open] summary.faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-6) var(--space-6);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-4);
}
.faq-answer p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   11. Breadcrumbs & Table of Contents (TOC)
   -------------------------------------------------------------------------- */
.breadcrumbs {
  padding: var(--space-4) 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-size: inherit;
}
.breadcrumbs li + li::before {
  content: '/';
  color: var(--color-border);
}
.breadcrumbs a {
  color: var(--color-brand-primary);
}
.breadcrumbs [aria-current="page"] {
  color: var(--color-text-muted);
  font-weight: 600;
}

.toc-card {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
}
.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.toc-list a {
  color: var(--color-brand-primary);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-block;
}
.toc-list a:hover {
  color: var(--color-brand-accent-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   12. Article & Longform Typography
   -------------------------------------------------------------------------- */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.75;
}
.article-body h2 {
  scroll-margin-top: 90px;
}
.article-body h3 {
  scroll-margin-top: 90px;
}

/* --------------------------------------------------------------------------
   13. Pricing & Packages
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  align-items: stretch;
  margin: var(--space-8) 0;
}
@media (max-width: 900px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
}

.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid var(--color-brand-secondary);
  background: linear-gradient(180deg, #fffaf8 0%, #ffffff 100%);
  box-shadow: var(--shadow-md);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-brand-secondary);
  color: #fff;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.pricing-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}
.pricing-supply {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.pricing-image {
  max-height: 180px;
  margin: 0 auto var(--space-4);
  object-fit: contain;
}
.pricing-price {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-brand-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.pricing-unit {
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 500;
}
.pricing-total {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-6);
}
.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-8);
  flex-grow: 1;
  text-align: left;
}
.pricing-features li {
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.pricing-features li::before {
  content: '✓';
  color: var(--color-brand-accent);
  font-weight: 900;
}

/* --------------------------------------------------------------------------
   14. Author & E-E-A-T Blocks
   -------------------------------------------------------------------------- */
.author-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
  margin: var(--space-8) 0;
}
@media (max-width: 600px) {
  .author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}
.author-avatar-lg {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: var(--color-bg-panel);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  flex-shrink: 0;
}
.author-info h4 {
  margin-top: 0;
  margin-bottom: var(--space-1);
  font-size: 1.25rem;
}
.author-role {
  font-size: 0.88rem;
  color: var(--color-brand-accent-hover);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.author-bio {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   15. Contact Form
   -------------------------------------------------------------------------- */
.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}
.form-group {
  margin-bottom: var(--space-5);
}
.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: var(--space-2);
  color: var(--color-brand-primary);
}
.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: #ffffff;
  color: var(--color-text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-brand-accent);
  box-shadow: 0 0 0 3px rgba(42, 168, 167, 0.2);
}
textarea.form-control {
  min-height: 140px;
  resize: vertical;
}

/* --------------------------------------------------------------------------
   16. Scientific References & Bibliography
   -------------------------------------------------------------------------- */
.reference-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  font-size: 0.95rem;
  line-height: 1.55;
}
.reference-item strong {
  color: var(--color-brand-primary);
  display: block;
  margin-bottom: var(--space-1);
}
.reference-item .ref-doi {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: block;
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   17. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-brand-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: auto;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 500px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: var(--space-4);
  font-family: var(--font-display);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-brand-accent);
  text-decoration: underline;
}

.footer-disclaimer-box {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
}
.footer-disclaimer-box h5 {
  color: #ffffff;
  font-size: 0.95rem;
  margin-top: 0;
  margin-bottom: var(--space-2);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

/* Scroll To Top Floating Button */
.scroll-top-btn {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background-color: var(--color-brand-accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-fast);
  z-index: 900;
}
.scroll-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
}
.scroll-top-btn:hover {
  background-color: var(--color-brand-accent-hover);
  transform: translateY(-2px);
}