/* ============================================
   HEALTH SUPPLEMENT AFFILIATE WEB APP
   Design System & Global Styles
   ============================================ */

/* === CSS RESET === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* === DESIGN TOKENS === */
:root {
  /* Color Palette - Green Theme */
  --color-primary: #ffffff;
  --color-accent-light: #d4f1e8;
  --color-accent-medium: #4caf50;
  --color-accent-dark: #2d5f32;
  --color-accent-forest: #1a3a1f;

  /* Neutral Colors */
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  --color-background: #ffffff;
  --color-background-light: #f9fafb;
  --color-border: #e0e0e0;

  /* Semantic Colors */
  --color-success: #4caf50;
  --color-error: #dc2626;
  --color-warning: #f59e0b;

  /* Typography */
  --font-primary: "Inter", "Poppins", -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem; /* 36px */
  --font-size-5xl: 3rem; /* 48px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.25rem; /* 4px */
  --spacing-sm: 0.5rem; /* 8px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 1.5rem; /* 24px */
  --spacing-xl: 2rem; /* 32px */
  --spacing-2xl: 3rem; /* 48px */
  --spacing-3xl: 4rem; /* 64px */
  --spacing-4xl: 6rem; /* 96px */

  /* Border Radius */
  --radius-sm: 0.375rem; /* 6px */
  --radius-md: 0.5rem; /* 8px */
  --radius-lg: 0.75rem; /* 12px */
  --radius-xl: 1rem; /* 16px */
  --radius-2xl: 1.5rem; /* 24px */
  --radius-full: 9999px;

  /* Shadows */
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-green: 0 4px 14px 0 rgba(76, 175, 80, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Layout */
  --max-width-content: 1200px;
  --max-width-narrow: 800px;
  --header-height: 70px;
}

/* === BASE STYLES === */
body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-5xl);
}
h2 {
  font-size: var(--font-size-4xl);
}
h3 {
  font-size: var(--font-size-3xl);
}
h4 {
  font-size: var(--font-size-2xl);
}
h5 {
  font-size: var(--font-size-xl);
}
h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-accent-dark);
}

/* === NAVIGATION === */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

.navbar.navbar-secondary {
  background: #e7f7ef !important;
}

.navbar-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  position: relative;
}

.navbar-logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-logo:hover {
  color: var(--color-accent-medium);
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.navbar-nav a {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.navbar-nav a:hover {
  color: var(--color-accent-medium);
}

.navbar-auth {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-left: auto;
}

/* === USER DROPDOWN MENU === */
.user-dropdown {
  position: relative;
}

.user-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border: none;
  background: transparent;
  font-family: var(--font-primary);
}

.user-dropdown-trigger:hover {
  background-color: var(--color-background-light);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-accent-medium);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.user-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.dropdown-arrow {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast);
}

.user-dropdown.active .dropdown-arrow {
  transform: rotate(180deg);
}

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  right: 0;
  min-width: 200px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 1001;
  overflow: hidden;
}

.user-dropdown.active .user-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-item {
  display: block;
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  background: none;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  text-decoration: none;
  font-family: var(--font-primary);
}

.user-dropdown-item:hover {
  background-color: var(--color-background-light);
}

.user-dropdown-item.logout {
  color: var(--color-text-secondary);
}

.user-dropdown-item.logout:hover {
  color: var(--color-error);
  background-color: rgba(220, 38, 38, 0.05);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--spacing-xs) 0;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent-medium);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-accent-medium);
  border: 2px solid var(--color-accent-medium);
}

.btn-secondary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-dark);
  color: var(--color-accent-dark);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-accent-medium);
  color: var(--color-accent-medium);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* === UTILITY CLASSES === */
.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.text-center {
  text-align: center;
}

/* === CARDS === */
.card {
  background: var(--color-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: contain;
  background: var(--color-background-light);
  padding: var(--spacing-md);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.card-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

/* === FORMS === */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-background);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent-medium);
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-light);
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.form-success {
  color: var(--color-success);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

/* === MODALS === */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: var(--spacing-md);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-background-light);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--spacing-xl);
}

/* === GRID LAYOUTS === */
.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* === SECTIONS === */
.section {
  padding: var(--spacing-4xl) 0;
}

.section-light {
  background: var(--color-background-light);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* === HERO SECTION === */
.hero {
  background: linear-gradient(
    135deg,
    var(--color-accent-light) 0%,
    var(--color-primary) 100%
  );
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.hero-title {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent-forest);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* === PRODUCT HIGHLIGHTS === */
.highlight-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-xl);
  background: #f8fcfa;
  border-radius: var(--radius-xl);
}

.highlight-block:last-child {
  margin-bottom: 0;
}

.highlight-block-reverse {
  direction: ltr;
}

.highlight-block-reverse > :first-child {
  order: 1;
}

.highlight-block-reverse > :last-child {
  order: 0;
}

.highlight-content {
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.highlight-quote {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  line-height: 1.3;
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-lg) 0;
  font-style: normal;
  border: none;
  padding: 0;
}

.highlight-attribution {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  font-style: italic;
  margin: 0;
}

.highlight-image-container {
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  max-height: 320px;
}

.highlight-image {
  max-width: 200px;
  max-height: 220px;
  object-fit: contain;
  border-radius: var(--radius-lg);
}

/* Make CircO2 image smaller */
.highlight-block:first-of-type .highlight-image {
  max-width: 160px;
  max-height: 180px;
}

/* === DISCLAIMER === */
.disclaimer-content {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.disclaimer-content p {
  margin-bottom: var(--spacing-md);
}

.disclaimer-content p:last-child {
  margin-bottom: 0;
}

/* === FOOTER === */
.footer {
  background: var(--color-accent-forest);
  color: white;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  color: white;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
}

/* === UTILITIES === */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.mt-sm {
  margin-top: var(--spacing-sm);
}
.mt-md {
  margin-top: var(--spacing-md);
}
.mt-lg {
  margin-top: var(--spacing-lg);
}
.mt-xl {
  margin-top: var(--spacing-xl);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}
.mb-md {
  margin-bottom: var(--spacing-md);
}
.mb-lg {
  margin-bottom: var(--spacing-lg);
}
.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.hidden {
  display: none !important;
}

/* === ANIMATIONS === */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.fade-in-delay-1 {
  animation-delay: 100ms;
}
.fade-in-delay-2 {
  animation-delay: 200ms;
}
.fade-in-delay-3 {
  animation-delay: 300ms;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }

  /* Increase navbar height for mobile */
  .navbar {
    height: 65px;
  }

  .navbar-container {
    padding: 0 var(--spacing-md);
  }

  .navbar-nav {
    gap: var(--spacing-md);
  }

  .navbar-nav a {
    font-size: 0.85rem;
    padding: 0.3rem 0.5rem;
  }

  /* Smaller navbar buttons for mobile */
  .navbar-auth .btn {
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
  }

  /* Hide user name on mobile, show only avatar */
  .user-name {
    display: none;
  }

  .user-dropdown-trigger {
    padding: var(--spacing-xs);
  }

  /* Larger user avatar for mobile */
  .user-avatar {
    width: 38px;
    height: 38px;
    font-size: var(--font-size-base);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* MOBILE HIGHLIGHT SECTION - Amazon-style compact layout */
  .highlight-block,
  .highlight-block-reverse {
    display: flex;
    flex-direction: row;
    gap: 12px;
    padding: 16px 12px;
    align-items: flex-start;
  }

  .highlight-image-container {
    flex: 0 0 100px;
    width: 100px;
    min-height: 100px;
    max-height: 100px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .highlight-image {
    max-width: 95px;
    max-height: 95px;
    width: 100%;
    height: auto;
    object-fit: contain;
  }

  .highlight-block:first-of-type .highlight-image {
    max-width: 85px;
    max-height: 85px;
  }

  .highlight-content {
    flex: 1;
    padding: 0;
    margin: 0;
    min-width: 0;
  }

  .highlight-quote {
    font-size: 0.875rem;
    line-height: 1.25;
    margin: 0 0 4px 0;
    font-weight: 600;
  }

  .highlight-attribution {
    font-size: 0.7rem;
    margin: 0 0 8px 0;
  }

  .highlight-block .btn {
    padding: 6px 12px;
    font-size: 0.75rem;
    margin: 0;
    display: inline-block;
  }

  /* Mobile Navbar - center nav links, auth buttons on right */
  .navbar-container {
    padding: 0 var(--spacing-sm);
    position: relative;
    justify-content: space-between;
  }

  .navbar-nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    gap: var(--spacing-sm);
    margin: 0;
  }

  .navbar-nav a {
    font-size: 0.85rem;
    padding: 0.3rem 0.5rem;
  }

  .navbar-auth {
    margin-left: auto;
    gap: var(--spacing-xs);
    flex-shrink: 0;
    z-index: 1;
  }

  .btn-small {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  /* Hide Login button on mobile to prevent navbar overlap */
  .navbar-auth .btn-outline.auth-only-hide {
    display: none !important;
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }

  .hero {
    padding: var(--spacing-3xl) 0;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .container,
  .container-narrow {
    padding: 0 var(--spacing-sm);
  }

  .modal {
    margin: var(--spacing-sm);
  }
}

/* === USER STATE INDICATORS === */
.user-logged-in .auth-only-hide {
  display: none;
}

.user-logged-out .auth-only-show {
  display: none;
}

/* === LOADING STATE === */
.loading {
  position: relative;
  pointer-events: none;
  opacity: 0.6;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-accent-medium);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* === ALERTS === */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.alert-success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.alert-info {
  background: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}