/* THE COLD CHAIN ATLAS - Visual System */
:root {
  /* Deep Structural Colors */
  --color-deep-ocean-slate: #17343A;
  --color-harbor-charcoal: #172225;
  --color-cold-ink: #223238;
  
  /* Light Foundations */
  --color-frost-white: #F4F7F4;
  --color-sea-salt: #E8EFEC;
  --color-ice-mist: #DCE9E7;
  --color-pale-shell: #F1E9DD;
  
  /* Cold-Chain Accents */
  --color-glacier-teal: #5D9A9A;
  --color-arctic-mint: #A8C9C2;
  --color-cold-aqua: #8CB9B8;
  --color-harbor-blue: #5C7F8A;
  
  /* Seafood / Warm Accent */
  --color-coral-rust: #C87563;
  --color-shell-copper: #B98570;
  --color-kelp-green: #687C69;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  
  /* Spacing */
  --space-4: 4px;
  --space-8: 8px;
  --space-16: 16px;
  --space-24: 24px;
  --space-40: 40px;
  --space-64: 64px;

  /* Layout */
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-deep-ocean-slate);
  background-color: var(--color-frost-white);
  scroll-behavior: smooth;
}

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

a {
  color: var(--color-glacier-teal);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover, a:focus {
  color: var(--color-harbor-blue);
}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-coral-rust);
  outline-offset: 2px;
}

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

ul {
  list-style: none;
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  color: var(--color-harbor-charcoal);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: var(--space-24); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); margin-bottom: var(--space-16); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); margin-bottom: var(--space-8); }
p { margin-bottom: var(--space-16); }
p:last-child { margin-bottom: 0; }

.text-meta {
  font-size: 0.875rem;
  color: var(--color-harbor-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Layout Classes */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-16);
}

.section {
  padding: var(--space-64) 0;
}

.section-alt {
  background-color: var(--color-sea-salt);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--color-glacier-teal);
  color: var(--color-frost-white);
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--color-harbor-blue);
  color: var(--color-frost-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-deep-ocean-slate);
  border-color: var(--color-glacier-teal);
}

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--color-ice-mist);
}

/* Header & Nav */
.site-header {
  background-color: rgba(244, 247, 244, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-ice-mist);
  position: relative;
  z-index: 100;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-weight: 700;
  color: var(--color-deep-ocean-slate);
  font-size: 1.25rem;
  z-index: 101;
  word-break: break-all;
}

.brand svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  gap: var(--space-24);
  align-items: center;
}

.main-nav a {
  color: var(--color-deep-ocean-slate);
  font-weight: 500;
  font-size: 0.95rem;
}

.main-nav a:hover, .main-nav a[aria-current="page"] {
  color: var(--color-glacier-teal);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-8);
  z-index: 101;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-deep-ocean-slate);
  margin-bottom: 5px;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle span:last-child {
  margin-bottom: 0;
}

.btn-desktop-only { display: inline-flex; }
.btn-mobile-only { display: none; }

/* Responsive Header */
@media (max-width: 900px) {
  .btn-desktop-only { display: none; }
  .btn-mobile-only { display: inline-flex; margin-top: var(--space-24); width: 100%; }
  
  .menu-toggle { display: block; }
  
  .main-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-frost-white);
    flex-direction: column;
    padding: var(--space-24);
    gap: var(--space-16);
    border-bottom: 1px solid var(--color-ice-mist);
    box-shadow: 0 10px 20px rgba(23, 34, 37, 0.1);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
  }
  
  .main-nav.is-visible {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }
  
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* Glass Overlay Card System */
/* STRICT RULE: Image -> Gap -> Content Panel. Never readable text over image. */
.glass-overlay {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
  margin-bottom: var(--space-40);
}

.glass-overlay-image {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 16/9;
  background-color: var(--color-ice-mist);
}

.glass-content-panel {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  padding: var(--space-40);
  box-shadow: 0 8px 32px rgba(23, 34, 37, 0.04);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-40);
  align-items: center;
  padding: var(--space-64) 0;
}

@media (min-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr 1fr;
  }
  .glass-overlay-image { aspect-ratio: 4/3; }
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-40);
}

@media (min-width: 768px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Small Glass Card */
.glass-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
  height: 100%;
}

.glass-card-img {
  width: 100%;
  border-radius: var(--radius-md);
  aspect-ratio: 3/2;
  object-fit: cover;
  background-color: var(--color-sea-salt);
}

.glass-card-panel {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  padding: var(--space-24);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 20px rgba(23, 34, 37, 0.03);
}

.glass-card-panel .btn {
  margin-top: auto;
  align-self: flex-start;
}

/* Process Diagram (SVG/CSS) */
.process-diagram {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
  position: relative;
  padding: var(--space-40) 0;
}

.process-step {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  position: relative;
  z-index: 2;
}

.process-node {
  width: 48px;
  height: 48px;
  background-color: var(--color-frost-white);
  border: 2px solid var(--color-glacier-teal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-deep-ocean-slate);
  font-weight: 700;
  flex-shrink: 0;
}

.process-line {
  position: absolute;
  left: 23px;
  top: 40px;
  bottom: 40px;
  width: 2px;
  background-color: var(--color-ice-mist);
  z-index: 1;
}

@media (min-width: 768px) {
  .process-diagram {
    flex-direction: row;
    justify-content: space-between;
  }
  .process-step {
    flex-direction: column;
    text-align: center;
    width: 14%;
  }
  .process-line {
    left: 40px;
    right: 40px;
    top: 63px;
    bottom: auto;
    width: auto;
    height: 2px;
  }
}

/* Topic Pages Content */
.content-article {
  max-width: 800px;
  margin: 0 auto;
  background: var(--color-frost-white);
  padding: var(--space-40);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-ice-mist);
}

.content-article h2 { margin-top: var(--space-40); }
.content-article h3 { margin-top: var(--space-24); }
.content-article ul {
  margin-bottom: var(--space-16);
  padding-left: var(--space-24);
}
.content-article li {
  margin-bottom: var(--space-8);
  position: relative;
}
.content-article ul li::before {
  content: "•";
  position: absolute;
  left: -20px;
  color: var(--color-glacier-teal);
  font-weight: bold;
}

/* Forms */
.form-group {
  margin-bottom: var(--space-24);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-8);
  color: var(--color-deep-ocean-slate);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-ice-mist);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 1rem;
  background-color: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-glacier-teal);
  box-shadow: 0 0 0 3px rgba(93, 154, 154, 0.2);
}

.form-control.is-invalid {
  border-color: var(--color-coral-rust);
}

.error-message {
  display: none;
  color: var(--color-coral-rust);
  font-size: 0.875rem;
  margin-top: var(--space-4);
}

.form-control.is-invalid + .error-message {
  display: block;
}

.form-success {
  display: none;
  background-color: var(--color-sea-salt);
  border-left: 4px solid var(--color-glacier-teal);
  padding: var(--space-16);
  margin-bottom: var(--space-24);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.form-success.is-visible {
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--color-harbor-charcoal);
  color: var(--color-sea-salt);
  padding: var(--space-64) 0 var(--space-24);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-40);
  margin-bottom: var(--space-40);
}

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

.footer-heading {
  color: var(--color-frost-white);
  font-size: 1.125rem;
  margin-bottom: var(--space-16);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer-links a {
  color: var(--color-ice-mist);
}

.footer-links a:hover {
  color: var(--color-arctic-mint);
}

.footer-bottom {
  border-top: 1px solid var(--color-cold-ink);
  padding-top: var(--space-24);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  font-size: 0.875rem;
  color: var(--color-harbor-blue);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: rgba(23, 34, 37, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-frost-white);
  padding: var(--space-24);
  z-index: 1000;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
}

.cookie-banner.is-visible {
  transform: translateY(0);
}

.cookie-content {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

@media (min-width: 768px) {
  .cookie-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.cookie-actions .btn {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-bottom: var(--space-24);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-ice-mist);
}

th {
  background-color: var(--color-sea-salt);
  font-weight: 600;
  color: var(--color-deep-ocean-slate);
}

/* Static Map Block */
.static-map {
  width: 100%;
  height: 300px;
  background-color: var(--color-sea-salt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-ice-mist);
  margin-bottom: var(--space-24);
  position: relative;
  overflow: hidden;
}

.static-map-grid {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: linear-gradient(var(--color-ice-mist) 1px, transparent 1px), linear-gradient(90deg, var(--color-ice-mist) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.5;
}

.static-map-marker {
  z-index: 2;
  color: var(--color-coral-rust);
  text-align: center;
}