/* ===== CSS VARIABLES (Design Tokens) ===== */
:root {
  /* Colors */
  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #252525;
  --color-text-primary: #ffffff;
  --color-text-secondary: #e0e0e0;
  --color-text-muted: #999999;
  --color-accent: #2e7d9e; /* Teal accent for CTAs and highlights */
  --color-accent-light: #3d9db8; /* Lighter teal for hover states */
  --color-gold: #D4A574;        /* Warm gold for featured sections */
  --color-gold-dark: #C49464;   /* Darker gold for hover states */
  --color-coral: #C07E6B;       /* Soft coral for data viz accents */
  --color-coral-light: #D49885; /* Lighter coral for hover */
  --color-border: #333333;
  --color-border-light: #404040;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 48px;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Spacing (4px base unit) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Breakpoints */
  --bp-mobile: 480px;
  --bp-tablet: 768px;
  --bp-desktop: 1024px;

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

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  /* Shadow Variants */
  --shadow-sm-warm: 0 2px 8px rgba(212, 165, 116, 0.15);   /* Gold-tinted subtle */
  --shadow-md-warm: 0 4px 16px rgba(212, 165, 116, 0.2);   /* Gold-tinted medium */
  --shadow-sm-cool: 0 2px 8px rgba(46, 125, 158, 0.15);    /* Teal-tinted subtle */
  --shadow-md-cool: 0 4px 16px rgba(46, 125, 158, 0.2);    /* Teal-tinted medium */
}

/* ===== GLOBAL STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-align: center;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.7;
  letter-spacing: 0.3px;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  background-image: url('https://raspberry-pi-4.tail28066.ts.net/static/svg/starfield.svg?t=1768923388');
  background-attachment: scroll;
  background-size: 100% auto;
  background-repeat: repeat-y;
  background-position: center top;
  overflow-x: hidden;
  text-align: center;
  animation: fadeIn 0.6s ease-out;
  position: relative;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ===== TYPOGRAPHY ===== */
h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.35;
  letter-spacing: 0.5px;  /* Added for elegance */
  margin-bottom: var(--space-md);
  text-align: center;
  color: var(--color-text-primary);
}

h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.35;
  letter-spacing: 0.3px;  /* Added for elegance */
  margin-bottom: var(--space-lg);
  text-align: center;
  color: var(--color-text-primary);
  position: relative;
  padding-bottom: var(--space-md);
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background-color: var(--color-gold);
  opacity: 0;  /* Hidden by default */
}

/* Show underline for featured section h2 */
#featured h2::after,
.featured-section h2::after {
  opacity: 1;
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.4;
  letter-spacing: 0.2px;  /* Added for elegance */
  margin-bottom: var(--space-md);
  text-align: center;
  color: var(--color-text-primary);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 1.8;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

a:hover {
  color: var(--color-accent-light);
  text-shadow: 0 0 8px rgba(46, 125, 158, 0.3);
  border-bottom-color: var(--color-accent);
}

/* Button Styling */
.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-accent);
  color: var(--color-text-primary);
  border: 2px solid var(--color-accent);  /* Add defined border */
  border-radius: 6px;  /* Increased from 4px */
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  cursor: pointer;
}

.btn:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md-cool);  /* Cool teal-tinted shadow */
  text-shadow: none;
}

/* ===== COMPONENTS ===== */

/* Header/Navigation */
header {
  position: sticky;
  top: 0;
  background-color: rgba(26, 26, 26, 0.85);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  padding: var(--space-md);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo-container {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: transform var(--transition-fast);
}

nav .logo-container:hover {
  transform: scale(1.05);
}

nav .logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  min-width: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

nav .logo-icon circle,
nav .logo-icon path {
  stroke: #ffffff !important;
  fill: #ffffff !important;
}

nav .logo-text {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: 0.5px;
  transition: color var(--transition-fast);
}

nav .logo-container:hover .logo-text {
  color: var(--color-text-secondary);
}

/* Homepage nav: Larger logo for first impression */
#homepage-nav .logo-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
}

#homepage-nav .logo-text {
  font-size: 32px;
  letter-spacing: 1px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

nav ul li a {
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  position: relative;
  padding-bottom: 4px;
  display: inline-block;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-gold);
  transition: width var(--transition-fast);
}

nav ul li a:hover {
  color: var(--color-gold);
}

nav ul li a:hover::after {
  width: 100%;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-xl);
  cursor: pointer;
}

@media (max-width: 768px) {
  nav ul {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-bg-secondary);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
  }

  nav ul.active {
    display: flex;
  }

  nav ul li {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .menu-toggle {
    display: block;
  }
}

/* ===== SECTION SPACING ===== */
main {
  padding: var(--space-3xl) var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

main > section {
  margin-bottom: var(--space-3xl);
}

main > section:last-child {
  margin-bottom: 0;
}

section h2 {
  margin-bottom: var(--space-2xl);
}

/* ===== CARD & BOX STYLES ===== */
.card {
  background-color: rgba(37, 37, 37, 0.4);
  border: 1px solid rgba(51, 51, 51, 0.5);
  padding: var(--space-xl);
  border-radius: 6px;  /* Increased from 4px for refined look */
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm-warm);  /* Warm gold-tinted shadow */
  animation: slideInUp 0.6s ease-out 0.1s both;
}

.card:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-gold);  /* Border becomes gold on hover */
  border-top-color: var(--color-gold-dark);  /* Darker gold for emphasis */
  box-shadow: var(--shadow-md-warm);  /* Stronger warm shadow on hover */
  transform: translateY(-4px);
}

.box {
  background-color: rgba(37, 37, 37, 0.4);
  border: 1px solid rgba(51, 51, 51, 0.5);
  padding: var(--space-2xl);
  border-radius: 6px;  /* Increased from 4px */
  box-shadow: var(--shadow-sm-warm);  /* Warm gold-tinted shadow */
  animation: slideInUp 0.6s ease-out both;
  transition: all var(--transition-base);
}

.box:hover {
  border-color: var(--color-gold);
  box-shadow: var(--shadow-md-warm);
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Featured Section Styling */
#featured .box,
.featured-section {
  padding: var(--space-3xl) var(--space-2xl);  /* 40px instead of 32px */
  box-shadow: var(--shadow-md-warm);  /* Stronger shadow for prominence */
  background: linear-gradient(135deg, rgba(37, 37, 37, 0.4) 0%, rgba(42, 42, 42, 0.35) 100%);  /* Subtle gradient */
}

#featured .box h1,
#featured .box h2,
.featured-section h1,
.featured-section h2 {
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-lg);
  display: inline-block;
}

/* ===== GRID ADJUSTMENTS ===== */
.grid {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

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

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

@media (min-width: 1024px) {
  .grid-2 {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* ===== CAROUSEL STYLES ===== */
.carousel {
  display: flex;
  gap: var(--space-xl);
  overflow-x: auto;
  padding: var(--space-md) 0;
  margin-bottom: var(--space-2xl);
  scroll-behavior: smooth;
  /* Center carousel with padding on sides */
  padding-left: max(var(--space-xl), calc((100% - 1200px) / 2));
  padding-right: max(var(--space-xl), calc((100% - 1200px) / 2));
}

/* Hide scrollbar but keep it functional */
.carousel::-webkit-scrollbar {
  height: 6px;
}

.carousel::-webkit-scrollbar-track {
  background: transparent;
}

.carousel::-webkit-scrollbar-thumb {
  background-color: var(--color-gold);
  border-radius: 3px;
  opacity: 0.5;
}

.carousel::-webkit-scrollbar-thumb:hover {
  opacity: 1;
}

/* Firefox scrollbar */
.carousel {
  scrollbar-color: var(--color-gold) transparent;
  scrollbar-width: thin;
}

/* Story cards in carousel get fixed width */
.stories-carousel .card {
  flex: 0 0 calc(100% - var(--space-xl));
  max-width: 400px;
  margin: 0;
}

/* Single card: center it when alone */
.stories-carousel .card:only-child {
  margin: 0 auto;
}

@media (min-width: 768px) {
  .stories-carousel .card {
    flex: 0 0 calc(50% - var(--space-xl));
    max-width: none;
  }
}

@media (min-width: 1024px) {
  .stories-carousel .card {
    flex: 0 0 calc(33.333% - var(--space-xl));
    max-width: none;
  }
}

/* Buttons */
button, .btn {
  background-color: var(--color-accent);
  color: var(--color-text-primary);
  border: 2px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-base);
}

button:hover, .btn:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-md-cool);
  transform: translateY(-2px);
}

/* ===== FORM STYLES ===== */
input, textarea, select {
  width: 100%;
  background-color: rgba(26, 26, 26, 0.5);
  color: var(--color-text-primary);
  border: 1px solid rgba(51, 51, 51, 0.5);
  padding: var(--space-md);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  border-radius: 6px;  /* Increased from 4px */
  margin-bottom: var(--space-md);
  transition: all var(--transition-base);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-gold);
  background-color: #2a2a2a;
  box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.12);  /* Gold glow on focus */
}

input::placeholder {
  color: var(--color-text-muted);
}

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

/* Footer */
footer {
  background: linear-gradient(135deg, rgba(37, 37, 37, 0.35), rgba(31, 31, 31, 0.3));
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-3xl) var(--space-md);
  margin-top: var(--space-3xl);
  position: relative;
}

footer .footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

footer h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
  text-align: center;
  color: var(--color-text-primary);
  position: relative;
  padding-bottom: var(--space-md);
}

footer h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 2px;
  background-color: var(--color-gold);
}

footer ul {
  list-style: none;
}

footer ul li {
  margin-bottom: var(--space-sm);
  text-align: center;
  transition: transform var(--transition-fast);
}

footer ul li:hover {
  transform: scale(1.05);
}

footer ul li a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

footer ul li a:hover {
  color: var(--color-accent);
  text-shadow: none;
  border-bottom-color: transparent;
}

/* Image Styling */
img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  transition: transform var(--transition-base);
}

article img:hover {
  transform: scale(1.02);
}

/* Article/Card Images */
article img {
  display: block;
  margin: 0 auto;
  width: 100%;
}

/* Section Styling */
section {
  animation: fadeIn 0.8s ease-out;
}

/* Utility classes */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

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

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

.py-lg { padding: var(--space-lg) 0; }
.py-xl { padding: var(--space-xl) 0; }

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states */
a:focus, button:focus, input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Dark mode (already default) */
@media (prefers-color-scheme: dark) {
  /* All dark mode is already set as default */
}