/* ============================================
   ASTROWEB — Celestial Observatory Theme
   A Norwegian Astronomy Website
   ============================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400;1,500&family=JetBrains+Mono:wght@300;400;500&family=Outfit:wght@200;300;400;500;600;700&display=swap');

/* --- Custom Properties --- */
:root {
  /* Void palette */
  --void-deepest: #050810;
  --void-deep: #0a0e1a;
  --void-mid: #0f1528;
  --void-surface: #151d35;
  --void-elevated: #1b2545;
  --void-border: #1e2a52;
  --void-border-light: #2a3a6a;

  /* Celestial accents */
  --star-white: #e8edf8;
  --star-blue: #4a9eff;
  --star-blue-glow: #4a9eff40;
  --star-gold: #ffd86b;
  --star-gold-dim: #c9a84c;
  --nebula-purple: #7b5ea7;
  --nebula-rose: #c46b8a;
  --nebula-teal: #3ecfb2;
  --aurora-green: #5bdb7b;

  /* Text */
  --text-primary: #dce3f0;
  --text-secondary: #8e9bbc;
  --text-tertiary: #5c6a8a;
  --text-link: var(--star-blue);
  --text-link-hover: #7dbdff;

  /* Typography */
  --font-display: 'Cormorant Garamond', 'Georgia', serif;
  --font-body: 'Outfit', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --content-width: 820px;
  --wide-width: 1200px;
  --nav-height: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 180ms var(--ease-out);
  --transition-med: 350ms var(--ease-out);
  --transition-slow: 600ms var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 2rem);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--void-deepest);
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Starfield Background --- */
.starfield {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 50%, #0d1a3a 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, #1a0d2e 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, #0a1628 0%, transparent 50%),
    var(--void-deepest);
}

.starfield::before,
.starfield::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 45%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 40% 15%, rgba(255,255,255,0.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 70%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 35%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 85% 60%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 15% 80%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 92% 10%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 5% 55%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 60% 90%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 33% 33%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 77% 88%, rgba(255,255,255,0.5) 0%, transparent 100%);
  animation: starTwinkle 8s ease-in-out infinite alternate;
}

.starfield::after {
  background-image:
    radial-gradient(1px 1px at 18% 62%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 42% 28%, rgba(200,220,255,0.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 68% 52%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 88% 78%, rgba(255,255,200,0.6) 0%, transparent 100%),
    radial-gradient(2px 2px at 50% 50%, rgba(74,158,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 90%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 75% 15%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 8% 40%, rgba(200,200,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 95% 45%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 22% 8%, rgba(255,255,255,0.5) 0%, transparent 100%);
  animation: starTwinkle 11s ease-in-out infinite alternate-reverse;
}

@keyframes starTwinkle {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.7; }
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: linear-gradient(180deg, rgba(5,8,16,0.95) 0%, rgba(10,14,26,0.88) 100%);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid rgba(74,158,255,0.08);
  transition: background var(--transition-med);
}

.nav.scrolled {
  background: rgba(5,8,16,0.97);
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

.nav-inner {
  width: 100%;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  position: relative;
}

.nav-logo-icon::before {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--star-blue), var(--nebula-purple));
  box-shadow: 0 0 12px var(--star-blue-glow);
}

.nav-logo-icon::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--star-gold);
  box-shadow: 0 0 6px var(--star-gold);
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, var(--text-primary), var(--star-blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Desktop Navigation */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0.5rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--star-blue);
}

.nav-link .arrow {
  font-size: 0.6em;
  transition: transform var(--transition-fast);
  opacity: 0.5;
}

.nav-item:hover .nav-link .arrow,
.nav-item.open .nav-link .arrow {
  transform: rotate(180deg);
  opacity: 1;
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  min-width: 200px;
  padding: 8px 0 0.5rem;
  background: rgba(15,21,40,0.97);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid var(--void-border);
  border-radius: 0 0 12px 12px;
  box-shadow:
    0 8px 40px rgba(0,0,0,0.5),
    0 0 1px rgba(74,158,255,0.1);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

/* Invisible bridge so hover doesn't break crossing the gap */
.nav-dropdown::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 0;
  right: 0;
  height: 8px;
}

.nav-item:hover .nav-dropdown,
.nav-item.open .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.nav-dropdown a {
  display: block;
  padding: 0.55rem 1.25rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 300;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-dropdown a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 0;
  background: var(--star-blue);
  border-radius: 1px;
  transition: height var(--transition-fast);
}

.nav-dropdown a:hover {
  color: var(--text-primary);
  background: rgba(74,158,255,0.05);
  padding-left: 1.5rem;
}

.nav-dropdown a:hover::before {
  height: 60%;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all var(--transition-fast);
  transform-origin: center;
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
  background: var(--star-blue);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
  background: var(--star-blue);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 85vh;
  padding: calc(var(--nav-height) + var(--space-3xl)) var(--space-lg) var(--space-3xl);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(74,158,255,0.06) 0%, rgba(123,94,167,0.03) 40%, transparent 70%);
  pointer-events: none;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.15); opacity: 0.7; }
  100% { transform: translate(-50%, -50%) scale(0.95); opacity: 1; }
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--star-blue);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-title em {
  font-style: italic;
  background: linear-gradient(135deg, var(--star-gold), var(--nebula-rose), var(--star-blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  opacity: 0;
  animation: fadeInUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero-divider {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--star-blue), transparent);
  margin-bottom: var(--space-2xl);
  opacity: 0;
  animation: fadeInUp 0.8s var(--ease-out) 0.7s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  background: rgba(74,158,255,0.1);
  border: 1px solid rgba(74,158,255,0.25);
  border-radius: 100px;
  text-decoration: none;
  transition: all var(--transition-med);
  opacity: 0;
  animation: fadeInUp 0.8s var(--ease-out) 0.8s forwards;
}

.hero-cta:hover {
  background: rgba(74,158,255,0.18);
  border-color: rgba(74,158,255,0.45);
  box-shadow: 0 0 30px rgba(74,158,255,0.15);
  transform: translateY(-2px);
}

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

/* --- Section Base --- */
.section {
  padding: var(--space-3xl) var(--space-lg);
}

.section-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--star-gold-dim);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.2;
}

/* --- Card Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.card {
  position: relative;
  background: linear-gradient(145deg, rgba(15,21,40,0.6), rgba(10,14,26,0.8));
  border: 1px solid var(--void-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-med);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--void-border-light);
  transform: translateY(-4px);
  box-shadow:
    0 12px 40px rgba(0,0,0,0.4),
    0 0 0 1px rgba(74,158,255,0.05);
}

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  background: var(--void-mid);
  display: block;
}

.card-image-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--void-mid), var(--void-surface));
  position: relative;
  overflow: hidden;
}

.card-image-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 60%, rgba(255,255,255,0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 20%, rgba(255,255,255,0.25) 0%, transparent 100%);
}

.card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-category {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--star-blue);
  margin-bottom: var(--space-sm);
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

.card:hover .card-title {
  color: var(--star-blue);
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}

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

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.card-arrow {
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
  font-size: 0.85rem;
}

.card:hover .card-arrow {
  color: var(--star-blue);
  transform: translateX(4px);
}

/* Featured card (larger) */
.card-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}

.card-featured .card-image,
.card-featured .card-image-placeholder {
  aspect-ratio: auto;
  height: 100%;
  min-height: 280px;
}

@media (max-width: 700px) {
  .card-featured {
    grid-template-columns: 1fr;
  }
}

/* --- Article Layout --- */
.article {
  padding-top: calc(var(--nav-height) + var(--space-2xl));
  padding-bottom: var(--space-3xl);
}

.article-header {
  text-align: center;
  max-width: var(--content-width);
  margin: 0 auto var(--space-2xl);
  padding: 0 var(--space-lg);
}

.article-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--star-blue);
  margin-bottom: var(--space-md);
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.article-meta {
  font-size: 0.88rem;
  color: var(--text-tertiary);
}

.article-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Article Typography */
.article-content h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-md);
  line-height: 1.25;
}

.article-content h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: var(--space-xl) 0 var(--space-md);
  line-height: 1.3;
}

.article-content h4 {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--star-gold-dim);
  margin: var(--space-lg) 0 var(--space-sm);
  letter-spacing: 0.02em;
}

.article-content p {
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
  font-weight: 300;
}

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

.article-content a {
  color: var(--star-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(74,158,255,0.3);
  transition: all var(--transition-fast);
}

.article-content a:hover {
  color: var(--text-link-hover);
  border-bottom-color: var(--text-link-hover);
}

.article-content strong {
  font-weight: 500;
  color: var(--text-primary);
}

.article-content em {
  font-style: italic;
  color: var(--star-gold-dim);
}

.article-content ul,
.article-content ol {
  margin: 0 0 var(--space-lg) var(--space-lg);
  color: var(--text-primary);
}

.article-content li {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-sm);
}

.article-content ul li::marker {
  color: var(--star-blue);
}

.article-content ol li::marker {
  color: var(--star-gold-dim);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.article-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  border-left: 2px solid var(--star-blue);
  background: rgba(74,158,255,0.03);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.15em 0.5em;
  background: var(--void-surface);
  border: 1px solid var(--void-border);
  border-radius: 4px;
  color: var(--nebula-teal);
}

.article-content pre {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: var(--void-mid);
  border: 1px solid var(--void-border);
  border-radius: 12px;
  overflow-x: auto;
}

.article-content pre code {
  padding: 0;
  background: none;
  border: none;
  font-size: 0.85rem;
  line-height: 1.7;
}

/* --- Images & Figures --- */
.article-content figure,
figure {
  margin: var(--space-xl) 0;
}

.article-content figure img,
figure img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--void-border);
}

figcaption {
  margin-top: var(--space-sm);
  font-size: 0.82rem;
  color: var(--text-tertiary);
  text-align: center;
  font-style: italic;
}

.image-credit {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  opacity: 0.7;
}

/* Wide image */
.figure-wide {
  max-width: calc(var(--content-width) + 200px);
  margin-left: -100px;
  margin-right: -100px;
}

@media (max-width: 1020px) {
  .figure-wide {
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
  }
}

/* --- Tables --- */
.table-wrapper {
  margin: var(--space-xl) 0;
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--void-border);
}

.article-content table,
table.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.article-content table th,
table.spec-table th {
  padding: 0.85rem 1.2rem;
  text-align: left;
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--star-gold-dim);
  background: var(--void-mid);
  border-bottom: 1px solid var(--void-border);
}

.article-content table td,
table.spec-table td {
  padding: 0.75rem 1.2rem;
  border-bottom: 1px solid rgba(30,42,82,0.5);
  color: var(--text-primary);
  font-weight: 300;
}

.article-content table tr:last-child td,
table.spec-table tr:last-child td {
  border-bottom: none;
}

.article-content table tr:hover td,
table.spec-table tr:hover td {
  background: rgba(74,158,255,0.03);
}

table.spec-table td:first-child {
  color: var(--text-secondary);
  font-weight: 400;
  white-space: nowrap;
}

/* --- Breadcrumbs --- */
.breadcrumbs {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-lg) 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.breadcrumbs a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--star-blue);
}

.breadcrumbs .separator {
  opacity: 0.4;
  font-size: 0.65em;
}

.breadcrumbs .current {
  color: var(--text-secondary);
}

/* --- Related Articles --- */
.related-articles {
  max-width: var(--content-width);
  margin: var(--space-3xl) auto 0;
  padding: var(--space-2xl) var(--space-lg) 0;
  border-top: 1px solid var(--void-border);
}

.related-articles h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
}

.related-card {
  display: block;
  padding: var(--space-lg);
  background: rgba(15,21,40,0.4);
  border: 1px solid var(--void-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all var(--transition-med);
}

.related-card:hover {
  border-color: var(--void-border-light);
  background: rgba(15,21,40,0.6);
  transform: translateY(-2px);
}

.related-card-category {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--star-blue);
  margin-bottom: var(--space-xs);
}

.related-card-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.related-card:hover .related-card-title {
  color: var(--star-blue);
}

/* --- Info Box --- */
.info-box {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  background: rgba(74,158,255,0.04);
  border: 1px solid rgba(74,158,255,0.15);
  border-radius: 12px;
}

.info-box.warning {
  background: rgba(255,216,107,0.04);
  border-color: rgba(255,216,107,0.15);
}

.info-box-title {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--star-blue);
  margin-bottom: var(--space-sm);
}

.info-box.warning .info-box-title {
  color: var(--star-gold);
}

/* --- Footer --- */
.footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) var(--space-lg);
  border-top: 1px solid var(--void-border);
  background: linear-gradient(180deg, transparent, rgba(5,8,16,0.5));
}

.footer-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-tertiary);
  line-height: 1.7;
  max-width: 320px;
  margin-top: var(--space-md);
}

.footer h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

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

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

.footer-links a {
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--star-blue);
}

.footer-bottom {
  max-width: var(--wide-width);
  margin: var(--space-2xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--void-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-gold { color: var(--star-gold-dim); }
.text-blue { color: var(--star-blue); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* Constellation SVG container */
.constellation-diagram {
  width: 100%;
  max-width: 600px;
  margin: var(--space-xl) auto;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(10,14,26,0.9) 0%, var(--void-deepest) 100%);
  border-radius: 50%;
  border: 1px solid var(--void-border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.constellation-diagram svg {
  width: 90%;
  height: 90%;
}

/* --- Mobile --- */
@media (max-width: 900px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: calc(var(--nav-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
    background: rgba(8,12,24,0.98);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid var(--void-border);
    transform: translateX(100%);
    transition: transform var(--transition-med);
    overflow-y: auto;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-link {
    padding: 0.75rem 0;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(30,42,82,0.3);
  }

  .nav-dropdown {
    position: static;
    transform: none;
    min-width: auto;
    background: none;
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0 0 0 var(--space-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-item.open .nav-dropdown {
    max-height: 500px;
    opacity: 1;
    transform: none;
  }

  .nav-dropdown a {
    padding: 0.5rem 0;
    font-size: 0.88rem;
  }

  .nav-dropdown a::before {
    display: none;
  }

  .nav-dropdown a:hover {
    background: none;
    padding-left: 0;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

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

@media (max-width: 600px) {
  :root {
    --space-3xl: 3.5rem;
    --space-2xl: 2.5rem;
  }

  .hero {
    min-height: 70vh;
  }

  .article-content h2 {
    font-size: 1.6rem;
  }

  .article-content h3 {
    font-size: 1.25rem;
  }

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

/* --- Print --- */
@media print {
  .nav, .starfield, .footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .article {
    padding-top: 0;
  }
}