/* Atlas macOS Editorial - Modern CSS */

:root {
  --color-ink: #1a1a1a;
  --color-paper: #fafafa;
  --color-slate: #4a4a4a;
  --color-mist: #e8e8e8;
  --color-accent: #c94d4d;
  --color-accent-soft: #f5e6e6;
  --color-dark-bg: #0f0f0f;
  --color-warm-gray: #757575;

  --font-display: 'Georgia', 'Times New Roman', serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Consolas', monospace;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-2xl: 12rem;

  --max-width: 1400px;
  --content-width: 680px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 5rem);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: 1.5em;
  max-width: 65ch;
}

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

a:hover {
  opacity: 0.7;
}

/* Navigation */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-mist);
}

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

.nav-brand {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-ink);
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav-links a {
  color: var(--color-slate);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.nav-links a:hover {
  color: var(--color-ink);
  opacity: 1;
}

/* Hero Sections */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  padding-top: calc(var(--space-xl) + 60px);
}

.hero-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

@media (min-width: 900px) {
  .hero-split {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
  }
}

.hero-text {
  max-width: 600px;
}

.hero-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-warm-gray);
  margin-bottom: var(--space-sm);
}

.hero-title {
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-slate);
  line-height: 1.8;
}

.hero-image {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 4px;
}

/* Page Header */
.page-header {
  padding: calc(var(--space-xl) + 60px) var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-header-narrow {
  max-width: var(--content-width);
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

.page-meta {
  font-size: 0.85rem;
  color: var(--color-warm-gray);
  margin-top: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Content Sections */
.content-section {
  padding: var(--space-lg) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.content-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* Editorial Grid */
.editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 900px) {
  .editorial-grid {
    grid-template-columns: 1fr 1fr;
  }

  .editorial-grid.offset-left {
    grid-template-columns: 1.5fr 1fr;
  }

  .editorial-grid.offset-right {
    grid-template-columns: 1fr 1.5fr;
  }
}

.editorial-grid-item {
  padding: var(--space-md) 0;
}

/* Pull Quotes */
.pull-quote {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.4;
  color: var(--color-ink);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
}

.pull-quote cite {
  display: block;
  font-size: 0.9rem;
  font-style: normal;
  color: var(--color-warm-gray);
  margin-top: var(--space-sm);
  font-family: var(--font-body);
}

/* Callout Blocks */
.callout {
  background: var(--color-mist);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  border-radius: 4px;
}

.callout-accent {
  background: var(--color-accent-soft);
  border-left: 4px solid var(--color-accent);
}

.callout-dark {
  background: var(--color-dark-bg);
  color: var(--color-paper);
}

.callout-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-xs);
  color: var(--color-warm-gray);
}

/* Feature Cards */
.feature-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.feature-card {
  padding: var(--space-md);
  background: white;
  border: 1px solid var(--color-mist);
  border-radius: 4px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.feature-card h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-slate);
  margin: 0;
}

/* Content Images */
.content-image {
  width: 100%;
  margin: var(--space-lg) 0;
  border-radius: 4px;
}

.content-image-caption {
  font-size: 0.8rem;
  color: var(--color-warm-gray);
  margin-top: var(--space-xs);
  text-align: center;
}

/* Full-Width Section */
.full-width-section {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding: var(--space-xl) var(--space-md);
}

.full-width-dark {
  background: var(--color-dark-bg);
  color: var(--color-paper);
}

.full-width-mist {
  background: var(--color-mist);
}

/* Dividers */
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-lg) 0;
}

.section-divider-center {
  margin-left: auto;
  margin-right: auto;
}

/* Timeline (Special Page) */
.timeline {
  position: relative;
  padding: var(--space-lg) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-mist);
}

@media (min-width: 768px) {
  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  padding-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .timeline-item {
    width: 50%;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .timeline-item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .timeline-item:nth-child(even) {
    margin-left: 50%;
    text-align: left;
  }
}

.timeline-marker {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 3px solid var(--color-paper);
}

@media (min-width: 768px) {
  .timeline-item:nth-child(odd) .timeline-marker {
    right: calc(-9px - var(--space-lg));
    left: auto;
  }

  .timeline-item:nth-child(even) .timeline-marker {
    left: calc(-9px - var(--space-lg));
  }
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.timeline-content h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.1rem;
}

.timeline-content p {
  font-size: 0.95rem;
  color: var(--color-slate);
}

/* Navigation Links (Internal) */
.internal-links {
  padding: var(--space-lg) var(--space-md);
  max-width: var(--content-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-mist);
}

.internal-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
  color: var(--color-slate);
  margin-right: var(--space-md);
  margin-bottom: var(--space-xs);
}

.internal-link:hover {
  color: var(--color-accent);
  opacity: 1;
}

/* Footer */
.site-footer {
  padding: var(--space-xl) var(--space-md);
  background: var(--color-dark-bg);
  color: var(--color-paper);
  margin-top: var(--space-xl);
}

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

.footer-section h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
  color: var(--color-warm-gray);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-xs);
}

.footer-section a {
  color: var(--color-paper);
  font-size: 0.9rem;
}

.footer-section a:hover {
  color: var(--color-accent);
  opacity: 1;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8rem;
  color: var(--color-warm-gray);
}

/* Concept Map */
.concept-map {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
}

@media (max-width: 768px) {
  .concept-map {
    grid-template-columns: 1fr 1fr;
  }
}

.concept-node {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-sm);
  background: white;
  border: 2px solid var(--color-mist);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.concept-node:hover {
  border-color: var(--color-accent);
  transform: scale(1.05);
}

.concept-node.central {
  grid-column: 2;
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.concept-node h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
}

.concept-node p {
  font-size: 0.7rem;
  margin: 0;
  margin-top: 4px;
  color: var(--color-warm-gray);
}

.concept-node.central p {
  color: rgba(255, 255, 255, 0.8);
}

/* Responsive adjustments */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  .content-section {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
}

/* Number highlights */
.stat-block {
  text-align: center;
  padding: var(--space-md);
}

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 1;
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-warm-gray);
  margin-top: var(--space-xs);
}

/* List styles */
.styled-list {
  list-style: none;
  padding-left: 0;
}

.styled-list li {
  position: relative;
  padding-left: 1.5em;
  margin-bottom: 0.8em;
}

.styled-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Mobile nav toggle placeholder */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 600px) {
  .nav-toggle {
    display: block;
  }
}