/*
 * Grace Berman - "The Intersection" Design System
 * Where Technology Meets Mental Health
 */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Work+Sans:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* CSS Custom Properties - Design Tokens */
:root {
  /* Colors */
  --color-black: #0a0a0a;
  --color-white: #fafafa;
  --color-violet: #7c3aed;
  --color-cyan: #0891b2;
  --color-gray: #6b7280;
  --color-gray-light: #e5e7eb;
  --color-gray-dark: #374151;

  /* Gradient System */
  --gradient-primary: linear-gradient(135deg, var(--color-violet) 0%, var(--color-cyan) 100%);
  --gradient-hover: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-violet) 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(124, 58, 237, 0.1) 0%, rgba(8, 145, 178, 0.1) 100%);

  /* Typography */
  --font-headline: 'Syne', sans-serif;
  --font-body: 'Work Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

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

  /* Layout */
  --container-width: 1200px;
  --container-narrow: 800px;
  --border-radius: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--color-white);
  color: var(--color-black);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography System */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--space-md);
  font-weight: 400;
}

a {
  color: var(--color-violet);
  text-decoration: none;
  transition: all var(--transition-base);
}

a:hover {
  color: var(--color-cyan);
}

/* Layout Containers */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-light);
}

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

.nav-logo {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-black);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  align-items: center;
}

.nav-link {
  color: var(--color-gray-dark);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Hero Section - Intersection Concept */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-3xl) 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  position: relative;
  z-index: 10;
}

.hero-text h1 {
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: 1.5rem;
  color: var(--color-gray);
  margin-bottom: var(--space-xl);
  font-weight: 300;
}

.hero-image-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
}

/* Intersection Visual - Two Overlapping Circles */
.intersection-visual {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.circle {
  position: absolute;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  mix-blend-mode: multiply;
  opacity: 0.15;
}

.circle-violet {
  background: var(--color-violet);
  left: 0;
  animation: pulse-violet 4s ease-in-out infinite;
}

.circle-cyan {
  background: var(--color-cyan);
  right: 0;
  animation: pulse-cyan 4s ease-in-out infinite;
}

@keyframes pulse-violet {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes pulse-cyan {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(0.95); }
}

.hero-image {
  position: relative;
  z-index: 5;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-white);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* Stats Bar */
.stats-bar {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-lg) 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-gray);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.stat-number {
  font-weight: 600;
  color: var(--color-black);
  font-size: 1rem;
}

/* Two-Track Navigation */
.two-track-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.track-button {
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  border: 2px solid transparent;
  background: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: left;
  display: block;
  text-decoration: none;
}

.track-button h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
  transition: all var(--transition-base);
}

.track-button p {
  color: var(--color-gray);
  font-size: 0.875rem;
  margin: 0;
}

.track-button.violet {
  border-color: var(--color-violet);
}

.track-button.violet:hover {
  background: var(--color-violet);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(124, 58, 237, 0.2);
}

.track-button.cyan {
  border-color: var(--color-cyan);
}

.track-button.cyan:hover {
  background: var(--color-cyan);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(8, 145, 178, 0.2);
}

.track-button:hover h3,
.track-button:hover p {
  color: var(--color-white);
}

/* Gradient Border Cards */
.gradient-card {
  position: relative;
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  background: var(--color-white);
  overflow: hidden;
}

.gradient-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--border-radius-lg);
  padding: 2px;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.gradient-card:hover::before {
  background: var(--gradient-hover);
}

/* Section Styles */
section {
  padding: var(--space-3xl) 0;
}

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

.section-subtitle {
  color: var(--color-gray);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

/* Topic Cards */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.topic-card {
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  background: var(--gradient-subtle);
  border: 1px solid var(--color-gray-light);
  transition: all var(--transition-base);
  cursor: pointer;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: transparent;
  background: var(--gradient-primary);
  color: var(--color-white);
}

.topic-card:hover h3,
.topic-card:hover p {
  color: var(--color-white);
}

.topic-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.topic-card p {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin: 0;
}

/* Article Layout */
.article-header {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-gray-light);
}

.article-meta {
  display: flex;
  gap: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

.article-content {
  padding: var(--space-2xl) 0;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.article-content h2 {
  color: var(--color-violet);
  margin-top: var(--space-xl);
}

.article-content h3 {
  margin-top: var(--space-lg);
}

.article-sidebar {
  position: sticky;
  top: 100px;
  padding: var(--space-lg);
  background: var(--gradient-subtle);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-gray-light);
}

/* Timeline - For About Page */
.timeline {
  position: relative;
  padding: var(--space-xl) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  position: relative;
}

.timeline-item:nth-child(even) .timeline-content {
  grid-column: 2;
}

.timeline-node {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-primary);
  border: 4px solid var(--color-white);
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.timeline-content {
  padding: var(--space-lg);
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  border: 2px solid var(--color-gray-light);
  transition: all var(--transition-base);
}

.timeline-content:hover {
  border-color: transparent;
  background: var(--gradient-subtle);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

/* Credentials Nodes */
.credentials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.credential-node {
  padding: var(--space-md);
  text-align: center;
  border-radius: var(--border-radius);
  background: var(--gradient-subtle);
  border: 2px solid transparent;
  transition: all var(--transition-base);
}

.credential-node:hover {
  border-color: transparent;
  background: var(--gradient-primary);
  color: var(--color-white);
  transform: scale(1.05);
}

.credential-node:hover p {
  color: var(--color-white);
}

.credential-node p {
  margin: 0;
  font-weight: 600;
  font-size: 0.875rem;
}

/* Video Embed */
.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
  margin: var(--space-xl) 0;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
  font-size: 1rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(124, 58, 237, 0.3);
  color: var(--color-white);
}

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

.btn-outline:hover {
  background: var(--color-black);
  color: var(--color-white);
}

/* Footer */
.footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-3xl);
}

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

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

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

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

.footer-section a {
  color: var(--color-gray-light);
  transition: color var(--transition-base);
}

.footer-section a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-dark);
  padding-top: var(--space-lg);
  text-align: center;
  color: var(--color-gray);
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .hero-image-container {
    max-width: 400px;
    margin: 0 auto;
  }

  .nav-menu {
    gap: var(--space-md);
    font-size: 0.875rem;
  }

  .two-track-nav {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    padding-left: var(--space-lg);
  }

  .timeline-node {
    left: 0;
  }

  .timeline-item:nth-child(even) .timeline-content {
    grid-column: 1;
  }

  .stats-bar {
    gap: var(--space-md);
  }
}

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

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }