/* ============================================
   THREADS OF TIME - DESIGN SYSTEM
   Editorial, Institutional, Museum-Grade
   ============================================ */

/* === TYPOGRAPHY === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;500;600;700&display=swap');

/* === CSS VARIABLES === */
:root {
  /* Colors - Neutral, Museum-Grade Palette */
  --color-bg-primary: #FAFAF8;
  --color-bg-secondary: #F5F4F0;
  --color-bg-dark: #2A2A2A;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #3A3A3A;
  --color-text-tertiary: #8A8A8A;
  --color-text-light: #FAFAF8;
  --color-accent-ochre: #C4A574;
  --color-accent-slate: #6B7280;
  --color-accent-terracotta: #B87860;
  --color-border: #E0DED8;
  --color-overlay: rgba(26, 26, 26, 0.03);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing - Editorial Breathing Room */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-width-content: 1200px;
  --max-width-text: 720px;
  --border-radius: 2px;

  /* Transitions */
  --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease;
}

/* === RESET & BASE === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY SCALE === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.25rem;
  font-weight: 500;
}

p {
  margin-bottom: var(--space-md);
  max-width: var(--max-width-text);
}

.lead {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--color-text-primary);
  font-weight: 300;
}

.small-caps {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: var(--color-text-tertiary);
}

/* === LAYOUT COMPONENTS === */
.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-2xl) 0;
  position: relative;
}

.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--color-text-light);
}

.section-dark p {
  color: rgba(250, 250, 248, 0.85);
}

/* === NAVIGATION === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(250, 250, 248, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-smooth);
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
}

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

.nav-link {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  font-weight: 400;
}

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

/* === HERO SECTION === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: var(--space-lg);
}

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

.hero-manifesto {
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-text-primary);
  background-color: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: var(--transition-smooth);
  letter-spacing: 0.02em;
}

.btn:hover {
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
  transform: translateY(-2px);
}

.btn-primary {
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
}

.btn-primary:hover {
  background-color: var(--color-text-secondary);
  border-color: var(--color-text-secondary);
}

/* === CARDS === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  transition: var(--transition-smooth);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(26, 26, 26, 0.08);
}

.card-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  margin-bottom: var(--space-md);
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* === CONVERSATION CARDS === */
.conversation-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background-color: var(--color-bg-primary);
  border-left: 3px solid var(--color-accent-ochre);
  border: 1px solid var(--color-border);
}

.conversation-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.conversation-content h3 {
  margin-bottom: var(--space-sm);
}

.conversation-meta {
  font-size: 0.875rem;
  color: var(--color-accent-ochre);
  margin-bottom: var(--space-md);
  font-weight: 500;
  display: block;
}

/* === THEME CARDS === */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.theme-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  background-color: var(--color-bg-dark);
}

.theme-card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.65;
  transition: var(--transition-smooth);
}

.theme-card:hover .theme-card-image {
  opacity: 0.85;
  transform: scale(1.05);
}

.theme-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md);
  background: linear-gradient(to top, rgba(26, 26, 26, 0.95), transparent);
  color: var(--color-text-light);
}

.theme-card h4 {
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
  font-size: 1.125rem;
}

.theme-card p {
  font-size: 0.875rem;
  color: rgba(250, 250, 248, 0.8);
  margin-bottom: 0;
}

/* === FORMS === */
.form {
  max-width: 600px;
  margin: var(--space-lg) auto;
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.875rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-text-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* === FOOTER === */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--space-xl) 0 var(--space-lg);
  border-top: 1px solid rgba(250, 250, 248, 0.1);
}

.footer-content {
  text-align: center;
}

.footer-mission {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
  color: rgba(250, 250, 248, 0.85);
  font-style: italic;
}

.footer-contact {
  font-size: 0.875rem;
  color: rgba(250, 250, 248, 0.6);
}

.footer-contact a {
  color: var(--color-accent-ochre);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-contact a:hover {
  color: var(--color-text-light);
}

/* === UTILITIES === */
.text-center {
  text-align: center;
}

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

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  .nav-links {
    gap: var(--space-md);
  }

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

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

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

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

/* === SCROLL ANIMATIONS === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  animation: fadeInUp 0.8s ease forwards;
}