/* ============================================
   Konstantin Saifoulline - SpaceX-inspired
   Black, white, minimal, bold
   ============================================ */

:root {
  --black: #000000;
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --accent: #ffffff;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-headline: 'Archivo Black', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

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

body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 1.5rem 2rem;
  background: transparent;
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  font-family: var(--font);
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--white);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 50%, rgba(255,255,255,0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 8vw, 5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 0.95;
  margin-bottom: 0.5rem;
  position: relative;
  text-transform: uppercase;
}

.hero-line {
  display: block;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--gray-400);
  font-weight: 200;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 3rem;
}

.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--gray-200);
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 4rem;
  text-transform: uppercase;
  color: var(--white);
}

/* History / Timeline */
.history-section {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.timeline {
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.2), transparent);
}

.timeline-item {
  position: relative;
  padding-left: 3rem;
  padding-bottom: 4rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: attr(data-year);
  position: absolute;
  left: -0.5rem;
  top: 0.25rem;
  transform: translateX(-100%);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--gray-500);
  text-transform: uppercase;
}

.timeline-content {
  border-left: 2px solid rgba(255, 255, 255, 0.2);
  padding-left: 2rem;
  transition: var(--transition);
}

.timeline-content:hover {
  border-left-color: var(--white);
}

.timeline-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.timeline-content p {
  color: var(--gray-400);
  font-size: 1rem;
  line-height: 1.7;
}

.timeline-highlight {
  color: var(--gray-300) !important;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

/* Book Shelf */
.bookshelf-section {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.bookshelf-section .section-title {
  margin-bottom: 2rem;
}

.bookshelf-toggle {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--white);
  padding: 1.25rem 2rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 2rem;
}

.bookshelf-toggle:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.05);
}

.toggle-arrow {
  transition: transform var(--transition);
  font-size: 1.25rem;
}

.bookshelf-toggle.open .toggle-arrow {
  transform: rotate(180deg);
}

.bookshelf-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.bookshelf-content.open {
  max-height: 2000px;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.book-item {
  padding: 1.25rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.95rem;
  color: var(--gray-400);
  transition: var(--transition);
}

.book-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--white);
}

/* Footer */
.footer {
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.footer-socials a {
  color: var(--gray-500);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition);
}

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

.footer p {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background: var(--black);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    transition: right var(--transition);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: 1.25rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    min-height: auto;
    padding: 6rem 1.5rem 3rem;
    justify-content: flex-start;
    padding-top: 8rem;
  }

  .hero-title {
    margin-bottom: 1.25rem;
  }

  .hero-subtitle {
    margin-bottom: 2rem;
  }

  .section {
    padding: 2.5rem 1.5rem;
  }

  .section-title {
    margin-bottom: 2rem;
  }

  .timeline-item {
    padding-left: 2rem;
  }

  .timeline-item::before {
    position: static;
    transform: none;
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.7rem;
  }

  .timeline-content {
    padding-left: 1rem;
  }

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.5rem;
  }

.footer-socials {
  flex-direction: column;
  gap: 0.75rem;
}
}