/* ============================================
   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);
  font-size: 0.9rem;
  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: 0.75rem 2rem;
  background: transparent;
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.95);
}

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

.nav-links a {
  font-family: var(--font);
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.75rem;
  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: 5rem 2rem 3rem;
  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(1.75rem, 7vw, 4.25rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 0.95;
  margin-bottom: 0;
  position: relative;
  text-transform: uppercase;
}

.hero-line {
  display: block;
}

.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: 2.5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  text-transform: uppercase;
  color: var(--white);
}

/* History */
.history-section {
  padding-top: 3rem;
  padding-bottom: 2rem;
}

.history-section .section-title {
  margin-bottom: 1.25rem;
}

.history-text {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.history-text p {
  width: 100%;
  text-align: left;
  font-size: clamp(0.8rem, 1.5vw, 0.92rem);
  line-height: 1.8;
  font-weight: 300;
}

.history-word {
  color: var(--gray-500);
  transition: color 0.15s ease;
}

.history-word.is-lit {
  color: var(--white);
}

/* Globe — Library in orbit */
/* Book Shelf */
.bookshelf-section {
  padding-top: 1.5rem;
  padding-bottom: 4rem;
}

.bookshelf-section .section-title {
  margin-bottom: 1.25rem;
}

.bookshelf-content {
  display: block;
}

.bookshelf-hint {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 1.5rem;
}

.books-carousel-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  touch-action: pan-x;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  cursor: grab;
  padding: 0.5rem 0 1.5rem;
  scrollbar-width: none; /* Firefox */
}

.books-carousel-viewport::-webkit-scrollbar {
  display: none; /* Safari / Chrome */
}

.books-carousel-viewport.is-dragging {
  cursor: grabbing;
}

.books-carousel {
  display: flex;
  gap: 1.25rem;
  width: max-content;
}

.book-card {
  flex: 0 0 auto;
  width: clamp(140px, 28vw, 200px);
  background: none;
  border: none;
  padding: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font-family: var(--font);
}

.book-cover-wrap {
  aspect-ratio: 9 / 16;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--gray-900);
  transition: border-color 0.22s ease;
}

.book-card.is-active .book-cover-wrap {
  border-color: rgba(255, 255, 255, 0.32);
}

.book-cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-card-title {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  line-height: 1.35;
  color: var(--gray-400);
  transition: color var(--transition);
}

.book-card.is-active .book-card-title {
  color: var(--white);
}

.books-carousel-counter {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.book-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.book-modal[hidden] {
  display: none;
}

.book-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(6px);
}

.book-modal-panel {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  max-height: min(90vh, 860px);
  overflow-y: auto;
  background: var(--gray-900);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.5rem;
}

.book-modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  color: var(--white);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.book-modal-cover-wrap {
  aspect-ratio: 9 / 16;
  width: min(100%, 220px);
  margin: 0 auto 1.25rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.book-modal-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-modal-title {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.book-modal-author {
  font-size: 0.9rem;
  color: var(--gray-400);
  margin-bottom: 1.25rem;
}

.book-modal-notes {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--gray-300);
  white-space: pre-wrap;
}

.book-modal-notes:empty {
  display: none;
}

/* 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);
}

.footer p a {
  color: var(--gray-500);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* 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: 100vh;
    min-height: 100svh; /* small viewport: centre within the always-visible area */
    padding: 2rem 1.5rem 5rem; /* bias the name slightly up from centre */
    justify-content: center;
  }

  .section {
    padding: 2.5rem 1.5rem;
  }

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

  .history-text p {
    font-size: 0.8rem;
    line-height: 1.75;
  }

  .book-card {
    width: clamp(120px, 42vw, 180px);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.25rem;
  }

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