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

:root {
  --fs-xl: clamp(2.5rem, 5vw, 4rem);
  --fs-lg: 1.5rem;
  --fs-md: 1.1rem;
  --fs-sm: 0.9rem;

  --dark-bg: #0d0d0d;
  --dark-gray: #1a1a1a;
  --primary: #306bac;
  --secondary: #6f9ceb;
  --accent: #918ef4;
  --text-light: #f0f0f0;
  --transition-speed: 0.3s;
}

body {
  font-family: "Inter", sans-serif;
  line-height: 1.6;
  color: var(--text-light);
  background: var(--dark-bg);
}

h1 { font-size: var(--fs-xl); line-height: 1.2; }
h2 { font-size: var(--fs-lg); line-height: 1.3; margin-bottom: 1rem; }
h3 { font-size: var(--fs-md); margin-bottom: 0.5rem; }
p { font-size: var(--fs-md); margin-bottom: 1rem; }
a { color: var(--secondary); text-decoration: none; }
small { font-size: var(--fs-sm); }

.section { padding: 80px 20px; }

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.nav {
  background: var(--dark-gray);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 10px 20px;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo { font-weight: bold; font-size: 1.5rem; }

.nav-links {
  display: grid;
  grid-auto-flow: column;
  gap: 15px;
  list-style: none;
}

.nav-links li a {
  display: block;
  padding: 8px 16px;
  border-radius: 6px;
  background: var(--dark-bg);
  text-align: center;
  font-weight: bold;
  transition: background var(--transition-speed), color var(--transition-speed);
}

.nav-links li a:hover {
  background: var(--primary);
  color: var(--text-light);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 25px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--text-light);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.4), rgba(0,0,0,0.8));
  pointer-events: none;
}

.hero-content {
  position: relative;
  color: var(--text-light);
  text-align: center;
  padding: 0 10px;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: var(--text-light);
  border-radius: 4px;
  font-weight: bold;
  font-size: var(--fs-sm);
  transition: transform var(--transition-speed), background var(--transition-speed);
}

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

.container {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  display: grid;
  gap: 40px;
}

.book-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  background: var(--dark-gray);
  padding: 15px;
  border-radius: 8px;
  align-items: start;
}

.book-card img {
  width: 200px;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
  border: 4px solid var(--primary);
}

.book-info {
  display: grid;
  gap: 10px;
}

.hero-image { display: none; }

footer {
  background: var(--dark-gray);
  color: var(--text-light);
  text-align: center;
  padding: 15px;
  margin-top: 40px;
  border-top: 2px solid var(--primary);
}

@media (max-width: 768px) {
  .nav-links {
    grid-auto-flow: row;
    display: none;
    gap: 10px;
    background: var(--dark-gray);
    position: absolute;
    top: 60px;
    right: 20px;
    width: 180px;
    padding: 10px;
    border-radius: 6px;
  }

  .nav-links.active { display: grid; }
  .nav-toggle { display: flex; }

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

@media (max-width: 600px) {
  .book-card { grid-template-columns: 1fr; }
  .hero-content { padding: 0 10px; }
}
  

.crossword-grid {
  display: grid;
  grid-template-columns: repeat(12, 40px);
  grid-auto-rows: 40px;
  gap: 2px;
}

.cell {
  position: relative;
  border: 1px solid var(--secondary);
  background: var(--dark-gray);
}

.cell input {
  width: 100%;
  height: 100%;
  text-align: center;
  font-weight: bold;
  font-size: 1rem;
  background: transparent;
  border: none;
  color: var(--text-light);
}

.cell-number {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.6rem;
  color: var(--secondary);
}
.crossword-container {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: center;
  margin-top: 20px;
}

.cell.number::before {
  content: attr(data-number);
  position: absolute;
  top: 1px;
  left: 1px;
  font-size: 0.6rem;
  color: var(--accent);
}

.crossword-clues {
  max-width: 300px;
}

.crossword-clues h4 {
  margin-bottom: 5px;
}

.crossword-clues ul {
  list-style: none;
  padding-left: 0;
}

.crossword-clues li {
  margin-bottom: 8px;
}