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

:root{
  --bg:#0a0a0f;
  --bg-card:#12121a;
  --bg-nav:#0a0a0fdd;
  --accent:#00e0ff;
  --accent-dim:#007a8a;
  --text:#e0e0e8;
  --text-muted:#8888a0;
  --font-body:'Inter',system-ui,-apple-system,sans-serif;
  --font-heading:'Orbitron',var(--font-body);
  --max-w:1140px;
  --transition:.3s ease;
}

html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
}
a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:#fff}
img{max-width:100%;display:block}

/* ===== UTILITY ===== */
.container{width:90%;max-width:var(--max-w);margin:0 auto}
.section{padding:100px 0}
.section-title{
  font-family:var(--font-heading);
  font-size:clamp(1.6rem,4vw,2.4rem);
  text-transform:uppercase;
  letter-spacing:.12em;
  margin-bottom:1rem;
  color:#fff;
}
.section-title span{color:var(--accent)}
.section-subtitle{color:var(--text-muted);max-width:600px;margin-bottom:3rem}
.btn{
  display:inline-block;
  padding:.85rem 2.2rem;
  border:1px solid var(--accent);
  color:var(--accent);
  font-family:var(--font-heading);
  font-size:.8rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  border-radius:2px;
  transition:all var(--transition);
  cursor:pointer;
  background:transparent;
}
.btn:hover{background:var(--accent);color:var(--bg)}
.btn-solid{background:var(--accent);color:var(--bg)}
.btn-solid:hover{background:#fff;border-color:#fff;color:var(--bg)}

/* ===== NAV ===== */
.nav{
  position:fixed;top:0;left:0;width:100%;z-index:1000;
  background:var(--bg-nav);
  backdrop-filter:blur(12px);
  border-bottom:1px solid #ffffff08;
  transition:background var(--transition);
}
.nav .container{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.nav-logo{
  font-family:var(--font-heading);
  font-size:1.15rem;
  letter-spacing:.2em;
  color:#fff;
  text-transform:uppercase;
}
.nav-logo span{color:var(--accent)}
.nav-links{display:flex;gap:2rem;list-style:none}
.nav-links a{
  font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-muted);
  position:relative;
}
.nav-links a::after{
  content:'';position:absolute;bottom:-4px;left:0;width:0;height:1px;
  background:var(--accent);transition:width var(--transition);
}
.nav-links a:hover,
.nav-links a.active{color:var(--accent)}
.nav-links a:hover::after,
.nav-links a.active::after{width:100%}

/* hamburger */
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.hamburger span{display:block;width:24px;height:2px;background:var(--text);transition:all var(--transition)}
.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ===== HERO ===== */
.hero{
  min-height:100vh;display:flex;align-items:center;
  position:relative;overflow:hidden;
  padding-top:72px;
}
.hero-bg{
  position:absolute;inset:0;
  background:
    radial-gradient(ellipse at 20% 50%,#00e0ff10 0%,transparent 60%),
    radial-gradient(ellipse at 80% 20%,#6b00ff10 0%,transparent 50%),
    linear-gradient(180deg,#0a0a0f 0%,#0d0d18 100%);
}
.hero-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(#ffffff06 1px,transparent 1px),
    linear-gradient(90deg,#ffffff06 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse at center,black 30%,transparent 70%);
}
.hero .container{position:relative;z-index:1}
.hero-content{max-width:680px}
.hero-tag{
  display:inline-block;
  font-family:var(--font-heading);
  font-size:.7rem;
  letter-spacing:.25em;
  text-transform:uppercase;
  color:var(--accent);
  border:1px solid var(--accent-dim);
  padding:.4rem 1.2rem;
  margin-bottom:1.5rem;
  border-radius:2px;
}
.hero h1{
  font-family:var(--font-heading);
  font-size:clamp(2rem,6vw,3.8rem);
  line-height:1.15;
  color:#fff;
  margin-bottom:1.2rem;
  text-transform:uppercase;
  letter-spacing:.05em;
}
.hero h1 span{color:var(--accent)}
.hero p{
  font-size:1.1rem;color:var(--text-muted);
  max-width:520px;margin-bottom:2.5rem;
}
.hero-buttons{display:flex;gap:1rem;flex-wrap:wrap}

/* glitch scanline effect */
.hero::after{
  content:'';position:absolute;inset:0;
  background:repeating-linear-gradient(
    0deg,transparent,transparent 2px,#00e0ff03 2px,#00e0ff03 4px
  );
  pointer-events:none;
}

/* ===== ABOUT ===== */
.about-grid{
  display:grid;
  grid-template-columns:300px 1fr;
  gap:3rem;
  align-items:start;
}
.about-image{
  position:relative;
  border-radius:4px;
  overflow:hidden;
}
.about-image-placeholder{
  width:100%;
  aspect-ratio:3/4;
  background:linear-gradient(135deg,var(--bg-card),#1a1a2e);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);
  font-size:4rem;
  color:var(--accent-dim);
  border:1px solid #ffffff10;
  border-radius:4px;
}
.about-image::after{
  content:'';position:absolute;inset:0;
  border:1px solid var(--accent-dim);
  border-radius:4px;
  transform:translate(12px,12px);
  z-index:-1;
}
.about-text h3{
  font-family:var(--font-heading);
  font-size:1rem;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.15em;
  margin:2rem 0 .5rem;
}
.about-text h3:first-of-type{margin-top:0}
.about-text p{color:var(--text-muted);margin-bottom:1rem}
.about-subseries{
  font-family:var(--font-heading);
  font-size:.85rem;
  color:#fff;
  text-transform:uppercase;
  letter-spacing:.1em;
  margin:1.5rem 0 .4rem;
}
.about-list{
  list-style:none;
  margin:.5rem 0 1rem;
  padding:0;
}
.about-list li{
  color:var(--text-muted);
  padding-left:1.2rem;
  position:relative;
  margin-bottom:.3rem;
}
.about-list li::before{
  content:'';
  position:absolute;left:0;top:.65em;
  width:6px;height:6px;
  background:var(--accent-dim);
  border-radius:1px;
}
.about-stats{
  display:flex;gap:2.5rem;margin-top:2rem;
  padding-top:2rem;border-top:1px solid #ffffff10;
}
.about-stats div{text-align:center}
.about-stats strong{
  display:block;font-family:var(--font-heading);
  font-size:1.8rem;color:var(--accent);
}
.about-stats span{font-size:.75rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em}

/* ===== BOOKS ===== */
.books-filter{
  display:flex;gap:.8rem;flex-wrap:wrap;margin-bottom:3rem;
}
.books-filter button{
  padding:.5rem 1.4rem;
  background:transparent;
  border:1px solid #ffffff15;
  color:var(--text-muted);
  font-family:var(--font-body);
  font-size:.82rem;
  cursor:pointer;
  border-radius:2px;
  transition:all var(--transition);
}
.books-filter button:hover,
.books-filter button.active{
  border-color:var(--accent);color:var(--accent);
}

.books-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:2rem;
}
.book-card{
  background:var(--bg-card);
  border:1px solid #ffffff08;
  border-radius:4px;
  overflow:hidden;
  transition:all var(--transition);
  position:relative;
}
.book-card:hover{
  transform:translateY(-6px);
  border-color:var(--accent-dim);
  box-shadow:0 20px 60px -20px #00e0ff15;
}
.book-cover{
  width:100%;
  aspect-ratio:2/3;
  position:relative;
  perspective:800px;
}
.book-cover-inner{
  width:100%;
  height:100%;
  position:relative;
  transition:transform .6s ease;
  transform-style:preserve-3d;
}
.book-cover.flipped .book-cover-inner{
  transform:rotateY(180deg);
}
.book-cover-front,
.book-cover-back{
  position:absolute;
  inset:0;
  backface-visibility:hidden;
  overflow:hidden;
}
.book-cover-back{
  transform:rotateY(180deg);
}
.book-cover img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transition:transform var(--transition);
}
.book-card:hover .book-cover img{
  transform:scale(1.03);
}
/* flip toggle corner */
.book-lang-toggle{
  position:absolute;
  top:0;right:0;
  z-index:5;
  width:44px;height:44px;
  cursor:pointer;
  background:none;
  border:none;
  padding:0;
}
.book-lang-toggle::before{
  content:'';
  position:absolute;top:0;right:0;
  border-style:solid;
  border-width:0 44px 44px 0;
  border-color:transparent var(--accent) transparent transparent;
  opacity:.85;
  transition:opacity var(--transition);
}
.book-lang-toggle:hover::before{
  opacity:1;
}
.book-lang-toggle span{
  position:absolute;
  top:5px;right:4px;
  font-size:.6rem;
  font-weight:700;
  color:var(--bg);
  text-transform:uppercase;
  letter-spacing:.02em;
  line-height:1;
  pointer-events:none;
}
/* no-flip cards (no Czech version) — just wrap img normally */
.book-cover:not(:has(.book-cover-inner)) {
  overflow:hidden;
}
/* coming soon badge */
.book-badge-upcoming{
  position:absolute;
  top:16px;left:-36px;
  width:160px;
  text-align:center;
  padding:6px 0;
  background:var(--accent);
  color:var(--bg);
  font-family:var(--font-heading);
  font-size:.6rem;
  font-weight:700;
  letter-spacing:.15em;
  text-transform:uppercase;
  transform:rotate(-45deg);
  z-index:5;
  box-shadow:0 2px 8px #00000060;
}
.book-card--upcoming .book-cover img{
  filter:brightness(.6);
}
.book-info{padding:1.5rem}
.book-info .book-series{
  font-size:.7rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:.4rem;
}
.book-info h3{
  font-family:var(--font-heading);
  font-size:.95rem;
  color:#fff;
  margin-bottom:.5rem;
  letter-spacing:.05em;
}
.book-info p{
  font-size:.85rem;
  color:var(--text-muted);
  line-height:1.6;
}

/* ===== CONTACT ===== */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:3rem;
}
.contact-info h3{
  font-family:var(--font-heading);
  font-size:1rem;
  color:#fff;
  text-transform:uppercase;
  letter-spacing:.1em;
  margin-bottom:.5rem;
}
.contact-info p{color:var(--text-muted);margin-bottom:2rem}
.contact-links{list-style:none;display:flex;flex-direction:column;gap:1rem}
.contact-links li{display:flex;align-items:center;gap:.8rem;color:var(--text-muted)}
.contact-links .link-label{
  font-size:.7rem;text-transform:uppercase;letter-spacing:.15em;
  color:var(--accent-dim);min-width:70px;
}
.contact-form{display:flex;flex-direction:column;gap:1rem}
.contact-form label{
  font-size:.7rem;text-transform:uppercase;letter-spacing:.15em;
  color:var(--text-muted);margin-bottom:.2rem;
}
.contact-form input,
.contact-form textarea{
  width:100%;
  padding:.9rem 1rem;
  background:var(--bg-card);
  border:1px solid #ffffff10;
  color:var(--text);
  font-family:var(--font-body);
  font-size:.9rem;
  border-radius:2px;
  transition:border-color var(--transition);
  outline:none;
}
.contact-form input:focus,
.contact-form textarea:focus{border-color:var(--accent-dim)}
.contact-form textarea{resize:vertical;min-height:140px}
.form-group{display:flex;flex-direction:column}

/* ===== FOOTER ===== */
.footer{
  border-top:1px solid #ffffff08;
  padding:2.5rem 0;
  text-align:center;
}
.footer p{font-size:.8rem;color:var(--text-muted)}
.footer span{color:var(--accent)}

/* ===== PAGE HEADER (for inner pages) ===== */
.page-header{
  padding:160px 0 60px;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.page-header::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(ellipse at 50% 0%,#00e0ff08 0%,transparent 60%),
    linear-gradient(180deg,#0a0a0f,#0d0d18);
}
.page-header .container{position:relative}
.page-header h1{
  font-family:var(--font-heading);
  font-size:clamp(1.8rem,5vw,3rem);
  text-transform:uppercase;
  letter-spacing:.15em;
  color:#fff;
  margin-bottom:.5rem;
}
.page-header h1 span{color:var(--accent)}
.page-header p{color:var(--text-muted)}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .about-grid{grid-template-columns:1fr}
  .about-image{max-width:260px}
  .contact-grid{grid-template-columns:1fr}
}

@media(max-width:768px){
  .nav-links{
    position:fixed;top:72px;left:0;width:100%;
    background:var(--bg);
    flex-direction:column;align-items:center;
    padding:2rem 0;gap:1.5rem;
    transform:translateY(-120%);
    transition:transform var(--transition);
    border-bottom:1px solid #ffffff08;
  }
  .nav-links.open{transform:translateY(0)}
  .hamburger{display:flex}
  .hero h1{font-size:clamp(1.6rem,8vw,2.6rem)}
  .books-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
  .about-stats{gap:1.5rem}
}

@media(max-width:480px){
  .section{padding:70px 0}
  .hero-buttons{flex-direction:column}
  .hero-buttons .btn{text-align:center}
  .about-stats{flex-wrap:wrap;gap:1.2rem}
  .books-grid{grid-template-columns:1fr 1fr}
}

@media(max-width:360px){
  .books-grid{grid-template-columns:1fr}
}