/* --------------------------------------------------
   Centrum knihy – Minimalist Flexbox CSS
   Brand: #2D3A40 (primary), #9E7958 (secondary), #EEF2F3 (accent)
   Fonts: Merriweather (display), Open Sans (body)
   Minimalist, clean, lots of white space, subtle shadows
   -------------------------------------------------- */

@import url('https://fonts.googleapis.com/css?family=Merriweather:700&display=swap');
@import url('https://fonts.googleapis.com/css?family=Open+Sans:400,600&display=swap');

:root {
  --color-primary: #2D3A40;
  --color-secondary: #9E7958;
  --color-accent: #EEF2F3;
  --color-bg: #fff;
  --color-text: #222;
  --color-muted: #6B7A86;
  --color-shadow: rgba(45,58,64,0.06);
  --color-shadow-strong: rgba(45,58,64,0.12);
  --radius: 10px;
  --transition: 0.2s cubic-bezier(.4,0,.2,1);
  --shadow: 0 2px 8px var(--color-shadow);
  --shadow-strong: 0 4px 16px var(--color-shadow-strong);
  --font-display: 'Merriweather', serif;
  --font-body: 'Open Sans', Arial, sans-serif;
  --header-height: 68px;
}

html {
  box-sizing: border-box;
  font-size: 16px;
  scroll-behavior: smooth;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  line-height: 1.7;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 0.7em;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h1 {
  font-size: 2.2rem;
  line-height: 1.15;
}
h2 {
  font-size: 1.5rem;
  line-height: 1.2;
}
h3 {
  font-size: 1.15rem;
  line-height: 1.25;
}
p, ul, ol {
  margin-top: 0;
  margin-bottom: 1.2em;
  color: var(--color-text);
}
strong {
  color: var(--color-primary);
  font-weight: 600;
}
a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Header & Navigation */
header {
  background: var(--color-bg);
  box-shadow: 0 1px 0 var(--color-shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
}
header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 24px;
}
header img {
  height: 38px;
  width: auto;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-primary);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.main-nav a:hover, .main-nav a:focus {
  color: var(--color-secondary);
  border-bottom: 2px solid var(--color-secondary);
}
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-primary);
  cursor: pointer;
  padding: 4px 8px;
  transition: color var(--transition);
}
.mobile-menu-toggle:focus {
  outline: 2px solid var(--color-secondary);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(45,58,64,0.96);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 0;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(.4,0,.2,1);
  pointer-events: none;
  opacity: 0;
}
.mobile-menu.open {
  transform: translateX(0);
  pointer-events: auto;
  opacity: 1;
}
.mobile-menu-close {
  background: none;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  margin: 24px 32px 0 0;
  cursor: pointer;
  transition: color var(--transition);
}
.mobile-menu-close:focus {
  outline: 2px solid var(--color-secondary);
}
.mobile-nav {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 24px;
  margin: 60px 40px 0 0;
}
.mobile-nav a {
  color: #fff;
  font-size: 1.25rem;
  font-family: var(--font-body);
  font-weight: 600;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.mobile-nav a:hover, .mobile-nav a:focus {
  color: var(--color-secondary);
  border-bottom: 2px solid var(--color-secondary);
}

/* Main Layout & Sections */
main {
  margin-top: 0;
  margin-bottom: 0;
}
section {
  margin-bottom: 60px;
  padding: 40px 20px;
  background: var(--color-bg);
}
.hero {
  background: var(--color-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 60px;
  padding: 60px 0 60px 0;
}
.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero .content-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.content-wrapper {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: flex-start;
}

/* Flexbox Patterns */
.features-grid,
.books-grid,
.books-carousel,
.blog-preview,
.blog-list,
.testimonials {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 20px;
}
.features-grid > div,
.books-grid > div,
.books-carousel > div,
.blog-preview > div,
.blog-list > div {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 22px;
  flex: 1 1 240px;
  min-width: 220px;
  max-width: 320px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.features-grid > div:hover,
.books-grid > div:hover,
.books-carousel > div:hover,
.blog-preview > div:hover,
.blog-list > div:hover {
  box-shadow: var(--shadow-strong);
  transform: translateY(-4px) scale(1.015);
}

.card-container {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
.card {
  margin-bottom: 20px;
  position: relative;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-strong);
  transform: translateY(-4px) scale(1.015);
}

.content-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
}
.text-image-section {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}
.testimonial-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  padding: 20px;
  background: var(--color-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-width: 220px;
  max-width: 340px;
  margin-bottom: 20px;
  color: var(--color-primary);
  font-size: 1.05rem;
  transition: box-shadow var(--transition), transform var(--transition);
}
.testimonial-card:hover {
  box-shadow: var(--shadow-strong);
  transform: translateY(-2px) scale(1.01);
}
.testimonial-card p {
  color: var(--color-primary);
  font-style: italic;
  margin-bottom: 0.5em;
}
.testimonial-card div {
  color: #F5B301;
  font-size: 1.2em;
  letter-spacing: 2px;
}
.testimonial-card span {
  color: var(--color-muted);
  font-size: 0.98em;
}

.feature-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 15px;
}

/* Newsletter Signup */
.newsletter-signup {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}
.newsletter-signup input[type="email"] {
  padding: 10px 14px;
  border: 1px solid #d6dbe0;
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-body);
  background: #fff;
  color: var(--color-primary);
  outline: none;
  transition: border-color var(--transition);
}
.newsletter-signup input[type="email"]:focus {
  border-color: var(--color-secondary);
}
.newsletter-signup button {
  padding: 10px 22px;
  background: var(--color-secondary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}
.newsletter-signup button:hover, .newsletter-signup button:focus {
  background: var(--color-primary);
  box-shadow: var(--shadow-strong);
}

.social-media-links {
  margin-top: 10px;
  font-size: 1rem;
  color: var(--color-muted);
}
.social-media-links a {
  color: var(--color-secondary);
  margin: 0 4px;
  transition: color var(--transition);
}
.social-media-links a:hover, .social-media-links a:focus {
  color: var(--color-primary);
}

/* Buttons */
.btn-primary, .category-filters button {
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1.08rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  text-align: center;
  margin-top: 10px;
}
.btn-primary:hover, .btn-primary:focus, .category-filters button:hover, .category-filters button:focus {
  background: var(--color-secondary);
  color: #fff;
  box-shadow: var(--shadow-strong);
  transform: translateY(-2px) scale(1.01);
}
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 18px;
}
.category-filters button {
  background: var(--color-accent);
  color: var(--color-primary);
  border: 1px solid var(--color-secondary);
  font-size: 1rem;
  padding: 8px 18px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 500;
  box-shadow: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.category-filters button.active, .category-filters button:active {
  background: var(--color-secondary);
  color: #fff;
  border-color: var(--color-secondary);
}

/* Forms */
input[type="search"] {
  width: 100%;
  max-width: 340px;
  padding: 10px 14px;
  border: 1px solid #d6dbe0;
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-body);
  background: #fff;
  color: var(--color-primary);
  outline: none;
  margin-top: 10px;
  margin-bottom: 10px;
  transition: border-color var(--transition);
}
input[type="search"]:focus {
  border-color: var(--color-secondary);
}

button {
  font-family: var(--font-body);
}

/* Footer */
footer {
  background: var(--color-accent);
  color: var(--color-primary);
  padding: 40px 0 0 0;
  border-top: 1px solid var(--color-shadow);
}
footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 30px;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.footer-brand img {
  height: 32px;
  margin-bottom: 6px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav a {
  color: var(--color-primary);
  font-size: 1rem;
  transition: color var(--transition);
}
.footer-nav a:hover, .footer-nav a:focus {
  color: var(--color-secondary);
}
.footer-contact {
  font-size: 0.98rem;
  color: var(--color-muted);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-newsletter {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 220px;
}

/* Blog List Preview */
.blog-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
.blog-list > div {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 22px;
  flex: 1 1 240px;
  min-width: 220px;
  max-width: 320px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.blog-list > div:hover {
  box-shadow: var(--shadow-strong);
  transform: translateY(-4px) scale(1.015);
}

/* Utility Classes */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.text-center { text-align: center !important; }

/* Cookie Consent Banner */
.cookie-banner {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 -2px 16px var(--color-shadow-strong);
  z-index: 99999;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 32px;
  font-size: 1rem;
  border-radius: 16px 16px 0 0;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s, transform 0.3s;
}
.cookie-banner.hide {
  opacity: 0;
  pointer-events: none;
  transform: translateY(100%);
}
.cookie-banner .cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.cookie-banner button {
  padding: 8px 18px;
  border-radius: var(--radius);
  border: none;
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}
.cookie-banner .accept {
  background: var(--color-secondary);
  color: #fff;
}
.cookie-banner .accept:hover, .cookie-banner .accept:focus {
  background: var(--color-primary);
}
.cookie-banner .reject {
  background: #fff;
  color: var(--color-primary);
  border: 1px solid var(--color-secondary);
}
.cookie-banner .reject:hover, .cookie-banner .reject:focus {
  background: var(--color-accent);
  color: var(--color-secondary);
}
.cookie-banner .settings {
  background: var(--color-accent);
  color: var(--color-primary);
  border: 1px solid var(--color-secondary);
}
.cookie-banner .settings:hover, .cookie-banner .settings:focus {
  background: var(--color-secondary);
  color: #fff;
}

/* Cookie Modal */
.cookie-modal-overlay {
  position: fixed;
  left: 0; right: 0; top: 0; bottom: 0;
  background: rgba(45,58,64,0.45);
  z-index: 100000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  pointer-events: auto;
  transition: opacity 0.3s;
}
.cookie-modal-overlay.hide {
  opacity: 0;
  pointer-events: none;
}
.cookie-modal {
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--shadow-strong);
  padding: 36px 32px 28px 32px;
  max-width: 420px;
  width: 92vw;
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: relative;
  animation: fadeInModal 0.3s cubic-bezier(.4,0,.2,1);
}
@keyframes fadeInModal {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
.cookie-modal h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5em;
}
.cookie-modal .cookie-category {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.cookie-modal .cookie-category label {
  font-size: 1rem;
  color: var(--color-primary);
}
.cookie-modal .cookie-category input[type="checkbox"] {
  accent-color: var(--color-secondary);
  width: 20px;
  height: 20px;
}
.cookie-modal .cookie-category.essential label {
  font-weight: 600;
  color: var(--color-primary);
}
.cookie-modal .cookie-category.essential input[type="checkbox"] {
  display: none;
}
.cookie-modal .modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 10px;
}
.cookie-modal button {
  padding: 8px 18px;
  border-radius: var(--radius);
  border: none;
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}
.cookie-modal .accept {
  background: var(--color-secondary);
  color: #fff;
}
.cookie-modal .accept:hover, .cookie-modal .accept:focus {
  background: var(--color-primary);
}
.cookie-modal .reject {
  background: #fff;
  color: var(--color-primary);
  border: 1px solid var(--color-secondary);
}
.cookie-modal .reject:hover, .cookie-modal .reject:focus {
  background: var(--color-accent);
  color: var(--color-secondary);
}
.cookie-modal .close {
  background: none;
  color: var(--color-muted);
  border: none;
  font-size: 1.5rem;
  position: absolute;
  top: 16px;
  right: 18px;
  cursor: pointer;
  transition: color var(--transition);
}
.cookie-modal .close:hover, .cookie-modal .close:focus {
  color: var(--color-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    max-width: 96vw;
  }
  footer .container {
    gap: 24px;
  }
}
@media (max-width: 900px) {
  .features-grid > div,
  .books-grid > div,
  .books-carousel > div,
  .blog-preview > div,
  .blog-list > div {
    min-width: 180px;
    max-width: 100%;
    flex: 1 1 180px;
  }
  .footer-newsletter {
    min-width: 160px;
  }
}
@media (max-width: 768px) {
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.18rem; }
  .container {
    padding: 0 10px;
  }
  .main-nav {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .footer-brand, .footer-contact, .footer-newsletter, .footer-nav {
    min-width: 0;
    width: 100%;
  }
  footer .container {
    flex-direction: column;
    gap: 18px;
    align-items: flex-start;
    padding-bottom: 18px;
  }
  .features-grid, .books-grid, .books-carousel, .blog-preview, .blog-list, .testimonials {
    flex-direction: column;
    gap: 20px;
  }
  .text-image-section {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }
  .newsletter-signup {
    flex-direction: column;
    gap: 8px;
  }
  .cookie-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 18px 10px;
    font-size: 0.98rem;
  }
  .cookie-modal {
    padding: 22px 10px 18px 10px;
    max-width: 98vw;
  }
}
@media (max-width: 480px) {
  .hero {
    padding: 32px 0 32px 0;
  }
  section {
    padding: 24px 6px;
  }
  .features-grid > div,
  .books-grid > div,
  .books-carousel > div,
  .blog-preview > div,
  .blog-list > div {
    padding: 18px 8px;
  }
  .testimonial-card {
    padding: 14px 8px;
  }
}

/* Hide visually but keep accessible */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Miscellaneous */
ul, ol {
  padding-left: 1.2em;
}
li {
  margin-bottom: 0.5em;
}

/* Prevent overlapping and ensure spacing */
section + section {
  margin-top: 0;
}

/* Remove outline on mouse, keep for keyboard */
:focus:not(:focus-visible) {
  outline: none;
}
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* End of CSS */