/* ==========================================================================
   CSA Books 4 Kids - Modern Children's Book Publishing Showcase
   Clean, Editorial, High-Converting, Responsive & Multi-Locale
   ========================================================================== */

/* --- VARIABILI DESIGN SYSTEM --- */
:root {
  /* Palette Colori Primari & Brand */
  --c-primary: #F05A28;
  --c-primary-hover: #D94818;
  --c-primary-soft: #FFF2EC;
  
  --c-accent-yellow: #FFB703;
  --c-accent-yellow-soft: #FFF9E6;
  
  --c-accent-blue: #0288D1;
  --c-accent-blue-soft: #E1F5FE;
  
  --c-accent-green: #2E7D32;
  --c-accent-green-soft: #E8F5E9;
  
  --c-accent-coral: #E91E63;
  --c-accent-coral-soft: #FCE4EC;

  /* Neutri & Sfondi */
  --c-bg-page: #FAF7F2;
  --c-bg-surface: #FFFFFF;
  --c-bg-subtle: #F3ECE1;
  
  --c-text-primary: #151D2A;
  --c-text-secondary: #4A5568;
  --c-text-muted: #718096;
  
  --c-border: #E8DECF;
  --c-border-light: #F0E9DF;

  /* Tipografia */
  --font-heading: 'Fredoka', 'Quicksand', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Raggi e Ombre */
  --radius-xs: 6px;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --shadow-card: 0 4px 20px rgba(21, 29, 42, 0.06), 0 1px 3px rgba(21, 29, 42, 0.04);
  --shadow-hover: 0 16px 36px rgba(240, 90, 40, 0.18), 0 4px 12px rgba(21, 29, 42, 0.06);
  --shadow-book: 0 12px 28px rgba(21, 29, 42, 0.14), 0 2px 6px rgba(21, 29, 42, 0.08);

  --container-max: 1280px;
  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  background-color: var(--c-bg-page);
  color: var(--c-text-primary);
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--c-accent-blue);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- HEADER / TOP BAR --- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 1rem;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.header-series-logo {
  height: 52px;
  max-width: 190px;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(21, 29, 42, 0.08));
  transition: var(--transition);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--c-text-primary);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.brand-name span.highlight {
  color: var(--c-primary);
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Header Controls: Social & Language Switcher */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* Language Selector Pills */
.lang-switcher-box {
  display: flex;
  align-items: center;
  background-color: var(--c-bg-subtle);
  padding: 4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
}

.lang-btn {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--c-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
}

.lang-btn:hover {
  color: var(--c-text-primary);
}

.lang-btn.active {
  background-color: #FFFFFF;
  color: var(--c-primary);
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Social Icon Pills */
.social-header-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.social-pill-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 6px 12px;
  background-color: #FFFFFF;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-text-secondary);
  transition: var(--transition);
}

.social-pill-link svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

.social-pill-link:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background-color: var(--c-primary-soft);
  transform: translateY(-1px);
}

/* --- GRIGLIA CATALOGO LIBRI --- */
.catalog-section {
  padding: 2.5rem 0 4rem 0;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

/* Card Libro */
.book-card {
  background-color: var(--c-bg-surface);
  border: 1px solid var(--c-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  position: relative;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(240, 90, 40, 0.3);
}

/* Cover Wrapper (Quadrata 1:1) */
.book-cover-wrap {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  background: var(--c-bg-subtle);
  box-shadow: var(--shadow-book);
  margin-bottom: 1.15rem;
}

.book-cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}

.book-card:hover .book-cover-wrap img {
  transform: scale(1.04);
}

/* Volume Badge */
.book-vol-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--c-accent-yellow);
  color: #151D2A;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  z-index: 2;
}

/* Meta Chips */
.book-card-meta {
  display: flex;
  align-items: center;
  margin-bottom: 0.65rem;
  min-height: 30px;
}

/* Card Content */
.book-card-title {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.28;
  color: var(--c-text-primary);
  margin-bottom: 0.35rem;
}

.book-card-author {
  font-size: 0.88rem;
  color: #000000;
  font-weight: 700;
  margin-bottom: 1.15rem;
}

.book-card-author span.muted {
  color: #4B5563;
  font-weight: 400;
}

/* Amazon Action Button */
.book-cta-wrapper {
  margin-top: auto;
  position: relative;
}

.btn-amazon-direct {
  width: 100%;
  background: linear-gradient(180deg, #FFA41C 0%, #F08804 100%);
  color: #111111;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.82rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(240, 136, 4, 0.28);
  transition: var(--transition);
}

.btn-amazon-direct:hover {
  background: linear-gradient(180deg, #FFB338 0%, #E27B00 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(240, 136, 4, 0.38);
}

/* Multi-Marketplace Dropdown */
.amazon-dropdown-group {
  position: relative;
  width: 100%;
}

.amazon-dropdown-trigger-btn {
  width: 100%;
  background: linear-gradient(180deg, #FFA41C 0%, #F08804 100%);
  color: #111111;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.82rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(240, 136, 4, 0.28);
  transition: var(--transition);
}

.amazon-dropdown-trigger-btn:hover {
  background: linear-gradient(180deg, #FFB338 0%, #E27B00 100%);
  transform: translateY(-2px);
}

.amazon-dropdown-list {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  width: 100%;
  background: #FFFFFF;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.14);
  padding: 0.45rem;
  display: none;
  flex-direction: column;
  gap: 0.3rem;
  z-index: 50;
}

.amazon-dropdown-list.show {
  display: flex;
}

.amazon-store-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-xs);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--c-text-primary);
  background: var(--c-bg-subtle);
  transition: var(--transition);
}

.amazon-store-item:hover {
  background-color: var(--c-accent-yellow-soft);
  color: #9A6700;
}

/* Badge / Pulsante Leggi Estratto */
.chip-sample-btn {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
  font-family: var(--font-heading);
  font-size: 0.84rem;
  font-weight: 700;
  padding: 0.32rem 0.85rem;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: var(--transition);
}

.chip-sample-btn:hover {
  background: var(--c-primary);
  color: #FFFFFF;
  transform: translateY(-1px) scale(1.03);
  box-shadow: 0 4px 12px rgba(240, 90, 40, 0.28);
}

/* ==========================================================================
   MODAL POPUP ANTEPRIMA (READ SAMPLE VIEWER)
   ========================================================================== */
.sample-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  padding: 1rem;
}

.sample-modal-backdrop.open {
  display: flex !important;
}

.sample-modal-dialog {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 94vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  transform: scale(0.92);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.sample-modal-backdrop.open .sample-modal-dialog {
  transform: scale(1);
}

.sample-modal-header {
  padding: 1.15rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-bg-page);
}

.sample-modal-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  overflow: hidden;
}

.sample-modal-badge {
  background: var(--c-accent-yellow);
  color: #151D2A;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.sample-modal-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sample-modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--c-border);
  color: var(--c-text-primary);
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}

.sample-modal-close:hover {
  background: var(--c-primary);
  color: #FFFFFF;
  transform: rotate(90deg);
}

.sample-modal-body {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  background: #FDFDFD;
  gap: 0.75rem;
  flex: 1;
  overflow: hidden;
}

.sample-nav-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--c-bg-surface);
  border: 2px solid var(--c-border);
  color: var(--c-text-primary);
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: var(--transition);
  flex-shrink: 0;
  z-index: 10;
}

.sample-nav-btn:hover:not(:disabled) {
  background: var(--c-primary);
  color: #FFFFFF;
  border-color: var(--c-primary);
  transform: scale(1.08);
}

.sample-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.sample-page-viewer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 440px;
  width: 100%;
  margin: 0 auto;
}

.sample-img-container {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--c-bg-subtle);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sample-page-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.sample-page-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-top: 0.75rem;
  padding: 0 0.5rem;
}

.sample-page-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--c-text-primary);
}

.sample-page-counter {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--c-text-muted);
}

.sample-modal-footer {
  padding: 1rem 1.5rem;
  background: var(--c-bg-page);
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sample-modal-footer .btn-amazon-direct,
.sample-modal-footer .amazon-dropdown-group {
  max-width: 380px;
}

/* --- FOOTER --- */
.site-footer {
  background-color: #111827;
  color: #9CA3AF;
  padding: 2.5rem 0 2rem 0;
  border-top: 1px solid #1F2937;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin-bottom: 1.5rem;
}

.footer-brand-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}

.footer-bottom-copy {
  border-top: 1px solid #1F2937;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: #6B7280;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */

@media (max-width: 1100px) {
  .catalog-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    padding: 0.75rem 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .brand-identity {
    justify-content: center;
  }

  .header-actions {
    justify-content: space-between;
    width: 100%;
  }

  .catalog-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .header-series-logo {
    height: 36px;
    max-width: 120px;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin: 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}