/* ============================================================
   BOOKVERSE - Estilos Principales
   Autor: BookVerse Team
   Versión: 1.0.0
   ============================================================ */

/* ==================== VARIABLES CSS ==================== */
:root {
  --color-bg: #0d0d1a;
  --color-bg-secondary: #12122a;
  --color-surface: #1a1a35;
  --color-surface2: #222245;
  --color-border: rgba(255,255,255,0.08);

  --color-primary: #c0392b;
  --color-primary-light: #e74c3c;
  --color-primary-dark: #922b21;
  --color-accent: #f0a500;
  --color-accent-light: #f5c242;

  --color-text: #e8e8f0;
  --color-text-muted: #9090b0;
  --color-text-light: #ffffff;

  --color-success: #27ae60;
  --color-error: #e74c3c;
  --color-warning: #f39c12;
  --color-info: #3498db;

  --font-main: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-heading: Georgia, 'Times New Roman', serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 999px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 24px rgba(192,57,43,0.3);

  --transition: 0.3s ease;
  --transition-fast: 0.15s ease;

  --nav-height: 70px;
  --container-max: 1280px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-light); }

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

ul { list-style: none; }

button {
  cursor: pointer;
  border: none;
  font-family: var(--font-main);
}

input, select, textarea {
  font-family: var(--font-main);
}

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

/* ==================== BOTONES ==================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-light);
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover::after { opacity: 1; }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: var(--color-text-light);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.btn-outline:hover {
  background: var(--color-surface);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.btn-full { width: 100%; }

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}
.btn-icon:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* ==================== SECCIONES ==================== */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  height: 3px;
  width: 60px;
  background: var(--color-primary);
  margin: 0.5rem auto 0;
  border-radius: var(--radius-full);
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-top: 0.75rem;
}

/* ==================== NAVBAR ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(13, 13, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(13, 13, 26, 0.98);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-text-light);
  white-space: nowrap;
  text-decoration: none;
}
.logo-icon { font-size: 1.6rem; }
.logo-accent { color: var(--color-primary-light); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: 0.5rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--color-text-light);
  background: rgba(255,255,255,0.06);
}
.nav-link.active {
  color: var(--color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.cart-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.5rem 1rem;
  color: var(--color-text);
  font-size: 1.1rem;
  transition: all var(--transition);
  gap: 0.4rem;
}
.cart-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: scale(1.05);
}
.cart-icon { font-size: 1.2rem; }
.cart-badge {
  background: var(--color-primary-light);
  color: white;
  border-radius: var(--radius-full);
  min-width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0 0.3rem;
  transition: transform var(--transition-fast);
}
.cart-badge.bump { transform: scale(1.4); }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem;
}
.hamburger {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}
.menu-toggle.open .hamburger:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open .hamburger:nth-child(2) { opacity: 0; }
.menu-toggle.open .hamburger:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==================== HERO ==================== */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(192,57,43,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(240,165,0,0.08) 0%, transparent 50%),
              linear-gradient(135deg, #0d0d1a 0%, #12122a 100%);
  z-index: -1;
}

.hero-content {
  padding: 4rem 2rem 4rem calc((100vw - var(--container-max)) / 2 + 1.5rem);
  max-width: calc(var(--container-max) / 2 + (100vw - var(--container-max)) / 2);
  animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  color: var(--color-text-light);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-accent {
  color: var(--color-primary-light);
  position: relative;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
}
.stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-light);
}
.stat span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  position: relative;
}

.book-stack {
  display: flex;
  gap: 1rem;
  align-items: flex-end;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeIn 1s ease 0.3s both;
}

.book-cover-preview {
  border-radius: 4px 12px 12px 4px;
  box-shadow: -4px 4px 12px rgba(0,0,0,0.5);
  transition: transform var(--transition);
  cursor: pointer;
}
.book-cover-preview:hover { transform: translateY(-8px) rotate(-2deg); }

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.scroll-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  animation: scrollBounce 1.5s ease-in-out infinite;
}

/* ==================== CATEGORÍAS ==================== */
.categories-section {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.category-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  background: var(--color-surface2);
}
.category-card.active {
  border-color: var(--color-primary);
  background: rgba(192,57,43,0.15);
}
.category-icon { font-size: 2rem; }
.category-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}
.category-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ==================== BÚSQUEDA Y FILTROS ==================== */
.search-wrapper {
  margin-bottom: 1.5rem;
}

.search-bar {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0 1.25rem;
  transition: border-color var(--transition);
  max-width: 640px;
  margin: 0 auto;
}
.search-bar:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(192,57,43,0.15);
}
.search-icon { font-size: 1rem; color: var(--color-text-muted); }
.search-bar input {
  flex: 1;
  padding: 0.85rem 0.75rem;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 0.95rem;
}
.search-bar input::placeholder { color: var(--color-text-muted); }
.search-clear {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1rem;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  display: none;
}
.search-clear.visible { display: flex; align-items: center; justify-content: center; }
.search-clear:hover { background: var(--color-surface2); color: var(--color-text); }

.filters-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 150px;
  flex: 1;
}
.filter-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.filter-group select {
  padding: 0.6rem 0.85rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}
.filter-group select:focus { border-color: var(--color-primary); }

.btn-clear-filters {
  padding: 0.6rem 1.2rem;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
  align-self: flex-end;
}
.btn-clear-filters:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.results-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.active-filters { color: var(--color-accent); font-weight: 500; }

/* ==================== GRID DE LIBROS ==================== */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}

.book-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  animation: fadeInUp 0.4s ease forwards;
}
.book-card:hover {
  transform: translateY(-6px);
  border-color: rgba(192,57,43,0.4);
  box-shadow: var(--shadow-lg);
}

.book-badges {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  z-index: 2;
}
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge-oferta { background: var(--color-primary); color: white; }
.badge-premium { background: var(--color-accent); color: #1a1a1a; }
.badge-nuevo { background: var(--color-success); color: white; }
.badge-agotado { background: var(--color-text-muted); color: var(--color-bg); }

.book-cover-wrapper {
  position: relative;
  aspect-ratio: 2/3;
  overflow: hidden;
  background: var(--color-surface2);
}
.book-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.book-card:hover .book-cover-img { transform: scale(1.05); }

.book-cover-svg {
  width: 100%;
  height: 100%;
}

.book-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.book-card:hover .book-overlay { opacity: 1; }
.book-overlay-btn {
  padding: 0.6rem 1.2rem;
  background: white;
  color: #1a1a1a;
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transform: translateY(10px);
  transition: transform var(--transition);
}
.book-card:hover .book-overlay-btn { transform: translateY(0); }

.book-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.35rem;
}
.book-genre {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}
.book-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-light);
  line-height: 1.3;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.book-author {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.book-rating {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
}
.stars { color: var(--color-accent); letter-spacing: -1px; }
.rating-count { color: var(--color-text-muted); }
.book-stock {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.stock-low { color: var(--color-warning); font-weight: 600; }
.stock-out { color: var(--color-error); font-weight: 600; }

.book-footer {
  padding: 0.75rem 1rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}
.book-price-block { display: flex; flex-direction: column; }
.book-price {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-light);
}
.book-price-original {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-decoration: line-through;
}
.book-price-discount {
  font-size: 0.75rem;
  color: var(--color-success);
  font-weight: 600;
}

.add-to-cart-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
.add-to-cart-btn:hover {
  background: var(--color-primary-light);
  transform: scale(1.1);
}
.add-to-cart-btn:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
  transform: none;
}

/* ==================== ESTADO VACÍO ==================== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  grid-column: 1 / -1;
}
.empty-icon { font-size: 4rem; margin-bottom: 1rem; opacity: 0.6; }
.empty-state h3 { font-size: 1.3rem; color: var(--color-text); margin-bottom: 0.5rem; }
.empty-state p { color: var(--color-text-muted); margin-bottom: 1.5rem; }

/* ==================== SECCIÓN OFERTAS ==================== */
.offers-section {
  background: linear-gradient(135deg, #160a0a 0%, #1a0d0d 100%);
  border-top: 1px solid rgba(192,57,43,0.2);
  border-bottom: 1px solid rgba(192,57,43,0.2);
}

.offers-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
  text-align: left;
  margin-bottom: 2.5rem;
}
.offers-header .section-title::after { margin: 0.5rem 0 0; }

.countdown {
  text-align: center;
  background: var(--color-surface);
  border: 1px solid rgba(192,57,43,0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
}
.countdown-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.countdown-timer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.time-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 2.5rem;
}
.time-unit span {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-light);
  font-variant-numeric: tabular-nums;
}
.time-unit small {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
}
.time-sep {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.offers-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

/* ==================== NOSOTROS ==================== */
.about-section { background: var(--color-bg-secondary); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: center;
}
.about-visual {
  display: flex;
  justify-content: center;
}
.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 280px;
  box-shadow: var(--shadow-lg);
}
.about-icon-big { font-size: 4rem; margin-bottom: 1rem; }
.about-card h3 { font-size: 1.5rem; color: var(--color-text-light); margin-bottom: 0.5rem; }
.about-card p { color: var(--color-text-muted); }

.about-content .section-title { text-align: left; }
.about-content .section-title::after { margin-left: 0; }
.about-text { color: var(--color-text-muted); margin-bottom: 1rem; font-size: 1rem; line-height: 1.7; }

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}
.feature {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}
.feature:hover { border-color: rgba(192,57,43,0.4); }
.feature-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 0.1rem; }
.feature h4 { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 0.2rem; }
.feature p { font-size: 0.8rem; color: var(--color-text-muted); }

/* ==================== CONTACTO ==================== */
.contact-section { background: var(--color-bg); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 1.25rem; }
.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}
.contact-item:hover { border-color: rgba(192,57,43,0.4); }
.ci-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 0.1rem; }
.contact-item h4 { font-size: 0.9rem; font-weight: 600; color: var(--color-text-light); margin-bottom: 0.2rem; }
.contact-item p { font-size: 0.85rem; color: var(--color-text-muted); }

.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--color-text-muted); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(192,57,43,0.1);
}
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: var(--color-error);
}
.form-group input.success,
.form-group select.success,
.form-group textarea.success {
  border-color: var(--color-success);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-group select option { background: var(--color-bg); }

.field-error {
  font-size: 0.8rem;
  color: var(--color-error);
  display: none;
}
.field-error.visible { display: block; }

.char-count { font-size: 0.75rem; color: var(--color-text-muted); text-align: right; }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
}
.checkbox-label input[type="checkbox"] { width: 1rem; height: 1rem; cursor: pointer; accent-color: var(--color-primary); }
.link { color: var(--color-accent); text-decoration: underline; }

/* ==================== CARRITO MODAL ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  backdrop-filter: blur(4px);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.cart-modal {
  width: 100%;
  max-width: 440px;
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition);
}
.modal-overlay.open .cart-modal { transform: translateX(0); }

.cart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}
.cart-header h2 { font-size: 1.2rem; color: var(--color-text-light); }
.cart-close {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.cart-close:hover { background: var(--color-primary); color: white; border-color: var(--color-primary); }

.cart-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

.cart-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
  height: 100%;
}
.cart-empty-icon { font-size: 4rem; margin-bottom: 1rem; opacity: 0.5; }
.cart-empty h3 { color: var(--color-text-light); margin-bottom: 0.5rem; }
.cart-empty p { color: var(--color-text-muted); font-size: 0.9rem; }

.cart-item {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  animation: slideIn 0.2s ease;
}
.cart-item-cover {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 2/3;
}
.cart-item-body { display: flex; flex-direction: column; gap: 0.25rem; }
.cart-item-title { font-size: 0.9rem; font-weight: 600; color: var(--color-text-light); line-height: 1.3; }
.cart-item-author { font-size: 0.78rem; color: var(--color-text-muted); }
.cart-item-price { font-size: 0.95rem; font-weight: 700; color: var(--color-text-light); }

.cart-item-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
}
.qty-btn {
  width: 1.8rem;
  height: 1.8rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.qty-btn:hover { background: var(--color-primary); border-color: var(--color-primary); color: white; }
.qty-number { font-size: 0.9rem; font-weight: 600; color: var(--color-text-light); min-width: 1.5rem; text-align: center; }
.cart-item-remove {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.cart-item-remove:hover { color: var(--color-error); background: rgba(231,76,60,0.1); }

.cart-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
}
.cart-totals { margin-bottom: 1rem; }
.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}
.total-row:last-child { border-bottom: none; }
.total-final {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-light) !important;
  padding-top: 0.6rem;
}
.cart-actions { display: flex; flex-direction: column; gap: 0.75rem; }

/* ==================== TOASTS ==================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 280px;
  max-width: 380px;
  pointer-events: all;
  animation: toastIn 0.3s ease forwards;
  border-left: 3px solid;
}
.toast.success { border-left-color: var(--color-success); }
.toast.error { border-left-color: var(--color-error); }
.toast.warning { border-left-color: var(--color-warning); }
.toast.info { border-left-color: var(--color-info); }
.toast-icon { font-size: 1.2rem; flex-shrink: 0; }
.toast-msg { font-size: 0.875rem; color: var(--color-text); flex: 1; }
.toast-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  line-height: 1;
  pointer-events: all;
}
.toast-close:hover { color: var(--color-text); }
.toast.fade-out { animation: toastOut 0.3s ease forwards; }

/* ==================== FOOTER ==================== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-brand .logo { margin-bottom: 0.75rem; }
.footer-brand p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.6; }
.footer-links h4 { font-size: 0.9rem; font-weight: 700; color: var(--color-text-light); margin-bottom: 1rem; }
.footer-links ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { font-size: 0.85rem; color: var(--color-text-muted); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-text); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ==================== SCROLL TOP ==================== */
.scroll-top-btn {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  z-index: 999;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
}
.scroll-top-btn.visible {
  opacity: 1;
  transform: translateY(0);
}
.scroll-top-btn:hover { background: var(--color-primary-light); transform: translateY(-3px); }

/* ==================== ANIMACIONES ==================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100%); }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.4; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-fade-in { animation: fadeIn 0.5s ease forwards; }
.animate-fade-in-up { animation: fadeInUp 0.5s ease forwards; }

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-surface2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; }
  .hero-content {
    padding: calc(var(--nav-height) + 3rem) 2rem 2rem;
    max-width: 100%;
    text-align: center;
  }
  .hero-subtitle, .hero-desc { max-width: 100%; }
  .hero-actions, .hero-stats { justify-content: center; }
  .hero-visual { display: none; }

  .about-grid { grid-template-columns: 1fr; }
  .about-visual { display: none; }
  .about-content .section-title { text-align: center; }
  .about-content .section-title::after { margin: 0.5rem auto 0; }

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

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(13,13,26,0.98);
    flex-direction: column;
    padding: 1.5rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    z-index: 999;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .nav-link { padding: 0.75rem 1rem; font-size: 1rem; width: 100%; }
  .menu-toggle { display: flex; }

  .contact-grid { grid-template-columns: 1fr; }
  .about-features { grid-template-columns: 1fr; }
  .filters-bar { flex-direction: column; }
  .filter-group { min-width: unset; }
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .offers-header { flex-direction: column; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-stats { gap: 1.5rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .book-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .cart-modal { max-width: 100%; }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .section { padding: 3rem 0; }
}