/* CSS para Categorías de Libros - Edentia */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Sora:wght@300;400;500;600&family=Spectral:ital,wght@0,400;0,500;1,400;1,500&display=swap');

:root {
  --bg-color: #03130c;
  --bg-gradient: radial-gradient(120% 80% at 50% -10%, rgba(45,224,138,0.12), transparent 55%), 
                  radial-gradient(90% 60% at 80% 110%, rgba(34,211,196,0.10), transparent 60%);
  --ink-primary: #d7f5e6;
  --ink-secondary: #bfe6d4;
  --ink-muted: #7fa595;
  --ink-strong: #eafff4;
  --accent-neon: #2de08a;
  --accent-cyan: #22d3c4;
  --accent-yellow: #f3c969;
  
  --panel-bg: rgba(9, 28, 21, 0.55);
  --panel-border: rgba(143, 240, 192, 0.14);
  --panel-border-hover: rgba(45, 224, 138, 0.4);
  
  --card-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.6);
  --card-shadow-hover: 0 20px 40px -12px rgba(45, 224, 138, 0.25);
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

body[data-theme="light"] {
  --bg-color: #eef6ee;
  --bg-gradient: radial-gradient(120% 80% at 50% -10%, rgba(23, 138, 85, 0.08), transparent 60%),
                  radial-gradient(90% 60% at 80% 110%, rgba(20, 122, 83, 0.05), transparent 60%);
  --ink-primary: #15271d;
  --ink-secondary: #33503f;
  --ink-muted: #3d5448;
  --ink-strong: #0c1a12;
  --accent-neon: #178a55;
  --accent-cyan: #147a53;
  --accent-yellow: #b07d15;
  
  --panel-bg: rgba(255, 255, 255, 0.72);
  --panel-border: rgba(18, 66, 44, 0.16);
  --panel-border-hover: rgba(23, 138, 85, 0.45);
  
  --card-shadow: 0 10px 25px -8px rgba(0, 0, 0, 0.1);
  --card-shadow-hover: 0 18px 35px -8px rgba(23, 138, 85, 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--ink-primary);
  font-family: 'Sora', system-ui, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.5s ease, color 0.4s ease;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: var(--panel-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-neon);
}

/* Layout Elements */
header {
  position: relative;
  padding: 120px 24px 40px;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}

.brand-gradient {
  background: linear-gradient(100deg, var(--accent-neon), var(--accent-cyan) 38%, var(--accent-yellow) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(32px, 5vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-top: 15px;
  margin-bottom: 20px;
}

.subtitle {
  font-family: 'Spectral', serif;
  font-size: clamp(16px, 1.5vw, 20px);
  color: var(--ink-secondary);
  max-width: 600px;
  margin: 0 auto 30px;
  line-height: 1.5;
}

/* Badge Stats */
.stats-badge-container {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 99px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  color: var(--ink-secondary);
}

.stat-badge span {
  color: var(--accent-neon);
  font-weight: 700;
}

/* Controls section */
.search-filter-section {
  max-width: 1200px;
  margin: 0 auto 40px;
  padding: 0 24px;
}

.search-bar-wrapper {
  position: relative;
  max-width: 500px;
  margin: 0 auto 25px;
}

.search-input {
  width: 100%;
  padding: 16px 20px 16px 50px;
  border-radius: 99px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--ink-primary);
  font-family: 'Sora', sans-serif;
  font-size: 15px;
  backdrop-filter: blur(8px);
  transition: var(--transition-smooth);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-neon);
  box-shadow: 0 0 15px rgba(45, 224, 138, 0.2);
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-muted);
  pointer-events: none;
  font-size: 18px;
}

/* Tabs & Filters */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.tab-btn {
  padding: 10px 20px;
  border-radius: 99px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--ink-secondary);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: var(--transition-smooth);
}

.tab-btn:hover {
  border-color: var(--panel-border-hover);
  color: var(--ink-primary);
}

.tab-btn.active {
  background: linear-gradient(100deg, #2de08a, #22d3c4);
  color: #03130c;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 8px 20px -8px rgba(45, 224, 138, 0.5);
}

/* Language Filter */
.language-selector {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
  align-items: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  color: var(--ink-muted);
}

.lang-btn {
  padding: 6px 12px;
  border-radius: 99px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--ink-muted);
  cursor: pointer;
  transition: var(--transition-fast);
}

.lang-btn:hover, .lang-btn.active {
  border-color: var(--accent-neon);
  color: var(--accent-neon);
}

/* Book Grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
  min-height: 200px;
}

/* Book Card */
.book-card {
  border-radius: 20px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  backdrop-filter: blur(10px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  height: 100%;
}

.book-card:hover {
  transform: translateY(-8px);
  border-color: var(--panel-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.cover-wrapper {
  position: relative;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.book-card:hover .book-cover {
  transform: scale(1.05);
}

.card-badge {
  position: absolute;
  top: 15px;
  left: 15px;
  padding: 4px 10px;
  border-radius: 99px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(3, 19, 12, 0.75);
  border: 1px solid var(--panel-border);
  color: var(--accent-neon);
  backdrop-filter: blur(4px);
}

.card-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-strong);
  margin-bottom: 8px;
  line-height: 1.3;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 15px;
  border-top: 1px solid rgba(143, 240, 192, 0.08);
}

.lang-badge {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(45, 224, 138, 0.15);
  border: 1px solid rgba(45, 224, 138, 0.25);
  color: var(--accent-neon);
}

.btn-detail {
  margin-left: auto;
  background: transparent;
  border: none;
  color: var(--accent-neon);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
  border-radius: 6px;
  transition: var(--transition-fast);
}

.btn-detail:hover {
  background: rgba(45, 224, 138, 0.1);
  transform: translateX(3px);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 19, 12, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-container {
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.modal-overlay.active .modal-container {
  transform: scale(1);
}

.btn-close-modal {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  color: var(--ink-primary);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  z-index: 10;
}

.btn-close-modal:hover {
  border-color: var(--accent-neon);
  color: var(--accent-neon);
  transform: rotate(90deg);
}

.modal-content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding: 40px;
}

@media(min-width: 650px) {
  .modal-content-grid {
    grid-template-columns: 2fr 3fr;
  }
}

.modal-cover-wrapper {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 15px 35px rgba(0,0,0,0.5);
  aspect-ratio: 2 / 3;
}

.modal-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-info-panel {
  display: flex;
  flex-direction: column;
}

.modal-category {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-neon);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.modal-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(22px, 3.5vw, 32px);
  font-weight: 700;
  color: var(--ink-strong);
  margin-bottom: 15px;
  line-height: 1.15;
}

.modal-description {
  font-family: 'Spectral', serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-secondary);
  margin-bottom: 25px;
}

.modal-details {
  margin-top: auto;
  border-top: 1px solid var(--panel-border);
  padding-top: 20px;
}

.detail-row {
  display: flex;
  margin-bottom: 12px;
  font-size: 13.5px;
}

.detail-label {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  color: var(--ink-muted);
  width: 130px;
  flex-shrink: 0;
}

.detail-value {
  color: var(--ink-primary);
}

.detail-value a {
  color: var(--accent-neon);
  text-decoration: underline;
  transition: var(--transition-fast);
}

.detail-value a:hover {
  color: var(--accent-cyan);
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-muted);
}

.empty-icon {
  font-size: 40px;
  margin-bottom: 15px;
}

/* Nav styles */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px clamp(18px, 4vw, 52px);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(3, 19, 12, 0.4);
}

body[data-theme="light"] nav {
  background: rgba(238, 246, 238, 0.4);
}

.nav-logo img {
  height: 28px;
  filter: brightness(1.6) saturate(1.2);
}

body[data-theme="light"] .nav-logo img {
  filter: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.btn-theme {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 99px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--ink-primary);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: var(--transition-smooth);
}

.btn-theme:hover {
  border-color: var(--accent-neon);
  transform: translateY(-1px);
}

.nav-back {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13.5px;
  color: var(--ink-secondary);
  transition: var(--transition-fast);
}

.nav-back:hover {
  color: var(--accent-neon);
}

footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--panel-border);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  color: var(--ink-muted);
}

/* Light theme overrides for modal, badge and link contrast */
body[data-theme="light"] .modal-overlay {
  background: rgba(225, 238, 230, 0.8);
}
body[data-theme="light"] .card-badge {
  background: rgba(255, 255, 255, 0.88);
  color: #178a55;
  border-color: rgba(23, 138, 85, 0.2);
}
.alt-cover-link {
  color: var(--accent-neon);
  text-decoration: none;
  transition: var(--transition-fast);
}
.alt-cover-link:hover {
  color: var(--accent-cyan);
}