/* ==========================================================================
   ALIS - Acceso Literario e Innovación Sistémica
   Design System & Theme Styles
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@500;700&family=Inter:wght@300;400;500;600;700&family=Literata:ital,opsz,wght@0,7..72,400;0,7..72,600;1,7..72,400&family=Open+Sans:ital,wght@0,400;0,600;1,400&display=swap');

:root {
  /* Color Palette - Modern Glassmorphic Dark Mode */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(31, 41, 55, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  
  --accent-cyan: #38bdf8;
  --accent-blue: #60a5fa;
  --accent-purple: #c084fc;
  --accent-gold: #fbbf24;
  --accent-emerald: #34d399;
  --accent-rose: #f43f5e;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  /* Reader Theme Vars (Default Light) */
  --reader-bg: #ffffff;
  --reader-text: #1e293b;
  --reader-accent: #2563eb;
  --reader-border: #e2e8f0;
  
  /* Highlights Colors */
  --hl-yellow: rgba(253, 224, 71, 0.4);
  --hl-green: rgba(134, 239, 172, 0.4);
  --hl-blue: rgba(147, 197, 253, 0.4);
  --hl-pink: rgba(249, 168, 212, 0.4);
  --hl-purple: rgba(216, 180, 254, 0.4);

  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-serif: 'Literata', Georgia, serif;
  --font-display: 'Cinzel', serif;
  --font-dyslexic: 'Comic Sans MS', sans-serif;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header & Navigation Bar */
.alis-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  cursor: pointer;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  letter-spacing: 1px;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.5px;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  display: block;
  font-family: var(--font-sans);
  font-weight: 400;
}

/* Privacy & Zero-Telemetry Badge */
.privacy-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(52, 211, 153, 0.1);
  color: var(--accent-emerald);
  border: 1px solid rgba(52, 211, 153, 0.3);
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-nav {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-nav:hover, .btn-nav.active {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #0b0f19;
  border: none;
  font-weight: 700;
}

.btn-accent:hover {
  opacity: 0.9;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

/* Main Search & Hero Section */
.hero-section {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #ffffff 30%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.search-bar-container {
  display: flex;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 0.4rem;
  box-shadow: var(--shadow-lg);
  transition: border-color 0.2s ease;
}

.search-bar-container:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-size: 1rem;
  outline: none;
}

.search-input::placeholder {
  color: var(--text-dim);
}

.search-btn {
  background: var(--accent-cyan);
  color: #0f172a;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity 0.2s ease;
}

.search-btn:hover {
  opacity: 0.9;
}

/* Filter Controls Bar */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.filter-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-pill:hover, .filter-pill.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Content Views Container */
.main-content {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
}

/* Books Grid */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.book-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.4);
}

.cover-wrapper {
  position: relative;
  width: 100%;
  padding-top: 145%;
  background: var(--bg-secondary);
  overflow: hidden;
}

.cover-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.cover-fallback {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
  background: linear-gradient(135deg, #1e293b, #0f172a);
}

.cover-fallback-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.source-badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--accent-cyan);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.book-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.book-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.3rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.book-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.btn-card {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  text-align: center;
  transition: all 0.2s ease;
}

.btn-card:hover {
  background: var(--accent-cyan);
  color: #0b0f19;
}

/* Personal Library & Drag & Drop Upload Zone */
.drop-zone {
  border: 2px dashed rgba(56, 189, 248, 0.3);
  background: rgba(56, 189, 248, 0.03);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  margin-bottom: 2rem;
  transition: all 0.2s ease;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
}

.drop-icon {
  font-size: 2.5rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

/* ALIS Reader View (Universal Multiformato) */
.reader-container {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  background-color: var(--reader-bg);
  color: var(--reader-text);
  flex-direction: column;
}

.reader-container.active {
  display: flex;
}

.reader-header {
  background: rgba(0, 0, 0, 0.04);
  border-bottom: 1px solid var(--reader-border);
  padding: 0.6rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.reader-title-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-reader-back {
  background: transparent;
  border: 1px solid var(--reader-border);
  color: inherit;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
}

.reader-book-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1rem;
}

.reader-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-reader-tool {
  background: transparent;
  border: 1px solid var(--reader-border);
  color: inherit;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-reader-tool:hover {
  background: rgba(0, 0, 0, 0.05);
}

.reader-body {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.reader-viewport {
  flex: 1;
  padding: 2rem 4rem;
  overflow-y: auto;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.7;
  max-width: 850px;
  margin: 0 auto;
}

.reader-sidebar {
  width: 320px;
  border-left: 1px solid var(--reader-border);
  background: rgba(0, 0, 0, 0.02);
  padding: 1rem;
  overflow-y: auto;
  display: none;
}

.reader-sidebar.active {
  display: block;
}

/* Reader Themes */
.theme-light {
  --reader-bg: #ffffff;
  --reader-text: #1e293b;
  --reader-border: #e2e8f0;
}

.theme-sepia {
  --reader-bg: #fbf0d9;
  --reader-text: #5f4b32;
  --reader-border: #e8d7b8;
}

.theme-night {
  --reader-bg: #1e293b;
  --reader-text: #f1f5f9;
  --reader-border: #334155;
}

.theme-oled {
  --reader-bg: #000000;
  --reader-text: #e2e8f0;
  --reader-border: #1e293b;
}

/* Modals */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.social-auth-btn {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  transition: all 0.2s ease;
}

.social-auth-btn:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: auto;
}