/**
 * Design System - Biblioteca Online
 * Modern SaaS-style design inspired by Linear, Notion, Airbnb
 * Version: 2.0
 */

/* ============================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */
:root {
  /* === Color Palette === */
  
  /* Base Colors */
  --color-bg-primary: #FAFAFA;
  --color-bg-secondary: #F4F4F5;
  --color-bg-tertiary: #FFFFFF;
  --color-bg-elevated: #FFFFFF;
  --color-bg-hover: #F4F4F5;
  --color-bg-active: #E4E4E7;
  
  /* Text Colors */
  --color-text-primary: #18181B;
  --color-text-secondary: #52525B;
  --color-text-muted: #A1A1AA;
  --color-text-inverse: #FFFFFF;
  
  /* Accent - Indigo Electric */
  --color-accent: #6366F1;
  --color-accent-hover: #4F46E5;
  --color-accent-active: #4338CA;
  --color-accent-light: #EEF2FF;
  --color-accent-subtle: #E0E7FF;
  
  /* Semantic Colors */
  --color-success: #10B981;
  --color-success-light: #D1FAE5;
  --color-success-dark: #059669;
  
  --color-warning: #F59E0B;
  --color-warning-light: #FEF3C7;
  --color-warning-dark: #D97706;
  
  --color-danger: #EF4444;
  --color-danger-light: #FEE2E2;
  --color-danger-dark: #DC2626;
  
  --color-info: #3B82F6;
  --color-info-light: #DBEAFE;
  --color-info-dark: #2563EB;
  
  /* Borders */
  --color-border: #E4E4E7;
  --color-border-light: #F4F4F5;
  --color-border-focus: #6366F1;
  
  /* === Typography === */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 2rem;      /* 32px */
  --text-4xl: 2.5rem;    /* 40px */
  --text-5xl: 3rem;      /* 48px */
  
  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
  
  /* Letter Spacing */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  
  /* === Spacing === */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* === Border Radius === */
  --radius-none: 0;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* === Shadows === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.04);
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-blur: blur(12px);
  --glass-border: rgba(255, 255, 255, 0.2);
  
  /* === Transitions === */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;
  
  /* === Z-Index Scale === */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;
  
  /* === Layout === */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 72px;
  --header-height: 64px;
  --content-max-width: 1400px;
}

/* Dark Mode Support */
[data-theme="dark"] {
  --color-bg-primary: #09090B;
  --color-bg-secondary: #18181B;
  --color-bg-tertiary: #1F1F23;
  --color-bg-elevated: #27272A;
  --color-bg-hover: #27272A;
  --color-bg-active: #3F3F46;
  
  --color-text-primary: #FAFAFA;
  --color-text-secondary: #A1A1AA;
  --color-text-muted: #71717A;
  --color-text-inverse: #09090B;
  
  --color-border: #3F3F46;
  --color-border-light: #27272A;
  
  --color-accent-light: rgba(99, 102, 241, 0.15);
  --color-accent-subtle: rgba(99, 102, 241, 0.2);
  
  --glass-bg: rgba(9, 9, 11, 0.85);
  --glass-border: rgba(63, 63, 70, 0.5);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

/* ============================================
   ICON STYLES
   ============================================ */
.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

.icon-xs {
  width: 14px;
  height: 14px;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-lg {
  width: 24px;
  height: 24px;
}

.icon-xl {
  width: 32px;
  height: 32px;
}

/* ============================================
   BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.modern-ui {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  margin: 0;
  padding: 0;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
.heading-1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

.heading-2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

.heading-3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

.heading-4 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

.text-body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

.text-small {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.text-caption {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-weight: var(--font-medium);
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

/* App Shell */
.app-shell {
  display: flex;
  min-height: 100vh;
  background: var(--color-bg-primary);
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-fixed);
  transition: width var(--transition-base), transform var(--transition-base);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .nav-section-title,
.sidebar.collapsed .nav-item span {
  opacity: 0;
  width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.sidebar.collapsed .sidebar-header {
  justify-content: center;
  padding: var(--space-4) var(--space-2);
  min-height: 80px;
}

.sidebar.collapsed .sidebar-logo {
  max-width: 52px;
  max-height: 52px;
  width: 52px;
  height: 52px;
  object-fit: cover;
  padding: var(--space-1);
}

.sidebar.collapsed .sidebar-toggle {
  position: absolute;
  right: -12px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  width: 24px;
  height: 24px;
  padding: 0;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: var(--space-2);
}

.sidebar.collapsed .nav-item-icon {
  width: 22px;
  height: 22px;
}

.sidebar.collapsed .sidebar-footer {
  padding: var(--space-2);
}

.sidebar.collapsed .sidebar-footer .nav-item {
  justify-content: center;
}

.sidebar-header {
  padding: var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  min-height: auto;
  padding-bottom: var(--space-5);
  position: relative;
}

.sidebar-toggle {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.sidebar-toggle:hover {
  opacity: 1;
}

.sidebar-logo {
  max-width: 140px;
  max-height: 60px;
  width: auto;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: contain;
  background: var(--color-bg-secondary);
  padding: var(--space-2);
  transition: all var(--transition-base);
  margin-left: var(--space-2);
}

.sidebar-logo-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: all var(--transition-base);
  margin-left: var(--space-2);
}

.sidebar-logo-icon svg {
  width: 32px;
  height: 32px;
}

.sidebar.collapsed .sidebar-logo-icon {
  width: 52px;
  height: 52px;
}

.sidebar.collapsed .sidebar-logo-icon svg {
  width: 28px;
  height: 28px;
}

.sidebar-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
  width: 100%;
  padding-left: var(--space-2);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3);
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--space-6);
}

.nav-section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.nav-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.nav-item.active {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.nav-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.7;
}

.nav-item:hover .nav-item-icon,
.nav-item.active .nav-item-icon {
  opacity: 1;
}

/* Main Content Area */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-base);
}

.sidebar.collapsed ~ .main-content {
  margin-left: var(--sidebar-collapsed-width);
}

/* Top Bar / Header */
.top-bar {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-4);
  z-index: var(--z-sticky);
}

/* Search / Command Palette Trigger */
.search-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 280px;
}

.search-trigger:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-border-focus);
}

.search-trigger-icon {
  width: 16px;
  height: 16px;
  opacity: 0.5;
}

.search-trigger-text {
  flex: 1;
  text-align: left;
}

.search-trigger-shortcut {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 var(--space-1);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-family: var(--font-family);
}

/* Page Content */
.page-content {
  flex: 1;
  padding: var(--space-6);
  max-width: var(--content-max-width);
}

.page-header {
  margin-bottom: var(--space-6);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-2) 0;
}

.page-description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Spacing */
.m-0 { margin: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

/* Text */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }

/* Visibility */
.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  
  .page-content {
    padding: var(--space-4);
  }
  
  .search-trigger {
    min-width: auto;
    flex: 1;
  }
}