/* ============================================
   BIBLIOTECA FINCAS — Design System
   Modern ERP-inspired layout
   ============================================ */

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

/* --- Custom Properties --- */
:root {
  /* Colors */
  --c-primary: #2563eb;
  --c-primary-hover: #1d4ed8;
  --c-primary-light: #dbeafe;
  --c-primary-dark: #1e40af;

  --c-success: #16a34a;
  --c-success-light: #dcfce7;
  --c-warning: #d97706;
  --c-warning-light: #fef3c7;
  --c-danger: #dc2626;
  --c-danger-light: #fee2e2;
  --c-info: #0891b2;
  --c-info-light: #cffafe;

  --c-bg: #f8fafc;
  --c-surface: #ffffff;
  --c-surface-alt: #f1f5f9;
  --c-border: #e2e8f0;
  --c-border-light: #f1f5f9;

  --c-text: #0f172a;
  --c-text-secondary: #64748b;
  --c-text-muted: #94a3b8;

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed: 64px;
  --sidebar-bg: #0f172a;
  --sidebar-text: #cbd5e1;
  --sidebar-active: #2563eb;
  --sidebar-hover: #1e293b;

  /* Topbar */
  --topbar-height: 60px;

  /* Spacing */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;

  /* Radius */
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);

  /* Transitions */
  --t-fast: 150ms ease;
  --t-normal: 200ms ease;
  --t-slow: 300ms ease;

  /* Font */
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
}

/* --- Base --- */
html, body { height: 100%; margin: 0; padding: 0; }
html { font-size: 14px; }
body {
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

[x-cloak] { display: none !important; }

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Layout: Sidebar + Main --- */
.app-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* --- Sidebar --- */
.sidebar {
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  z-index: 40;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}
.sidebar-collapsed .sidebar {
  width: var(--sidebar-collapsed);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-lg) var(--sp-md);
  border-bottom: 1px solid rgba(255,255,255,.08);
  height: var(--topbar-height);
}
.sidebar-brand svg { flex-shrink: 0; }
.sidebar-brand-text {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-collapsed .sidebar-brand-text { opacity: 0; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-sm) 0;
}

.sidebar-section {
  padding: var(--sp-md) var(--sp-md) var(--sp-xs);
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--c-text-muted);
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-collapsed .sidebar-section { opacity: 0; height: 0; padding: 0; }

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-sm) var(--sp-md);
  margin: 1px var(--sp-sm);
  border-radius: var(--r-md);
  color: var(--sidebar-text);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
  white-space: nowrap;
  font-size: .9rem;
}
.sidebar-link:hover {
  background: var(--sidebar-hover);
  color: #fff;
  text-decoration: none;
}
.sidebar-link.active {
  background: var(--sidebar-active);
  color: #fff;
}
.sidebar-link svg { flex-shrink: 0; width: 20px; height: 20px; }
.sidebar-link .badge {
  margin-left: auto;
  background: var(--c-danger);
  color: #fff;
  font-size: .7rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--r-full);
  min-width: 18px;
  text-align: center;
}
.sidebar-collapsed .sidebar-link span:not(.badge) { opacity: 0; }
.sidebar-collapsed .sidebar-link .badge { position: absolute; right: 4px; top: 4px; }

.sidebar-footer {
  padding: var(--sp-md);
  border-top: 1px solid rgba(255,255,255,.08);
}

/* --- Main Area --- */
.main-area {
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: calc(100% - var(--sidebar-width));
}
.sidebar-collapsed .main-area {
  margin-left: var(--sidebar-collapsed);
  width: calc(100% - var(--sidebar-collapsed));
}

/* --- Topbar --- */
.topbar {
  height: var(--topbar-height);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  padding: 0 var(--sp-lg);
  gap: var(--sp-md);
  position: sticky;
  top: 0;
  z-index: 30;
}
.topbar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  border-radius: var(--r-md);
  cursor: pointer;
  color: var(--c-text-secondary);
  transition: background var(--t-fast);
}
.topbar-toggle:hover { background: var(--c-surface-alt); }

.topbar-search {
  flex: 1;
  max-width: 400px;
  position: relative;
}
.topbar-search input {
  width: 100%;
  height: 38px;
  padding: 0 var(--sp-md) 0 36px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  font-size: .9rem;
  background: var(--c-surface-alt);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.topbar-search input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-light);
  background: var(--c-surface);
}
.topbar-search svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--c-text-muted);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  margin-left: auto;
}
.topbar-icon-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  border-radius: var(--r-md);
  cursor: pointer;
  color: var(--c-text-secondary);
  transition: background var(--t-fast);
}
.topbar-icon-btn:hover { background: var(--c-surface-alt); }
.topbar-icon-btn .dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--c-danger);
  border-radius: 50%;
  border: 2px solid var(--c-surface);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-xs) var(--sp-sm);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: background var(--t-fast);
}
.topbar-user:hover { background: var(--c-surface-alt); }
.topbar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: .85rem;
}
.topbar-user-name { font-size: .85rem; font-weight: 500; }

/* --- Content --- */
.content {
  flex: 1;
  padding: var(--sp-lg);
}

/* --- Auth Screen --- */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2563eb 100%);
  padding: var(--sp-lg);
}
.auth-card {
  background: var(--c-surface);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
  padding: var(--sp-2xl);
}
.auth-card h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--sp-xs);
}
.auth-card p {
  color: var(--c-text-secondary);
  margin-bottom: var(--sp-xl);
}
.auth-card .logo {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-xl);
}
.auth-card .logo svg { color: var(--c-primary); }

/* --- Cards --- */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}
.card-header {
  padding: var(--sp-md) var(--sp-lg);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-header h2 { font-size: 1rem; font-weight: 600; }
.card-body { padding: var(--sp-lg); }

/* --- KPI Cards --- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
}
.kpi-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--sp-md);
  box-shadow: var(--shadow-sm);
}
.kpi-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.kpi-icon.blue { background: var(--c-primary-light); color: var(--c-primary); }
.kpi-icon.green { background: var(--c-success-light); color: var(--c-success); }
.kpi-icon.yellow { background: var(--c-warning-light); color: var(--c-warning); }
.kpi-icon.red { background: var(--c-danger-light); color: var(--c-danger); }
.kpi-icon.cyan { background: var(--c-info-light); color: var(--c-info); }

.kpi-value { font-size: 1.75rem; font-weight: 700; line-height: 1.2; }
.kpi-label { font-size: .8rem; color: var(--c-text-secondary); margin-top: 2px; }

/* --- Tables --- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}
thead { background: var(--c-surface-alt); }
th {
  padding: var(--sp-sm) var(--sp-md);
  text-align: left;
  font-weight: 600;
  color: var(--c-text-secondary);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .03em;
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}
td {
  padding: var(--sp-sm) var(--sp-md);
  border-bottom: 1px solid var(--c-border-light);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--c-surface-alt); }

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--r-full);
  font-size: .75rem;
  font-weight: 600;
  white-space: nowrap;
}
.badge-success { background: var(--c-success-light); color: var(--c-success); }
.badge-warning { background: var(--c-warning-light); color: var(--c-warning); }
.badge-danger { background: var(--c-danger-light); color: var(--c-danger); }
.badge-info { background: var(--c-info-light); color: var(--c-info); }
.badge-neutral { background: var(--c-surface-alt); color: var(--c-text-secondary); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
  font-family: var(--font);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-hover); }
.btn-secondary { background: var(--c-surface); border-color: var(--c-border); color: var(--c-text); }
.btn-secondary:hover { background: var(--c-surface-alt); }
.btn-danger { background: var(--c-danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-success { background: var(--c-success); color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-ghost { background: none; color: var(--c-text-secondary); }
.btn-ghost:hover { background: var(--c-surface-alt); color: var(--c-text); }
.btn-sm { padding: 4px 10px; font-size: .8rem; }
.btn-icon { padding: 6px; }

/* --- Forms --- */
.form-group { margin-bottom: var(--sp-md); }
.form-label {
  display: block;
  font-size: .8rem;
  font-weight: 500;
  color: var(--c-text-secondary);
  margin-bottom: var(--sp-xs);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  font-size: .9rem;
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-surface);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-light);
}
.form-textarea { min-height: 80px; resize: vertical; }
.form-error { color: var(--c-danger); font-size: .8rem; margin-top: var(--sp-xs); }
.form-hint { color: var(--c-text-muted); font-size: .8rem; margin-top: var(--sp-xs); }

/* --- Grid helpers --- */
.grid { display: grid; gap: var(--sp-md); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--sp-sm); }
.gap-md { gap: var(--sp-md); }
.gap-lg { gap: var(--sp-lg); }
.mt-md { margin-top: var(--sp-md); }
.mt-lg { margin-top: var(--sp-lg); }
.mb-md { margin-bottom: var(--sp-md); }
.mb-lg { margin-bottom: var(--sp-lg); }

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: var(--sp-lg);
}
.modal {
  background: var(--c-surface);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-header {
  padding: var(--sp-lg);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h2 { font-size: 1.1rem; font-weight: 600; }
.modal-body { padding: var(--sp-lg); }
.modal-footer {
  padding: var(--sp-md) var(--sp-lg);
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-sm);
}

/* --- Toast --- */
.toast-container {
  position: fixed;
  top: var(--sp-lg);
  right: var(--sp-lg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-md) var(--sp-lg);
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  min-width: 300px;
  max-width: 450px;
  animation: slideIn .3s ease;
  font-size: .875rem;
}
.toast.success { border-left: 4px solid var(--c-success); }
.toast.error { border-left: 4px solid var(--c-danger); }
.toast.info { border-left: 4px solid var(--c-info); }
.toast.warning { border-left: 4px solid var(--c-warning); }
.toast-close {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-text-muted);
  padding: 2px;
}

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

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: var(--sp-2xl) var(--sp-lg);
  color: var(--c-text-muted);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: var(--sp-md); opacity: .4; }
.empty-state h3 { font-size: 1rem; color: var(--c-text-secondary); margin-bottom: var(--sp-xs); }
.empty-state p { font-size: .85rem; margin-bottom: var(--sp-lg); }

/* --- Book Grid --- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--sp-md);
}
.book-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow var(--t-fast), transform var(--t-fast);
}
.book-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.book-card-cover {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  background: var(--c-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  font-size: 2rem;
}
.book-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.book-card-body { padding: var(--sp-md); }
.book-card-title {
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: 2px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-card-author { font-size: .8rem; color: var(--c-text-secondary); margin-bottom: var(--sp-sm); }
.book-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .75rem;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: var(--sp-lg);
}
.tab {
  padding: var(--sp-sm) var(--sp-md);
  font-size: .875rem;
  font-weight: 500;
  color: var(--c-text-secondary);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.tab:hover { color: var(--c-text); }
.tab.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

/* --- Dropdown --- */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--sp-xs);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  z-index: 50;
  padding: var(--sp-xs);
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  border-radius: var(--r-sm);
  font-size: .85rem;
  color: var(--c-text);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--font);
}
.dropdown-item:hover { background: var(--c-surface-alt); }
.dropdown-divider { height: 1px; background: var(--c-border); margin: var(--sp-xs) 0; }

/* --- Utility: Visibility --- */
@media (max-width: 768px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--t-slow);
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .main-area { margin-left: 0 !important; }
  .topbar-search { display: none; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .content { padding: var(--sp-md); }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
}