/* ============================================================
   perdimilibro — Sistema de diseño
   ============================================================ */

:root {
  /* Paleta */
  --ink: #1a1410;
  --ink-soft: #3a2f24;
  --paper: #f6ecd9;
  --paper-warm: #efe2c5;
  --paper-deep: #e8d8b3;
  --navy: #1d2d44;
  --navy-deep: #14223a;
  --navy-soft: #2c4068;
  --terracotta: #b85c38;
  --terracotta-soft: #d4825a;
  --olive: #6b7a3d;
  --sage: #a8b08b;
  --dusty-rose: #c89090;
  --lavender: #b0a0c0;
  --line: rgba(26, 20, 16, 0.12);
  --line-strong: rgba(26, 20, 16, 0.22);

  /* Tipografía */
  --serif: 'Fraunces', 'Cormorant Garamond', Georgia, serif;
  --sans: 'Karla', 'DM Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  /* Espaciado */
  --gap-xs: 0.25rem;
  --gap-sm: 0.5rem;
  --gap-md: 1rem;
  --gap-lg: 1.5rem;
  --gap-xl: 2.5rem;

  /* Sombras */
  --shadow-sm: 0 1px 2px rgba(20, 34, 58, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 34, 58, 0.08);
  --shadow-lg: 0 12px 40px rgba(20, 34, 58, 0.16);

  /* Bordes */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
}

/* ============================================================
   Reset y base
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
  font-variation-settings: 'opsz' 144, 'SOFT' 30;
}

h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.1; }
h2 { font-size: clamp(1.4rem, 3vw, 1.85rem); line-height: 1.2; }
h3 { font-size: 1.2rem; line-height: 1.3; }
h4 { font-size: 1rem; }

a { color: var(--navy); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--terracotta); }

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: var(--ink);
}

/* ============================================================
   Header
   ============================================================ */

.app-header {
  background: var(--navy);
  color: var(--paper);
  padding: var(--gap-lg) var(--gap-xl);
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 80% 50%, rgba(184, 92, 56, 0.12), transparent 60%),
    radial-gradient(ellipse at 20% 100%, rgba(107, 122, 61, 0.08), transparent 50%);
  pointer-events: none;
}

.app-header-inner {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--gap-md);
  max-width: 1400px;
  margin: 0 auto;
}

.brand h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  color: var(--paper);
  font-variation-settings: 'opsz' 144, 'SOFT' 100;
  font-size: clamp(2rem, 5vw, 3rem);
}

.brand .tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--paper-deep);
  opacity: 0.85;
  margin-top: 0.15rem;
  font-weight: 300;
}

.household-switcher {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  font-size: 0.9rem;
  color: var(--paper-deep);
}

.household-switcher select {
  background: rgba(246, 236, 217, 0.1);
  color: var(--paper);
  border: 1px solid rgba(246, 236, 217, 0.3);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.household-switcher select:focus { outline: 2px solid var(--terracotta-soft); outline-offset: 1px; }

/* ============================================================
   Toolbar
   ============================================================ */

.toolbar {
  background: var(--paper-warm);
  border-bottom: 1px solid var(--line);
  padding: var(--gap-md) var(--gap-xl);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.toolbar-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:hover { background: var(--paper-deep); border-color: var(--ink-soft); }

.btn.primary {
  background: var(--navy);
  color: var(--paper);
  border-color: var(--navy);
}
.btn.primary:hover { background: var(--navy-deep); }

.btn.accent {
  background: var(--terracotta);
  color: var(--paper);
  border-color: var(--terracotta);
}
.btn.accent:hover { background: #9d4a2a; }

.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--paper-deep); }

.btn.small { padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.btn.danger { color: #8a2418; border-color: #8a2418; }
.btn.danger:hover { background: #8a2418; color: var(--paper); }

.btn.icon-only { padding: 0.5rem; }

.search {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search input {
  width: 100%;
  padding: 0.55rem 0.9rem 0.55rem 2.2rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper);
  font-size: 0.92rem;
}

.search input:focus {
  outline: 2px solid var(--navy-soft);
  outline-offset: -1px;
  border-color: transparent;
}

.search::before {
  content: '⌕';
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-soft);
  font-size: 1.1rem;
}

select.filter {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper);
  font-size: 0.9rem;
  cursor: pointer;
  min-width: 150px;
}

.view-toggle {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.view-toggle button {
  padding: 0.5rem 0.85rem;
  background: var(--paper);
  font-size: 0.85rem;
  border-right: 1px solid var(--line-strong);
}

.view-toggle button:last-child { border-right: none; }

.view-toggle button.active {
  background: var(--navy);
  color: var(--paper);
}

/* ============================================================
   Stats bar
   ============================================================ */

.stats {
  display: flex;
  gap: var(--gap-xl);
  padding: var(--gap-md) var(--gap-xl);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  max-width: 1400px;
  margin: 0 auto;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
}

.stat strong {
  font-family: var(--sans);
  font-style: normal;
  font-weight: 600;
  color: var(--navy);
  margin-right: 0.35rem;
}

/* ============================================================
   Main canvas
   ============================================================ */

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--gap-lg) var(--gap-xl);
  min-height: 60vh;
}

/* ============================================================
   Empty state — biblioteca ilustrada
   ============================================================ */

.empty-state {
  position: relative;
  padding: 4rem 1rem;
  text-align: center;
  background:
    linear-gradient(180deg, transparent 0%, transparent 60%, rgba(26, 20, 16, 0.04) 100%),
    var(--paper-warm);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 500px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.empty-state .shelves {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
}

.empty-state .message {
  position: relative;
  background: rgba(246, 236, 217, 0.96);
  padding: 2.5rem 3rem;
  border-radius: var(--radius-md);
  max-width: 480px;
  z-index: 2;
}

.empty-state h2 {
  color: var(--navy);
  font-style: italic;
  font-weight: 400;
  margin-bottom: var(--gap-md);
}

.empty-state p {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin: 0 0 var(--gap-lg) 0;
}

.empty-actions { display: flex; gap: var(--gap-sm); justify-content: center; flex-wrap: wrap; }

/* ============================================================
   Lista de libros
   ============================================================ */

.book-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.book-row {
  display: grid;
  grid-template-columns: 60px 1fr auto auto auto;
  gap: var(--gap-md);
  padding: var(--gap-md);
  background: var(--paper);
  align-items: center;
  cursor: pointer;
  transition: background 0.12s;
}

.book-row:hover { background: var(--paper-warm); }

.book-row .cover {
  width: 50px;
  height: 70px;
  object-fit: cover;
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
  background: var(--paper-deep);
}

.book-row .cover-placeholder {
  width: 50px;
  height: 70px;
  background: linear-gradient(135deg, var(--sage), var(--dusty-rose));
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-style: italic;
  color: var(--paper);
  font-size: 0.7rem;
  text-align: center;
  padding: 0.2rem;
  line-height: 1;
}

.book-info h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.05rem;
  margin-bottom: 0.15rem;
  color: var(--ink);
}

.book-info .authors {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.book-meta { font-size: 0.82rem; color: var(--ink-soft); font-style: italic; }

.badge {
  display: inline-block;
  padding: 0.18rem 0.55rem;
  border-radius: 10px;
  font-size: 0.72rem;
  font-weight: 500;
  background: var(--paper-deep);
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.badge.lent { background: #c89090; color: #4a1a14; }
.badge.home { background: var(--sage); color: #2a3318; }
.badge.reading { background: var(--lavender); color: #2e1f44; }
.badge.lost { background: #6b6b6b; color: var(--paper); }
.badge.wishlist { background: var(--terracotta-soft); color: #4a1a08; }

/* ============================================================
   Galería
   ============================================================ */

.book-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--gap-lg);
}

.gallery-card {
  cursor: pointer;
  transition: transform 0.2s;
}

.gallery-card:hover { transform: translateY(-4px); }

.gallery-card .cover-wrap {
  aspect-ratio: 2/3;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--paper-deep);
  position: relative;
}

.gallery-card .cover-wrap img,
.gallery-card .cover-wrap .cover-placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  font-size: 0.9rem;
}

.gallery-card .title {
  font-family: var(--serif);
  font-size: 0.92rem;
  margin-top: var(--gap-sm);
  color: var(--ink);
  line-height: 1.25;
  font-weight: 500;
}

.gallery-card .author {
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-top: 0.1rem;
}

/* ============================================================
   Grupos (por ubicación / materia)
   ============================================================ */

.group-section {
  margin-bottom: var(--gap-xl);
}

.group-header {
  display: flex;
  align-items: baseline;
  gap: var(--gap-md);
  margin-bottom: var(--gap-md);
  padding-bottom: var(--gap-sm);
  border-bottom: 1px solid var(--line);
}

.group-header h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-style: italic;
  color: var(--navy);
}

.group-header .count {
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-style: normal;
}

/* ============================================================
   Modal
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 22, 30, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 3rem 1rem 1rem;
  z-index: 100;
  overflow-y: auto;
  animation: fade-in 0.2s ease;
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--paper);
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: slide-up 0.25s ease;
  position: relative;
}

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

.modal-header {
  padding: var(--gap-lg) var(--gap-xl);
  background: var(--navy);
  color: var(--paper);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-style: italic;
  font-weight: 400;
  color: var(--paper);
  font-size: 1.5rem;
}

.modal-close {
  background: rgba(246, 236, 217, 0.15);
  color: var(--paper);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  line-height: 1;
  transition: background 0.15s;
}

.modal-close:hover { background: var(--terracotta); }

.modal-body { padding: var(--gap-xl); }

.modal-footer {
  padding: var(--gap-md) var(--gap-xl);
  background: var(--paper-warm);
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: flex-end;
  gap: var(--gap-sm);
}

/* ============================================================
   Formularios
   ============================================================ */

.field {
  margin-bottom: var(--gap-md);
}

.field label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
  font-weight: 600;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper);
  font-size: 0.95rem;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--navy-soft);
  outline-offset: -1px;
  border-color: transparent;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-md);
}

.field-hint {
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-top: 0.25rem;
  font-style: italic;
}

/* ============================================================
   Scanner
   ============================================================ */

#reader {
  width: 100%;
  max-width: 500px;
  margin: 0 auto var(--gap-md);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink);
  position: relative;
}

#reader video { display: block; width: 100%; }

.scanner-status {
  text-align: center;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: var(--gap-md) 0;
}

.scanner-status.found { color: var(--olive); font-style: normal; font-weight: 600; }

/* ============================================================
   Detalle de libro
   ============================================================ */

.book-detail {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--gap-xl);
}

@media (max-width: 600px) {
  .book-detail { grid-template-columns: 1fr; }
  .book-detail .cover-wrap { max-width: 180px; margin: 0 auto; }
}

.book-detail .cover-wrap {
  aspect-ratio: 2/3;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.book-detail h2 {
  font-family: var(--serif);
  font-weight: 500;
  margin-bottom: var(--gap-xs);
  color: var(--ink);
}

.book-detail .authors {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin-bottom: var(--gap-lg);
}

.detail-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1.5rem;
  font-size: 0.92rem;
  margin-bottom: var(--gap-lg);
}

.detail-grid dt {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  font-weight: 600;
  align-self: center;
}

.detail-grid dd {
  margin: 0;
  color: var(--ink);
}

/* ============================================================
   Ubicaciones (árbol)
   ============================================================ */

.locations-tree { list-style: none; padding: 0; margin: 0; }

.locations-tree li {
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--line);
}

.locations-tree ul {
  list-style: none;
  padding-left: 1.5rem;
  margin: 0.5rem 0 0 0;
  border-left: 2px solid var(--line);
}

.location-row {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.location-row .name { flex: 1; font-family: var(--serif); }
.location-row .count {
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-family: var(--sans);
}

/* ============================================================
   Préstamos
   ============================================================ */

.loans-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.loan-card {
  background: var(--paper-warm);
  border-left: 4px solid var(--terracotta);
  padding: var(--gap-md);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--gap-md);
  align-items: center;
}

.loan-card.overdue { border-left-color: #8a2418; background: #f5e0d8; }

.loan-info h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.loan-info .meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-style: italic;
}

/* ============================================================
   Footer
   ============================================================ */

.app-footer {
  background: var(--navy-deep);
  color: var(--paper-deep);
  padding: var(--gap-xl);
  margin-top: var(--gap-xl);
  text-align: center;
  font-size: 0.85rem;
}

.app-footer a {
  color: var(--paper);
  margin: 0 var(--gap-sm);
}

.app-footer .signature {
  font-family: var(--serif);
  font-style: italic;
  margin-top: var(--gap-md);
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ============================================================
   Toasts
   ============================================================ */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy);
  color: var(--paper);
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  font-size: 0.9rem;
  animation: toast-in 0.25s ease;
}

.toast.success { background: var(--olive); }
.toast.error { background: #8a2418; }

@keyframes toast-in {
  from { transform: translate(-50%, 20px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

/* ============================================================
   Páginas legales (terminos, privacidad)
   ============================================================ */

.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--gap-xl);
  background: var(--paper);
}

.legal-page h1 {
  font-style: italic;
  color: var(--navy);
  margin-bottom: var(--gap-sm);
}

.legal-page .meta {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  margin-bottom: var(--gap-xl);
  padding-bottom: var(--gap-md);
  border-bottom: 1px solid var(--line);
}

.legal-page h2 {
  margin-top: var(--gap-xl);
  margin-bottom: var(--gap-md);
  color: var(--navy);
  font-weight: 500;
}

.legal-page h3 {
  margin-top: var(--gap-lg);
  margin-bottom: var(--gap-sm);
  color: var(--ink);
}

.legal-page p, .legal-page li { font-size: 0.98rem; line-height: 1.7; }

.legal-page ul, .legal-page ol { padding-left: 1.5rem; }

/* ============================================================
   Mobile
   ============================================================ */

@media (max-width: 720px) {
  .app-header { padding: var(--gap-lg) var(--gap-md); }
  .toolbar { padding: var(--gap-md); }
  main { padding: var(--gap-md); }
  .stats { padding: var(--gap-md); gap: var(--gap-md); flex-wrap: wrap; }
  .book-row { grid-template-columns: 50px 1fr auto; }
  .book-row .location, .book-row .badge { display: none; }
  .field-row { grid-template-columns: 1fr; }
  .modal-body { padding: var(--gap-md); }
  .modal-header { padding: var(--gap-md); }
}

/* ============================================================
   Utilities
   ============================================================ */

.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--ink-soft); }
.italic { font-style: italic; }
.serif { font-family: var(--serif); }

.divider {
  height: 1px;
  background: var(--line);
  margin: var(--gap-lg) 0;
  border: none;
}