:root {
  --bg: #f5f2ec;
  --surface: #fffaf2;
  --surface-2: #ede6db;
  --ink: #171511;
  --muted: #776f65;
  --line: rgba(23, 21, 17, .12);
  --accent: #9f2324;
  --accent-dark: #6f1719;
  --green: #446b54;
  --shadow: 0 18px 45px rgba(48, 36, 24, .10);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 999px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(159, 35, 36, .04), transparent 28rem),
    radial-gradient(circle at 90% 15%, rgba(68, 107, 84, .05), transparent 30rem),
    linear-gradient(180deg, #faf8f3 0%, var(--bg) 100%);
}

button,
a,
input {
  font: inherit;
}

a {
  color: inherit;
}

.index-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 52px;
}

.index-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 10px 0 18px;
  border-bottom: 1px solid var(--line);
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-logo {
  width: 136px;
  height: auto;
  display: block;
  flex: 0 0 auto;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.index-header h1 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1;
  letter-spacing: -.04em;
}

.header-note {
  display: none;
}

.index-toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(280px, 520px);
  gap: 16px;
  align-items: center;
  justify-content: start;
  padding: 18px 0;
  margin-bottom: 8px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(23, 21, 17, .08);
}

.search-box {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  min-height: 50px;
  padding: 0 18px;
  background: rgba(255, 250, 242, .82);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 25px rgba(38, 31, 22, .05);
  
}

.search-box span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.search-box input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 16px;
  min-width: 0;
  line-height: 1.25;

}

.search-box input::placeholder {
  color: #aaa197;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 250, 242, .64);
  color: var(--muted);
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.filter-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(159, 35, 36, .28);
}

.filter-chip.is-active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.result-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin: 6px 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-weight: 800;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.catalog-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 560px;
  padding: 14px;
  background: rgba(255, 250, 242, .82);
  border: 1px solid rgba(23, 21, 17, .10);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.catalog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 65px rgba(48, 36, 24, .15);
  border-color: rgba(159, 35, 36, .24);
}

.catalog-main-link {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  text-decoration: none;
}

.catalog-cover {
  margin: 0;
  aspect-ratio: 3 / 4;
  border-radius: 22px;
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid rgba(23, 21, 17, .10);
}

.catalog-cover img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  padding: 10px;
}

.catalog-info {
  flex: 1 1 auto;
  padding: 18px 4px 10px;
}

.catalog-volume {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.catalog-volume-number {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  letter-spacing: -.03em;
  box-shadow: 0 8px 20px rgba(159, 35, 36, .18);
}

.catalog-info h2 {
  margin: 0;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: .98;
  letter-spacing: -.055em;
}

.catalog-description {
  min-height: 42px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.catalog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.catalog-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 0 8px;
  border-radius: var(--radius-sm);
  background: #efe7da;
  color: #4d463f;
  font-size: 11px;
  font-weight: 750;
}

.catalog-tags .more-tag {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
}

.catalog-actions {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: stretch;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.catalog-actions a,
.catalog-actions span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 14px;
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
}

.action-open {
  background: var(--accent);
  color: #fff;
}

.action-pdf {
  background: transparent;
  color: var(--accent-dark);
  border: 1px solid rgba(159, 35, 36, .22);
}

.action-pdf.is-disabled {
  opacity: .45;
  pointer-events: none;
  border-style: dashed;
}

.empty-state {
  min-height: 160px;
  display: grid;
  place-items: center;
  margin-top: 16px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  color: var(--muted);
  background: rgba(255, 250, 242, .54);
}

/* Ajuste final: menú superior fijo en una línea */
.top-menu {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background: rgba(250, 248, 243, .88);
  border-bottom: 1px solid rgba(23, 21, 17, .10);
  backdrop-filter: blur(16px);
  box-shadow: 0 10px 34px rgba(48, 36, 24, .06);
}

.top-menu-inner {
  width: min(1180px, calc(100% - 40px));
  min-height: 78px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto minmax(190px, 1fr) minmax(320px, 460px);
  align-items: center;
  gap: 22px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.top-menu .brand-logo {
  width: 108px;
  max-height: 48px;
  object-fit: contain;
}

.menu-title-block {
  min-width: 0;
}

.top-menu .eyebrow {
  margin: 0 0 4px;
  font-size: 10px;
  letter-spacing: .14em;
}

.top-menu h1 {
  margin: 0;
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.05;
  letter-spacing: -.04em;
  white-space: nowrap;
}

.top-menu .search-box {
  width: 100%;
  min-height: 46px;
  padding: 0 16px;
  background: rgba(255, 250, 242, .94);
  box-shadow: none;
}

.top-menu .search-box input {
  font-size: 15px;
}

.index-shell {
  padding-top: 22px;
}

.result-bar {
  margin-top: 0;
}

@media (max-width: 820px) {
  .top-menu-inner {
    width: min(100% - 28px, 1180px);
    min-height: auto;
    padding: 12px 0;
    grid-template-columns: auto 1fr;
    gap: 12px 16px;
  }

  .top-menu .brand-logo {
    width: 94px;
  }

  .top-menu .search-box {
    grid-column: 1 / -1;
    grid-template-columns: 1fr;
  }
  .top-menu .search-box span {
    display: none;
  }

}

@media (max-width: 480px) {
  .top-menu-inner {
    width: min(100% - 22px, 1180px);
  }

  .top-menu .brand-logo {
    width: 82px;
  }

  .top-menu h1 {
    font-size: 18px;
  }

  .top-menu .search-box {
    min-height: 44px;
    padding: 0 14px;
  }

  .top-menu .search-box span {
    display: none;
  }
}

/* Viewer */
.page-viewer {
  background: #11100e;
  color: #fff;
}

.viewer-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 120px;
  gap: 18px;
  align-items: center;
  min-height: 78px;
  padding: 12px 18px;
  background: rgba(17, 16, 14, .92);
  border-bottom: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(14px);
}

.viewer-back,
.viewer-pdf,
.viewer-catalog-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 13px;
  font-weight: 850;
}

.viewer-back,
.viewer-pdf {
  min-height: 42px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
}

.viewer-back {
  color: #f3efe5;
  background: rgba(255,255,255,.08);
}

.viewer-back:hover {
  background: rgba(255,255,255,.14);
}

.viewer-pdf {
  justify-self: end;
  color: #fff;
  background: var(--accent);
}

.viewer-pdf:hover {
  background: #8f2025;
}

.viewer-center-area {
  min-width: 0;
  display: flex;
  justify-content: center;
}

.viewer-catalog-nav {
  width: min(820px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(170px, 1fr) auto minmax(170px, 1fr);
  align-items: center;
  justify-content: center;
  gap: 22px;
}

.viewer-catalog-btn {
  min-height: auto;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  color: rgba(255,255,255,.58);
  opacity: .42;
  flex-direction: column;
  gap: 3px;
  line-height: 1.1;
  pointer-events: auto;
  transition: opacity .18s ease, color .18s ease, background .18s ease, border-color .18s ease, transform .18s ease;
}

.viewer-catalog-btn-prev {
  align-items: flex-end;
  text-align: right;
}

.viewer-catalog-btn-next {
  align-items: flex-start;
  text-align: left;
}

.viewer-catalog-direction {
  font-size: 10px;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-weight: 900;
  color: rgba(255,255,255,.40);
}

.viewer-catalog-name {
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 800;
  color: rgba(255,255,255,.64);
}

.viewer-catalog-nav:hover .viewer-catalog-btn:not(.is-disabled),
.viewer-catalog-nav:focus-within .viewer-catalog-btn:not(.is-disabled) {
  opacity: .62;
}

.viewer-catalog-btn:not(.is-disabled):hover,
.viewer-catalog-btn:not(.is-disabled):focus-visible {
  opacity: 1;
  color: #fff;
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.14);
  transform: translateY(-1px);
}

.viewer-catalog-btn:not(.is-disabled):hover .viewer-catalog-direction,
.viewer-catalog-btn:not(.is-disabled):focus-visible .viewer-catalog-direction,
.viewer-catalog-btn:not(.is-disabled):hover .viewer-catalog-name,
.viewer-catalog-btn:not(.is-disabled):focus-visible .viewer-catalog-name {
  color: #fff;
}

.viewer-catalog-btn.is-disabled {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  cursor: default;
}

.viewer-title-block {
  min-width: 0;
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: left;
}

.viewer-title-content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  
}

.viewer-number {
  display: none;
}

.viewer-category {
  width: fit-content;
  margin: 0;
  padding: 4px 6px;
  display: inline-flex;
  align-items: center;
  border-radius: 4px;
  background: #fff;
  color: #11100e;
  font-size: 9px;
  font-weight: 950;
  line-height: 1;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.viewer-title-block h1 {
  max-width: 420px;
  margin: 0;
  overflow: hidden;
  color: #fff;
  font-size: clamp(15px, 1.75vw, 20px);
  line-height: 1.05;
  letter-spacing: -.035em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.viewer-empty-note {
  margin: 0;
  color: #c9beb0;
  font-size: 13px;
  font-weight: 700;
}

.viewer-layout {
  display: grid;
  grid-template-columns: 112px 1fr;
  min-height: calc(100vh - 78px);
}

.viewer-thumbs {
  height: calc(100vh - 78px);
  overflow: auto;
  padding: 14px 12px;
  background: rgba(255,255,255,.04);
  border-right: 1px solid rgba(255,255,255,.10);
}

.thumb-button {
  display: block;
  width: 100%;
  padding: 0;
  margin: 0 0 12px;
  border: 2px solid transparent;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  overflow: hidden;
  opacity: .62;
  transition: opacity .15s ease, border-color .15s ease;
}

.thumb-button.is-active {
  opacity: 1;
  border-color: #fff;
}

.thumb-button img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  background: #fff;
}

.viewer-main {
  position: relative;
  display: grid;
  place-items: center;
  padding: 28px 82px 52px;
}

.page-frame {
  display: grid;
  place-items: center;
  margin: 0;
  width: 100%;
}

.page-frame img {
  display: block;
  max-width: min(100%, 980px);
  max-height: calc(100vh - 172px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 18px;
  box-shadow: 0 24px 80px rgba(0,0,0,.42);
  background: #fff;
}

.page-frame figcaption {
  margin-top: 16px;
  color: #c9beb0;
  font-size: 13px;
  font-weight: 800;
}

.mobile-page-stack {
  display: none;
}

.mobile-page-frame {
  margin: 0;
}

.mobile-page-frame img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}

.mobile-page-frame figcaption {
  margin-top: 10px;
  color: #c9beb0;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.viewer-nav {
  position: absolute;
  top: 50%;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: 42px;
  line-height: 1;
  cursor: pointer;
  transform: translateY(-50%);
}

.viewer-nav:hover {
  background: rgba(255,255,255,.15);
}

.viewer-prev {
  left: 18px;
}

.viewer-next {
  right: 18px;
}

@media (max-width: 980px) {
  .index-toolbar {
    grid-template-columns: 1fr;
  }

  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .viewer-topbar {
    grid-template-columns: 1fr 1fr;
    justify-items: stretch;
    gap: 10px 12px;
    min-height: auto;
    padding: 10px 12px;
  }

  .viewer-back,
  .viewer-pdf {
    justify-self: stretch;
  }

  .viewer-center-area {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: stretch;
  }

  .viewer-catalog-nav {
    width: 100%;
    display: grid;
    grid-template-columns: minmax(70px, 1fr) minmax(0, 1.35fr) minmax(70px, 1fr);
    gap: 8px;
    align-items: center;
  }

  .viewer-catalog-btn {
    display: inline-flex;
    min-height: 38px;
    padding: 6px 8px;
    opacity: .82;
    background: rgba(255,255,255,.06);
    border-color: rgba(255,255,255,.10);
  }

  .viewer-catalog-name {
    display: none;
  }

  .viewer-title-block {
    justify-content: center;
    padding: 0 4px;
  }

  .viewer-title-block h1 {
    max-width: none;
    white-space: normal;
    font-size: 18px;
    text-align: center;
  }

  .viewer-layout {
    grid-template-columns: 1fr;
  }

  .viewer-thumbs {
    order: 2;
    height: auto;
    display: flex;
    overflow-x: auto;
    border-right: 0;
    border-top: 1px solid rgba(255,255,255,.10);
  }

  .thumb-button {
    flex: 0 0 78px;
    margin: 0 10px 0 0;
  }

  .viewer-main {
    min-height: calc(100vh - 230px);
    padding: 22px 58px 34px;
  }
}

@media (max-width: 640px) {
  .index-shell {
    width: min(100% - 24px, 1180px);
    padding-top: 18px;
  }

  .index-header {
    display: block;
  }

  .brand-block {
    align-items: flex-start;
    gap: 14px;
  }

  .brand-logo {
    width: 112px;
  }

  .header-note {
    display: none;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .catalog-card {
    min-height: auto;
  }

  .catalog-actions {
    grid-template-columns: 1fr;
  }

  .viewer-topbar {
    position: sticky;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .viewer-back,
  .viewer-pdf {
    min-height: 38px;
    padding: 0 10px;
    font-size: 12px;
  }

  .viewer-catalog-nav {
    grid-template-columns: minmax(64px, .8fr) minmax(0, 1.4fr) minmax(64px, .8fr);
    gap: 6px;
  }

  .viewer-catalog-btn {
    min-height: 34px;
    padding: 5px 6px;
  }

  .viewer-catalog-direction {
    font-size: 8px;
    letter-spacing: .08em;
  }

  .viewer-category {
    font-size: 8px;
    padding: 3px 5px;
  }

  .viewer-title-block h1 {
    font-size: 14px;
    line-height: 1.05;
  }

  .viewer-layout {
    display: block;
    min-height: auto;
  }

  .viewer-thumbs,
  .viewer-nav,
  .page-frame {
    display: none;
  }

  .viewer-main {
    display: block;
    min-height: auto;
    padding: 12px 10px 30px;
  }

  .mobile-page-stack {
    display: grid;
    gap: 18px;
    width: min(100%, 560px);
    margin: 0 auto;
  }

  .mobile-page-frame img {
    border-radius: 12px;
    box-shadow: 0 18px 48px rgba(0,0,0,.42);
  }
}