:root {
  --ink-900: #121417;
  --ink-700: #2f363f;
  --ink-500: #4f5a66;
  --paper-100: #fbfaf7;
  --paper-200: #f0ede6;
  --accent-700: #0f4c6f;
  --accent-800: #0b3b57;
  --line: #d8d2c5;
  --shadow: 0 22px 40px rgba(18, 20, 23, 0.09);
  /* Revertido a estilos originales */
}

* {
  box-sizing: border-box;
  /* Revertido a estilos originales */
}

body {
  margin: 0;
  color: var(--ink-900);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, #e5edf2 0%, #f5f2eb 45%, #f9f7f2 100%);
}

.container {
  width: min(1140px, calc(100% - 2.4rem));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fcfaf5 0%, #f6f2e9 100%);
}

.brand-wrap {
  padding: 2.4rem 0 2rem;
}

.official-strip {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
}

.seal-badge {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background: #12354b;
  color: #fff;
  font-family: "Merriweather", Georgia, serif;
  font-size: 1.45rem;
  font-family: inherit;
  font-weight: 600;
  border: none;
  /* Revertido a estilos originales */
}

.edition-tag {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.74rem;
  color: var(--ink-500);
}

.brand {
  margin: 0.3rem 0 0;
  font-family: "Merriweather", Georgia, serif;
  font-size: clamp(2.2rem, 4.8vw, 3.8rem);
  line-height: 1.04;
  font-weight: 900;
}

.claim {
  margin: 0.8rem 0 0;
  max-width: 780px;
  color: var(--ink-700);
  font-size: 1.06rem;
}

.home-layout {
  display: grid;
  grid-template-columns: 1.75fr 1fr;
  gap: 1.2rem;
  padding: 1.6rem 0 2.4rem;
}

.hero-card,
.sidebar-card,
.viewer-shell,
.viewer-message {
  border: 1px solid var(--line);
  border-radius: 16px;
  background-color: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 1.8rem;
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: -40% -22% auto auto;
  width: 240px;
  height: 18px;
  border-radius: 10px;
  vertical-align: middle;
}

.hero-label {
  display: inline-block;
  background: #143f57;
  color: #fff;
  border-radius: 999px;
  padding: 0.38rem 0.84rem;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.hero-card h2 {
  margin: 1rem 0 0;
  font-family: "Merriweather", Georgia, serif;
  font-size: clamp(1.7rem, 3.7vw, 2.6rem);
  line-height: 1.15;
}

.hero-date {
  margin: 0.35rem 0 0;
  font-size: 1.03rem;
  color: var(--ink-700);
}

.meta-ribbon {
  margin: 0.9rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid rgba(18, 52, 74, 0.22);
  background: rgba(255, 255, 255, 0.95);
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #173b53;
  letter-spacing: 0.01em;
}

.meta-pill.is-live {
  border-color: rgba(24, 104, 69, 0.34);
  color: #175f43;
}

.hero-copy {
  margin: 1rem 0 1.3rem;
  max-width: 60ch;
  color: var(--ink-700);
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.68rem 1.18rem;
  font-weight: 600;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
  border: 1px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-700), var(--accent-800));
  color: #fff;
  box-shadow: 0 12px 26px rgba(15, 76, 111, 0.22);
}

.btn-secondary {
  color: var(--accent-800);
  border-color: rgba(11, 59, 87, 0.35);
  background: rgba(255, 255, 255, 0.75);
}

.btn-small {
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
}

.sidebar-card {
  padding: 1.4rem 1.2rem;
}

.sidebar-card h3 {
  margin: 0;
  font-family: "Merriweather", Georgia, serif;
  font-size: 1.34rem;
}

.recent-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.recent-list li+li {
  margin-top: 0.6rem;
}

.recent-list a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.recent-list a:hover {
  border-color: var(--ink-500);
}

.sidebar-note {
  margin: 1rem 0 0;
  color: var(--ink-500);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #f5f1e8;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0;
  color: var(--ink-700);
  font-size: 0.92rem;
}

.viewer-body {
  height: 100vh;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
}

.viewer-topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(246, 242, 234, 0.96);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 3;
}

.topbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.4rem 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.back-link {
  color: var(--accent-800);
  text-decoration: none;
  font-weight: 600;
}

.back-link:hover {
  text-decoration: underline;
}

.topbar-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.1rem;
  color: var(--ink-700);
  font-size: 0.85rem;
}

.topbar-chips {
  margin-top: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.38rem;
}

.viewer-main {
  padding: 0;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.viewer-shell {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  border-radius: 0;
}

.viewer-app {
  display: block;
  height: 100%;
  background: #141414;
}

.thumbs-panel {
  display: none;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  background: #1e1e1e;
  overflow: auto;
}

.thumbs-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.75rem;
}

.thumb-item {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 0.45rem;
  background: #2a2a2a;
  cursor: pointer;
}

.thumb-item.is-active {
  border-color: #4a8ab5;
  box-shadow: 0 0 0 2px rgba(74, 138, 181, 0.3);
}

.thumb-item canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

.thumb-label {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  color: #aaa;
  text-align: center;
}

.reader-panel {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-width: 0;
  height: 100%;
}

.reader-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  min-height: 2.2rem;
  flex-wrap: wrap;
}

.control-group {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.control-group-search {
  margin-left: auto;
}

.control-btn,
.control-pill {
  border-radius: 999px;
  padding: 0.34rem 0.72rem;
  font-size: 0.85rem;
}

.control-btn {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: #2a2a2a;
  color: #ddd;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.control-btn:hover {
  background: #3a3a3a;
}

.control-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.control-pill {
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: #ccc;
  font-weight: 600;
}

.search-input {
  min-width: 220px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: #2a2a2a;
  padding: 0.42rem 0.8rem;
  font: inherit;
  color: #eee;
}

.search-input:focus {
  outline: 2px solid rgba(15, 76, 111, 0.18);
  border-color: rgba(15, 76, 111, 0.4);
}

.reader-stage-wrap {
  display: flex;
  align-items: stretch;
  min-height: 0;
  overflow: hidden;
  background: #1a1a1a;
}

.nav-arrow {
  flex-shrink: 0;
  width: 56px;
  border: none;
  color: rgba(255, 255, 255, 0.92);
  font-size: 3.4rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s;
  z-index: 4;
  padding: 0;
}

.nav-arrow-left {
  background: linear-gradient(to right, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 100%);
}

.nav-arrow-right {
  background: linear-gradient(to left, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 100%);
}

.nav-arrow:hover {
  background: rgba(0, 0, 0, 0.72);
}

.nav-arrow:disabled {
  opacity: 0.15;
  cursor: not-allowed;
}

.reader-stage {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  background: #1a1a1a;
  position: relative;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.reader-stage.is-panning {
  cursor: grabbing;
}

#pdf-viewport {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: top left;
}

.reader-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(20, 20, 20, 0.92);
  gap: 0.9rem;
  z-index: 5;
  font-size: 1rem;
  color: #ccc;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.loading-spinner {
  width: 42px;
  height: 42px;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: #4a8ab5;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.pdf-spread {
  display: inline-flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.8rem;
  flex-shrink: 0;
}

#flip-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.2rem;
  padding: 0.7rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: #181818;
  border-radius: 1.2rem;
  min-height: 3.2rem;
  font-size: 1.18rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.10);
  flex-wrap: wrap;
  border-radius: 10px;
  box-shadow: 0 20px 34px rgba(0, 0, 0, 0.18);
}

#flip-front,
#flip-back {
  position: absolute;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 10px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.38);
}

#flip-back {
  transform: rotateY(180deg);
}

.bar-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.35rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  height: 48px;
  min-width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  flex-shrink: 0;
}

.bar-icon-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.bar-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.22rem;
  padding: 0.32em 1.3em;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  flex-shrink: 0;
  white-space: nowrap;
}

.bar-download-btn:hover {
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

#pdf-canvas-left,
#pdf-canvas-right {
  display: block;
  border-radius: 10px;
  box-shadow: 0 20px 34px rgba(0, 0, 0, 0.18);
  background: #fff;
  pointer-events: none;
}

.is-hidden {
  display: none !important;
}

.floating-bar {
  position: sticky;
  bottom: 0.75rem;
  margin: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 1.2rem;
  background: rgba(30, 30, 30, 0.97);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0.7rem 1.5rem;
  width: fit-content;
  max-width: calc(100% - 1.5rem);
  margin-left: auto;
  margin-right: auto;
  font-size: 1.18rem;
  min-height: 3.2rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.10);
}

.page-range {
  width: 160px;
}

.zoom-slider-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.zoom-range {
  -webkit-appearance: none;
  appearance: none;
  width: 160px;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  vertical-align: middle;
  margin: 0 0.3rem;
}

.zoom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.45);
}

.zoom-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.45);
}

.zoom-step-btn {
  font-size: 1.2rem;
  font-weight: 700;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-message h1 {
  margin: 0;
  font-family: "Merriweather", Georgia, serif;
  font-size: clamp(1.45rem, 2.8vw, 2rem);
}

.viewer-message p {
  margin: 0.8rem 0 1.2rem;
  color: var(--ink-700);
}

.hidden {
  display: none;
}

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

  .viewer-shell {
    min-height: 0;
  }

  .viewer-app {
    display: block;
  }

  .thumbs-panel {
    display: none;
  }

  .thumbs-list {
    display: none;
  }

  .thumb-item {
    display: none;
  }

  .pdf-spread {
    gap: 0.5rem;
  }

  .nav-arrow {
    width: 38px;
    font-size: 2.1rem;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(1140px, calc(100% - 1.3rem));
  }

  .brand-wrap {
    padding: 1.8rem 0 1.5rem;
  }

  .footer-content {
    flex-direction: column;
    padding: 1rem 0;
  }

  .topbar-content {
    flex-direction: column;
    align-items: stretch;
    gap: 0.8rem;
  }

  .topbar-actions {
    flex-direction: column;
    width: 100%;
    gap: 0.5rem;
  }

  .topbar-meta {
    align-items: flex-start;
    text-align: left;
  }

  .topbar-chips {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .btn,
  .btn-small,
  .search-input {
    width: 100%;
    min-width: 0;
    /* Allow shrinking below min-width */
  }

  .reader-controls {
    flex-direction: column;
    gap: 0.8rem;
    padding: 0.8rem 1rem;
  }

  .control-group {
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }

  .control-group-search {
    flex-direction: column;
    margin-left: 0;
    width: 100%;
    align-items: stretch;
  }

  .reader-stage {
    min-height: 50vh;
  }

  #pdf-canvas-right {
    display: none !important;
  }

  .floating-bar {
    border-radius: 12px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0.8rem;
    gap: 0.8rem;
    width: calc(100% - 1rem);
    margin: 0.5rem;
  }

  .page-range {
    width: 100%;
  }

  .pdf-nav {
    flex-wrap: wrap;
    padding: 0.5rem;
    gap: 0.5rem;
    border-radius: 8px;
    justify-content: center;
  }
}