/* ==============================================================================
   CUADERNO - TEMA EDITORIAL DE LIBRO CÁLIDO & TERMINAL VINTAGE (PHP 8.4)
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400..700;1,400..700&family=JetBrains+Mono:wght@400;500&family=Lora:ital,wght@0,400..700;1,400..700&display=swap');

:root {
  --bg-parchment: #FBF8F2;
  --bg-card: #FFFFFF;
  --bg-card-subtle: #F6F1E7;
  --bg-code: #F3ECE1;
  --border-light: #E6DED2;
  --border-subtle: #D8CEBE;
  --border-accent: #C2B49F;

  --text-ink: #2B2621;
  --text-secondary: #6A6054;
  --text-muted: #968A7D;

  --accent-earth: #7D5638;
  --accent-earth-hover: #634329;
  --accent-terracotta: #A45037;

  --font-serif: 'Lora', 'EB Garamond', Georgia, serif;
  --font-heading: 'EB Garamond', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-parchment);
  color: var(--text-ink);
  font-family: var(--font-serif);
  font-size: 1.12rem;
  line-height: 1.78;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-earth);
  text-decoration: none;
  border-bottom: 1px dotted var(--border-accent);
  transition: all 0.15s ease;
}

a:hover {
  color: var(--accent-terracotta);
  border-bottom-style: solid;
}

/* Header */
.header-book {
  border-bottom: 1px solid var(--border-light);
  background-color: rgba(251, 248, 242, 0.95);
  backdrop-filter: blur(4px);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1.1rem 0;
}

.nav-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.logo-book {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-ink);
  border: none !important;
  border-bottom: none !important;
  text-decoration: none !important;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.15s ease;
}

.logo-book:hover {
  color: var(--accent-earth);
  border: none !important;
  border-bottom: none !important;
  text-decoration: none !important;
}

.logo-book .ornament {
  font-size: 1.65rem;
  color: var(--accent-earth);
  transition: transform 0.2s ease, color 0.2s ease;
  display: inline-block;
  line-height: 1;
  letter-spacing: 0.05em;
}

.logo-book:hover .ornament {
  transform: translateY(-1px) scale(1.04);
  color: var(--accent-terracotta);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  list-style: none;
  font-size: 0.95rem;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.nav-links li {
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
}

.nav-links a:not(.btn-editorial):not(.btn-outline):not(.admin-badge):not(.btn-settings) {
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  font-weight: 500;
  text-decoration: none !important;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:not(.btn-editorial):not(.btn-outline):not(.admin-badge):not(.btn-settings):hover,
.nav-links a:not(.btn-editorial):not(.btn-outline):not(.admin-badge):not(.btn-settings).active {
  color: var(--text-ink);
  border-bottom-color: var(--accent-earth);
}

.btn-settings {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle) !important;
  color: var(--text-secondary) !important;
  text-decoration: none !important;
  font-size: 1.05rem;
  line-height: 1;
  background-color: transparent;
  transition: all 0.15s ease;
  box-sizing: border-box;
}

.btn-settings:hover {
  background-color: var(--bg-card-subtle);
  color: var(--text-ink) !important;
  border-color: var(--accent-earth) !important;
}

.admin-badge {
  background-color: #8C3827;
  color: #FFF !important;
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
  line-height: 1.2;
  display: inline-flex;
  align-items: center;
  text-transform: uppercase;
}

/* Botones */
.btn-editorial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  background-color: var(--accent-earth);
  color: #FFF9F2 !important;
  padding: 0.4rem 0.95rem;
  border-radius: 4px;
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.2;
  border: 1px solid var(--accent-earth) !important;
  cursor: pointer;
  text-decoration: none !important;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.btn-editorial:hover {
  background-color: var(--accent-earth-hover);
  border-color: var(--accent-earth-hover) !important;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--accent-earth) !important;
  border: 1px solid var(--border-subtle) !important;
  padding: 0.35rem 0.8rem;
  border-radius: 4px;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none !important;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.btn-outline:hover {
  background-color: var(--bg-card-subtle);
  color: var(--text-ink) !important;
  border-color: var(--accent-earth) !important;
}

.btn-danger,
.btn-admin-danger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: #FBF0ED;
  color: #A44330 !important;
  border: 1px solid #E4BCB4 !important;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none !important;
  transition: all 0.15s ease;
  line-height: 1.4;
  vertical-align: middle;
}

.btn-danger:hover,
.btn-admin-danger:hover {
  background-color: #A44330;
  color: #FFFFFF !important;
  border-color: #A44330 !important;
}

/* Contenido Principal */
.main-content {
  flex: 1;
  max-width: 860px;
  width: 100%;
  margin: 2.2rem auto;
  padding: 0 1.5rem;
}

.book-intro {
  text-align: center;
  padding: 1.8rem 1rem 1.4rem;
  margin-bottom: 1.8rem;
}

.book-intro h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.book-intro p {
  color: var(--text-secondary);
  font-style: italic;
}

/* Buscador Integrado Editorial */
.search-box {
  margin: 1.4rem auto 0;
  max-width: 480px;
  display: flex;
  align-items: stretch;
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(70, 50, 30, 0.04);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-box:focus-within {
  border-color: var(--accent-earth);
  box-shadow: 0 2px 12px rgba(125, 86, 56, 0.12);
}

.search-box-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.65rem 1rem;
  font-family: var(--font-serif);
  font-size: 0.96rem;
  color: var(--text-ink);
  outline: none;
}

.search-box-input::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.search-box-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--bg-card-subtle);
  border: none;
  border-left: 1px solid var(--border-light);
  color: var(--accent-earth);
  padding: 0.65rem 1.25rem;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.search-box-btn:hover {
  background-color: var(--accent-earth);
  color: #FFF9F2 !important;
}

/* Pestañas Editoriales */
.tabs-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 2rem;
  padding-bottom: 0;
}

.tabs-nav {
  display: flex;
  gap: 1.8rem;
}

.tab-link {
  font-size: 1.05rem;
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--text-muted);
  padding-bottom: 0.7rem;
  margin-bottom: -1px;
  border-bottom: 2px solid transparent !important;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

.tab-link:hover {
  color: var(--text-ink);
  border-bottom-color: var(--border-accent) !important;
}

.tab-link.active {
  color: var(--text-ink);
  font-weight: 600;
  border-bottom: 2px solid var(--accent-earth) !important;
}

.tab-count {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background-color: var(--bg-card-subtle);
  padding: 0.08rem 0.45rem;
  border-radius: 10px;
  border: 1px solid var(--border-light);
}

.tab-link.active .tab-count {
  color: var(--accent-earth);
  border-color: var(--border-accent);
}

/* Tarjetas de Posts */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.post-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.8rem 2rem;
  box-shadow: 0 4px 12px rgba(70, 50, 30, 0.04);
  transition: transform 0.15s ease;
}

.post-card:hover {
  transform: translateY(0);
}

.post-card-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.post-meta-badge {
  background-color: var(--bg-card-subtle);
  color: var(--accent-earth);
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  border: 1px solid var(--border-light);
}

.post-title {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  line-height: 1.35;
  margin: 0.4rem 0 0.8rem;
}

.post-title a {
  color: var(--text-ink);
  border-bottom: none;
}

.post-title a:hover {
  color: var(--accent-terracotta);
}

.post-excerpt {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.2rem;
}

.post-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Vista Artículo */
.article-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 3rem 3.5rem;
  box-shadow: 0 6px 20px rgba(70, 50, 30, 0.05);
  margin-bottom: 3rem;
}

.article-header {
  text-align: center;
  margin-bottom: 2.2rem;
  padding-bottom: 1.8rem;
  border-bottom: 1px solid var(--border-light);
}

.article-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.15rem;
  line-height: 1.85;
}

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  margin: 2rem 0 1rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.3rem;
}

.article-body h3 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  margin: 1.6rem 0 0.8rem;
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--accent-earth);
  padding: 0.8rem 1.4rem;
  margin: 1.6rem 0;
  font-style: italic;
  background-color: var(--bg-card-subtle);
}

.article-body code:not(pre code) {
  font-family: var(--font-mono);
  background-color: var(--bg-code);
  font-size: 0.92em;
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--border-light);
}

/* ==============================================================================
   ASPECTO ESPECIAL DE TERMINAL PARA BASH / SHELL
   ============================================================================== */
.terminal-window {
  background-color: #1E1B18;
  /* Carbón oscuro cálido */
  border: 1px solid #3A342E;
  border-radius: 6px;
  margin: 2rem 0;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.terminal-bar {
  background-color: #2D2721;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #3A342E;
}

.terminal-dots {
  display: flex;
  gap: 0.45rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red {
  background-color: #E06C75;
}

.dot-yellow {
  background-color: #E5C07B;
}

.dot-green {
  background-color: #98C379;
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #C2B49F;
  letter-spacing: 0.05em;
}

.terminal-content {
  margin: 0 !important;
  padding: 1.2rem 1.4rem;
  background-color: #1E1B18 !important;
  color: #E7E0D3 !important;
  font-family: var(--font-mono) !important;
  font-size: 0.95rem;
  line-height: 1.65;
  overflow-x: auto;
}

/* Bloques estándar de otros lenguajes (Python, JS, etc.) */
.code-window {
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  margin: 2rem 0;
  overflow: hidden;
}

.code-bar {
  background-color: #ECE3D6;
  padding: 0.4rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.code-lang-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-earth);
  font-weight: 600;
}

.code-window pre {
  margin: 0;
  padding: 1.2rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.94rem;
  line-height: 1.6;
  overflow-x: auto;
}

.btn-copy-code {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 0.15rem 0.5rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-copy-code:hover {
  background-color: var(--bg-card);
  color: var(--text-ink);
}

/* Editor & Selector de Lenguajes */
.editor-toolbar {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  padding: 0.5rem;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  flex-wrap: wrap;
}

.toolbar-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.toolbar-btn:hover {
  background-color: var(--bg-parchment);
  border-color: var(--border-subtle);
}

.toolbar-select {
  padding: 0.25rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background-color: var(--bg-parchment);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  color: var(--accent-earth);
  cursor: pointer;
}

/* Formularios */
.form-group {
  margin-bottom: 1.4rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  background-color: var(--bg-parchment);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-ink);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-earth);
  background-color: #FFF;
}

.editor-textarea {
  min-height: 360px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

/* Comentarios */
#comentarios {
  scroll-margin-top: 40vh;
}

.comment-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.4rem 1.8rem;
  margin-bottom: 1.2rem;
}

.comment-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.comment-author {
  font-weight: 600;
  color: var(--text-ink);
}

.comment-content {
  font-size: 1.05rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

/* Footer */
.footer-book {
  border-top: 1px solid var(--border-light);
  padding: 2.2rem 0;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: auto;
}

.ornament-divider {
  text-align: center;
  color: var(--border-accent);
  margin: 1.5rem 0;
  user-select: none;
}

@media (max-width: 960px) {
  .nav-container {
    flex-direction: column;
    gap: 0.9rem;
    padding: 0 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 768px) {
  .article-container {
    padding: 1.8rem 1.2rem;
  }

  .article-title {
    font-size: 2rem;
  }
}

/* ==============================================================================
   TIMELINE - Vista principal de posts
   ============================================================================== */
.timeline {
  position: relative;
}

/* Card de la timeline */
.timeline-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.4rem 1.6rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(70, 50, 30, 0.04);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.timeline-card:hover {
  border-color: var(--border-accent);
  box-shadow: 0 4px 16px rgba(70, 50, 30, 0.08);
}

.timeline-card:last-child {
  margin-bottom: 0;
}

.timeline-card-time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-left: auto;
}

.timeline-card-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}

.timeline-card-stats {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.timeline-card-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.35;
  margin: 0.2rem 0 0.5rem;
}

.timeline-card-title a {
  color: var(--text-ink);
  border-bottom: none;
}

.timeline-card-title a:hover {
  color: var(--accent-terracotta);
}

.timeline-card-excerpt {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 0.8rem;
}

.timeline-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Responsive timeline */
@media (max-width: 768px) {
  .timeline-card {
    padding: 1.1rem 1.2rem;
  }

  .timeline-card-time {
    font-size: 0.8rem;
  }

  .timeline-card-title {
    font-size: 1.2rem;
  }

  .timeline-card-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* ==============================================================================
   SCROLL INFINITO - Centinela y Estados
   ============================================================================== */
.timeline-sentinel {
  padding: 2rem 0;
  text-align: center;
  min-height: 48px;
}

.timeline-status-msg {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-family: var(--font-body);
}

.timeline-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent-earth);
  border-radius: 50%;
  animation: timeline-spin 0.75s linear infinite;
  display: inline-block;
}

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