:root {
  --bg-main: #050E1F;
  --bg-sidebar: #071329;
  --bg-card: #0B172A;
  --bg-card-alt: #0F1F38;
  --bg-code: #040914;
  --border: #1E293B;
  --border-accent: rgba(6, 182, 212, 0.35);
  --cyan: #06B6D4;
  --blue: #3B82F6;
  --purple: #8B5CF6;
  --amber: #F59E0B;
  --green: #10B981;
  --red: #EF4444;
  --text-main: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.65;
  color-scheme: dark;
}

/* Layout Grid: Sidebar + Main Content */
.manual-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 100vh;
}

@media (max-width: 1024px) {
  .manual-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: relative !important;
    height: auto !important;
    width: 100% !important;
    border-right: none !important;
    border-bottom: 1px solid var(--border);
  }
}

/* Sidebar Navigation */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #050E1F;
  font-weight: 800;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px rgba(6, 182, 212, 0.35);
  flex-shrink: 0;
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.brand-sub {
  font-size: 11.5px;
  color: var(--cyan);
  font-weight: 600;
}

.search-box input {
  width: 100%;
  background: #040B18;
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 12.5px;
  outline: none;
}

.search-box input:focus {
  border-color: var(--cyan);
}

.nav-section-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 10px 0 6px 8px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.toc-list a {
  display: block;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.15s ease;
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  background: rgba(6, 182, 212, 0.08);
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* Main Content Area */
.content-area {
  padding: 38px 48px 80px 48px;
  max-width: 1140px;
  width: 100%;
}

@media (max-width: 768px) {
  .content-area {
    padding: 22px 18px 50px 18px;
  }
}

/* Hero Banner */
.hero-banner {
  background: linear-gradient(135deg, #091936 0%, #0B172A 100%);
  border: 1px solid var(--border-accent);
  border-radius: 14px;
  padding: 28px 32px;
  margin-bottom: 36px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.hero-badge {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(6, 182, 212, 0.15);
  color: var(--cyan);
  border: 1px solid var(--border-accent);
  margin-bottom: 10px;
}

.hero-banner h1 {
  margin: 0 0 10px 0;
  font-size: 28px;
  letter-spacing: -0.02em;
}

.hero-banner p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 880px;
}

.hero-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 20px;
}

@media (max-width: 800px) {
  .hero-meta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.meta-item {
  background: rgba(5, 14, 31, 0.65);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}

.meta-item span {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.meta-item strong {
  font-size: 13.5px;
  color: var(--text-main);
  font-family: var(--font-mono);
}

/* Chapter Sections */
.chapter {
  margin-bottom: 52px;
  scroll-margin-top: 24px;
}

.chapter-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 22px;
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.chapter-header h2 {
  margin: 4px 0 0 0;
  font-size: 23px;
  color: var(--text-main);
}

h3 {
  font-size: 17px;
  color: var(--cyan);
  margin: 26px 0 10px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

h4 {
  font-size: 14.5px;
  color: var(--text-main);
  margin: 18px 0 8px 0;
}

p {
  color: var(--text-secondary);
  margin: 0 0 14px 0;
  font-size: 14.5px;
}

ul, ol {
  color: var(--text-secondary);
  font-size: 14.5px;
  padding-left: 22px;
  margin: 0 0 16px 0;
}

li {
  margin-bottom: 7px;
}

li strong {
  color: var(--text-main);
}

code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--bg-code);
  color: #6EE7B7;
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: #E2E8F0;
  margin: 14px 0 20px 0;
}

/* Technical Deep-Dive Grid */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 18px 0 22px 0;
}

@media (max-width: 900px) {
  .tech-grid {
    grid-template-columns: 1fr;
  }
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  border-top: 3px solid var(--cyan);
}

.info-card.impact {
  border-top-color: var(--amber);
}

.info-card.services {
  border-top-color: var(--purple);
}

.info-card.usage {
  border-top-color: var(--green);
}

.info-card-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-card.impact .info-card-title { color: #FCD34D; }
.info-card.services .info-card-title { color: #C4B5FD; }
.info-card.usage .info-card-title { color: #6EE7B7; }

.info-card p, .info-card ul {
  font-size: 13.5px;
  margin-bottom: 0;
}

/* Callout Boxes */
.callout {
  background: var(--bg-card);
  border-left: 4px solid var(--cyan);
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 0 10px 10px 0;
  padding: 15px 18px;
  margin: 18px 0;
}

.callout-warn {
  border-left-color: var(--amber);
  background: rgba(245, 158, 11, 0.06);
}

.callout-danger {
  border-left-color: var(--red);
  background: rgba(239, 68, 68, 0.06);
}

.callout-success {
  border-left-color: var(--green);
  background: rgba(16, 185, 129, 0.06);
}

.callout-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-main);
  margin-bottom: 5px;
}

/* Screenshots Figure */
.screenshot-box {
  margin: 22px 0 28px 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}

.screenshot-box img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid var(--border);
}

.screenshot-caption {
  padding: 11px 16px;
  font-size: 12.5px;
  color: var(--text-muted);
  background: #071122;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

/* Tables */
.table-container {
  overflow-x: auto;
  margin: 16px 0 24px 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
}

.manual-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.manual-table th {
  text-align: left;
  padding: 11px 14px;
  background: #081326;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
}

.manual-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(30, 41, 59, 0.7);
  color: var(--text-secondary);
  vertical-align: top;
}

.manual-table tr:last-child td {
  border-bottom: none;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}
.b-crit { background: rgba(239, 68, 68, 0.18); color: #FCA5A5; border: 1px solid rgba(239, 68, 68, 0.35); }
.b-warn { background: rgba(245, 158, 11, 0.18); color: #FCD34D; border: 1px solid rgba(245, 158, 11, 0.35); }
.b-ok   { background: rgba(16, 185, 129, 0.18); color: #6EE7B7; border: 1px solid rgba(16, 185, 129, 0.35); }
.b-info { background: rgba(6, 182, 212, 0.18); color: var(--cyan); border: 1px solid rgba(6, 182, 212, 0.35); }

/* Playbook Cards */
.playbook-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 18px;
}

.playbook-card h4 {
  margin: 0 0 10px 0;
  color: var(--cyan);
  font-size: 16px;
}

/* Footer */
.manual-footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 10px;
}

/* Teclas */
kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--mono, monospace);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--text-main);
  background: #0d1b30;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  white-space: nowrap;
}

@media print {
  .sidebar { display: none !important; }
  .manual-layout { grid-template-columns: 1fr; }
  body { background: #fff; color: #000; }
}