/* ============================================
   NEURAL NETWORK VISUALIZATION
   Seminario Complementario - Red Neuronal
   Incluye: canvas SVG animado + layer links
   ============================================ */

/* ── Canvas wrapper ─────────────────────────────────────── */
.nn-canvas-wrapper {
  position: relative;
  margin: var(--space-xl) 0 var(--space-2xl);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(255,107,53,0.1);
  background:
    radial-gradient(ellipse at 15% 40%, rgba(34,197,94,0.04) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 70%, rgba(0,240,255,0.03) 0%, transparent 45%),
    radial-gradient(ellipse at 85% 35%, rgba(244,63,94,0.04) 0%, transparent 45%),
    #0a0e18;
  box-shadow:
    0 0 0 1px rgba(255,107,53,0.06),
    0 20px 60px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.04);
}

.nn-canvas {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,107,53,0.2) transparent;
}
.nn-canvas::-webkit-scrollbar { height: 4px; }
.nn-canvas::-webkit-scrollbar-thumb { background: rgba(255,107,53,0.25); border-radius: 2px; }
.nn-canvas::-webkit-scrollbar-track { background: transparent; }

/* SVG node hover CSS states */
.nv-node--on { transition: all 0.2s; }
.nv-node--on:hover .nv-node-body {
  filter: drop-shadow(0 0 8px currentColor);
}
.nv-act { transition: all 0.2s; }
.nv-act:hover .nv-act-body {
  filter: drop-shadow(0 0 6px currentColor);
}

/* Cursor changes */
.nv-node--on,
.nv-act { cursor: pointer; }
.nv-node--off { cursor: default; opacity: 0.5; }

/* ── Layer links (access cards below the diagram) ───────── */
.nn-layer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.nn-layer-link {
  display: flex; align-items: center; gap: var(--space-md);
  background: var(--bg-warm-card, var(--bg-card));
  border: 1px solid rgba(255,107,53,0.08);
  border-radius: 14px;
  padding: var(--space-lg) var(--space-xl);
  text-decoration: none; color: inherit;
  transition: all 0.3s var(--ease-out);
  position: relative; overflow: hidden;
}

.nn-layer-link::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, #22c55e, #00f0ff, #f43f5e, #a855f7);
  opacity: 0; transition: opacity 0.3s;
}

.nn-layer-link:hover {
  border-color: rgba(255,107,53,0.22);
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.3), 0 0 30px rgba(255,107,53,0.06);
}
.nn-layer-link:hover::before { opacity: 1; }

.nn-ll-num {
  font-family: var(--font-display); font-size: 1.8rem; font-weight: 700;
  line-height: 1; color: var(--orange); opacity: 0.18;
  flex-shrink: 0; min-width: 2.2ch;
  transition: opacity 0.3s;
}
.nn-layer-link:hover .nn-ll-num { opacity: 0.7; }

.nn-ll-body {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: 3px;
}
.nn-ll-body strong {
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 700;
  color: var(--text-primary); letter-spacing: -0.01em;
}
.nn-ll-body span {
  font-family: var(--font-mono); font-size: 0.68rem;
  color: var(--text-muted); letter-spacing: 0.03em;
}

.nn-layer-link > svg {
  color: var(--orange); opacity: 0.3; flex-shrink: 0;
  transition: all 0.25s var(--ease-out);
}
.nn-layer-link:hover > svg { opacity: 1; transform: translateX(4px); }

/* ── Responsive layer links ─────────────────────────────── */
@media (max-width: 900px) {
  .nn-layer-links { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nn-layer-links { grid-template-columns: 1fr; }
  .nn-canvas-wrapper { border-radius: 12px; }
}



/* Color coding for node types */
:root {
    --nn-pedagogico: #22c55e;
    --nn-tecnico: #00f0ff;
    --nn-sociopolitico: #f43f5e;
    --nn-complementario: #a855f7;
    --nn-actividad-ac: #ff6b35;
    --nn-actividad-exp: #fbbf24;
    --nn-actividad-bp: #22c55e;
}

/* ============================================
   Neural Network Section - Main Page
   ============================================ */
.nn-section {
    padding: var(--space-3xl) 0;
    position: relative;
    overflow: hidden;
}

.nn-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(34, 197, 94, 0.03) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 60%, rgba(0, 240, 255, 0.02) 0%, transparent 40%),
        radial-gradient(ellipse at 80% 40%, rgba(244, 63, 94, 0.02) 0%, transparent 40%);
    pointer-events: none;
}

.nn-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

.nn-intro p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.75;
}

.nn-intro .nn-metaphor {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: 1rem;
    color: var(--text-primary);
    opacity: 0.7;
    margin-top: var(--space-md);
}

.nn-intro .nn-nav-hint {
    font-size: 0.88rem;
    color: var(--orange);
    opacity: 0.85;
    margin-top: var(--space-md);
    font-weight: 500;
}

/* Legend - compact horizontal */
.nn-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm) var(--space-lg);
    margin-bottom: var(--space-2xl);
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
}

.nn-legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.nn-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ============================================
   NEURAL MAP - Vertical Layer Cards
   ============================================ */
.nn-map {
    max-width: 780px;
    margin: 0 auto;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Layer card */
.nn-layer-card {
    width: 100%;
    background: var(--bg-warm-card, var(--bg-card));
    border: 1px solid rgba(255,107,53,0.08);
    border-radius: 18px;
    padding: var(--space-xl) var(--space-2xl);
    position: relative;
    transition: all 0.4s var(--ease-out);
    text-decoration: none;
    color: inherit;
    display: block;
    overflow: hidden;
}

.nn-layer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--nn-pedagogico), var(--nn-tecnico), var(--nn-sociopolitico));
    opacity: 0.3;
    transition: opacity 0.4s;
}

.nn-layer-card:hover {
    border-color: rgba(255,107,53,0.2);
    transform: translateY(-3px);
    box-shadow:
        0 12px 40px rgba(0,0,0,0.3),
        0 0 40px rgba(255,107,53,0.04);
}

.nn-layer-card:hover::before {
    opacity: 0.7;
}

/* Card header row */
.nn-layer-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
}

.nn-layer-card-num {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1;
    color: var(--orange);
    opacity: 0.12;
    flex-shrink: 0;
    min-width: 3ch;
    letter-spacing: -0.04em;
}

.nn-layer-card-header-text {
    flex: 1;
    min-width: 0;
}

.nn-layer-card-title {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 6px;
}

.nn-layer-card-weeks {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* Card description */
.nn-layer-card-desc {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

/* Path indicators (dots showing available routes) */
.nn-layer-card-paths {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.nn-path-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    padding: 4px 10px;
    border-radius: 100px;
    border: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.015);
    transition: all 0.3s;
}

.nn-layer-card:hover .nn-path-indicator {
    background: rgba(255,255,255,0.04);
}

.nn-path-indicator-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.nn-path-indicator.nn-path-disabled {
    opacity: 0.25;
}

/* Card CTA */
.nn-layer-card-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--orange);
    letter-spacing: 0.02em;
    transition: all 0.25s var(--ease-out);
}

.nn-layer-card:hover .nn-layer-card-cta {
    gap: 12px;
}

.nn-layer-card-cta svg {
    width: 16px;
    height: 16px;
    transition: transform 0.25s var(--ease-out);
}

.nn-layer-card:hover .nn-layer-card-cta svg {
    transform: translateX(3px);
}

/* ============================================
   SVG Connectors Between Cards
   ============================================ */
.nn-connector {
    width: 80px;
    height: 48px;
    flex-shrink: 0;
    overflow: visible;
}

.nn-connector-line {
    stroke: var(--orange);
    stroke-width: 1.5;
    fill: none;
    opacity: 0.15;
}

.nn-connector-pulse {
    stroke: var(--orange);
    stroke-width: 2;
    fill: none;
    opacity: 0;
    animation: nnConnectorPulse 3s ease-in-out infinite;
}

@keyframes nnConnectorPulse {
    0%   { opacity: 0; stroke-dashoffset: 60; }
    30%  { opacity: 0.4; }
    70%  { opacity: 0.4; }
    100% { opacity: 0; stroke-dashoffset: 0; }
}

.nn-connector-dot {
    fill: var(--orange);
    opacity: 0.2;
}

/* Branch indicators in connectors */
.nn-connector-branch {
    stroke-width: 1;
    fill: none;
    opacity: 0.1;
}

.nn-connector-branch.branch-tecnico {
    stroke: var(--nn-tecnico);
}

.nn-connector-branch.branch-sociopolitico {
    stroke: var(--nn-sociopolitico);
}

/* ============================================
   CAPA (Layer) Detail Pages
   ============================================ */
.page-capa {
    padding-top: 64px;
    background: var(--bg-warm, #0f0d0a);
    background-image:
        radial-gradient(ellipse at 10% 20%, rgba(255,107,53,0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 90% 80%, rgba(255,140,50,0.025) 0%, transparent 50%);
}

.capa-main {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
}

/* Breadcrumb */
.capa-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
}

.capa-breadcrumb a {
    color: var(--orange);
    text-decoration: none;
    transition: opacity 0.2s;
}

.capa-breadcrumb a:hover { opacity: 0.7; }
.capa-breadcrumb span { color: var(--text-muted); }

/* ============================================
   MINI-MAP - Horizontal navigation in capa pages
   ============================================ */
.capa-minimap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: var(--space-2xl);
    padding: var(--space-md) var(--space-lg);
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
}

.minimap-dot {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-subtle);
    background: rgba(255,255,255,0.02);
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
    position: relative;
    flex-shrink: 0;
}

.minimap-dot:hover {
    border-color: rgba(255,107,53,0.4);
    color: var(--text-primary);
    background: rgba(255,107,53,0.06);
    transform: scale(1.1);
}

.minimap-dot.active {
    border-color: var(--orange);
    color: var(--orange);
    background: rgba(255,107,53,0.1);
    box-shadow: 0 0 16px rgba(255,107,53,0.2);
}

.minimap-dot.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--orange);
    border-radius: 50%;
}

.minimap-line {
    width: 24px;
    height: 2px;
    background: rgba(255,255,255,0.06);
    flex-shrink: 0;
    position: relative;
}

.minimap-line::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--orange);
    opacity: 0;
    transition: opacity 0.3s;
}

.minimap-tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--text-primary);
    background: rgba(15,13,10,0.95);
    border: 1px solid var(--border-subtle);
    padding: 4px 10px;
    border-radius: 6px;
    pointer-events: none;
    letter-spacing: 0.04em;
}

.minimap-dot:hover .minimap-tooltip {
    display: block;
}

/* Capa hero */
.capa-hero {
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--border-subtle);
}

.capa-number {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    opacity: 0.06;
    line-height: 1;
    margin-bottom: -1rem;
}

.capa-title {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.capa-purpose {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 700px;
}

.capa-meta {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
}

.capa-meta-item {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
    padding: 0.3em 0.8em;
    background: rgba(255,107,53,0.06);
    border: 1px solid rgba(255,107,53,0.12);
    border-radius: 100px;
    letter-spacing: 0.04em;
}

/* Node sections */
.node-section {
    margin-bottom: var(--space-3xl);
    padding-top: var(--space-xl);
    scroll-margin-top: 80px;
}

.node-section-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.node-type-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
}

.node-type-badge {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.3em 1em;
    border-radius: 100px;
    border: 1px solid;
}

.node-badge-pedagogico {
    color: var(--nn-pedagogico);
    border-color: rgba(34,197,94,0.3);
    background: rgba(34,197,94,0.08);
}

.node-badge-tecnico {
    color: var(--nn-tecnico);
    border-color: rgba(0,240,255,0.3);
    background: rgba(0,240,255,0.08);
}

.node-badge-sociopolitico {
    color: var(--nn-sociopolitico);
    border-color: rgba(244,63,94,0.3);
    background: rgba(244,63,94,0.08);
}

.node-badge-complementario {
    color: var(--nn-complementario);
    border-color: rgba(168,85,247,0.3);
    background: rgba(168,85,247,0.08);
}

.node-section h2 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.node-section h2 small {
    font-weight: 400;
    font-size: 0.75em;
    color: var(--text-muted);
    display: block;
    margin-top: 4px;
}

.node-description {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: var(--space-xl);
    max-width: 700px;
}

/* Video grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 10px;
    border: 1px solid rgba(255,107,53,0.1);
    background: #000;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 10px;
}

.video-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    margin-top: 6px;
    text-align: center;
}

/* Reading content box */
.node-reading-box {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.node-reading-box h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.node-reading-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* Divider between node sections */
.node-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
    margin: var(--space-xl) 0;
}

/* Activity section */
.activity-section {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-subtle);
}

.activity-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.activity-card {
    background: var(--bg-warm-card, var(--bg-card));
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    padding: var(--space-xl);
    transition: all 0.4s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.activity-card-ac::before { background: var(--nn-actividad-ac); }
.activity-card-exp::before { background: var(--nn-actividad-exp); }
.activity-card-bp::before { background: var(--nn-actividad-bp); }

.activity-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    border-color: rgba(255,107,53,0.15);
}

.activity-card h3 {
    font-family: var(--font-display);
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.activity-card p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.activity-card .tag {
    margin-top: var(--space-md);
}

/* Navigation between layers */
.capa-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-subtle);
    margin-top: var(--space-2xl);
}

.capa-nav a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--orange);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    transition: all 0.25s var(--ease-out);
}

.capa-nav a:hover {
    opacity: 0.7;
}

.capa-nav-center {
    color: var(--text-muted) !important;
}

/* ============================================
   NAV STYLING FOR CAPA PAGES
   ============================================ */
.nav-main {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 var(--space-xl);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(15,13,10,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,107,53,0.08);
    transition: all 0.3s var(--ease-out);
}

.nav-main .nav-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-main .nav-logo {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--orange);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-main .nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-sm);
    flex-direction: column;
    gap: 5px;
}

.nav-main .nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all 0.2s;
}

.nav-main .nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}

.nav-main .nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color 0.2s;
}

.nav-main .nav-links a:hover { color: var(--text-primary); }
.nav-main .nav-links a.active { color: var(--orange); }

@media (max-width: 768px) {
    .nav-main { padding: 0 var(--space-md); }
    .nav-main .nav-toggle { display: flex; }
    .nav-main .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(15,13,10,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s var(--ease-out);
        pointer-events: none;
        border-bottom: 1px solid var(--border-subtle);
    }
    .nav-main .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
}

/* ============================================
   NODE JUMP NAV — Quick links to each nodo
   ============================================ */
.node-jump-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
    margin-bottom: var(--space-2xl);
    padding: var(--space-lg) 0;
}

.node-jump-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45em;
    padding: 0.5em 1.2em;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    text-decoration: none;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 100px;
    background: rgba(255,255,255,0.03);
    transition: all 0.3s ease;
}

.node-jump-btn:hover {
    color: var(--text-primary);
    border-color: var(--btn-color, var(--orange));
    background: color-mix(in srgb, var(--btn-color, var(--orange)) 8%, transparent);
    transform: translateY(-1px);
}

.node-jump-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--btn-color, var(--orange));
    opacity: 0.7;
    flex-shrink: 0;
}

.node-jump-btn:hover .node-jump-dot {
    opacity: 1;
}

/* ============================================
   VIDEO PLACEHOLDER — "Video en construcción"
   ============================================ */
.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    background: linear-gradient(145deg, rgba(10, 17, 40, 0.95), rgba(15, 25, 50, 0.85));
    border-radius: 10px;
}

.video-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 10px;
    background:
        radial-gradient(circle at 30% 40%, rgba(255,107,53,0.04) 0%, transparent 60%),
        radial-gradient(circle at 70% 60%, rgba(0,240,255,0.03) 0%, transparent 50%);
}

.video-placeholder-icon {
    width: 44px;
    height: 44px;
    color: var(--text-muted);
    opacity: 0.4;
    position: relative;
    z-index: 1;
}

.video-placeholder span {
    position: relative;
    z-index: 1;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
    .video-grid {
        grid-template-columns: 1fr;
    }

    .activity-options {
        grid-template-columns: 1fr;
    }

    .node-jump-nav {
        gap: 0.4rem;
    }

    .node-jump-btn {
        font-size: 0.65rem;
        padding: 0.45em 0.9em;
    }
}

@media (max-width: 600px) {
    .capa-main {
        padding: var(--space-xl) var(--space-md);
    }

    .nn-legend {
        gap: var(--space-sm) var(--space-md);
    }

    .nn-layer-card {
        padding: var(--space-lg);
    }

    .nn-layer-card-num {
        font-size: 2rem;
    }

    .nn-layer-card-paths {
        gap: var(--space-sm);
    }

    .minimap-dot {
        width: 30px;
        height: 30px;
        font-size: 0.7rem;
    }

    .minimap-line {
        width: 14px;
    }
}