.outline-layout {
    display: grid;
    grid-template-columns: 260px 1fr 1fr;
    gap: 20px;
    align-items: flex-start;
}

#main-lesson-container {
    grid-column: span 2;  
    display: grid;
    grid-template-columns: 2fr 1fr; 
    gap: 20px; 
    align-items: flex-start;
}

.lesson-theory {
    background: rgba(17,24,39,0.92); 
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 12px 34px var(--shadow);
    animation: fadeUp 0.8s ease forwards; 
}

.lesson-theory h2 {
    margin: 0 0 10px;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    color: var(--accent);
}

.lesson-theory p {
    margin: 8px 0;
    color: #d1d5db;
}

.lesson-theory strong {
    color: #ffffff;
}

/* Código dentro de teoría */
.lesson-theory pre {
    background: rgba(255, 255, 255, 0.05);
    padding: 10px;
    border-radius: 8px;
    margin: 12px 0;
    overflow-x: auto;
    color: #93c5fd;
    font-family: Consolas, monospace;
}

/* === Contenido del Ejemplo === */
.lesson-example {
    background: rgba(17,24,39,0.92); 
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px; 
    box-shadow: 0 12px 34px var(--shadow);
    display: flex;
    flex-direction: column; 
    justify-content: center;
    align-items: center;
    min-height: 250px; 
    animation: fadeUp 0.8s ease forwards; 
}

/* Estilos para los demos dentro de lesson-example */
.lesson-example .demo-box {
    width: 100%;
    height: 180px; 
    border-radius: 10px;
    border: 1px solid var(--border);
    box-shadow: 0 6px 18px rgba(0,0,0,0.4);
}

/* === Menú lateral === */
.side-menu {
    background: rgba(17, 24, 39, 0.9);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 10px 25px var(--shadow);
    height: fit-content;
    position: sticky;
    top: 24px;
    animation: fadeUp 0.8s ease forwards; 
}

.side-menu h3 {
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--accent);
    text-align: center;
    font-size: 1.15rem;
    font-weight: 700;
}

.lesson-list {
    list-style: none; 
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lesson-list li {
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    cursor: pointer;
    transition: all 0.25s ease;
    font-weight: 500;
    color: var(--text);
    border: 1px solid rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    gap: 8px; 
}

.lesson-list li:hover {
    background: rgba(56,189,248,0.15);
    border-color: var(--accent);
}

.lesson-list li.active {
    background: rgba(56,189,248,0.25);
    color: #dbeafe;
    border-color: var(--accent);
    font-weight: 600;
}

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


/* Demo box para outline */
#outline-demo-box {
  border: 4px solid #4ecdc4;      
  outline: 6px solid #ff6b6b;     
  outline-offset: 8px;         
  background: rgba(255, 255, 255, 0.06);
  width: 100%;
  height: 180px;                 
  border-radius: 12px;            
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}

/* Botón accesible demo */
.btn-accesible-demo {
    padding: 12px 24px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    margin: 15px 0;
}

.btn-accesible-demo:focus {
    outline: 3px solid #0056b3;
    outline-offset: 2px;
}

.btn-accesible-demo:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

/* Grid de características */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 25px 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.feature-card h4 {
    margin: 0 0 10px 0;
    color: var(--accent);
    font-size: 1.1rem;
}

.feature-card p {
    margin: 0;
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Casos de uso */
.usage-cases {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 20px 0;
}

.usage-case {
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--accent);
}

.usage-case h5 {
    margin: 0 0 10px 0;
    color: var(--accent);
    font-size: 1rem;
}

.usage-case p {
    margin: 0 0 15px 0;
    color: var(--text);
    font-size: 0.9rem;
}

/* Consideraciones */
.considerations {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 20px 0;
}

.consideration-card {
    padding: 20px;
    border-radius: 10px;
    border: 1px solid;
}

.consideration-card.warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: rgba(255, 193, 7, 0.3);
}

.consideration-card.tip {
    background: rgba(56, 189, 248, 0.1);
    border-color: rgba(56, 189, 248, 0.3);
}

.consideration-card.info {
    background: rgba(76, 175, 80, 0.1);
    border-color: rgba(76, 175, 80, 0.3);
}

.consideration-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.consideration-icon {
    font-size: 1.3rem;
}

.consideration-header h5 {
    margin: 0;
    color: var(--text);
    font-size: 1.1rem;
}

.consideration-card p {
    margin: 0;
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Resumen de lección */
.lesson-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 25px 0;
}

.summary-point {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.summary-number {
    background: var(--accent);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.summary-content h5 {
    margin: 0 0 8px 0;
    color: var(--accent);
    font-size: 1rem;
}

.summary-content p {
    margin: 0;
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* Pseudoclases CSS */
.css-pseudo {
    color: #c586c0; /* Morado para pseudoclases */
}

/* === estilos - estructura === */

.lesson-content {
    grid-column: 1 / -1; 
}

.theory-block {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.theory-block:last-of-type {
    border-bottom: none;
}

.example-block {
    background: rgba(56, 189, 248, 0.05);
    border-radius: 12px;
    padding: 20px;
    margin: 25px 0;
    border-left: 4px solid var(--accent);
}

/* Demo de comparación */
.demo-comparison {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 50px;
    margin: 40px 0;
}

.demo-item {
    text-align: center;
    flex: 1;
}

.demo-item p {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--muted);
}

/* === sintax higth === */

.css-comment {
    color: #6a9955; /* Verde para comentarios */
    font-style: italic;
}

.css-selector {
    color: #d7ba7d; /* Amarillo dorado para selectores */
}

.css-property {
    color: #9cdcfe; /* Azul claro para propiedades */
}

.css-value {
    color: #ce9178; /* Naranja para valores como 'bold', 'none' */
}

.css-function {
    color: #dcdcaa; /* Amarillo para funciones */
}

.css-number {
    color: #b5cea8; /* Verde claro para números */
}

/* Panel de código mejorado */
.code-panel {
    background: #1e1e1e;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.6);
    border: 1px solid #444;
}

.code-header {
    background: #2d2d2d;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #444;
    font-family: var(--sans);
}

.code-filename {
    color: #cccccc;
    font-weight: 600;
    font-size: 0.9rem;
}

.code-language {
    color: var(--accent);
    font-size: 0.8rem;
    background: rgba(56, 189, 248, 0.2);
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.code-content {
    padding: 25px;
    margin: 0;
    background: #1e1e1e;
    color: #d4d4d4;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
}

.code-content code {
    background: none;
    padding: 0;
    font-family: inherit;
}

/* === estilos - paso a psso === */

.step-by-step-enhanced {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin: 30px 0;
    position: relative;
}

/* Tarjetas de paso */
.step-card {
    background: rgba(17, 24, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 0;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(56, 189, 248, 0.3);
}

/* Header de cada paso */
.step-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 25px;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.step-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.step-number {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.4);
}

.step-title {
    flex: 1;
}

.step-title h4 {
    margin: 0 0 5px 0;
    color: var(--accent);
    font-size: 1.2rem;
}

/* Contenido del paso */
.step-content {
    padding: 25px;
}

.step-explanation p {
    margin: 0 0 15px 0;
    color: var(--text);
    line-height: 1.6;
}

/* === responsive === */

@media (max-width: 1200px) {
    .outline-layout {
        grid-template-columns: 260px 1fr; 
    }
    #main-lesson-container {
        grid-column: span 1;
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .lesson-example {
        min-height: 150px;
    }
}

@media (max-width: 1100px) {
    .outline-layout {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .lesson-summary {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .outline-layout {
        grid-template-columns: 1fr;
    }
    
    .side-menu {
        position: relative;
        top: 0;
        width: 100%;
    }
    
    #main-lesson-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .features-grid {
        gap: 15px;
    }
    
    .feature-card {
        padding: 15px;
    }
    
    .usage-case {
        padding: 15px;
    }
    
    .consideration-card {
        padding: 15px;
    }
    
    .summary-point {
        padding: 15px;
    }
    
    .demo-comparison {
        flex-direction: column;
        gap: 15px;
    }
}

/* === SECCION 2  ===*/

/* Variant para demos de la sección 2 */
.demo-box {
  border-radius: 14px;
}

.demo-comparison .demo-item p {
  margin-top: 10px;
  color: var(--muted);
}

.syntax-demo, .real-code-example { margin-top: 16px; }


/* === SECCION 3 === */

.example-block .demo-box { border-radius: 12px; }
.example-block .demo-item p { margin-top: 10px; }
.syntax-demo, .real-code-example { margin-top: 12px; }


/* === SECCION 4 === */

#offlab-preview { transition: outline-width .15s ease, outline-offset .15s ease, border-radius .15s ease; }
.example-block > h4 { margin: 0 0 12px; }


/* Botones de los labs accesibles */
.focus-ring:focus,
.focus-ring:focus-visible {
  outline: 3px solid #59e0d6;
  outline-offset: 4px;
  border-radius: 8px;
}

/* Solo teclado: click no muestra, teclado sí (focus-visible) */
.kbd-ring:focus { outline: none; }
.kbd-ring:focus-visible {
  outline: 3px solid #ff7b86;
  outline-offset: 4px;
  border-radius: 8px;
}

/* Para “default” quitamos cualquier override explícito */
.focus-none:focus,
.focus-none:focus-visible {
  outline: revert;           
  outline-offset: revert;
  box-shadow: none;
}

/* Estética del botón activo del lab */
.lab-mode-btn {
  transition: transform .12s ease, box-shadow .12s ease;
}
.lab-mode-btn.active {
  box-shadow: 0 0 0 3px rgba(89,224,214,.25);
  transform: translateY(-2px);
}

.practice-container {
  margin-top: 10px;
}

.practice-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 18px;
}

.practice-panel {
  background: rgba(17,24,39,0.92);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  box-shadow: 0 12px 34px rgba(0,0,0,.45);
  overflow: hidden;
}

.practice-panel .code-header,
.practice-panel .preview-header {
  display:flex; align-items:center; justify-content:space-between;
  padding: 12px 16px;
  background: rgba(255,255,255,.04);
  border-bottom: 1px solid rgba(255,255,255,.10);
}

.btn-reset {
  display: inline-flex; gap:8px; align-items:center;
  padding: 8px 12px;
  background: rgba(56,189,248,.18);
  border: 1px solid rgba(56,189,248,.35);
  color: #dbeafe;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .2s ease;
}
.btn-reset:hover { transform: translateY(-1px); box-shadow: 0 0 0 3px rgba(56,189,248,.18); }

.css-editor {
  width: 100%;
  min-height: 220px;
  background: #0b1220;
  color: #e5e7eb;
  border: none;
  padding: 14px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: .95rem;
  outline: none;
  resize: vertical;
  border-top: 1px solid rgba(255,255,255,.06);
}

.editor-actions {
  display:flex; align-items:center; gap:12px;
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
}

.btn-play {
  display:inline-flex; align-items:center; gap:8px;
  padding: 10px 14px;
  background: linear-gradient(135deg, #22d3ee, #60a5fa);
  color:#0b1220; font-weight:700;
  border: none; border-radius: 10px;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn-play:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(96,165,250,.35); }

.hint-box {
  display:flex; align-items:center; gap:8px; color: var(--muted);
  font-size: .9rem;
}

.preview-content {
  padding: 14px;
}

.preview-container {
  width: 100%;
  height: 240px;              
  background: radial-gradient(1200px 600px at 0% 0%, rgba(30,64,175,.18), rgba(2,6,23,.0)), rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  display:flex; align-items:center; justify-content:center;
  position: relative;
  overflow:hidden;
}

.preview-info {
  display:flex; gap:16px; padding: 10px 14px; color: var(--muted);
  border-top: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}

.preview-info .info-label { color:#93c5fd; }

/* El elemento que el usuario estiliza */
.preview-container .mi-outline {
  width: clamp(160px, 70%, 780px);
  height: clamp(60px, 46%, 160px);
  background: rgba(255,255,255,0.06);
  border-radius: 12px;
  
  border: 2px solid #59e0d6;
  outline: 8px solid #ff7b86;
  outline-offset: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
  transition: outline-width .15s ease, outline-offset .15s ease, border-radius .15s ease;
}

/* Estado de foco dentro de la vista previa para teclado */
.preview-container .mi-outline:focus-visible {
  outline: 3px solid #22d3ee;
  outline-offset: 6px;
}

/* Responsive de la grid de práctica */
@media (max-width: 1000px){
  .practice-grid { grid-template-columns: 1fr; }
  .preview-container { height: 220px; }
}