/* Estilos Principales - Tu Ayuda Memoria Web */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --code-bg: #0f172a;
    --code-color: #38bdf8;
    --accent-color: #10b981;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    padding-bottom: 40px;
}

/* Header & Navegación */
header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    padding: 20px 15px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

header h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.nav-menu {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.nav-btn {
    background-color: #e0e7ff;
    color: var(--primary-color);
    border: none;
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background-color: #c7d2fe;
}

.nav-btn.active {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 6px rgba(79, 70, 229, 0.3);
}

/* Contenedor Principal */
.contenedor {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* Secciones SPA */
.seccion-contenido {
    display: none;
}

.seccion-contenido.active {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.seccion-contenido h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #0f172a;
    border-left: 4px solid var(--primary-color);
    padding-left: 10px;
}

/* Grid de Tarjetas */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

/* Tarjeta individual */
.tarjeta {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.03);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tarjeta:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.08);
}

.tarjeta h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 8px;
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 5px;
}

.explicacion {
    font-size: 0.9rem;
    color: #475569;
    margin-bottom: 12px;
    min-height: 40px;
}

/* Bloque de Código */
.codigo-box {
    background-color: var(--code-bg);
    border-radius: 8px;
    padding: 10px 12px;
    margin-bottom: 12px;
    overflow-x: auto;
}

.codigo-box pre {
    margin: 0;
}

.codigo-box code {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--code-color);
    white-space: pre-wrap;
    word-break: break-all;
}

/* Caja de Demostración */
.demo-box {
    background-color: #f1f5f9;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 10px;
    font-size: 0.85rem;
}

.demo-box small {
    display: block;
    font-weight: 700;
    color: #64748b;
    margin-bottom: 5px;
    text-transform: uppercase;
    font-size: 0.7rem;
}

.demo-render {
    background: #ffffff;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
}

/* Botones interactivos dentro de demos */
.demo-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 5px 10px;
    font-size: 0.8rem;
    border-radius: 4px;
    cursor: pointer;
}

.demo-btn:hover {
    background-color: var(--primary-hover);
}

.demo-btn-transition {
    background-color: #0284c7;
    color: white;
    border: none;
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.4s ease;
}

.demo-btn-transition:hover {
    background-color: #0369a1;
    transform: scale(1.05);
}

/* Clases auxiliares para demostraciones JS */
.clase-demo-activa {
    background-color: #fef08a !important;
    color: #854d0e !important;
    font-weight: bold;
    padding: 4px;
    border-radius: 4px;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    background-color: #ffffff;
}