/* ---
   Hoja de Estilos para la Página Principal de "ElGuruJk"
   Autor: Gemini para Juank (ElGuruJk)
   Descripción: Estilos modernos con barra de navegación fija.
--- */

/* ======== VARIABLES Y CONFIGURACIÓN GENERAL ======== */
:root {
    --color-bg: #121212;
    --color-surface: #1e1e1e;
    --color-primary: #BB86FC;
    --color-secondary: #03DAC6;
    --color-text: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-border: #333;
    --nav-height: 80px; /* Definimos la altura de la barra de navegación */
}

body.light-mode {
    --color-bg: #f4f4f9;
    --color-surface: #ffffff;
    --color-primary: #6200EE;
    --color-secondary: #018786;
    --color-text: #212121;
    --color-text-secondary: #5f5f5f;
    --color-border: #ddd;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { 
    font-family: 'Poppins', sans-serif; 
    background-color: var(--color-bg); 
    color: var(--color-text); 
    line-height: 1.7; 
    transition: background-color 0.3s, color 0.3s;
    padding-top: var(--nav-height); /* AÑADIDO: Espacio para la barra de navegación fija */
}
.container { max-width: 1200px; margin: 0 auto; padding: 4rem 2rem; }
h1, h2, h3, h4 { font-weight: 600; margin-bottom: 1rem; color: var(--color-text); }
h1 { font-size: 3rem; text-align: center; }
h2 { font-size: 2.2rem; border-bottom: 3px solid var(--color-primary); padding-bottom: 0.5rem; display: inline-block; }
h3 { font-size: 1.5rem; color: var(--color-primary); margin-bottom: 0.5rem;}
.section-intro { max-width: 800px; margin: 1rem auto 3rem auto; text-align: center; font-size: 1.1rem; color: var(--color-text-secondary); }
i.fas { margin-right: 0.75rem; color: var(--color-secondary); }

/* ======== NAVEGACIÓN FIJA ======== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--color-surface);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    height: var(--nav-height);
    transition: background-color 0.3s;
}

.logo { font-size: 1.5rem; font-weight: 700; }
.theme-switcher { display: flex; align-items: center; gap: 0.5rem; }
.switch { position: relative; display: inline-block; width: 60px; height: 34px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; }
.slider:before { position: absolute; content: ""; height: 26px; width: 26px; left: 4px; bottom: 4px; background-color: white; transition: .4s; }
input:checked + .slider { background-color: var(--color-primary); }
input:checked + .slider:before { transform: translateX(26px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

/* ======== HEADER Y PORTADA (HERO) ======== */
.hero { 
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?q=80&w=2070&auto=format&fit=crop'); 
    background-size: cover; 
    background-position: center; 
    /* MODIFICADO: La altura se ajusta con calc() para restar la altura de la barra de navegación */
    height: calc(80vh - var(--nav-height)); 
    display: flex; 
    flex-direction: column; 
    text-align: center; 
    color: #fff; 
}
.hero-content { flex-grow: 1; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 0 2rem; }
.hero .subtitle { font-size: 1.5rem; font-weight: 300; margin-bottom: 2rem; max-width: 700px; }
.cta-button { display: inline-block; padding: 1rem 2.5rem; border-radius: 50px; text-decoration: none; font-weight: 600; transition: transform 0.3s, background-color 0.3s; cursor: pointer; border: 2px solid var(--color-primary); background-color: var(--color-primary); color: #fff; }
.cta-button:hover { transform: translateY(-5px); }

/* El resto de los estilos (.card-container, #footer, etc.) permanecen igual */
.card-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.course-card { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: 15px; padding: 2rem; text-decoration: none; color: var(--color-text); transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease; }
.course-card:hover { transform: translateY(-10px); border-color: var(--color-primary); box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2); }
.card-icon { font-size: 3rem; color: var(--color-secondary); margin-bottom: 1.5rem; }
.card-icon i { margin-right: 0; }
.course-card p { color: var(--color-text-secondary); font-size: 1rem; line-height: 1.6; }
#footer { background-color: var(--color-surface); text-align: center; padding: 3rem 2rem; margin-top: 3rem; border-top: 1px solid var(--color-border); }
#footer h3 { font-size: 1.8rem; color: var(--color-primary); }
#footer p { color: var(--color-text-secondary); max-width: 500px; margin: 0.5rem auto; }
#footer .copyright { margin-top: 2rem; font-size: 0.9rem; }
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero { height: auto; padding-bottom: 4rem; }
    .card-container { grid-template-columns: 1fr; }
}