/* --- 1. VARIABLES Y ESTILOS GLOBALES --- */
:root {
    --bg-dark: #121828;
    --bg-light: #1b2235;
    --primary-accent: #00f5c9;
    --secondary-accent: #8b5cf6;
    --text-light: #e2e8f0;
    --text-dark: #94a3b8;
    --font-family: 'Poppins', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-light);
}

/* --- 2. HEADER Y NAVEGACIÓN --- */
header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

/* Efecto Glassmorphism */
header.scrolled {
    background-color: rgba(27, 34, 53, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    height: 45px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

nav a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    padding-bottom: 5px;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-accent);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* --- 3. SECCIÓN HERO --- */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(18, 24, 40, 0.8), rgba(18, 24, 40, 0.8)), url('./static/images/hero-background.jpg') no-repeat center center/cover;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight-text {
    background: linear-gradient(90deg, var(--primary-accent), var(--secondary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 40px auto;
    color: var(--text-dark);
}

.cta-button {
    background: linear-gradient(90deg, var(--primary-accent), #00d4ff);
    color: var(--bg-dark);
    padding: 15px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: inline-block;
}

.cta-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 245, 201, 0.2);
}

.cta-button i {
    margin-left: 10px;
}

/* --- 4. SECCIÓN CURSOS --- */
.courses-section {
    padding: 100px 0;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.course-card {
    background-color: var(--bg-light);
    border-radius: 15px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.3);
}

.course-image-container img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.course-content {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-content h3 {
    font-size: 1.4rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.course-content p {
    color: var(--text-dark);
    flex-grow: 1;
    margin-bottom: 20px;
}

.course-button {
    color: var(--primary-accent);
    text-decoration: none;
    font-weight: 600;
    align-self: flex-start;
}

.course-button:hover {
    text-decoration: underline;
}

/* --- 5. SECCIÓN POR QUÉ ELEGIRNOS --- */
.why-us {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 40px 20px;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-accent);
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-light);
}

.feature-item p {
    color: var(--text-dark);
}


/* --- 6. FOOTER --- */
footer {
    padding: 40px 0;
    background-color: var(--bg-light);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.social-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.social-links a {
    color: var(--text-dark);
    font-size: 1.5rem;
    transition: color 0.3s ease, transform 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-accent);
    transform: scale(1.2);
}

/* --- 7. RESPONSIVE DESIGN --- */
@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    nav ul {
        display: none; /* En un proyecto real, aquí implementarías un menú hamburguesa */
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}