/* --- Global Styles & Variables --- */
:root {
    --primary-blue: #3A4A9F;
    --primary-purple: #6D3B9B;
    --dark-text: #212121;
    --light-text: #FFFFFF;
    --gray-text: #676767;
    --background-light: #F8F9FA;
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Merriweather', serif;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    color: var(--dark-text);
    margin: 0;
    line-height: 1.6;
    background-color: var(--light-text);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 3rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.2rem); margin-bottom: 2rem; text-align: center; }
p { font-size: 1rem; color: var(--gray-text); }

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Header & Navigation --- */
.main-header {
    background-color: var(--light-text);
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

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

.logo img { height: 40px; }
.main-nav { display: none; }
.nav-links { list-style: none; margin: 0; padding: 0; display: flex; }
.nav-links li { margin-left: 30px; }

.nav-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 600;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 22px;
    position: relative;
    z-index: 1001;
}

.hamburger, .hamburger::before, .hamburger::after {
    content: '';
    display: block;
    background-color: var(--dark-text);
    height: 3px;
    width: 100%;
    border-radius: 3px;
    transition: all 0.3s ease-in-out;
    position: absolute;
}

.hamburger::before { top: -10px; }
.hamburger::after { bottom: -10px; }

.nav-open .hamburger { background-color: transparent; }
.nav-open .hamburger::before { transform: rotate(45deg) translate(7px, 7px); }
.nav-open .hamburger::after { transform: rotate(-45deg) translate(7px, -7px); }

/* --- Hero Section --- */
.hero {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--light-text);
    padding: 80px 0;
    text-align: center;
}

.hero .subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 1rem auto 2rem auto;
}

.cta-button, .cta-button-secondary {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s ease;
}

.cta-button {
    background-color: var(--light-text);
    color: var(--primary-blue);
}

.cta-button:hover { transform: translateY(-3px); }

/* --- Sections General Styling --- */
section { padding: clamp(60px, 8vw, 80px) 0; }
.about-us, .courses-list, .contact-section { background-color: var(--background-light); }
.differentiators, .call-to-action { background-color: white; }

/* --- About Us Section --- */
.about-content { display: flex; flex-direction: column; align-items: center; gap: 40px; }
.about-text { flex: 1; text-align: center; }
.about-image { flex: 1; width: 100%; }
.about-image img { border-radius: 8px; }

/* --- Differentiators Section --- */
.features-grid { display: grid; grid-template-columns: 1fr; gap: 30px; text-align: center; }
.feature-card .feature-icon { font-size: 3rem; color: var(--primary-blue); }
.feature-card h3 { margin: 1rem 0; }

/* --- Call to Action Section --- */
.call-to-action {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
    color: var(--light-text);
    text-align: center;
}
.call-to-action h2 { color: var(--light-text); }
.call-to-action p { color: rgba(255, 255, 255, 0.9); }
.cta-button-secondary { background: transparent; border: 2px solid var(--light-text); color: var(--light-text); }
.cta-button-secondary:hover { background-color: var(--light-text); color: var(--primary-purple); transform: translateY(-3px); }

/* --- Page Title (Cursos & Contacto) --- */
.page-title {
    background-color: var(--dark-text);
    color: var(--light-text);
    text-align: center;
    padding: clamp(40px, 6vw, 60px) 0;
}
.page-title h1 { font-size: clamp(2rem, 5vw, 2.8rem); }
.page-title p { color: rgba(255, 255, 255, 0.8); }

/* --- Courses List Section --- */
.courses-list h2 {
    text-align: left;
    border-bottom: 2px solid var(--primary-blue);
    padding-bottom: 10px;
    margin-bottom: 2rem;
}
.courses-grid { display: grid; grid-template-columns: 1fr; gap: 30px; margin-bottom: 3rem; }
.course-card {
    background-color: var(--light-text);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.course-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.12); }
.course-content { padding: 25px; }
.course-content h3 { margin-top: 0; }
.course-button { display: inline-block; margin-top: 1rem; text-decoration: none; color: var(--primary-blue); font-weight: 600; }

/* --- Contact Section --- */
.contact-wrapper { display: flex; flex-direction: column; gap: 40px; }
.contact-form-container { flex: 2; }
.contact-info { flex: 1; background-color: var(--light-text); padding: 30px; border-radius: 8px; }
.contact-form .form-group, .contact-form .form-group-tel { margin-bottom: 1.5rem; }
.contact-form label { display: block; margin-bottom: 5px; font-weight: 600; }
.contact-form input, .contact-form textarea, .contact-form select { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 5px; font-family: var(--font-primary); }
.form-group-tel .tel-input { display: flex; }
.tel-input select { flex: 0 0 120px; border-right: none; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.tel-input input { border-top-left-radius: 0; border-bottom-left-radius: 0; }
.contact-form button { width: 100%; border: none; cursor: pointer; padding: 15px 30px; border-radius: 5px; background-color: var(--primary-blue); color: var(--light-text); font-weight: 700; transition: background-color 0.3s ease; }
.contact-form button:hover { background-color: var(--primary-purple); }
.form-message { margin-top: 1rem; text-align: center; }
.form-message.success { color: green; }
.form-message.error { color: red; }

/* --- Footer --- */
.main-footer {
    background-color: var(--dark-text);
    color: var(--gray-text);
    text-align: center;
    padding: 30px 0;
}
.social-icons {
    margin-bottom: 1rem;
}
.social-icons a {
    color: var(--light-text);
    margin: 0 10px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
}

/* --- Responsive Tablet --- */
@media (min-width: 768px) {
    .main-nav { display: block; }
    .nav-toggle { display: none; }
    .about-content { flex-direction: row; text-align: left; }
    .features-grid { grid-template-columns: repeat(3, 1fr); }
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-wrapper { flex-direction: row; }
}

/* --- Responsive Desktop --- */
@media (min-width: 1024px) {
    .courses-grid { grid-template-columns: repeat(3, 1fr); }
    .nav-links.mobile-nav { display: none; } /* Hide mobile nav on desktop */
}

/* --- Mobile Navigation --- */
.main-nav.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(5px);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    z-index: 1000;
}

.main-nav.mobile-nav.nav-open {
    transform: translateX(0);
}

.main-nav.mobile-nav .nav-links {
    flex-direction: column;
    gap: 2rem;
}

.main-nav.mobile-nav .nav-links a {
    font-size: 1.5rem;
}