/* Variables para un fácil cambio de tema */
:root {
    --bg-color: #2E3436; /* Un gris muy oscuro, casi negro */
    --bg-darker: #212529; /* Un poco más oscuro para secciones alternas */
    --text-color: #ECEFF4; /* Blanco grisáceo para texto principal */
    --secondary-text-color: #B4BFCD; /* Gris claro para texto secundario */
    --accent-color: #4C99ED; /* Azul vibrante (como en GNOME) */
    --accent-darker: #3C7ED0; /* Azul un poco más oscuro */
    --border-color: #444C54; /* Gris para bordes sutiles */
    --focus-color: #66CCFF; /* Azul claro para elementos enfocados */
    --font-family: 'Inter', 'Roboto', sans-serif;
    --border-radius: 6px;
    --spacing-unit: 1rem;
}

/* Reset básico y box-sizing */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden; /* Previene el scroll horizontal */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    font-weight: 600; /* Semi-bold */
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.6rem; }

p {
    margin-bottom: var(--spacing-unit);
    color: var(--secondary-text-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--focus-color);
}

/* Navbar */
.navbar {
    background-color: var(--bg-darker);
    padding: calc(var(--spacing-unit) * 0.8) 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.navbar .logo {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-color);
}

.navbar ul {
    list-style: none;
    display: flex;
}

.navbar ul li {
    margin-left: calc(var(--spacing-unit) * 1.5);
}

.navbar ul li a {
    color: var(--secondary-text-color);
    font-weight: 400;
    padding: 0.5rem 0;
    position: relative;
}

.navbar ul li a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -5px;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

.navbar ul li a:hover::after,
.navbar ul li a.active::after {
    width: 100%;
}

.navbar ul li a:hover {
    color: var(--accent-color);
}

/* Botones */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
    margin-right: calc(var(--spacing-unit) * 0.8);
    margin-top: var(--spacing-unit);
    cursor: pointer;
    border: none;
}

.primary-btn {
    background-color: var(--accent-color);
    color: var(--text-color);
}

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

.secondary-btn {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.secondary-btn:hover {
    background-color: rgba(var(--accent-color-rgb), 0.1); /* Asumiendo que definas --accent-color-rgb como 76,153,237 */
    border-color: var(--focus-color);
    color: var(--focus-color);
}

/* Secciones generales */
.section-padding {
    padding: calc(var(--spacing-unit) * 4) 0;
}

.section-header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.section-header .underline {
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    margin: 0.5rem auto 0 auto;
    border-radius: 2px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--bg-color), var(--bg-darker));
    padding: calc(var(--spacing-unit) * 6) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    text-align: left;
}

.hero-section .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap; /* Para responsive */
}

.hero-content {
    flex: 1;
    min-width: 300px;
    margin-right: calc(var(--spacing-unit) * 2);
}

.hero-content .greeting {
    font-size: 1.2rem;
    color: var(--accent-color);
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.hero-content h2 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-text-color);
}

.hero-content h1 {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    color: var(--text-color);
}

.hero-content .tagline {
    font-size: 1.3rem;
    color: var(--secondary-text-color);
    max-width: 600px;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.hero-image {
    flex: 1;
    min-width: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-left: calc(var(--spacing-unit) * 2);
}

.placeholder-img {
    width: 280px;
    height: 280px;
    background-color: var(--bg-darker);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.icon-code {
    width: 120px;
    height: 120px;
    color: var(--accent-color);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: calc(var(--spacing-unit) * 3);
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
}

.about-card {
    background-color: var(--bg-darker);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.about-card h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-unit);
    display: flex;
    align-items: center;
}

.about-card ul {
    list-style: none;
}

.about-card ul li {
    margin-bottom: 0.8rem;
    color: var(--secondary-text-color);
    display: flex;
    align-items: center;
}

.about-card ul li svg {
    margin-right: 0.8rem;
    width: 20px;
    height: 20px;
    color: var(--accent-color);
}

/* Skills Section */
.bg-darker {
    background-color: var(--bg-darker);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
}

.skill-card {
    background-color: var(--bg-color);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.skill-card h3 {
    display: flex;
    align-items: center;
    color: var(--accent-color);
    margin-bottom: var(--spacing-unit);
}

.icon-skill {
    width: 28px;
    height: 28px;
    margin-right: 0.8rem;
    color: var(--focus-color); /* Un color ligeramente diferente para los iconos de skill */
}


/* Contact Section */
.contact-section {
    text-align: center;
}

.contact-intro {
    font-size: 1.2rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--secondary-text-color);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--bg-darker);
    padding: calc(var(--spacing-unit) * 2);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 15px rgba(0,0,0,0.3);
}

.form-group {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(var(--accent-color-rgb), 0.3); /* Simula el focus de GNOME */
}

.form-group textarea {
    resize: vertical; /* Permite redimensionar verticalmente */
    min-height: 120px;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background-color: var(--bg-darker);
    padding: calc(var(--spacing-unit) * 2) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-text-color);
    font-size: 0.9rem;
}

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

.footer p {
    margin: 0;
}

.social-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 0.8);
}

.social-links img {
    width: 24px;
    height: 24px;
    filter: invert(70%) sepia(10%) saturate(200%) hue-rotate(180deg) brightness(120%) contrast(90%); /* Para que los iconos se vean bien en fondo oscuro */
    transition: filter 0.3s ease;
}

.social-links img:hover {
    filter: invert(50%) sepia(90%) saturate(1000%) hue-rotate(190deg) brightness(100%) contrast(100%); /* Cambia el color al pasar el ratón */
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-section .container {
        flex-direction: column;
        text-align: center;
    }
    .hero-content {
        margin-right: 0;
        margin-bottom: calc(var(--spacing-unit) * 3);
    }
    .hero-image {
        margin-left: 0;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .about-card {
        margin-top: calc(var(--spacing-unit) * 2);
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.4rem; }

    .hero-content h1 {
        font-size: 3rem;
    }
    .hero-content h2 {
        font-size: 2rem;
    }
    .hero-content .tagline {
        font-size: 1.1rem;
    }
    .navbar .logo {
        font-size: 1.5rem;
    }
    .navbar ul {
        flex-direction: column;
        align-items: center;
        margin-top: var(--spacing-unit);
    }
    .navbar ul li {
        margin: 0.5rem 0;
    }
    .footer .container {
        flex-direction: column;
        gap: var(--spacing-unit);
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
    }
    .hero-image .placeholder-img {
        width: 200px;
        height: 200px;
    }
    .icon-code {
        width: 80px;
        height: 80px;
    }
    .skills-grid {
        grid-template-columns: 1fr;
    }
    .btn {
        width: 100%;
        margin-right: 0;
        margin-bottom: var(--spacing-unit);
    }
}