/* =============================================
   VARIABLES Y RESET GENERAL
   ============================================= */

/* Variables de color — cambia aquí y cambia en toda la web */
:root {
    --color-primario: #0f172a;    /* Azul muy oscuro (navbar, footer) */
    --color-acento: #3b82f6;      /* Azul brillante (botones, links) */
    --color-fondo: #f8fafc;       /* Blanco grisáceo (fondo general) */
    --color-texto: #1e293b;       /* Gris oscuro (texto principal) */
    --color-texto-claro: #64748b; /* Gris medio (texto secundario) */
    --color-blanco: #ffffff;
    --fuente-principal: 'Segoe UI', Arial, sans-serif;
    --sombra: 0 2px 10px rgba(0, 0, 0, 0.1);
    --radio-borde: 8px;
}

/* Reset — elimina estilos por defecto del navegador */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Estilo base del body */
body {
    font-family: var(--fuente-principal);
    background-color: var(--color-fondo);
    color: var(--color-texto);
    line-height: 1.6;
}

/* Scroll suave al hacer clic en enlaces internos */
html {
    scroll-behavior: smooth;
}

/* =============================================
   NAVEGACIÓN
   ============================================= */

.navbar {
    background-color: var(--color-primario);
    position: sticky;    /* Se queda fija al hacer scroll */
    top: 0;
    z-index: 100;
    box-shadow: var(--sombra);
}

.nav-contenedor {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    color: var(--color-blanco);
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.activo {
    color: var(--color-acento);
}

/* Botón hamburguesa — oculto en escritorio */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-blanco);
    transition: all 0.3s;
}
/* =============================================
   HERO
   ============================================= */

.hero {
    background: linear-gradient(135deg, var(--color-primario) 0%, #1e3a5f 100%);
    color: var(--color-blanco);
    padding: 5rem 1.5rem;
}

.hero-contenedor {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.hero-saludo {
    color: var(--color-acento);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.hero-nombre {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.hero-titulo {
    font-size: 1.3rem;
    font-weight: 400;
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

.hero-descripcion {
    color: #cbd5e1;
    max-width: 520px;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.hero-botones {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Botones reutilizables en toda la web */
.btn {
    padding: 0.75rem 1.75rem;
    border-radius: var(--radio-borde);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    display: inline-block;
}

.btn-primario {
    background-color: var(--color-acento);
    color: var(--color-blanco);
}

.btn-primario:hover {
    background-color: #2563eb;
    transform: translateY(-2px);
}

.btn-secundario {
    border: 2px solid #475569;
    color: var(--color-blanco);
}

.btn-secundario:hover {
    border-color: var(--color-acento);
    color: var(--color-acento);
    transform: translateY(-2px);
}

/* FOTO */
.hero-foto {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    object-fit: cover;        /* Recorta la foto en círculo sin deformarla */
    border: 4px solid var(--color-acento);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
}
/* =============================================
   SECCIÓN SOBRE MÍ
   ============================================= */

.contenedor {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.sobre-mi {
    padding: 5rem 1.5rem;
}

.seccion-titulo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

/* Línea decorativa bajo los títulos de sección */
.seccion-titulo::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--color-acento);
    border-radius: 2px;
}

.sobre-mi-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.sobre-mi-texto p {
    margin-bottom: 1rem;
    color: var(--color-texto);
}

.sobre-mi-datos {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dato-card {
    background: var(--color-blanco);
    border-left: 3px solid var(--color-acento);
    padding: 0.9rem 1.2rem;
    border-radius: var(--radio-borde);
    box-shadow: var(--sombra);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}
/* =============================================
   HABILIDADES
   ============================================= */

.habilidades {
    background-color: var(--color-blanco);
    padding: 5rem 1.5rem;
}

.habilidades-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.habilidad-categoria h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--color-texto);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: #e0f2fe;
    color: #0369a1;
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.tag-idioma {
    background-color: #f0fdf4;
    color: #166534;
}

.tag-cert {
    background-color: #fef3c7;
    color: #92400e;
}

/* =============================================
   FOOTER
   ============================================= */

.footer {
    background-color: var(--color-primario);
    color: #94a3b8;
    padding: 2rem 1.5rem;
}

.footer-contenido {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--color-acento);
}

/* =============================================
   RESPONSIVE — MÓVIL Y TABLET
   ============================================= */

@media (max-width: 768px) {

    /* Hero en columna en móvil */
    .hero-contenedor {
        flex-direction: column-reverse;
        text-align: center;
    }

    .hero-nombre { font-size: 2rem; }

    .hero-botones { justify-content: center; }

    .hero-descripcion { margin: 0 auto 2rem; }

    /* Sobre mí en una columna */
    .sobre-mi-grid { grid-template-columns: 1fr; }

    /* Habilidades en una columna */
    .habilidades-grid { grid-template-columns: 1fr; }

    /* Menú hamburguesa visible */
    .nav-toggle { display: flex; }

    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-primario);
        padding: 1rem 1.5rem 2rem;
        gap: 1rem;
    }

    .nav-menu.abierto { display: flex; }

    .footer-contenido { flex-direction: column; text-align: center; }
}
/* =============================================
   CABECERA DE PÁGINA (education, projects, contact)
   ============================================= */

.page-header {
    background: linear-gradient(135deg, var(--color-primario) 0%, #1e3a5f 100%);
    color: var(--color-blanco);
    padding: 3.5rem 1.5rem;
    text-align: center;
}

.page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: #94a3b8;
    font-size: 1.05rem;
}

/* =============================================
   TIMELINE
   ============================================= */

.timeline-seccion {
    padding: 5rem 1.5rem;
}

.fondo-alterno {
    background-color: var(--color-blanco);
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

/* Línea vertical del timeline */
.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: #e2e8f0;
}

.timeline-item {
    position: relative;
    padding: 0 0 2.5rem 2rem;
}

/* Punto en la línea del timeline */
.timeline-item::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--color-acento);
    border: 2px solid var(--color-blanco);
    box-shadow: 0 0 0 2px var(--color-acento);
}

.timeline-fecha {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-acento);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-contenido {
    background: var(--color-blanco);
    border: 1px solid #e2e8f0;
    border-radius: var(--radio-borde);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--sombra);
}

.fondo-alterno .timeline-contenido {
    background: var(--color-fondo);
}

.timeline-contenido h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.timeline-lugar {
    color: var(--color-texto-claro);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.timeline-lista {
    padding-left: 1.25rem;
    color: var(--color-texto);
}

.timeline-lista li {
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}

/* Responsive timeline */
@media (max-width: 768px) {
    .page-header h1 { font-size: 1.7rem; }
    .timeline { padding-left: 1.25rem; }
    .timeline-item { padding-left: 1.5rem; }
}
/* =============================================
   PROYECTOS
   ============================================= */

.proyectos-seccion {
    padding: 5rem 1.5rem;
}

.proyectos-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.proyecto-card {
    background: var(--color-blanco);
    border-radius: var(--radio-borde);
    box-shadow: var(--sombra);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s;
}

.proyecto-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Colores del banner superior de cada card */
.proyecto-header {
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.proyecto-header--azul   { background: linear-gradient(135deg, #0f172a, #1e3a5f); }
.proyecto-header--verde  { background: linear-gradient(135deg, #064e3b, #065f46); }
.proyecto-header--naranja { background: linear-gradient(135deg, #92400e, #b45309); }
.proyecto-header--morado { background: linear-gradient(135deg, #4c1d95, #6d28d9); }

.proyecto-icono {
    font-size: 2.5rem;
}

.proyecto-cuerpo {
    padding: 1.5rem;
    flex: 1;
}

.proyecto-cuerpo h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.proyecto-cuerpo p {
    color: var(--color-texto-claro);
    font-size: 0.95rem;
    line-height: 1.6;
}

.proyecto-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #f1f5f9;
}

.proyecto-estado {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
}

.proyecto-estado--completado {
    background-color: #dcfce7;
    color: #166534;
}

.proyecto-estado--en-curso {
    background-color: #fef9c3;
    color: #854d0e;
}

/* Responsive proyectos */
@media (max-width: 768px) {
    .proyectos-grid { grid-template-columns: 1fr; }
}
/* =============================================
   CONTACTO
   ============================================= */

.contacto-seccion {
    padding: 5rem 1.5rem;
}

.contacto-grid {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 4rem;
    align-items: start;
}

.contacto-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.contacto-icono {
    font-size: 1.4rem;
    margin-top: 2px;
}

.contacto-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-texto-claro);
    margin-bottom: 0.2rem;
}

.contacto-info a {
    color: var(--color-acento);
    text-decoration: none;
}

.contacto-info a:hover {
    text-decoration: underline;
}

.disponibilidad {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: #f0fdf4;
    color: #166534;
    padding: 0.75rem 1rem;
    border-radius: var(--radio-borde);
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 0.5rem;
}

.disponibilidad-punto {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #22c55e;
    /* Animación pulso — el extra visual */
    animation: pulso 2s infinite;
    flex-shrink: 0;
}

@keyframes pulso {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(1.3); }
}

/* Formulario */
.formulario-contenedor {
    background: var(--color-blanco);
    border-radius: var(--radio-borde);
    padding: 2rem;
    box-shadow: var(--sombra);
}

.formulario {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 2rem;
}

.campo-grupo {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.campo-grupo label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-texto);
}

.campo-grupo input,
.campo-grupo textarea {
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--radio-borde);
    font-family: var(--fuente-principal);
    font-size: 0.95rem;
    color: var(--color-texto);
    transition: border-color 0.2s;
    background: var(--color-fondo);
}

.campo-grupo input:focus,
.campo-grupo textarea:focus {
    outline: none;
    border-color: var(--color-acento);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.campo-grupo textarea {
    resize: vertical;
    min-height: 120px;
}

.error-msg {
    color: #dc2626;
    font-size: 0.82rem;
    min-height: 1rem;
}

.btn-enviar {
    align-self: flex-start;
    margin-top: 0.5rem;
}

.exito-msg {
    background: #f0fdf4;
    color: #166534;
    padding: 1rem;
    border-radius: var(--radio-borde);
    border: 1px solid #bbf7d0;
    font-weight: 500;
}

/* Responsive contacto */
@media (max-width: 768px) {
    .contacto-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}
/* =============================================
   ANIMACIONES DE ENTRADA (scroll reveal)
   ============================================= */

/* Estado inicial: invisible y desplazado hacia abajo */
.animar {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Estado final: visible — el JS añade esta clase */
.animar.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Retrasos escalonados para grupos de elementos */
.animar:nth-child(2) { transition-delay: 0.1s; }
.animar:nth-child(3) { transition-delay: 0.2s; }
.animar:nth-child(4) { transition-delay: 0.3s; }

/* =============================================
   BOTÓN VOLVER ARRIBA
   ============================================= */

.btn-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--color-acento);
    color: var(--color-blanco);
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--sombra);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.2s;
    z-index: 99;
    /* Accesibilidad: se ve con teclado */
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.btn-top:hover {
    transform: translateY(-3px);
}
/* Selector de idioma */
.lang-selector {
    display: flex;
    gap: 0.3rem;
}

.lang-btn {
    background: none;
    border: 1px solid #475569;
    color: #94a3b8;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn:hover,
.lang-btn.activo {
    background-color: var(--color-acento);
    border-color: var(--color-acento);
    color: var(--color-blanco);
}

/* En móvil ocultar si no cabe */
@media (max-width: 480px) {
    .lang-selector { display: none; }
}