/* --- Reset & Variables Globales --- */
:root {
    --color-primario: #005AEF;
    --color-fondo: #FDFDFD;
    --color-texto: #1a1a1a;
    --color-secundario: #6c757d;
    --color-fondo-seccion: #f4f7fc;
    --color-borde: #e9ecef;
    --color-header: rgba(253, 253, 253, 0.85);
    --sombra-suave: 0 4px 15px rgba(0, 0, 0, 0.05);
    --sombra-elevada: 0 8px 25px rgba(0, 0, 0, 0.1);
    --radio-borde: 12px;
    --transicion-suave: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] {
    --color-primario: #3685ff;
    --color-fondo: #121212;
    --color-texto: #e1e1e1;
    --color-secundario: #a0a0a0;
    --color-fondo-seccion: #1a1a1a;
    --color-borde: #2c2c2c;
    --color-header: rgba(26, 26, 26, 0.85);
    --sombra-suave: 0 4px 15px rgba(0, 0, 0, 0.2);
    --sombra-elevada: 0 8px 25px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--color-fondo);
    color: var(--color-texto);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: var(--transicion-suave);
}

/* --- Componentes y Utilidades --- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Mensaje de Error para Proyectos --- */
.error-message {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
    border-radius: var(--radio-borde);
    color: white;
    margin: 20px 0;
    box-shadow: var(--sombra-suave);
}

.error-message p {
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0;
}

[data-theme="dark"] .error-message {
    background: linear-gradient(135deg, #ff4757, #c44569);
}

section {
    padding: 100px 0;
    overflow: hidden;
    transition: var(--transicion-suave);
}

section:nth-of-type(odd) {
    background-color: var(--color-fondo-seccion);
}

.section-titulo {
    text-align: center;
    margin-bottom: 20px;
    font-size: 2.8rem;
    font-weight: 700;
    position: relative;
    color: var(--color-texto);
}

.section-subtitulo {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px auto;
    color: var(--color-secundario);
    font-size: 1.1rem;
}

.section-titulo::after {
    content: '';
    display: block;
    width: 70px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primario), #9370DB);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* --- Encabezado y Navegación --- */
.header {
    background-color: var(--color-header);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-borde);
    padding: 18px 0;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--sombra-suave);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primario);
    text-decoration: none;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    gap: 35px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 35px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-texto);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding-bottom: 5px;
}

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

.nav-link:hover {
    color: var(--color-primario);
}

.nav-link:hover::after {
    width: 100%;
}

/* --- Theme Toggle Switch --- */
.theme-switcher {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.theme-toggle {
    opacity: 0;
    position: absolute;
}

.toggle-label {
    width: 50px;
    height: 26px;
    background-color: #ccc;
    border-radius: 50px;
    position: relative;
    transition: background-color 0.3s ease;
}

.toggle-label .ball {
    width: 22px;
    height: 22px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
}

.theme-toggle:checked + .toggle-label {
    background-color: var(--color-primario);
}

.theme-toggle:checked + .toggle-label .ball {
    transform: translateX(24px);
}

/* --- Sección Hero --- */
#hero {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: calc(100vh - 80px);
    background-color: var(--color-fondo);
}

.hero-contenido {
    max-width: 850px;
    animation: fadeIn 1s ease-in-out;
}

.hero-contenido h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
}

.hero-contenido h1 span {
    background: -webkit-linear-gradient(45deg, var(--color-primario), #9370DB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-contenido .subtitulo {
    font-size: 1.4rem;
    color: var(--color-secundario);
    margin-bottom: 30px;
    font-weight: 400;
}

.cta-button {
    display: inline-block;
    background: var(--color-primario);
    color: white;
    padding: 14px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 90, 239, 0.2);
}

.cta-button:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 90, 239, 0.3);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radio-borde);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primario);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-secundario);
    margin-top: 5px;
    font-weight: 500;
}

/* --- Sección Sobre Mí --- */
.sobre-mi-contenido {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.sobre-mi-contenido p {
    font-size: 1.15rem;
    margin-bottom: 20px;
    color: var(--color-secundario);
}

.sobre-mi-contenido strong {
    color: var(--color-texto);
}

/* --- Sección Proyectos --- */
.proyectos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 35px;
}

.proyecto-card {
    background-color: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: var(--radio-borde);
    overflow: hidden;
    box-shadow: var(--sombra-suave);
    transition: transform 0.3s ease, box-shadow 0.3s ease, var(--transicion-suave);
    display: flex;
    flex-direction: column;
}

.proyecto-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--sombra-elevada);
}

.proyecto-info {
    padding: 30px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.proyecto-info h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
    color: var(--color-primario);
}

.proyecto-info p {
    color: var(--color-secundario);
    flex-grow: 1;
}

.proyecto-links {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-top: auto;
    padding-top: 20px;
}

.btn-proyecto {
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid transparent;
    font-size: 0.9rem;
}

.btn-primario {
    background-color: var(--color-primario);
    color: white;
    flex-grow: 1;
}

.btn-primario:hover {
    background-color: #0048c0;
    transform: translateY(-2px);
}

[data-theme="dark"] .btn-primario:hover {
    background-color: #529bff;
}

.btn-secundario {
    background-color: transparent;
    color: var(--color-primario);
    border-color: var(--color-borde);
}

.btn-secundario:hover {
    background-color: var(--color-fondo-seccion);
    border-color: var(--color-borde);
}

.btn-secundario svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* --- Sección Habilidades --- */
.habilidades-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.habilidades-categoria {
    margin-bottom: 60px;
    background: var(--color-fondo);
    border-radius: var(--radio-borde);
    padding: 40px 30px;
    box-shadow: var(--sombra-suave);
    border: 1px solid var(--color-borde);
    transition: transform 0.3s ease, box-shadow 0.3s ease, var(--transicion-suave);
}

.habilidades-categoria:hover {
    transform: translateY(-3px);
    box-shadow: var(--sombra-elevada);
}

.habilidades-categoria:last-child {
    margin-bottom: 0;
}

.categoria-titulo {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 35px;
    color: var(--color-texto);
    position: relative;
    padding-bottom: 15px;
}

.categoria-titulo::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primario), #9370DB);
    border-radius: 2px;
}

.habilidades-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.habilidad-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    border-radius: var(--radio-borde);
    background: var(--color-fondo-seccion);
    box-shadow: var(--sombra-suave);
    transition: all 0.3s ease;
    border: 1px solid var(--color-borde);
    position: relative;
    overflow: hidden;
}

.habilidad-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primario), #9370DB);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.habilidad-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-elevada);
    border-color: var(--color-primario);
}

.habilidad-item:hover::before {
    transform: scaleY(1);
}

.habilidad-item img, .habilidad-item svg {
    width: 45px;
    height: 45px;
    transition: transform 0.3s ease;
}

.habilidad-item:hover img,
.habilidad-item:hover svg {
    transform: scale(1.1);
}

.habilidad-item span {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-texto);
}

/* --- Sección Experiencia Laboral --- */
.experiencia-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.experiencia-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primario), transparent);
    transform: translateX(-50%);
}

.experiencia-item {
    position: relative;
    margin-bottom: 40px;
    padding: 30px;
    background: var(--color-fondo);
    border-radius: var(--radio-borde);
    box-shadow: var(--sombra-suave);
    border: 1px solid var(--color-borde);
    transition: var(--transicion-suave);
}

.experiencia-item::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 40px;
    width: 16px;
    height: 16px;
    background: var(--color-primario);
    border-radius: 50%;
    border: 3px solid var(--color-fondo);
    box-shadow: 0 0 0 3px var(--color-primario);
}

.experiencia-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 50px;
}

.experiencia-item:nth-child(odd) {
    margin-right: 50%;
    padding-right: 50px;
    text-align: right;
}

.experiencia-item:nth-child(odd)::before {
    right: -8px;
    left: auto;
}

.experiencia-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-elevada);
}

.experiencia-empresa {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primario);
    margin-bottom: 8px;
}

.experiencia-cargo {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-texto);
    margin-bottom: 8px;
}

.experiencia-fecha {
    font-size: 0.9rem;
    color: var(--color-secundario);
    margin-bottom: 15px;
    font-weight: 500;
}

.experiencia-descripcion {
    color: var(--color-texto);
    line-height: 1.6;
    margin-bottom: 15px;
}

.experiencia-tecnologias {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.experiencia-tecnologia {
    background: var(--color-primario);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.experiencia-logros {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--color-borde);
}

.experiencia-logros h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-texto);
    margin-bottom: 10px;
}

.experiencia-logros ul {
    list-style: none;
    padding: 0;
}

.experiencia-logros li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--color-secundario);
    font-size: 0.9rem;
}

.experiencia-logros li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primario);
    font-weight: bold;
}

@media (max-width: 768px) {
    .experiencia-timeline::before {
        left: 20px;
    }
    
    .experiencia-item {
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px !important;
        text-align: left !important;
    }
    
    .experiencia-item::before {
        left: -8px !important;
        right: auto !important;
    }
}

/* --- Sección Servicios Backend --- */
.servicios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.servicio-card {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: var(--radio-borde);
    padding: 30px;
    box-shadow: var(--sombra-suave);
    transition: transform 0.3s ease, box-shadow 0.3s ease, var(--transicion-suave);
    position: relative;
    overflow: hidden;
}

.servicio-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primario), #9370DB);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.servicio-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--sombra-elevada);
}

.servicio-card:hover::before {
    transform: scaleY(1);
}

.servicio-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primario), #9370DB);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
}

.servicio-icon svg {
    width: 30px;
    height: 30px;
}

.servicio-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-texto);
}

.servicio-card p {
    color: var(--color-secundario);
    margin-bottom: 20px;
    line-height: 1.6;
}

.servicio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: var(--color-fondo-seccion);
    color: var(--color-primario);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--color-borde);
}

/* --- Sección Código Backend --- */
.codigo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.codigo-card {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: var(--radio-borde);
    overflow: hidden;
    box-shadow: var(--sombra-suave);
    transition: transform 0.3s ease, box-shadow 0.3s ease, var(--transicion-suave);
}

.codigo-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-elevada);
}

.codigo-header {
    background: var(--color-fondo-seccion);
    padding: 20px 25px;
    border-bottom: 1px solid var(--color-borde);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.codigo-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-texto);
    margin: 0;
}

.codigo-lang {
    background: var(--color-primario);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.codigo-content {
    padding: 25px;
}

.codigo-content pre {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 0;
}

.codigo-content code {
    color: #d4d4d4;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* --- Sección Métricas --- */
.metricas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.metrica-card {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: var(--radio-borde);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--sombra-suave);
    transition: transform 0.3s ease, box-shadow 0.3s ease, var(--transicion-suave);
    position: relative;
    overflow: hidden;
}

.metrica-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primario), #9370DB);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.metrica-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-elevada);
}

.metrica-card:hover::before {
    transform: scaleX(1);
}

.metrica-valor {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-primario);
    margin-bottom: 10px;
    line-height: 1;
}

.metrica-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-texto);
    margin-bottom: 8px;
}

.metrica-desc {
    color: var(--color-secundario);
    font-size: 0.95rem;
}

/* --- Sección Contacto --- */
#contacto .container {
    text-align: center;
    max-width: 700px;
}

#contacto p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    color: var(--color-secundario);
}

/* --- Footer --- */
.footer {
    background-color: #1a1a1a;
    color: #a0a0a0;
    text-align: center;
    padding: 40px 0;
    transition: var(--transicion-suave);
}

.footer-socials {
    margin-bottom: 20px;
}

.footer-socials a {
    margin: 0 15px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.footer-socials a:hover {
    transform: scale(1.1);
}

.footer-socials img {
    width: 28px;
    height: 28px;
    filter: invert(0.7);
}

/* --- Animaciones y Responsividad --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    .hero-contenido h1 {
        font-size: 2.8rem;
    }
    .hero-contenido .subtitulo {
        font-size: 1.2rem;
    }
    .section-titulo {
        font-size: 2.2rem;
    }
    section {
        padding: 80px 0;
    }
    .habilidades-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    .habilidades-categoria {
        padding: 30px 20px;
    }
    .categoria-titulo {
        font-size: 1.5rem;
    }
    .servicios-grid {
        grid-template-columns: 1fr;
    }
    .codigo-grid {
        grid-template-columns: 1fr;
    }
    .metricas-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .metrica-valor {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .habilidades-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .habilidades-categoria {
        padding: 25px 15px;
    }
    .categoria-titulo {
        font-size: 1.3rem;
    }
    .habilidad-item {
        padding: 15px;
    }
    .habilidad-item img, .habilidad-item svg {
        width: 35px;
        height: 35px;
    }
    .habilidad-item span {
        font-size: 1rem;
    }
    .metricas-grid {
        grid-template-columns: 1fr;
    }
    .hero-contenido h1 {
        font-size: 2.2rem;
    }
    .section-titulo {
        font-size: 1.8rem;
    }
    .servicio-card, .codigo-card, .metrica-card {
        padding: 20px;
    }
}