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

/* -----
    ROOT — VARIABLES GLOBALES
   Cambiar colores, fuentes y espaciados acá
   afecta toda la página automáticamente
----- */
:root {
    /* Colores principales — cambiar acá para rebranding */
    --color-dark: #0d1b2a;
    /* azul marino oscuro */
    --color-dark-alt: #1e3048;
    /* azul marino medio (bordes, separadores) */
    --color-gold: #c9a84c;
    /* dorado principal */
    --color-gold-hover: #e0bc60;
    /* dorado hover */
    --color-white: #ffffff;
    --color-gray-light: #c8c8c8;
    /* texto secundario claro */
    --color-gray-mid: #888888;
    /* texto terciario */
    --color-bg: #f5f5f5;
    /* fondo general de la página */

    /* Tipografía */
    --font-main: 'Segoe UI', Arial, sans-serif;
    --font-size-sm: 0.82rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 2rem;
    --font-size-xxl: 3rem;

    /* Espaciado */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* Tamaños de íconos */
    --icon-size-sm: 0.875rem;
    --icon-size-md: 1.125rem;
    --icon-size-lg: 1.375rem;
    --icon-size-xl: 2.5rem;

    /* Layout */
    --max-width: 1280px;
    --nav-height: 68px;
    --transition: 0.2s ease;
}

/* ----- BODY ----- */
body {
    font-family: var(--font-main);
    background: var(--color-bg);
}

/* -----
    NAVBAR
    - Sticky en el top
    - Hamburger con CSS puro (#nav-check)
    - CTA dorado a la derecha
----- */
.header {
    background-color: var(--color-dark);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: var(--nav-height);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-logo {
    color: var(--color-white);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-decoration: none;
    white-space: nowrap;
    margin-right: auto;
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    color: var(--color-gray-light);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.04em;
    padding: 0.4rem 0.75rem;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
    white-space: nowrap;
}

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

.nav-link.active {
    color: var(--color-gold);
    border-bottom-color: var(--color-gold);
}

.nav-cta {
    background-color: var(--color-gold);
    color: var(--color-dark);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 0.55rem 1.25rem;
    white-space: nowrap;
    transition: background-color var(--transition);
}

.nav-cta:hover {
    background-color: var(--color-gold-hover);
}

/* Hamburger */
#nav-check {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    margin-left: auto;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: transform 0.3s, opacity 0.3s;
}

#nav-check:checked~.nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

#nav-check:checked~.nav-toggle span:nth-child(2) {
    opacity: 0;
}

#nav-check:checked~.nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* -----
    HERO
    - Imagen de fondo: cambiar url() en .hero
    - Altura mínima: min-height
    - El gradiente oscurece la izquierda para legibilidad
----- */
.hero {
    position: relative;
    min-height: 520px;
    background-image: url('../img/Ushuaia--Argentina.png');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to right,
            rgba(13, 27, 42, 0.88) 0%,
            rgba(13, 27, 42, 0.55) 55%,
            rgba(13, 27, 42, 0.15) 100%);
}

.hero-content {
    position: relative;
    margin: 0 auto;
    max-width: 560px;
}

.hero-title {
    font-size: clamp(2rem, 4vw, var(--font-size-xxl));
    font-weight: 800;
    color: var(--color-white);
    line-height: 1.1;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

.hero-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-gold);
    margin-top: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gray-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    max-width: 380px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ----- BOTONES GLOBALES ----- */
.btn {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0.65rem 1.4rem;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition);
    white-space: nowrap;
}

.btn-gold {
    background-color: var(--color-gold);
    color: var(--color-dark);
    border: 2px solid var(--color-gold);
}

.btn-gold:hover {
    background-color: var(--color-gold-hover);
    border-color: var(--color-gold-hover);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.btn-outline:hover {
    background-color: var(--color-white);
    color: var(--color-dark);
}

/* -----
    PILLARS (5 valores)
    - Desktop: grilla de 5 columnas
    - Mobile: carrusel (ver responsive)
    - Fondo oscuro con íconos dorados
----- */
.pillars {
    background-color: var(--color-dark);
    padding: var(--spacing-lg) 0;
}

.pillars-carousel {
    position: relative;
    /* necesario para posicionar las flechas */
}

.pillars-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
}

.pillar {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-sm);
    border-right: 1px solid var(--color-dark-alt);
}

.pillar:last-child {
    border-right: none;
}

.pillar-icon {
    margin-bottom: var(--spacing-md);
}

.pillar-icon i {
    font-size: var(--icon-size-xl);
    color: var(--color-gold);
}

.pillar-title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.pillar-text {
    font-size: 0.75rem;
    color: var(--color-gray-mid);
    line-height: 1.6;
}

/* Flechas del carrusel — ocultas en desktop, visibles en mobile */
.carousel-btn {
    display: none;
}

/* -----
    ÍCONOS — tamaños globales por contexto
----- */
.service-icon i {
    font-size: var(--icon-size-lg);
    color: var(--color-gold);
    flex-shrink: 0;
}

.project-icon i {
    font-size: var(--icon-size-md);
    color: var(--color-gold);
}

.track-list i {
    font-size: var(--icon-size-sm);
    color: var(--color-gold);
    flex-shrink: 0;
    margin-top: 2px;
}

.sector-item i {
    font-size: var(--icon-size-lg);
    color: var(--color-gold);
    flex-shrink: 0;
}

.why-item i {
    font-size: var(--icon-size-md);
    color: var(--color-gold);
    flex-shrink: 0;
    margin-top: 3px;
}

/* -----
    WHO WE ARE / ABOUT
    - Imagen de fondo: cambiar url() en .about
    - Izquierda: fondo blanco semitransparente
    - Derecha: fondo oscuro con lista de servicios
----- */
.about {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 100%;
    min-height: 500px;
    background-image: url('../img/escalando.png');
    background-size: cover;
    background-position: center;
    align-items: stretch;
}

.about-left {
    position: relative;
    z-index: 1;
    background-color: rgba(245, 245, 245, 0.95);
    padding: var(--spacing-xl) var(--spacing-lg);
    max-width: 500px;
}

.about-right {
    position: relative;
    z-index: 1;
    background-color: #0d1b2af2;
    padding: var(--spacing-lg);
    width: 25rem;
    max-width: 70%;
    margin-left: 40%;
}

.section-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--spacing-md);
}

.about-title {
    font-size: clamp(1.5rem, 2.5vw, var(--font-size-xl));
    font-weight: 800;
    color: var(--color-dark);
    text-transform: uppercase;
    line-height: 1.15;
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-size: var(--font-size-sm);
    color: #444;
    line-height: 1.75;
    margin-bottom: var(--spacing-md);
}

.services-list {
    list-style: none;
    display: flex;
    width: 20rem;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.service-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-dark-alt);
}

.service-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.service-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.service-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.2rem;
}

.service-text {
    font-size: 0.75rem;
    color: var(--color-gray-mid);
    line-height: 1.5;
}

/* -----
    CURRENT PROJECTS
    - Desktop: grilla de 6 columnas
    - Mobile: carrusel horizontal
    - Cambiar imagen: src en cada img
    - Cambiar ícono: clase fa-solid fa-NOMBRE
----- */
.projects-section {
    background-color: var(--color-bg);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid #e0e0e0;
}

.projects-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.projects-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.projects-line {
    flex: 1;
    height: 1px;
    background-color: var(--color-gold);
}

.projects-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold);
    white-space: nowrap;
}

.projects-carousel {
    position: relative;
    /* necesario para posicionar las flechas */
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-md);
}

.project-card {
    display: flex;
    flex-direction: column;
}

.project-img-wrap {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    background-color: #ccc;
}

.project-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.project-icon {
    position: absolute;
    bottom: var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-dark);
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-name {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-dark);
    line-height: 1.4;
    margin-bottom: 0.25rem;
}

.project-location {
    font-size: 0.7rem;
    color: var(--color-gray-mid);
}

/* -----
    BOTTOM STRIP (3 columnas)
    - Track Record: lista de proyectos
    - Client Sectors: sectores con íconos
    - Why Helvetia: imagen de fondo + razones
----- */
.bottom-strip {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
}

.track-record {
    padding: var(--spacing-xl) var(--spacing-lg);
    background-color: var(--color-bg);
}

.client-sectors {
    padding: var(--spacing-xl) var(--spacing-lg);
    background-color: var(--color-bg);
    border-left: 1px solid #e0e0e0;
    border-right: 1px solid #e0e0e0;
}

/* Imagen de fondo: cambiar url() */
.why-helvetia {
    padding: 20px 30px;
    background-image: url('../img/cordillera.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.strip-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-dark);
    margin-bottom: var(--spacing-lg);
}

.strip-title--light {
    color: var(--color-white);
}

.track-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.track-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 0.78rem;
    color: #444;
    line-height: 1.5;
}

.sectors-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sector-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: #444;
}

.why-list {
    list-style: none;
    display: flex;
    width: 20rem;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.why-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.why-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.3rem;
}

.why-text {
    font-size: 0.78rem;
    color: var(--color-gray-mid);
    line-height: 1.6;
}

/* -----
    FOOTER
    - 3 columnas: brand / contacto / CTA
    - Imagen decorativa: .img-footer (cordillera)
    - Pie de página: copyright + links legales
----- */
.footer {
    background-color: var(--color-dark);
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    background-blend-mode: overlay;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Imagen con desvanecido en los bordes */
.img-footer {
    background-image: url(../img/cordillera.png);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    width: 100%;
    height: 150px;
    border-radius: 30px;
    padding: 5px 20px;
    mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-sm);
    padding: 10px 5px;
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray-light);
    margin-bottom: 0.25rem;
}

.footer-addr {
    font-size: var(--font-size-sm);
    color: var(--color-gray-mid);
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-contact-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-gray-light);
    font-size: var(--font-size-sm);
}

.footer-contact-list i {
    color: var(--color-gold);
    font-size: var(--font-size-md);
}

.footer-contact-list a {
    color: var(--color-gray-light);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-contact-list a:hover {
    color: var(--color-gold);
}

.footer-cta-text {
    font-size: var(--font-size-sm);
    color: var(--color-gray-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-dark-alt);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom p {
    font-size: 0.72rem;
    color: var(--color-gray-mid);
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    font-size: 0.72rem;
    color: var(--color-gray-mid);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* -----
    RESPONSIVE — TABLET Y MOBILE (max 900px)
----- */
@media (max-width: 900px) {

    /* NAV */
    .nav-toggle {
        display: flex;
    }

    .nav-cta {
        display: none;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background-color: var(--color-dark);
        padding: var(--spacing-md) var(--spacing-lg) 1.5rem;
        border-top: 1px solid var(--color-dark-alt);
    }

    #nav-check:checked~.nav-menu {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-dark-alt);
        font-size: 0.9rem;
    }

    .nav-link.active {
        border-bottom-color: var(--color-dark-alt);
        color: var(--color-gold);
    }

    /* HERO */
    .hero-content {
        padding-left: var(--spacing-lg);
        max-width: 100%;
    }

    /* PILLARS — carrusel en mobile */
    .pillars-inner {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 0;
        padding-bottom: var(--spacing-sm);
        scroll-behavior: smooth;
        max-width: 100%;
    }

    .pillars-inner::-webkit-scrollbar {
        display: none;
    }

    .pillar {
        min-width: 75vw;
        scroll-snap-align: center;
        border-right: 1px solid var(--color-dark-alt);
        border-bottom: none;
        flex-shrink: 0;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .pillar:last-child {
        border-right: none;
        grid-column: auto;
    }

    /* Flechas carrusel — visibles en mobile */
    .carousel-btn {
        display: flex;
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        background-color: var(--color-dark-alt);
        border: 1px solid var(--color-gold);
        color: var(--color-gold);
        width: 36px;
        height: 36px;
        border-radius: 50%;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        z-index: 10;
        transition: background-color var(--transition);
    }

    .carousel-btn:hover {
        background-color: var(--color-gold);
        color: var(--color-dark);
    }

    .carousel-btn--prev {
        left: 8px;
    }

    .carousel-btn--next {
        right: 8px;
    }

    /* PROJECTS — carrusel en mobile */
    .projects-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
        gap: var(--spacing-md);
        padding-bottom: var(--spacing-sm);
    }

    .projects-grid::-webkit-scrollbar {
        display: none;
    }

    .project-card {
        min-width: 70vw;
        scroll-snap-align: center;
        flex-shrink: 0;
    }

    .project-img-wrap {
        aspect-ratio: 16 / 9;
    }

    /* ABOUT */
    .about {
        grid-template-columns: 1fr;
    }

    .about-left {
        max-width: 100%;
    }

    .about-right {
        width: 100%;
        max-width: 100%;
        margin-left: 0;
    }

    .services-list {
        width: 100%;
    }

    /* BOTTOM STRIP */
    .bottom-strip {
        grid-template-columns: 1fr;
    }

    .why-list {
        width: 100%;
    }

    .client-sectors {
        border-left: none;
        border-right: none;
        border-top: 1px solid #e0e0e0;
        border-bottom: 1px solid #e0e0e0;
    }

    /* FOOTER */
    .footer-inner {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* -----
    RESPONSIVE — MOBILE CHICO (max 480px)
----- */
@media (max-width: 480px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}