/* ============================================================
   SIGMA NORTHLAKE — sistema de diseño
   Estética minimalista y austera: fondo casi negro, texto claro,
   mucho espacio en blanco, tipografía sobria. Inspirado en el tono
   de un fondo privado "solo por invitación".
   ============================================================ */

:root {
    /* –––– Paleta oficial (Manual de identidad SIGMA NORTHLAKE) –––– */
    --sig-negro:        #0D1823;   /* Azul Northlake — fondo principal de web */
    --sig-negro-2:      #172534;   /* Azul grafito — tarjetas, paneles, footer */
    --sig-profundo:     #08111A;   /* Azul profundo — máxima profundidad */
    --sig-borde:        #1f2c3b;   /* líneas y separadores sutiles */
    --sig-texto:        #F7F5EF;   /* Marfil Sigma — texto principal */
    --sig-texto-tenue:  #AAB3BC;   /* Gris niebla — texto secundario */
    --sig-texto-debil:  #6c7681;   /* metadatos, legal, notas */
    --sig-acento:       #C5A66A;   /* Oro discreto — acentos, nunca dominante */
    --sig-acento-claro: #d8bd86;
    --sig-blanco:       #ffffff;

    /* –––– Tipografía (Manual: Montserrat titulares, Inter cuerpo) –––– */
    --sig-fuente:        "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --sig-fuente-titulo: "Montserrat", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* –––– Ritmo vertical –––– */
    --sig-seccion-y: clamp(5rem, 12vh, 9rem);
    --sig-ancho-max: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* Textura global muy tenue (líneas diagonales) como capa fija de fondo */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: url("/img/textura-lineas.webp");
    background-size: cover;
    background-position: center;
    opacity: 0.12;
    pointer-events: none;
}

body {
    margin: 0;
    background-color: var(--sig-negro);
    color: var(--sig-texto);
    font-family: var(--sig-fuente);
    font-size: 1.0625rem;
    line-height: 1.7;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* ============================================================
   Tipografía
   ============================================================ */

h1, h2, h3, h4 {
    font-family: var(--sig-fuente-titulo);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--sig-texto);
    margin: 0 0 0.6em;
}

.sig-display {
    font-family: var(--sig-fuente-titulo);
    font-size: clamp(2.6rem, 7vw, 5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.sig-eyebrow {
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--sig-acento);
    margin-bottom: 1.5rem;
    display: block;
}

.sig-lead {
    font-size: clamp(1.15rem, 2.2vw, 1.4rem);
    color: var(--sig-texto-tenue);
    font-weight: 300;
    line-height: 1.6;
}

p { margin: 0 0 1.2rem; }

a { color: var(--sig-acento-claro); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--sig-blanco); }

/* ============================================================
   Layout / secciones
   ============================================================ */

.sig-contenedor {
    width: 100%;
    max-width: var(--sig-ancho-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.sig-seccion {
    padding-top: var(--sig-seccion-y);
    padding-bottom: var(--sig-seccion-y);
    border-top: 1px solid var(--sig-borde);
}

.sig-seccion--sin-linea { border-top: none; }

/* ============================================================
   Cabecera / navegación
   ============================================================ */

.sig-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.3rem 1.5rem;
    background: rgba(13, 24, 35, 0);
    transition: background .35s ease, border-color .35s ease, padding .35s ease;
    border-bottom: 1px solid transparent;
}

/* Degradado oscuro difuminado detrás de la barra: garantiza legibilidad sobre
   cualquier fondo del hero (aunque sea claro). Desaparece al fijar la barra. */
.sig-nav::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 0;
    height: 180%;
    background: linear-gradient(to bottom,
        rgba(8, 17, 26, 0.78) 0%,
        rgba(8, 17, 26, 0.40) 52%,
        transparent 100%);
    z-index: -1;
    pointer-events: none;
    transition: opacity .35s ease;
}
.sig-nav.is-scrolled::before { opacity: 0; }

.sig-nav.is-scrolled {
    background: rgba(13, 24, 35, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom-color: var(--sig-borde);
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.sig-marca {
    font-weight: 600;
    letter-spacing: 0.18em;
    font-size: 0.95rem;
    text-transform: uppercase;
    color: var(--sig-blanco);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.sig-marca:hover { color: var(--sig-blanco); }

.sig-marca__punto {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--sig-acento);
    display: inline-block;
}

.sig-marca__logo {
    height: 26px;
    width: auto;
    display: block;
}
.sig-footer .sig-marca__logo { height: 30px; }

.sig-nav__links {
    display: flex;
    align-items: center;
    gap: 2.2rem;
    list-style: none;
    margin: 0; padding: 0;
}

.sig-nav__links a {
    color: rgba(247, 245, 239, 0.88);
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    text-shadow: 0 1px 8px rgba(8, 17, 26, 0.55);
}
.sig-nav__links a:hover { color: var(--sig-blanco); }
/* El botón "Acceso privado" ya tiene borde propio; no necesita sombra de texto */
.sig-nav__links a.sig-btn { text-shadow: none; }

.sig-nav__toggle {
    display: none;
    background: none; border: none;
    color: var(--sig-texto);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ============================================================
   Botones
   ============================================================ */

.sig-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.6rem;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    border-radius: 2px;
    border: 1px solid var(--sig-borde);
    color: var(--sig-texto);
    background: transparent;
    cursor: pointer;
    transition: all .22s ease;
}
.sig-btn:hover {
    border-color: var(--sig-acento);
    color: var(--sig-blanco);
    background: rgba(197, 166, 106, 0.06);
}

.sig-btn--acento {
    background: var(--sig-acento);
    border-color: var(--sig-acento);
    color: #14110a;
    font-weight: 600;
}
.sig-btn--acento:hover {
    background: var(--sig-acento-claro);
    border-color: var(--sig-acento-claro);
    color: #14110a;
}

/* ============================================================
   Hero
   ============================================================ */

.sig-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    /* Fondo con degradado sutil; se puede superponer una imagen en .sig-hero__fondo */
    background:
        radial-gradient(120% 80% at 70% 15%, rgba(197, 166, 106, 0.07), transparent 55%),
        radial-gradient(90% 70% at 15% 90%, rgba(60, 80, 120, 0.10), transparent 60%);
}

/* Vídeo de fondo del hero (con póster estático de respaldo).
   Ligero escalado para dar recorrido al parallax de scroll sin descubrir bordes. */
.sig-hero__media {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
    transform: translate3d(0, 0, 0) scale(1.06);
    will-change: transform;
}

/* Velo para legibilidad del titular: scrim más denso a la izquierda + base inferior.
   La imagen ya es luminosa, así que el velo es lo justo para leer el texto marfil. */
.sig-hero__velo {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        linear-gradient(100deg,
            rgba(13, 24, 35, 0.88) 0%,
            rgba(13, 24, 35, 0.60) 28%,
            rgba(13, 24, 35, 0.20) 55%,
            rgba(13, 24, 35, 0.08) 80%),
        linear-gradient(to top,
            rgba(13, 24, 35, 0.55) 0%,
            rgba(13, 24, 35, 0.10) 30%,
            transparent 55%);
}

.sig-hero__contenido {
    position: relative;
    z-index: 1;
    max-width: 860px;
}

.sig-hero__tagline {
    margin-top: 1.8rem;
    max-width: 640px;
}

.sig-hero__cta {
    margin-top: 2.6rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.sig-hero__scroll {
    position: absolute;
    bottom: 2rem; left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    color: var(--sig-texto-debil);
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* ============================================================
   Rejilla de principios / bullets
   ============================================================ */

.sig-grid {
    display: grid;
    gap: 2.5rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    margin-top: 3.5rem;
}

.sig-principio__num {
    font-size: 0.8rem;
    color: var(--sig-acento);
    letter-spacing: 0.2em;
    margin-bottom: 0.9rem;
}
.sig-principio h3 { font-size: 1.3rem; }
.sig-principio p { color: var(--sig-texto-tenue); font-size: 1rem; margin: 0; }

/* Tarjetas de estrategia */
.sig-tarjeta {
    background: var(--sig-negro-2);
    border: 1px solid var(--sig-borde);
    border-radius: 4px;
    padding: 2rem;
    transition: border-color .25s ease, transform .25s ease;
}
.sig-tarjeta:hover { border-color: rgba(197, 166, 106,0.4); transform: translateY(-3px); }
.sig-tarjeta h3 { font-size: 1.15rem; }
.sig-tarjeta p { color: var(--sig-texto-tenue); font-size: 0.98rem; margin: 0; }

/* ============================================================
   Encabezados de sección
   ============================================================ */

.sig-cabecera-seccion { max-width: 720px; margin-bottom: 1rem; }
.sig-cabecera-seccion h2 { font-size: clamp(1.8rem, 4vw, 2.7rem); }

/* Bloque de dos columnas (texto grande + apoyo) */
.sig-dos-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}
@media (max-width: 820px) { .sig-dos-col { grid-template-columns: 1fr; gap: 2.5rem; } }

/* Frase-manifiesto grande */
.sig-manifiesto {
    font-family: var(--sig-fuente-titulo);
    font-size: clamp(1.8rem, 4.5vw, 3.2rem);
    font-weight: 500;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--sig-texto);
    max-width: 900px;
}
.sig-manifiesto strong { font-weight: 600; color: var(--sig-acento-claro); }

/* ============================================================
   Acceso privado
   ============================================================ */

.sig-acceso {
    position: relative;
    text-align: center;
    overflow: hidden;
    background-color: var(--sig-negro);
}
.sig-acceso__fondo {
    position: absolute;
    inset: -12% 0;                /* margen extra para el parallax */
    z-index: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.6;
    transform: translate3d(0, 0, 0);
    will-change: transform;
}
.sig-acceso__velo {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: radial-gradient(90% 130% at 50% 50%,
        rgba(13, 24, 35, 0.55) 0%,
        rgba(13, 24, 35, 0.86) 65%,
        var(--sig-negro) 100%);
}
.sig-acceso > .sig-contenedor { position: relative; z-index: 1; }
.sig-acceso .sig-manifiesto { margin: 0 auto 2rem; }

/* ============================================================
   Formulario de contacto
   ============================================================ */

.sig-form { max-width: 620px; }

.sig-form__campo { margin-bottom: 1.4rem; }

.sig-form label {
    display: block;
    font-size: 0.82rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--sig-texto-tenue);
    margin-bottom: 0.5rem;
}

.sig-form input,
.sig-form textarea,
.sig-form select {
    width: 100%;
    background: var(--sig-negro-2);
    border: 1px solid var(--sig-borde);
    border-radius: 3px;
    color: var(--sig-texto);
    padding: 0.85rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color .2s ease;
}
.sig-form input:focus,
.sig-form textarea:focus,
.sig-form select:focus {
    outline: none;
    border-color: var(--sig-acento);
}
.sig-form textarea { resize: vertical; min-height: 130px; }

.sig-form__nota { color: var(--sig-texto-debil); font-size: 0.85rem; margin-top: 1rem; }

.sig-alerta {
    padding: 1rem 1.2rem;
    border-radius: 3px;
    border: 1px solid;
    margin-bottom: 1.6rem;
    font-size: 0.95rem;
}
.sig-alerta--ok    { border-color: rgba(120,180,120,0.4); background: rgba(120,180,120,0.08); color: #bfe0bf; }
.sig-alerta--error { border-color: rgba(200,120,120,0.4); background: rgba(200,120,120,0.08); color: #e8bcbc; }

.sig-form .text-danger,
.field-validation-error { color: #e8a0a0; font-size: 0.85rem; }

/* ============================================================
   Footer
   ============================================================ */

.sig-footer {
    background: var(--sig-negro-2);
    border-top: 1px solid var(--sig-borde);
    padding: 4rem 0 2.5rem;
    color: var(--sig-texto-debil);
    font-size: 0.85rem;
    line-height: 1.7;
}
.sig-footer__top {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 3rem;
}
.sig-footer__links { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.sig-footer__links a { color: var(--sig-texto-tenue); font-size: 0.85rem; }
.sig-footer h4 {
    font-size: 0.78rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--sig-texto-tenue);
    margin-bottom: 0.8rem;
}
.sig-footer__legal {
    border-top: 1px solid var(--sig-borde);
    padding-top: 2rem;
    display: grid;
    gap: 1rem;
}
.sig-footer__aviso { color: var(--sig-texto-debil); }
.sig-footer__aviso strong { color: var(--sig-texto-tenue); }
.sig-footer__copy {
    margin-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--sig-texto-debil);
}

/* ============================================================
   Animación de aparición al hacer scroll
   ============================================================ */

.sig-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .7s ease, transform .7s ease;
}
.sig-reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .sig-reveal { opacity: 1; transform: none; transition: none; }
    .sig-hero__media { transform: scale(1.06); }
}

/* ============================================================
   Responsive: navegación móvil
   ============================================================ */

@media (max-width: 760px) {
    .sig-nav__toggle { display: block; }
    .sig-nav__links {
        position: fixed;
        top: 0; right: 0;
        height: 100vh;
        width: min(78vw, 320px);
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        gap: 1.8rem;
        padding: 2.5rem;
        background: var(--sig-negro-2);
        border-left: 1px solid var(--sig-borde);
        transform: translateX(100%);
        transition: transform .3s ease;
    }
    .sig-nav__links.is-open { transform: translateX(0); }
    .sig-nav__links a { font-size: 1.15rem; }
}

/* Utilidades */
.sig-mt-0 { margin-top: 0; }
.sig-text-tenue { color: var(--sig-texto-tenue); }
.sig-sep { height: 1px; background: var(--sig-borde); border: none; margin: 3rem 0; }