/* AMC Mecanocaucho (CN) - hoja de estilos del sitio, mobile-first.
   Los valores de marca y la estructura de cada componente salen del sitio real
   https://www.mecanocaucho.com/en (hero-product, link-cards-section, cta-section, cabecera y pie). */

/* ---------- Fuentes (autoalojadas: Google Fonts esta bloqueado en China) ---------- */
@font-face {
    font-family: "Open Sans";
    src: url("../fonts/OpenSans-Regular.woff") format("woff");
    font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
    font-family: "Open Sans";
    src: url("../fonts/OpenSans-SemiBold.woff") format("woff");
    font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
    font-family: "Open Sans";
    src: url("../fonts/OpenSans-Bold.woff") format("woff");
    font-weight: 700; font-style: normal; font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
    --primary: #0080c9;         /* azul de marca (mecanocaucho.com) */
    --primary-strong: #006bb0;  /* fondo de botones y texto azul: contraste AA sobre blanco */
    --dark: #222;
    --gray-100: #f5f5f5;
    --gray-200: #eaeaea;        /* fondo de pagina del sitio principal */
    --gray-300: #dcdcdc;
    --gray-400: #7c7c7c;
    --gray-500: #545454;
    --border-soft: #d1dce7;
    --radius: 8px;
    --font: "Open Sans", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --wrap: 1320px;
    --header-h: 96px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: #fff;
    color: var(--dark);
    font-family: var(--font);
    font-size: 1rem;
    line-height: 1.75;   /* el chino necesita mas interlineado que el latino */
}

main { flex: 1 0 auto; background: var(--gray-200); }

/* Los hijos de un flex/grid no encogen por debajo de su contenido (min-width:auto). */
body > * { min-width: 0; }

img { max-width: 100%; height: auto; display: block; }

a { color: var(--dark); text-decoration: none; transition: color .15s; }
a:hover { color: var(--primary); }

h1, h2, h3, h4 {
    margin: 0 0 .5em;
    font-weight: 600;
    line-height: 1.15;
    color: var(--dark);
}

p { margin: 0 0 1em; }

sup { font-size: .6em; line-height: 0; }

:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

/* Enlaces dentro de texto: oscuros con subrayado azul (como el sitio principal: hover azul) */
.prose a, .intro a {
    text-decoration: underline; text-decoration-color: var(--primary);
    text-decoration-thickness: 2px; text-underline-offset: 3px;
}

/* ---------- Botones ---------- */
.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-weight: 700;
    font-size: .9375rem;
    letter-spacing: .06em;
    line-height: 1.2;
    text-align: center;
    transition: background-color .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--primary-strong); color: #fff; }
.btn-primary:hover { background: var(--dark); color: #fff; }
/* Una sola flecha para todo el sitio (SVG como mascara: hereda el color del texto) */
:root {
    --arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 12h18M14 5l7 7-7 7'/%3E%3C/svg%3E");
}
@supports ((-webkit-mask-image: none) or (mask-image: none)) {
    .btn-arrow::after,
    .link-cards__item::after {
        content: ""; display: inline-block; flex: none;
        background-color: currentColor;
        -webkit-mask: var(--arrow) center / contain no-repeat;
        mask: var(--arrow) center / contain no-repeat;
    }
    .btn-arrow::after { width: 1.15em; height: 1.15em; margin-left: .6em; vertical-align: -.2em; }
}

/* Boton "pildora" de utilidad de la cabecera (como DOWNLOADS en el sitio principal) */
.pill {
    display: inline-block;
    padding: 5px 18px;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    background: #fff;
    font-size: .8125rem; font-weight: 700; letter-spacing: .08em; line-height: 1.6;
    color: var(--dark);
}
.pill:hover { border-color: var(--primary); color: var(--primary); }

/* ---------- Cabecera ---------- */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: #fff;
    border-bottom: 1px solid var(--gray-300);
    box-shadow: 0 1px 1px rgba(0, 0, 0, .06);
}
.header-row {
    position: relative;
    display: flex; align-items: center; justify-content: space-between;
    min-height: 64px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand img { width: 74px; height: auto; }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-burger {
    display: grid; place-items: center;
    width: 44px; height: 44px; cursor: pointer; border-radius: var(--radius);
}
.nav-burger span,
.nav-burger span::before,
.nav-burger span::after {
    content: ""; display: block; width: 22px; height: 2px;
    background: var(--dark); border-radius: 2px; position: relative;
    transition: transform .2s, top .2s, background-color .2s;
}
.nav-burger span::before { position: absolute; top: -7px; }
.nav-burger span::after { position: absolute; top: 7px; }
.nav-toggle:focus-visible ~ .nav-burger { outline: 3px solid var(--primary); outline-offset: 2px; }
.nav-toggle:checked ~ .nav-burger span { background: transparent; }
.nav-toggle:checked ~ .nav-burger span::before { top: 0; transform: rotate(45deg); }
.nav-toggle:checked ~ .nav-burger span::after { top: 0; transform: rotate(-45deg); }

/* Menu movil: panel desplegable bajo la cabecera */
.header-menu {
    display: none;
    position: absolute; left: 0; right: 0; top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--gray-300);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .08);
    padding: 12px 20px 20px;
}
.nav-toggle:checked ~ .header-menu { display: block; }
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav a { display: block; padding: 12px 0; color: var(--dark); font-weight: 600; }
.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--primary); }
.nav-util, .nav-cta { padding-top: 8px; }
.site-nav .pill {
    display: inline-flex; align-items: center; min-height: 40px;
    padding: 8px 18px; color: var(--dark); font-weight: 700;
}
.site-nav .btn-primary { display: block; color: #fff; padding: 14px 24px; }
.site-nav .btn-primary:hover,
.site-nav .btn-primary[aria-current="page"] { color: #fff; }

/* ---------- hero-product: foto a ancho completo con texto en blanco ---------- */
.hero {
    position: relative;
    display: flex; align-items: flex-start;
    min-height: clamp(460px, calc(100vh - 64px), 820px);   /* plan B sin svh */
    min-height: clamp(460px, calc(100svh - 64px), 820px);
    padding: 48px 0 64px;
    color: #fff;
    background:
        linear-gradient(90deg, rgba(8, 20, 38, .82) 0%, rgba(8, 20, 38, .6) 50%, rgba(8, 20, 38, .12) 100%),
        url("../images/hero.jpg") center 42% / cover no-repeat,
        #1d3b66;
}
.hero .wrap { width: 100%; }
.hero h1, .hero .lead { text-shadow: 0 1px 14px rgba(0, 0, 0, .35); }
.hero h1 {
    margin: 0 0 16px; max-width: 14em; color: #fff;
    font-size: clamp(2.25rem, 6vw, 4rem);
    line-height: 1.08;
    letter-spacing: -.02em;
}
.hero__kw {
    display: block; margin-top: .3em;
    font-size: .42em; font-weight: 400; letter-spacing: .12em;
    color: rgba(255, 255, 255, .92);
}
.hero .lead {
    margin: 0 0 28px; max-width: 32em; color: #fff;
    font-size: clamp(1.0625rem, 2vw, 1.25rem);
}

/* ---------- Secciones y cabecera de seccion (section-heading) ---------- */
.section { padding: 40px 0; }
.section-heading__title {
    margin: 0 0 24px;
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 400;
    letter-spacing: -.01em;
}
.intro p { max-width: 46em; color: var(--dark); font-size: 1.0625rem; }
.intro p:last-child { margin-bottom: 0; }

/* ---------- link-cards-section: lista numerada de categorias con flecha ---------- */
.link-cards {
    counter-reset: item;
    list-style: none; margin: 0; padding: 0;
    background: #fff; border: 1px solid var(--gray-300); border-radius: var(--radius);
    overflow: hidden;
}
.link-cards li { counter-increment: item; border-top: 1px solid var(--gray-300); }
.link-cards li:first-child { border-top: 0; }
.link-cards__item {
    display: flex; align-items: center; gap: 20px;
    padding: 24px 20px;
    color: var(--dark);
    transition: background-color .15s;
}
.link-cards__item::before {
    content: counter(item, decimal-leading-zero);
    min-width: 2ch; color: var(--primary); font-weight: 600;
}
.link-cards__item::after {
    margin-left: auto; width: 1.75rem; height: 1.75rem;
    transition: transform .15s, color .15s;
}
.link-cards__item:hover { background: var(--gray-100); color: var(--dark); }
.link-cards__item:hover::after { transform: translateX(4px); color: var(--primary); }
.link-cards__title { font-size: 1.125rem; }

/* ---------- cta-section: tarjeta blanca con texto y boton a la izquierda, imagen a la derecha ---------- */
.cta-card {
    display: grid; gap: 24px; align-items: center;
    grid-template-columns: minmax(0, 1fr);
    background: #fff; border-radius: var(--radius); padding: 24px;
}
.cta-card__title {
    margin: 0 0 .5em;
    font-size: clamp(1.5rem, 3.4vw, 2.125rem);
    font-weight: 400; letter-spacing: -.01em;
}
.cta-card__body p { max-width: 32em; margin-bottom: 1.5em; }
.cta-card__media img {
    width: 100%; aspect-ratio: 3 / 2; object-fit: cover;
    border: 1px solid var(--gray-300); border-radius: var(--radius);
}

/* ---------- Pie: logo arriba, copyright y enlaces legales abajo (como el sitio principal) ---------- */
.site-footer { background: #fff; border-top: 1px solid var(--gray-300); color: var(--dark); }
.footer-inner {
    display: flex; flex-direction: column; justify-content: space-between; gap: 40px;
    padding-top: 32px; padding-bottom: 24px;
}
.footer-top { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 20px; }
.footer-brand img { width: 110px; }
.footer-links,
.footer-legal { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 24px; }
.footer-bottom {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px;
    font-size: .875rem;
}
.footer-bottom p { margin: 0; }
.footer-legal a { text-decoration: underline; }

/* ---------- >= 640px ---------- */
@media (min-width: 640px) {
    .link-cards__item { padding: 28px 32px; gap: 28px; }
}

/* ---------- >= 900px: cabecera en dos filas, menu en linea ---------- */
@media (min-width: 900px) {
    .nav-burger { display: none; }
    .header-row { min-height: var(--header-h); }
    .brand img { width: 110px; }

    .header-menu {
        display: block;
        position: static; background: none; border: 0; box-shadow: none; padding: 0;
    }
    .site-nav ul { display: flex; align-items: center; gap: 4px; }
    .site-nav a { padding: 8px 14px; }
    .nav-util, .nav-cta { padding: 0 0 0 10px; }
    .site-nav .btn-primary { display: inline-flex; align-items: center; min-height: 40px; padding: 8px 24px; }

    .hero { min-height: clamp(520px, calc(100vh - var(--header-h)), 820px);   /* plan B sin svh */
            min-height: clamp(520px, calc(100svh - var(--header-h)), 820px); padding: 64px 0 80px; }
    .section { padding: 48px 0; }
    .cta-card { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 56px; padding: 24px 24px 24px 48px; }
    .footer-inner { min-height: 260px; }
}

/* ---------- Accesibilidad: menos movimiento ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; }
}

/* ======================================================================
   Paginas interiores: cabecera de pagina, productos, formulario, texto legal
   ====================================================================== */

/* ---------- Cabecera de pagina interior ---------- */
/* El titulo va directamente sobre el fondo de la pagina, como en el sitio principal (sin banda blanca) */
.page-heading { padding: 40px 0 0; }
.page-heading h1 {
    margin: 0;
    font-size: clamp(1.75rem, 3.6vw, 2.25rem);
    letter-spacing: -.02em;
    text-wrap: balance;
}
.page-heading + .section { padding-top: 24px; }

/* ---------- Productos: tarjeta blanca con imagen y texto ---------- */
.page-lead { margin: 0 0 24px; font-size: 1.125rem; }
.product-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.product-card {
    display: grid; gap: 20px; grid-template-columns: minmax(0, 1fr);
    background: #fff; border-radius: var(--radius); padding: 20px;
    scroll-margin-top: calc(var(--header-h) + 16px);
}
.product-card:target { outline: 2px solid var(--primary); }
.product-card__media img {
    width: 100%; aspect-ratio: 3 / 2; object-fit: cover;
    border: 1px solid var(--gray-300); border-radius: var(--radius);
}
.product-card__title { margin: 0 0 .6em; font-size: clamp(1.25rem, 2.6vw, 1.5rem); }
.product-card__body p { color: var(--gray-500); }
.product-card__body .btn { margin-top: .5em; }

/* ---------- Texto legal (prose) ---------- */
.prose-card { max-width: 62rem; margin: 0 auto; background: #fff; border-radius: var(--radius); padding: 28px 20px; }
.prose h2 { margin: 1.6em 0 .6em; font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.01em; }
.prose h3 { margin: 1.4em 0 .3em; font-size: 1.125rem; font-weight: 400; }
.prose p { margin: 0 0 1em; }
.prose > :first-child { margin-top: 0; }
.prose #introduccion { padding-bottom: 1em; border-bottom: 1px solid var(--gray-300); }

/* ---------- Formulario de contacto ---------- */
.form-card {
    display: grid; gap: 24px; grid-template-columns: minmax(0, 1fr);
    background: #fff; border-radius: var(--radius); padding: 24px;
}
.form-card__intro p { margin: 0 0 .6em; }
.form-grid {
    list-style: none; margin: 0; padding: 0;
    display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr);
}
.form-grid li { display: flex; flex-direction: column; gap: 6px; margin: 0; padding: 0; }
.form-grid label { font-weight: 600; font-size: .9375rem; }
.form-grid input[type="text"],
.form-grid textarea {
    width: 100%; padding: 12px 14px;
    border: 1px solid var(--border-soft); border-radius: var(--radius);
    background: #fff; color: var(--dark); font: inherit;
}
.form-grid textarea { min-height: 180px; resize: vertical; }
.form-grid input[type="text"]:focus,
.form-grid textarea:focus { outline: 3px solid rgba(0, 128, 201, .3); border-color: var(--primary); }
.form-grid li.error label { color: #dd380f; }
.form-grid li.error input[type="text"] { border-color: #dd380f; }
.form-grid li.privacidad { flex-direction: row; align-items: flex-start; gap: 10px; }
.form-grid li.privacidad.error a { color: #dd380f; }
.form-grid li.privacidad input { margin-top: .45em; }
.form-grid li.privacidad label { font-weight: 400; }
.form-grid .obligatorio { font-size: .875rem; color: var(--gray-500); margin-left: 12px; }
.form-grid .actions { flex-direction: row; align-items: center; }
.form-grid .btn { cursor: pointer; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.notice { border: 1px solid; border-radius: var(--radius); padding: 14px 20px; margin: 0 0 20px; }
.notice p { margin: 0; }
.notice--error { background: #fdecea; border-color: #dd380f; color: #8a1f08; }
.notice--ok { background: #e8f4fb; border-color: var(--primary); }

/* ---------- Datos de contacto ---------- */
.contact-info { margin-top: 20px; background: #fff; border-radius: var(--radius); padding: 24px; }
.contact-info h2 { margin: 0 0 .6em; font-size: 1.25rem; }
.contact-info address { font-style: normal; line-height: 1.9; }
.contact-info { display: grid; gap: 24px; grid-template-columns: minmax(0, 1fr); }
.contact-info__map a { display: block; }
.contact-info__map img {
    display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover;
    border: 1px solid var(--gray-300); border-radius: var(--radius); background: var(--gray-200);
}

@media (min-width: 640px) {
    .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .form-grid li.textarea,
    .form-grid li.privacidad,
    .form-grid li.actions { grid-column: 1 / -1; }
    .prose-card { padding: 40px 48px; }
}
@media (min-width: 900px) {
    .product-card { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 40px; padding: 24px; align-items: center; }
    .form-card { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 48px; padding: 40px; }
    .contact-info { padding: 32px 40px; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: 40px; align-items: start; }
}