/* ============================================================
   ALLIANCE MINING — Hoja de estilos principal
   Paleta derivada de la identidad corporativa ALLIANCE
   (azul marino institucional) + acentos minerales (cobre/teal)
   ============================================================ */

:root {
  /* Paleta corporativa */
  --am-navy: #0B2340;
  --am-navy-dark: #071729;
  --am-navy-light: #14345c;
  --am-teal: #1B7A78;
  --am-teal-light: #2FA6A0;
  --am-copper: #B5652D;
  --am-copper-light: #D98C4A;
  --am-stone: #4A4F57;
  --am-bg: #F7F8FA;
  --am-white: #FFFFFF;
  --am-text: #1C2530;
  --am-text-soft: #5A6472;
  --am-border: #E1E5EA;

  --am-font-heading: 'Poppins', 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  --am-font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;

  --am-radius: 6px;
  --am-shadow: 0 8px 24px rgba(11, 35, 64, 0.10);
  --am-shadow-lg: 0 16px 48px rgba(11, 35, 64, 0.16);
  --am-container: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--am-font-body);
  color: var(--am-text);
  background: var(--am-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--am-font-heading);
  color: var(--am-navy);
  line-height: 1.25;
  margin: 0 0 0.6em 0;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 600; }
h3 { font-size: 1.3rem; font-weight: 600; }

p { margin: 0 0 1em 0; color: var(--am-text-soft); }

a { color: var(--am-teal); text-decoration: none; }
a:hover { color: var(--am-teal-light); }

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

.container {
  max-width: var(--am-container);
  margin: 0 auto;
  padding: 0 24px;
}

/* Accesibilidad: foco visible con teclado */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--am-copper-light);
  outline-offset: 2px;
}
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--am-navy);
  color: #fff;
  padding: 10px 16px;
  z-index: 1000;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* ------------------------------------------------------------
   HEADER
   ------------------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: var(--am-white);
  border-bottom: 1px solid var(--am-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand img {
  height: 38px;
  width: auto;
}

.brand-wordmark {
  font-family: var(--am-font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--am-teal);
  letter-spacing: 0.04em;
  white-space: nowrap;
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  color: var(--am-navy);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--am-teal);
  border-color: var(--am-teal);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--am-navy);
  margin: 5px 0;
  transition: all .2s ease;
}

/* ------------------------------------------------------------
   SELECTOR DE IDIOMA — Español | English | 简体中文
   ------------------------------------------------------------ */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  flex: none;
}
.lang-switcher a {
  color: var(--am-text-soft);
  padding: 5px 8px;
  border-radius: 4px;
  font-weight: 500;
  white-space: nowrap;
}
.lang-switcher a:hover { color: var(--am-navy); background: rgba(11,35,64,0.06); }
.lang-switcher a.active {
  color: #fff;
  background: var(--am-navy);
  font-weight: 600;
}
.lang-switcher .sep { color: var(--am-border); }

/* ------------------------------------------------------------
   CANALES DE CONTACTO DIRECTO (WhatsApp / llamada / SMS / WeChat)
   ------------------------------------------------------------ */
.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}
.contact-channel-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: #25D366;
  color: #fff;
  font-family: var(--am-font-heading);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 14px 22px;
  border-radius: var(--am-radius);
  text-decoration: none;
  transition: transform .15s ease, background .2s ease;
}
.contact-channel-primary:hover { background: #1ebe58; color: #fff; transform: translateY(-2px); }
.contact-channel-primary.is-wechat { background: #07C160; }
.contact-channel-primary.is-wechat:hover { background: #05a552; }
.contact-secondary-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.contact-secondary-actions a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--am-border);
  color: var(--am-navy);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 10px 16px;
  border-radius: var(--am-radius);
  text-decoration: none;
  transition: background .2s ease;
}
.contact-secondary-actions a:hover { background: rgba(11,35,64,0.06); }
.contact-note {
  font-size: 0.82rem;
  color: var(--am-text-soft);
  margin: 0;
}

/* ------------------------------------------------------------
   MODAL WECHAT — muestra el QR original ampliado
   ------------------------------------------------------------ */
dialog.wechat-modal {
  border: none;
  border-radius: var(--am-radius);
  padding: 28px;
  max-width: 360px;
  width: 90%;
  box-shadow: var(--am-shadow-lg);
}
dialog.wechat-modal::backdrop { background: rgba(7,23,41,0.72); }
.wechat-modal h3 { margin-bottom: 6px; }
.wechat-modal p { font-size: 0.9rem; margin-bottom: 14px; }
.wechat-modal img {
  width: 100%;
  max-width: 280px;
  margin: 0 auto 16px;
  border: 1px solid var(--am-border);
  border-radius: 4px;
}
.wechat-modal-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.wechat-modal-close {
  display: block;
  margin: 18px auto 0;
  background: none;
  border: none;
  color: var(--am-text-soft);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
}

/* ------------------------------------------------------------
   BOTONES
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--am-radius);
  font-family: var(--am-font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--am-copper);
  color: #fff;
}
.btn-primary:hover { background: var(--am-copper-light); color: #fff; }

.btn-secondary {
  background: transparent;
  border-color: var(--am-white);
  color: var(--am-white);
}
.btn-secondary:hover { background: rgba(255,255,255,0.12); color: #fff; }

.btn-outline-navy {
  background: transparent;
  border-color: var(--am-navy);
  color: var(--am-navy);
}
.btn-outline-navy:hover { background: var(--am-navy); color: #fff; }

.btn-block { width: 100%; }

.btn.is-disabled {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}
.btn.is-disabled:hover { transform: none; }

/* ------------------------------------------------------------
   HERO
   ------------------------------------------------------------ */
.hero {
  position: relative;
  color: #fff;
  background: linear-gradient(180deg, rgba(7,23,41,0.86), rgba(7,23,41,0.72)), var(--am-navy);
  background-size: cover;
  background-position: center;
  padding: 130px 0 100px;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(5,14,26,0.86) 0%, rgba(7,23,41,0.68) 42%, rgba(11,35,64,0.38) 78%, rgba(11,35,64,0.30) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--am-copper-light);
  margin-bottom: 18px;
}
/* Frase introductoria de portada (una por idioma): requiere máximo
   contraste sólido sobre fotografía, a diferencia de los eyebrows
   cortos de sección que usan el estilo por defecto de arriba. */
.hero-tagline {
  color: #fff;
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  text-shadow: 0 1px 3px rgba(0,0,0,0.35);
}

.hero h1 {
  color: #fff;
  margin-bottom: 22px;
}

.hero p.lead {
  color: rgba(255,255,255,0.88);
  font-size: 1.15rem;
  max-width: 620px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ------------------------------------------------------------
   SECCIONES GENERALES
   ------------------------------------------------------------ */
.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--am-white);
}
.section-navy {
  background: var(--am-navy);
  color: rgba(255,255,255,0.92);
}
.section-navy h2,
.section-navy h3 { color: #fff; }
.section-navy p { color: rgba(255,255,255,0.78); }

.section-header {
  max-width: 760px;
  margin: 0 0 48px 0;
}

.section-header.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--am-teal);
  margin-bottom: 12px;
}

/* ------------------------------------------------------------
   GRID / CARDS
   ------------------------------------------------------------ */
.grid {
  display: grid;
  gap: 28px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--am-white);
  border: 1px solid var(--am-border);
  border-radius: var(--am-radius);
  padding: 28px;
  box-shadow: var(--am-shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--am-shadow-lg);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(27,122,120,0.10);
  color: var(--am-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
}

.card h3 { margin-bottom: 10px; }
.card p { margin-bottom: 0; font-size: 0.95rem; }

/* Split image/text */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split img {
  border-radius: var(--am-radius);
  box-shadow: var(--am-shadow-lg);
  width: 100%;
  height: auto;
  object-fit: cover;
}
.split-reverse { direction: rtl; }
.split-reverse > * { direction: ltr; }

/* Lista de pasos numerados */
.steps {
  display: grid;
  gap: 20px;
}
.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--am-white);
  border: 1px solid var(--am-border);
  border-radius: var(--am-radius);
  padding: 22px 26px;
}
.step-num {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--am-navy);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--am-font-heading);
}
.step h3 { margin-bottom: 6px; font-size: 1.05rem; }
.step p { margin: 0; font-size: 0.94rem; }

.disclaimer {
  font-size: 0.86rem;
  color: var(--am-text-soft);
  background: rgba(27,122,120,0.06);
  border-left: 3px solid var(--am-teal);
  padding: 14px 18px;
  border-radius: 4px;
  margin-top: 24px;
}

/* Audiencias / formas de participar */
.audience-card {
  background: var(--am-white);
  border: 1px solid var(--am-border);
  border-radius: var(--am-radius);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--am-shadow);
}
.audience-card .card-icon { background: rgba(181,101,45,0.10); color: var(--am-copper); }
.audience-card .btn { margin-top: auto; align-self: flex-start; }

/* Ecosistema — tarjetas con logos de proporción original (sin deformar) */
.eco-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--am-radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}
/* Zona de logo con altura fija para alinear todas las tarjetas entre sí,
   sin forzar el ancho del logo: cada imagen conserva su proporción real. */
.eco-logo {
  height: 46px;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 4px;
}
.eco-card img {
  max-height: 100%;
  max-width: 100%;
  width: auto;
  height: auto;
  align-self: center;
  object-fit: contain;
  filter: brightness(0) invert(1);
}
.eco-card h3 { color: #fff; }
.eco-card p { color: rgba(255,255,255,0.75); font-size: 0.92rem; margin-bottom: 8px; flex-grow: 1; }
.eco-card a { color: var(--am-copper-light); font-weight: 600; font-size: 0.9rem; margin-top: auto; }
.eco-card .eco-name-only {
  font-family: var(--am-font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

/* Alliance Mining Connect — módulo breve de acceso al evento externo */
.upcoming-card {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 0;
  background: var(--am-white);
  border: 1px solid var(--am-border);
  border-radius: var(--am-radius);
  overflow: hidden;
  box-shadow: var(--am-shadow);
}
.upcoming-card img { height: 100%; object-fit: cover; }
.upcoming-card-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: center;
}

/* ------------------------------------------------------------
   CONTACTO
   ------------------------------------------------------------ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.contact-info-card {
  background: var(--am-white);
  border: 1px solid var(--am-border);
  border-radius: var(--am-radius);
  padding: 30px;
  box-shadow: var(--am-shadow);
}
.contact-info-card h3 { margin-bottom: 16px; }
.contact-line {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 16px;
  font-size: 0.95rem;
}
.contact-line strong { color: var(--am-navy); display:block; font-size:0.85rem; text-transform:uppercase; letter-spacing:.04em; margin-bottom:2px;}

.motive-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 22px;
}
.motive-chip {
  background: rgba(27,122,120,0.08);
  border: 1px solid rgba(27,122,120,0.25);
  color: var(--am-teal);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}
.motive-chip.active,
.motive-chip:hover {
  background: var(--am-teal);
  color: #fff;
}

/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */
.site-footer {
  background: var(--am-navy-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-legal-note {
  margin-top: 22px;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.42);
  line-height: 1.6;
  max-width: 760px;
}
.footer-brand img { height: 34px; margin-bottom: 14px; filter: brightness(0) invert(1); }
.footer-brand p { color: rgba(255,255,255,0.6); font-size: 0.9rem; max-width: 320px; }
.footer-col h4 {
  color: #fff;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.65);
  font-size: 0.92rem;
  margin-bottom: 10px;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }

/* ------------------------------------------------------------
   BANNER — Alliance Mining Connect (visibilidad en todas las páginas)
   ------------------------------------------------------------ */
.promo-banner {
  background: var(--am-copper);
}
.promo-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 11px 24px;
  font-size: 0.88rem;
  color: #fff;
}
.promo-banner-inner span i { margin-right: 8px; }
.promo-banner-link {
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.promo-banner-link:hover { color: #fff; text-decoration: underline; }

/* ------------------------------------------------------------
   RESPONSIVE
   ------------------------------------------------------------ */
@media (max-width: 991px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split-reverse { direction: ltr; }
  .contact-grid { grid-template-columns: 1fr; }
  .upcoming-card { grid-template-columns: 1fr; }
  .upcoming-card img { height: 220px; }
}

@media (max-width: 1080px) {
  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--am-white);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--am-border);
    box-shadow: var(--am-shadow);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: all .2s ease;
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav a { width: 100%; padding: 10px 0; }
  .nav-toggle { display: block; }
  .brand-wordmark { font-size: 0.88rem; }
  .hero { padding: 96px 0 70px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .promo-banner-inner { flex-direction: column; align-items: flex-start; text-align: left; padding: 12px 20px; }
  .lang-switcher { font-size: 0.75rem; }
  .lang-switcher a { padding: 4px 6px; }
  .contact-secondary-actions { flex-direction: column; }
  .contact-secondary-actions a { justify-content: center; }
}