/* ==========================================================================
   METSUR — Hoja de estilos
   Paleta: azul corporativo #004080, gris industrial, blanco, negro (texto)
   ========================================================================== */

:root {
  --color-primary: #004080;
  --color-primary-dark: #00305f;
  --color-primary-light: #1a5ca3;
  --color-accent: #e8871e;
  --color-ink: #14202b;
  --color-ink-soft: #46586a;
  --color-line: #dde4ea;
  --color-surface: #ffffff;
  --color-surface-alt: #f4f7fa;
  --color-industrial-gray: #6b7885;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;

  --container-w: 1180px;
  --radius: 10px;
  --shadow-sm: 0 1px 3px rgba(20, 32, 43, 0.08);
  --shadow-md: 0 8px 24px rgba(0, 64, 128, 0.12);
  --transition: 0.2s ease;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; color: var(--color-ink); }

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

ul { margin: 0; padding: 0; list-style: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn:active { transform: translateY(1px); }

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

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.6);
  color: inherit;
}
.hero .btn-outline { color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.12); }

.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.98);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
}

.logo-sub {
  font-weight: 500;
  font-size: 0.6rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-industrial-gray);
  padding-left: 10px;
  border-left: 1px solid var(--color-line);
}

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

.main-nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-ink);
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.main-nav a:hover { color: var(--color-primary); border-color: var(--color-primary); }

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 10px 20px !important;
  border-radius: 999px;
  border: none !important;
}
.nav-cta:hover { background: var(--color-primary-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 88px 0 64px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #a9c6e8;
  margin-bottom: 14px;
}

.hero h1 {
  color: #fff;
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  margin-bottom: 20px;
}

.hero-lead {
  color: #d7e5f5;
  font-size: 1.05rem;
  max-width: 54ch;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero-badges {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.badge-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.badge-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: #b9d1ec;
}

.badge-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--color-surface-alt); }

.section-eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

.section-lead {
  max-width: 68ch;
  font-size: 1.05rem;
  margin-bottom: 40px;
}

/* Service cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 48px;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
  transform: translateY(-3px);
}

.service-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-alt);
  border-radius: 10px;
  margin-bottom: 16px;
  color: var(--color-primary);
  transition: background var(--transition), color var(--transition);
}

.service-card:hover .service-icon {
  background: var(--color-primary);
  color: #fff;
}

.service-card h3 { font-size: 1.1rem; }
.service-card p { margin: 0; font-size: 0.95rem; }

.collab-note {
  background: var(--color-surface-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 24px 28px;
}
.collab-note h3 { font-size: 1.05rem; }
.collab-list { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 10px; }
.collab-list li { color: var(--color-ink-soft); font-size: 0.95rem; }

/* Acreditaciones */
.accred-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.accred-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 26px;
  border-top: 3px solid var(--color-primary);
}

.accred-tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 700;
  color: var(--color-primary);
  background: #e7eff8;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.accred-id { font-weight: 700; font-size: 1.05rem; color: var(--color-ink); margin-bottom: 8px; }

.normativa-note {
  margin-top: 32px;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
}

/* Nosotros */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: start;
}

.values-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
  color: var(--color-ink-soft);
}
.values-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

.about-panel {
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  padding: 30px;
  border: 1px solid var(--color-line);
}
.about-panel h3 { font-size: 1.05rem; margin-bottom: 18px; }

.spec-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.92rem;
}
.spec-list div:last-child { border-bottom: none; }
.spec-list dt { color: var(--color-ink-soft); }
.spec-list dd { margin: 0; font-weight: 600; text-align: right; }

/* Industrias */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.subhead { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.6px; color: var(--color-industrial-gray); }

.chip-group { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }

.chip {
  background: #fff;
  border: 1px solid var(--color-line);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--color-ink);
}

.chip-region {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Convertidor de unidades */
.converter-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 760px;
}

.converter-row {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
}

.converter-value { flex: 1 1 140px; }
.converter-unit { flex: 2 1 220px; }

.converter-row .form-row { margin-bottom: 0; }

.converter-swap {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  background: #fff;
  color: var(--color-primary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.converter-swap:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.converter-swap:active { transform: rotate(180deg); }

.converter-result {
  margin: 26px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
}

@media (max-width: 640px) {
  .converter-row { align-items: stretch; }
  .converter-swap { align-self: center; }
}

/* Contacto */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-list { margin: 26px 0; }
.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}
.contact-list a { text-decoration: none; color: var(--color-primary); font-weight: 600; }

.contact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--color-industrial-gray);
}

.map-embed {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  height: 260px;
}
.map-embed iframe { width: 100%; height: 100%; border: 0; }

.contact-form {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-form h3 { font-size: 1.15rem; margin-bottom: 22px; }

.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-ink);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  background: #fff;
  color: var(--color-ink);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,64,128,0.12);
}

.form-row input.invalid,
.form-row textarea.invalid { border-color: #c0392b; }

.field-error {
  display: block;
  color: #c0392b;
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 1em;
}

.form-note {
  margin: 14px 0 0;
  font-size: 0.9rem;
  min-height: 1.2em;
}
.form-note.success { color: #1e7d3a; }
.form-note.error { color: #c0392b; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: #c7d2dc;
  padding-top: 56px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo-wrap {
  display: inline-flex;
  align-items: center;
  background: #fff;
  padding: 8px 14px;
  border-radius: 8px;
}
.footer-logo-img { height: 30px; width: auto; display: block; }
.footer-brand p { color: #9aa8b5; margin: 4px 0 0; font-size: 0.9rem; }
.footer-fine { font-size: 0.8rem !important; margin-top: 10px !important; }

.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a { text-decoration: none; color: #c7d2dc; font-size: 0.92rem; }
.footer-nav a:hover { color: #fff; }

.footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-contact a { text-decoration: none; color: #c7d2dc; font-size: 0.92rem; }
.footer-contact a:hover { color: #fff; }

.footer-bottom {
  padding: 20px 24px;
  text-align: center;
  font-size: 0.82rem;
  color: #7c8996;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 90;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-primary-dark); }

/* ---------- Scroll-reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-badges { order: -1; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .accred-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
  .footer-inner { grid-template-columns: 1fr; gap: 26px; }
}

@media (max-width: 1100px) {
  .logo-sub { display: none; }

  .main-nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: #fff;
    transform: translateX(100%);
    transition: transform var(--transition);
    overflow-y: auto;
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 4px;
  }
  .main-nav a {
    display: block;
    padding: 14px 4px;
    border-bottom: 1px solid var(--color-line);
  }
  .nav-cta { text-align: center; margin-top: 10px; }
  .nav-toggle { display: flex; }
  .cards-grid { grid-template-columns: 1fr; }
  .hero-badges { grid-template-columns: 1fr 1fr; }
  .section { padding: 64px 0; }
}