/* =====================================================
   TOOL SHELL · Header/Footer común v2
   Laboratorio de Sistemas Porcícolas
   Cargar antes del CSS específico de cada herramienta.
   ===================================================== */

:root {
  --shell-brand: var(--brand, var(--accent, #0f3d36));
  --shell-brand-mid: #174d43;
  --shell-brand-dark: #0d2e29;
  --shell-brand-soft: var(--brand-soft, var(--accent-soft, #dcece6));
  --shell-text: #ffffff;
  --shell-text-soft: #dcece6;
  --shell-text-muted: #b8d7cb;
  --shell-line: rgba(255,255,255,0.14);
  --shell-radius: var(--radius, 18px);
  --shell-shadow: 0 14px 32px rgba(8, 31, 27, 0.22);
  --shell-container: 1440px;
}

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

html {
  scroll-behavior: smooth;
}

.container {
  width: min(var(--shell-container), calc(100% - clamp(34px, 6vw, 104px)));
  margin-inline: auto;
}

/* ===== Header común ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  color: var(--shell-text);
  background:
    radial-gradient(circle at 10% 0%, rgba(255,255,255,0.11), transparent 30%),
    linear-gradient(135deg, var(--shell-brand), var(--shell-brand-mid) 52%, var(--shell-brand-dark));
  border-bottom: 1px solid var(--shell-line);
  box-shadow: var(--shell-shadow);
  backdrop-filter: blur(12px);
  padding: 14px 0 13px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.4;
  transition:
    padding 190ms ease,
    box-shadow 190ms ease,
    background 190ms ease,
    border-color 190ms ease;
}

.header-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(16px, 2.2vw, 28px);
  align-items: center;
}

.site-header .brand-block {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 6px;
  color: #7a9b8f;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  font-weight: 850;
}

.site-header .eyebrow {
  color: var(--shell-text-muted);
  transition: font-size 190ms ease, margin 190ms ease, opacity 190ms ease;
}

.site-header .brand-block h1 {
  margin: 0 0 4px;
  color: var(--shell-text);
  font-size: clamp(32px, 3.7vw, 52px);
  line-height: 0.95;
  letter-spacing: -0.06em;
  text-wrap: balance;
  transition:
    font-size 190ms ease,
    letter-spacing 190ms ease,
    line-height 190ms ease,
    margin 190ms ease;
}

.site-header .subtitle {
  margin: 0;
  color: var(--shell-text-soft);
  font-size: 15.5px;
  line-height: 1.25;
  transition:
    font-size 190ms ease,
    opacity 190ms ease,
    transform 190ms ease;
}

.site-header .author-line {
  margin: 6px 0 0;
  color: var(--shell-text-soft);
  font-size: 13.75px;
  font-weight: 650;
  line-height: 1.25;
  transition:
    font-size 190ms ease,
    margin 190ms ease,
    opacity 190ms ease,
    transform 190ms ease;
}

.site-header .author-line a,
.site-footer a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.45);
}

.site-header .author-line a:hover,
.site-footer a:hover {
  border-bottom-color: currentColor;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}

.profile-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid rgba(255,255,255,0.26);
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  color: #fff;
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 850;
  white-space: nowrap;
  transition:
    min-height 190ms ease,
    padding 190ms ease,
    font-size 190ms ease,
    background 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.profile-button:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.38);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

.version-card {
  padding: 13px 18px;
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: var(--shell-radius);
  background: rgba(255,255,255,0.08);
  min-width: 142px;
  transition:
    padding 190ms ease,
    min-width 190ms ease,
    border-radius 190ms ease;
}

.version-card span {
  display: block;
  color: var(--shell-text-muted);
  font-size: 12.75px;
  margin-bottom: 4px;
  transition: font-size 190ms ease, margin 190ms ease;
}

.version-card strong {
  display: block;
  color: #fff;
  font-size: 17.5px;
  line-height: 1.1;
  transition: font-size 190ms ease;
}

/* Estado compacto al hacer scroll.
   Lo activa assets/js/tool-shell.js mediante .is-compact. */

.site-header.is-compact {
  padding: 6px 0;
  box-shadow: 0 10px 24px rgba(8, 31, 27, 0.24);
  border-bottom-color: rgba(255,255,255,0.10);
}

.site-header.is-compact .brand-block h1 {
  font-size: clamp(23px, 2.1vw, 32px);
  line-height: 0.94;
  letter-spacing: -0.05em;
  margin-bottom: 2px;
}

.site-header.is-compact .eyebrow {
  margin-bottom: 2px;
  font-size: 10px;
}

.site-header.is-compact .subtitle {
  font-size: 12px;
  opacity: 0.88;
  transform: translateY(-1px);
}

.site-header.is-compact .author-line {
  margin-top: 1px;
  font-size: 11px;
  opacity: 0.86;
  transform: translateY(-1px);
}

.site-header.is-compact .profile-button {
  min-height: 32px;
  padding: 7px 11px;
  font-size: 12px;
}

.site-header.is-compact .version-card {
  padding: 7px 11px;
  min-width: 104px;
  border-radius: 14px;
}

.site-header.is-compact .version-card span {
  font-size: 10px;
  margin-bottom: 0;
}

.site-header.is-compact .version-card strong {
  font-size: 13px;
}

/* ===== Footer común ===== */

.site-footer {
  margin-top: 18px;
  padding: 24px 0 28px;
  color: var(--shell-text-soft);
  background: linear-gradient(135deg, var(--shell-brand-dark), #143f38 55%, var(--shell-brand));
  border-top: 1px solid rgba(255,255,255,0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.42;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.2fr) minmax(260px, 1fr) minmax(260px, 1fr);
  gap: 14px;
  align-items: stretch;
}

.footer-brand,
.footer-card {
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  background: rgba(255,255,255,0.06);
  padding: 14px 15px;
}

.footer-brand .eyebrow {
  margin: 0 0 6px;
  color: var(--shell-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  font-weight: 850;
}

.footer-brand h2 {
  margin: 0 0 6px;
  color: #fff;
  font-size: 22px;
  line-height: 1.1;
}

.footer-brand p,
.footer-card p {
  margin: 6px 0 0;
  line-height: 1.42;
}

.footer-card strong {
  display: block;
  color: #fff;
  margin-bottom: 5px;
}

.footer-card em {
  color: #fff;
}

.site-footer a {
  color: #fff;
  font-weight: 900;
}

/* ===== Responsive común ===== */

@media (max-width: 1200px) {
  .container {
    width: min(100%, calc(100% - 46px));
  }
}

@media (max-width: 980px) {
  .header-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .site-header {
    padding: 10px 0;
  }

  .site-header .brand-block h1 {
    font-size: clamp(27px, 7vw, 39px);
  }

  .site-header.is-compact .brand-block h1 {
    font-size: clamp(22px, 6vw, 30px);
  }

  .site-header .subtitle,
  .site-header .author-line {
    font-size: 12.5px;
  }

  .container {
    width: min(100%, calc(100% - 28px));
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100%, calc(100% - 22px));
  }

  .site-header .brand-block h1 {
    font-size: 28px;
  }

  .profile-button {
    min-height: 40px;
    padding: 8px 11px;
    font-size: 13px;
  }

  .version-card {
    min-width: 112px;
    padding: 9px 12px;
  }

  .version-card span {
    font-size: 10.5px;
  }

  .version-card strong {
    font-size: 14px;
  }

  .site-footer {
    padding: 22px 0 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header *,
  .profile-button,
  .version-card,
  .version-card * {
    transition: none !important;
  }
}