/* =============================================================
   SAT INDUSTRIAL LIMITED — Design Tokens & Shared Styles
   Palette D: Warm Grey-White + Carbon Black + Signal Red
   ============================================================= */

:root {
  --color-primary: #1C1917;
  --color-primary-dark: #0C0A09;
  --color-accent: #DC2626;
  --color-bg: #F5F5F4;
  --color-surface: #FFFFFF;
  --color-text: #292524;
  --color-text-muted: #6B7280;
  --color-border: #E7E5E4;
  --radius-card: 0.5rem;
  --shadow-card: 0 1px 3px rgba(28, 25, 23, 0.08), 0 8px 24px rgba(28, 25, 23, 0.06);
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header / Navigation ---------- */

.site-header {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-dropdown {
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
}

.group\/nav:hover .nav-dropdown,
.group\/nav:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.2s ease;
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* ---------- Mobile accordion menu ---------- */

.mobile-submenu {
  display: none;
}

.mobile-submenu.open {
  display: block;
}

/* ---------- Cards ---------- */

.sf-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.sf-card:hover {
  transform: translateY(-4px);
  border-color: rgba(28, 25, 23, 0.3);
  box-shadow: 0 4px 6px rgba(28, 25, 23, 0.08), 0 16px 40px rgba(28, 25, 23, 0.12);
}

/* ---------- Section helpers ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 2px;
  background: var(--color-accent);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* ---------- Steps ---------- */

.step-num {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(220, 38, 38, 0.9);
  letter-spacing: -0.02em;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.75rem;
  border-radius: var(--radius-card);
  font-weight: 700;
  font-size: 0.9375rem;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}

.btn-accent:hover {
  background: #B91C1C;
}

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

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

.btn-outline-light {
  border: 2px solid rgba(255, 255, 255, 0.7);
  color: #fff;
}

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

/* ---------- FAQ details (shared across pages) ---------- */

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .faq-body {
  padding: 0 1.25rem 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ---------- Accessibility ---------- */

:focus-visible {
  outline: 3px solid rgba(220, 38, 38, 0.55);
  outline-offset: 2px;
}

/* ---------- Hero video fallback ---------- */

.hero-video-failed [data-hero-video] {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .sf-card,
  .btn,
  .nav-dropdown {
    transition: none;
  }
  [data-hero-video] {
    display: none;
  }
}