/* ==========================================================================
   SAI SYSTEMS — Stylesheet
   Design tokens: deep navy / steel blue / white / light grey / muted amber
   ========================================================================== */

:root {
  --navy: #0b1e3a;
  --navy-2: #10294f;
  --blue: #2c5aa0;
  --blue-dark: #1e4278;
  --white: #ffffff;
  --grey-100: #f4f6f9;
  --grey-200: #e6eaf0;
  --grey-400: #aab4c2;
  --slate: #1e2a38;
  --slate-soft: #4a5568;
  --amber: #c98a3e;
  --amber-soft: #f3e3cd;

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 3px rgba(11, 30, 58, 0.08);
  --shadow-md: 0 8px 24px rgba(11, 30, 58, 0.12);
  --container: 1180px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--slate);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--navy);
  letter-spacing: -0.01em;
}
p { margin: 0 0 1em; }
button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 88px 0;
}
.section--tight { padding: 64px 0; }
.section--grey { background: var(--grey-100); }
.section--navy { background: var(--navy); color: var(--grey-200); }
.section--navy h2, .section--navy h3 { color: var(--white); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.section--navy .eyebrow { color: var(--amber); }
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.section-head {
  max-width: 640px;
  margin-bottom: 48px;
}
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
.section-head p { color: var(--slate-soft); font-size: 1.05rem; }
.section--navy .section-head p { color: var(--grey-400); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--amber);
  color: var(--navy);
}
.btn-primary:hover { background: #d99847; }
.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.4);
  color: var(--white);
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.06); }
.btn-outline-dark {
  background: transparent;
  border-color: var(--navy);
  color: var(--navy);
}
.btn-outline-dark:hover { background: var(--navy); color: var(--white); }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 30, 58, 0.97);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
}
.brand-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.brand-text span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--grey-400);
  text-transform: uppercase;
}

.main-nav ul {
  display: flex;
  gap: 32px;
  align-items: center;
}
.main-nav a {
  color: var(--grey-200);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 2px;
  position: relative;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.main-nav a:hover::after,
.main-nav a:focus-visible::after { transform: scaleX(1); }
.nav-cta { display: none; }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--navy-2);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .main-nav.is-open { max-height: 400px; }
  .main-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
  }
  .main-nav li { width: 100%; }
  .main-nav a { display: block; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-toggle { display: flex; }
}
@media (min-width: 861px) {
  .main-nav ul { flex-wrap: nowrap; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
  color: var(--white);
  overflow: hidden;
  padding: 96px 0 110px;
}
.hero-scan {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  pointer-events: none;
}
.scan-sweep {
  transform-origin: 0 0;
  animation: sweep 6s linear infinite;
}
@keyframes sweep {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
  .scan-sweep { animation: none; }
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 999px;
  color: var(--grey-200);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #5fd18b;
  box-shadow: 0 0 0 3px rgba(95, 209, 139, 0.2);
}
.hero h1 {
  color: var(--white);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin-bottom: 20px;
}
.hero .lede {
  font-size: 1.15rem;
  color: var(--grey-200);
  max-width: 560px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: start;
}
.about-copy p { color: var(--slate-soft); font-size: 1.05rem; }
.fact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--grey-200);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.fact {
  background: var(--white);
  padding: 22px 20px;
}
.fact-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate-soft);
  margin-bottom: 6px;
}
.fact-value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--navy);
}

/* ---------- Services ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue);
}
.service-icon {
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  color: var(--blue);
}
.service-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.service-card p { color: var(--slate-soft); font-size: 0.95rem; margin-bottom: 14px; }
.service-card ul { display: flex; flex-direction: column; gap: 6px; }
.service-card li {
  font-size: 0.88rem;
  color: var(--slate-soft);
  padding-left: 18px;
  position: relative;
}
.service-card li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 6px; height: 6px;
  background: var(--amber);
  border-radius: 1px;
}

/* ---------- Why choose ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}
.why-item {
  display: flex;
  gap: 16px;
}
.why-icon {
  width: 40px; height: 40px;
  flex-shrink: 0;
  color: var(--amber);
}
.why-item h3 { font-size: 1.02rem; margin-bottom: 6px; color: var(--white); }
.why-item p { color: var(--grey-400); font-size: 0.92rem; margin: 0; }

/* ---------- Testing services (planned expansion) ---------- */
.testing-panel {
  background: var(--grey-100);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-lg);
  padding: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.testing-panel .status-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--amber-soft);
  color: #7a5220;
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.testing-panel .status-tag .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #b9791f;
}
.testing-panel h2 { font-size: clamp(1.4rem, 2.6vw, 1.8rem); }
.testing-panel p { color: var(--slate-soft); }
.disclaimer-box {
  background: var(--white);
  border: 1.5px solid var(--amber);
  border-radius: var(--radius);
  padding: 22px 24px;
  align-self: start;
}
.disclaimer-box .disclaimer-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
  display: block;
}
.disclaimer-box p {
  font-size: 0.92rem;
  color: var(--slate);
  margin: 0;
}
.testing-location {
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--slate-soft);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 26px;
  margin-top: 28px;
}
.contact-info-item {
  display: flex;
  gap: 16px;
}
.contact-info-icon {
  width: 38px; height: 38px;
  flex-shrink: 0;
  color: var(--blue);
}
.contact-info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.contact-info-item p { color: var(--slate-soft); margin: 0; font-size: 0.95rem; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--grey-200);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--slate);
  background: var(--white);
  transition: border-color 0.15s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  outline: none;
}
.form-group textarea { resize: vertical; min-height: 110px; }
.field-error {
  font-size: 0.8rem;
  color: #b3261e;
  margin-top: 5px;
  display: none;
}
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: #b3261e;
}
.form-group.has-error .field-error { display: block; }
.form-note {
  font-size: 0.82rem;
  color: var(--slate-soft);
  margin-top: 14px;
}
.form-status {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.is-success { background: #e6f4ea; color: #1e6b34; }
.form-status.is-info { background: var(--grey-100); color: var(--slate-soft); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy);
  color: var(--grey-400);
  padding: 56px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { font-size: 0.9rem; color: var(--grey-400); max-width: 320px; }
.footer-col h4 {
  color: var(--white);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 0.92rem; color: var(--grey-400); }
.footer-col a:hover { color: var(--white); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 0.82rem;
}

@media (max-width: 900px) {
  .about-grid,
  .contact-grid,
  .testing-panel,
  .form-row,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid { gap: 32px; }
}

/* ---------- Utility page (privacy/terms) ---------- */
.legal-content {
  max-width: 760px;
  margin: 0 auto;
}
.legal-content h2 { margin-top: 2em; }
.legal-content p, .legal-content li { color: var(--slate-soft); }
.legal-content ul { list-style: disc; padding-left: 1.4em; margin-bottom: 1em; }
.legal-updated {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--slate-soft);
  margin-bottom: 40px;
  display: block;
}