/* First Principles Aerospace — landing page styles */

:root {
  --ink: #0B1E3F;
  --ink-soft: #2B3A56;
  --blue: #0B6FF2;
  --blue-dark: #0954BE;
  --bg: #FFFFFF;
  --bg-soft: #F4F7FC;
  --navy-deep: #021536;
  --rule: #E3E9F3;

  --font-sans: -apple-system, BlinkMacSystemFont, "Century Gothic", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, serif;

  --content-width: 720px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-soft);
  font-family: var(--font-serif);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

/* Accessibility utilities */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  border-radius: 6px;
  z-index: 100;
  transition: top 0.15s ease;
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.skip-link:focus {
  top: 12px;
}

a { color: var(--blue); }

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

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

.logo {
  height: 40px;
  width: auto;
}

.header-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  padding: 8px 4px;
}

.header-link:hover {
  color: var(--blue);
}

/* Hero */

.hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 80px;
  background-image:
    linear-gradient(rgba(11, 30, 63, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 30, 63, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: center top;
}

.hero-watermark {
  position: absolute;
  top: -40px;
  right: -60px;
  width: 420px;
  height: auto;
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}

.hero .wrap {
  position: relative;
  z-index: 1;
}

h1 {
  font-family: var(--font-sans);
  color: var(--ink);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: clamp(1.9rem, 4.5vw + 1rem, 2.75rem);
  line-height: 1.15;
  margin: 0 0 28px;
}

.lead {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 1vw + 1.05rem, 1.4rem);
  color: var(--ink);
  font-weight: 700;
  margin: 0 0 22px;
  line-height: 1.5;
}

.hero p {
  font-size: 1.0625rem;
  margin: 0 0 22px;
}

.attribution {
  border-left: 3px solid var(--blue);
  padding: 4px 0 4px 18px;
  color: var(--ink);
  font-style: italic;
}

.closing {
  font-size: 1.2rem;
  color: var(--ink);
  font-style: italic;
  margin-top: 34px;
}

.cta-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  margin-top: 36px;
}

.btn-primary {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: #fff;
  background: var(--blue);
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 1rem;
  transition: background-color 0.15s ease;
}

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

.contact-link {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
}

.contact-link:hover {
  color: var(--blue);
}

/* Footer */

.site-footer {
  background: var(--navy-deep);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-logo {
  height: 46px;
  width: auto;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

.footer-meta a {
  color: #fff;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.35);
  text-underline-offset: 3px;
}

.footer-meta a:hover {
  color: var(--blue);
}

.footer-copy {
  color: rgba(255, 255, 255, 0.6);
}

/* Tablet and up */
@media (min-width: 640px) {
  .cta-row {
    flex-direction: row;
    align-items: center;
    gap: 24px;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer-meta {
    align-items: flex-end;
  }
}

/* Desktop */
@media (min-width: 960px) {
  .hero {
    padding: 96px 0 120px;
  }

  .hero-watermark {
    width: 520px;
    top: -60px;
    right: -80px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}