/* BUSW — shared stylesheet. Dark-first, black/white/red. No framework, no build step. */

:root {
  --color-bg: #0a0a0a;
  --color-bg-alt: #141414;
  --color-fg: #f5f5f5;
  --color-fg-muted: #a3a3a3;
  --color-accent: #d7263d;
  --color-border: rgba(255, 255, 255, 0.15);

  /* Flight Companion's own identity — scoped to the Products page only */
  --color-bfc-start: #ffb020;
  --color-bfc-end: #ff7a1a;
  --color-bfc-text: #05070a;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --space-12: 96px;
  --space-16: 128px;

  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 28px;
  --text-2xl: 40px;
  --text-3xl: 64px;

  --radius: 3px;
  --container-max: 1200px;
  --transition-fast: 150ms ease;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --font-mono: "Cascadia Code", "SF Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-bg);
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2,
h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

a {
  color: inherit;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  z-index: 100;
  border-radius: var(--radius);
}

.skip-link:focus {
  left: var(--space-2);
  top: var(--space-2);
}

/* Focus states */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-weight: 700;
  font-size: var(--text-lg);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-fg);
  font-size: var(--text-base);
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-fg);
}

.nav-list {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--color-fg);
  border-bottom-color: var(--color-accent);
}

/* Sections */
.section {
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  margin-bottom: var(--space-6);
}

.eyebrow {
  display: block;
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.lede {
  color: var(--color-fg-muted);
  font-size: var(--text-lg);
  max-width: 640px;
  margin-top: var(--space-3);
}

.lede + .lede {
  margin-top: var(--space-4);
}

/* Hero */
.hero h1 {
  font-size: var(--text-3xl);
}

.hero .tagline {
  font-size: var(--text-xl);
  color: var(--color-fg-muted);
  margin-top: var(--space-2);
  max-width: 720px;
}

/* Buttons */
.btn {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

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

.btn-primary:hover {
  background: #b81f34;
  border-color: #b81f34;
}

.btn-secondary {
  background: transparent;
  color: var(--color-fg);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-fg);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* Cards */
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: var(--color-bg-alt);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-4);
}

/* Badge */
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 10px;
  color: var(--color-fg-muted);
}

/* Product (Flight Companion) — orange scoped here only */
.product-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-bfc-start), var(--color-bfc-end));
  color: var(--color-bfc-text);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-base);
}

.product-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.product-header .badge {
  margin-top: var(--space-1);
}

.feature-list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

.feature-list li::before {
  content: "—";
  color: var(--color-accent);
  margin-right: var(--space-1);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.screenshot-grid img {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.meta-list {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
}

/* Footer */
.site-footer {
  background: #000;
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  justify-content: space-between;
}

.footer-nav {
  display: flex;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav a {
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--color-fg);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
}

/* Scroll reveal (progressive enhancement, disabled under reduced motion) */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms ease, transform 400ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  * {
    transition-duration: 0.001ms !important;
  }
}

/* Responsive */
@media (max-width: 640px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-3);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li {
    padding: var(--space-1) 0;
  }

  .site-header {
    position: relative;
  }

  .hero h1 {
    font-size: var(--text-2xl);
  }

  .hero .tagline {
    font-size: var(--text-lg);
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}