/* BB Brothers — landing styles */
:root {
  --color-bg: #f8f9fa;
  --color-surface: #fff;
  --color-text: #1a1a1a;
  --color-text-muted: #5a5a5a;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --font-sans: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --max-width: 720px;
  --space: 1.5rem;
  --radius: 8px;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

/* Header */
.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space) 0;
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-accent);
}

.nav {
  display: flex;
  gap: 1.25rem;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

.nav a:hover {
  color: var(--color-accent);
}

/* Main */
.main {
  padding: 3rem 0;
}

.main--doc {
  padding-top: 2rem;
  padding-bottom: 3rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 0;
}

.hero__title {
  margin: 0 0 0.5rem;
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero__tagline {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

.hero__desc {
  margin: 0 0 1.75rem;
  max-width: 36ch;
  margin-left: auto;
  margin-right: auto;
  color: var(--color-text-muted);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}

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

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

/* About & Contact */
.about,
.contact {
  padding: 2.5rem 0;
}

.about h2,
.contact h2 {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.about p,
.contact p {
  margin: 0;
  color: var(--color-text-muted);
}

.contact {
  border-top: 1px solid var(--color-border);
}

/* Doc pages */
.doc h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.doc__updated {
  margin: 0 0 2rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.doc section {
  margin-bottom: 2rem;
}

.doc section:last-of-type {
  margin-bottom: 0;
}

.doc h2 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.doc p {
  margin: 0;
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  margin-top: auto;
  padding: var(--space) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

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

.footer__copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: 1.25rem;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer__links a:hover {
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    padding: 2.5rem 0;
  }

  .hero__title {
    font-size: 1.75rem;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
  }

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