/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Variables — based on Dragon PBX logo colours */
:root {
  --color-bg: #ffffff;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-blue: #1273a9;
  --color-blue-dark: #003b63;
  --color-blue-light: #e8f0fc;
  --color-red: #e0443d;
  --color-red-dark: #a5311f;
  --color-border: #e2e8f0;
  --color-code-bg: #f1f5f9;
  --color-nav-bg: #003b63;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
  --max-width: 960px;
}

/* Base */
html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--color-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Navigation */
.site-nav {
  background: #f6f1e4;
  padding: 0.75rem 0;
  border-bottom: 3px solid var(--color-nav-bg);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo:hover {
  text-decoration: none;
}

.logo img {
  display: block;
  border-radius: 4px;
}



.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  transition: color 0.15s;
  font-weight: 800;
  color: var(--color-blue-dark);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-blue);
  text-decoration: none;
}

/* Main content */
main {
  min-height: calc(100vh - 140px);
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
  color: var(--color-nav-bg);
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-light);
  max-width: 640px;
}

.hero .cta-links {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}

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

.btn-primary:hover {
  background: var(--color-blue-dark);
  text-decoration: none;
}

.btn-secondary {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  text-decoration: none;
}

/* Page sections */
.page-header {
  padding: 3rem 0 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-nav-bg);
}

.page-header p {
  color: var(--color-text-light);
  margin-top: 0.5rem;
  font-size: 1.05rem;
}

.content {
  padding: 2rem 0 3rem;
}

.content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.3px;
  color: var(--color-blue-dark);
}

.content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.content p {
  margin-bottom: 1rem;
  color: var(--color-text);
}

.content ul, .content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.4rem;
}

.content code {
  background: var(--color-code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--color-blue-dark);
}

.content pre {
  background: var(--color-code-bg);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border-left: 3px solid var(--color-blue);
}

.content pre code {
  background: none;
  padding: 0;
  color: var(--color-text);
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.feature-card {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  border-top: 3px solid var(--color-blue);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-nav-bg);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin: 0;
}

/* Diagram / code block */
.diagram {
  background: var(--color-nav-bg);
  color: #cbd5e1;
  padding: 1.5rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
  margin: 1.5rem 0;
}

/* Licensing tiers */
.license-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.license-card {
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  border-top: 3px solid var(--color-blue);
}

.license-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-nav-bg);
}

.license-card .price {
  font-size: 1.1rem;
  color: var(--color-red);
  font-weight: 600;
  margin-bottom: 1rem;
}

.license-card ul {
  list-style: none;
  padding: 0;
}

.license-card li {
  padding: 0.3rem 0;
  font-size: 0.95rem;
  color: var(--color-text-light);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  text-align: center;
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 640px) {
  .nav-links {
    gap: 1rem;
    font-size: 0.85rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .feature-grid,
  .license-grid {
    grid-template-columns: 1fr;
  }
}