/* ============================================
   GRAITH — graith.com.au
   AI-enabled C2 resilience for Defence
   ============================================ */

:root {
  /* Backgrounds */
  --bg-primary: #0A0F1A;
  --bg-secondary: #111827;
  --bg-card: #1A2332;

  /* Text */
  --text-primary: #E8E8E8;
  --text-secondary: #8B9BB4;

  /* Accent */
  --accent-primary: #00B4D8;
  --accent-secondary: #0E7490;

  /* Status */
  --alert-red: #E63946;
  --alert-amber: #F4A261;
  --success-green: #2A9D8F;

  /* Borders */
  --border: #1E293B;

  /* Typography */
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --content-max: 72rem;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  background: var(--accent-primary);
  color: var(--bg-primary);
  padding: var(--space-xs) var(--space-sm);
  font-weight: 600;
  z-index: 100;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus {
  top: 0;
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

h3 {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
}

.mono {
  font-family: var(--font-mono);
}

/* Layout */
.section {
  padding: var(--space-lg) var(--space-md);
}

.section-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

/* Divider between sections */
.section + .section {
  border-top: 1px solid var(--border);
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  padding: var(--space-sm) var(--space-md);
}

.site-header .section-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-wordmark {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.header-wordmark a {
  color: inherit;
}

.header-contact-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.header-contact-link:hover {
  color: var(--accent-primary);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  border-top: none;
}

.hero .section-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.hero-wordmark {
  display: inline-block;
  border-bottom: 2px solid var(--accent-primary);
  padding-bottom: var(--space-xs);
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.375rem);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 36rem;
}

/* ============================================
   CAPABILITIES (What We Do)
   ============================================ */
.capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.capability-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-md);
}

.capability-card h3 {
  color: var(--accent-primary);
}

.capability-card p {
  margin-bottom: 0;
}

.capability-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
  opacity: 0.7;
}

/* ============================================
   PROBLEM
   ============================================ */
.problem p {
  max-width: 48rem;
  font-size: 1.125rem;
  line-height: 1.8;
}

/* ============================================
   ARCHITECTURE
   ============================================ */
.architecture-diagram {
  margin: var(--space-md) 0;
  display: flex;
  justify-content: center;
}

.architecture-diagram svg {
  width: 100%;
  max-width: 56rem;
  height: auto;
}

.architecture-caption {
  max-width: 48rem;
  margin-top: var(--space-md);
}

/* ============================================
   ABOUT
   ============================================ */
.about p {
  max-width: 48rem;
}

.about-highlight {
  color: var(--text-primary);
  font-weight: 500;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.contact-item-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.contact-item-value {
  color: var(--text-primary);
  font-size: 1.125rem;
}

.contact-item-value a {
  color: var(--text-primary);
}

.contact-item-value a:hover {
  color: var(--accent-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.site-footer p:last-child {
  margin-bottom: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (min-width: 768px) {
  .section {
    padding: var(--space-lg) var(--space-md);
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .capabilities-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .section {
    padding: var(--space-lg) var(--space-lg);
  }

  .hero {
    padding: var(--space-xl) var(--space-lg);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}