/**
 * DigitConnection UI Platform - Design System
 * Academic Data Platform | Our World in Data / FT Visual inspired
 * DO NOT modify /jwm/ - this file applies to all sites EXCEPT jwm
 */

/* ============================================================
   Design Tokens (Spec v1)
   ============================================================ */
:root {
  /* Colors */
  --dc-primary: #2563eb;
  --dc-primary-hover: #1d4ed8;
  --dc-text: #1f2937;
  --dc-text-secondary: #4b5563;
  --dc-text-muted: #6b7280;
  --dc-bg: #ffffff;
  --dc-bg-alt: #f3f4f6;
  --dc-accent-orange: #ea580c;
  --dc-accent-green: #16a34a;
  --dc-border: #e5e7eb;
  --dc-border-light: #f3f4f6;

  /* Typography */
  --dc-font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --dc-font-body: 'Source Serif 4', 'Source Serif', Georgia, 'Noto Serif SC', serif;
  --dc-font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  --dc-h1: 42px;
  --dc-h2: 32px;
  --dc-h3: 24px;
  --dc-body: 18px;
  --dc-caption: 14px;

  /* Layout */
  --dc-max-width: 1100px;
  --dc-radius: 8px;
  --dc-radius-lg: 12px;
}

/* ============================================================
   Base & Typography
   ============================================================ */
body.dc-platform {
  font-family: var(--dc-font-body);
  font-size: var(--dc-body);
  color: var(--dc-text);
  background: var(--dc-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.dc-platform h1, .dc-platform .dc-h1 {
  font-family: var(--dc-font-heading);
  font-size: var(--dc-h1);
  font-weight: 700;
  color: var(--dc-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.dc-platform h2, .dc-platform .dc-h2 {
  font-family: var(--dc-font-heading);
  font-size: var(--dc-h2);
  font-weight: 600;
  color: var(--dc-text);
}

.dc-platform h3, .dc-platform .dc-h3 {
  font-family: var(--dc-font-heading);
  font-size: var(--dc-h3);
  font-weight: 600;
}

.dc-platform .dc-mono,
.dc-platform [data-numeric] {
  font-family: var(--dc-font-mono);
  font-variant-numeric: tabular-nums;
}

.dc-platform .dc-caption {
  font-size: var(--dc-caption);
  color: var(--dc-text-muted);
}

/* ============================================================
   Layout
   ============================================================ */
.dc-container {
  max-width: var(--dc-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 768px) {
  .dc-container { padding-left: 2rem; padding-right: 2rem; }
}

/* ============================================================
   Navbar
   ============================================================ */
.dc-navbar {
  background: var(--dc-bg);
  border-bottom: 1px solid var(--dc-border);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
}

.dc-navbar-inner {
  max-width: var(--dc-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.dc-navbar-brand {
  font-family: var(--dc-font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--dc-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dc-navbar-brand:hover { color: var(--dc-primary); }

.dc-navbar-brand .dc-primary-dot {
  color: var(--dc-primary);
}

.dc-navbar-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.dc-nav-link {
  font-family: var(--dc-font-heading);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--dc-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.dc-nav-link:hover { color: var(--dc-primary); }
.dc-nav-link.active { color: var(--dc-primary); font-weight: 600; }

/* ============================================================
   Cards
   ============================================================ */
.dc-card {
  background: var(--dc-bg);
  border: 1px solid var(--dc-border);
  border-radius: var(--dc-radius-lg);
  padding: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.dc-card:hover {
  border-color: var(--dc-primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.dc-card-alt {
  background: var(--dc-bg-alt);
}

/* ============================================================
   Footer
   ============================================================ */
.dc-footer {
  background: var(--dc-text);
  color: var(--dc-bg-alt);
  padding: 3rem 0;
  margin-top: 4rem;
  font-family: var(--dc-font-heading);
  font-size: var(--dc-caption);
}

.dc-footer-inner {
  max-width: var(--dc-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}

.dc-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: white;
  font-weight: 700;
  margin-bottom: 1rem;
}

.dc-footer-copy {
  opacity: 0.7;
}

/* ============================================================
   Links & Buttons
   ============================================================ */
.dc-link {
  color: var(--dc-primary);
  text-decoration: none;
}

.dc-link:hover { text-decoration: underline; }

.dc-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: var(--dc-primary);
  color: white;
  font-family: var(--dc-font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  border: none;
  border-radius: var(--dc-radius);
  cursor: pointer;
  transition: background 0.2s;
}

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

.dc-btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: transparent;
  color: var(--dc-text);
  font-family: var(--dc-font-heading);
  font-weight: 500;
  border: 1px solid var(--dc-border);
  border-radius: var(--dc-radius);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

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