/* ==========================================================================
   USWDS & Civic Design System for Veterans Claims Guide
   Compliant with public domain U.S. Web Design System styling patterns
   ========================================================================== */

:root {
  /* Core Colors */
  --usa-blue-primary: #005ea2;
  --usa-blue-primary-dark: #1a4480;
  --usa-blue-primary-darker: #112e51;
  --usa-blue-primary-light: #73b3e7;
  --usa-blue-primary-lighter: #d9e8f6;
  
  --usa-accent-cool: #2e8540;
  --usa-accent-cool-dark: #1b5e20;
  --usa-accent-warm: #d83933;
  --usa-accent-gold: #fdb81e;
  --usa-accent-gold-light: #fff1d2;

  --usa-gray-5: #f0f0f0;
  --usa-gray-10: #e6e6e6;
  --usa-gray-30: #adadad;
  --usa-gray-50: #71767a;
  --usa-gray-90: #1b1b1b;
  --usa-white: #ffffff;
  
  --usa-font-sans: "Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --usa-font-serif: "Merriweather", Georgia, "Times New Roman", serif;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--usa-font-sans);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--usa-gray-90);
  background-color: var(--usa-gray-5);
  -webkit-font-smoothing: antialiased;
}

/* Civic Banner */
.usa-banner {
  background-color: var(--usa-gray-5);
  border-bottom: 1px solid var(--usa-gray-10);
  font-size: 0.825rem;
  padding: 0.4rem 1rem;
  color: var(--usa-gray-90);
}
.usa-banner-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.usa-banner-icon {
  font-size: 0.9rem;
}

/* Crisis Bar */
.crisis-line-bar {
  background-color: #f1f1f1;
  border-bottom: 2px solid #cd2026;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}
.crisis-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.crisis-btn {
  background-color: #cd2026;
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
}
.crisis-btn:hover {
  background-color: #981b1e;
}

/* Header */
.usa-header {
  background-color: var(--usa-white);
  border-bottom: 1px solid var(--usa-gray-10);
}
.header-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--usa-blue-primary-darker);
}
.logo-badge {
  background-color: var(--usa-blue-primary-darker);
  color: white;
  font-weight: 900;
  font-size: 1.25rem;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  letter-spacing: 1px;
}
.logo-text h1 {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--usa-blue-primary-darker);
}
.logo-text span {
  font-size: 0.775rem;
  color: var(--usa-gray-50);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.btn-signin {
  background-color: var(--usa-blue-primary);
  color: white;
  padding: 0.55rem 1.25rem;
  border-radius: 4px;
  font-weight: 700;
  text-decoration: none;
  font-size: 0.95rem;
  transition: background-color 0.15s ease;
}
.btn-signin:hover {
  background-color: var(--usa-blue-primary-dark);
}

/* Primary Nav */
.usa-nav {
  background-color: var(--usa-blue-primary-darker);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  overflow-x: auto;
}
.nav-link {
  color: white;
  text-decoration: none;
  padding: 0.85rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: all 0.15s ease;
}
.nav-link:hover, .nav-link.active {
  background-color: rgba(255,255,255,0.1);
  border-bottom-color: var(--usa-accent-gold);
}

/* Hero Section */
.usa-hero {
  background: linear-gradient(180deg, #112e51 0%, #1a4480 100%);
  color: white;
  padding: 3.5rem 1rem 4rem;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2.5rem;
  align-items: center;
}
@media (max-width: 850px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
}
.hero-content h2 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}
.hero-content p {
  font-size: 1.15rem;
  line-height: 1.5;
  color: #e6e6e6;
  margin-bottom: 1.5rem;
}
.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn-hero-primary {
  background-color: var(--usa-accent-gold);
  color: var(--usa-gray-90);
  font-weight: 700;
  padding: 0.85rem 1.75rem;
  border-radius: 4px;
  text-decoration: none;
  font-size: 1rem;
  box-shadow: var(--shadow-sm);
}
.btn-hero-primary:hover {
  background-color: #e5a617;
}
.btn-hero-secondary {
  background-color: transparent;
  color: white;
  border: 2px solid white;
  font-weight: 700;
  padding: 0.85rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-size: 1rem;
}
.btn-hero-secondary:hover {
  background-color: rgba(255,255,255,0.15);
}

/* Quick Start Box */
.hero-box {
  background-color: white;
  color: var(--usa-gray-90);
  border-radius: 6px;
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  border-top: 4px solid var(--usa-accent-gold);
}
.hero-box h3 {
  font-size: 1.25rem;
  color: var(--usa-blue-primary-darker);
  margin-bottom: 0.75rem;
}
.quick-list {
  list-style: none;
  margin-bottom: 1.25rem;
}
.quick-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--usa-gray-10);
  font-size: 0.925rem;
}
.quick-list li a {
  color: var(--usa-blue-primary);
  text-decoration: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.quick-list li a:hover {
  text-decoration: underline;
}

/* Layout Containers */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem;
}

/* Alerts */
.usa-alert {
  background-color: var(--usa-blue-primary-lighter);
  border-left: 8px solid var(--usa-blue-primary);
  padding: 1rem 1.25rem;
  border-radius: 4px;
  margin-bottom: 2rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.usa-alert.warning {
  background-color: var(--usa-accent-gold-light);
  border-left-color: var(--usa-accent-gold);
}
.usa-alert.emergency {
  background-color: #fce4e4;
  border-left-color: var(--usa-accent-warm);
}
.alert-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--usa-blue-primary-darker);
}
.alert-body p {
  font-size: 0.95rem;
  line-height: 1.45;
}

/* Section Header */
.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--usa-blue-primary-darker);
  margin-bottom: 0.5rem;
}
.section-subtitle {
  color: var(--usa-gray-50);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

/* Hub Grid */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.hub-card {
  background: white;
  border: 1px solid var(--usa-gray-10);
  border-radius: 6px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  border-left: 4px solid var(--usa-blue-primary);
}
.hub-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.hub-card.gold-border {
  border-left-color: var(--usa-accent-gold);
}
.hub-card.green-border {
  border-left-color: var(--usa-accent-cool);
}
.hub-card.red-border {
  border-left-color: var(--usa-accent-warm);
}
.card-header h3 {
  font-size: 1.25rem;
  color: var(--usa-blue-primary-darker);
  margin-bottom: 0.5rem;
}
.card-desc {
  font-size: 0.95rem;
  color: var(--usa-gray-90);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}
.card-action {
  margin-top: auto;
}
.card-btn {
  display: inline-block;
  background-color: var(--usa-blue-primary);
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}
.card-btn:hover {
  background-color: var(--usa-blue-primary-dark);
}

/* Polyglot Engine Section */
.tech-spec-box {
  background: white;
  border-radius: 8px;
  border: 1px solid var(--usa-gray-10);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
}
.tech-chips {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.tech-chip {
  background: var(--usa-gray-5);
  border: 1px solid var(--usa-gray-10);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--usa-blue-primary-darker);
}

/* Footer */
.usa-footer {
  background-color: var(--usa-blue-primary-darker);
  color: white;
  padding: 3.5rem 1rem 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--usa-accent-gold);
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 0.5rem;
}
.footer-links a {
  color: #d9e8f6;
  text-decoration: none;
  font-size: 0.9rem;
}
.footer-links a:hover {
  text-decoration: underline;
}
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: #adadad;
  text-align: center;
  line-height: 1.6;
}