/* SIG Invoice — Clean, Accessible, Responsive Stylesheet */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-subtle: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-primary: #1d4ed8;
  --color-primary-hover: #1e40af;
  --color-primary-light: #eff6ff;
  --color-accent: #0284c7;
  --color-danger: #b91c1c;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --max-width-content: 840px;
  --max-width-wide: 1100px;
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-primary-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Header & Nav */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text-primary);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.brand-subtitle {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* Layout */
.main-wrapper {
  flex: 1;
  padding: 2.5rem 1.5rem 4rem 1.5rem;
}

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

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

/* Hero & Landing */
.hero {
  text-align: center;
  padding: 3rem 1rem 3.5rem 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--color-text-primary);
}

.hero p {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 1.75rem;
}

.hero-operator {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 3rem;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.feature-card:hover {
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-md);
}

.feature-card h2,
.feature-card h3 {
  font-size: 1.1875rem;
  font-weight: 600;
  margin-bottom: 0.625rem;
  color: var(--color-text-primary);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Quick Links Card */
.compliance-links-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-top: 2rem;
}

.compliance-links-card h2 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.compliance-links-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

.compliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.compliance-box {
  display: block;
  text-decoration: none;
  padding: 1.25rem;
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.compliance-box:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.compliance-box strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--color-primary);
}

.compliance-box span {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  display: block;
  line-height: 1.4;
}

/* Policy / Legal / Document Pages */
.doc-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.doc-header h1 {
  font-size: 2.25rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.doc-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.doc-meta strong {
  color: var(--color-text-secondary);
}

.doc-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2.25rem;
  box-shadow: var(--shadow-sm);
}

.doc-card section {
  margin-bottom: 2.25rem;
}

.doc-card section:last-child {
  margin-bottom: 0;
}

.doc-card h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--color-border);
}

.doc-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.doc-card p {
  margin-bottom: 1rem;
  font-size: 0.98rem;
  line-height: 1.68;
  color: var(--color-text-secondary);
}

.doc-card ul,
.doc-card ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.68;
}

.doc-card li {
  margin-bottom: 0.4rem;
}

/* Callouts & Step Cards */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.callout-info {
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  color: #1e3a8a;
}

.callout-info p {
  color: #1e3a8a;
  margin-bottom: 0;
}

.callout-warning {
  background-color: var(--color-danger-bg);
  border-left: 4px solid var(--color-danger);
  border: 1px solid var(--color-danger-border);
  border-left-width: 4px;
  color: #7f1d1d;
}

.callout-warning p,
.callout-warning li {
  color: #7f1d1d;
}

.callout-warning ul {
  margin-top: 0.5rem;
  margin-bottom: 0;
}

.step-box {
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.step-box h3 {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
}

.badge-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 9999px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 700;
}

.step-box ol {
  margin-bottom: 0;
}

.step-box li {
  margin-bottom: 0.5rem;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  text-align: left;
}

th, td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-surface-subtle);
  font-weight: 600;
  color: var(--color-text-primary);
}

tr:last-child td {
  border-bottom: none;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 3rem 1.5rem 2rem 1.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.footer-nav h5 {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: 0.875rem;
}

.footer-nav ul {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 0.5rem;
}

.footer-nav a {
  text-decoration: none;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-nav a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav ul {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .hero h1 {
    font-size: 1.875rem;
  }

  .doc-card {
    padding: 1.5rem 1.25rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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