/* ==========================================================================
   MetricSlate — Static Brand Stylesheet
   Zero external CDN dependencies. Production-ready, responsive, lightweight.
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-dark: #0f172a;
  --color-surface-card-dark: #1e293b;
  --color-border: #e2e8f0;
  --color-border-dark: #334155;
  
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-subtle: #64748b;
  --color-text-light: #94a3b8;
  --color-text-white: #ffffff;
  
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-subtle: #eef2ff;
  --color-primary-border: #e0e7ff;
  
  --color-badge-bg: #fef3c7;
  --color-badge-text: #92400e;
  --color-badge-border: #fde68a;

  --max-w-container: 960px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1 0 auto;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

section[id] {
  scroll-margin-top: 80px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-w-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-text-white);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

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

.nav-link-cta {
  color: var(--color-primary) !important;
  font-weight: 600;
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-text-main);
}

/* Hero Section */
.hero-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 72px 0 64px;
  text-align: center;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background-color: var(--color-badge-bg);
  border: 1px solid var(--color-badge-border);
  color: var(--color-badge-text);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--color-text-main);
  max-width: 800px;
  margin: 0 auto 20px;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

.hero-meta {
  font-size: 0.8125rem;
  color: var(--color-text-subtle);
}

/* Section Shared Layouts */
.section {
  padding: 64px 0;
}

.section-alt {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-dark {
  background-color: var(--color-surface-dark);
  color: var(--color-text-white);
}

.section-header {
  margin-bottom: 40px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: inherit;
}

.section-intro {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.card-num {
  width: 36px;
  height: 36px;
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Policy Content Blocks */
.policy-content {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.policy-callout {
  padding: 14px 18px;
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-md);
  color: #166534;
  font-weight: 600;
}

.policy-meta {
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  margin-top: 4px;
}

.policy-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.policy-link:hover {
  color: var(--color-primary-hover);
}

code {
  background-color: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.8125rem;
  color: #0f172a;
}

/* Contact Grid */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.contact-info-list strong {
  color: var(--color-text-white);
  margin-right: 6px;
}

.contact-intro {
  color: var(--color-text-light);
}

.contact-box {
  background-color: var(--color-surface-card-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.contact-box h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-text-white);
}

.contact-box p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 20px;
}

.btn-primary {
  display: block;
  width: 100%;
  text-align: center;
  background-color: var(--color-primary);
  color: var(--color-text-white);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background-color 0.15s ease;
}

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

/* Footer */
.site-footer {
  background-color: #020617;
  border-top: 1px solid #1e293b;
  padding: 32px 0;
  color: var(--color-text-light);
  font-size: 0.75rem;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .hero-title {
    font-size: 1.875rem;
  }
  
  .hero-desc {
    font-size: 1rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 375px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .hero-title {
    font-size: 1.6rem;
  }
  
  .hero-section {
    padding: 48px 0;
  }
}