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

:root {
  --color-bg: #ffffff;
  --color-text: #111827;
  --color-muted: #6b7280;
  --color-accent: #1d4ed8;
  --color-accent-hover: #1e40af;
  --color-surface: #f9fafb;
  --color-border: #e5e7eb;
  --font-sans: system-ui, -apple-system, sans-serif;
  --max-width: 960px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 1rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-decoration: none;
}
.btn-primary { background: var(--color-accent); color: #fff; border: 2px solid var(--color-accent); }
.btn-primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); text-decoration: none; }
.btn-outline { background: transparent; color: var(--color-accent); border: 2px solid var(--color-accent); }
.btn-outline:hover { background: var(--color-accent); color: #fff; text-decoration: none; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
nav a { color: var(--color-text); font-size: 0.9375rem; }
nav a:hover { text-decoration: none; color: var(--color-accent); }

/* Hero */
.hero {
  padding: 5rem 0 4rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}
.hero .lead {
  font-size: 1.1875rem;
  color: var(--color-muted);
  max-width: 640px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* Features */
.features {
  padding: 4rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.features h2, .standards h2, .for-ngbs h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}
.feature {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.75rem;
}
.feature-icon {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.feature h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.625rem;
}
.feature p {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

/* Standards */
.standards {
  padding: 4rem 0;
}
.standards p {
  color: var(--color-muted);
  font-size: 1.0625rem;
  max-width: 680px;
  line-height: 1.7;
}

/* For NGBs */
.for-ngbs {
  padding: 4rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.benefit-list {
  list-style: none;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 680px;
}
.benefit-list li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 1.65;
}
.benefit-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.site-footer p { color: var(--color-muted); font-size: 0.875rem; }
.site-footer a { color: var(--color-muted); }
.site-footer a:hover { color: var(--color-accent); }

@media (max-width: 640px) {
  nav a:not(.btn) { display: none; }
  .site-footer .container { flex-direction: column; align-items: flex-start; }
}