:root {
  --navy-950: #071220;
  --navy-900: #0b1b2f;
  --slate-700: #31465f;
  --slate-500: #5b6f87;
  --border: #d7e0ea;
  --surface: #f5f8fb;
  --accent: #0f4c81;
  --success: #2f7a58;
  --shadow: 0 8px 22px rgba(8, 23, 41, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  color: var(--navy-900);
  background: #fff;
  line-height: 1.55;
}
a { color: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy-950);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 99;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.85rem 1rem;
}

.brand-wrap { display: flex; align-items: center; gap: 0.75rem; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 0.4rem;
  background: var(--navy-900);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}
.brand-title { font-size: 0.95rem; font-weight: 700; margin: 0; }
.brand-subtitle { margin: 0; font-size: 0.75rem; color: var(--slate-500); }

.nav-list {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 0;
  margin: 0;
}
.nav-list a {
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--slate-700);
  padding: 0.25rem 0.15rem;
  border-bottom: 2px solid transparent;
}
.nav-list a:hover,
.nav-list a:focus-visible { color: var(--accent); border-bottom-color: var(--accent); }

.layout-shell { display: grid; grid-template-columns: 1fr; max-width: 1240px; margin: 0 auto; }
.sidebar { padding: 1rem; }
.sidebar-card {
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  background: var(--surface);
}
.sidebar-card h2 { margin: 0.2rem 0 0.5rem; font-size: 1.05rem; }
.muted { font-size: 0.84rem; color: var(--slate-500); margin: 0 0 0.8rem; }
.people-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.85rem; }
.people-list li { display: grid; grid-template-columns: 52px 1fr; gap: 0.65rem; align-items: start; }
.people-list img { width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--border); }
.person-name { font-weight: 700; margin: 0; font-size: 0.88rem; }
.person-role, .person-bio { margin: 0; font-size: 0.78rem; color: var(--slate-700); }
.back-top { margin-top: 0.7rem; display: inline-block; font-weight: 600; font-size: 0.82rem; color: var(--accent); }

main { padding: 0 1rem 2rem; }
.section { padding: 2.5rem 0; }
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(135deg, rgba(15, 76, 129, 0.06) 25%, transparent 25%),
    linear-gradient(225deg, rgba(15, 76, 129, 0.06) 25%, transparent 25%),
    linear-gradient(45deg, rgba(15, 76, 129, 0.06) 25%, transparent 25%),
    linear-gradient(315deg, rgba(15, 76, 129, 0.06) 25%, #fff 25%);
  background-position: 15px 0, 15px 0, 0 0, 0 0;
  background-size: 30px 30px;
  opacity: 0.4;
  pointer-events: none;
}
.eyebrow {
  position: relative;
  margin: 0 0 0.7rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-size: 0.74rem;
}
h1 {
  position: relative;
  margin: 0;
  max-width: 16ch;
  font-size: clamp(1.9rem, 5vw, 3.3rem);
  line-height: 1.1;
}
.hero-subhead { position: relative; max-width: 65ch; font-size: 1rem; color: var(--slate-700); }
.hero-cta-row { position: relative; display: flex; gap: 0.7rem; flex-wrap: wrap; margin: 1.1rem 0 1.5rem; }
.btn {
  text-decoration: none;
  padding: 0.7rem 1rem;
  border-radius: 0.55rem;
  font-weight: 600;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
}
.btn-primary { background: var(--navy-900); color: #fff; }
.btn-primary:hover, .btn-primary:focus-visible { background: #102c4c; }
.btn-secondary { border: 1px solid var(--border); background: #fff; color: var(--navy-900); }

.trust-panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 1rem;
}
.trust-panel p { margin: 0 0 0.7rem; font-size: 0.86rem; color: var(--slate-700); }
.logo-row { list-style: none; margin: 0; padding: 0; display: flex; gap: 1rem; flex-wrap: wrap; }
.logo-row img { height: 24px; width: auto; }
.secure-note { font-weight: 600; color: var(--success) !important; }

.section h2 { margin: 0 0 0.6rem; font-size: clamp(1.35rem, 3vw, 2rem); }
.section-intro { margin: 0 0 1rem; color: var(--slate-700); max-width: 70ch; }

.features-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
.feature-card {
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  padding: 1rem;
  background: #fff;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.feature-card:hover, .feature-card:focus-within {
  transform: translateY(-2px);
  border-color: #bdd0e4;
  box-shadow: var(--shadow);
}
.feature-card svg { width: 1.4rem; height: 1.4rem; fill: var(--accent); }
.feature-card h3 { margin: 0.6rem 0; font-size: 1.02rem; }
.feature-card ul { margin: 0; padding-left: 1.1rem; color: var(--slate-700); font-size: 0.87rem; }

.accordion { display: grid; gap: 0.6rem; }
.accordion details { border: 1px solid var(--border); border-radius: 0.7rem; background: #fff; overflow: hidden; }
.accordion summary { cursor: pointer; padding: 0.8rem 1rem; font-weight: 600; list-style: none; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion pre { margin: 0; padding: 1rem; overflow: auto; }

.footer { background: var(--navy-950); color: #e8eef6; padding: 2rem 1rem 1rem; }
.footer-grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.footer h2 { font-size: 1rem; margin: 0 0 0.7rem; }
.repo-stats { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.repo-stats li { display: flex; justify-content: space-between; border-bottom: 1px solid rgba(255, 255, 255, 0.12); padding: 0.35rem 0; }
.repo-stats span { color: #adc1d8; }
.contact-form { display: grid; gap: 0.5rem; }
.contact-form input {
  padding: 0.62rem 0.72rem;
  border-radius: 0.5rem;
  border: 1px solid #5c7895;
  background: #0d2239;
  color: #fff;
}
.contact-form button {
  width: max-content;
  padding: 0.6rem 0.9rem;
  border: 1px solid #8cb2d8;
  border-radius: 0.5rem;
  background: transparent;
  color: #d8e8f8;
  font-weight: 600;
}
.social-links { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.social-links a { color: #d8e8f8; }
.footer-meta {
  max-width: 1240px;
  margin: 1.2rem auto 0;
  font-size: 0.8rem;
  color: #adc1d8;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 0.8rem;
}

@media (min-width: 768px) {
  .topbar { padding: 0.85rem 1.5rem; }
  .layout-shell { grid-template-columns: minmax(0, 1fr) 280px; align-items: start; }
  .sidebar {
    order: 2;
    padding: 1.5rem 1rem;
    position: sticky;
    top: 72px;
    max-height: calc(100vh - 82px);
    overflow: auto;
  }
  main { order: 1; padding: 0 1.5rem 2rem; }
  .features-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer { padding: 2.2rem 1.5rem 1rem; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
}

@media (min-width: 1024px) {
  .topbar { padding: 0.9rem 2rem; }
  .layout-shell { grid-template-columns: minmax(0, 1fr) 320px; }
  .hero {
    min-height: 66vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .section { padding: 3.25rem 0; }
  main { padding: 0 2rem 2.5rem; }
}