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

:root {
  --blue:       #1a5fa8;
  --blue-dark:  #144d8c;
  --blue-light: #e8f0fa;
  --gray-100:   #f7f8fa;
  --gray-200:   #e9ecef;
  --gray-600:   #6c757d;
  --gray-800:   #343a40;
  --text:       #1c1e21;
  --radius:     6px;
  --max-w:      1100px;
  --narrow:     720px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: #fff;
}

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

h1, h2, h3 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 1rem; }
h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

/* ── Layout ───────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container.narrow { max-width: var(--narrow); }

/* ── Buttons ──────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  background: var(--blue);
  color: #fff !important;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  text-decoration: none !important;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--blue-dark); }
.btn-primary.btn-lg { padding: 0.8rem 2rem; font-size: 1.05rem; }

/* ── Header / Nav ─────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  z-index: 100;
}

header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--blue);
  text-decoration: none;
  letter-spacing: -0.02em;
}

header nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

header nav ul a {
  font-size: 0.9rem;
  color: var(--gray-800);
  font-weight: 500;
}
header nav ul a:hover, header nav ul a.active { color: var(--blue); text-decoration: none; }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  background: var(--blue-light);
  padding: 5rem 0 4rem;
  text-align: center;
}
.hero .lead {
  max-width: 640px;
  margin: 1.25rem auto 2rem;
  font-size: 1.15rem;
  color: var(--gray-600);
}

/* ── PHI Callout ──────────────────────────────────────────── */
.callout {
  background: var(--blue);
  color: #fff;
  padding: 3.5rem 0;
  text-align: center;
}
.callout-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.callout h2 { color: #fff; }
.callout p { color: rgba(255,255,255,0.85); max-width: 600px; margin: 0.75rem auto 1.25rem; }
.callout a { color: #fff; font-weight: 600; text-decoration: underline; }
.callout a:hover { opacity: 0.85; }

/* ── Features ─────────────────────────────────────────────── */
.features {
  padding: 4.5rem 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 2.5rem;
}
.feature {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.feature h3 { color: var(--blue); }
.feature p { font-size: 0.95rem; color: var(--gray-600); margin: 0; }

/* ── Audience ─────────────────────────────────────────────── */
.audience {
  background: var(--gray-100);
  padding: 4rem 0;
  text-align: center;
}
.audience p {
  max-width: 600px;
  margin: 0.75rem auto 0;
  color: var(--gray-600);
}

/* ── CTA / Contact ────────────────────────────────────────── */
.cta {
  padding: 5rem 0;
  text-align: center;
}
.cta p { color: var(--gray-600); max-width: 540px; margin: 0.75rem auto 2rem; }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto;
  text-align: left;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--blue);
}
.contact-form button { align-self: flex-start; }

/* ── Page Hero (interior pages) ──────────────────────────── */
.page-hero {
  background: var(--blue-light);
  padding: 4rem 0 3rem;
}
.page-hero .lead {
  font-size: 1.15rem;
  color: var(--gray-600);
  margin-top: 0.75rem;
}

/* ── Content (interior pages) ────────────────────────────── */
.content {
  padding: 4rem 0 5rem;
}
.content h2 {
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--gray-200);
}
.content h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.content p { color: var(--gray-800); }

.arch-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.25rem 0;
}
.arch-list li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  background: var(--gray-100);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
}
.arch-list li strong { color: var(--blue); }
.arch-list li span { font-size: 0.95rem; color: var(--gray-600); }

/* ── Footer ───────────────────────────────────────────────── */
footer {
  background: var(--gray-800);
  color: rgba(255,255,255,0.6);
  padding: 1.5rem 0;
  font-size: 0.875rem;
}
footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
footer nav a,
footer p a { color: rgba(255,255,255,0.6); }
footer nav a:hover,
footer p a:hover { color: #fff; text-decoration: none; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 600px) {
  header nav ul { gap: 1rem; }
  header nav ul li:not(:last-child) { display: none; }
  .hero, .page-hero { padding: 3rem 0 2.5rem; }
  footer .container { flex-direction: column; gap: 0.5rem; text-align: center; }
}