/* =========================
   Base
   ========================= */
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--ivory);
  font-size: 16px;
  line-height: var(--lh-base);
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================
   Header
   ========================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: rgba(250, 252, 250, 0.72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color var(--t-base) var(--ease-out), background var(--t-base) var(--ease-out);
}
.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(250, 252, 250, 0.92);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: url(../favicon.svg) center/contain no-repeat;
  box-shadow: var(--shadow-glow);
}
.brand-text { display: inline-flex; align-items: baseline; gap: 8px; line-height: 1; white-space: nowrap; }
.brand-text strong { font-weight: 800; letter-spacing: -0.03em; font-size: 14px; }
.brand-text em { font-style: normal; color: var(--text-tertiary); font-weight: 600; font-size: 13px; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}
.primary-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14.5px;
  transition: color var(--t-fast), background var(--t-fast), box-shadow var(--t-base);
}
.primary-nav a:hover { color: var(--primary-700); background: rgba(43,182,138,0.06); }
.primary-nav a.is-current { color: var(--primary-700); background: rgba(43,182,138,0.10); }

/* Vertical separator between in-page anchors and sub-page links */
.primary-nav .nav-divider {
  width: 1px;
  height: 18px;
  background: var(--border-strong);
  margin: 0 8px;
  align-self: center;
  opacity: 0.7;
}

/* CTA-style nav item */
.primary-nav .nav-cta a {
  margin-left: 8px;
  padding: 10px 18px;
  color: #fff;
  background: linear-gradient(120deg, var(--primary-700), var(--accent));
  box-shadow: 0 6px 18px rgba(43,182,138,0.25);
  font-weight: 600;
}
.primary-nav .nav-cta a:hover {
  background: linear-gradient(120deg, var(--primary-600), var(--accent));
  box-shadow: 0 10px 26px rgba(43,182,138,0.35);
  color: #fff;
}
.primary-nav .nav-cta a.is-current {
  background: linear-gradient(120deg, var(--primary-700), var(--accent));
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--t-base) var(--ease-out), opacity var(--t-base);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================
   Buttons
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-base), background var(--t-base), color var(--t-base);
  cursor: pointer;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--primary-700), var(--accent));
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 44px rgba(43,182,138,0.32); }
.btn-ghost {
  color: var(--primary-700);
  background: rgba(255,255,255,0.8);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: #fff; transform: translateY(-2px); }
.btn-block { width: 100%; padding: 16px 24px; }

/* =========================
   Section base
   ========================= */
.section {
  padding: var(--section-pad) 0;
  position: relative;
}
.section-head {
  text-align: center;
  margin-bottom: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.section-head.section-head-left {
  text-align: left;
  align-items: flex-start;
}
.section-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(43,182,138,0.08);
  color: var(--primary-700);
  font-family: var(--font-mono), var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 600;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(30px, 3.6vw, 48px);
  font-weight: 800;
  line-height: var(--lh-heading);
  letter-spacing: -0.025em;
}
.section-desc {
  color: var(--text-secondary);
  font-size: 16.5px;
  line-height: var(--lh-loose);
  max-width: 640px;
}
.section-desc strong { color: var(--primary-700); font-weight: 700; }
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* =========================
   Scroll reveal
   ========================= */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* =========================
   Footer
   ========================= */
.site-footer {
  background: linear-gradient(180deg, #102E50 0%, #081A35 100%);
  color: var(--text-on-dark);
  padding: 60px 0 28px;
  margin-top: 40px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr 1fr;
  gap: 36px;
}
.footer-brand strong {
  display: block;
  font-size: 17px;
  margin-bottom: 8px;
}
.footer-brand p { color: rgba(248,250,252,0.65); font-size: 14px; }
.footer-brand p + p { margin-top: 4px; }

.footer-orgs-label, .footer-links-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(248,250,252,0.55);
  font-weight: 700;
  margin-bottom: 12px;
}
.footer-orgs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 14px;
}
.footer-orgs li { color: rgba(248,250,252,0.85); }

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}
.footer-links a {
  color: rgba(248,250,252,0.85);
  transition: color var(--t-fast);
}
.footer-links a:hover { color: #fff; }

.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(248,250,252,0.10);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a {
  font-size: 14px;
  color: rgba(248,250,252,0.85);
  border-bottom: 1px solid rgba(248,250,252,0.3);
  padding-bottom: 2px;
}
.footer-bottom a:hover { color: #fff; border-color: #fff; }
.footer-bottom p { font-size: 13px; color: rgba(248,250,252,0.5); }