/* ============================================================
   Agro BigGrow - navigation layer
   Scroll progress bar, fixed nav, burger + mobile menu.
   Loaded on every page.
   ============================================================ */

/* ---------- scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 1200;
  background: transparent;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--green), var(--green-2), var(--amber));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1100;
  transition: background 0.35s, box-shadow 0.35s, border-color 0.35s, backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}
.nav__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.5rem;
  height: var(--nav-h);
  transition: height 0.35s var(--ease-out);
}
.nav__brand { grid-column: 1; justify-self: start; }
.nav__links { grid-column: 2; justify-self: center; }
.nav__actions { grid-column: 3; justify-self: end; }
.nav.is-scrolled {
  background: rgba(250, 247, 239, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 6px 30px -12px rgba(14, 36, 23, 0.12);
}
.nav.is-scrolled .nav__inner { height: 64px; }

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.22rem;
  letter-spacing: -0.01em;
}
.brand-logo {
  display: block;
  height: 30px;
  width: auto;
  transition: transform 0.5s var(--ease-spring);
}
.brand-logo--footer { height: 32px; }
.nav__brand:hover .brand-logo { transform: rotate(-1.5deg) scale(1.04); }
@media (max-width: 560px) {
  .brand-logo { height: 26px; }
}

.nav__links { display: flex; gap: 0.35rem; }
.nav__link {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-2);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  transition: color 0.25s, background 0.25s;
}
.nav__link:hover { color: var(--ink); background: rgba(20, 38, 26, 0.05); }
.nav__link.is-active { color: var(--green-deep); background: var(--green-pastel); }

.nav__actions { display: flex; align-items: center; gap: 0.9rem; }

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 42px; height: 42px;
  padding: 0 10px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.35s var(--ease-out), opacity 0.25s;
}
.nav__burger[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

/* ---------- mobile menu ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1050;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  background: var(--pine);
  color: var(--cream);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease-out), visibility 0s 0.4s;
}
.mobile-menu.is-open { opacity: 1; visibility: visible; transition: opacity 0.4s var(--ease-out); }
.mobile-menu__links { display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.mobile-menu__links a {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 2.8rem);
  padding: 0.3rem 1rem;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out), color 0.25s;
}
.mobile-menu.is-open .mobile-menu__links a { opacity: 1; transform: none; }
.mobile-menu__links a:hover { color: var(--green-2); }
.mobile-menu__links a:nth-child(1) { transition-delay: 0.06s; }
.mobile-menu__links a:nth-child(2) { transition-delay: 0.12s; }
.mobile-menu__links a:nth-child(3) { transition-delay: 0.18s; }
.mobile-menu__links a:nth-child(4) { transition-delay: 0.24s; }
.mobile-menu__links a:nth-child(5) { transition-delay: 0.3s; }
.mobile-menu__links a:nth-child(6) { transition-delay: 0.36s; }

@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
}