/* ============================================================
   HiVi Labs — Nav, mega-menu, footer
   ============================================================ */

/* --- Top nav --- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  transition: background var(--dur-mid) var(--ease-out), border-color var(--dur-mid) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(251, 252, 255, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
  border-bottom-color: var(--border);
  box-shadow: 0 8px 30px -20px rgba(16, 24, 60, 0.30);
}
.nav__inner {
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding: 0.9rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.brand img { width: 34px; height: 34px; }
.brand__word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.04em;
  color: var(--text-hi);
}

.nav__links { display: flex; align-items: center; gap: 0.35rem; margin-left: 0.5rem; }
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.55em 0.85em;
  border-radius: var(--r-sm);
  color: var(--text-lo);
  font-size: var(--fs-14);
  font-weight: 500;
  background: none; border: 0; cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.nav__link:hover, .nav__link[aria-expanded="true"] { color: var(--text-hi); background: rgba(13,22,48,0.05); }
.nav__link .chev { width: 14px; height: 14px; transition: transform var(--dur-fast) var(--ease-out); }
.nav__link[aria-expanded="true"] .chev { transform: rotate(180deg); }

.nav__spacer { flex: 1; }
.nav__cta { display: flex; align-items: center; gap: 0.6rem; }

/* --- Mega menu --- */
.mega {
  position: absolute;
  top: 100%; left: 0; right: 0;
  z-index: var(--z-mega);
  padding: 0 var(--gutter) 1.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-mid) var(--ease-out), transform var(--dur-mid) var(--ease-out), visibility var(--dur-mid);
  /* The element is full-width but only the centered panel is interactive, so the
     transparent side gutters never swallow outside-clicks (they pass through to
     the page, which closes the menu). */
  pointer-events: none;
}
.mega.is-open { opacity: 1; visibility: visible; transform: none; }
.mega__panel {
  pointer-events: auto;
  max-width: var(--maxw-wide);
  margin-inline: auto;
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(24px) saturate(150%);
  backdrop-filter: blur(24px) saturate(150%);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  box-shadow: 0 40px 90px -34px rgba(16, 24, 60, 0.38);
  padding: 1.75rem;
}
.mega__cols {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1.1fr;
  gap: 1.5rem;
}
.mega__col-title {
  display: flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1rem;
}
.mega__col-title .icon { width: 15px; height: 15px; color: var(--accent-hi); }
.mega__col--automation .mega__col-title .icon { color: var(--accent-2); }
.mega__col--agents .mega__col-title .icon { color: var(--accent-2-deep); }

/* per-category tile tint */
.mega__col--automation .mega__tile { background: rgba(13,148,136,0.08); color: var(--accent-2); }
.mega__col--automation .mega__item:hover .mega__tile { border-color: var(--accent-2); color: var(--accent-2); }
.mega__col--agents .mega__tile { background: rgba(99,102,241,0.08); color: var(--accent-deep); }
.mega__col--agents .mega__item:hover .mega__tile { border-color: var(--accent-deep); color: var(--accent-deep); }

/* per-column "view all" link */
.mega__more {
  display: inline-flex; align-items: center; gap: 0.4em;
  margin-top: 0.5rem; padding: 0.5rem 0.65rem;
  font-family: var(--font-mono); font-size: var(--fs-12); letter-spacing: 0.04em;
  color: var(--accent-hi); font-weight: 600;
}
.mega__more .icon { width: 14px; height: 14px; transition: transform var(--dur-fast) var(--ease-out); }
.mega__more:hover .icon { transform: translateX(3px); }

/* full-width quick-links footer */
.mega__foot {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0.4rem 1.4rem;
  margin-top: 1.5rem; padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.mega__foot-label {
  font-family: var(--font-mono); font-size: var(--fs-12); letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-faint);
}
.mega__foot-link {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-size: var(--fs-14); font-weight: 500; color: var(--text-lo);
  transition: color var(--dur-fast) var(--ease-out);
}
.mega__foot-link .icon { width: 16px; height: 16px; color: var(--accent-hi); }
.mega__foot-link:hover { color: var(--text-hi); }
.mega__foot-cta {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 0.45em;
  font-size: var(--fs-14); font-weight: 600; color: var(--accent-hi);
}
.mega__foot-cta .icon { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease-out); }
.mega__foot-cta:hover .icon { transform: translateX(3px); }
.mega__item {
  display: flex;
  gap: 0.8rem;
  padding: 0.65rem;
  border-radius: var(--r-md);
  transition: background var(--dur-fast) var(--ease-out);
}
.mega__item:hover { background: rgba(13,22,48,0.04); }
.mega__item:hover .mega__tile { border-color: var(--accent-hi); color: var(--accent-hi); transform: translateY(-2px); }
.mega__tile {
  flex: none;
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(59,130,246,0.08);
  border: 1px solid var(--border);
  color: var(--text-mid);
  transition: all var(--dur-fast) var(--ease-out);
}
.mega__tile .icon { width: 19px; height: 19px; }
.mega__item-title { color: var(--text-hi); font-weight: 600; font-size: var(--fs-14); }
.mega__item-sub { color: var(--text-lo); font-size: var(--fs-12); line-height: 1.4; }

.mega__promo {
  background: linear-gradient(160deg, rgba(59,130,246,0.14), rgba(0,194,160,0.08));
  border: 1px solid rgba(59,130,246,0.22);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.mega__promo:hover { border-color: rgba(59,130,246,0.4); box-shadow: var(--shadow-sm); }
.mega__promo h4 { font-size: var(--fs-20); margin: 0.75rem 0 0.5rem; }
.mega__promo p { color: var(--text-mid); font-size: var(--fs-14); }
.mega__promo-link { color: var(--accent-hi); font-weight: 600; font-size: var(--fs-14); margin-top: 1rem; display: inline-flex; gap: 0.4em; align-items: center; }
.mega__promo-link .icon { transition: transform var(--dur-fast) var(--ease-out); }
.mega__promo:hover .mega__promo-link .icon { transform: translateX(3px); }

/* --- Platform mega: compact pillar overview ---
   A slim panel (no per-product columns / footer) so the Platform menu sits ~60%
   shorter than the Products catalog. The feature header tucks tighter and a single
   row of three pillar cards stands in for the old product columns. */
.mega--platform .mega__panel--slim { padding: 1.5rem; }
.mega--platform .mega__feature { margin-bottom: 1.25rem; }
.mega__pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
/* Each pillar carries its own gradient palette via custom props so the icon
   tile, glow, sheen and hover ring all pull from one source of truth.
   Defaults below = Products (blue → indigo). */
.mega__pillar {
  --p1: #3B82F6;
  --p2: #1E40AF;
  --p-tint: rgba(59, 130, 246, 0.16);
  --p-glow: rgba(59, 130, 246, 0.30);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.25rem 1.25rem 1.15rem;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  background:
    linear-gradient(155deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.42));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
  transition: border-color var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out);
}
/* Soft top-down brand glow — fades in on hover behind the content. */
.mega__pillar::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(120% 78% at 50% -12%, var(--p-tint), transparent 68%);
  opacity: 0;
  transition: opacity var(--dur-mid) var(--ease-out);
}
/* Diagonal sheen that sweeps across the card on hover. */
.mega__pillar::after {
  content: "";
  position: absolute;
  top: 0;
  left: -60%;
  z-index: -1;
  width: 55%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: skewX(-16deg);
  opacity: 0;
}
.mega__pillar:hover {
  border-color: color-mix(in srgb, var(--p1) 55%, var(--glass-border));
  transform: translateY(-5px);
  box-shadow: 0 22px 44px -22px var(--p-glow), inset 0 1px 0 rgba(255, 255, 255, 0.7);
}
.mega__pillar:hover::before { opacity: 1; }
.mega__pillar:hover::after { animation: pillarSheen var(--dur-slow) var(--ease-out); }
.mega__pillar:focus-visible {
  outline: none;
  border-color: var(--p1);
  box-shadow: 0 0 0 3px var(--p-tint);
}

.mega__pillar-top { display: flex; align-items: center; gap: 0.8rem; }
.mega__pillar-icon {
  flex: none;
  display: grid; place-items: center;
  width: 54px; height: 54px;
  border-radius: 15px;
  background: linear-gradient(135deg, var(--p1), var(--p2));
  background-size: 180% 180%;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  box-shadow: 0 12px 26px -12px var(--p-glow), inset 0 1px 0 rgba(255, 255, 255, 0.45);
  animation: pillarGrad 7s ease-in-out infinite;
  transition: transform var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out);
}
.mega__pillar-icon .icon { width: 27px; height: 27px; }
.mega__pillar:hover .mega__pillar-icon {
  transform: translateY(-3px) scale(1.06);
  box-shadow: 0 18px 32px -12px var(--p-glow), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}
.mega__pillar-title {
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--text-hi);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.mega__pillar-tag { color: var(--text-mid); font-size: var(--fs-14); line-height: 1.45; }
.mega__pillar-link {
  margin-top: auto;
  display: inline-flex; align-items: center; gap: 0.4em;
  font-weight: 600; font-size: var(--fs-13);
  background: linear-gradient(135deg, var(--p1), var(--p2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mega__pillar-link .icon {
  width: 15px; height: 15px;
  color: var(--p1);
  transition: transform var(--dur-fast) var(--ease-out);
}
.mega__pillar:hover .mega__pillar-link .icon { transform: translateX(4px); }

/* per-pillar gradient palettes */
.mega__pillar--automation {
  --p1: #00C2A0;
  --p2: #0F766E;
  --p-tint: rgba(13, 148, 136, 0.16);
  --p-glow: rgba(13, 148, 136, 0.32);
}
.mega__pillar--agents {
  --p1: #6366F1;
  --p2: #1E40AF;
  --p-tint: rgba(99, 102, 241, 0.16);
  --p-glow: rgba(99, 102, 241, 0.32);
}

@keyframes pillarGrad {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
@keyframes pillarSheen {
  from { left: -60%; opacity: 0; }
  35%  { opacity: 1; }
  to   { left: 130%; opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .mega__pillar-icon { animation: none; }
  .mega__pillar:hover::after { animation: none; }
  .mega__pillar:hover { transform: none; }
  .mega__pillar:hover .mega__pillar-icon { transform: none; }
}

/* --- Mobile nav --- */
.nav__toggle { display: none; background: none; border: 0; color: var(--text-hi); cursor: pointer; padding: 0.5rem; }
.nav__toggle .icon { width: 26px; height: 26px; }

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: rgba(251,252,255,0.97);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  padding: 5.5rem var(--gutter) 2rem;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
}
.mobile-nav.is-open { transform: none; }
.mobile-nav__group { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.mobile-nav__group > summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; font-family: var(--font-display); font-size: var(--fs-20); color: var(--text-hi);
}
.mobile-nav__group > summary::-webkit-details-marker { display: none; }
.mobile-nav__sub { padding: 0.75rem 0 0.25rem; display: grid; gap: 0.5rem; }
.mobile-nav__sub a { color: var(--text-lo); padding: 0.4rem 0; }
.mobile-nav__cta { margin-top: 2rem; display: grid; gap: 0.75rem; }

@media (max-width: 980px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; margin-left: auto; }
  .mega { display: none; }
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--border);
  background: var(--bg-base);
  padding-block: clamp(3.5rem, 6vw, 5rem) 2rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 2.5rem;
}
.footer__brand p { color: var(--text-lo); font-size: var(--fs-14); max-width: 30ch; margin-top: 1rem; }
.footer__col h5 {
  font-family: var(--font-mono); font-size: var(--fs-12); letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 1rem;
}
.footer__col a { display: block; color: var(--text-lo); font-size: var(--fs-14); padding: 0.3rem 0; transition: color var(--dur-fast); }
.footer__col a:hover { color: var(--text-hi); }
.footer__bottom {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center;
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  color: var(--text-faint); font-size: var(--fs-14);
}
.footer__tag { font-family: var(--font-mono); color: var(--accent-hi); }
@media (max-width: 760px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

/* --- Flash messages --- */
.flash-stack { position: fixed; top: 5rem; right: var(--gutter); z-index: var(--z-toast); display: grid; gap: 0.6rem; max-width: 360px; }
.flash {
  background: var(--bg-raised-2); border: 1px solid var(--border-strong);
  border-left: 3px solid var(--accent); border-radius: var(--r-md);
  padding: 0.9rem 1.1rem; color: var(--text-hi); font-size: var(--fs-14);
  box-shadow: var(--shadow-md); animation: flash-in var(--dur-slow) var(--ease-out);
}
.flash--success { border-left-color: var(--accent-2); }
.flash--error { border-left-color: var(--warn); }
@keyframes flash-in { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: none; } }