/* Mega Menu 3 · Simple */
.menu-m3 .nav-item { position: relative; }
.mega-m3 {
  top: calc(100% + 10px); left: -24px; width: 720px; max-width: calc(100vw - 48px);
  background: var(--white); border-radius: 12px; overflow: hidden;
  box-shadow: 0 30px 60px -24px rgba(0, 27, 49, .5), 0 0 0 1px rgba(0, 41, 72, .06);
}
.mega-m3::before { content: ""; position: absolute; left: 0; right: 0; top: -14px; height: 14px; }
.nav-item.open .mega-m3 { overflow: visible; }
.m3-q { padding: 24px 24px 12px; font-weight: 600; font-size: 15px; color: var(--ink-muted); }
.m3-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; padding: 0 8px 14px; }
.m3-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: var(--radius); transition: background-color .2s var(--ease); }
.m3-ico { display: grid; place-items: center; width: 44px; height: 44px; flex-shrink: 0; border-radius: var(--radius); background: var(--surface-alt); color: var(--navy); transition: background-color .2s, color .2s, transform .25s var(--ease); }
.m3-text strong { display: block; font-size: 17px; color: var(--navy); }
.m3-text small { display: block; margin-top: 2px; font-size: 14px; color: var(--ink-muted); }
.m3-item .arrow { margin-left: auto; width: 18px; height: 18px; color: var(--navy); opacity: 0; transform: translateX(-6px); transition: opacity .2s, transform .25s var(--ease); }
.m3-item:hover { background: var(--surface-alt); }
.m3-item:hover .m3-ico { background: var(--navy); color: var(--cyan); }
.m3-item:hover .arrow { opacity: 1; transform: none; }
.m3-foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 24px; background: var(--surface-alt); border-top: 1px solid var(--line); border-radius: 0 0 12px 12px; }
.m3-help { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; color: var(--ink-muted); }
.m3-help .i { width: 18px; height: 18px; }
.m3-help strong { color: var(--navy); transition: color .2s; }
.m3-help:hover strong { color: var(--cyan-ink); text-decoration: underline; }
.menu-m3 .nav-item:nth-child(n + 4) .mega-m3 { left: auto; right: -24px; }