/* ================================
   MENU BUTTON (BURGER)
   ================================ */

.menu-btn {
  position: fixed;
  top: 18px;
  right: 18px;
  width: 36px;
  height: 26px;

  display: flex;
  flex-direction: column;
  justify-content: space-between;

  background: none;
  border: none;
  padding: 0;
  cursor: pointer;

  z-index: 3001;
}

.menu-btn span {
  height: 3px;
  background: #f5f8ff;
  border-radius: 3px;
  transition: transform .3s ease, opacity .2s ease;
}

.menu-btn.active span:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}

.menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.menu-btn.active span:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

/* ================================
   MENU OVERLAY (BACKGROUND BLUR)
   ================================ */

.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 14, 32, 0.55);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s ease;
  z-index: 1999;
}

.menu-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* ================================
   SIDE MENU (GLASS PANEL)
   ================================ */

.side-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: min(64vw, 300px);
  height: 100vh;

  background: linear-gradient(
    180deg,
    rgba(14, 30, 64, 0.78),
    rgba(6, 14, 32, 0.88)
  );

  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);

  box-shadow:
    -18px 0 46px rgba(0,0,0,0.45),
    inset 1px 0 0 rgba(255,255,255,0.07);

  transform: translateX(100%);
  transition: transform .4s cubic-bezier(.22,.61,.36,1);

  z-index: 2000;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.side-menu.active {
  transform: translateX(0);
}

/* ================================
   MENU LINKS
   ================================ */

.side-menu a {
  position: relative;
  color: #e9f0ff;
  text-decoration: none;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  padding: 14px 0;
  width: 100%;
  text-align: center;
  opacity: 0.92;
  transition: opacity .25s ease;
}

.side-menu a:hover {
  opacity: 1;
}

.side-menu a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 42px;
  height: 1px;
  background: rgba(255,255,255,0.12);
}

.side-menu a:last-child::after {
  display: none;
}

/* ================================
   CLOSE BUTTON (X)
   ================================ */

.menu-close {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 30px;
  color: rgba(255,255,255,0.9);
  cursor: pointer;
}

/* ================================
   BODY LOCK + PAGE BLUR
   ================================ */

body.menu-open {
  overflow: hidden;
}

body.menu-open main,
body.menu-open .page {
  filter: blur(5px) brightness(0.9);
  transition: filter .35s ease;
}

main,
.page {
  transition: filter .35s ease;
}

/* ================================
   TAP HIGHLIGHT OFF
   ================================ */

* {
  -webkit-tap-highlight-color: transparent;
}

button {
  outline: none;
}