/* ── NAV BAR ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  transition:
    background 0.35s,
    border 0.35s;
}

[data-theme="light"] nav {
  background: rgba(245, 244, 252, 0.88);
}

.nav-logo {
  font-family: "DM Mono", monospace;
  font-size: 15px;
  color: var(--accent2);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 5px;
}

.nav-logo img {
  width: 25px;
}

.nav-logo img {
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%,
  100% {
    transform: translateY(2px);
  }
  50% {
    transform: translateY(-2px);
  }
}

.nav-links {
  display: flex;
  gap: 0.2rem;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 20px;
  transition:
    color 0.2s,
    background 0.2s;
  font-weight: 400;
}

.nav-links a:hover {
  color: var(--text);
  background: var(--border);
}

.nav-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* Animated glass shimmer on navbar */
nav::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;

  background: linear-gradient(
    120deg,
    transparent 20%,
    rgba(255, 255, 255, 0.06) 50%,
    transparent 80%
  );

  transform: translateX(-120%);
  animation: navShimmer 4s linear infinite;
}

@keyframes navShimmer {
  to {
    transform: translateX(120%);
  }
}

.ctrl-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-family: "Outfit", sans-serif;
  transition: all 0.2s;
}

.ctrl-btn:hover {
  color: var(--text);
  border-color: var(--border2);
}

.lang-select {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-family: "Outfit", sans-serif;
  outline: none;
  transition: all 0.2s;
}

.lang-select:hover {
  border-color: var(--border2);
  color: var(--text);
}

/* ── HAMBURGER ICON ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  padding: 8px;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.hamburger:hover {
  border-color: var(--border2);
}

.hamburger span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--muted);
  border-radius: 2px;
  transition:
    transform 0.32s cubic-bezier(0.77, 0, 0.18, 1),
    opacity 0.22s;
  transform-origin: center;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ── MOBILE DRAWER ── */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  pointer-events: none;
}

.mobile-drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 10, 0.72);
  opacity: 0;
  transition: opacity 0.32s ease;
  backdrop-filter: blur(4px);
}

.mobile-drawer-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(300px, 82vw);
  height: 100%;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform 0.36s cubic-bezier(0.77, 0, 0.18, 1);
  padding: 2rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

[dir="rtl"] .mobile-drawer-panel {
  right: auto;
  left: 0;
  border-left: none;
  border-right: 1px solid var(--border);
  transform: translateX(-100%);
}

.mobile-drawer.open {
  pointer-events: all;
}

.mobile-drawer.open .mobile-drawer-backdrop {
  opacity: 1;
}

.mobile-drawer.open .mobile-drawer-panel {
  transform: translateX(0);
}

[dir="rtl"] .mobile-drawer.open .mobile-drawer-panel {
  transform: translateX(0);
}

.mobile-drawer-panel a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
  font-weight: 400;
  padding: 11px 14px;
  border-radius: 10px;
  transition:
    background 0.18s,
    color 0.18s;
}

.mobile-drawer-panel a:hover {
  background: var(--bg3);
  color: var(--text);
}

.drawer-divider {
  height: 1px;
  background: var(--border);
  margin: 10px 0;
}

.drawer-controls {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    rgba(124, 92, 255, 0.18),
    rgba(255, 255, 255, 0.04)
  );
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.92);
  transition:
    opacity 0.35s ease,
    transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.3s ease,
    box-shadow 0.3s ease;
  z-index: 999;
}

/* glowing ring */
#back-to-top::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(124, 92, 255, 0.8),
    transparent 40%
  );
  animation: rotateRing 4s linear infinite;
  opacity: 0;
  transition: opacity 0.35s ease;
}

/* inner layer */
#back-to-top::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: inherit;
  background: var(--tag-bg);
  z-index: 0;
}

/* icon */
#back-to-top svg,
#back-to-top i,
#back-to-top span {
  position: relative;
  z-index: 2;
  transition:
    transform 0.35s ease,
    color 0.35s ease;
}

/* visible state */
#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  animation: floatButton 3s ease-in-out infinite;
}

/* hover */
#back-to-top:hover {
  border-color: rgba(124, 92, 255, 0.4);
  transform: translateY(-4px) scale(1.06);
  box-shadow:
    0 10px 30px rgba(124, 92, 255, 0.18),
    0 0 18px rgba(124, 92, 255, 0.2);
}

/* show animated ring */
#back-to-top:hover::before {
  opacity: 1;
}

/* icon movement */
#back-to-top:hover svg,
#back-to-top:hover i,
#back-to-top:hover span {
  transform: translateY(-2px) scale(1.08);
}

/* rotating ring */
@keyframes rotateRing {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* floating idle animation */
@keyframes floatButton {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }

  50% {
    transform: translateY(-4px) scale(1.01);
  }
}

/* ── NAV RESPONSIVE ── */
@media (max-width: 768px) {
  nav {
    padding: 0 1rem;
  }
  .nav-links {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .mobile-drawer {
    display: block;
  }
  .nav-controls {
    display: none;
  }
}