/* ═══════════════════════════════════════════════
   HEADER & NAVIGATION STYLES
   ═══════════════════════════════════════════════ */
.nd-header {
  position: fixed; top: 0; left: 0; right: 0; height: 60px;
  background: var(--nd-header-bg);
  backdrop-filter: blur(20px) saturate(1.6);
  border-bottom: 1px solid var(--nd-border);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  padding: 0 clamp(1.2rem, 3vw, 3rem);
  z-index: 1000;
  transition: background 0.4s ease, border-color 0.4s ease;
}

.nd-header__left { display: flex; align-items: center; height: 100%; justify-self: start; }
.nd-header__right { display: flex; align-items: center; height: 100%; justify-self: end; gap: 0.55rem; }
.nd-nav { display: flex; align-items: center; height: 100%; justify-self: center; gap: 0.25rem; }

/* Interactive Container Base */
.nd-brand, .nd-selector__trigger, .nd-player {
  display: flex; align-items: center;
  border-radius: 8px; border: 1px solid transparent;
  cursor: pointer; transition: all 0.2s ease;
}

.nd-brand { gap: 0.5rem; padding: 0.35rem 0.6rem; }
.nd-brand:hover { background: var(--triny-glow); border-color: var(--nd-border-hover); }
.nd-brand__logo { width: 28px; height: 28px; border-radius: 6px; object-fit: cover; }
.nd-brand__name { font-weight: 700; font-size: 0.9rem; color: var(--triny-accent); letter-spacing: 0.3px; }

.nd-selector { position: relative; }
.nd-selector__trigger { gap: 0.4rem; padding: 0.32rem 0.65rem; border-color: var(--nd-border); color: var(--nd-text); font-weight: 500; font-size: 0.8rem; }
.nd-selector__trigger:hover, .nd-player:hover { background: var(--nd-border); border-color: var(--nd-border-hover); }
.nd-selector.active .nd-selector__trigger, .nd-selector.active .nd-player { background: var(--triny-glow); border-color: var(--triny-glow-strong); }
.nd-selector__icon { width: 15px; height: 15px; opacity: 0.7; }
.nd-selector__trigger:hover .nd-selector__icon { opacity: 1; }

.nd-player { gap: 0.45rem; padding: 0.25rem 0.65rem 0.25rem 0.25rem; border-color: var(--nd-border); border-radius: 50px; }
.nd-player__avatar { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--triny-accent); }
.nd-player__name { font-weight: 600; font-size: 0.8rem; color: var(--nd-text); }

/* Arrows */
.nd-brand__arrow, .nd-selector__arrow {
  width: 16px; height: 16px; fill: currentColor; transition: transform 0.25s ease;
}
.nd-brand__arrow { fill: var(--triny-accent); opacity: 0.6; }
.nd-selector__arrow { width: 14px; height: 14px; opacity: 0.5; }
.nd-header__left:hover .nd-brand__arrow, .nd-selector.active .nd-selector__arrow { transform: rotate(180deg); opacity: 1; }

/* Navigation Links */
.nd-nav__link {
  font-size: 0.84rem; font-weight: 500; color: var(--nd-text-secondary);
  padding: 0.38rem 0.85rem; border-radius: 6px; transition: all 0.2s ease;
}
.nd-nav__link:hover { color: var(--nd-text); background: var(--nd-border); }
.nd-nav__link--active { color: var(--triny-accent); background: var(--triny-glow); font-weight: 600; }

/* Menus & Dropdowns */
.nd-mega, .nd-selector__menu {
  position: absolute; top: calc(100% + 6px);
  background: var(--nd-dropdown-bg); backdrop-filter: blur(28px) saturate(1.5);
  -webkit-backdrop-filter: blur(28px) saturate(1.5);
  border: 1px solid var(--nd-border);
  opacity: 0; visibility: hidden; transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1005;
}

.nd-mega { left: 0; width: 340px; border-radius: 12px; box-shadow: 0 16px 48px var(--nd-shadow-elevated); padding: 1rem; display: flex; gap: 0.6rem; transform: translateY(-4px); }
.nd-header__left:hover .nd-mega { opacity: 1; visibility: visible; transform: translateY(0); }

.nd-selector__menu { right: 0; min-width: 130px; border-radius: 10px; box-shadow: 0 12px 36px var(--nd-shadow-elevated); padding: 0.3rem; display: flex; flex-direction: column; gap: 0.1rem; transform: translateY(-3px); z-index: 1005; }
.nd-selector.active .nd-selector__menu { opacity: 1 !important; visibility: visible !important; transform: translateY(0) !important; }

.nd-mega__col { flex: 1; display: flex; flex-direction: column; gap: 0.4rem; }
.nd-mega__label { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--nd-text-muted); padding: 0 0.5rem; }
.nd-mega__link { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.6rem; border-radius: 8px; font-weight: 600; font-size: 0.85rem; color: var(--nd-text); border: 1px solid transparent; transition: all 0.15s ease; }
.nd-mega__link:hover { background: var(--triny-glow); border-color: var(--nd-border-hover); color: var(--triny-accent); }

.nd-selector__option { display: block; padding: 0.42rem 0.7rem; border-radius: 6px; font-size: 0.8rem; font-weight: 500; color: var(--nd-text-secondary); cursor: pointer; border: 1px solid transparent; transition: all 0.12s ease; }
.nd-selector__option:hover { background: var(--nd-border); color: var(--nd-text); }
.nd-selector__option.selected { background: var(--triny-glow); color: var(--triny-accent); font-weight: 600; border-color: var(--triny-glow-strong); }

/* Standalone Filter & Product Selectors */
.nd-selector--filter, .nd-selector--product {
  position: relative;
  z-index: 101;
  cursor: pointer;
  user-select: none;
}
.nd-selector--filter .nd-selector__trigger,
.nd-selector--product .nd-selector__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.65rem 1.2rem;
  background: var(--nd-surface-2);
  border: 1px solid var(--nd-border);
  border-radius: 10px;
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  color: var(--nd-text);
  min-width: 180px;
  transition: all 0.2s ease;
}
.nd-selector--filter .nd-selector__trigger:hover,
.nd-selector--product .nd-selector__trigger:hover {
  border-color: var(--nd-border-hover);
  background: var(--nd-surface-3);
}
.nd-selector--filter.active .nd-selector__trigger,
.nd-selector--product.active .nd-selector__trigger {
  border-color: var(--triny-accent);
  background: var(--nd-surface-3);
  box-shadow: 0 0 16px var(--triny-glow);
}
.nd-selector--filter .nd-selector__arrow,
.nd-selector--product .nd-selector__arrow {
  width: 16px;
  height: 16px;
  fill: currentColor;
  opacity: 0.6;
  transition: transform 0.25s ease;
}
.nd-selector--filter.active .nd-selector__arrow,
.nd-selector--product.active .nd-selector__arrow {
  transform: rotate(180deg);
  opacity: 1;
}

.nd-selector--filter .nd-selector__menu,
.nd-selector--product .nd-selector__menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  min-width: 180px;
  background: var(--nd-dropdown-bg);
  backdrop-filter: blur(28px) saturate(1.5);
  -webkit-backdrop-filter: blur(28px) saturate(1.5);
  border: 1px solid var(--nd-border);
  border-radius: 10px;
  box-shadow: 0 12px 36px var(--nd-shadow-elevated);
  padding: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1005;
}
.nd-selector--filter.active .nd-selector__menu,
.nd-selector--product.active .nd-selector__menu {
  opacity: 1 !important;
  visibility: visible !important;
  transform: translateY(0) !important;
}

/* Burger Button */
.nd-burger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid var(--nd-border);
  border-radius: 8px;
  padding: 7px;
  cursor: pointer;
  z-index: 1005;
  transition: all 0.25s ease;
}
.nd-burger:hover {
  background: var(--nd-border);
  border-color: var(--nd-border-hover);
}
.nd-burger__bar {
  width: 100%;
  height: 2px;
  background-color: var(--nd-text);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform-origin: center;
}
.nd-burger.active .nd-burger__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nd-burger.active .nd-burger__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nd-burger.active .nd-burger__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Sidebar Backdrop Overlay */
.nd-sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s ease;
  z-index: 1999;
}
.nd-sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Sidebar Panel */
.nd-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  background: var(--nd-surface-1);
  border-left: 1px solid var(--nd-border);
  box-shadow: -12px 0 40px var(--nd-shadow-elevated);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 2000;
  display: flex;
  flex-direction: column;
}
.nd-sidebar.active {
  transform: translateX(0);
}

.nd-sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.4rem;
  border-bottom: 1px solid var(--nd-border);
}
.nd-sidebar__title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--nd-text);
  letter-spacing: 0.5px;
}
.nd-sidebar__close {
  background: none;
  border: none;
  color: var(--nd-text-muted);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, transform 0.2s ease;
  padding: 0 0.3rem;
}
.nd-sidebar__close:hover {
  color: var(--triny-accent);
  transform: scale(1.15);
}

.nd-sidebar__content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  padding: 1.4rem;
  overflow-y: auto;
}

.nd-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.nd-sidebar__link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--nd-text-secondary);
  transition: all 0.2s ease;
  border: 1px solid transparent;
}
.nd-sidebar__link:hover {
  color: var(--nd-text);
  background: var(--nd-border);
  border-color: var(--nd-border-hover);
  transform: translateX(4px);
}
.nd-sidebar__link--active {
  color: var(--triny-accent);
  background: var(--triny-glow);
  border-color: var(--triny-glow-strong);
}

.nd-sidebar__footer {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--nd-border);
}

.nd-sidebar__footer .nd-selector {
  width: 100%;
}
.nd-sidebar__footer .nd-selector__trigger {
  width: 100%;
  justify-content: space-between;
  padding: 0.65rem 0.9rem;
  font-size: 0.85rem;
  border-radius: 10px;
}
.nd-sidebar__footer .nd-selector__menu {
  position: static;
  width: 100%;
  box-shadow: none;
  border: 1px solid var(--nd-border);
  margin-top: 0.4rem;
}

/* Header Responsive Breakpoints */
@media (max-width: 768px) {
  .nd-header {
    grid-template-columns: auto 1fr;
    padding: 0 1.2rem;
  }
  .nd-nav {
    display: none !important;
  }
  .nd-header__right .nd-selector {
    display: none !important;
  }
  .nd-burger {
    display: flex;
  }
  .nd-mega {
    width: 280px;
    flex-direction: column;
  }
}