/* ========================================================================
   HEADER — Sticky, Blur Backdrop
   ======================================================================== */

.tn-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--duration) var(--ease);
}

.tn-header.scrolled {
  height: 52px;
  background: rgba(10, 10, 15, 0.95);
  border-bottom-color: var(--color-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

[data-theme="light"] .tn-header {
  background: rgba(245, 245, 250, 0.85);
}

[data-theme="light"] .tn-header.scrolled {
  background: rgba(245, 245, 250, 0.95);
}

.admin-bar .tn-header {
  top: 32px;
}

@media (max-width: 782px) {
  .admin-bar .tn-header {
    top: 46px;
  }
}

.tn-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-md);
}

/* ---- Logo ------------------------------------------------------------ */

.tn-logo {
  font-family: var(--font-headline);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
  flex-shrink: 0;
}

.tn-logo span {
  color: var(--color-accent);
}

/* ---- Primary Nav ----------------------------------------------------- */

.tn-nav {
  display: none;
}

@media (min-width: 1024px) {
  .tn-nav {
    display: flex;
    align-items: center;
    gap: var(--sp-lg);
  }
}

.tn-nav__link {
  position: relative;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--sp-xs) 0;
  transition: color var(--duration-fast) var(--ease);
}

.tn-nav__link:hover,
.tn-nav__link.current {
  color: var(--color-text);
}

.tn-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration) var(--ease);
}

.tn-nav__link:hover::after,
.tn-nav__link.current::after {
  width: 100%;
}

/* Dropdown */
.tn-nav__item {
  position: relative;
}

.tn-nav__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--sp-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.tn-nav__item:hover .tn-nav__dropdown,
.tn-nav__item:focus-within .tn-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.tn-nav__dropdown a {
  display: block;
  padding: var(--sp-sm) var(--sp-md);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease);
}

.tn-nav__dropdown a:hover {
  background: rgba(var(--color-accent-rgb), 0.06);
  color: var(--color-accent);
}

/* ---- Right actions --------------------------------------------------- */

.tn-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  flex-shrink: 0;
}

.tn-header__icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  font-size: 1rem;
}

.tn-header__icon-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.tn-header__icon-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Newsletter CTA (header) */
.tn-header__cta {
  display: none;
}

@media (min-width: 768px) {
  .tn-header__cta {
    display: inline-flex;
  }
}

/* ---- Search Overlay -------------------------------------------------- */

.tn-search-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20vh;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration) var(--ease);
}

.tn-search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.tn-search-overlay__inner {
  width: 100%;
  max-width: 600px;
  padding: var(--sp-md);
}

.tn-search-overlay__input {
  width: 100%;
  padding: var(--sp-md) var(--sp-lg);
  font-family: var(--font-headline);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--color-border);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease);
}

.tn-search-overlay__input::placeholder {
  color: var(--color-text-secondary);
}

.tn-search-overlay__input:focus {
  border-bottom-color: var(--color-accent);
}

.tn-search-overlay__close {
  position: absolute;
  top: var(--sp-lg);
  right: var(--sp-lg);
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) var(--ease);
}

.tn-search-overlay__close:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---- Mobile Menu ----------------------------------------------------- */

.tn-mobile-toggle {
  display: flex;
}

@media (min-width: 1024px) {
  .tn-mobile-toggle {
    display: none;
  }
}

.tn-mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  z-index: 1050;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  padding: var(--sp-2xl) var(--sp-lg);
  transform: translateX(100%);
  transition: transform var(--duration) var(--ease);
  overflow-y: auto;
}

.tn-mobile-menu.open {
  transform: translateX(0);
}

.tn-mobile-menu__backdrop {
  position: fixed;
  inset: 0;
  z-index: 1040;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration) var(--ease);
}

.tn-mobile-menu__backdrop.open {
  opacity: 1;
  visibility: visible;
}

.tn-mobile-menu__close {
  position: absolute;
  top: var(--sp-md);
  right: var(--sp-md);
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tn-mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
  margin-top: var(--sp-lg);
}

.tn-mobile-menu__nav a {
  display: block;
  padding: var(--sp-sm) 0;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--duration-fast) var(--ease);
}

.tn-mobile-menu__nav a:hover {
  color: var(--color-accent);
}