/* =============================================================
   ENERGYM — Navigation
   
   Desktop  (1025px+):  two rows — topbar above, logo+links below
   Tablet   (601–1024px): single row — logo LEFT, burger RIGHT
   Mobile   (up to 600px): single row — logo LEFT, burger RIGHT
   ============================================================= */

/* ============================================================
   DESKTOP BASE STYLES
   ============================================================ */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  transition: background var(--dur-mid), backdrop-filter var(--dur-mid);
}
.site-header.scrolled {
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-border);
}

/* ---- Top info bar ---- */
.nav-topbar {
  width: 100%;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  padding-block: 0.6rem;
}
.nav-topbar-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 2rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2.5rem;
  font-size: 0.78rem;
  color: var(--clr-text-muted);
}
.nav-topbar-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}
.nav-topbar-item svg {
  width: 13px; height: 13px;
  fill: var(--clr-primary);
  flex-shrink: 0;
}
.nav-topbar-item a:hover { color: var(--clr-primary); }

/* ---- Main nav row — logo left, links right ---- */
.nav-main-row {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 2rem;
  padding-block: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---- Logo ---- */
.nav-logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.nav-logo-img {
  height: 44px;
  width: auto;
  display: block;
}

/* ---- Desktop nav links ---- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 3rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
  position: relative;
  transition: color var(--dur-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1.5px;
  background: var(--clr-primary);
  transition: width var(--dur-mid) var(--ease-out);
}
.nav-links a:hover        { color: var(--clr-text); }
.nav-links a:hover::after { width: 100%; }

/* ---- Hamburger — hidden on desktop ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: #f0f0f0;
  border-radius: 2px;
  transition: transform var(--dur-mid) var(--ease-out), opacity var(--dur-fast);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ============================================================
   OVERLAY MENU (mobile + tablet)
   ============================================================ */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 13, 0.97);
  z-index: 300;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-mid) var(--ease-out);
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 3rem;
  letter-spacing: 0.1em;
  color: var(--clr-text);
  transition: color var(--dur-fast);
}
.mobile-menu a:hover,
.mobile-menu a:active { color: var(--clr-primary); }

.mobile-close {
  position: absolute;
  top: 1.25rem; right: 1.25rem;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--clr-text-muted);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color var(--dur-fast);
}
.mobile-close:hover,
.mobile-close:active { color: var(--clr-primary); }

/* ============================================================
   TABLET  601px – 1024px
   Single row: logo far LEFT, hamburger far RIGHT
   ============================================================ */
@media (max-width: 1024px) {

  /* Hide the top info bar completely */
  .nav-topbar { display: none; }

  /* Header is now a single flex row */
  .site-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    background: rgba(13, 13, 13, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--clr-border);
  }

  /* nav-main-row fills the full header width
     space-between pushes logo to left, burger to right */
  .nav-main-row {
    width: 100%;
    max-width: 100%;
    padding-inline: 2rem;
    padding-block: 1rem;
    justify-content: space-between;
  }

  /* Hide desktop links */
  .nav-links { display: none; }

  /* Show hamburger */
  .nav-toggle { display: flex; }

  /* Overlay menu links slightly smaller on tablet */
  .mobile-menu a { font-size: 3rem; }
}

/* ============================================================
   MOBILE  up to 600px
   Tighter padding, smaller logo, smaller overlay text
   ============================================================ */
@media (max-width: 600px) {

  .nav-main-row {
    width: 100%;
    max-width: 100%;
    padding-inline: 1.25rem;
    padding-block: 0.85rem;
  }

  .nav-logo-img { height: 38px; }
  .mobile-menu a { font-size: 1.5rem; }
  .mobile-menu { gap: 2rem; }
}