/* ============================================================
   SYSNOT Master Theme — header.css
   Header, Navigation & Mobile Menu
   ============================================================ */

/* ----------------------------------------------------------
   1. Main Header
   ---------------------------------------------------------- */

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 600;
  height: 72px;
  padding: 0 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background .5s, border-color .5s;
  border-bottom: 1px solid transparent;
}

/* ----------------------------------------------------------
   2. Scrolled State
   ---------------------------------------------------------- */

header.on {
  background: rgba(4, 4, 10, .9);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--brd);
}

[data-theme="light"] header.on {
  background: rgba(245, 244, 255, .9);
}

/* ----------------------------------------------------------
   3. Transparent State (On Hero)
   ---------------------------------------------------------- */

header.transparent {
  background: transparent;
  border-bottom-color: transparent;
}

header.transparent .logo,
header.transparent nav a {
  color: #fff;
}

header.transparent nav a:hover {
  color: var(--a3);
}

/* ----------------------------------------------------------
   4. Logo
   ---------------------------------------------------------- */

.logo {
  font-family: var(--head);
  font-size: 1.9rem;
  letter-spacing: .06em;
  color: var(--txt);
  line-height: 1;
  text-decoration: none;
}

.logo em {
  color: var(--a1);
  font-style: normal;
}

/* ----------------------------------------------------------
   5. Navigation
   ---------------------------------------------------------- */

nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

nav a {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mut);
  transition: color .3s;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--a3);
  transition: width .35s var(--e1);
}

nav a:hover::after {
  width: 100%;
}

nav a:hover {
  color: var(--txt);
}

/* ----------------------------------------------------------
   6. Burger Menu Button
   ---------------------------------------------------------- */

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 850;
}

.burger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--txt);
  border-radius: 2px;
  transition: transform .35s var(--e1), opacity .25s;
}

/* Burger open state animation */
.burger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.burger.open span:nth-child(2) {
  opacity: 0;
}

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

/* ----------------------------------------------------------
   7. Mobile Menu Overlay
   ---------------------------------------------------------- */

.mmenu {
  position: fixed;
  inset: 0;
  background: rgba(4, 4, 10, .97);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  z-index: 800;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  transform: translateX(100%);
  transition: transform .6s var(--e1);
}

[data-theme="light"] .mmenu {
  background: rgba(245, 244, 255, .97);
}

.mmenu.open {
  transform: translateX(0);
}

.mmenu a {
  font-family: var(--head);
  font-size: 3.2rem;
  letter-spacing: .05em;
  color: var(--mut);
  transition: color .3s, transform .3s var(--e2);
  line-height: 1.1;
}

.mmenu a:hover {
  color: var(--a1);
  transform: translateX(8px);
}

/* ----------------------------------------------------------
   8. Mobile Menu Close Button
   ---------------------------------------------------------- */

.mm-close {
  position: absolute;
  top: 1.2rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--sur);
  border: 1px solid var(--brd);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--txt);
  transition: border-color .3s, transform .3s var(--e2);
}

.mm-close:hover {
  border-color: var(--a2);
  transform: rotate(90deg);
}

/* ----------------------------------------------------------
   9. Responsive — Tablet & Mobile
   ---------------------------------------------------------- */

@media (max-width: 768px) {
  nav {
    display: none;
  }

  .burger {
    display: flex;
  }

  header {
    height: 64px;
  }

  .logo {
    font-size: 1.6rem;
  }

  .mmenu a {
    font-size: 2.4rem;
  }

  /* Hide custom cursor on mobile / touch devices */
  #cur,
  #cur-r {
    display: none;
  }

  body {
    cursor: auto;
  }
}