/* =========================================================
   HEADER_MAIN.CSS
   4 Season Shield Insulation
   Premium navbar inspired by the Lupa structure
   ========================================================= */

/* =========================================================
   NAVBAR WRAPPER
========================================================== */
.main-header,
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  width: 100%;
  z-index: 1500;
  padding: 18px 0;
  background: transparent;
  transition:
    background var(--transition-medium),
    backdrop-filter var(--transition-medium),
    border-color var(--transition-medium),
    box-shadow var(--transition-medium),
    padding var(--transition-medium),
    transform var(--transition-medium);
}

.main-header::before,
.nav::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 12, 8, 0.42) 0%, rgba(7, 12, 8, 0.12) 100%);
  opacity: 1;
  pointer-events: none;
  transition: opacity var(--transition-medium);
}

.main-header.scrolled,
.nav.isScrolled,
.nav.scrolled {
  padding: 12px 0;
  background: rgba(9, 14, 10, 0.84);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
}

.main-header.scrolled::before,
.nav.isScrolled::before,
.nav.scrolled::before {
  opacity: 0;
}

/* =========================================================
   NAV INNER SHELL
========================================================== */
.header-shell,
.nav__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: calc(var(--container-width) + (var(--container-padding) * 2));
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* =========================================================
   BRAND
========================================================== */
.brand,
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand__logo,
.brand-mark__logo {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 0;
  background:
    linear-gradient(145deg, rgba(141, 198, 63, 0.18), rgba(141, 198, 63, 0.06));
  border: 1px solid rgba(141, 198, 63, 0.3);
  color: var(--color-primary);
  font-size: 1.02rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast);
}

.brand:hover .brand__logo,
.brand-mark:hover .brand-mark__logo,
.brand:hover .brand__logo,
.brand-mark:hover .brand__logo {
  transform: translateY(-1px);
  border-color: rgba(141, 198, 63, 0.45);
  background:
    linear-gradient(145deg, rgba(141, 198, 63, 0.24), rgba(141, 198, 63, 0.1));
}

.brand__text,
.brand-mark__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand__text strong,
.brand-mark__text strong {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-white);
}

.brand__text small,
.brand-mark__text small {
  margin-top: 5px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.66);
}

/* =========================================================
   DESKTOP NAV
========================================================== */
.nav__desktop,
.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
  transition:
    color var(--transition-fast),
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6px;
  height: 2px;
  border-radius: 999px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-white);
}

.nav__link:hover::after,
.nav__link.active::after {
  transform: scaleX(1);
}

/* =========================================================
   DESKTOP CTA
========================================================== */
.header-phone,
.nav__desktop .btn--cta {
  min-height: 46px;
  padding: 0 18px;
  border-radius: 0;
  border: 1px solid rgba(141, 198, 63, 0.34);
  background: rgba(141, 198, 63, 0.12);
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.header-phone:hover,
.nav__desktop .btn--cta:hover {
  transform: translateY(-2px);
  background: var(--gradient-primary);
  border-color: transparent;
  color: #0b120b;
  box-shadow: 0 12px 28px rgba(141, 198, 63, 0.2);
}

/* =========================================================
   MOBILE TOGGLE
========================================================== */
.nav-toggle,
.nav__toggle {
  display: none;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  border-radius: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.nav-toggle:hover,
.nav__toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(141, 198, 63, 0.26);
}

.nav__burger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-white);
  position: relative;
  transition: background var(--transition-fast);
}

.nav__burger::before,
.nav__burger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition:
    top var(--transition-fast),
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.nav__burger::before {
  top: -7px;
}

.nav__burger::after {
  top: 7px;
}

.nav__toggle.isOpen .nav__burger,
.nav__toggle.active .nav__burger,
.nav-toggle.active .nav__burger {
  background: transparent;
}

.nav__toggle.isOpen .nav__burger::before,
.nav__toggle.active .nav__burger::before,
.nav-toggle.active .nav__burger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav__toggle.isOpen .nav__burger::after,
.nav__toggle.active .nav__burger::after,
.nav-toggle.active .nav__burger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* =========================================================
   MOBILE MENU
========================================================== */
.nav__mobile,
.mobile-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 18px;
  right: 18px;
  padding: 18px;
  background:
    linear-gradient(180deg, rgba(14, 20, 14, 0.98) 0%, rgba(9, 13, 9, 0.98) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

.nav__mobile.isOpen,
.nav__mobile.active,
.mobile-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__mobile {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav__mobileLink,
.mobile-menu__nav a {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 54px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.025);
  color: rgba(255, 255, 255, 0.84);
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.nav__mobileLink:hover,
.nav__mobileLink.active,
.mobile-menu__nav a:hover,
.mobile-menu__nav a.active {
  color: var(--color-white);
  background: rgba(141, 198, 63, 0.08);
  border-color: rgba(141, 198, 63, 0.26);
}

.mobile-menu__cta,
.nav__mobile .btn,
.nav__mobile .btn--cta,
.nav__mobile .btn--ghost {
  justify-content: center;
  min-height: 54px;
  margin-top: 8px;
  border-radius: 0 !important;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav__mobile .btn--cta,
.mobile-menu__cta {
  background: var(--gradient-primary) !important;
  color: #0d130d !important;
  border-color: transparent !important;
}

.nav__mobile .btn--ghost {
  background: transparent !important;
  color: var(--color-white) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
}

.nav__mobile .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.06) !important;
  border-color: rgba(141, 198, 63, 0.24) !important;
}

/* =========================================================
   RESPONSIVE
========================================================== */
@media (max-width: 1200px) {
  .nav__desktop,
  .main-nav {
    gap: 18px;
  }

  .nav__link {
    font-size: 0.74rem;
    letter-spacing: 0.14em;
  }

  .header-phone,
  .nav__desktop .btn--cta {
    padding: 0 16px;
  }
}

@media (max-width: 1024px) {
  .nav__desktop,
  .main-nav {
    gap: 14px;
  }

  .nav__link {
    font-size: 0.72rem;
    letter-spacing: 0.12em;
  }

  .brand__text strong,
  .brand-mark__text strong {
    font-size: 0.94rem;
  }

  .brand__text small,
  .brand-mark__text small {
    font-size: 0.66rem;
    letter-spacing: 0.16em;
  }
}

@media (max-width: 920px) {
  .nav__desktop,
  .main-nav {
    display: none;
  }

  .nav-toggle,
  .nav__toggle {
    display: inline-flex;
  }

  .brand__logo,
  .brand-mark__logo {
    width: 48px;
    height: 48px;
  }
}

@media (max-width: 576px) {
  .main-header,
  .nav {
    padding: 14px 0;
  }

  .main-header.scrolled,
  .nav.isScrolled,
  .nav.scrolled {
    padding: 10px 0;
  }

  .header-shell,
  .nav__inner {
    gap: 14px;
  }

  .brand,
  .brand-mark {
    gap: 10px;
  }

  .brand__logo,
  .brand-mark__logo {
    width: 44px;
    height: 44px;
    font-size: 0.94rem;
  }

  .brand__text strong,
  .brand-mark__text strong {
    font-size: 0.88rem;
  }

  .brand__text small,
  .brand-mark__text small {
    margin-top: 4px;
    font-size: 0.6rem;
    letter-spacing: 0.13em;
  }

  .nav__mobile,
  .mobile-menu {
    left: 14px;
    right: 14px;
    padding: 16px;
  }

  .nav__mobileLink,
  .mobile-menu__nav a {
    min-height: 52px;
    font-size: 0.9rem;
  }
}