/* =========================================================
   ClimateMesh Header — standalone CSS (no framework required)
   ========================================================= */

:root {
  --header-bg: rgba(2, 6, 23, 0.8);       /* slate-950/80 */
  --header-border: rgba(30, 41, 59, 0.8);  /* slate-800/80 */
  --header-text: #cbd5e1;                  /* slate-300 */
  --header-text-strong: #ffffff;
  --dropdown-bg: #0f172a;                  /* slate-900 */
  --dropdown-border: #334155;              /* slate-700 */
  --dropdown-hover: #1e293b;               /* slate-800 */

  --accent-emerald: #34d399;
  --accent-cyan: #22d3ee;
  --accent-indigo: #818cf8;
  --accent-purple: #c084fc;

  --header-height: 80px;
}

/* ---------- Base header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 11111;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--header-border);
}

.site-header__container {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* ---------- Logo ---------- */
.site-header__logo {
  display: inline-flex;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.site-header__logo:hover {
  transform: scale(1.02);
}
.site-header__logo img {
  height: 3.5rem;
  width: auto;
  object-fit: contain;
}

/* ---------- Desktop nav ---------- */
.site-nav {
  display: none;
  align-items: center;
  gap: 0rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--header-text);
  flex: 1;
  justify-content: center;
}

.nav-link {
  color: var(--header-text);
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover{
  color: var(--accent-emerald) !important;
}

/* ---------- Dropdown (desktop) ---------- */
.nav-dropdown {
  position: relative;
  padding: 0.75rem 0;
}

.nav-dropdown__toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  font: inherit;
  color: var(--header-text);
  cursor: pointer;
  transition: color 0.2s ease;
}
.nav-dropdown__toggle--emerald:hover,
.nav-dropdown__toggle--emerald.is-active { color: var(--accent-emerald); }
.nav-dropdown__toggle--purple:hover,
.nav-dropdown__toggle--purple.is-active { color: var(--accent-emerald); }

.nav-dropdown__arrow {
  width: 1rem;
  height: 1rem;
  transition: transform 0.2s ease;
}
.nav-dropdown.is-open .nav-dropdown__arrow {
  transform: rotate(180deg);
}

.nav-dropdown__menu {
  position: absolute;
  left: 0;
  top: 100%;
  width: 20rem;
  padding-top: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
}
.nav-dropdown.is-open .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown__menu > div,
.nav-dropdown__menu {
  border-radius: 0.75rem;
}

.nav-dropdown__menu {
  background: var(--dropdown-bg);
  border: 1px solid var(--dropdown-border);
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
}

.nav-dropdown__menu a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  color: var(--header-text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.15s ease;
}
.nav-dropdown__menu a:hover {
  background: var(--dropdown-hover);
  color: var(--header-text-strong);
}

/* ---------- Dropdown divider ---------- */
.nav-dropdown__divider,
.mobile-nav__accordion-panel hr {
  border: none;
  border-top: 1px solid var(--dropdown-border);
  margin: 0.25rem 0;
}

/* ---------- User account dropdown ---------- */
.nav-dropdown--user {
  padding: 0.5rem 0;
  flex-shrink: 0;
}
.nav-dropdown__toggle--user {
  padding: 0;
  line-height: 0;
  border-radius: 9999px;
  transition: box-shadow 0.2s ease;
}
.nav-dropdown__toggle--user:hover,
.nav-dropdown__toggle--user.is-active {
  box-shadow: 0 0 0 2px var(--accent-emerald);
}
.nav-dropdown__toggle--user img {
  display: block;
  border-radius: 9999px;
}

.nav-dropdown__menu--user {
  left: auto;
  right: 0;
  width: 15rem;
}

.nav-dropdown__menu--user a {
  border-bottom: 1px solid var(--dropdown-border);
}
.nav-dropdown__menu--user a:last-child,
.nav-dropdown__menu--user form:last-child a {
  border-bottom: none;
}
.nav-dropdown__user-name {
  font-weight: 700;
  color: var(--header-text-strong) !important;
  text-transform: capitalize;
}

/* Sign-in button reuses the CTA look but sits after it isn't shown */
.site-header__cta--signin {
  flex-shrink: 0;
}

/* ---------- CTA button (desktop) ---------- */
.site-header__cta {
  display: none;
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.site-header__cta:hover {
  background: rgba(16, 185, 129, 0.18);
  color: #fff !important;
  border: 1px solid #fff;
  text-decoration: none;
}

/* ---------- Hamburger (mobile) ---------- */
.site-header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.site-header__hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--header-text-strong);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.site-header__hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}
.site-header__hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Mobile nav panel ---------- */
.mobile-nav {
  max-height: 0;
  overflow: hidden;
  background: var(--dropdown-bg);
  border-top: 1px solid transparent;
  transition: max-height 0.3s ease, border-color 0.3s ease;
}
.mobile-nav.is-open {
  max-height: 32rem;
  overflow-y: auto;
  border-top-color: var(--header-border);
}

.mobile-nav nav {
  display: flex;
  flex-direction: column;
  padding: 0.5rem 1rem 1.5rem;
}

.mobile-nav__link {
  padding: 0.9rem 0.5rem;
  color: var(--header-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}
.mobile-nav__link:hover {
  color: var(--header-text-strong);
}

.mobile-nav__cta {
  margin-top: 1rem;
  text-align: center;
  padding: 0.75rem 1rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  text-decoration: none;
}

/* Mobile accordions */
.mobile-nav__accordion {
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}
.mobile-nav__accordion-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  padding: 0.9rem 0.5rem;
  color: var(--header-text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}
.mobile-nav__accordion-toggle svg {
  width: 1rem;
  height: 1rem;
  transition: transform 0.2s ease;
}
.mobile-nav__accordion.is-open .mobile-nav__accordion-toggle svg {
  transform: rotate(180deg);
}
.mobile-nav__accordion.is-open .mobile-nav__accordion-toggle {
  color: var(--header-text-strong);
}

.mobile-nav__accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.mobile-nav__accordion.is-open .mobile-nav__accordion-panel {
  max-height: 20rem;
}

.mobile-nav__accordion-panel a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.5rem 0.65rem 1.25rem;
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.875rem;
}
.mobile-nav__accordion-panel a:hover {
  color: var(--header-text-strong);
}
.mobile-nav__accordion-panel form {
  margin: 0;
}

/* =========================================================
   Breakpoint — switch between mobile / desktop nav at 768px
   ========================================================= */
@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }
  .site-header__cta {
    display: inline-block;
  }
  .site-header__hamburger,
  .mobile-nav {
    display: none;
  }
}