/* ────────────────────────────────────────────────
   site-header — sticky nav + burger menu
   ──────────────────────────────────────────────── */

.site-header{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 16px 0;
  background: rgba(10, 9, 8, 0.65);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--line);
  transition: transform .35s var(--ease-out), background .25s;
}

.site-header.is-hidden{
  transform: translateY(-100%);
}

.header-inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 32px;
}
.header-inner > .brand{ justify-self: start; }
.header-inner > .nav-desktop{ justify-self: center; }
.header-inner > .header-actions{ justify-self: end; }

/* brand */
.brand{
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}
.brand-mark{
  width: 38px;
  height: 19px;
  flex-shrink: 0;
}
.brand-mark svg{
  width: 100%;
  height: 100%;
  display: block;
}
/* draw-in animation initial state */
.brand-mark .infinity-path{
  stroke-dasharray: 380;
  stroke-dashoffset: 380;
}
.brand-mark .moment-dot{
  opacity: 0;
}
.brand-name{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
}

/* desktop nav */
.nav-desktop{
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav-desktop a{
  color: var(--ink-dim);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: color .25s;
  position: relative;
}
.nav-desktop a::after{
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--ink);
  transition: width .3s var(--ease-out);
}
.nav-desktop a:hover{ color: var(--ink); }
.nav-desktop a:hover::after{ width: 100%; }

/* right side */
.header-actions{
  display: flex;
  align-items: center;
  gap: 18px;
}
.signin-link{
  color: var(--ink-dim);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: color .25s;
}
.signin-link:hover{ color: var(--ink); }

.cta-primary{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ink);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 100px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: -0.01em;
  border: none;
  cursor: none;
  transition: transform .3s var(--ease-out);
  text-decoration: none;
}
.cta-primary:hover{ transform: translateY(-1px); }
.cta-primary .arrow{ transition: transform .3s; }
.cta-primary:hover .arrow{ transform: translate(2px, -2px); }

/* ────── language switcher (desktop) ────── */
.lang-switcher{
  position: relative;
}
.lang-toggle{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: 100px;
  padding: 6px 12px 6px 6px;
  color: var(--ink-dim);
  cursor: none;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: color .25s, border-color .25s, background .25s;
}
.lang-toggle:hover{
  color: var(--ink);
  border-color: rgba(245,244,242,0.22);
}
.lang-toggle[aria-expanded="true"]{
  color: var(--ink);
  background: rgba(245,244,242,0.04);
  border-color: rgba(245,244,242,0.22);
}
.lang-flag{
  width: 22px; height: 22px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  display: block;
  background: var(--bg-3);
}
.lang-flag img{
  width: 100%; height: 100%;
  display: block;
  border-radius: 50%;
  object-fit: cover;
}
.lang-toggle .lang-code{
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.lang-chev{
  width: 10px; height: 10px;
  margin-left: 1px;
  transition: transform .3s var(--ease-out);
}
.lang-toggle[aria-expanded="true"] .lang-chev{
  transform: rotate(180deg);
}

/* dropdown menu */
.lang-menu{
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 200px;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: 14px;
  padding: 6px;
  z-index: 60;
  list-style: none;
  margin: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity .25s var(--ease-out), transform .25s var(--ease-out);
  box-shadow: 0 16px 48px -12px rgba(0,0,0,0.7);
}
.lang-menu.is-open{
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.lang-option{
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 9px 10px;
  border-radius: 9px;
  background: none;
  border: none;
  width: 100%;
  color: var(--ink-dim);
  cursor: none;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: -0.005em;
  text-align: left;
  transition: background .2s, color .2s;
}
.lang-option:hover{
  background: rgba(245,244,242,0.04);
  color: var(--ink);
}
.lang-option .lang-flag{ width: 24px; height: 24px; }
.lang-option .lang-name{
  flex: 1;
  font-weight: 500;
}
.lang-option .lang-mono{
  font-family: 'Geist Mono', monospace;
  font-size: 10.5px;
  color: var(--ink-mute);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.lang-option.active{
  background: rgba(245,244,242,0.06);
  color: var(--ink);
}
.lang-option.active .lang-mono{ color: var(--ink); }
.lang-option .lang-check{
  width: 12px; height: 12px;
  color: var(--ink);
  opacity: 0;
  flex-shrink: 0;
}
.lang-option.active .lang-check{ opacity: 1; }

/* ────── mobile language row (inside burger overlay) ────── */
.mobile-lang{
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 24px;
  margin-top: -16px;
}
.mobile-lang-label{
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
}
.mobile-lang-row{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.mobile-lang-btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px 10px 8px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--ink-dim);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: none;
  transition: all .25s var(--ease-out);
}
.mobile-lang-btn:hover{
  color: var(--ink);
  border-color: var(--line-2);
}
.mobile-lang-btn.active{
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.mobile-lang-btn .lang-flag{ width: 22px; height: 22px; }

/* burger button */
.burger{
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  position: relative;
  cursor: none;
}
.burger span{
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  border-radius: 2px;
  margin: 0 auto;
  transition: transform .35s var(--ease-out), opacity .2s;
}
.burger span:first-child{ transform: translateY(-3px); }
.burger span:last-child{ transform: translateY(3px); }

.burger.is-open span:first-child{
  transform: translateY(0.5px) rotate(45deg);
}
.burger.is-open span:last-child{
  transform: translateY(-1px) rotate(-45deg);
}

/* ────────── mobile menu overlay ────────── */
.mobile-menu{
  position: fixed;
  inset: 0;
  z-index: 45;
  background: var(--bg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
  transition: opacity .4s var(--ease-out), transform .4s var(--ease-out);
  overflow-y: auto;
}
.mobile-menu.is-open{
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.mobile-menu-inner{
  min-height: 100vh;
  padding: 110px var(--gutter-sm) 48px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.mobile-nav{
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--line);
}
.mobile-nav a{
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
  text-decoration: none;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease-out), transform .5s var(--ease-out);
}
.mobile-nav a .num{
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 400;
}
.mobile-menu.is-open .mobile-nav a{
  opacity: 1;
  transform: translateY(0);
}
.mobile-menu.is-open .mobile-nav a:nth-child(1){ transition-delay: .15s; }
.mobile-menu.is-open .mobile-nav a:nth-child(2){ transition-delay: .21s; }
.mobile-menu.is-open .mobile-nav a:nth-child(3){ transition-delay: .27s; }
.mobile-menu.is-open .mobile-nav a:nth-child(4){ transition-delay: .33s; }
.mobile-menu.is-open .mobile-nav a:nth-child(5){ transition-delay: .39s; }
.mobile-menu.is-open .mobile-nav a:nth-child(6){ transition-delay: .45s; }

.mobile-cta{
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--ink);
  color: var(--bg);
  padding: 18px 24px;
  border-radius: 100px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
  text-decoration: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease-out) .55s, transform .5s var(--ease-out) .55s;
}
.mobile-menu.is-open .mobile-cta{
  opacity: 1;
  transform: translateY(0);
}

/* ────────── responsive ────────── */
@media (max-width: 980px){
  .nav-desktop{ display: none; }
  .signin-link{ display: none; }
  .cta-primary{ display: none; }
  .lang-switcher{ display: none; }
  .burger{ display: flex; }
}

@media (max-width: 620px){
  .site-header{ padding: 14px 0; }
  .brand-mark{ width: 32px; height: 16px; }
  .brand-name{ font-size: 18px; }
}

/* lock body scroll when menu is open */
body.menu-open{
  overflow: hidden;
  height: 100vh;
}