/* Shared SMS header. Keep this in sync with the approved root index header. */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h, 68px);
  background: rgba(12, 12, 15, .85);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border, #1e1e2e);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  z-index: 100;
  gap: 2.2rem;
}

.main-nav .nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}

.main-nav .nav-links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--text, #e2e8f0);
  text-decoration: none;
  letter-spacing: .03em;
  transition: color .2s;
}

.main-nav .nav-links a:hover,
.main-nav .nav-links a.active {
  color: var(--accent, #6ee7b7);
}

.main-nav .nav-actions {
  position: absolute;
  right: clamp(1.5rem, 5vw, 4rem);
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  z-index: 2;
  min-width: max-content;
  white-space: nowrap;
}

.main-nav .nav-logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -.02em;
  color: var(--text, #e2e8f0);
  text-decoration: none;
  margin-right: auto;
  position: absolute;
  left: clamp(1.5rem, 5vw, 4rem);
}

.main-nav .nav-logo span {
  color: var(--accent, #6ee7b7);
}

.main-nav .nav-github {
  position: static;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text, #e2e8f0);
  text-decoration: none;
  border: 1px solid var(--text, #e2e8f0);
  padding: .4rem .9rem;
  border-radius: 8px;
  transition: border-color .2s, color .2s;
}

.main-nav .nav-github:hover {
  border-color: var(--accent, #6ee7b7);
  color: var(--accent, #6ee7b7);
}

.main-nav .nav-github svg {
  width: 15px;
  height: 15px;
}

.language-switch,
.mobile-menu .language-switch {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  min-width: 4.6rem;
  min-height: 1.9rem;
  padding: 0;
  border: 1px solid rgba(226, 232, 240, .28);
  border-radius: 999px;
  background: transparent;
  color: var(--muted, #6f7e96);
  font-family: 'DM Sans', sans-serif;
  font-size: .67rem;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1;
  cursor: pointer;
  overflow: hidden;
  box-shadow: none;
  transition: background .2s, border-color .2s, color .2s;
}

.main-nav .language-switch {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  pointer-events: auto;
}

.language-switch:hover,
.language-switch:focus-visible {
  border-color: var(--accent, #6ee7b7);
  background: rgba(110, 231, 183, .06);
  color: var(--text, #e2e8f0);
  outline: none;
}

.language-switch:focus-visible {
  outline: 2px solid var(--accent, #6ee7b7);
  outline-offset: 2px;
}

.language-switch .language-option {
  flex: 1 1 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 1.9rem;
  padding: .2rem .27rem;
  color: var(--muted, #6f7e96);
  transition: background .2s, color .2s;
}

.language-switch .language-option + .language-option {
  border-left: 1px solid var(--border, #1e1e2e);
}

.language-switch .language-option-active {
  background: var(--accent, #6ee7b7);
  color: #0c0c0f;
  font-weight: 800;
}

.language-switch .language-separator {
  display: none;
}

.mobile-menu .language-switch {
  margin: .1rem 0 0;
}

.nav-toggle {
  display: none;
  position: absolute;
  right: clamp(1.5rem, 5vw, 4rem);
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--border, #1e1e2e);
  border-radius: 8px;
  cursor: pointer;
  z-index: 101;
  transition: border-color .2s;
}

.nav-toggle:hover {
  border-color: var(--accent, #6ee7b7);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text, #e2e8f0);
  border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h, 68px);
  left: 0;
  right: 0;
  background: rgba(12, 12, 15, .98);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border, #1e1e2e);
  z-index: 102;
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}

.mobile-menu.open {
  max-height: calc(100vh - var(--nav-h, 68px));
  overflow-y: auto;
}

.mobile-menu ul {
  list-style: none;
  padding: .4rem 1.5rem 1.4rem;
}

.mobile-menu li + li {
  border-top: 1px solid var(--border, #1e1e2e);
}

.mobile-menu a {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .95rem .2rem;
  color: var(--text, #e2e8f0);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color .2s;
}

.mobile-menu a:hover { color: var(--accent, #6ee7b7); }
.mobile-menu .mobile-section { color: var(--muted, #6f7e96); }
.mobile-menu .mobile-section:hover { color: var(--accent, #6ee7b7); }
.mobile-menu .mobile-github { color: var(--accent, #6ee7b7); }
.mobile-menu .mobile-github svg { width: 17px; height: 17px; }

.mobile-language-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .4rem;
  margin: .45rem 0 .55rem;
  padding: .7rem .2rem .75rem;
  border-top: 1px solid var(--border, #1e1e2e);
  border-bottom: 1px solid var(--border, #1e1e2e);
}

.mobile-language-label,
.mobile-menu .mobile-menu-label {
  color: var(--muted, #6f7e96);
  font-size: .68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .14em;
}

.mobile-menu .mobile-menu-label {
  padding: 1rem .2rem .35rem;
  border-top: none;
}

@media (max-width: 960px) {
  .main-nav {
    justify-content: flex-start;
    padding: 0 1.5rem;
  }

  .main-nav .nav-links,
  .main-nav .nav-actions {
    display: none;
  }

  .main-nav .nav-logo {
    position: static;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}