.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background-color: var(--color-bg-page);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--motion-duration-fast) var(--motion-ease),
              border-color var(--motion-duration-fast) var(--motion-ease);
}

@supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
  .site-header {
    background-color: color-mix(in srgb, var(--color-bg-page) 88%, transparent);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }
}

.site-header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  box-sizing: border-box;
  min-height: 74px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  min-height: 48px;
  color: var(--color-text-primary);
  justify-self: start;
}

.site-brand-avatar-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.site-brand-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 1.5px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: border-color var(--motion-duration-fast) var(--motion-ease),
              transform var(--motion-duration-fast) var(--motion-ease);
}

.site-brand:hover .site-brand-avatar {
  border-color: var(--color-accent);
  transform: scale(1.04);
}

.status-pulse-dot {
  position: absolute;
  bottom: 0;
  right: -1px;
  width: 11px;
  height: 11px;
  border-radius: var(--radius-full);
  background-color: #10b981;
  border: 2px solid var(--color-bg-page);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseBeacon 2.2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulseBeacon {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.25;
}

.site-brand-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  transition: color var(--motion-duration-fast) var(--motion-ease);
}

.site-brand:hover .site-brand-name {
  color: var(--color-accent);
}

.site-brand-title {
  display: none;
}

.site-brand:focus-visible,.site-nav-link:focus-visible,.theme-toggle-btn:focus-visible,.menu-toggle-btn:focus-visible,.header-icon-btn:focus-visible,.header-resume-btn:focus-visible{border-radius:var(--radius-sm)}

.site-nav {
  justify-self: center;
  display: flex;
  justify-content: center;
}

.site-nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding-inline: var(--space-3);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  position: relative;
  border-radius: var(--radius-sm);
  transition: color var(--motion-duration-fast) var(--motion-ease),
              background-color var(--motion-duration-fast) var(--motion-ease),
              transform var(--motion-duration-fast) var(--motion-ease);
}

@media (hover: hover) and (pointer: fine) {
  .site-nav-link:hover {
    color: var(--color-accent);
    background-color: var(--color-bg-surface-hover);
    transform: translateY(-1px);
  }
}

.site-nav-link[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 650;
}

.site-nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: var(--space-2);
  right: var(--space-2);
  height: 2px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
  box-shadow: 0 0 8px var(--color-accent);
}

.site-header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  justify-self: end;
}

.header-icon-btn,
.header-resume-btn,
.theme-toggle-btn,
.menu-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  text-decoration: none;
  box-sizing: border-box;
  transition: all var(--motion-duration-fast) var(--motion-ease);
}

.header-icon-btn:hover,
.header-resume-btn:hover,
.theme-toggle-btn:hover,
.menu-toggle-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-bg-surface-hover);
}

.header-icon-btn {
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
}

.header-resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  min-height: 44px;
  padding: 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.theme-toggle-btn,
.menu-toggle-btn {
  min-width: 44px;
  min-height: 44px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  padding: 0;
}

.theme-toggle-label {
  display: none;
}

.theme-icon-sun,
.theme-icon-moon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  transition: transform var(--motion-duration-fast) var(--motion-ease);
}

.theme-toggle-btn:hover .theme-icon-sun,
.theme-toggle-btn:hover .theme-icon-moon {
  transform: rotate(15deg);
}

:root:not([data-theme="light"]) .theme-icon-moon,
[data-theme="light"] .theme-icon-sun {
  display: none !important;
}

:root:not([data-theme="light"]) .theme-icon-sun,
[data-theme="light"] .theme-icon-moon {
  display: inline-block;
  color: var(--color-accent);
}

.menu-toggle-btn {
  display: none;
  padding: var(--space-2);
}

.site-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background-color: rgba(9, 13, 22, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 90;
  cursor: pointer;
}

.site-nav-backdrop.is-open {
  display: block;
}

body.menu-open {
  overflow: hidden;
}

.menu-icon-close,
.site-nav-arrow,
.site-nav-mobile-footer {
  display: none;
}

.menu-toggle-btn.is-active .menu-icon-bars {
  display: none;
}

.menu-toggle-btn.is-active .menu-icon-close {
  display: block;
}

@media (max-width: 1024px) {
  .menu-toggle-btn {
    display: inline-flex;
  }
  .header-icon-btn,
  .header-resume-btn {
    display: none;
  }
  .site-header-inner {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
    padding: var(--space-2) var(--gutter);
  }
  .site-brand {
    flex: 0 1 auto;
  }
  .site-brand-avatar {
    width: 38px;
    height: 38px;
  }
  .site-brand-name {
    font-size: 1.15rem;
  }
  .site-header-actions {
    flex: 0 0 auto;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: var(--gutter);
    left: auto;
    width: 240px;
    max-width: calc(100vw - (var(--gutter) * 2));
    background-color: var(--color-bg-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    box-shadow: 0 20px 48px -4px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.08);
    z-index: 100;
    transform-origin: top right;
  }
  .site-nav::before {
    content: "";
    position: absolute;
    top: -7px;
    right: 16px;
    width: 12px;
    height: 12px;
    background-color: var(--color-bg-surface-elevated);
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
    transform: rotate(45deg);
    z-index: 1;
    pointer-events: none;
  }
  .site-nav.is-open {
    display: block;
    animation: menuDropdownOpen var(--motion-duration-fast) var(--motion-ease);
  }
  @keyframes menuDropdownOpen {
    from { opacity: 0; transform: scale(0.95) translateY(-8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
  }
  .site-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    width: 100%;
  }
  .site-nav-link {
    width: 100%;
    min-height: 48px;
    padding: var(--space-2) var(--space-3);
    font-size: 1.05rem;
    font-weight: 550;
    border-radius: var(--radius-md);
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: transparent;
    border-bottom: none;
    transition: background-color var(--motion-duration-fast) var(--motion-ease),
                color var(--motion-duration-fast) var(--motion-ease);
  }
  .site-nav-link:hover,
  .site-nav-link:active {
    background-color: var(--color-bg-surface-hover);
    color: var(--color-text-primary);
  }
  .site-nav-link[aria-current="page"] {
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    font-weight: 700;
  }
  .site-nav-link[aria-current="page"]::after {
    display: none;
  }
  .site-nav-arrow {
    display: inline-block;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    line-height: 1;
    transition: transform var(--motion-duration-fast) var(--motion-ease);
  }
  .site-nav-link:hover .site-nav-arrow,
  .site-nav-link[aria-current="page"] .site-nav-arrow {
    color: var(--color-accent);
    transform: translateX(3px);
  }
  .site-nav-mobile-footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border-subtle);
  }
}