/* Top bar: logo, nav, contact, hamburger */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--navbar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
}

.header-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s ease, transform 0.2s ease;
  flex: 0 0 auto;
}
.header-logo:hover {
  color: var(--color-accent);
  transform: translateY(-1px);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 0 0 auto;
  margin-left: auto;
}

.header-contact {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
  transition: color 0.2s ease;
}
.header-contact:hover {
  color: var(--color-accent);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-accent);
}
.theme-toggle:active {
  transform: scale(0.98);
}
.theme-toggle-icon {
  display: block;
}

[data-theme="light"] .theme-toggle:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-accent);
}
.nav-toggle:active {
  transform: scale(0.98);
}

.hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Nav: collapsible menu (mobile) */
.navbar {
  width: 100%;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  order: 10;
}
.navbar.navbar-open {
  max-height: 320px;
  transition: max-height 0.4s ease-in;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: var(--space-sm) 0 var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.nav-list li {
  margin: 0;
}

.navbar button {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  font-size: 1rem;
  color: var(--color-text-muted);
  cursor: pointer;
  position: relative;
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  min-height: 44px;
}
.navbar button:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}
.navbar button.active {
  color: var(--color-accent);
  background: rgba(34, 211, 238, 0.1);
}

[data-theme="light"] .navbar button:hover {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .navbar button.active {
  background: rgba(224, 120, 45, 0.12);
}

.nav-resume {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  margin-top: var(--space-xs);
}

/* Desktop: inline nav, hide hamburger */
@media (min-width: 768px) {
  .site-header {
    flex-wrap: nowrap;
    padding: var(--space-sm) var(--space-lg);
  }

  .header-right {
    margin-left: 0;
  }

  .header-contact {
    max-width: none;
  }

  .nav-toggle {
    display: none;
  }

  .navbar {
    width: auto;
    max-height: none;
    overflow: visible;
    order: 0;
    flex: 1 1 auto;
    display: flex;
    justify-content: center;
  }

  .navbar.navbar-open {
    max-height: none;
  }

  .nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
    gap: var(--space-xs);
    justify-content: center;
    align-items: center;
  }

  .navbar button {
    width: auto;
    min-height: 44px;
    padding: var(--space-xs) var(--space-sm);
    text-align: center;
  }

  .nav-resume {
    width: auto;
    margin-top: 0;
    margin-left: var(--space-sm);
  }
}