/* ========================================
   HEADER COMPONENT STYLES
======================================== */

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  z-index: 100;
  height: auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 0.9rem 1.25rem 0;
  pointer-events: none;
  transition: padding 0.24s ease;
}

header > * {
  pointer-events: auto;
}

.header-title {
  opacity: 0;
  transform: translateY(-0.625rem);
  transition: opacity 0.22s ease, transform 0.22s ease, color 0.2s ease;
  pointer-events: none;
  font-family: var(--font-heading);
  font-size: var(--font-size-body);
  font-weight: 400;
  color: var(--text-color);
  margin: 0;
  letter-spacing: 0.03125rem;
  cursor: pointer;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-surface);
  border: 0.0625rem solid var(--surface-border);
  background: var(--surface-1);
  backdrop-filter: blur(var(--surface-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--surface-blur)) saturate(160%);
  box-shadow: var(--elevation-surface);
}

.header-title.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.header-title:hover {
  color: var(--text-color);
  transform: translateY(0) scale(1.03);
}

.header-title:active {
  transform: translateY(0) scale(0.98);
}

.menu-toggle {
  background: var(--surface-1);
  border: 0.0625rem solid var(--surface-border);
  border-radius: 50%;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  gap: 0.22rem;
  transition: transform 0.24s ease, border-color 0.2s ease, background-color 0.2s ease;
  outline: none;
  position: relative;
  backdrop-filter: blur(var(--surface-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--surface-blur)) saturate(160%);
  box-shadow: var(--elevation-surface);
  will-change: transform;
}

.menu-toggle:hover {
  transform: translateY(-0.0625rem);
  border-color: var(--surface-border);
}

.menu-toggle:focus-visible {
  outline: none;
  border-color: var(--surface-border);
}

.menu-toggle:active,
.menu-toggle.active,
.menu-toggle.active:hover {
  border-color: var(--surface-border);
}

.menu-toggle.active {
  transform: rotate(90deg);
}

.hamburger-line {
  width: 1.25rem;
  height: 0.125rem;
  background-color: var(--text-color);
  border-radius: 0.0625rem;
  transition: transform 0.24s ease, opacity 0.2s ease, background-color 0.2s ease;
  transform-origin: center;
  position: relative;
}

.menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg);
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -0.625rem;
  margin-top: -0.0625rem;
}

.menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg);
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -0.625rem;
  margin-top: -0.0625rem;
}