.header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    height: var(--header-height);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 1100;
    backdrop-filter: blur(16px) saturate(1.3);
    -webkit-backdrop-filter: blur(16px) saturate(1.3);
    background: rgba(var(--bg-rgb, 255, 255, 255), 0.82);
    transition: background var(--transition), border var(--transition), box-shadow var(--transition);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}
[data-theme="dark"] .header {
    background: rgba(18, 18, 18, 0.85);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}
.header.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
}
[data-theme="dark"] .header.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    transition: transform var(--transition);
}
.logo-icon:hover {
    transform: scale(1.06) rotate(-3deg);
}
.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    font-family: var(--font-family);
    white-space: nowrap;
    letter-spacing: -0.02em;
}
.logo-text .version {
    font-size: 0.7rem;
    font-weight: 300;
    background: var(--primary);
    color: var(--bg);
    padding: 1px 10px;
    border-radius: 20px;
    margin-right: 4px;
    transition: background var(--transition), color var(--transition);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.header-actions .theme-toggle,
.header-actions .lang-toggle {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 5px 16px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text);
    transition: all var(--transition);
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    user-select: none;
}
.header-actions .theme-toggle:hover,
.header-actions .lang-toggle:hover {
    background: var(--border);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.header-actions .theme-toggle:active,
.header-actions .lang-toggle:active {
    transform: scale(0.94);
}
.header-actions .github-link {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: var(--bg);
    padding: 5px 16px;
    border-radius: 30px;
    font-weight: 500;
    font-size: 0.8rem;
    transition: all var(--transition);
    font-family: var(--font-family);
    white-space: nowrap;
}
.header-actions .github-link:hover {
    background: var(--primary-hover);
    text-decoration: none;
    color: var(--bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}
.header-actions .github-link:active {
    transform: scale(0.94);
}
.menu-toggle {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 8px 12px;
    cursor: pointer;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 44px;
    height: 44px;
    transition: all var(--transition);
    user-select: none;
    position: relative;
}
.menu-toggle:hover {
    background: var(--border);
}
.menu-toggle:active {
    transform: scale(0.92);
}
.hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 4px;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}
.menu-toggle.open .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.menu-toggle.open .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.menu-toggle.open .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}
.desktop-only {
    display: flex;
}
.mobile-only {
    display: none;
}
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 1050;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.layout {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px 40px;
    gap: 30px;
    position: relative;
}