.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.main-header.scrolled {
    height: 70px;
    background: rgba(10, 10, 15, 0.98);
    box-shadow: var(--shadow-lg);
}

.header-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 200px;
    background: radial-gradient(ellipse at center, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.header-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: 45px;
    height: 45px;
    animation: float 3s ease-in-out infinite;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 10px var(--primary-glow));
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 2px;
}

.logo-tagline {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-tertiary);
    letter-spacing: 4px;
    text-transform: uppercase;
}

.logo-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
    padding: 0.3rem 0.8rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-full);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-text {
    font-size: 0.75rem;
    color: var(--success);
    font-weight: 500;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
    border-color: var(--primary);
    background: rgba(220, 38, 38, 0.1);
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
    margin: 0 2rem;
}

.nav-scroll-container {
    overflow-x: auto;
    scrollbar-width: none;
}

.nav-scroll-container::-webkit-scrollbar {
    display: none;
}

.nav-list {
    display: flex;
    gap: 0.5rem;
}

.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-item:hover {
    background: var(--bg-card);
    border-color: var(--border-color);
}

.nav-item.active {
    background: var(--primary);
    border-color: var(--primary);
}

.nav-item.active .nav-icon svg {
    stroke: white;
}

.nav-item.active span {
    color: white;
}

.nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--text-secondary);
    transition: stroke var(--transition-fast);
}

.nav-item:hover .nav-icon svg {
    stroke: var(--primary);
}

.nav-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.nav-item:hover span {
    color: var(--text-primary);
}

.nav-indicator {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 30px;
    height: 3px;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast);
}

.nav-item:hover .nav-indicator,
.nav-item.active .nav-indicator {
    transform: translateX(-50%) scaleX(1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.action-btn {
    position: relative;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.action-btn svg {
    width: 20px;
    height: 20px;
}

.moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}

@media (max-width: 1200px) {
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        padding: 1rem;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
        transform: translateY(-100%);
        transition: transform var(--transition-base);
        z-index: calc(var(--z-sticky) - 1);
        border-bottom: 1px solid var(--border-color);
    }

    .main-nav.active {
        transform: translateY(var(--header-height));
        z-index: var(--z-modal);
    }

    .nav-scroll-container {
        overflow-x: visible;
        height: 100%;
    }

    .nav-list {
        flex-wrap: wrap;
        gap: 0.5rem;
        justify-content: center;
    }

    .nav-item {
        padding: 0.5rem 1rem;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        font-size: 0.85rem;
    }

    .nav-item:hover {
        background: var(--primary);
        border-color: var(--primary);
        color: white;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .logo-status {
        display: none;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
    }

    .logo-name {
        font-size: 1.2rem;
    }

    .logo-tagline {
        display: none;
    }

    .action-btn {
        width: 40px;
        height: 40px;
    }
}