#mainNav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    width: min(900px, calc(100% - 40px));
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 0 28px;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s, border-color 0.3s, background 0.3s;
}

[data-theme="dark"] #mainNav {
    background: rgba(15, 23, 42, 0.85);
}

#mainNav.scrolled {
    box-shadow: var(--shadow-md);
    border-color: rgba(59, 130, 246, 0.2);
}

.nav-brand {
    font-family: var(--mono), sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
}

.nav-links li {
    display: flex;
    align-items: center;
}

.nav-links a {
    font-family: var(--sans), sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 30px;
    border: 1px solid transparent;
    transition: color 0.25s, border-color 0.25s, background 0.25s;
}

.nav-links a:hover {
    color: var(--text-primary);
    border-color: var(--border-color);
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .nav-links a:hover {
    background: rgba(255, 255, 255, 0.05);
}

.nav-links a.active {
    color: var(--accent);
    border-color: rgba(59, 130, 246, 0.2);
    background: rgba(59, 130, 246, 0.08);
}

.nav-cta {
    font-family: var(--mono), sans-serif;
    font-size: 0.8rem;
    background: var(--accent) !important;
    color: #fff !important;
    border: none !important;
    padding: 9px 20px !important;
    transition: background 0.25s, box-shadow 0.25s !important;
}

.nav-cta:hover {
    background: var(--accent-hover) !important;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3) !important;
}

.nav-cta.active {
    background: var(--accent-hover) !important;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 38px;
    height: 38px;
    color: var(--text-primary);
    font-size: 1.05rem;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 38px;
    height: 38px;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    transition: border-color 0.2s;
    align-items: center;
    justify-content: center;
}

.nav-toggle:hover {
    border-color: var(--accent);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: calc(var(--nav-h) + 28px);
    left: 50%;
    transform: translateX(-50%);
    width: min(900px, calc(100% - 40px));
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 20px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-md);
    transition: background 0.3s;
}

[data-theme="dark"] .mobile-menu {
    background: rgba(15, 23, 42, 0.96);
}

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

.mobile-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 12px 16px;
    border-radius: 10px;
    transition: background 0.2s, color 0.2s;
}

.mobile-menu a:hover {
    background: rgba(59, 130, 246, 0.08);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }
}